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Method and device for detecting harmonic signal

A technology of harmonic signal and detection method, applied in the field of signal processing, can solve the problems of inaccurate cross-correlation coefficient, signal misjudgment, affecting the calculation of cross-correlation coefficient, etc., and achieve the effect of reducing the amount of calculation and making accurate judgments.

Inactive Publication Date: 2010-10-13
HUAWEI TECH CO LTD
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Problems solved by technology

[0009] However, in the above-mentioned prior art, the MDCT coefficients contain amplitude and phase information, and the phase information will affect the calculation of the cross-correlation coefficient, so that the final cross-correlation coefficient is not accurate enough, and it is easy to cause the signal to be misjudged

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  • Method and device for detecting harmonic signal

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Embodiment Construction

[0027] Embodiments of the present invention provide a harmonic signal detection method and device for improving the accuracy of harmonic signal detection.

[0028] see figure 1 , an embodiment of the harmonic signal detection method in the embodiment of the present invention includes:

[0029] 101. Obtain a frequency domain signal in the current signal frame;

[0030] In this embodiment, the signal frame currently being detected is taken as the current signal frame for illustration. It can be understood that in practical applications, the signal frame that needs to be detected by the harmonic signal can also be used as the current signal frame. There is no limit.

[0031] 102. Search the frequency domain signal to obtain first peak information;

[0032] In this embodiment, after the frequency domain signal is obtained from the current signal frame, the frequency domain signal can be searched to obtain the first peak information, specifically, the frequency domain signal can...

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Abstract

The embodiment of the invention discloses a method and a device for detecting a harmonic signal, which are used for accurately detecting the harmonic signal. The method comprises the following steps of: acquiring a frequency domain signal in a current signal frame; searching for the frequency domain signal to acquire first peak information; matching the first peak information and second peak information to acquire a matched numerical value, wherein the second peak information is the peak information of the frequency domain signal in the signal frame acquired before the current signal frame; and judging whether the matched numerical value exceeds a preset matched threshold, and determining the current signal frame is a harmonic signal frame if does. The embodiment of the invention also provides the device for detecting the harmonic signal. The method and the device can accurately detect the harmonic signal.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a harmonic signal detection method and device. Background technique [0002] In parametric audio coding technology, the audio signal is usually firstly detected for its characteristics, and then different parameter extraction techniques are used for different characteristics. The extracted parameters will be encoded and passed to the decoder, and the decoder restores the parameters according to the received parameters. audio signal. The most commonly used signal characteristics are harmonic (harmonic) and non-harmonic. [0003] The essence of an audio signal is a sound wave, which is generated by the vibration of an object. Among them, the minimum frequency of the vibration of an object is called the "fundamental frequency" (fundamental frequency), and the waves generated by the vibration of each multiple frequency of the fundamental frequency are called "Harmonic". In an audi...

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Application Information

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IPC IPC(8): G01R23/16
Inventor 刘长娥张德明
Owner HUAWEI TECH CO LTD
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