CN107872751B - Earphone accessory switching device and signal switching method of earphone accessory - Google Patents
Earphone accessory switching device and signal switching method of earphone accessory Download PDFInfo
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- CN107872751B CN107872751B CN201610850599.7A CN201610850599A CN107872751B CN 107872751 B CN107872751 B CN 107872751B CN 201610850599 A CN201610850599 A CN 201610850599A CN 107872751 B CN107872751 B CN 107872751B
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- earphone
- control signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- Acoustics & Sound (AREA)
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Abstract
The present invention relates to the field of signal switching devices, and in particular, to an earphone accessory switching device and a signal switching method of an earphone accessory. The invention provides an earphone accessory switching device, which comprises an earphone socket, a connecting interface and a device switching circuit; the earphone socket is suitable for inserting an earphone plug of an earphone accessory; the connection interface is suitable for being electrically connected with the portable equipment; the device switching circuit is electrically connected with the earphone socket and the connecting interface so as to receive an earphone control signal of the earphone accessory and provide a device control signal to the portable equipment through the connecting interface; the device switching circuit provides a device control signal according to the DC level and the frequency of the earphone control signal. The earphone accessory switching device and the signal switching method of the earphone accessory can smoothly connect the earphone accessory and the portable equipment without influencing the line control function of earphone configuration.
Description
Technical Field
The present invention relates to the field of signal switching devices, and in particular, to an earphone accessory switching device and a signal switching method of an earphone accessory.
Background
Due to the compact pace of life of modern people, various portable devices that are convenient to carry have also been emerging, and the design trend of portable devices is toward lightness and thinness. With the trend of slimness, 3.5mm (cm) earphone sockets are replaced by other types of sockets, such as lightning (Lighting) sockets or Universal Serial BUS (USB) sockets, which are made by APPLE (APPLE) corporation. Moreover, when an earphone accessory (e.g., an earphone or an earphone microphone) with a line control function is coupled to the portable device through the adaptor, the earphone accessory may only have a function of playing audio, and cannot control the portable device, such as start playing, stop playing, pause playing, volume increase, volume decrease, and the like, so that the convenience of the earphone accessory is greatly affected.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an earphone accessory switching device and a signal switching method of an earphone accessory, which can smoothly connect the earphone accessory and portable equipment without influencing the line control function of earphone configuration.
The invention provides an earphone accessory switching device which comprises an earphone socket, a connecting interface and a device switching circuit. The earphone socket is suitable for inserting an earphone plug of an earphone accessory. The connection interface is suitable for being electrically connected with the portable equipment. The device switching circuit is electrically connected with the earphone socket and the connecting interface to receive an earphone control signal of the earphone accessory and provide a device control signal to the portable equipment through the connecting interface. The device switching circuit comprises a signal acquisition device, a potential detector and a signal comparison module. The signal extractor receives the earphone control signal to judge a frequency of the earphone control signal and correspondingly provides a frequency judging signal. The potential detector receives the earphone control signal to judge a DC level of the earphone control signal and correspondingly provides a level judging signal. The signal comparison module is coupled with the signal extractor and the potential detector to provide a device control signal according to the frequency judgment signal and the level judgment signal.
The signal switching method of the earphone accessory is suitable for an earphone accessory switching device, the earphone accessory switching device is electrically connected with an earphone accessory and portable equipment, and the signal switching method comprises the following steps. An earphone control signal of the earphone accessory is received through a device switching circuit. A signal extractor of the device switching circuit is used for judging the frequency of the earphone control signal and correspondingly providing a frequency judging signal. A level detector of the device switching circuit determines a DC level of the earphone control signal and correspondingly provides a level determination signal. A signal comparison module of the device switching circuit provides a device control signal to the portable equipment according to the frequency judgment signal and the level judgment signal.
Based on the above, in the earphone accessory switching device and the signal switching method of the earphone accessory in the embodiments of the present invention, the control function of the earphone control signal is determined by determining the frequency and the dc level of the earphone control signal provided by the earphone accessory, and the corresponding device control signal is provided to the portable device according to the control function of the earphone control signal. Therefore, the earphone accessory switching device can be suitable for judging the control function of the earphone control signal in different signal modes, so that the line control function of the earphone accessory can still be normally used.
