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Quantitative noise leakage control method and apparatus

A technology of a control unit and an encoding device, applied in the field of communication, can solve the problems of time-domain leakage of quantization noise, occupying a lot of system resources, and high computational complexity, achieving the effects of low complexity, improving encoding efficiency, and saving system resources

Inactive Publication Date: 2009-07-22
HUAWEI TECH CO LTD
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Problems solved by technology

[0012] To sum up, the prior art methods to solve the quantization noise leakage problem caused by pre-echo in the time domain have the following problems: high computational complexity, large time delay, low coding efficiency, occupying more system resources, and low accuracy rate. inferior

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  • Quantitative noise leakage control method and apparatus
  • Quantitative noise leakage control method and apparatus
  • Quantitative noise leakage control method and apparatus

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Embodiment Construction

[0039] 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 only some of the embodiments of the present invention, 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 making creative efforts belong to the protection scope of the present invention.

[0040] In the embodiment of the present invention, the current frame signal is detected at the encoding end, and different encoding processes are performed on the detected transient signals and non-transient signals, and the transient signals are normalized by using the time domain envelope, and then the The transformation coding based on the perceptual coding principle, for the non-transient signal, the transformation coding based on the perceptu...

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Abstract

The invention relates to a device for controlling quantizing noise leakage in the technical field of communications, comprising a transient signal detecting unit and an alternative control unit, wherein, the transient signal detecting unit is used for dividing a currently input frame signal into a plurality of subframes, calculating a maximum amplitude value of each subframe and adopting the ratio of the maximum amplitude value of each subframe and the sum of the maximum amplitude values of adjacent subframes of the individual subframe as a transient detection function; the ratio is judged, if the ratio is more than a certain threshold value, then the transient signal is detected, if not, the transient signal is not detected and a transient signal detection result is transmitted; the alternative control unit is used for receiving the transient signal detection result and choosing different branch routes for encoding processing regarding different signals. The invention also provides a method for controlling quantizing noise leakage and solves the problems in the existing proposal for controlling quantizing noise leakage that the computational complexity is high, the time delay is long, the encoding efficiency is low and the occupied resources are more.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a quantization noise leakage control method and device. Background technique [0002] In audio and wideband and ultra-wideband speech coding and decoding, transform domain coding based on MDCT (Modified DiscreteCosine Transform, Modified Discrete Cosine Transform) has good energy compression and frequency resolution performance, so it has been widely used. Its core idea is to transform a signal of a certain length into the transform domain through a certain transformation, and then quantize and encode the coefficients in the transform domain according to a specific quantization strategy. Since there is a masking effect in human hearing, this feature can be used when considering the quantization strategy. When the signal energy is large, a large quantization error is allowed. [0003] For audio or speech signals, there are often such scenarios: the signal suddenly ...

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Application Information

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IPC IPC(8): G10L19/02G06F17/14G10L19/025G10L19/24
CPCG10L19/025G10L19/24
Inventor 张德明张琦
Owner HUAWEI TECH CO LTD
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