John Harrison, NI1B wrote:
Hi All,
If you have a sound card sampling at 48khz with no anti-aliasing
filter, and you have a tone spurious or otherwise coming into that card at
38khz the sampled data will have a tone at 10khz in its output that did
NOT EXIST at its input.
Yes, that's right, but are you sure they don't have an anti-alias filter at all ? Probably, given the fixed sampling
frequency of 48 kHz, they have just a fixed, simple RC network. If you don't need to switch the filter along with the
sampling frequency, you can build it simply and cheaply with just a few passive components.
73 Alberto I2PHD
.
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