Wireless microphone based on Bluetooth BLE transmission

Abstract

The invention relates to the technical field of audio processing devices, and particularly relates to a wireless microphone based on Bluetooth BLE transmission. A data processing and control module encodes and compresses an audio signal, and a Bluetooth BLE module transmits the audio signal encoded and compressed by the data processing and control module to electronic mobile equipment through a Bluetooth BLE mode, instead of traditional Bluetooth audio transmission modes such as BR / EDR. The wireless microphone can be applied to, for example, mobile phones, Bluetooth speakers, loudspeakers andthe like, can further achieve the transmission and playback of audios, and can meet a wide range of application requirements, such as karaoke entertainment, square dancing and the like; moreover, theBluetooth BLE has low power consumption, low cost and higher applicability, and cannot be restricted by the traditional Bluetooth applications such as BR / EDR; and an original audio signal is subjectedto digital AD sampling, the data processing and control module uses processor compression, digital error correction and compensation algorithms, and also combines with a traffic control algorithm forpackaging, thereby, the sound quality can be guaranteed, good scalability and compatibility can be achieved, and strong practical values and market promotion values can be realized.

Description

technical field [0001] The invention relates to the technical field of audio processing devices, in particular to a wireless microphone based on Bluetooth BLE transmission. Background technique [0002] Microphone (also known as microphone, microphone or microphone) is an energy conversion device that can convert sound signals into electrical signals; with the popularization of entertainment projects such as karaoke, the application of microphones is becoming more and more extensive and mature. [0003] Nowadays, wireless microphones are often used in many lectures and classroom teaching. Wireless microphones use radio carrier waves to transmit signals. They are not bound by audio wires when used, and are flexible and convenient to use. Therefore, they are widely used by people. [0004] However, the existing wireless microphones are generally only used as karaoke, and only have a single function of transmitting and receiving voice signals. The function is single and cannot ...

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Problems solved by technology

[0004] However, the existing wireless microphones are generally only used as karaoke, and only have a single function of transmitting and receiving voice signals. The function is single and cannot be used in other occasions, such as outdoor audio, and cannot be compared with the current popular and commonly used electronic mobile microphones. It is difficult to expand the function when the equipment is used in combination

[0005] In addition, the current wireless microphones currently on the market generally use U-band, V-band or 2.4G frequency band, and FM frequency band. The signal modulation method is generally directly modulated by analog signals, and there are also 2.4G digital communication Complete the audio conversion between the sending and receiving ends, but the receiving end must use specific equipment, which is not universal

[0006] At the same time, since non-universal wireless communication methods are generally used, that is, both ends of the transceiver must be equipped with transceiver modules with the same modulation mode, that is, the transmission and reception must be matched. The receiving module using the U segment is also not universal

[0007] Moreover, due to the direct modulation of analog signals, it is also necessary to ensure that the modulation coefficients are the same or the deviation is not large, so as to ensure the distortion of the waveform. It is so difficult to guarantee the loss of the audio signal during transmission. The sound signal is converted into an electrical signal and attenuated during transmission, resulting in The sound is distorted, and at the same time, the analog signal modulation has poor anti-interference performance, and is prone to noise caused by external interference. The sound is intermittent, the sound quality is difficult to guarantee, and even crosstalk may occur, so digital technology management cannot be realized.

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