Sine wave generation circuit and audio shield

Abstract

The invention discloses a sine wave generation circuit and an audio shield having the sine wave generation circuit. The sine wave generation circuit comprises a power source input end, a micro controller, a waveform generation module, a filtering shaping module and a sine wave output end. According to the sine wave generation circuit, high level or low level signals are sequentially outputted through at least two input / output ports within a quarter of a sine period by the micro controller while square wave signals with successively-increased amplitude or successively-decreased amplitude are correspondingly generated by the waveform generation module within the quarter of the sine period, after filtering and shaping the square wave signals through the filtering shaping module, sine wave signals are outputted, so when the audio shield and audio equipment carry out communication, the stable and smooth sine wave signals are outputted by the sine wave generation circuit to the audio equipment to improve the communication speed and communication reliability of the audio shield, moreover, the sine wave generation circuit has advantages of no need for D / A conversion, simple and reasonable circuit structure and low design cost.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a sine wave generating circuit and an audio shield. Background technique [0002] At present, most audio shields generate sine wave signals through sine wave generation circuits, and send the sine wave signals to audio equipment to communicate with audio equipment. However, the existing sine wave generation circuits convert digital square waves into The signal is converted into an analog sine wave signal. The structure and design scheme of the sine wave generation circuit realized by D / A conversion are relatively complicated, and the design cost is relatively high. Contents of the invention [0003] The main purpose of the present invention is to propose a sine wave generating circuit and an audio shield, aiming at simplifying the structure of the sine wave generating circuit, reducing the design cost, and improving the speed and reliability of the audio shield communicat...

AI Technical Summary

Problems solved by technology

[0002] At present, most audio shields generate sine wave signals through sine wave generation circuits, and send the sine wave signals to audio equipment to communicate with audio equipment. However, the existing sine wave generation circuits convert digital square waves into The signal is converted into an analog sine wave signal. The structure and design scheme of the sine wave generation circuit realized by D / A conversion are relatively complicated, and the design cost is relatively high.

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