Drawings
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a system diagram of an earphone accessory adapter according to an embodiment of the present invention;
fig. 2 is a system diagram of an earphone accessory adapter according to another embodiment of the present invention;
FIG. 3 is a system diagram of a preamplifier according to an embodiment of the invention;
fig. 4 is a flowchart of a signal transferring method of an earphone accessory according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method of operating a device adapter circuit according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating the interrupt behavior of the signal extractor according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating the interrupt behavior of the potential detector according to an embodiment of the present invention.
Description of the symbols
10: an earphone accessory;
11. 12: a line control key;
20: a portable device;
21: a signal receiving module;
100. 200: an earphone accessory switching device;
110: an earphone jack;
120: a device transfer circuit;
121: a signal acquisition device;
123: a potential detector;
125: a signal comparison module;
130: connecting an interface;
210: a preamplifier;
310: a high-pass filter;
320: a signal amplifier;
330: a filter;
SCD: a device control signal;
SCE: an earphone control signal;
SCeh: enhancing the control signal;
and (2) SCEr: a control reference signal;
SFD: a frequency judging signal;
SLD: judging a signal according to the reference level;
s410, S420, S430, S440, S510, S520, S530, S540, S550, S560, S610, S620, S630, S640, S650, S710, S720, S730, S740, S750: and (5) carrying out the following steps.
Detailed Description
Fig. 1 is a system diagram of an earphone accessory adapter according to an embodiment of the present invention. As shown in the figure, in the present embodiment, the earphone accessory adapter 100 couples the earphone accessory 10 and the portable device 20, so as to convert the earphone control signal SCE of the earphone accessory 10 into the device control signal SCD and transmit the device control signal SCD to the portable device 20. The headset accessory 10 may have at least one front control button (e.g., 11, 12) to provide the headset control signal SCE, and the headset accessory 10 may be a headset (earphone) or a headset (headset). The portable device 20 may have a signal receiving module 21 to receive the device control signal SCD provided by the headset accessory adapting device 100, and the portable device 20 is, for example, a mobile phone or a tablet computer.
The headset accessory adapting device 100 comprises a headset socket 110, a device adapting circuit 120 and a connection interface 130. The earphone socket 110 is adapted to be inserted by an earphone plug of the earphone accessory 10 to connect the earphone accessory adapter device 100 with the earphone accessory 10 and receive the earphone control signal SCE provided by the earphone accessory 10. The connection interface 130 is adapted to electrically connect with the signal receiving module 21 of the portable device 20. The device adapter circuit 120 is electrically connected to the earphone socket 110 and the connection interface 130, so as to receive the earphone control signal SCE of the earphone accessory 10 through the earphone socket 110, and provide the device control signal SCD to the signal receiving module 21 of the portable device 20 through the connection interface 130 after obtaining the corresponding device control signal SCD according to the earphone control signal SCE of the earphone accessory 10.
In the present embodiment, the device adapter circuit 120 includes a signal extractor 121, a potential detector 123 and a signal comparison module 125. The signal extractor 121 receives the headphone control signal SCE to determine the frequency of the headphone control signal SCE, and correspondingly provides a frequency determination signal SFD. The level detector 123 receives the headphone control signal SCE to determine the dc level of the headphone control signal SCE, and correspondingly provides the level determination signal SLD. The signal comparing module 125 is coupled to the signal extractor 121 and the potential detector to provide the device control signal SCD according to the frequency determining signal SFD and the level determining signal SLD.
Further, the signal comparison module 125 determines the control function of providing the headphone control signal SCE according to the frequency determination signal SFD and the level determination signal SLD, and provides the device control signal SCD corresponding to the control function. As shown in table 1 below, the setting manner of the earphone control signal SCE of the APPLE (APPLE) camp and the Android (Android) camp is not exactly the same. In other words, the earphone control signal SCE for apple camps may include a dc level or an audio signal, while the earphone control signal SCE for android camps only includes a dc level.
