JPH02239754A - Data transmission system - Google Patents

Abstract

PURPOSE:To attain data transmission without delay fluctuation by applying sampling of an input data based on a frame pulse as a reference. CONSTITUTION:An input data is sampled by sampling pulses A-H and a sampling output '0000001111111...' is obtained. The data is sampled by a high speed clock, the position of a change point is subject to time quantization and encoded, and information representing the presence of a change is added just after the change point code. A multiplex section 8 multiplexes the data corresponding to the sampling pulses A-H to a channel corresponding to a succeeding frame. A demultiplex section 13 outputs the multiplexed data from a frame synchronizing pulse of the next frame in the order of the sampling pulses A-H. A decoding reproducing section 14 decodes and reproduces the input data from the demultiplexed signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission system for multiplexing and transmitting digital data. In particular, it relates to a data transmission system without delay fluctuations.

[Conventional technology]

Conventional data transmission methods involve converting into an analog signal using a modulation/demodulation device, converting this analog signal into an analog multiplex converter or analog-to-digital converter, multiplexing it with a digital multiplex converter, and then transmitting it, although there is an absolute delay. , transmission with little delay variation is possible. There is also a method of simply sampling the direct input data, but the sampling distortion is large and this causes delay fluctuations.

[Problem to be solved by the invention]

In such conventional data transmission systems, in order to reduce delay fluctuations, a PC band or G band modem is used to convert the signal into an analog signal, which is extremely inefficient when considering the band and data rate.

Furthermore, the method of simply sampling data and transmitting it digitally has the disadvantage that delay fluctuations occur due to sampling distortion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transmission method in which occurrence of delay fluctuations caused by sampling distortion due to simple sampling is suppressed.

[Means to solve the problem]

The present invention includes a sampling means for sampling input data with a sampling pulse synchronized with a frame synchronization pulse and generating a sample value signal, and a change point code for detecting a level change of the input data from the sample value signal and generating a change point code. point detection means, and time quantization means for measuring the level change time of the input data at a time obtained by quantizing the time between the sampling pulse and the next sampling pulse at a finer cycle and generating a time position code. , change direction detection means for generating a level change direction code indicating whether the input data rises or falls from the sample value signal; and converting the change point code, the time position code, and the change direction code into a series of codes. The data level change time is included in the received data, and is comprised of a transmitting section including a combining means for converting the data, and a receiving section including a means for reproducing the input data using the series of codes from the transmitting section. shall be.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a time chart showing the operation of this embodiment.

First, the configuration of this embodiment will be explained based on FIG. This embodiment device is composed of a transmitting side and a receiving side, and the transmitting side includes a pulse pattern generating section 1, a sampling pulse generating section 2, a sampling section 3, a change point detecting section 4, and a time quantizing section. 5, a change direction detection section 6, a coupling section 7, a multiplexing section 8, and a U/B conversion section 9, and the receiving side includes a pulse pattern generation section 10 and a sampling pulse generation section 1.
B/U conversion section l2, separation section l3, and combination section l4
and a reproduction section 15. Here, the pulse pattern generator 1 generates a frame pulse that determines the frame configuration, and the sampling pulse generator 2 generates a sampling pulse synchronized with the frame pulse. The sampling unit 3 samples input data based on the sampling pulse. The change point detection unit 4 detects the presence or absence of a change in input data and generates a change point code. Time quantization unit 5
quantizes the time position of the input data change point by dividing the sampling pulse between the sampling pulses where the input data change point exists, and outputs it as a time position code. The change direction detection unit 6 detects whether the input data has changed upward or downward, and generates a change direction code.

The combining unit 7 combines the outputs of the above-mentioned change point detection unit 4, time quantization unit 5, and change direction detection unit 6 into a series of codes. The multiplexer 8 inserts and multiplexes output data between frame pulses into a corresponding channel of the next frame. The U/B conversion unit 9 performs U/B conversion on the multiplexed data. The pulse pattern generating section 10 is
Generates a frame sync pulse. The sampling pulse generator 11 generates a sampling pulse synchronized with the frame synchronization pulse of the pulse pattern generator 10. B/
The U converter 12 performs B/U conversion on the received signal. Separation part 1
4 separates the received signal into each channel based on the output of the multiplexed received signal pulse pattern generator 10. Decoding unit 15
detects a change point code indicating that there is a change point from the received signal, and decodes the time position code and change direction code that immediately follow it. The reproducing unit 15 reproduces and outputs output data using the decoded time quantization position, change direction, and sampling pulse.

