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Method, system and device for frequency band expansion

A technology of frequency band extension and decoding method, which is applied in the field of signal bearing, can solve the problem of consuming too many bit resources, and achieve the effect of less bit resource consumption and good auditory effect

Active Publication Date: 2010-01-06
靖江市华信科技创业园有限公司
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Problems solved by technology

[0005] Embodiments of the present invention provide a method, system, and device for frequency band expansion, which solve the problem of consuming too many bit resources in the prior art

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  • Method, system and device for frequency band expansion
  • Method, system and device for frequency band expansion

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Embodiment Construction

[0030] see figure 1 It is a signaling flowchart of the first embodiment of a decoding method of the present invention.

[0031] The embodiment of the present invention is used in an ultra-wideband codec. The input signal of the encoder is 32kHz sampling rate, and the processing frame length is 20ms. After the input signal is divided into frequency bands and down-sampled, there are 320 sampling points corresponding to the signal in the 0-8kHz frequency band, and 320 sampling points corresponding to the signal in the 8-16kHz frequency band. The signals in the 0-8kHz frequency band are processed by the core coder, which can be a G.729.1 codec or other broadband signal codecs.

[0032] For the time-domain signals {y_hi(0), y_hi(1), ..., y_hi(319)} in the 8-16kHz frequency band, a set of MDCT coefficients are obtained after MDCT transformation, that is, the corresponding frequency domain signal { y_swb(0), y_swb(1), ..., y_swb(319)}, since the ultra-wideband part only processes s...

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Abstract

The invention discloses a frequency expansion method. The embodiment of the invention also provides corresponding system and device. Tone characteristic parameter and original high band signal are obtained; an excitation spectrum is generated according to the tone characteristic parameter; and a reconstructed high band signal is generated according to the excitation information and the contour information in the original high band signal. The technical scheme of the invention includes that key characteristic parameter of the original high band signal which is extracted at a coding terminal and a decoding terminal are adopted for reconstruction on a high band signal according to the tone characteristic parameter; the reconstructed high band signal is not only similar to the original high band signal in contour but also well matched in detail, and better hearing effect can be achieved by less bit resource consumption.

Description

technical field [0001] The present invention relates to the technical field of signal bearing, in particular to a method, system and equipment for frequency band expansion. Background technique [0002] In the existing bearer technology, when the broadband and ultra-wideband resources are limited, usually only the spectrum envelope, time-domain envelope, and part of the spectral coefficients of the broadband and ultra-wideband part can be encoded, and then these parameters are passed at the decoding end. The method extends the frequency band and reconstructs the signals of broadband and ultra-wideband. [0003] The existing frequency band extension method is mainly represented by AMRWB+ (Adaptive multi-rate wide bandplus adaptive multi-rate wideband coding +), which uses a narrowband excitation signal and a highband synthesis filter to generate a highband signal to realize frequencyband expansion. . [0004] During the research and practice of the prior art, the inventors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/08G10L19/14G10L21/02G10L21/038
CPCG10L21/038
Inventor 张德明张立斌张琦
Owner 靖江市华信科技创业园有限公司
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