Multi-microphone audio mixing method and device

A sound mixing and microphone technology, applied in telephone communication, sensor components, sensors, etc., can solve problems such as misjudgment, signal-to-noise ratio reduction, and reverberation aggravation, so as to improve voice quality and channel misselection The effect of reducing the chance

Inactive Publication Date: 2011-05-11
ZTE CORP
View PDF2 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can alleviate channel switching when speakers in different positions speak at the same time, but its disadvantage is that because only the signal strength information is used, two or more physically adjacent channels will be opened when a single person speaks, resulting in signal loss. Reduced noise ratio, increased reverberation and slurred speech
[0008] The above audio mixing method judges the channel gating based entirely on the signal strength. In many application scenarios, the performance is low and misjudgment is prone to occur:
[0009] 1) In a typical array microphone application, such as figure 2 , when a speaker who is far away from the array microphone speaks, the difference in signal strength collected by each microphone in the array microphone device is very small, which leads to misjudgment when mixing
[0010] 2) Even in the application where the mic

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
  • Multi-microphone audio mixing method and device
  • Multi-microphone audio mixing method and device
  • Multi-microphone audio mixing method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Such as Image 6 As shown, it is a flow chart of the multi-microphone mixing method provided by Embodiment 1 of the present invention, which specifically includes:

[0064] S601. Count the signal strength of each input channel in the current period, and select two input channels A and B with the largest signal strength for voice detection;

[0065] S602. When the input channels A and B have no voice, directly adopt the last discrimination result;

[0066] S603. When input channel A has voice and B has no voice, that is, A is the voice input channel, and directly controls input channel A to be selected;

[0067] S604. When both input channels A and B have voice, that is, both A and B are voice input channels, preprocess the signals of channel A and channel B through a bandpass filter of 80 Hz to 800 Hz respectively, and preprocess the preprocessed signals Calculate the normalized cross-correlation function (NCCF) of the two signals, and determine the maximum value ρ(τ)...

Embodiment 2

[0085] Such as Figure 7 As shown, it is a flow chart of the multi-microphone sound mixing method provided by Embodiment 2 of the present invention.

[0086] S701. Count the signal strength of each input channel in the current period, and select two input channels A and B with the largest signal strength for voice detection;

[0087] S702. When the input channels A and B have no voice, directly adopt the last discrimination result;

[0088] S703. When input channel A has voice and B has no voice, directly control input channel A to be selected;

[0089] S704. When both input channels A and B have voice, the signals of channel A and channel B are preprocessed through a band-pass filter of 80 Hz to 800 Hz respectively, and the average amplitude difference function ( AMDF), and determine the minimum value ψ (τ) of the average amplitude difference function (AMDF) value, and determine the signal delay τ between A and B corresponding to this moment (i.e. the minimum value of the a...

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 relates to the field of audio information processing, and discloses a multi-microphone audio mixing method and device, which can reduce the misjudgment rate of gating of input channels and improve the audio quality after audio mixing. The method comprises the following steps: counting the signal intensity of each input channel at the current time, selecting out at least two input channels with the maximum signal intensities for carrying out voice detection; determining the detected input channels with voice as voice input channels; when at least two voice input channels are determined, determining the similarity of signals between the voice input channels; controlling the gating of the voice input channels according to the similarities of the signals; and carrying out weighted audio mixing on the signals of the gated voice input channels and outputting.

Description

technical field [0001] The invention relates to the field of audio information processing, in particular to a multi-microphone sound mixing method and device. Background technique [0002] In the video conferencing system, it is necessary to use a microphone to collect the voice of the local speaker. The voice is encoded and transmitted to the remote end. After being decoded in the remote system, it is output to the speaker through a power amplifier for playback. In order to reduce the influence of room reverberation and background noise, a directional microphone is generally used to collect sound (ie pick up sound) in a video conferencing system. Since the directional microphone has the best sound pickup effect in the direction directly facing the microphone, in order to ensure good sound pickup effect when speakers from different directions speak, generally multiple directional microphones are needed to collect the voices of speakers from different directions. The pickup ...

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): H04R3/00
CPCH04R3/005H04M3/568
Inventor 彭远疆
Owner ZTE CORP
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