Methods and apparatus for coding and decoding highband part of voice signal

A voice signal, high-frequency band technology, applied in the field of signal processing, can solve the problem that the rough spectral envelope or formant structure of the voice signal cannot be accurately predicted.

Active Publication Date: 2008-05-21
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

While this approach can be implemented without increasing bandwidth and without transcoding, it is often not possible to accurately predict the coarse spectral envelope or formant of the high-band portion of the speech signal from the spectral envelope of the narrow-band portion structure

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  • Methods and apparatus for coding and decoding highband part of voice signal
  • Methods and apparatus for coding and decoding highband part of voice signal
  • Methods and apparatus for coding and decoding highband part of voice signal

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Embodiment Construction

[0059] Embodiments described herein include systems, methods, and apparatus that can be configured to provide extensions to narrowband speech coders to support transmission and / or storage of wideband speech signals with only about an 800-1000 bps (bits per second) increase in bandwidth. Potential advantages of such implementations include embedded coding to support compatibility with narrowband systems, relatively easy allocation and reallocation of bits between narrowband and highband coded channels, avoiding computationally expensive wideband synthesis operation, and to maintain a low sample rate for signals to be processed by computationally intensive waveform encoding routines.

[0060] Unless specifically limited by context, the term "calculate" is used herein to mean any of its ordinary meanings, such as calculating, generating, and selecting from a list of values. When the term "comprising" is used in the description and claims, it does not exclude other elements or ope...

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Abstract

A wideband speech encoder according to one embodiment includes a lowband encoder and a highband encoder. The lowband encoder is configured to encode a lowband portion of a wideband speech signal as a set of filter parameters and an encoded excitation signal. The highband encoder is configured to calculate values for coding parameters that specify a spectral envelope and a temporal envelope of a highband portion of the wideband speech signal. The temporal envelope is based on a highband excitation signal that is derived from the encoded excitation signal. In one such example, the temporal envelope is based on a difference in levels between the highband portion and a synthesized highband signal, wherein the synthesized highband signal is generated according to the highband excitation signal and a set of highband filter parameters.

Description

[0001] This application claims priority based on US Provisional Patent Application No. 60 / 667,901, filed April 1, 2005, entitled "CODING THE HIGH-FREQUENCYBAND OF WIDEBAND SPEECH." This application also claims priority to US Provisional Patent Application No. 60 / 673,965, filed April 22, 2005, entitled "PARAMETER CODING IN AHIGH-BAND SPEECH CODER." technical field [0002] The present invention relates to signal processing. Background technique [0003] The bandwidth of voice communications over the Public Switched Telephone Network (PSTN) has traditionally been limited to the frequency range of 300-3400 kHz. Newer networks for voice communications such as cellular telephony and Voice over IP (VoIP) may not have the same bandwidth constraints and may need to transmit and receive voice communications over such networks involving wideband frequency ranges . For example, it may be desirable to support audio frequency ranges extending down to 50Hz and / or all the way to 7 or 8kH...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/04G10L19/14
Inventor 科恩·贝尔纳德·福斯阿南塔帕德马纳卜汉·A·坎达达伊
Owner QUALCOMM INC
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