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Red Hat Bugzilla – Attachment 575493 Details for
Bug 810347
Incorrect sampling rate used for 300 baud AFSK
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[patch]
Optional patch to make the demodulator filters longer and more robust (AFSK)
soundmodem-0.16-increase-rx-filters-parameters.patch (text/plain), 922 bytes, created by
g.trentalancia
on 2012-04-05 16:37:45 UTC
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Description:
Optional patch to make the demodulator filters longer and more robust (AFSK)
Filename:
MIME Type:
Creator:
g.trentalancia
Created:
2012-04-05 16:37:45 UTC
Size:
922 bytes
patch
obsolete
>This patch might be useful for successful reception at 300 baud. > >It uses longer RX filters and it also makes them supposedly more >robust against overflows. >--- > afsk/modem.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > >--- soundmodem-0.16-fix-samplerate/afsk/modem.c 2012-03-03 19:14:53.748535161 +0100 >+++ soundmodem-0.16-fix-samplerate-and-rxfilters/afsk/modem.c 2012-03-03 19:16:34.066638207 +0100 >@@ -248,7 +248,7 @@ struct modulator afskmodulator = { > * Rx FIR Filter length is normally equal > * to 16. > */ >-#define RXFILTLEN 16 >+#define RXFILTLEN 48 > > /* > * Rx FIR Filter length is normally equal >@@ -256,7 +256,7 @@ struct modulator afskmodulator = { > * the minimum wordlength to avoid > * overflow. > */ >-#define RXFILTOVERBITS 3 >+#define RXFILTOVERBITS 5 > > #define RXFILTOVER (1<<(RXFILTOVERBITS)) > #define RXFILTFIDX(x) (((x)>>(16-(RXFILTOVERBITS)))&(RXFILTOVER-1))
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