Design of Signal Distortion Measurement System based on TMS320F2808

TMS320F2808 DSP chip as the core, combined with signal conditioning and keyboard scan peripheral circuits, made up the hardware circuit of the measuring system. As for software,DSP as the main controller, realized the data display,controlment and management about the whole system, Using the DSP internal integrated ADC module to achieve the data collection, while using its internal resources to complete the FFT algorithm and optimization. The field test results show that this measuring system of digital signal distortion realizes the amplitude and frequency display in time domain and frequency domain when the setting signal passed the test system, and the measuring error is less than 0.8 dB.