JPH05336049A - Voice coding decoding device - Google Patents

Abstract

PURPOSE:To conduct the operating test for a coder and a decoder without a built-in test pattern memory. CONSTITUTION:A digital tone signal outputted from a tone signal generator 17 is coded by a coder 3, a comparator 18 compares a local decoding data signal from the coder 3 with a digital tone signal resulting from decoding the coded data from the coder 3 at a decoder 6 to discriminate whether or not the contents of the data are coincident. Furthermore, the S/N of the local decoding data signal and of the digital tone signal outputted from the decoder 6 is respectively calculated by using an output of the tone signal generator 17 as a reference signal, and it is discriminated that whether or not the calculation result signal has a prescribed value or over to conduct the operation test of the coder 3 and the decoder 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice encoding / decoding device for performing an operation test of an encoder and a decoder built in a portable radio telephone or the like.

[0002]

2. Description of the Related Art FIG. 2 shows the configuration of a conventional speech encoding / decoding device. This device includes an A / D converter 2 for converting an analog audio signal from an input terminal 1 into a digital audio signal, an encoder 3 for outputting an audio data signal obtained by encoding a digital audio signal to an output terminal 4, and an input. A decoder 6 for decoding the audio data signal from the terminal 5 and converting it into a digital audio signal and a D / A converter 7 for converting the digital audio signal into an analog audio signal and outputting it to the output terminal 8 are provided.

Further, in this apparatus, an A / D pattern memory 9 for holding a predetermined digital audio signal sequence and an A / D pattern for performing an operation test of the encoder 3 and decoder 6 are provided.
Decoding pattern for holding the digital audio signal sequence obtained by encoding the digital audio signal sequence held in the pattern memory 9 by the encoder 3 during normal operation and encoding the output by the decoder 6 during normal operation A comparison is made between the memory 10 and the digital audio signal output from the decoder 6 and the contents of the data held in the decoding pattern memory 10, and a comparison result signal indicating whether or not the data match is output to the output terminal 12. A multiplexer 11 for selecting the A / D converter 2 or the A / D pattern memory 9 as an input of the encoder 3, and a multiplexer 14 for selecting an audio data signal from the input terminal 5 as an input of the decoder 6. Has been.

Next, the operation of this conventional configuration will be described. When carrying out the operation test of the encoder 3 and the decoder 6, the multiplexer 13 is set to the a side, and the encoder 3 encodes the digital audio signal sequence held in the A / D pattern memory 9. Then, the encoded voice data signal is transferred to the decoder 6 by setting the multiplexer 14 to the side a, and the decoder 6 decodes the encoded voice data signal into a digital voice signal. The comparator 11 compares the contents of this digital audio signal and the digital audio signal sequence held in the decoding pattern memory 10, and outputs the comparison result signal as 1-bit data from the output terminal 12.

In this way, the signal output from the output terminal 12 is monitored to determine the test result in the operation test of the encoder 3 and the decoder 6.

[0006]

However, in the case of the above-mentioned conventional speech coding / decoding apparatus, the A / D pattern memory 9 and the decoding pattern are used to test the operation of the encoder 3 and the decoder 6. The memory 10 is required, and there is a problem that the capacity of the memory is extremely increased in order to perform a sufficient operation test.

The present invention solves the problems in the prior art as described above. The operation test of the encoder and the decoder can be performed without incorporating a test pattern memory, and the processing scale is Excellent voice coding to reduce
It is intended to provide a decoding device.

[0008]

In order to achieve the above object, a voice encoding / decoding device of the present invention comprises an analog / digital conversion means for converting an analog voice signal into a digital voice signal, and an analog / digital conversion means. Coding means for coding the digital voice signal from the means to output a voice data signal and outputting a locally decoded data signal obtained in the process of obtaining the voice data signal; and a digital voice for decoding the coded voice data signal. Decoding means for outputting a signal, digital / analog converting means for converting a digital voice signal into an analog voice signal, tone signal generating means for generating a tone signal of a predetermined frequency within a voice band, locally decoded data signal and decoding means Compared with the digital audio signal output from to determine the data match, and output this determination result signal And the tone signal from the tone signal generating means is used as a reference signal to calculate the S / N ratios of the locally decoded data signal and the digital voice signal output from the decoding means, and output the calculation result. And a determination result signal output from the comparing means and the S / N ratio value output from the S / N calculating means, and outputs a determination result signal indicating whether the encoding means and the decoding means are operating normally. It is the structure provided with the determination means.

[0009]

With such a configuration, the speech coding / coding of the present invention
The decoding device is a locally decoded data signal obtained by encoding the tone signal from the tone signal generating means with an encoding means,
The encoded voice data signal from the encoding means is compared with the digital voice signal decoded by the decoding means to determine whether or not the contents of the data match, and further, the tone signal is used as a reference signal for decoding with the locally decoded data signal. Since the S / N ratio with the digital audio signal output from the means is calculated and it is determined whether or not the result of this calculation is a predetermined value or more, it is accurate without incorporating a test pattern memory. The operation test of the encoding means and the decoding means can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a voice encoding / decoding device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the configuration of the embodiment. In addition,
In the previous FIG. 2, the same components are designated by the same reference numerals.

In FIG. 1, a voice encoding / decoding device 2
2 is an A / D converter 2, an encoder 3, a decoder 6, a D / A converter 7, a multiplexer 15 and a multiplexer 16, a tone signal generator 17, a comparator 18, an S / N calculator 19,
It is composed of a judging device 20.

The A / D converter 2 and the encoder 3 are used for speech coding, and the decoder 6 and the D / A converter 7 are used for speech decoding. Further, the multiplexer 15 and the multiplexer 16, the tone signal generator 17, the comparator 18, the S / N calculator 19, and the determiner 20 are used for the operation test of the encoder 3 and the decoder 6.

