K-song system, wireless microphone and signal transmission device thereof

Abstract

A K-song system A wireless microphone and a signal transmission device thereof, the signal transmission device comprises a transmitting end and a receiving end, the transmitting end includes a pickup,AD converter, modulation unit, RF Amplifiers and Transmitter Antennas, The receiving end comprises a receiving antenna, low noise amplifier, signal processing unit, first DA converter, the demodulation unit and the second DA converter, At that transmit end, the audio signal is converted into a digital audio signal by an AD convert, A modulation unit modulates the digital audio signal into a high-frequency digital signal, A high-frequency digital signal is transmitted after being power-amplified, the high frequency carrier signal is canceled at the receiving end by the inverted high frequencycarrier signal generated by the signal processing unit, The first DA converter performs digital-to-analog conversion, the demodulation unit restores the digital audio signal, and the second DA converter converts the digital audio signal into an audio signal for output without compressing and expanding the audio signal, so as to improve the quality of the output audio signal.

Description

technical field [0001] The invention relates to the field of audio technology, in particular to a signal transmission device of a wireless microphone, a wireless microphone and a karaoke system. Background technique [0002] Usually, the transmitting part of the wireless microphone is powered by a battery, and the pickup converts the sound into an audio electrical signal, and after compression processing by the internal circuit, the radio wave containing the audio information is transmitted to the surrounding space through the transmitting antenna. The receiving part of the wireless microphone is generally powered by the mains, and receives the radio waves from the transmitting part through the receiving antenna, and then demodulates and expands the internal circuit to extract the audio signal, and sends it to the sound reinforcement system through the output signal line. In order to complete the wireless transmission of audio signals. [0003] In order to ensure that the s...

AI Technical Summary

Problems solved by technology

The signal distortion and harmonic changes brought about by the compression and expansion of the audio analog signal will greatly reduce the performance of the pickup, and the complexity of the circuit and the complexity of the implementation process also make it difficult to achieve the microphone signal output by the existing analog signal wireless microphone system. Singers need to perform freely, not only the stability is poor, but the listening fatigue caused by noise, noise and distortion also greatly reduces the user experience

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