Table 1:
| control function | Apple camp | Android camp |
| Play/pause | Biased at 0 volts | Biased at 0 volts |
| Volume increase | Audio signal 165 k-175 khz | Bias voltage of 0.2-0.256 volts |
| Volume reduction | Audio signal 130 k-140 k Hz | Bias voltage of 0.309-0.519 volt |
According to the above setting, when the frequency determination signal SFD indicates that the headphone control signal SCE does not include an audio signal, the headphone control signal SCE may be sent out by the headphone accessory 10 in apple camps or android camps; when the frequency judging signal SFD indicates that the headphone control signal SCE contains an audio signal, the headphone control signal SCE should be sent by the headphone accessory 10 in apple camps. Then, according to the signal characteristics (as shown in table 1) of the earphone control signal SCE of the apple lineup or the android lineup, the control function represented by the earphone control signal SCE can be found out.
In the embodiment of the present invention, the headset accessory adapting device 100 can be connected to the portable device 20 through a wired manner or a wireless manner, i.e. the connection interface 130 can be a wired connection interface or a wireless connection interface. When the connection Interface 130 is a wired connection Interface, the signal comparison module 125 may provide a Device control signal SCD corresponding to a control function of the earphone control signal SCE according to a Human Interface Device (HID) specification. When the connection interface 130 is a wireless connection interface, the signal comparison module 125 may provide the device control signal SCD corresponding to the control function of the earphone control signal SCE according to a human-computer interface specification or an Audio Video Remote Control Profile (AVRCP). The wired connection interface may adopt a Universal Serial Bus (USB) interface, and the Wireless connection interface may adopt a Bluetooth (Bluetooth) interface or a Wireless Fidelity (WiFi) interface.
Fig. 2 is a system diagram of an earphone accessory adapter according to another embodiment of the present invention. Referring to fig. 1 and 2, the headset accessory adapter 200 is substantially the same as the headset accessory adapter 100, except that the headset accessory adapter 200 further includes a preamplifier 210. In the present embodiment, the preamplifier 210 is used to amplify the headphone control signal SCE, and can suppress noise in the headphone control signal SCE. In other words, the preamplifier 210 is coupled to the earphone socket 110 to receive the earphone control signal SCE and provides the amplified earphone control signal SCEa to the device adapter circuit 120, so as to facilitate the signal extractor 121 and the level detector 123 to perform signal sampling.
FIG. 3 is a system diagram of a preamplifier according to an embodiment of the invention. Referring to fig. 2 and 3, in the present embodiment, the preamplifier 210 includes a high pass filter 310, a signal amplifier 320 and a filter 330. The high pass filter 310 receives the headphone control signal SCE to provide a control reference signal SCEr. The signal amplifier 320 is coupled to the high pass filter 310 to receive the control reference signal SCEr and provide an enhanced control signal SCEh. The filter is coupled to the signal amplifier 320 to receive the enhancement control signal SCEh and provide an amplified headphone control signal SCEa.
Fig. 4 is a flowchart of a signal transferring method of an earphone accessory according to an embodiment of the present invention. Referring to fig. 4, in the present embodiment, a signal forwarding method of an earphone accessory includes the following steps. In step S410, an earphone control signal of the earphone accessory is received through the device switching circuit. In step S420, the frequency of the earphone control signal is determined by the signal extractor of the device adapter circuit, and a frequency determination signal is provided accordingly. In step S430, the level detector of the device adapter circuit determines the dc level of the earphone control signal, and correspondingly provides a level determination signal. Finally, in step S440, the device control signal is provided to the portable device according to the frequency determination signal and the level determination signal through the signal comparison module of the device switching circuit. The sequence of steps S410, S420, S430 and S440 is for illustration, and the embodiment of the invention is not limited thereto. Moreover, the details of steps S410, S420, S430 and S440 can be described with reference to the embodiments of fig. 1 to 3, and are not repeated herein.
FIG. 5 is a flowchart illustrating a method of operating a device adapter circuit according to an embodiment of the present invention. Referring to fig. 1 and 5, in the embodiment of the invention, the device adapter Circuit 120 may be a pure Circuit type, for example, implemented by an Application Specific Integrated Circuit (ASIC); or a combination of hardware and programming, for example implemented by a microcontroller.
The device adapter circuit 120 is implemented by a microcontroller, for example, wherein the signal extractor 121 includes a Fast Fourier Transform (FFT) processor and a frequency decoder, and the potential detector 123 includes an analog-to-digital converter, for example. Also, in microcontrollers, hardware circuits (such as fast fourier transform processors, frequency decoders, and analog-to-digital converters) are typically called out through interrupt flags.
