JP2000004305A - On-vehicle information device communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform communication between the two, without newly arranging a signal line while maintaining the portability of a portable information terminal and the convenience on an operation of connection, etc. SOLUTION: This device is provided with a portable information terminal 11 and a communication device 12, which are mounted on a vehicle 10 and mutually perform data communication, a power line 16 to which power supply 18 is connected and a cigarette lighter plug 15 which connects the terminal 11 and the device 12. Here, an interface circuit 14 which is respectively provided in the terminal 11 and the device 12 is connected to the line 16, outputs a communication signal for data communication to the other communication party through the line 16 and also inputs a communication signal from the other communication party through the line 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable information terminal to which power is supplied from a cigarette lighter plug, a communication device, and a vehicle information device for communicating with a vehicle information communication device connected to a vehicle power line. The present invention relates to a device communication device, and in particular, to a vehicle information device communication capable of performing communication between a portable information terminal and a communication device without arranging a new signal line, while maintaining portability and easy operation such as connection. Related to the device.

[0002]

2. Description of the Related Art Conventionally, a vehicle is equipped with a vehicle information device communication device, and the vehicle information device communication device includes a PDA (Personal Digital As).
A portable information terminal such as a mobile phone (communications equipment), a communication device such as a car phone, and a vehicle-mounted information communication device such as a car navigation system, various sensors, and a tuner are provided.
When communication is performed between the portable information terminal, the communication device, and the in-vehicle information communication device, a signal line such as a copper wire or an optical fiber is routed as a dedicated transmission path.

FIG. 4 shows a transmission line configuration of a conventional vehicle information device communication device mounted on a vehicle. In FIG. 4, the vehicle is equipped with a portable information terminal 101, a communication device 102, and an in-vehicle information communication device 103.
1 and the in-vehicle information communication device 103 are connected by a dedicated signal line 104, and the portable information terminal 101 and the communication device 102 are connected by a signal line 105.

[0006] Here, a transmitting device for transmitting data is, for example, a portable information terminal 101, and a receiving device for receiving data is, for example, an on-board information communication device 103. The transmitting device 101 modulates data into a signal according to a predetermined protocol by an interface circuit 106 built in the transmitting device 101, and converts the modulated signal to a signal line 10.
4

The transmitted signal is transmitted using the signal line 104 as a medium, and the receiving device 10 connected to the signal line 104
3 is received by the interface circuit 106 built in the IC card 3. The interface circuit 106 demodulates data from the received signal in accordance with a predetermined protocol, and transmits the demodulated data to the receiving device 103.

[0006] Each of the devices 101 to 103 has a built-in stabilized power supply circuit 107 to which a vehicle-mounted power supply line 108 is individually connected via a cigarette lighter plug 109 or directly.

The stabilized power supply circuit 107 is supplied with power from a vehicle-mounted battery 110 via a vehicle-mounted power supply line 108.
The supplied power supply voltage is converted into an appropriate voltage, smoothed, and supplied to each of the devices 101 to 103.

FIG. 5 is a block diagram showing a configuration of a portable information terminal 101 which is an example of a device provided in a conventional vehicle information device communication device. In FIG. 5, the portable information terminal body 12
1, and each interface circuit 106a, 106b
Are supplied with power from a stabilized power supply circuit 107 via a power supply line 123.

Further, the stabilized power supply circuit 107
25 and the vehicle power supply line 108 via the cigarette lighter plug 109 to supply power. The interface circuits 106a and 106b are connected to the portable information terminal main body 121 via the internal signal line 127,
4 and 105, it is connected to an external device (not shown) as a data transmission / reception destination.

When transmitting data from portable information terminal 101, first, data is transmitted from portable information terminal main body 121 to interface circuit 106 via internal signal line 127.

Interface circuits 106a, 106b
Modulates the received data into a signal according to a predetermined protocol, and converts the modulated signal to signal lines 104 and 10.
5 to an external device. In addition, the portable information terminal 1
When 01 receives data, it receives data from an external device according to a procedure reverse to the procedure described above.

As described above, the portable information terminal 101 and the communication device 102 mounted on the vehicle, and the vehicle-mounted information communication device 10
When communication is performed with the communication line 3, the signal lines 104 and 105 need to be routed as dedicated transmission lines.

