Howling suppression method and device, loudspeaker and sound amplifying system

A technology of suppressing device and controller, applied in the field of audio and sound reinforcement systems, howling suppression methods, and devices, can solve the problems of harsh whistling, changing frequency response, sound distortion, etc., to achieve the effect of avoiding whistling

Active Publication Date: 2019-04-16
KTMICRO ELECTRONICS
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sound is amplified step by step in the continuous feedback, resulting in a piercing howling sound, which seriously affects the user's listening experience
At present, for howling suppression methods in sound reinforcement systems such as frequency shifting and phase shifting, in the process of sound processing, by changing the frequency or phase of the sound in real t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Howling suppression method and device, loudspeaker and sound amplifying system
  • Howling suppression method and device, loudspeaker and sound amplifying system
  • Howling suppression method and device, loudspeaker and sound amplifying system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0031] This embodiment provides a howling suppression method, which can effectively suppress the generation of howling in the public address system, see figure 2 , the method includes:

[0032] Step 101: Receive a first signal, where the first signal is a sound signal collected by a microphone within a first time period.

[0033]Any time period on the time axis executed by this method is used as the first time period. In the first time period, when the user speaks or sings, the sound signal will be transmitted from the microphone in real time, and at the same time, the signal played by the speaker will pass through the space. After propagation and reflection, it will also be collected by the microphone. At this time, the signal contained in the first signal is the user's real-time speaking (singing) voice and the voice signal fed back through space.

[0034] Step 102: Obtain the frequency spectrum of the first signal, determine a first hearing threshold curve according to th...

no. 2 example

[0050] This embodiment provides a howling suppression device, refer to Figure 4 , comprising a signal amplifier 201, a controller 202, an adder 203 and a power amplifier 204, the controller 202 is connected to the signal amplifier 201 for adjusting the gain of the signal amplifier 201, the output of the controller 202 and the output of the signal amplifier 201 are connected to The input end of the adder 203 is connected, and the output end of the adder 203 is connected to the input end of the power amplifier 204 . The controller may be a digital signal processing (Digital Signal Processing, DSP) chip, which is used in the howling suppression device to execute the method in the first embodiment.

[0051] During the time period t1-t2, the sound signal S2 collected by the microphone is transmitted to the howling suppression device, amplified by the signal amplifier, and then output to the adder. At the same time, the controller updates the hearing threshold curve by analyzing th...

no. 3 example

[0057]This embodiment provides an audio system, including the howling suppression device provided in the second embodiment and the loudspeaker, the loudspeaker is connected to the output end of the power amplifier in the howling suppression device, the input terminal of the controller in the howling suppression device and the signal The input end of the amplifier is used to receive the sound signal collected by the microphone.

[0058] The way in which the sound signal collected by the microphone is transmitted to the sound can include wireless and wired methods. For example, the sound in this embodiment can be a Bluetooth sound, and the data transmission of the sound signal can be carried out with the microphone through Bluetooth, or can be connected through WiFi or other local area networks. The input mode is connected to the microphone. When the microphone collects the sound signal, it is transmitted to the howling suppression device in the audio system. After the howling su...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a howling suppression method and device, a loudspeaker and a sound amplifying system. The method comprises the following steps: receiving a first signal, wherein the first signal is a sound signal acquired by a microphone within a first time period; acquiring the frequency spectrum of the first signal, determining a first hearing threshold curve according to the frequency spectrum of the first signal, and generating a first reference signal according to the first signal and the first hearing threshold curve, wherein the first reference signal and the first signal are played by the speaker together; receiving a second signal, wherein the second signal is a sound signal acquired by the microphone within a second time period after the first time period; and calculatinga correlation value of the second signal and the first reference signal, and determining whether to decrease a gain for the sound signals acquired by the microphone according to the correlation value.The sound intensity represented by the amplitude of the reference signal generated in the howling suppression method provided by the invention on any frequency point is lower than the sound intensityof the same frequency point on the hearing threshold curve, the reference signal is not perceived by audiences after being played together with the first signal, high fidelity is achieved, and the generation of howling is suppressed.

Description

technical field [0001] The present application relates to the technical field of digital signal processing, in particular, to a howling suppression method, device, sound system and public address system. Background technique [0002] In the sound reinforcement system, the signal collected by the microphone is transmitted to the speaker for amplification and playback, and the audio signal played by the speaker will be picked up again by the microphone. The transmission and feedback of the audio signal between the speaker and the microphone constitute an acoustic loop. During transmission, when the volume is high, the sound feedback loop forms a positive feedback, that is, the acoustic loop gain is greater than 1. The sound is amplified step by step in the continuous feedback, resulting in a piercing howling sound, which seriously affects the user's listening experience. At present, for howling suppression methods in sound reinforcement systems such as frequency shifting and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04R1/20
CPCH04R1/20
Inventor 刘忠志马奎高
Owner KTMICRO ELECTRONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap