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In our design, an amalgamated-signal cymometer is
developed with a TMS320F28335
DSP chip ---- we use its on-chip 12-bit 16-channel AD to conduct a novel
dual-sequencer synchronize sampling and averaged to improve the accuracy.
Considering the algorithm, we use TI's C28x_FPU_Lib to conduct a FFT with
sampled results and correct spectrum with Time-Shift Phase Difference
Correcting Spectrum Method based on
all-phase spectral analysis. Namely, we design a sampling-frequency
self-adaption algorithm which makes operation keep on without outside-hardware
command. Actually, the test result shows that our design's frequency resolution
ratio is up to 0.4%, and the maximum frequency’s D-value between main and minor
signal is up to 29.99 kHz.