[0013]

However, in order to establish a transmission path for the portable information terminal, a plurality of wirings such as a power supply line and a signal line must be provided to the portable information terminal each time communication is performed. This impairs the portability of the portable information terminal and the simplicity of operation such as connection.

Further, in order to mount the equipment constituting such a transmission path on an existing vehicle, a new signal line has to be routed. It took quite a while.

On the other hand, as a related technology of this type of conventional vehicle information device communication device, for example, Japanese Patent Application Laid-Open No. Hei 4-3315 is known.
Japanese Patent Application Laid-Open Publication No. 40 and Japanese Unexamined Utility Model Publication No. Hei 5-48277 are known.

In the radio telephone apparatus disclosed in Japanese Unexamined Patent Publication No. 4-331540, one end of a cable is connected to the main body of the radio telephone apparatus, and a plug connected to the other end of the cable is connected to a driver inside the automobile. The microphone unit is connected to a cigarette lighter socket installed near the seat, and a plug is integrated with a microphone unit connected to the wireless telephone device body by a cable.

According to this, it is possible to improve the installation workability by eliminating the wiring work of the microphone cable, and to prevent the driving operation from being obstructed.

An on-vehicle adapter described in Japanese Utility Model Laid-Open Publication No. 5-48277 has a main body having a power supply control unit such as a DC-DC converter, and a main body protruding from the main body and inserted into a cigar lighter of an automobile. A plug portion to be connected, a connection cord extending from the main body and to be connected to an electronic device such as a portable CD player, and an audio signal output terminal provided on the main body.

The connection cord is composed of a first cord and a second cord. The first cord is connected to the power supply control unit in the main body, and is connected to the external power supply input jack of the electronic device at the tip. A second plug connected to the audio signal output terminal in the main body, and a signal plug to be connected to an external audio output terminal of the electronic device at the end.

According to this, power supply and signal transmission are performed with respect to an electronic device such as a CD player by using a single connection cord composed of the first cord and the second cord.
Simple wiring makes handling easy.

However, the wireless telephone apparatus for a vehicle described in Japanese Patent Application Laid-Open No. Hei 4-331540 and the vehicle-mounted adapter described in Japanese Utility Model Application Laid-Open No. Hei 5-48277 disclose the portable information terminal described above. It did not improve the portability and simplicity of operation such as connection, or the man-hours related to equipment installation by arranging signal lines.

According to the present invention, when communication is performed between a portable information terminal, a communication device, and a vehicle-mounted information communication device mounted on a vehicle, the portability of the portable information terminal and the simplicity of operation such as connection are improved. It is an object of the present invention to provide a vehicular information device communication device that can perform communication between the two without holding a new signal line while holding the communication device.

[0023]

The present invention has the following features to attain the object mentioned above. The invention of claim 1 is
A portable information terminal and a first communication device mounted on a vehicle and performing data communication between each other, a power supply line connected to a power supply,
A connection connector for connecting the power supply line to the portable information terminal and the first communication device, each of the portable information terminal and the first communication device being connected to the power supply line, and An input / output means for outputting a communication signal for the data communication to the communication partner via the power supply line and inputting a communication signal from the communication partner via the power supply line is provided.

According to the first aspect of the present invention, the input / output means provided in each of the portable information terminal and the first communication device is connected to the power supply line. A signal is output to a communication partner via a power supply line, and a communication signal from the communication partner via the power supply line is input.

That is, a transmission path between the portable information terminal and the first communication device can be formed via the power supply line and the connection connector, and the power supply to the portable information terminal and the first communication device at the same time. A supply can also be made. Thus, communication between the portable information terminals can be performed while maintaining portability and operation simplicity such as connection. In addition, by using a general cigarette lighter plug as the connection connector, the versatility of the device can be increased.

According to a second aspect of the present invention, there is provided a second communication device connected to the power supply line and performing data communication with the portable information terminal or the first communication device.
Is characterized by comprising the input / output means.

According to the second aspect of the present invention, since the second communication device includes the input / output means, it can perform data communication with the portable information terminal or the first communication device via the power line. Further, since communication between the devices can be performed without newly arranging a signal line or attaching a connection connector, man-hours related to device installation can be improved.

According to a third aspect of the present invention, the input / output means uses a small-amplitude signal that does not affect the communication partner device connected to the power supply line as the communication signal as the communication signal. Is transmitted to the user.

