TITLE:
Amalgamated-signal Cymometer Based on TMS320F28335
AUTHORS:
Z. Y. Xu, W. T. Lv, Z. Y. Li
KEYWORDS:
Digital Frequency Meter; Same Precision Measurement; DSP; All-phase Spectral Analysis; Sampling-frequency Self-adaption
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
November
18,
2013
ABSTRACT: 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 withTime-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.