The Research Of Direct Waveform Data Synthesis Of Multi-Component Signal

In many experiments, we only need to have a kind of incentive, and can use ordinary signal generator as an incentive. Unfortunately in practice, we will also meet another situation, excitation signal is formed by multiple independent signal synthesis,such as acoustic jamming signal. If using ordinary function generator, it needs to have more than one source to overlay and there will be many other problems such as large volume, inconvenient operation, hardness of synchronization.If we are to achieve this with arbitrary wave generator, parameter changes is very complicated. If we use pulse change way of low frequency band, the transient time is long, easy to distortion. As a result, this paper puts forward a kind of multi-component mixed signal waveform data directly synthesis method, and studies the feasibility of this method, key technology and implementation method of the circuit.Sine now can use DDS technology, and this needs to take up memory, latch,multiplier and other resources. Performance of FPGA in the rapid development in recent years, not only has a large number of logical resource, but also be embedded in a large amount of storage resources, multiplier resources, so the circuit synthesis is feasible by single chip FPGAimplementation of multi-component mixed signalIn order to make the multi-component mixed signal distortion as low as possible,we need to study the relationship of component amplitude, the sorting from big to small order and optimization. Based on the characteristics of digital circuit and component taking up hardware resources, we define the sinusoidal pulse and triangular three basic component types. What's more on the relationship between the component effective digit signal and the truncation, error is analyzed. Based on this, we advance the whole circuit diagram.This paper is based on the CYCLONE series III devices, for example, by way of schematic design a 28 Sine, 2 pulses, 2 triangle direct data synthesis of mixed signal circuit, and compiled through. It can be found that Sine wave components are strictlylimited by FPGA RAM, but the triangle, and the weight of the pulse number can be greatly extended at will. This paper theoretically studies the implementation method,this method is only applicable to low and middle frequency of the synthesis of multi-component mixed signal, the change of its parameters is convenient, and the realization of the hardware cost is low.