According to the third aspect of the present invention, the input / output means includes:
Since a small-amplitude signal that does not affect all devices except the communication partner connected to the power line is transmitted to the power line as a communication signal, there is no problem for all devices except the communication partner. Will not give.

According to a fourth aspect of the present invention, the input / output means includes a plurality of interface circuits provided corresponding to a plurality of communication signals, and a common signal line for connecting each interface circuit to the power supply line. And characterized in that:

According to the fourth aspect of the present invention, the communication signal from each interface circuit can be transmitted to the power supply line via the common signal line, so that even when a plurality of communication signals are transmitted and received, Only one common signal line is required.

According to a fifth aspect of the present invention, each of the interface circuits has a unique protocol different from each other, modulates the communication signal into a signal according to the unique protocol, and sends the signal to the power supply line. It is characterized by.

According to the fifth aspect of the present invention, since each interface circuit modulates a communication signal into a signal according to a specific protocol and transmits the signal to the power supply line, a plurality of communication signals perform communication without mutual interference. I can do it.

According to a sixth aspect of the present invention, each of the interface circuits includes a generating means for generating a pseudo noise sequence,
A modulation means for calculating a pseudo-noise sequence generated by the generation means and the communication signal to perform spread modulation, and sending out the obtained spread modulation output to the power supply line.

According to the sixth aspect of the present invention, the modulating means performs spread modulation by calculating the pseudo noise sequence generated by the generating means and the communication signal, and sends the obtained spread modulated output to the power supply line. , Other communication signals can be eliminated as noise.

According to a seventh aspect of the present invention, each of the interface circuits includes a generating means for generating a pseudo noise sequence,
Demodulating means for despread demodulating the communication signal from a received signal received from the power supply line using a pseudo noise sequence generated by the generating means.

According to the seventh aspect of the present invention, the demodulation means despreads and demodulates the communication signal from the reception signal received from the power supply line using the pseudo noise sequence generated by the generation means. It is possible to demodulate the communication signal without performing.

[0038]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a communication device for a vehicle information device according to the present invention.

(Schematic Configuration of Vehicle Information Equipment Communication Apparatus) FIG. 1 shows a transmission line configuration of a vehicle information equipment communication apparatus according to an embodiment of the present invention. The vehicle information device communication device is mounted on a vehicle such as an automobile, and communicates with a portable information terminal to which power is supplied from a cigarette lighter plug, a communication device, and a vehicle information communication device connected to a vehicle power line. The communication is performed by using.

This vehicle information device communication device superimposes a communication signal on a power supply line and communicates via a cigarette lighter plug, thereby maintaining the portability of a portable information terminal and the simplicity of operation such as connection. In addition, communication is performed between the two without newly arranging signal lines.

In FIG. 1, a vehicle information device communication device includes a portable information terminal 11 such as a PDA and a first information terminal such as a car telephone.
A communication device 12 as a communication device, a car navigation system, various sensors, an in-vehicle information communication device 13 as a second communication device such as a tuner, and the like, a portable information terminal 11, a communication device 12, and an in-vehicle information communication device are provided. Each of the devices 13 has an interface circuit 14 built therein.

Each of the portable information terminal 11 and the communication device 12 is connected to a vehicle power supply line 16 via an interface circuit 14, a signal line 20, and a cigarette lighter plug 15 as a connector for connection. The in-vehicle information communication device 13 is connected via an interface circuit 14 to an in-vehicle power supply line 16 branched from the vicinity of the installation location.

The interface circuit 14 provided in each device is a communication signal having a small amplitude that does not affect other devices connected to the vehicle-mounted power supply line 16 and improves the deterioration of communication quality due to noise. The data is modulated into a communication signal such as a spread spectrum signal or a signal according to a protocol based on a communication signal having a small amplitude, and the vehicle power supply line 1 is modulated.
6 is superimposed on a communication signal and transmitted to the communication partner, or a communication signal from the communication partner via the vehicle-mounted power line 16 is received.

Here, the communication partner is a device to communicate other than the own device, for example, the portable information terminal 11.
Is the transmitting side, the communication partner is the communication device 12, the in-vehicle information communication device 13, or the like.

Each of the devices 11 to 13 has a built-in stabilized power supply circuit 17.
The vehicle-mounted power supply line 16 connected to the interface circuit 14 of each device is connected.