The A / D converter 2 is adapted to convert the analog audio signal from the input terminal 1 into a digital audio signal, and the converted digital audio signal is the multiplexer 1.
5 is input to the b side. The digital tone signal output from the tone signal generator 17 is input to the a side of the multiplexer 15, and the multiplexer 15 outputs either the a or b side signal.

The encoder 3 encodes the signal from the multiplexer 15, and the encoded data is output to the output terminal 4 and the a side of the multiplexer 16.
Further, the encoder 3 outputs the locally decoded data signal obtained in the process of generating encoded data to the comparator 18 and the S / N calculator 19.

The input terminal 5 is provided on the b side of the multiplexer 16.
The coded voice data signal from is input to the multiplexer 16 which outputs either a or b side data.

The decoder 6 decodes the data from the multiplexer 16 into a digital voice signal or a digital tone signal, and outputs this to the comparator 18 and the S / N calculator 19. The D / A converter 7 converts the digital tone signal into an analog signal and outputs the converted analog signal from the output terminal 8.

The comparator 18 compares the locally decoded data signal and the decoded digital tone signal to determine whether the data match, and outputs the determination result signal to the determination unit 20. The S / N calculator 19 uses the output of the tone signal generator 17 as a reference signal to calculate the S / N ratios of the locally decoded data signal and the digital tone signal output from the decoder 6, respectively, and the result of this calculation is used as a determiner. It is designed to output to 20.

The judging device 20 uses the judgment result signal of the comparator 18 and the calculation result signal of the S / N calculator 19 to determine whether the comparator 18
It is determined whether or not the comparison in step 1 is coincident with each other and the calculation result signal of the S / N calculator 19 is equal to or more than a predetermined value, and the judgment result signal is output to the output terminal 21.

Next, the operation of the configuration of this embodiment will be described. When the operation test of the encoder 3 and the decoder 6 is performed, the multiplexer 15 is set to the a side, the digital tone signal output from the tone signal generator 17 is encoded by the encoder 3, and the encoded data is multiplexed. By setting 16 to the a side, it is transferred to the decoder 6. Then, the locally decoded data signal obtained when the encoder 3 encodes the digital tone signal is supplied to the comparator 18, and the digital tone signal decoded by the decoder 6 is supplied to the comparator 18, In 18, it is determined whether the two data match, and the determination result signal is output to the determiner 20.
At the same time, the output of the tone signal generator 17 is used as a reference signal to calculate the S / N ratios of the locally decoded data signal and the digital tone signal output from the decoder, and the calculation result signal is output to the decision unit 20.

Further, by using the judgment result signal of the comparator 18 in the judging device 20 and the calculation result signal of the S / N calculator 19, the comparison in the comparator 18 is coincident with each other, and the S / N calculator 19 It is determined whether or not the calculation result signal is equal to or more than a predetermined value, and the signal is output to the output terminal 21.

The contents of the operation test can be judged by monitoring the signal from the output terminal 21.

As described above, according to this embodiment, the comparator 1
8, the locally decoded data signal from the encoder 3 and the digital tone signal from the decoder 6 are compared to determine whether or not the data contents match, and the output of the tone signal generator 17 is used as a reference signal. As the S / N ratio of the locally decoded data signal and the digital tone signal output from the decoder 6, the S / N ratio is calculated, and it is determined whether or not the calculation result signal is equal to or more than a predetermined value, and the encoder 3 and the decoder 3 Since the operation test of the encoder 6 is performed, the operation test of the encoder 3 and the decoder 6 can be performed without incorporating the A / D pattern memory and the decoding pattern memory. The cost of the components can be reduced, and the built-in test pattern memory described above is not required, and the processing scale can be reduced.

[0024]

As is apparent from the above description, the speech encoding / decoding apparatus of the present invention is capable of decoding a locally decoded data signal obtained when the digital tone signal is encoded by the encoding means and the decoding means. The data is compared with the decoded digital tone signal, and the output of the tone signal generating means is used as a reference signal to calculate the S / N ratios of the locally decoded data signal and the digital tone signal output from the decoding means. Since the operation test of the decoding means is performed, it is possible to perform the operation test of the encoding means and the decoding means without incorporating the memory for the test pattern, and it is possible to reduce the component cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an audio encoding / decoding device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional speech encoding / decoding device.

[Explanation of symbols]

 1 Input Terminal 2 A / D Converter 3 Encoder 4 Output Terminal 6 Decoder 7 D / A Converter 8 Output Terminals 15, 16 Multiplexer 17 Tone Signal Generator 18 Comparator 19 S / N Calculator 20 Judgmenter 21 Output Terminal 22 Speech coding / decoding device

Claims (1)

[Claims] 1. An analog / digital converting means for converting an analog audio signal into a digital audio signal, and a step of encoding a digital audio signal from the analog / digital converting means to output an audio data signal and obtaining an audio data signal. And a decoding means for decoding the encoded voice data signal and outputting a digital voice signal, and a digital / analog conversion means for converting the digital voice signal into an analog voice signal. And a tone signal generating means for generating a tone signal of a predetermined frequency in the voice band, and a locally decoded data signal and a digital voice signal output from the decoding means are compared to determine data match, and this determination result signal And the local decoding data using the tone signal from the tone signal generating means as a reference signal. The S / N ratio between the data signal and the digital audio signal output from the decoding means,
From the S / N calculating means for outputting this calculation result, the judgment result signal output from the comparing means, and the S / N ratio value output from the S / N calculating means, the encoding means and the decoding means operate normally. A voice encoding / decoding device comprising: a determination unit that outputs a determination result signal indicating whether or not it is operating.