The operation method of the device adapter circuit 120 includes the following steps. In step S510, the device changeover circuit is started. In step S520, the potential detector 123 and the signal extractor 121 are initialized to start the basic functions of the potential detector 123 and the signal extractor 121, so as to determine the frequency and the dc level of the earphone control signal SCE. In step S530, it is determined whether the headphone control signal SCE includes an audio signal according to the frequency and the dc level of the headphone control signal SCE.
When the headphone control signal SCE includes an audio signal, the determination result in step S530 is yes, which means that the headphone control signal SCE needs to be sampled by the signal extractor 121. Next, in step S540, the signal extractor 121 is set to completely start the signal extractor 121. In step S550, the signals output by the potential detector 123 and the signal extractor 121 are read and the interrupt is waited for to be completed.
When the headphone control signal SCE does not include an audio signal, the determination result in step S530 is "no", which means that the headphone control signal SCE does not need to be sampled by the signal extractor 121 in a more complicated manner, and thus step S540 is skipped and step S550 is directly performed.
In step S560, the control function of the earphone control signal SCE is known according to the signals output by the potential detector 123 and the signal extractor 121, and then the device control signal SCD is transmitted to the portable device 20 according to the control function of the earphone control signal SCE.
FIG. 6 is a flowchart illustrating an interrupt behavior of a signal extractor according to an embodiment of the present invention. Referring to fig. 1, 5 and 6, in the present embodiment, the interrupt behavior of the signal extractor includes the following steps. In step S610, the interrupt flag of the signal extractor 121 is enabled. In step S620, the headphone control signal SCE is converted from the time domain to the frequency domain by the signal extractor 121. In step S630, the signal extractor 121 determines the frequency and the pressing time of the headphone control signal SCE for decoding. In step S640, the control function corresponding to the headphone control signal SCE is stored. In step S650, the interrupt flag of the signal extractor 121 is disabled.
FIG. 7 is a flowchart illustrating the interrupt behavior of the potential detector according to an embodiment of the present invention. Referring to fig. 1, 5 and 7, in the present embodiment, the interrupt behavior of the signal extractor includes the following steps. In step S710, the interrupt flag of the potential detector 123 is enabled. In step S720, the voltage level of the earphone control signal SCE is read by the level detector 123. In step S730, the voltage level is determined by the potential detector 123. In step S740, the control function corresponding to the headphone control signal SCE is stored. In step S750, the interrupt flag of the potential detector is disabled.
In summary, in the headset accessory switching device and the signal switching method of the headset accessory in the embodiments of the present invention, the frequency and the dc level of the headset control signal provided by the headset accessory are determined to determine the control function of the headset control signal, and a corresponding device control signal is provided to the portable device according to the control function of the headset control signal. Therefore, the earphone accessory switching device can be suitable for judging the control function of the earphone control signal in different signal modes, so that the line control function of the earphone accessory can be normally used.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An earphone accessory adapter device comprising:
the earphone socket is suitable for inserting an earphone plug of the earphone accessory;
a connection interface adapted to electrically connect to a portable device; and
a device switching circuit electrically connected to the earphone jack and the connection interface for receiving an earphone control signal of the earphone accessory and providing a device control signal to the portable device through the connection interface, wherein the device switching circuit comprises:
a signal pick-up device for receiving the earphone control signal to judge a frequency of the earphone control signal and correspondingly providing a frequency judging signal;
a potential detector for receiving the earphone control signal to determine a DC level of the earphone control signal and correspondingly providing a level determination signal; and
a signal comparison module coupled to the signal extractor and the potential detector for providing the device control signal according to the frequency determination signal and the level determination signal;
a preamplifier, receiving the earphone control signal, for providing the amplified earphone control signal to the device switching circuit;
the preamplifier includes:
a high pass filter for receiving the earphone control signal to provide a control reference signal;
a signal amplifier coupled to the high pass filter for receiving the control reference signal and providing an enhanced control signal; and
a filter coupled to the signal amplifier for receiving the enhancement control signal and providing the amplified headphone control signal.