The stabilized power supply circuit 17 is supplied with power from a vehicle-mounted battery 18 as a power supply via a vehicle-mounted power supply line 16 as a power supply line, converts the supplied power supply voltage to an appropriate voltage, smoothes the voltage, and smoothes each device. 11 to 13.

Next, the operation of the thus configured vehicle information device communication apparatus of the embodiment will be described. First, here, the data transmitting device that transmits data is, for example, the portable information terminal 11 and the data receiving device that receives the data is, for example, the on-vehicle information communication device 13.

The data transmission side device is the portable information terminal 1
The communication device 12 or the in-vehicle information communication device 13 may be used instead of 1, and the portable information terminal 11 or the communication device 12 may be used instead of the in-vehicle information communication device 13 as the data receiving device.

First, the interface circuit 14 built in the transmitting side device 11 is a communication signal of a small amplitude which does not affect other devices connected to the vehicle power supply line 16 and the communication quality is deteriorated due to noise. Modulates the data into a communication signal such as a spread spectrum signal or a signal according to a protocol based on a communication signal having a small amplitude, and communicates with the vehicle power supply line 16 via the signal line 20 and the cigarette lighter plug 15. The signal is superimposed and transmitted.

This communication signal is transmitted using the vehicle-mounted power supply line 16 as a medium, and is received by the interface circuit 14 built in the receiving-side device 13 connected to the vehicle-mounted power supply line 16 via the cigarette lighter plug 15.

The interface circuit 14 built in the receiving device 13 demodulates data from the received communication signal according to a predetermined protocol, and
Transmit to 3.

At this time, the vehicle power supply line 16 supplies power and the communication signal to all devices connected to its own power supply line, including devices not involved in the communication. However, since the communication signal is a signal having a small amplitude that does not affect those devices, the communication signal does not impair the devices.

As described above, according to the vehicle information device communication device mounted on the vehicle, the portable information terminal 11, the communication device 12, and the vehicle power line 16 to which power is supplied from the cigar lighter plug 15 are connected. When performing communication with the in-vehicle information communication device 13, a communication signal is superimposed on the in-vehicle power line 16, and the communication signal is transmitted and received via the cigarette lighter plug 15 using the in-vehicle power line 16 as a transmission path.

As a result, the portable information terminal 11 and the communication device 12 can form a transmission path for both by simply connecting the cigarette lighter plug 15 for supplying power to the vehicle to the vehicle. At the same time, power can be supplied to the portable information terminal and the communication device. Thus, communication between the portable information terminals can be performed while maintaining portability and operation simplicity such as connection.

Further, the in-vehicle information communication device 13 can configure a transmission path between the devices without arranging a new signal line. In addition, by using a general cigarette lighter plug as the connection connector, the versatility of the device can be increased.

Further, since communication between the devices can be performed without newly arranging a signal line or attaching a connection connector, the number of steps related to the device installation can be reduced.

(Configuration of Each Device) Next, details of each device provided in the vehicle information device communication device will be described. FIG. 2 shows a configuration block diagram of a portable information terminal which is an example of a device provided in the vehicle information device communication device of the embodiment.

The portable information terminal 11 is a portable information terminal body 3
1. The portable information terminal main body 31 is supplied with power from the stabilized power supply circuit 17 via a power supply line 32, and has an interface circuit 14-1, 14-2, and a stabilized power supply circuit 17. Power is supplied to 14-1 and 14-2 from the stabilized power supply circuit 17 via the power supply line 33.

Further, the stabilized power supply circuit 17
7, and connected to the vehicle-mounted power supply line 16 via the cigar lighter plug 15 to be supplied with power. The interface circuits 14-1 and 14-2 are connected to the portable information terminal main body 31 via the internal signal line 41, and
, And connected to an external device (not shown) to which data is to be transmitted and received via the vehicle-mounted power supply line 16.

Next, data transmission / reception processing of the portable information terminal 11 configured as described above will be described with reference to FIG. First, when transmitting data from the portable information terminal 11, first, data is transmitted from the portable information terminal main body 31 to the interface circuit 14-1 via the internal signal line 41.

The interface circuit 14-1 modulates the data received from the portable information terminal 11 into a predetermined protocol, and superimposes the modulated data on the vehicle power supply line 16 via the signal line 20 and the cigarette lighter plug 15. Then, the data is sent to an external device, for example, the communication device 12 or the on-board information communication device 13.

