Re: [Flexradio] 11.025 KHz IF question

2006-05-05 Thread richard allen
Thanks, guys. It's been jogged. The value of the number was obvious. I'd forgotten about the roll off. Richard W5SXD Frank Brickle <[EMAIL PROTECTED]> wrote: (05/04/2006 22:51) >44100 is the CD data rate (48000 is the DAT rate) > >44100 complex samples/sec -> +/-22050Hz passband > >22050/2 =

Re: [Flexradio] 11.025 KHz IF question

2006-05-05 Thread Christopher T. Day
t: Re: [Flexradio] 11.025 KHz IF question 44100 is the CD data rate (48000 is the DAT rate) 44100 complex samples/sec -> +/-22050Hz passband 22050/2 = 11025 -> center of positive freqs You want IF (11025) rather than baseband because soundcards roll off towards 0Hz. That jog it? 73

Re: [Flexradio] 11.025 KHz IF question

2006-05-04 Thread Frank Brickle
44100 is the CD data rate (48000 is the DAT rate) 44100 complex samples/sec -> +/-22050Hz passband 22050/2 = 11025 -> center of positive freqs You want IF (11025) rather than baseband because soundcards roll off towards 0Hz. That jog it? 73 Frank AB2KT richard allen wrote: > Would someone pl

Re: [Flexradio] 11.025 KHz IF question

2006-05-04 Thread Jim Lux
At 07:11 PM 5/4/2006, richard allen wrote: >Would someone please refresh my memory as to the derivation of the 11. >025 kHz value? 1/4 of 44.1 kHz, the sampling rate for audio CDs. >Richard, W5SXD > >___ >FlexRadio mailing list >FlexRadio@flex-radio

Re: [Flexradio] 11.025 KHz IF question

2006-05-04 Thread richard allen
Would someone please refresh my memory as to the derivation of the 11. 025 kHz value? Richard, W5SXD ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-

Re: [Flexradio] 11.025 KHz IF question

2006-05-03 Thread Eric Wachsmann - FlexRadio
Behalf Of Tim Ellison > Sent: Wednesday, May 03, 2006 5:54 PM > To: FlexRadio@flex-radio.biz > Subject: [Flexradio] 11.025 KHz IF question > > The question is are we always going to be stuck with the 11.025 KHz IF? > If running @ 96K (as opposed to 48K), can't a 22.050 KHz IF be

[Flexradio] 11.025 KHz IF question

2006-05-03 Thread Tim Ellison
The question is are we always going to be stuck with the 11.025 KHz IF? If running @ 96K (as opposed to 48K), can't a 22.050 KHz IF be theoretically used or is 22 KHz too high for the sound cards to process linearly? -Tim --- Tim Ellison Integrated Technical Services