JPS62291227A - Digital data transmission system - Google Patents

Abstract

PURPOSE:To eliminate that a transmitting speed is increased unnecessarily and to raise a transmission efficiency by using the violation of a bipolar signal. CONSTITUTION:At a transmitting side, a violation control signal is outputted when a condition information input IN2 is an 'ON' condition in a violation control circuit 1. A transmitting code converting circuit 2 converts the unipolar signal of a data input IN1 to a bipolar signal, converts a violation and sends by the control signal from the violation control circuit 1. At the receiving side, the signal of a receiving input IN3 is converted from the bipolar signal to the unipolar signal by a receiving code converting circuit 3, and a data output OUT1 is reproduced and outputted. On the other hand, a violation detecting circuit 4 inputs the output from the receiving code converting circuit 3, detects the violation and reproduces and outputs condition information OUT2.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention provides a digital data transmission method in which state information is transmitted by violation of a bipolar signal in a baseband digital data transmission system. Regarding transmission methods.

〔overview〕

In a digital data transmission system that transmits digital data in a time-series manner, the present invention converts a unipolar signal, which is the digital data, into a bipolar signal on the transmitting side, and also adds a violation to the digital data in accordance with state information. The bipolar signal received by the receiving side is converted into a unipolar signal and the digital data is reproduced, and the presence or absence of the violation is detected and the status information is reproduced, thereby transmitting data. This is to avoid making the speed unnecessarily high (and to improve transmission efficiency).

(Prior Art) Conventionally, in baseband digital data transmission, as shown in FIG. The transmission was carried out in an envelope configuration, and a frame bit F was inserted for identification of the envelope, that is, an envelope configuration consisting of frame bits F, data bits D, and status bits S was used.

[Problem that the invention seeks to solve]

In the conventional envelope-based digital data transmission method described above, the state information corresponding to the status bits has the characteristic of maintaining the same state for a very long time, whether it is a data communication state or not, and therefore the information speed is slow. Despite this, the transmission speed was determined by envelope transmission, so it was generally unnecessarily high, and furthermore, it had the disadvantage of poor data transmission efficiency due to the status bit and frame beat/beat transmission.

An object of the present invention is to provide a digital data transmission system that can improve transmission efficiency without unnecessarily increasing transmission speed by eliminating the above-mentioned drawbacks.

[Means for solving problems]

The present invention provides a digital data transmission method for transmitting digital data in time series, in which the transmitting side converts a unipolar signal, which is the digital data, into a bipolar signal, and also converts the unipolar signal, which is the digital data, into a bipolar signal in accordance with state information. The digital data is transmitted with a violation, and the receiving side converts the received bipolar signal into a unipolar signal and reproduces the digital data, and also detects the presence or absence of the violation and reproduces the status information. do.

[For production]

The present invention converts a unipolar signal, which is digital data, into a bipolar signal on the transmitting side, and also converts the above data by associating, for example, "on" and "off" of status information with "presence" and "absence" of violation. A violation is applied to a predetermined bit of the data bits to be transmitted, and the receiving side converts the bipolar signal into a unipolar signal and reproduces the digital data, and also determines whether there is a violation or not. Detect and reproduce the above state information.

Therefore, in the frame structure, the frame bits and status bits required in the envelope transmission method are no longer necessary.

In this way, it is possible to avoid increasing the transmission speed unnecessarily and to improve transmission efficiency.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of a digital data transmission system to which an embodiment of the present invention is applied. In Figure 1, INI and IN2.0UTI are data input, status information input, and transmission output on the transmitting side, respectively.
N3.0+JT1.01! T2 are the reception input, data output, and status information output of the reception example, respectively. 1 is a violation control circuit that inputs state information and controls violation conversion; 2 is a violation control circuit that converts a data input unipolar signal into a bipolar signal, and performs violation conversion based on control information from violation control circuit 1; 3 is a reception code conversion circuit that converts a bipolar signal into a unipolar signal, and 4 is a violation detection circuit that detects the presence or absence of a violation and reproduces state information.

Next, the operation of this embodiment will be explained. Status information
"On", "Off" and "Yes" for violation,
Define "nothing".

The transmitting side outputs a violation control signal when the state information input IN2 of the violation control circuit 1 is in the "on" state. In the transmission code conversion circuit 2, data input I! In addition to converting the unipolar signal of 11 into a bipolar signal, the control signal from the violation control circuit 1 performs violation conversion on the bit of data bit ElrlJ and sends it out.

On the receiving side, a receiving code conversion circuit converts the signal at the receiving input IN3 from a bipolar signal to a unipolar signal, and reproduces and outputs a data output 0UTI. On the other hand, the violation detection circuit 4 inputs the output from the reception code conversion circuit 3,
Detects a violation in the data bit and checks the status information O1l? 2 is reproduced and output.

〔Effect of the invention〕

As explained above, the present invention compares to the conventional envelope transmission method by transmitting status information without adding status bits and without adding frame bits to distinguish between data bits and status bits. However, the transmission speed can be lowered, and data transmission efficiency can be increased when comparing the same transmission speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main parts of a digital transmission system to which an embodiment of the present invention is applied. FIG. 2 is an explanatory diagram showing a conventional frame. l... Violation control circuit, 2... Transmission code conversion circuit, 3... Reception code conversion circuit, 4... Violation detection circuit, D... Data bit, F...
・Frame bit, S...Status bit.

Claims (1)

[Claims] (1) In a digital data transmission method that transmits digital data in a time-series manner, the transmitting side converts the unipolar signal, which is the digital data, into a bipolar signal, and also converts the digital data into a biosignal according to the state information. The receiving side converts the received bipolar signal into a unipolar signal and reproduces the digital data, and also detects the presence or absence of the violation and reproduces the status information. Digital data transmission method.