Method for generating cosine differential signal

Abstract

The invention relates to a method for generating a cosine differential signal. The method comprises the steps of: calculating anticosine by using a DSP (digital signal processor), equally dividing a domain of definition [-1,1] into 10000 parts, namely, 10000 control pulses can be output within a period, converting each part into an IQ value, calculating an anticosine value according to the values of the equally divided values, wherein the anticosine value corresponds to an angle; converting the IQ values into a floating-point number, figuring out the angle difference of each part, multiplying the angle difference of each part by a coefficient, converting into an integer, storing the calculated value as an array DATA [10000], wherein the array value is used as the reference calculated by a CPU (Central Processing Unit) timer; enabling each value of the array to correspond to an actual pulse width, and interrupting the output through timing of a DSP timer to form a difference pulse signal capable of controlling the position of the motor. According to the method, the anticosine basic value is stored by adopting an array mode, and thus the operation time of the DSP is greatly reduced, and the output waveform is high in precision, stable, and high in reliability.

Description

technical field [0001] The invention relates to a method for generating a cosine differential signal. Background technique [0002] At present, the existing method to generate cosine signal is built by analog circuit, the hardware circuit is complicated, and the hardware circuit needs to be changed when changing the output waveform parameters, the output waveform is affected by the parameters of components, and the accuracy is not high. Contents of the invention [0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a technical solution for a method for generating a cosine differential signal. [0004] A kind of cosine differential signal generation method is characterized in that: Utilize DSP digital signal processor to calculate arccosine by C language programming; It can output 10,000 control pulses, each equal portion is converted into an IQ value, and the arccosine value is calculated according to the divided eq...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing method to generate cosine signal is built by analog circuit, the hardware circuit is complex, and the hardware circuit needs to be changed when changing the output waveform parameters, the output waveform is affected by the parameters of components, and the accuracy is not high

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