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Re: Not quite right.

Howdy

You said "... Could have been a sawtooth, ramp, triangle or square wave." But this isn't true. It had to be band limited before conversion so those don't apply.

That's part of what I was trying to get at by stressing the band limiting in my first post.

Also a proper reconstruction filter is the same as a proper antialiasing filter: ideally it passes all freqs less than the Nyquist rate unchanged and eliminates all higher freqs. There are better and worse implementations (approximations) to this in practice and you described one of the worst.

-Ted

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