Microphone-based regulation circuit and microphone

Abstract

The invention relates to the technical field of voice signal processing, and particularly relates to a microphone-based regulation circuit and a microphone. An electrical signal acquired through an acquisition circuit is very weak. The electrical signal is amplified through a first amplifier. As the electrical signal through primary amplification still cannot drive a follow-up circuit, there is a need for secondary amplification of the electrical signal. In order to reduce attenuation of the high-frequency or low-frequency part of the electrical signal, before secondary amplification of the electrical signal, the unnecessary high-frequency or low-frequency component in the electrical signal is filtered through a regulation branch, and the electrical signal after filtering is amplified. Thus, the frequency domain response curve of the electrical signal is straight, and the quality of output sound of the microphone is improved. In the application, the frequency response of the high-frequency part of the microphone circuit is regulated through the regulation branch, so that the whole frequency response curve is 'dragged' straight, and the quality of output sound of the microphone is improved.

Description

technical field [0001] The invention relates to the technical field of sound signal processing, in particular to a microphone-based adjustment circuit and a microphone. Background technique [0002] Frequency response refers to the phenomenon that when an audio signal output at a constant voltage is connected to the system, the sound pressure collected by the microphone increases or attenuates as the frequency changes, and the phase changes with the frequency. This sound pressure and phase The associated variation with frequency is called the frequency response. It also refers to the frequency range that the sound system can reproduce within the range allowed by the amplitude, and the amount of signal change within this range is called the frequency response, also called the frequency characteristic. [0003] Frequency response is an evaluation criterion for the frequency response capability of the digital-to-analog / analog-to-digital converter in the microphone or acquisiti...

AI Technical Summary

Problems solved by technology

However, the frequency response of existing microphones is usually as follows figure 1 As shown in the frequency response curve, there will be a sharp rise and then a sharp drop in the high frequency part, which will make it difficult to reconstruct the signal in the high frequency part, so that the signal will usually attenuate in the low frequency band

The better the output quality of the device, the flatter the frequency response curve will be. On the contrary, it will not only attenuate quickly at high frequencies, but also may appear jittering in general frequency bands, which greatly reduces the quality of the microphone output signal.

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