The data communication between the portable information terminal 11 and the communication device 12 and the data communication between the portable information terminal 11 and the on-board information communication device 13 are shown by dotted lines in FIG.

A signal based on this data is received by all receiving-side devices according to the present system including the other interface circuit 14-2. In this case, if the respective interface circuits 14-1 and 14-2 support different protocols, the interface circuits 14-1 and 14-2
-2 mobile information terminal 11 without interference between both signals
And external devices can communicate with each other.

For example, in the spread spectrum system, since spectrum modulation is performed using different spreading codes, signals of other stations can be eliminated as noise without changing hardware, so that both signals are interfered. You will not do it.

On the other hand, when the portable information terminal 11 receives data from an external device, the interface circuit 14-
1, 14-2 are connected to the cigarette lighter plug 1 from the vehicle-mounted power line 16 according to a procedure reverse to the data transmission process described above.
5. Data can be demodulated from a signal received via the signal line 20, and the demodulated signal can be transmitted to the portable information terminal main body 31 via the internal signal line 41.

Each of the interface circuits 14-1,
Since the communication signal from the communication line 14-2 can be transmitted to the vehicle-mounted power supply line 16 via the signal line 20, even when transmitting and receiving a plurality of communication signals, the signal line 20 as one common signal line is used. It only needs to be done.

(Configuration of Interface Circuit) Next, the detailed configuration of the interface circuit provided in each device will be described. FIG. 3 is a configuration block diagram of an interface circuit provided in each device of the embodiment. The interface circuit shown in FIG. 3 is an interface circuit based on a spread spectrum system, and includes a transmitter 51a and a receiver 51b.

Further, each of the transmitter 51a and the receiver 51b connects the power from the vehicle power line 16 to the stabilizing power circuit 1
7, the voltage is changed and the power is stabilized.

The transmitter 51a includes a serial / parallel converter 55a, a timing generator 57a, a counter 59a,
A pseudo noise (PN) sequence generator 61a as a generating means,
Multiplier 63 as modulation means, sequence selection circuit 65a, low-pass filter (LPF) 67a, mixer 69a, carrier generator 71a, amplifier 73a, band-pass filter (B
PF) 69a.

The timing generator 57a generates a timing signal, and outputs this timing signal to the counter 59a and the PN sequence generator 61a. Counter 59a
Counts the timing signal from the timing generator 57a.

The serial / parallel converter 55a converts the parallel data input from the signal line 53a into serial data in synchronization with the output of the counter 59a, and outputs the converted serial data to the multiplier 63 bit by bit. I do.

The sequence selection circuit 65a selects one PN sequence from a plurality of PN sequences prepared in advance. PN
The sequence generator 61a outputs the PN sequence selected by the sequence selection circuit 65a to the multiplier 63 in synchronization with the timing signal of the timing generator 57a.

Multiplier 63 multiplies the bit data from serial / parallel converter 55a by the PN sequence from PN sequence generator 61a to perform spread modulation. LPF6
7a restricts the band by passing only a predetermined band from the output frequency of the multiplier 63, and removes unnecessary signals.

The mixer 69a outputs the output of the LPF 67a
Modulation is performed by the carrier output from the carrier generator 71a. Amplifier 73a amplifies the output of mixer 69a.
After limiting the band of the output from the amplifier 73a, the BPF 75a superimposes the output on the in-vehicle power supply line 16 and outputs it.

The receiver 51b includes a serial / parallel converter 55b, a timing generator 57b, a counter 59b,
PN sequence generator 61b as a generation means, sequence selection circuit 65b, LPF 67b, mixer 69b, carrier generator 7
1b, an amplifier 73b, a BPF 69b, a despread demodulation circuit 77 as demodulation means, and a synchronization control circuit 79.

The BPF 75b removes noise from the received signal received from the vehicle power supply line 16. The amplifier 73b has B
The output from the PF 75b is amplified. Mixer 69b demodulates the received signal with the carrier output from carrier generator 71b.

The LPF 67b limits the band for the output from the mixer 69b and removes unnecessary signals. Despread demodulation circuit 77 demodulates data from the received signal using the PN sequence output from PN sequence generator 61b. The synchronization control circuit 79 performs synchronization control based on the timing signal from the timing generator 57b and the result of the despread demodulation by the despread demodulation circuit 77.

