Coding device capable of detecting transient position of sound signal and its coding method

An encoding method and technology for sound signals, applied in the field of encoders, can solve problems such as uneconomical, high cost, and complex psychoacoustic models, and achieve low-cost and economical effects
CN1536559AInactive Publication Date: 2004-10-13MEDIATEK INC
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
MEDIATEK INC
Publication Date
2004-10-13
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a coder, containing multiphase filter group, transient detector and coding processing unit. It first codes sub-band, to produce many sub-band samples according to input signal, where each sub-band contains many frequency sub-bands. Then, it selects many sub-band samples as reference sampling data, and determines the block length of the visual window data according to the energy combination of the reference sampling data and the frequency sub-bands in the preset frequency range. Finally, according to the visual window data, transforms these frequency sub-sands by preset transformation algorithm to produce output signal.
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Description

technical field

[0001] The invention provides an encoder, especially an encoder capable of detecting the transient position of a sound signal. The encoder of the present invention can further determine the block length of the window data used in the frequency domain encoding. Background technique

[0002] At present, many encoders use special encoding algorithms based on the characteristics of the human auditory system, which can compress digital audio signal data to more than ten times, such as MP3, AAC, WWA, and Dolby Digital. These encoders use perceptual encoding, Frequency domain coding, window switching and dynamic bit allocation and other technologies are used to eliminate unnecessary content in the original sound signal data.

[0003] Perceptual coding is compression by eliminating sound signal data that is not perceived by the general human auditory system. Generally speaking, the sound frequency that humans can hear is about 20Hz to 20kHz, while the sound in othe...

Claims

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