A realization method of generating sine wave signal with dsp controller

Abstract

The invention relates to an implementation method for generating sine wave signals through a DSP controller. The implementation method includes the steps that firstly, parameters are set, the number N of sampling points in one sine wave signal cycle and the angle value theta of each sampling point are calculated, and a quintic polynomial approaching a sine function is worked out according to the projection theorem method in the optimization theory; then, the numerical value f0 of discrete points of the sine wave signals is calculated in real time according to different intervals where the sampling points n are located; then, the calculated numerical value f0 of the discrete points of the sine wave signals is sent into a DAC conversion circuit through the DSP controller, and continuous sine wave current signals are generated; finally, the continuous sine wave current signals are converted into continuous sine wave voltage signals through a UA operational amplifier, and thus output of the sine wave signals is achieved. By means of the implementation method, accumulative errors caused by continuous recursive calculation are reduced, the calculation procedure is simplified, the calculation time of the DSP controller is shortened, occupied storage space in the DSP controller is small, cost is lowered, waveform approximation is achieved, and precision is high.

Description

technical field [0001] The invention belongs to the realization field of wave signals, in particular to a realization method for generating sine wave signals with a DSP controller. Background technique [0002] Sine wave signal generators have been widely used in signal processing systems in the fields of communication, instrumentation, and industrial control. There are many digital implementation methods for generating sine wave signals based on DSP controller, the difference mainly lies in the difference of generation algorithm and software. There are three commonly used methods: look-up table method, Taylor series expansion method and iteration method. [0003] The look-up table method is the most direct digital implementation method. The designer can pre-calculate all possible sine function values ​​according to the needs of the operation, and arrange these results into a data table. The function value of . The look-up table method is characterized by fast speed and e...

AI Technical Summary

Problems solved by technology

The accuracy of Taylor series calculation depends on the number of expansion items and the angle value θ corresponding to the point: the more the number of expansion items, the higher the accuracy, but the longer the calculation time, the more time it takes for the DSP controller; the smaller the angle value θ corresponding to the point , the higher the accuracy is, but the accuracy will inevitably decrease as the angle value θ corresponding to the point increases.

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