JPH02215227A - Test equipment for voice coder - Google Patents

Abstract

PURPOSE:To test a voice coder by encoding a tone signal with a frequency for the reply to a tone signal, sending it to a 1st voice coder, and decoding and identifying the tone signal with the voice coder. CONSTITUTION:A tone identification circuit 12 of a voice coder receiving a command of test start measures the power and frequency of the tone signal and when the tone signal is discriminated to be correct, the circuit 12 outputs code information corresponding to the frequency of the tone signal, that is, the code information to reply the test start to a control circuit 13. The circuit 13 uses the code information to output a test result signal representing that the voice coder is normal and stops the output of an in-test signal. On the other hand, when the code information is not inputted for a prescribed time, the circuit 13 outputs a test result signal representing that the voice coder is faulty. Thus, the tone signal is sent and received through a channel for a voice signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a test device for testing the operation of a speech encoder.

BACKGROUND OF THE INVENTION FIG. 2 shows a conventional speech encoder testing device, which is provided in each speech encoder that bidirectionally transmits and receives speech encoded signals.

In FIG. 2, a circuit a indicated by a broken line is a test device. It is roughly constructed of a power measurement circuit 2 for measuring the power of a signal, and a control circuit 3 for controlling an operation test of a speech encoder as described later.

In FIG. 2, when a test start command is input, the control circuit 3 outputs a test start signal to the other party's audio encoder via a channel different from the channel for encoded audio data, and The signal switch 4 is controlled so that the sine wave signal from the one sine wave oscillation circuit 1 is input to the A/D converter 5.

Therefore, the sine wave signal from the single sine wave oscillation circuit 1 is converted into a digital signal by the A/D converter 5, encoded by the encoder 6, and transmitted to the voice encoder of the other party. , and is decoded by the D/A converter 8 and restored to the original sine wave signal.

The control circuit 3 on the other side controls the signal switch 4 so that the original sine wave signal is input to the A/D converter 5 using the test start signal.

Therefore, the sine wave signal from its own single sine wave oscillation circuit 1 is returned to the voice encoder that has been instructed to start the test by being looped back by the voice encoder on the other side, and the power measurement is performed. By measuring the power of the sinusoidal signal, the circuit 2 can test whether the speech encoder is operating normally.

In addition, when ending the test, the control circuit 3 of the voice encoder that has been instructed to start the test communicates with the voice encoder of the other party via a channel different from the channel for encoded voice data. The signal switch 4 is controlled so that the test end signal is output and the analog audio signal is input to the A/D converter 5, and the control circuit 3 of the other party's audio encoder receives this test end signal. Then, the analog audio signal becomes A
The signal switch 4 is controlled to input the signal to the /D converter 5.

Problems to be Solved by the Invention However, in the above-mentioned conventional audio encoder testing device, test start signals and the like are transmitted and received through a channel different from the channel for audio encoded data. There is a problem in that a channel and a channel for control signals are required.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a speech encoder testing device that is capable of transmitting and receiving a test start signal and the like using only a channel for speech signals.

Means for Solving the Problems In order to achieve the above object, the present invention encodes a tone signal of a frequency for starting a test from a first voice encoder that has been instructed to start a test, and transmits it to the other party's first voice encoder. If the second audio encoder decodes and identifies this tone signal, it encodes the tone signal at a frequency for a response to this tone signal and transmits it to the first audio encoder. The first speech encoder decodes and identifies this tone signal, thereby testing the speech encoder.

According to the above configuration, the present invention transmits and receives a tone signal at a frequency for starting a test of a voice encoder and a tone signal at a frequency for responding to this tone signal through a channel for voice signals. Therefore, test start signals and the like can be transmitted and received using only the audio signal channel.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a speech encoder testing device according to the present invention, and the same components as those shown in FIG. 2 are given the same reference numerals.

In FIG. 1, reference numeral 11 denotes a tone generation circuit that generates tone signals of a plurality of different frequencies according to code information for starting a test of the speech encoder and code information in response to the start of the test; , a tone identification circuit that identifies tone signals of each frequency from the tone generation circuit 11 of the other party; 13 indicates a test start command and a tone identification circuit 1;
When the tone identification signal (code information) from 2 is input,
As described later, this is a control circuit that performs test control of the speech encoder by outputting a signal indicating that a test is in progress, a signal indicating a test result, and a signal indicating code information for the tone generating circuit 11. Circuits 11 to 13 constitute test apparatus A.

