[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*To*: linrad@xxxxxxxxxxxxxxxxxxxxxx*Subject*: Re: [linrad] RE: Silly question or is it?*From*: w3sz <w3sz@xxxxxxxxxxx>*Date*: Mon, 13 Jan 2003 20:26:42 -0500*References*: <CFEIKLJOPPJLBFPEJHKOIEJMCNAA.leif.asbrink@xxxxxxxxxxxxxxxxxx>*Reply-to*: linrad@xxxxxxxxxxxxxxxxxxxxxxxxxxx*Sender*: owner-linrad@xxxxxxxxxxxxxxxxxxxxxx*User-agent*: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0

As for the question:

Changing Just Second Forward FFT routine from [2] to [1] to [0]: [2] gives 17.2 second total delay, 10.92 sec FFT2 delay, 59.4% CPU load [1] gives 6.89 second total delay, 2.73 sec FFT2 delay, 61.5% CPU load [0] gives 6.90 second total delay, 2.73 sec FFT2 delay, 63.9% CPU loadthe delay with [2] really surprised me! (though I know there is a simplereason it shoudn't have done so).Are you sure that nothing was changed in the AFC or baseband parameters? There should be nearly no difference at all in total delay depending on the different fft versions. If the total delay really is different (by more than 0.1 second) on your fast computer, please give me detailed information because then you have (again) detected a bug;)

Here are my parameters: First FFT bandwidth (Hz) [50] First FFT window (power of sin) [3] First forward FFT version [5] First FFT storage time (s) [20] First FFT amplitude [300] Enable second FFT [1] First backward FFT version [0] First backward FFT att. N [8] Second FFT bandwidth factor in powers of 2 [6] Second FFT window (power of sin) [2] Second forward FFT version [1] Second forward FFT att. N [8] Second FFT storage time (s) [30] Enable AFC/SPUR/DECODE [1] AFC lock range Hz [150] AFC max drift Hz/minute [100] Enable morse decoding [0] Max no of spurs to cancel [100] Spur timeconstant (0.1sek) [5] First mixer bandwidth reduction in powers of 2 [4] First mixer no of channels [1] Baseband storage time (s) [200] Output delay margin (0.1sek) [5] Output sampling speed (Hz) [6000] Default output mode [55] Audio expander exponent [3] A/D speed [96000] Check [1110038]

73, Roger -- Roger Rehr W3SZ 2 Merrymount Road Reading, PA 19609 http://www.qsl.net/w3szLINRADDARNIL

**Follow-Ups**:**[linrad] RE: Silly question or is it?***From:*Leif Asbrink

- Prev by Date:
**Re: [linrad] DATA Base.** - Next by Date:
**[linrad] RE: Silly question or is it?** - Previous by thread:
**Re: [linrad] DATA Base.** - Next by thread:
**[linrad] RE: Silly question or is it?** - Index(es):