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

Inactive Publication Date: 2004-10-13
MEDIATEK INC
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Problems solved by technology

It is known that MPEG sound signal coding uses psychoacoustic model 16 to detect the transient position of the sound signal, although it is very accurate, but because the psychoacoustic model 16 is quite complicated, the required cost is also high. It is quite uneconomical to use a high-cost psychoacoustic model16 for the transient position of

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

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Embodiment Construction

[0017] Please refer to figure 2 , figure 2 is a schematic diagram of an encoder 30 according to an embodiment of the present invention. The encoder 30 is used to encode the pulse code modulated input signal 10 into an output signal 22 of a bit stream. The encoder 20 includes a polyphase filter bank 12 , a transient detector 32 and an encoding processing unit 34 . The polyphase filter bank 12 generates a plurality of subband samples according to the input signal 10 , and different subband samples correspond to waveforms of the input signal 10 at different periods, and each subband sample includes multiple frequency subbands. The encoding processing unit 34 may perform Modified Discrete Cosine Transformation on the multiple frequency subbands. The transient detector 32 is connected between the polyphase filter bank 12 and the encoding processing unit 34, and can determine the block length of the window data used by the encoding processing unit 34 to perform Modified Discret...

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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.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/16
Inventor 徐建华
Owner MEDIATEK INC
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