Voice encoding/decording device and method therefor

A speech decoding and speech encoding technology, applied in speech analysis, code conversion, instrumentation, etc., can solve problems such as unnaturalness, lower average bit rate, and deterioration of decoded speech quality

Inactive Publication Date: 2002-08-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0011] In the above-mentioned existing speech coding device, only the voiced interval is coded by the CS-ACELP speech encoder, and the silent interval (the interval with only noise) is encoded by a dedicated silent interval encoder at a bit rate lower than that of the speech encoder , so that the average bit rate of the transmission is reduced
[0012] However, when an audio signal superimposed with surrounding background noise is input as an input signal, the quality of the decoded audio deteriorates due to the influence of the superimposed background noise in the voiced interval.
In addition, since noise is generated in the unvoiced interval using data encoded differently from the voiced interval, the auditory quality of the background noise in the decoded speech in the voiced interval is different from that generated in the unvoiced interval, resulting in unnaturalness. sense

Method used

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  • Voice encoding/decording device and method therefor
  • Voice encoding/decording device and method therefor
  • Voice encoding/decording device and method therefor

Examples

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Embodiment 1

[0027] image 3 is a block diagram showing the configuration of a wireless communication device including the speech encoding / decoding device according to Embodiment 1 of the present invention. In this wireless communication device, at the transmitting end, voice is converted into an electrical analog signal by a voice input device 101 such as a microphone, and output to an A / D converter 102 . The analog voice signal is converted into a digital signal by the A / D converter 102 and output to the voice coding device 103 .

[0028] The speech coding device 103 performs speech coding processing on the digital speech signal, and outputs the coded information to the modem unit 104 . The modem unit 104 digitally modulates the coded voice signal, and sends it to the wireless transmission unit 105 . The wireless transmission unit 105 applies predetermined wireless transmission processing to the modulated signal. This signal is transmitted via antenna 106 .

[0029] On the other hand...

Embodiment 2

[0054] Figure 9 It is a structural block diagram of the speech / noise signal adder in the speech decoding device according to Embodiment 2 of the present invention. The overall structure of the speech decoding device of embodiment 2 of the present invention and its working condition are identical with embodiment 1 except speech / noise signal adder, so omit its description, use Figure 9 Only the speech / noise signal adder is described.

[0055] exist Figure 9 Among them, the added noise characteristic controller 401 adaptively controls the characteristic of the noise added to the voiced interval according to the characteristic of the generated noise signal. The generated noise signal after the characteristic control is output to the adder 402, added to the decoded speech signal input to the adder 402, and output as a decoded output signal. In this case, the added noise characteristic controller 401 switches the added noise signal according to the voiced / non-voiced determinat...

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Abstract

Separation and DTX controller 301 receives the transmission data encoded and transmitted by the encoding end on the input signal as received data, and separates it into speech coded data or noise coded data required for speech decoding or noise generation, and a voiced / silent judgment flag. When the voiced / unvoiced determination flag indicates the voiced interval, the voice decoder 302 performs voice decoding based on the coded voice data, and outputs decoded voice. The noise signal generator 303 generates a noise signal based on the noise encoded data, and outputs the noise signal. The speech / noise signal adder 304 outputs the generated noise signal output by the noise signal generator 303 as a decoded signal in the silent interval, and outputs the decoded speech signal output by the speech decoder 302 and The generated noise signals output by the noise signal generator 303 are summed and output as a decoded signal.

Description

technical field [0001] The present invention relates to a low-bit-rate speech encoding device used in applications such as a mobile communication system for encoding and transmitting a speech signal, or a speech recording device. Background technique [0002] In the field of digital mobile communication and voice storage, a voice coding device that compresses voice information and encodes it at a low bit rate is used in order to effectively utilize radio waves and recording media. In particular, the speech signal is coded and transmitted mainly in the voiced interval of the speech signal, while in the unvoiced interval, a dedicated noise signal encoder for the unvoiced interval performs encoding and transmission at a bit rate lower than that of the voiced interval. Thus, the bit rate of transmission can be further reduced. [0003] As this prior art for encoding at a low bit rate, there is G.729 AnnexB (Appendix B) ("A silence compression scheme ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G10L25/93G10L19/012G10L19/04G10L19/12H03M7/30
CPCG10L19/012G10L19/18
Inventor吉田幸司
OwnerPANASONIC CORP