FIELD: information technology.
SUBSTANCE: method for decoding an audio signal involves obtaining lower-band signal components of an audio signal in a received code stream when the audio signal switches from a first bandwidth to a second bandwidth which is narrower than the first bandwidth; extending the lower-band signal components to obtain higher-band information; performing a time-varying fadeout process on the higher-band information obtained via extension obtain a processed higher-band signal component; and synthesising the processed higher-band signal component and the obtained lower-band signal component. The time-varying fadeout process involves performing a frequency-domain higher-band parameter time-varying weighting method for higher-band information obtained via extension, so as to obtain a time-varying fadeout spectral envelope and obtain a higher-band signal component through decoding.
EFFECT: high quality of decoded speech signal when switching bandwidth.
11cl, 13 dwg, 2 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD AND APPARATUS FOR ENCODING AND DECODING | 2009 |
|
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| METHOD AND APPARATUS FOR GENERATING NOISES | 2009 |
|
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| AUDIO PROCESSING SYSTEM | 2014 |
|
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| AUDIO BANDWIDTH EXTENSION BY INSERTION OF TEMPORAL PRE-SHAPED NOISE IN FREQUENCY DOMAIN | 2014 |
|
RU2666468C2 |
| AUDIO CODER FOR CODING MULTI-CHANNEL SIGNAL AND AUDIO CODER FOR DECODING CODED AUDIO SIGNAL | 2016 |
|
RU2679571C1 |
| METHOD AND MEANS FOR ENCODING BACKGROUND NOISE INFORMATION | 2009 |
|
RU2461080C2 |
| AUDIO CODER FOR CODING MULTI-CHANNEL SIGNAL AND AUDIO CODER FOR DECODING CODED AUDIO SIGNAL | 2016 |
|
RU2680195C1 |
| AUDIO ENCODER AND AUDIO DECODER FOR ENCODING AND DECODING AUDIO SIGNAL READINGS | 2009 |
|
RU2515704C2 |
| ADAPTIVE BAND EXTENSION AND DEVICE THEREFOR | 2014 |
|
RU2641224C2 |
| AUDIO SIGNAL CODING AND DECODING DEVICE USING FREQUENCY-DOMAIN PROCESSOR, TIME-DOMAIN PROCESSOR AND CROSS-PROCESSOR FOR CONTINUOUS INITIALIZATION | 2015 |
|
RU2668397C2 |
