JPS5897952A - Simultaneous signal transmission system for voice, data or the like - Google Patents

Abstract

PURPOSE:To transmit successive signals of voice and data, etc., simultaneously without spoiling line quality, by using delay circuits on a transmission and a reception side and comparessing and stretching voice codes. CONSTITUTION:On a transmission side, the transmission of a voice signal is stopped during the transmission of data, etc., to send out only data, etc., and the voice signal during the period is allowed to stand by through a delay circuit 1 whose delay time is decreased gradually from data length and is reduced to zero a prescribed time later; and the stand-by voice signal compressed for the time corresponding to the data length after the transmission of the data, etc., ends and sent out. On a reception side, the compressed voice signal is separated from the data, etc., and then time-expanded by a delay circuit 5 whose delay time increases gradually from zero and attains the data length a prescribed time later, thus regenerating the successive voice signal.

Description

Detailed Description of the Invention The present invention utilizes one audio line to transmit audio signals and data signals (hereinafter referred to as data), and when each signal is transmitted, two signals are simultaneously transmitted with almost the same transmission quality. Regarding the transmission method that has been made possible.

Conventionally, when simultaneously transmitting data on one line without expanding the line band, there are two methods: one is a serial system that separates audio and data transmission by time, and the other is a serial system that separates the line band and transmits data at a transmission level of t- for each signal. There was a parallel method that lowered the number to 11.

However, among these methods, the serial method has the drawback that the audio signal's data is cut off each time data is generated, making the audio content unclear, and the parallel method has the disadvantage that the data is cut off each time data is generated, and the parallel method has the disadvantage that the data is cut off each time data is generated, and the parallel method is subject to bandwidth limitations for each signal. For voice, the intelligibility deteriorates, and for data, the data transmission speed is forced to decrease.At the same time, the transmission level per signal has to be noisier than in the case of one signal, so-called transmission S
There was a drawback that the lowering of the level lowered the edge, resulting in deterioration of the line quality.

An object of the present invention is to provide a system for simultaneously transmitting signals such as voice and data, which compensates for the drawbacks of the above two systems.

In order to achieve the above object, the present invention provides a method for transmitting signals such as voice and data simultaneously. Then, when transmitting the data, etc., the transmission of the audio signal is stopped and only the data, etc. are transmitted, while the delay time amount of the audio signal is gradually decreased from the data essential point, and it becomes OK after a predetermined time. The audio signal is put on standby by an operating delay circuit, and after the transmission of data, etc. is completed, the audio signal that has been put on standby is compressed by the time required for the data and sent out, and on the receiving side, the compressed audio signal is branched into data, etc. After that, the amount of delay time gradually increases from O, and the time is extended by a delay circuit that operates to reach the data length over a predetermined time, thereby reproducing a continuous audio signal.

According to the above-mentioned method, the necessary transmission band becomes wide due to the compression of audio, or the audio band is limited if the band is constant. However, if the compression ratio is set to less than 100, the deterioration of clarity due to band limitation will hardly occur. Note that data and the like are not affected by the time compression/expansion of audio. Therefore, simultaneous transmission of voice, data, etc. is possible without degrading transmission quality.

Hereinafter, the system of the present invention will be explained in more detail with reference to the drawings.

FIG. 131 is a circuit block diagram showing an embodiment of the transmitter side of the data transmission method according to the present invention.

A variable delay circuit 1 is provided as a circuit for continuously delaying audio input from a data time point to 0, and a data detection circuit 3t is provided as a circuit for detecting data input. The output of the data detection circuit 3 is input to a delay control circuit 2 which generates a signal that changes the amount of delay of the variable delay circuit 1. The delayed voice and data are combined by a combining circuit 4 and transmitted to a receiving device, which will be described later.

The data conditions handled by this method are: Data length: td constant Data interval: 1D or more t%. ratio
・・・・・・・・・ Below the convergence.

In the time chart of the transmitter shown in FIG. 2, at tl4 when the first data is input, the delay Fi of the variable delay circuit 1 is
o, so the audio is output as is.

At 1 when data is input, the delay amount of variable delay circuit 1 is controlled as circuit 3 → 2 → 1 and multiplies from 0 → td, so between 0 and lt! between the audio cover td of variable delay circuit 1! At the time point 11 and subsequent audio inputs appear at the variable delay circuit 1 output.