In addition, 4a receives an analog audio signal or a tone generating circuit 1 of the test device A under the control of the control circuit 13 of the test device A.
A signal switch 5 outputs the tone signal from the signal switch 4a, and an A/5 converts the output signal of the signal switch 4a into a digital signal.
A D converter 6 is an encoder that encodes the digital signal from the A/D converter 5 and outputs the encoded data to the audio encoder of the other party, and 7 is an audio encoder of the other party. The decoder 8 that decodes the encoded data from the decoder 7 is a D/A converter that converts the decoded signal from the decoder 7 into an analog signal,
The circuits 11 to 13 can bidirectionally transmit and receive encoded audio signals, and each audio encoder is provided with a test device A, respectively.

Next, the operation of the above embodiment will be explained.

In FIG. 1, when a test start command is input, the control circuit 13 outputs code information corresponding to the test start to the tone generation circuit 11, and the tone signal from the tone generation circuit 11 is sent to the A/D converter 5. The signal switch 4a is controlled to input the signal, and also outputs a signal indicating that the test is in progress.

Therefore, when the tone generation circuit 11 generates a tone signal of a frequency corresponding to the code information, this tone signal is converted into a digital signal by the A/D converter 5,
The coded data is encoded by the encoder 6 and transmitted to the voice encoder of the other party, and this encoded data is decoded by the decoder 7 of the voice encoder of the other party and sent to the D/A converter 8. is converted to the original tone signal by

The tone identification circuit 12 of the voice encoder on the other end measures the power and frequency of this tone signal and, when determining that it is a correct tone signal, generates code information corresponding to the frequency of the tone signal, that is, code information corresponding to the start of the test. is output to the control circuit 13.

Based on this code information, the control circuit 13 of the speech encoder on the other party outputs code information for responding to the test start to the tone generation circuit 11, and also outputs the code information for responding to the start of the test to the tone generation circuit 11.
The signal switch 4a is controlled so that the tone signal from 1 is input to the A/D converter 5, and a signal indicating that the test is in progress is output.

Therefore, when the tone generation circuit 11 generates a tone signal with a frequency corresponding to the code information, this tone signal is converted into a sidigital signal by the A/D converter 5,
The data encoded by the encoder 6 is transmitted to the voice encoder that has been instructed to start the test, is decoded by the decoder 7 of the voice encoder on the other side, and converted into the original tone signal by the D/A converter 8. converted.

Tone discrimination circuit 1 of the speech encoder where test start is commanded
2 measures the power and frequency of this tone signal and, when determining that it is a correct tone signal, outputs code information corresponding to the frequency of the tone signal, that is, code information for responding to the start of the test, to the control circuit 13. do.

The control circuit 13 of the speech encoder, which is instructed to start the test,
This code information outputs a test result signal indicating that the audio encoder is normal and stops outputting the signal during the test.On the other hand, if this code information is not input within a predetermined time after the test starts, , outputs a test result signal indicating that the speech encoder is abnormal.

Therefore, according to the above embodiment, a tone signal with a frequency corresponding to the start of a test and a tone signal with a frequency corresponding to a response to the start of a test can be transmitted and received only through the audio signal channel.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention encodes a tone signal of a frequency for starting a test from a first speech encoder that has been instructed to start a test, and transmits the signal to a second speech encoder on the opposite side. If the second audio encoder decodes and identifies this tone signal, it encodes a tone signal with a frequency for a response to this tone signal and transmits it to the first audio encoder, The first speech encoder decodes and identifies this tone signal to test the speech encoder. A tone signal of a frequency for responding to a signal can be transmitted and received via the audio signal channel, and therefore a test start signal and the like can be transmitted and received only through the audio signal channel.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a speech encoder testing device according to the present invention, and FIG. 2 is a block diagram showing a conventional speech encoder testing device. 4a... Signal switcher, 5... A/D converter, 6...
- Encoder, 7... Decoder, 8... D/A converter, 1
1... Tone generation circuit, 12... Tone identification circuit 2
．． 13...Control circuit.

Claims (1)

[Claims] Generates a tone signal at a frequency to start testing the voice encoder and a tone signal at a frequency to respond to the tone signal for each voice encoder that bidirectionally transmits and receives voice encoded signals. A tone generation circuit for detecting a tone signal and a tone identification circuit for identifying a tone signal from a tone generation circuit on the other side are provided, and a tone signal having a frequency for starting a test is generated from a first voice encoder that is instructed to start a test. When the tone signal is encoded and transmitted to a second voice encoder at the other end, and the second voice encoder decodes and identifies this tone signal,
A tone signal having a frequency in response to this tone signal is encoded and transmitted to a first speech encoder, and the first speech encoder decodes and identifies this tone signal, thereby controlling the speech encoder. A test device for a speech encoder, characterized in that it tests.