A method and device for directional sound transmission using dual microphones
A technology of dual microphones and microphones, applied in the direction of microphone port/microphone accessories, sensors, sensor parts, etc., can solve the problems of difficult to achieve filtering effect, conflicting flexibility requirements, poor voice effect of first-order differential microphones, etc.
Active Publication Date: 2017-05-17
BEIJING PHILISENSE TECH
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is: the voice effect of the first-order differential microphone based on time-domain processing is not good, specifically: the voice collected by the existing first-order differential microphone array, when doing delay processing, the two microphone samples The delay of the point is an integer number of samples, which requires precise control of the physical distance between the two microphones, which conflicts with the flexibility of the process; the low-pass filter is an inverse function of the frequency, and it is difficult for FIR or IIR filtering to achieve the filtering effect of a specific function
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[0049] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0050] The present invention uses the first-order differential microphone array and digital voice processing technology to collect sound with directionality, and provides a method and device for directional sound transmission using dual microphones. This method is convenient for hardware implementation and is suitable for digital conference systems. Directional sound is suppressed for directional sound transmission
[0051] Embodiment 1 of the present invention proposes a method for directional sound transmission using dual microphones, such as figure 1 shown, including the following steps:
[0052] Step 101, converting the voice signals collected by the front and rear microphones into two frequency domain signals to obtain a first frequency domain signal and a second frequency domain signal;
[0053] Step 102, acquiring forward directivity data and re...
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The invention relates to a method and device for achieving orientation voice transmission through two microphones. The method comprises the steps of converting voice signals collected by the front microphone and the rear microphone into two frequency domain signals to obtain the first frequency domain signal and the second frequency domain signal, calculating front directivity data and rear directivity data of the first frequency domain signal and the second frequency domain signal, combining the directivity data, conducting low-pass filtering on the combined frequency domain signals, and converting the filtered signals into time domain signals for voice output. According to the method and device for achieving orientation voice transmission through the two microphones, a front microphone array, a rear microphone array and a digital voice processing technology are utilized, voices are collected in a directivity mode, the voices in the specific direction are lowered, orientation voice transmission is carried out, voice definition is improved, the voice amplification quality is ensured, and the method facilitates hardware implementation and is applicable to a digital conference system.
Description
technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a method and device for directional sound transmission using dual microphones. Background technique [0002] The microphone is placed in a place with high noise. The ambient noise and the voice of the speaker are collected by the microphone at the same time, which affects the voice quality. A conference system based on digital sound reinforcement, with multiple speakers and multi-channel microphone voice input. When the participants are adjacent and speak at the same time, the microphone in front of each speaker will collect the adjacent speaker from the side. The voice signal collected by multiple channels in this way is mixed by the audio processor, and then played out through the speaker, resulting in a decrease in voice clarity and affecting the sound reinforcement quality of the digital conference system. [0003] Noise processing has always been a technic...
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IPC IPC(8): H04R1/08H04R3/00
Inventor 杨振华曹忻军陈洪顺汪法兵
Owner BEIJING PHILISENSE TECH