Next, the operation of this embodiment will be explained based on FIGS. 1 and 2.

The sampling pulse is synchronized with the frame sync pulse. Here, there are eight sampling pulses A to H in one frame. The next frame also has eight sampling pulses A-H. The input data is sampled with sampling pulses A to H, and the sampling output is r000.
0001111111......" is obtained. Incidentally, the point of change in the input data is between sampling pulses F and G. This period is sampled using a high-speed clock, and the position of the change point is time quantized and encoded. Here it is encoded with 5 bits (e.g. 01100)
Output as . This time position code is added immediately after a change point code (for example, a code of 01) indicating information that there has been a change. Also, the input data is changing upward. This is encoded here with 1 bit (for example, 1)
and add this immediately after the time position code. Therefore, the output is “000000010110011111・
......'', and the bits at the positions of sampling pulses G and H become a code pattern indicating that there has been a change in the input data, and the bits at the positions of sampling pulses
The 5 bits at positions ~E become a code pattern for time quantization, and the 1 bit at the position of sampling pulse F becomes a code pattern indicating the direction of change. The multiplexer 8 multiplexes the data corresponding to the sampling pulses A to H onto the corresponding channel of the next frame.

On the receiving side, the demultiplexer 13 outputs the multiplexed data in the order of the frame synchronization pulse of the next frame and the sampling pulses A to H. The decoding and reproducing section 14 decodes and reproduces the input data from the separated signals.

FIG. 3 is a circuit diagram of the decoding and reproducing section. In the figure, a speed conversion circuit 14 converts the output of the separation section 13 to the same speed as the input speed of the coupling section 7. The conversion code detection circuit 142 detects a change point code from the speed-converted received data,
The detection signal is given to the reproduction circuit 145. In addition, the detection circuit 1
42 supplies a 5-bit time position code following this change point code to a time position code decoding circuit 144, and also provides a 1-bit change point direction code to a change direction determining circuit. The time position decoding circuit 144 knows the time position from the time position code and provides the position information to the reproducing unit 145, and the changing point determining circuit 143 determines whether it is a rising or falling point from the changing point code and similarly reproduces the to circuit 145. Regeneration circuit 14
Reference numeral 5 includes a counter, a flip-flop, etc., and reproduces the input data based on the change point detection signal, time position information, and change direction determination signal.

〔Effect of the invention〕

As explained above, although there is an absolute delay, the present invention has the advantage of being able to perform data transmission without delay fluctuations because sampling is performed based on frame pulses.

1, 10...Pulse pattern generating section, 2. 1
1... Sampling pulse generator, 3...
... Sampling section, 4... Change point detection section,
5... Time quantization unit, 6... Change direction detection unit, 7... Combining unit, 8... Multiplexing unit, 9... ...U/B conversion section, 12...B
/U conversion section, 13... Separation section, 14...
・Decoding unit, 15... Reproducing unit.

Agent: Patent Attorney Susumu Uchihara

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention;
FIG. 2 is a time chart showing the operation of the embodiment of the present invention, and FIG. 3 is a diagram showing details of the decoding/reproducing section. Anatomist

Claims (1)

[Scope of Claims] Sampling means for sampling input data with a sampling pulse synchronized with a frame synchronization pulse to generate a sample value signal; and detecting a level change in the input data from the sample value signal to generate a change point code. and time quantization that measures the level change time of the input data at a time obtained by quantizing the time between the sampling pulse and the next sampling pulse in a finer cycle and generates a time position code. means, change direction detection means for generating a level change direction code indicating whether the input data rises or falls from the sampling value signal; and converting the change point code, the time position code, and the change direction code into a series of A transmitting section including a combining means for converting into a code, and a receiving section including a means for reproducing the input data by the series of codes from the transmitting section, and the level change time of the data is included in the received data. A data transmission method characterized by