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Howling suppression device, method thereof, and computer-readable recording medium

A technology for suppressing a device and a signal is applied in the field of suppressing howling that occurs when a conversation is easily performed by amplifying sound through a speaker, and can solve problems such as staggering, and achieve the effects of preventing delay and improving the effect of howling prevention.

Active Publication Date: 2022-06-03
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if the amplified voice is delayed and reproduced, it will sound different from the direct tone of the speaker's voice.

Method used

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  • Howling suppression device, method thereof, and computer-readable recording medium
  • Howling suppression device, method thereof, and computer-readable recording medium
  • Howling suppression device, method thereof, and computer-readable recording medium

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0032]

[0033] The signal analysis numerical values ​​of the two howling systems are cooperated, and the information of the component that may become the howling frequency can be obtained more accurately. Thereby, the divergence of howling caused by the detection delay is prevented.

no. 1 approach ＞

[0035] The howling suppression system includes two howling suppression devices 100-i. where i=1,2. image 3 An example of the arrangement of two howling suppression apparatuses 100-i is shown.

[0036] Figure 4 A functional block diagram showing the howling suppression device according to the first embodiment, Figure 5 Indicates its processing flow.

[0037] The howling suppression device 100 - i includes a frequency converting unit 110 , a smoothing processing unit 120 , a delaying unit 121 , an integrating processing unit 130 , a howling suppression processing unit 140 , and an inverse frequency converting unit 150 .

[0038] The howling suppression processing unit 140 includes a power determination unit 141, a time constant determination unit 142, a delay unit 143, a gain calculation unit 144, and a gain superimposition unit 145. Image 6 A functional block diagram showing the howling suppression processing unit 140, Figure 7 Indicates its processing flow.

[0039]...

Deformed example 1

[0099] In this embodiment, the first gain G p1 , the second gain G s1 They are set to fixed values, but they can also be linked to the input audio signal. For example, make settings so that

[0100] G p1 =α×Thr2 / - X(k,n).

[0101] α is a real number greater than 0 and less than 1, in X i (k,n)= - When X(k,n) and α=1, G p1 become the X i (k,n) Suppression gain down to Thr2. When α is smaller than 1, the suppression amount is set so as to be further smaller than Thr2. For example, Thr2 is set to a value at which a louder sound is regarded as howling, or a smaller value. In addition, Thr2 may be set to a value equal to or less than Thr1 used in the power determination unit 141 .

[0102] About the second gain G s1 It can also be set so that

[0103] G S1 =α 2 ×Thr3 / - X(k,n).

[0104] alpha 2 is a real number of 0 or more and 1 or less. Thr3 is set based on the same considerations as Thr2.

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Abstract

The howling suppression device includes: an integration processing unit, setting L as any integer greater than 2, setting i=1, 2,..., L, from the L values ​​corresponding to the n-th frame of the L i-th signal Finding the maximum value, wherein the L i-th signals are signals in the frequency domain obtained from sound signals picked up by a plurality of microphones; One performs howling suppression processing.

Description

technical field [0001] The present invention relates to a technique for suppressing howling that occurs when a sound is amplified by a speaker to facilitate conversation. Background technique [0002] In a wide space, it is difficult for people's conversational voices to reach each other, making it difficult to conduct conversations. In such cases, loudspeaker devices are often used. For purposes such as multi-person conferences, such as figure 1 As shown, the following processing is also performed: the voice of a speaker located far from the listener in the same space is picked up by the microphone speaker 1 arranged near the speaker, reproduced by the microphone speaker 2 arranged near the listener, and Amplify. There are two sets of microphones and speakers (for example, microphones and speakers in which the microphones and speakers are assembled in one housing), and the sound picked up by the microphones close to the speaker among the two sets of microphones is picked...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/02G10L21/034H03G3/32
CPCH04M9/082H04R3/02H03G3/32G10L21/034H04R1/406H04R3/005H03G2201/103
Inventor 齐藤翔一郎小林和则中川朗原田登
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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