[email protected] said: > Could you please clarify then exactly what "decimate" means in this context.
Perhaps an example will help. Consider an audio input system. You want 0-20 kHz, so you need 40 k samples/second. You also need a sharp cutoff filter at 20 kHz. An alternative approach is to sample at 160 k samples/second and implement the filter in software. You still need an external anti-aliasing filter, but this one doesn't need to be sharp cutoff - just good enough to eliminate everything over 80 kHz. But now you have 160 k samples/second when you only want 40. The answer is to throw away 3 out of 4 samples. That's decimation or downsampling. You can downsample at non-integer rates by interpolating. You can gain bits/sample with this sort of setup. I'm not sure how to explain it. -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
