Voice-frequency signal preprocessing device of radio sound transmitting equipment

A preprocessing device, a technology for audio signals, applied in transmission systems, ultrasonic/sonic/infrasonic transmission systems, electrical components, etc., can solve problems such as poor adaptive processing ability of voice signals, whistling, and inability to transmit voice signals.

Inactive Publication Date: 2004-07-14
赵锦伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing wireless microphone equipment has poor adaptive processing ability for the picked up voice signal. If the user speaks close to the microphone, it is easy to produce whistling. If the user speaks away from the microphone, the noise increases or the voice signal cannot be transmitted.

Method used

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  • Voice-frequency signal preprocessing device of radio sound transmitting equipment
  • Voice-frequency signal preprocessing device of radio sound transmitting equipment
  • Voice-frequency signal preprocessing device of radio sound transmitting equipment

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Embodiment Construction

[0013] see figure 1 , The voice pre-processing device includes: a pre-emphasis circuit; an audio amplifier circuit; an equalizer; a phase-shifting circuit and a high-bass band-pass filter. After the voice signal picked up by the diversion port and the microphone is pre-emphasized, it is amplified by the audio amplifier circuit, and the audio amplifier circuit controls its feedback amount according to the coded signal of the CPU unit to automatically adjust the output amplitude of the audio signal, that is, when the audio amplifier When the output signal is too large, it will be sent to the CPU unit through the A / D converter, and after the judgment, the CPU unit will output the coded signal, which will be sent to the negative feedback branch of the audio amplifier through the D / A converter, so that the feedback amount will increase and the gain will decrease; When the output signal of the audio amplifier is too small, it will be sent to the CPU unit through the A / D converter. A...

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Abstract

A voice-frequency signal preprocessing device includes: pre-emphasis circuit, voice-frequency amplification circuit, equalizer, phase-shift circuit and high-pitched and low-pitched voice band-pass filter. The voice-frequency amplification circuit uses CPU unit to control its gain, and the CPU unit can output code signal to said voice-frequency amplification circuit and control its feedback quantity according to detection result of its amplification output signal, and regulate the amplitude of voice-frequency signal. The equalizer and make phase-shift of its output signal, and make it lag at 90 deg. Said invention can make strong/weak voice frequency signal amplitude equally output, can eliminate the whistling due to signal superposition so as to extend the distance (range) of using mike by a user.

Description

technical field [0001] The invention relates to an audio signal preprocessing device, in particular to an audio signal preprocessing device of a wireless acoustic transmission device. Background technique [0002] Existing wireless microphone equipment usually consists of a speech processing part, a modulating part, an oscillating part, and a radio frequency part, and the speech signal is transmitted wirelessly through amplitude modulation or frequency modulation processing. Therefore, wireless microphones are suitable for various environments, especially suitable for use in teaching, reporting, interviews, performances, karaoke and other environments. However, existing wireless microphone devices have poor adaptive processing capabilities for picked up voice signals. If the user speaks close to the microphone, whistling will easily occur. If the user speaks away from the microphone, the noise will increase or the voice signal cannot be transmitted. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B11/00
Inventor 赵锦伟颜海南
Owner 赵锦伟
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