Microphone system circuit

Abstract

The invention discloses a microphone system circuit. At a receiver circuit side, a radio frequency signal used as a frequency-sweeping channel is distributed from a signal of a first antenna, the radio frequency signal is demodulated through an amplified and frequency-mixed intermediate frequency signal, the output radio frequency signal intensity voltage is conveyed to a MCU receiver to perform detection and is used as a frequency-sweeping field intensity voltage, and a certain point of voltage value is set as the threshold voltage of the idle frequency; when the frequency-sweeping field intensity voltage is less than the threshold voltage of the idle frequency, the voltage is identified as idle frequency, otherwise, the voltage is identified as the interference frequency; when the receiver circuit judges that the working frequency is interfered, the idle frequency stored in the MCU receiver can be automatically called; and meanwhile, the receiver circuit sends the information for changing the frequency to the external through a first radio frequency chip; when a second radio frequency chip of an emitter circuit receives the information for changing the frequency, a MCU emitter can change the emission frequency according to the received information instruction to realize the automatic frequency pairing function, the interference frequency can be avoided so as to guarantee thenormal use of the microphone.

Description

technical field [0001] The invention relates to the field of microphones, in particular to a microphone system circuit. Background technique [0002] The microphone is an energy conversion device that converts sound signals into electrical signals, and is also called a microphone or a microphone. In the 20th century, the microphone developed from resistive conversion of sound and electricity to inductive and capacitive conversion, and a large number of new microphone technologies gradually developed, including aluminum ribbon, dynamic coil and other microphones, as well as the widely used condenser microphones and electret microphones. body microphone. Nowadays, wireless microphones are more and more widely used because they are easy to carry and have no cumbersome winding. However, various interference factors often appear in the surrounding environment, which will affect the normal use of wireless microphones. Contents of the invention [0003] In order to solve the ab...

AI Technical Summary

Problems solved by technology

Nowadays, wireless microphones are more and more widely used because they are easy to carry and have no cumbersome winding. However, various interference factors often appear in the surrounding environment, which will affect the normal use of wireless microphones.

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