JPH03117214A - Voice coding/decoding device - Google Patents

Abstract

PURPOSE:To execute the operating test of a coder and a decoder without any incorporated memory by comparing a local decoding data obtained from the coder with a digital voice signal resulting from a coded voice data decoded by the decoder and deciding the coincidence. CONSTITUTION:An output terminal 16 and an input terminal 17 are connected in the case of conducting the operating test for a coder 15 and a decoder 18. Then a coded voice data of the coder 15 is transferred to the decoder 18 via the output terminal 16 and the input terminal 17. A local decoding data obtained when a voice data is coded by the coder 15 is fed to a comparator circuit 21 and also a digital voice signal decoded by the decoder 18 is fed to the comparator circuit 21. Then the comparator circuit 21 decides the coincidence of both the data and the result of decision is outputted from an output terminal 22. The content of the operating test of the coder and the decoder is decided by monitoring the output signal.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a speech encoding/decoding device, and in particular to a conventional speech encoding/decoding device suitable for testing the operation of encoders and decoders. As a known converting device, the one shown in FIG. 2 is known. This device includes an A/D converter 2 that converts an analog audio signal from an input terminal 1 into a digital audio signal,
An encoder 3 that encodes a digital audio signal and outputs the audio data to an output terminal 4, a decoder 6 that decodes audio data from an input terminal 5 and converts it into a digital audio signal, and converts the digital audio signal into an analog audio signal. The circuit includes a D/A converter 7 which converts the data into a D/A converter and outputs the converted data to an output terminal 8. Furthermore, this device includes an A/D/< turn memory 9 that holds a predetermined digital audio signal sequence, and an A/D turn memory 9 for carrying out an operation test of the encoder 3 and decoder 6.
Decoding in which the digital audio signal string held in the D pattern memory 9 is encoded by the encoder 3 during normal operation, and the output thereof is decoded by the decoder 6 during normal operation, and the obtained digital audio signal string is held. pattern memory 10,
A terminal 12 compares the digital audio signal output from the decoder 6 with the contents of the data held in the decoding pattern memory 10, and outputs the comparison result as to whether the data match or not.
A comparison circuit 11 is provided for outputting an output to.

When performing an operation test of the encoder 3 and decoder 6 in the above device, connect the output terminal 4 and the input terminal 5, and connect the A/D
The digital audio data held in the pattern memory 9 is encoded by the encoder 3. This encoded data is then transferred to a decoder 6 via an output terminal 4 and an input terminal 5, and the decoder 6 decodes the audio data into a digital audio signal.

Comparison circuit 11 compares the content of this digital audio signal with the digital audio signal string held in decoding pattern memory 10, and outputs the comparison result from output terminal 12 as 1-bit data. Therefore, by monitoring the signal output from the output terminal 12, the test results of the operation test of the encoder 3 and decoder 6 can be determined.

[Problem to be solved by the invention] However, in the case of the above-mentioned conventional device, an A/D pattern memory 9 and a decoding pattern memory 10 are required to perform an operation test of the encoder 3 and decoder 6. However, incorporating these memories for operation tests increases costs. Furthermore, if a sufficient number of tests are to be performed, the memory capacity will be enormous.

SUMMARY OF THE INVENTION An object of the present invention is to provide a speech encoding/decoding device capable of testing the operation of an encoder and a decoder without incorporating a memory.

[Means to solve the problem]

To achieve the above object, the present invention provides an analog/digital converter for converting an analog audio signal into a digital audio signal, and an analog/digital converter for encoding the digital audio output output from the analog/digital converter to output audio data. An encoder that outputs locally decoded data obtained in the process of obtaining audio data, a decoder that decodes the encoded audio data and outputs a digital audio signal, and a digital/digital audio signal that converts the digital audio signal into an analog audio signal. An audio encoding/decoding device comprising an analog converter and a comparison circuit that compares the locally decoded data and a digital audio signal output from the decoder to determine whether the data match, and outputs the determination result. It is composed of

[Effect]

Therefore, according to the present invention, local decoded data obtained from an encoder is compared with a digital audio signal obtained by decoding encoded audio data from the encoder using a decoder, and whether or not the data contents match is determined. This makes it possible to test the operation of the encoder and decoder without incorporating memory.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, the audio encoding/decoding device 23 includes an A/D converter 14, an encoder 15, a decoder 18, and an A/D converter 19.
, a comparison circuit 21, and an A/D converter 14.
, encoder 15 is used for audio encoding, decoder 18, A
/D converter 19 is used for audio decoding, and comparison circuit 21
is used for testing the operation of the encoder 15 and decoder 18.

The A/D converter 14 converts the analog audio signal from the input terminal 13 into a digital audio signal,
The decoder 15 decodes the digital audio signal and outputs the decoded audio data to the output terminal 16. Furthermore, the encoder 15 outputs locally decoded data obtained in the process of obtaining audio data to the comparator circuit 21.

The decoder 18 decodes the encoded audio data from the input terminal 17, converts it into digital audio data, and outputs this digital audio signal to the D/A converter 19 and the comparison circuit 21. The A/D converter 19 converts the digital audio signal into an analog audio signal, and outputs the converted analog audio signal from the output terminal 20. The comparison circuit 21 compares the locally decoded data and the digital audio data to determine whether the data match, and outputs the determination result from the output terminal 22.

In the above configuration, when performing an operation test of the encoder 15 and the decoder 18, the output terminal 16 and the input terminal 17 are connected, and the encoded audio data of the encoder 15 is transmitted to the output terminal 16,
It is transferred to the decoder 18 via the input terminal 17. The local decoded data obtained when the encoder 15 encodes the audio data is supplied to the comparison circuit 21, and the digital audio signal decoded by the encoder 18 is supplied to the comparison circuit 21. It is determined whether the two data match, and the determination result is output from the output terminal 21. The content of the operation test is determined by monitoring the signal from the output terminal 22.

As described above, according to this embodiment, since the operation test of the encoder 15 and the decoder 18 is performed by comparing the locally decoded data and the digital audio signal in the comparator circuit 21, the A/
The operation of the encoder 15 and decoder 18 can be tested without incorporating a D pattern memory or a decoding pattern memory. Therefore, it is possible to contribute to a reduction in component costs.

〔Effect of the invention〕

As explained above, according to the present invention, the local decoded data obtained when the encoder encodes the audio data is compared with the digital audio signal obtained by decoding the encoded audio data by the decoder, and the encoder Since the decoder is tested for operation, it is possible to test the operation of the encoder and decoder without incorporating a memory, which contributes to reducing component costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a speech encoding/decoding device showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional speech encoding/decoding device. 13.17...Input terminal, 14...A/D converter, 5...Encoder, 6.20.22...Output terminal, 8...Decoder, 9...D/ A converter, 1... Comparison circuit, 3... Audio encoding/decoding device.

Claims (1)

[Claims] An analog/digital converter that converts an analog audio signal into a digital audio signal, and encodes the digital audio output of the analog/digital converter to output audio data, as well as locally decoded data obtained in the process of obtaining the audio data. a decoder that decodes the encoded audio data and outputs a digital audio signal, a digital/analog converter that converts the digital audio signal into an analog audio signal, and a decoder that outputs the locally decoded data. An audio encoding/decoding device comprising a comparison circuit that compares a digital audio signal output from a digital audio signal from a digital audio signal to determine whether data matches, and outputs the determination result.