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Method and device for synthesizing sub-band filter

An audio signal and filtering device technology, which is applied in the direction of pulse modulation TV signal transmission, instruments, voice analysis, etc., can solve the problems of multi-computing time, reducing the decoding efficiency and cost of MP3 audio frames, etc.

Inactive Publication Date: 2009-08-12
QUANTA COMPUTER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] like figure 2 As shown, because the frequency inversion process in the prior art includes multiple times of reading, storing and multiple judgment steps to the memory, the process of frequency inversion consumes a considerable amount of computing time, which reduces the efficiency of decoding MP3 audio frames

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  • Method and device for synthesizing sub-band filter
  • Method and device for synthesizing sub-band filter
  • Method and device for synthesizing sub-band filter

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Embodiment Construction

[0030] The main object of the present invention is to provide a method and apparatus for synthetic subband filtering in an audio signal decoder. According to the method and device of the present invention, the frequency inversion method in the prior art is combined into the sub-band synthesis filter method, thereby greatly increasing the speed of decoding MP3 audio frames.

[0031] see Figure 4 . Figure 4 It is a block diagram of a synthesized subband filtering device 40 according to a preferred embodiment of the present invention. The synthesized sub-band filtering device 40 is performed on M groups of signals, each of which includes N sub-band sampling signals S4A. For example, if the M groups of signals are sub-band sampling signals after IMDCT in the MPEG-1 Layer III standard, then M is equal to 18 and N is equal to 32.

[0032] The synthesized subband filtering device 40 includes a processor 41 . The processor 41 is used for processing the i-th group of signals in t...

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Abstract

The present invention provides a device and method for synthetic sub-band filtering in an audio signal decoder. The device according to the invention is performed for M sets of signals. Each group of signals contains N sub-band sampling signals respectively. The device includes a processor for processing the i-th group of signals among the M groups of signals, where i is an integer ranging from 0 to (M-1). The processor includes a discrete cosine transform module and a generating module. The discrete cosine transform module is used to convert N sub-band sampling signals in the i-th group of signals into N converted vectors. If i is an odd number, the conversion module multiplies the (2j-1)th sub-band sampling signal among the N sub-band sampling signals by negative one, where j is a range between 1 and (N / 2) integer. The generating module generates N pulse code modulation signals according to the N converted vectors.

Description

technical field [0001] The present invention relates to a method and device for synthetic subband filtering in an audio signal decoder. And especially, the synthesis sub-band filtering method and device according to the present invention are applied in audio signal decoders. Background technique [0002] The MPEG (Motion Pictures Experts Group) audio signal standard formulated by the International Standards Organization provides an algorithm for encoding / decoding audio signals, which can greatly reduce the bandwidth requirements for transmitting audio signals and provide low-distortion signal quality . The current MPEG audio signal standard includes three different processing methods: Layer I, Layer II, and Layer III. [0003] see figure 1 . figure 1 It shows the flowchart of decoding an audio frame in the MPEG-1 Layer III (MP3) standard. Step S11 is to unpack (unpack) the header of the audio frame, and decode side information in the audio frame. Step S12 is to decode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/52G10L19/00
Inventor 洪智玮张志舷蔡宪明
Owner QUANTA COMPUTER INC