2. The device of claim 1, wherein the signal comparison module of the device determines a control function of the headset control signal according to the frequency determination signal and the level determination signal, so as to provide the device control signal according to the control function.
3. The Device of claim 2, wherein the connection Interface of the headset accessory adapter Device is a wired connection Interface, and the signal comparison module provides the Device control signal corresponding to the control function according to a Human Interface Device (HID) specification.
4. The device of claim 3, wherein the wired connection interface of the device is a Universal Serial Bus (USB) interface.
5. The device of claim 2, wherein the connection interface of the device is a wireless connection interface, and the signal comparison module provides the device Control signal corresponding to the Control function according to a human interface specification (hmi) or an Audio Video Remote Control Profile (AVRCP).
6. The device as claimed in claim 5, wherein the Wireless connection interface of the device is a Bluetooth (Bluetooth) interface or a Wireless Fidelity (WiFi) interface.
7. The device of claim 1, wherein the headset accessory comprises at least one line control button for providing the headset control signal.
8. The device for adapting an earphone accessory according to claim 1, wherein the portable apparatus of the device for adapting an earphone accessory comprises a signal receiving module coupled to the device adapting circuit for receiving the device control signal provided by the device adapting circuit.
9. A signal switching method of an earphone accessory is suitable for an earphone accessory switching device, the earphone accessory switching device is electrically connected with an earphone accessory and portable equipment, and the signal switching method comprises the following steps:
receiving an earphone control signal of the earphone accessory through a device switching circuit;
providing an amplified earphone control signal through a preamplifier, wherein the preamplifier comprises a high-pass filter, a signal amplifier and a filter; the high-pass filter receives the headphone control signal to provide a control reference signal; the signal amplifier is coupled with the high-pass filter to receive the control reference signal and provide an enhanced control signal; the filter is coupled with the signal amplifier to receive the enhancement control signal and provide an amplified earphone control signal;
judging a frequency of the earphone control signal through a signal extractor of the device switching circuit, and correspondingly providing a frequency judgment signal;
a level detector of the device switching circuit judges a direct current level of the earphone control signal and correspondingly provides a level judging signal;
a signal comparison module of the device switching circuit provides a device control signal to the portable equipment according to the frequency judgment signal and the level judgment signal.
10. The signal adapting method according to claim 9, wherein the step of providing the device control signal according to the frequency determination signal and the level determination signal in the signal adapting method comprises:
judging a control function of providing the earphone control signal according to the frequency judgment signal and the level judgment signal through the signal comparison module; and providing the device control signal corresponding to the control function through the signal comparison module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610850599.7A CN107872751B (en) | 2016-09-27 | 2016-09-27 | Earphone accessory switching device and signal switching method of earphone accessory |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610850599.7A CN107872751B (en) | 2016-09-27 | 2016-09-27 | Earphone accessory switching device and signal switching method of earphone accessory |
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| CN107872751A CN107872751A (en) | 2018-04-03 |
| CN107872751B true CN107872751B (en) | 2020-04-14 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114446261B (en) * | 2020-10-30 | 2023-12-01 | 高创(苏州)电子有限公司 | Method for controlling display by using earphone by wire and related device |
| CN112804610B (en) * | 2021-01-07 | 2022-06-10 | 深圳市博陆科电子科技有限公司 | Method for controlling Microsoft Teams on PC through TWS Bluetooth headset |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5226077A (en) * | 1992-03-02 | 1993-07-06 | Acs Communications, Inc. | Headset amplifier with automatic log on/log off detection |
| CN101489159A (en) * | 2008-01-14 | 2009-07-22 | 苹果公司 | Electronic device and electronic device accessory |
| CN103414070A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal receiving and switching device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100115149A1 (en) * | 2002-12-02 | 2010-05-06 | Plantronics, Inc. | System and method for digital signaling of computer headset connection status |
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2016
- 2016-09-27 CN CN201610850599.7A patent/CN107872751B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5226077A (en) * | 1992-03-02 | 1993-07-06 | Acs Communications, Inc. | Headset amplifier with automatic log on/log off detection |
| CN101489159A (en) * | 2008-01-14 | 2009-07-22 | 苹果公司 | Electronic device and electronic device accessory |
| CN103414070A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal receiving and switching device |
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