The PN sequence generator 61b includes a synchronization control circuit 7
In synchronism with the output of No. 9, the PN sequence selected by the sequence selection circuit 65b is output. The despreading demodulation circuit 77 demodulates only a signal spread-modulated by the PN sequence selected by the sequence selection circuit 65b, and excludes other signals as noise.

The serial / parallel converter 55b synchronizes with the counter output of the counter 59b, and
7 is parallel-converted to restore data and output via the internal signal line 53b.

Next, the operation of the interface circuit thus configured will be described with reference to FIG. First,
A case where data is transmitted from an interface circuit to an external device will be described.

First, when the parallel data to be transmitted is input to the serial / parallel converter 55a via the signal line 53a, the serial / parallel converter 55a synchronizes with the counter 59a connected to the timing generator 57a. Then, the parallel data input from the signal line 53a is converted into serial data, and the converted serial data is converted into one.
The data is output to the multiplier 63 bit by bit.

On the other hand, the PN sequence generator 61a outputs the PN sequence selected by the sequence selection circuit 65a to the multiplier 63 in synchronization with the timing generator 57a. Then
The bit data from the serial / parallel converter 55a is multiplied by the PN sequence from the PN sequence generator 61a by the multiplier 63, and spread modulation is performed.

Next, the output of the multiplier 63 is the LPF 67a
By limiting the band, unnecessary signals are removed,
The output of the LPF 67a is modulated by the mixer 69a with the carrier output from the carrier generator 71a.

Further, the output of the mixer 69a is
The output from the amplifier 73a is amplified to a predetermined level by 3a, and the output from the amplifier 73a is superposed on the vehicle-mounted power supply line 16 after the band is adjusted by the BPF 75a.

As described above, the spread modulation is performed by calculating the PN sequence and the data, and the obtained spread modulation output is transmitted to the vehicle-mounted power line 16. Therefore, the other data is despread and demodulated by the receiver. It can be eliminated as noise.

Next, a case where the interface circuit receives data from an external device will be described.

First, the signal received from the external device via the in-vehicle power line 16 is subjected to noise removal by the BPF 75b and signal amplification by the amplifier 73b, and then the received signal is output from the carrier generator 71b by the mixer 69b. Demodulated by the carrier. Further, the demodulated signal passes through the LPF 67 b and is input to the despread demodulation circuit 77.

On the other hand, the PN sequence generator 61b is synchronized with the output of the synchronization control circuit 79 for performing synchronization control based on the result of the timing generator 57b and the despread demodulation circuit 77, and is selected by the sequence selection circuit 65b. Output the PN sequence.

The despread demodulation circuit 77 demodulates data from the received signal using the PN sequence output from the PN sequence generator 61b. At this time, in the despread demodulation circuit 77,
Only signals spread and modulated by the sequence selected by the sequence selection circuit 65b are demodulated, and other signals are eliminated as noise.

Then, when the output of the despreading demodulation circuit 77 is input to the serial / parallel converter 55b, the serial / parallel converter 55b switches to the timing generator 57b.
In synchronization with the counter 59b connected to the, the output of the despreading demodulation circuit 77 is parallel-converted to restore the data and output via the internal signal line 53b.

As described above, since the data is despread demodulated from the received signal received from the vehicle-mounted power supply line 16 using the PN sequence, the data can be demodulated without interference with other data.

The present invention is not limited to the above embodiment. The interface circuit according to the embodiment has been described using the spread spectrum method.
The method of the interface circuit is not limited to the spread spectrum method, and another method may be used.

In addition, it goes without saying that various modifications can be made without departing from the technical idea of the present invention.

[0094]

According to the first aspect of the present invention, the input / output means provided in each of the portable information terminal and the first communication device comprises:
Since it is connected to the power line, if the connection connector is connected, the communication signal is output to the communication partner via the power line,
A communication signal is input from a communication partner via a power line.

That is, it is possible to form a transmission path between the portable information terminal and the first communication device via the power supply line and the connection connector, and at the same time, to provide a power supply to the portable information terminal and the first communication device. A supply can also be made. Thus, communication between the portable information terminals can be performed while maintaining portability and operation simplicity such as connection.

According to the second aspect of the present invention, since the second communication device includes the input / output means, it can perform data communication with the portable information terminal or the first communication device via the power supply line. Further, since communication between the devices can be performed without newly arranging a signal line or attaching a connection connector, man-hours related to device installation can be improved.

