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Decoding method and decoding device

A decoding method and current frame technology, applied in the field of encoding and decoding, can solve the problems of reconstructed signal noise, discontinuous transition of frame loss, discontinuous spectrum, etc.

Active Publication Date: 2015-01-21
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] Since the subframe gain used in frame loss processing is a set fixed value, spectrum discontinuity may occur, making the transition before and after frame loss discontinuous, causing noise in the reconstructed signal, and reducing the voice quality

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  • Decoding method and decoding device
  • Decoding method and decoding device

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Embodiment Construction

[0104] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0105] During speech signal processing, in order to reduce the computational complexity and processing delay of the codec when performing speech signal processing, the speech signal is generally processed in frames, that is, the speech signal is divided into multiple frames. In addition, when speech occurs, the vibration of the glottis has a certain frequency (corresponding to the pitch period). When the pitch period is small, if the frame length is too...

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Abstract

A decoding method and a decoding device. The decoding method comprises: in the case where a current frame is determined as a lost frame, synthetizing a high-frequency band signal according to a decoding result of a previous frame (110); according to a subframe gain of subframes of at least one frame before the current frame and a gain gradient between subframes of the above-mentioned at least one frame, determining the subframe gain of a plurality of subframes of the current frame (120); determining a global gain of the current frame (130); and according to the global gain and the subframe gain of the plurality of subframes, adjusting the synthetized high-frequency band signal to obtain a high-frequency band signal of the current frame (140). Since the subframe gain of the current frame is obtained according to the subframe gain gradient of the subframe before the current frame, the transition before and after losing the frame has a better continuity, thereby reducing the reconstruction signal noise, and improving the voice quality.

Description

technical field [0001] The present invention relates to the field of encoding and decoding, in particular to a decoding method and a decoding device. Background technique [0002] With the continuous advancement of technology, users have higher and higher requirements for voice quality, among which increasing voice bandwidth is the main method to improve voice quality. Generally, a frequency band extension technology is used to increase the bandwidth, and the frequency band extension technology is divided into a time domain frequency band extension technology and a frequency domain frequency band extension technology. [0003] In time-domain frequency band extension technology, packet loss rate is a key factor affecting signal quality. In case of packet loss, it is necessary to recover the lost frame as correctly as possible. The decoding end judges whether frame loss occurs by analyzing the code stream information. If frame loss does not occur, normal decoding processing ...

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Application Information

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IPC IPC(8): G10L19/005
CPCG10L19/005G10L19/0208G10L21/0388G10L19/00G10L21/0232
Inventor 王宾苗磊刘泽新
Owner HUAWEI TECH CO LTD
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