Method and device for generating quantification control parameter and audio coding device

A technology of quantization control and audio coding, applied in the field of audio coding and decoding, which can solve the problems of large calculation amount of psychoacoustic model and increase the workload of audio encoder, and achieve the effect of reducing calculation amount and complexity and reducing workload.

Active Publication Date: 2010-02-10
HUAWEI DEVICE CO LTD
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Problems solved by technology

[0004] It can be seen from the above that in the existing audio encoder, the psychoacoustic model needs to calculate the noise masking and tone masking characteristics to generate the quantization control parameters for controlling the quantization step size, which will lead to a large amount of calculation for the psychoacoustic model. Increases the workload of the audio encoder

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  • Method and device for generating quantification control parameter and audio coding device
  • Method and device for generating quantification control parameter and audio coding device
  • Method and device for generating quantification control parameter and audio coding device

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Embodiment 1

[0042] Embodiment 1 of the present invention provides a method for generating quantization control parameters in the audio coding process, such as figure 2 Shown is a schematic flow chart of the method provided in this embodiment 1, the method comprising:

[0043] Step 200: Receive a frequency domain signal.

[0044] Step 201: Obtain the energy of the frequency domain signal according to the frequency domain signal.

[0045] In a specific implementation process, the energy of the frequency domain signal may be calculated according to the amplitude value of the frequency domain signal. For example, the energy of the frequency domain signal can be obtained by calculating the square of the amplitude value of the frequency domain signal. Certainly, the embodiment of the present invention includes but is not limited to adopting the above method to obtain the energy of the frequency domain signal.

[0046] Step 202: Obtain a total masking value of at least one frequency point ac...

Embodiment 2

[0052] Embodiment 2 of the present invention provides another method for generating quantization control parameters in the audio coding process, such as image 3 As shown, the method includes:

[0053] Step 300, receiving a frequency domain signal;

[0054] Step 301. Determine an area according to the frequency domain signal;

[0055] In a specific implementation process, the area determined here may be any area in the frequency domain signal, and may also be one or more areas.

[0056] Step 302, obtaining the energy of the frequency domain signal in the area;

[0057] In a specific implementation process, the energy of the frequency domain signal in the area may be calculated according to the amplitude value of the frequency domain signal in the area. For example, the energy of the frequency domain signal in the area may be obtained by calculating the square of the amplitude value of the frequency domain signal in the area. Certainly, the embodiment of the present invention...

Embodiment 3

[0064] Embodiment 3 of the present invention provides another method for generating quantization control parameters in the audio coding process, such as Figure 4 As shown, the method includes:

[0065] Step 400, receiving a frequency domain signal;

[0066] Step 401, dividing the frequency spectrum of the frequency domain signal into N partitions, where N is a natural number;

[0067] In the specific implementation process, if the masking value of each frequency point in the frequency domain signal is calculated one by one, the amount of calculation will be large; therefore, the entire frequency domain signal can be divided into several small partitions, as described in Embodiment 3 N partitions; then only calculate the masking value of the center frequency point of each partition, and the masking value of other frequency points in the partition can be replaced by the masking value of the center frequency point of the partition, which can further reduce the calculation of th...

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Abstract

The embodiment of the invention provides a method and a device for generating quantification control parameter and an audio coding device. The method concretely comprises: firstly, calculating the energy of a frequency domain signal; according to the energy of the frequency domain signal, calculating the total masking value of at least one frequency point of the frequency domain signal; then, according to the obtained total masking value of the frequency, obtaining a quantification control parameter used for controlling quantization steps. Thus, the invention only needs to calculate the masking effect of one frequency point instead of calculating frequency domain signal noise and pitch masking characteristics, so that the invention reduces the calculated amount and the complexity of a psychoacoustic model under the condition of ensuring tone quality and lowers the working burden of the audio coding device.

Description

technical field [0001] The present invention relates to the field of audio coding and decoding, in particular to a method, device and audio coding equipment for generating quantization control parameters in the audio coding process. Background technique [0002] At present, the structure of a common audio encoder includes modules such as time-frequency transformation, psychoacoustic model, and quantization coding, such as figure 1 Shown is a schematic structural diagram of an audio encoder in the prior art, in figure 1 Middle: The audio time-domain signal is converted into a frequency-domain signal after being processed by the time-frequency transformation module; the psychoacoustic model uses the auditory masking effect of the human ear to process the time-domain signal and frequency-domain signal to generate The quantization control parameter; the quantization coding module then performs quantization and entropy coding processing on the frequency domain signal based on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/002G10L19/032
Inventor 詹五洲
Owner HUAWEI DEVICE CO LTD
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