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Discussion Groups | TMS320C54x | Frequency multiplication on 5410
Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).
Frequency multiplication on 5410 - Leigh W. Wells - Sep 29 0:59:00 1999
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Hello and Good Day, I have a signal at 40KHz, which I need to convert to 20KHz. i plan to multiply the 40KHz by a sine wave at 60KHz and filter off the 100KHz resulting portion to leave a 20KHz signal. I am doing this on a TI TMS320C5410 DSP. Supposedly there is a sine table in the ROM. I am wondering about exactly how to proceed. I suppose I need to multiply each of my values by a value from the sine table, but how do I go about it? There will inevitably be a different number of values in the sin table than I have in one cycle of my 40KHz signal ( I am sampling at about 480KHz). Your help and advice on how to proceed is greatly appreciated. Leigh W. Wells Electrical Engineer Acoustic Positioning Research |
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