Microphone internally provided with crystal oscillator and Bluetooth circuit board

Abstract

The invention discloses a microphone with a built-in crystal oscillator and a bluetooth circuit board, comprising: an acoustic sensing unit for capturing sound and converting it into an electrical signal; a signal processing unit connected with the acoustic sensing unit for receiving the acoustic signal After the signal of the sensing unit is processed, it is output through a first output pin; a crystal oscillator unit is used to provide a signal of the first set frequency band; a frequency division unit is connected with the crystal oscillator unit to The signal of the first set frequency band is frequency-divided and then output through a second output pin. The above technical solution has the following advantages or beneficial effects: by using a larger frequency crystal oscillator instead of a 16MHz crystal oscillator, using the characteristics of a larger frequency crystal oscillator occupying a smaller area, the crystal oscillator is integrated into the microphone, and the microphone with the built-in crystal oscillator is integrated into the Bluetooth circuit board Finally, the area of ​​the Bluetooth circuit board can be reduced to meet the needs of electronic product integration and miniaturization.

Description

technical field [0001] The invention relates to the field of micro-electromechanical technology, in particular to a microphone with a built-in crystal oscillator and a bluetooth circuit board. Background technique [0002] As a radio technology that supports short-distance communication of devices, Bluetooth has long been ubiquitous in our daily life. Smart hardware devices such as smart phones, smart bracelets, smart watches, smart desk lamps, smart headphones, and smart rice cookers are actually all using Bluetooth technology transmission. [0003] In the Bluetooth system, the circuit board mainly includes the main chip, microphone, crystal oscillator and antenna. The crystal oscillator provides the reference frequency signal in the Bluetooth circuit and is the core component that supports wireless Bluetooth technology to achieve fast transmission. The most commonly used in wireless Bluetooth is the 16MHZ crystal oscillator. With the convenience, miniaturization, and ultr...

AI Technical Summary

Problems solved by technology

The most commonly used in wireless Bluetooth is the 16MHZ crystal oscillator. With the convenience, miniaturization, and ultra-thin small size of high-end smart products, more and more users will choose crystal oscillators with smaller package sizes, but in the existing technical conditions The size of the lower crystal oscillator cannot be further reduced, and the microphone and antenna cannot be integrated into the main chip, which affects the further miniaturization of the Bluetooth circuit board and restricts the development trend of further portable, miniaturized, and integrated electronic products.

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