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Subband analysis and composition filtering method

A sub-sample technology, applied in the field of sub-band analysis/synthesis filtering, can solve problems such as discontinuous arrangement order, waste of data reading time, and consumption of buffer storage space, so as to save storage space and save data reading time Effect

Inactive Publication Date: 2005-06-01
MEDIATEK INC
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Problems solved by technology

[0006] From the above, it can be seen that the known subband analysis / synthesis filtering technique consumes a lot of buffer storage space due to the need to perform many addition operations and multiplication operations
In addition, because the order of the operands in the related operation process of the known technology is not continuous in the corresponding vector or matrix, it is not suitable for the aforementioned pipelined single instruction multiple data operation.
And when the vectors or matrices corresponding to these operands are stored in a storage device, a lot of data reading time will be wasted
Known technology needs to be improved

Method used

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  • Subband analysis and composition filtering method

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Embodiment Construction

[0019] The present invention provides a subband analysis / synthesis filtering (Subband Analysis / Synthesis Filtering) method. Below at first introduce the sub-band analysis filtering method of the present invention (as figure 1 Encoding flow shown). Next introduce the sub-band synthesis filter method of the present invention (as figure 2 The decoding process shown).

[0020] Please refer to figure 1 , figure 1 It is a schematic flowchart of encoding an audio signal by the audio processing method of the present invention. The invention provides an audio processing method for encoding an audio signal. The order of these steps does not limit the scope of the invention and the method is illustrated below.

[0021] Step 110: Sampling audio signals in 2P time domain intervals to generate 2P*M audio samples (Audio Sample) X[n];

[0022] Step 120: Perform windowing operation (WindowingOperation) on the 2P*M sound samples X[n] to generate 2P*M windowed (Windowed) sound samples co...

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Abstract

The present invention provides one kind of audio coding / decoding method for coding one audio signal and decoding several subband samples to generate one digital audio signal. During coding, P window sound samples in 2P time domain intervals are used in generating the 0-th sum, 2P window sound samples in 2P time domain intervals are used in generating one of the 1st sum to the (M-1)-th sum, and M subband samples are calculated based on the M sums. During decoding, corresponding to the variation of the first index, M subband samples are read out of several subband samples and one digital audio signal is generated by means of one inverse modified discrete cosine conversion and one comprehensive operation.

Description

technical field [0001] The present invention relates to an audio encoding / decoding method, in particular to a subband analysis / synthesis filtering (Subband Analysis / Synthesis Filtering) method. technical background [0002] With the improvement of the calculation speed of electronic circuits, calculations (such as video / audio processing) that consume a large amount of system resources have become one of the development priorities of electronic devices. General video / audio processing specifications usually include several encoding types to meet the encoding requirements of various data. Taking the MPEG (Moving Picture Coding Experts Group) specification as an example, the audio coding / decoding is defined as a subband analysis / synthesis filtering (Subband Analysis / Synthesis Filtering). For relevant information, please refer to ISO 11172-3, US Patents USP5,214,678, USP5,508,949, USP5,809,474, USP6,094,637, and IEEE Signal Processing Letter Vol.1 No. "Fast subband filtering in ...

Claims

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Application Information

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IPC IPC(8): G10L19/02G10L19/26H03M7/30
Inventor 林宗瑶徐建华
Owner MEDIATEK INC
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