JPS63160442A - Data transmission system - Google Patents

Abstract

PURPOSE:To output a voice without unnatural intermission of voice at a reception side or data crosstalk by providing a voice delay circuit respectively to transmission/reception side so as to mix the voice and signal at the transmission side. CONSTITUTION:A voice input signal 14 inputted from a voice input section 1 is delayed T1 by a delay circuit 2 and an interblock time T2 exists between voices 15 and 16. The detector 3 outputs a notice signal to the control circuit 4 while detecting the interblock time T2. In closing an analog switch 5 after the time (T1-T2) elapses, the control section 4 starts the data generating source 6, which sends a signal, completes the transmission within the time T2 and opens the analog switch 5 again. The voice signal 25 is inputted from a signal input section 7, the data 27 is inputted again, then it is detected by a detection section 9 to inform it to the control section 10, the control section 10 closes the analog switch 11 or the data transmission time T2 after the time T1 elapses and then opens the switch again. Thus, only voice signals 33, 34 are sent to a speaker 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a data transmission system in which voice and data are transmitted in a mixed manner using a single transmission path, and the two are separated and reproduced on the receiving side.

[Prior art and its problems]

Conventionally, in order to mix voice and data on a single transmission path, a method has been adopted in which data is layered on top of voice.

This method forcibly cuts off audio while transmitting data.
It is necessary to avoid congestion between the two parties, but this has the drawback that the audio played back on the receiving side is interrupted, making it difficult or impossible to understand the content of the call. Furthermore, since what is played back on the receiving side is not just the audio, but also the data, the audio transmission quality is also degraded from this point of view.

In order to avoid data transmission colliding with audio, the data transmission time and audio transmission time are set at different timings, and when one mode is operating, the other mode is stopped. However, the timing of mutual mode switching must be determined by the operator, or the timing must be fixed, which results in extremely poor man-machine interface and versatility. To mask the sound, detect test patterns such as frame synchronization in the data.

After that, the audio output may be stopped for a fixed period of time, or if the data transmission timing is fixed, the audio output may be stopped for a corresponding period of time.

In the case of this method, the former has the disadvantage that the audio output does not stop until just before it is recognized as the verification pattern, so the verification pattern itself is output as audio, and the latter has the disadvantage that it is difficult to change the timing of switching between data and audio. There is a drawback that.

〔the purpose〕

The purpose of the present invention is to eliminate these drawbacks by making it possible for the data transmitting side to mix audio and signals without audio interruption or special mode settings, and for the data receiving side to mix audio and signals without having to set a special mode. To make it possible to output audio without setting any unnatural audio interruptions or data interference.

〔Example〕

FIG. 1 is a block diagram of a transmitting section of the present invention.

1 is the audio input section, 2 is a delay circuit that creates a delay for T.

3 is a detector that detects the presence or absence of sound and outputs a signal if there is no sound for a certain period of time; 4 is based on the output of detector 3.

This is a control circuit that controls an analog switch 5 that switches audio/signals and a data generation source 6. FIG. 3 is a time chart explaining the operation of FIG. 1.

This operation will be explained below. Reference numeral 14 indicates an audio input signal input from the audio input section 1, and there is a no-signal time T2 between audio 15 and audio 16 in which no audio is input. The detector 3 detects the silent time of T2 and outputs a notification signal to the control circuit 4. Reference numeral 17 indicates the output signal of the delay circuit 2, and at the time when the notification signal is output from the detector 3 to the control circuit 4,
The audio signal 18 obtained by delaying the audio signal 15 is still being output.

(However, it shall be set so that TI>T2.)
After a period of time (T, -T,) has elapsed since receiving the notification signal, the control section 4 closes the analog switch 5 and simultaneously activates the data generation source 6. The data source 6 starts transmitting signals immediately after the audio signal source 18 ends,
The signal transmission ends within the time T2. The control circuit 4 detects this and reopens the analog switch 5. After that, the audio signal 19 continues, and as a result, as shown in 20, a signal is transmitted with data n stuck between the audio signals 21 and 22.

FIG. 2 is a block diagram of the receiving section of the present invention. 7 is an input section for a signal containing a mixture of audio and data, and 8 is a T.

Delay circuit that creates a delay, 9 is used for frame synchronization detection, etc.!
A detector detects that the redata has been transmitted and notifies the control unit 10 that the temperature has reached °C, and 10 is a control circuit that controls 11 analog switches based on the output of the detector 9.

12 is a data decoding circuit, and 13 is a speaker. Fourth
The figure is a time chart explaining the operation of FIG. 2. This operation will be explained below. Sae indicates a mixed audio and data signal input from the signal input section 7, and audio 5. It is composed of data 27 and audio signal 26. Now signal input section 7
When the audio signal 25 is inputted and the data 27 begins to be inputted, the detection circuit 9 detects this and notifies the control unit 10 of this. The feather indicates the output of the delay circuit 8, and at the time the detection circuit 9 outputs the notification signal to the control circuit 10, the signal 29, which is the delayed audio signal 5, is still being output. The control unit 10 receives the notification signal at T.

After the time has elapsed, the analog switch 11 is closed for the data transmission time T2, and then the switch is opened again.

As a result, the audio signal 33 and the remaining data 31 can be prevented from being transmitted from the speaker 13, as shown at 32.

Data can always be decoded by the decoding circuit 12 located before the analog switch.

〔effect〕

As explained above, according to the present invention, data can be inserted into the silent part between voices by simply adding a certain delay to the signal transmission, and as a result, the voice It is possible to mix data and voice without creating interruptions or special modes such as data transmission mode. - In receiving force signals,
By simply adding a certain delay to signal reception, the signal that is intervening between the voices can be removed from the audio output, without causing any unnatural interruptions in the audio, and in data reception mode. There is no need to provide a special mode.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a signal transmitting section of the present invention, FIG. 2 is a block diagram of a signal receiving section, and FIG. 3 is a signal transmitting unit block diagram of the present invention.
Figure 4 is a signal reception time chart. 1: Audio input section, 2, 8: Delay circuit, 3: Audio detector,
4.10: Control unit, 5.11: Analog switch. Fig. 1 Fig. 2 Fig. 3r''-:1 No. 40

Claims (1)

[Claims] In a system for transmitting audio and packetized data through a single transmission path, an audio delay circuit, an audio detection circuit, and a first switch section for switching between sending out the audio signal and the data signal are provided on the transmission side of the transmission path, By providing an audio delay circuit, a data detection circuit, and a second switch section on the receiving side to switch the received signal so that only the audio is output to the speaker using the output signal of the data detection circuit, it is possible to interrupt the data at the audio input terminal on the transmitting side. This allows transmission to be automatically interrupted by data without being aware of this, and the audio output terminal on the receiving side can output audio without causing unnatural audio interruptions or data sound interference. A data transmission method characterized by: