JPH03216022A - Voice encoder/decoder - Google Patents

Abstract

PURPOSE:To easily confirm the normality of this encoder/decoder at test and at normal use by selecting either a coded signal or a test signal, applying the signal to a decoding section and monitoring the output of a coding section. CONSTITUTION:A 1st selective section 1 is controlled to select the output of a decoding section 4 and a 2nd selective section 5 is controlled to select the output of a test signal generating section 6 at test, a test signal from the test signal generating section 6 is decoded by the decoding section 4 and coded by a coding section 2 via the selective section 1 and a test signal is correctly decoded by a monitoring section 3, which monitors whether the test signal is correctly decoded or coded. Moreover, at usual use, the selective section 1 is controlled to select a voice input signal and the selective section 5 is controlled to select the coded reception signal and the monitoring section 3 defects the abnormality of the unchanged state in the output of the coding section 2. Thus, at the test and at the normal use, the confirmation of the normality of the encoder/decorder is easily implemented.

Description

[Detailed Description of the Invention] [Summary] An object of the present invention is to easily confirm the normality of an audio encoding/decoding device with a simple configuration during testing and normal use. In an audio encoding/decoding device that includes an encoding unit that inputs and encodes an audio signal, and a decoding unit that decodes the encoded signal and outputs it as an audio signal, the audio input signal and a first selection section that selects one of the outputs of the decoding section and applies it to the encoding section; a test signal generation section that generates a test signal; and a code to be input to the decoding section. a second selection unit that selects either the converted signal or the test signal and applies it to the decoding unit;
and a monitoring section that monitors the output of the encoding section.

[Industrial application field] The present invention relates to a speech encoding/decoding device.

In a system that transmits an audio signal, the audio signal is converted into an analog audio signal by an audio encoding/decoding device.
/D conversion, encoded and transmitted, and the received signal is decoded,
It is D/A converted and output as an analog audio signal.

Even in such audio signal transmission systems, there is a need to monitor abnormalities within the system and minimize system outages.
There has also been a demand for technology for self-monitoring of the decoding device itself.

[Prior art and problems to be solved by the invention] Conventionally, when testing the normality of an audio encoding/decoding device, an analog test signal is input from an audio signal input terminal, and the A/D The output of the converting section is loop-packed and inputted to the D/A converting section, or the output of the encoding section is looped back and the decoding section is manually operated to detect the corresponding audio output.

Therefore, in order to perform the above-mentioned test, a device that generates an analog test signal and a device that detects an analog audio output signal are required, making the test device large-scale and the procedure complicated. The problem was that it couldn't be tested. The present invention has been made in view of the above-mentioned problems.It is an object of the present invention to provide an audio encoding/decoding device that has a simple configuration and can easily confirm the normality of the device during testing and normal use. The purpose is to

[Means to solve the problem] FIG. 1 is a basic configuration diagram of the present invention.

In FIG. 1, 1 is a first selection section, 2 is an encoding section, and 3 is a first selection section.
is a monitoring unit, 4 is a decoding unit, 5 is a second selection unit, and
6 is a test signal generator.

The encoding unit 2 receives and encodes the audio signal.

The decoding unit 4 decodes the encoded signal and outputs it as an audio signal.

The first selection section 1 selects either the audio input signal or the output of the decoding section 4 and applies it to the encoding section 2 .

The test signal generator 6 generates a test signal.

The second selection section 5 selects either the encoded signal to be input to the decoding section 4 or the test signal and applies the selected signal to the decoding section 4 .

A monitoring section 3 monitors the output of the encoding section 2.

[Effect]

During testing, the first selection section 1 is controlled to select the output of the decoding section 4, and the second selection section 5 is controlled to select the output of the test signal generation section 6.

As a result, the test signal from the test signal generation section 6 is input to the decoding section 4, decoded, passed through the first selection section 1, encoded at the encoding section 2, and then at the monitoring section 3.
It is monitored whether the above test signal is correctly decoded and encoded. Since it is sufficient to generate a known digital pattern signal as the test signal, the circuit scale of the test signal generating section 6 can be made very small, and the results of decoding and encoding the digital pattern signal are already known. Similarly, the circuit scale of the monitoring section 3 that detects this can be made very small.

Also, during normal use of the audio encoding/decoding device, the first
The selection unit 1 is controlled to select the audio input signal, and the second selection unit 5 is controlled to select the encoded received signal. At this time, too, the monitoring unit 3 controls the Obvious abnormalities such as no change in the output of the converter can be detected.

〔Example〕

FIG. 2 is a configuration diagram of an embodiment of the present invention.

In FIG. 2, 11 and 17 are selectors, 12 is A
/D conversion circuit, 13 is an encoding circuit, 14 is a monitoring circuit, 1
5 is a D/A conversion circuit, 16 is a decoding circuit, and 18
is a test signal generation circuit.

In the configuration shown in FIG. 2, the selector 11 is connected to the first selection section 1 shown in FIG. 1, the selector 17 is connected to the second selection section 5 shown in FIG. The encoding unit 2 in FIG. 1 includes a decoding circuit l6 and a D/A conversion circuit 1.
5 corresponds to the decoding section 4 of FIG. 1, the monitoring circuit 14 corresponds to the monitoring section 3 of FIG. 1, and the test signal generating circuit 18 corresponds to the test signal generating section 6 of FIG. 1, respectively. Selector 11
The TEST signal inputted to 17 and 17 as a control signal performs the same selection control as that of the first and second selection sections 1 and 5.

FIG. 3 is an explanatory diagram of the operation in the configuration of FIG. 2.

In the embodiment of the present invention, the test signal generating circuit 18 in FIG. 2 repeats a digital pattern similar to that in which a sine wave is encoded in the encoding circuit 13 in FIG. 2 (with the period of the sine wave). Output.

Since the sine wave periodically repeats positive and negative, the above test signal is passed through the route of the decoding circuit 16, the D/A conversion circuit 15, the selector 11, the A/D conversion circuit 12, and the encoding circuit 13. , A/D converted, and the most significant bit of the encoded output (indicating the positive/negative of the signal) becomes a rectangular signal that repeats positive/negative, as shown in FIG.

In the monitoring circuit 14, by using the output of the encoding circuit 13 as a trigger input of a monostable circuit (not shown),
If some abnormality occurs in the above route and a rising edge is not input as the trigger input of the monostable circuit at the above period as shown in Figure 3, the output of the monostable circuit becomes an alarm level and the abnormality is detected. be done.

In addition, since normally both the voice signal and the noise signal change alternately positive and negative around the O level, when an abnormality occurs in the encoding circuit 13 when using a normal voice encoding/decoding device, the encoding circuit 13 When the most significant bit of the output of is fixed to either positive or negative, it becomes possible to detect this abnormality using a monostable circuit as in the test.

[Effects of the Invention] According to the speech encoding/decoding device of the present invention, the normality of the device can be easily confirmed with a simple configuration during testing and normal use.

[Brief explanation of drawings]

FIG. 1 is a basic block diagram of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation in the embodiment of the present invention. [Explanation of symbols] 1-first selection unit, 21-encoding unit, 3-monitoring unit, 4-.
decoding section, 5--second selection section, 6--test signal generation section, 11.17--selector, 12-A/D conversion circuit, l3-encoding circuit, 14-monitoring circuit, 1 5-D/
A conversion circuit, 16-decoding circuit, 18-test signal generation circuit. 2nd block diagram of an embodiment of the present invention; 3rd diagram explaining operation in an embodiment of the present invention! l

Claims (1)

[Claims] 1. An encoding unit (2) that inputs and encodes an audio signal, and a decoding unit (4) that decodes the encoded signal and outputs it as an audio signal. A first selection unit (1) that selects either an audio input signal or an output of the decoding unit (4) and applies the selected one to the encoding unit (2). a test signal generating section (6) that generates a test signal; and a decoding section that selects either one of the encoded signal to be input to the decoding section (4) and the test signal. (4); and a monitoring unit (3) that monitors the output of the encoding unit (2). Device.