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Howling detection and suppression method and device thereof

A detection method and peak technology, applied in the field of howling detection and suppression, can solve problems such as not good results, high difficulty, and difficulty in ensuring the linearity of echo signals, so as to achieve less damage to speech quality, improve robustness, and reduce errors. the effect of judgment

Active Publication Date: 2019-02-15
LEADCORE TECH
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Problems solved by technology

The echo signal has a strong correlation with the near-end signal, and the linearity of the echo signal is difficult to guarantee
Therefore, the method of using adaptive feedback is relatively difficult, and the effect is not necessarily good.

Method used

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  • Howling detection and suppression method and device thereof
  • Howling detection and suppression method and device thereof
  • Howling detection and suppression method and device thereof

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Embodiment Construction

[0038] Embodiments of the present invention propose howling detection and suppression methods. This howling detection method can improve the robustness of howling detection and reduce misjudgment. This howling suppression method can correspondingly suppress according to the detected accurate howling point, so that the howling point is suppressed cleanly, and the voice quality is also slightly damaged.

[0039] Figure 4 A flow chart of a method for detecting howling according to an embodiment of the present invention is shown. refer to Figure 4 As shown, the method of the present embodiment includes the following steps:

[0040] In step 301, the input speech signal frame is transformed from the time domain to the frequency domain, ie frequency conversion.

[0041] The function of time-frequency transformation is to transform the time-domain signal into the frequency domain, and detect the howling point in the frequency domain. In each embodiment of the present invention,...

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Abstract

The invention relates to a howling detection method which comprises the following steps: an input voice signal frame is converted from a time domain to a frequency domain, and a plurality of peak value frequency points that are maximum in energy in the voice signal frame are chosen; according to probability of occurrence of each peak value frequency point in a preset time period and a peak to average value ratio of each peak value frequency point, whether each peak value frequency point is a suspected howling point is determined; continuous occurrence frequency of each peak value frequency point being determined as the suspected howling point is subjected to confidence counting operation; whether the suspected howling point is a real howling point is determined according to a result of comparison between a confidence count and a confidence count threshold.

Description

technical field [0001] The invention relates to sound signal processing, in particular to howling detection and suppression methods. Background technique [0002] Howling, also known as self-excitation or acoustic feedback. When a microphone is used for live sound reinforcement, the problem of microphone howling is prone to occur. This is when the sound signal is sent out from the speaker and then input to the sound reinforcement system from the microphone and then amplified again to form signal superposition and positive feedback, so that the signal is continuously amplified and howling occurs. [0003] figure 1 Shows the block diagram of the howling system, where X(z) is the input signal, Y(z) is the output signal, G(z) is the forward system, and F(z) is the feedback system. [0004] The closed-loop system transfer function of this system is: [0005] [0006] According to the Nyquist stability criterion, if there exists ω=2π(f / f s ), so that the magnitude and phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/02
Inventor 张金亮王彦
Owner LEADCORE TECH
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