At the same time, under the control of the delay control circuit 2, the delay amount of the variable delay circuit 1 gradually decreases from talb, and it takes tD time, which is OK. As a result, the audio input Hta is compressed for time t1 to tl=tD and is sent out in time (tD-ta). From tl until the next data input is 21t4, the input is output as is without delay, and after t4, the operation is the same as from tl described above.

As a result, while the input audio is input to the output of the variable delay circuit 1, a gap occurs, and the data is compressed by the amount of time during which the gap occurs and is applied to the synthesis circuit 4. 4, the signal is inserted into the audio gap and output.

Here, if the data detection signal is obtained from the data generation side as a data output signal, the data detection circuit 3 can be omitted.

In this case, the data sending signal is connected to the delay control circuit 2 as shown by the dotted line.

Next, the receiving device will be explained.

Figure 3 also shows an embodiment on the receiving device side.
J) A variable delay circuit whose delay time is controlled so that the audio and data inputs transmitted by the aforementioned transmitting device are branched and the delay time of the audio has an opposite characteristic to that of the variable delay circuit 1 of the transmitting device. Enter 5iC.

The one-sided force data signal is detected by the same data detection device i7 as the transmitting device 3, and its output is input to the delay control circuit 6 which generates a signal that changes the amount of delay of the variable delay circuit 1.

The delay control circuit 6 has characteristics opposite to those of the delay control circuit 2 in the transmitting device, and starts operating at the falling edge of the output of the data detection circuit 7.

As shown in the time chart of FIG. 4, the operation of this device is such that data is detected by the data detection circuit 7, and the variable delay circuit 5Fit4 is delayed by the control of the delay control circuit 6 during the falling edge of the data (trl). Therefore, the input audio is output from the variable delay circuit 5 with a delay of t4 time from to to tl. Next, at the time t8, the delay amount Fita of the variable delay circuit 5 becomes 0 as described above, so that the output of the variable delay circuit 5 is more than that at the time t2 of the audio input. The data signal was inserted by this operation.
1~t! The gap is eliminated, and the data signal inserted into the audio in the input signal does not appear at the output of the variable delay circuit 5, and the audio from t2 following tl is output from the variable delay circuit 5 in a continuous form. become.

At the same time, the delay amount of the variable delay circuit 5 is 1! under the control of the delay control circuit 6! It gradually increases from time 0 and returns to the original 14 hours after tB time. This delay increase characteristic is opposite to the delay decrease characteristic of the delay control circuit of the transmitter, so the input audio that has been processed with the delay decrease characteristic by the transmitter has its respective characteristics changed by the delay increase characteristic process of the receiver. The delay is constant due to cancellation (in this case, when the input audio in the transmitter is used as a reference, the delay in the audio output of this receiver is ta)
output at a constant value).

Also, the time is compressed by td on the transmitting device side (tD~td
) The voice section/interval is t- as a tp section by this receiving device.
The signal is expanded by minutes and restored to the original audio signal.

By giving the delay control circuit a delay amount gradually increasing/decreasing sweep characteristic, this device can transmit data without any restriction on the number of data to be transmitted as long as the condition of side monitor sending interval≧sweep time is satisfied. In addition, no matter how many pieces of data there are, the amount of voice delay remains constant (ta), so even when voice calls are made between transmission sections, there is almost no unnaturalness in the call due to delay.

As described above in detail, according to the present invention, continuous signals such as voice and data can be transmitted simultaneously without the need for line quality control equipment.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing an embodiment of a transmitting device configured according to the method of the present invention, FIG. 2 is a time chart for explaining the operation of the transmitting device, and FIG. FIG. 4 is a circuit block diagram showing the embodiment and is a time chart for explaining the operation of the receiving side device. 1.5...Variable delay circuit 2,6...Delay control circuit 3.7...Data detection circuit Patent applicant Hisashi Inoro, agent for NEC Corporation, patent attorney

Claims (1)

[Claims] In a transmission method that simultaneously transmits voice and signals such as data that occur intermittently using one voice line, on the transmitting side, when transmitting the data, etc., the transmission of the voice signal is stopped and only the data, etc. is transmitted. On the other hand, the delay time of the audio signal during that time gradually decreases from the data point and reaches zero after a predetermined time.
After the sending of the data, etc. is completed, the audio signal that has been put on standby is compressed by the data length, minutes, and sent out, and the receiving side receives the compressed audio signal. , data, etc., the amount of delay time gradually increases from 0, and the time is expanded by a delay circuit that operates so that the data length is reached in a predetermined time, and a continuous audio signal is reproduced. A method for simultaneously transmitting signals such as voice and data.