According to the third aspect of the present invention, the input / output means includes:
Since a small-amplitude signal that does not affect all devices except the communication partner connected to the power line is transmitted to the power line as a communication signal, there is no problem for all devices except the communication partner. Will not give.

According to the fourth aspect of the present invention, since the communication signal from each interface circuit can be sent to the power supply line via the common signal line, even when a plurality of communication signals are transmitted and received, Only one common signal line is required.

According to the fifth aspect of the present invention, since each interface circuit modulates a communication signal into a signal according to a specific protocol and transmits the signal to the power supply line, a plurality of communication signals perform communication without mutual interference. I can do it.

According to the sixth aspect of the present invention, the modulating means performs spread modulation by calculating the pseudo noise sequence generated by the generating means and the communication signal, and sends the obtained spread modulation output to the power supply line. By the despreading demodulation process in the receiver, other communication signals can be eliminated as noise.

According to the seventh aspect of the present invention, the demodulation means despreads and demodulates the communication signal from the received signal received from the power supply line using the pseudo noise sequence generated by the generation means. It is possible to demodulate the communication signal without performing.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a transmission line according to an embodiment of a vehicle information device communication device of the present invention.

FIG. 2 is a configuration block diagram of a portable information terminal that is an example of a device provided in the vehicle information device communication device according to the embodiment;

FIG. 3 is a configuration block diagram of an interface circuit provided in each device of the embodiment.

FIG. 4 is a diagram showing a transmission path configuration of a conventional vehicle information device communication device mounted on a vehicle.

FIG. 5 is a configuration block diagram of a portable information terminal as an example of a device provided in a conventional vehicle information device communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle 11 Portable information terminal 12 Communication device 13 In-vehicle information communication device 14 Interface circuit 15 Cigarette lighter plug 16 In-vehicle power supply line 17 Stabilized power supply circuit 18 In-vehicle battery 20 Signal line 31 Main body of portable information terminal 33 Power supply line 51a Transmitter 51b Receiver 53a, 53b Signal line 55a, 55b Serial / parallel converter 57a, 57b Timing generator 59a, 59b Counter 61a, 61b P / N sequence generator 63a Multiplier 65a, 65b Sequence selection circuit 67a, 67b LPF 69a, 69b Mixer 71a , 71b Carrier generator 73a, 73b Amplifier 75a, 75b BPF 77 Despread demodulation circuit 79 Synchronization control circuit

Claims (7)

[Claims] 1. A portable information terminal and a first communication device mounted on a vehicle and performing data communication between each other, a power supply line connected to a power supply, the power supply line, the portable information terminal, and the first communication device.
A connection connector for connecting the communication device to the portable information terminal and the first communication device, wherein each of the portable information terminal and the first communication device is connected to the power supply line and transmits a communication signal for the data communication to the power supply. An information communication device for a vehicle, comprising: input / output means for outputting to a communication partner via a line and inputting a communication signal from the communication partner via the power supply line. A second communication device that is connected to the power supply line and performs data communication with the portable information terminal or the first communication device; and wherein the second communication device includes the input / output unit. The vehicle information device communication device according to claim 1, further comprising: 3. The input / output means sends a signal of a small amplitude which does not affect all devices except the communication partner connected to the power supply line to the power supply line as the communication signal. The vehicle information device communication device according to claim 1, wherein: 4. The input / output means comprises: a plurality of interface circuits provided corresponding to a plurality of communication signals; and a common signal line for connecting each interface circuit to the power supply line. The information device communication device for a vehicle according to claim 1, wherein 5. The apparatus according to claim 4, wherein each of the interface circuits has a unique protocol different from each other, modulates the communication signal into a signal according to the unique protocol, and sends the signal to the power supply line. The information device communication device for a vehicle according to the above. 6. Each of the interface circuits includes: a generating means for generating a pseudo-noise sequence; and performing spread modulation by calculating the pseudo-noise sequence generated by the generating means and the communication signal. And a modulating means for transmitting a signal to the power supply line. 7. Each of the interface circuits includes: a generation unit that generates a pseudo noise sequence; and a despread demodulation of the communication signal from a reception signal received from the power supply line using the pseudo noise sequence generated by the generation unit. The communication device according to claim 6, further comprising: a demodulation unit.