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Equalizer design method and equalizer

A design method and equalizer technology, applied in the field of signal processing, can solve problems such as deterioration of subjective sound quality/objective test, output signal overflow/clipping, excessive attenuation, etc., to improve subjective sound quality and objective test effect, avoid overflow/clipping wave effect

Active Publication Date: 2014-06-04
MORNINGCORE HLDG CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0022] The object of the present invention is to provide a kind of equalizer design method and equalizer, utilize the partial characteristic of speech signal, to solve the problem that equalizer in the prior art easily causes output signal overflow / clipping, deteriorates subjective sound quality / objective test problem, also Avoid the excessive attenuation problem of traditional methods

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  • Equalizer design method and equalizer

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Embodiment Construction

[0070] The equalizer design method and the equalizer proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0071] Please refer to Figure 4 , which is a schematic flowchart of an equalizer design method according to an embodiment of the present invention. Such as Figure 4 As shown, the equalizer design method includes:

[0072] Step S40: Obtain the expected frequency response;

[0073] Step S41: Obtain filter coefficients according to the expected frequency response;

[0074] Step S42: Acquiring normalized filter coefficients according to the filter coeffi...

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Abstract

The invention provides an equalizer design method and an equalizer. The equalizer design method comprises the following steps an excepted frequency response is acquired; filter coefficients are acquired according to the excepted frequency response; normalized filter coefficients are acquired according to the filter coefficients; and the compression process is performed on the normalized filter coefficients. By performing the compression process on the normalized filter coefficients, the equalizer output signal overflow / clipping problem can be avoided so as to improve the subjective sound quality and the objective test effects.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an equalizer design method and an equalizer. Background technique [0002] The equalizer is an essential module in the voice link, which is used to compensate the frequency response of the terminal itself to pass the 3GPP specification or meet the requirements of the network (operator). In addition, the equalizer adjusts the timbre to enhance the clarity and intelligibility of the speech signal. In order to minimize the nonlinear distortion of speech signals, equalizers generally need to have linear phase characteristics (i.e. minimum distortion), stability (i.e. limited input and limited output) and wide adaptability (i.e. low-pass, high-pass, band-pass, band-pass Resistance, etc.), therefore, the equalizer in the voice link usually uses a Type I FIR filter (in this application, the equalizer and the filter are equivalent). [0003] Please refer to figure 1 , which ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 谢单辉王彦许云峰
Owner MORNINGCORE HLDG CO LTD