Tighten transition band when tuner bandwidth is narrow#166
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mossmann wants to merge 1 commit intomiek:masterfrom
Closed
Tighten transition band when tuner bandwidth is narrow#166mossmann wants to merge 1 commit intomiek:masterfrom
mossmann wants to merge 1 commit intomiek:masterfrom
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Owner
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What a coincidence! I had been wondering about just such a hypothetical situation too. I think this change would solve that sort of problem very well, thank you! |
Owner
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Also, 6797a24 should help make the frequency plot more readable for narrow bandwidths. |
Contributor
Author
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Oh, nice! I actually attempted 6797a24 myself, but the right way to do it eluded me. |
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Let's say, hypothetically speaking, you wanted to use the derived frequency plot on one of the 300 baud carriers of a V.21 modem connection captured at 44100 samples per second. The channel bandwidth is very narrow compared to the sample rate, so the adjacent channel interferes with demodulation due to the fixed transition bandwidth of the tuner filter. This patch makes the transition bandwidth equal to the cutoff frequency when the tuner bandwidth is narrow and leaves things unchanged when the tuner bandwidth is wide.