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Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC
From: |
Joseph DiVerdi |
Subject: |
Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC |
Date: |
Fri, 30 May 2003 16:13:05 -0600 |
At 3:07 AM +0100 5/30/2003, Henrique Miranda wrote:
>Joseph,
>
>After some calculations I came with the following procedure:
>
>1: The Nyquist region can be obtained using n = floor(fc/B + 1/2)
> where floor(x) rounds x towards minus infinity, fc is the
> IF center frequency and B the signal bandwidth.
>
>2: The minimum fs can then be easily obtained by fs = (2*fc+B)/n
>
>3: If the optimum fs is intended use fs = 4*fc/(2*n-1) instead.
>
>Moreover, if (fc/B + 1/2) is an integer, then minimum fs equals
>the optimum fs.
>
>If you find some inconsistency in this procedure please let me know.
>Henrique
Dear Henrique,
No inconsistencies found. I had to brush up on my algebra of inequalities
(aarghh!) but I agree with your equations #1 & #2. Nicely done and thank you
again.
However, I must admit that I still don't fully appreciate what qualities make a
particular fs "optimum".
Best regards,
Joseph
--
Joseph A. DiVerdi, Ph.D., M.B.A.
http://xtrsystems.com/ 970.980.5868 (voice)
PGP Key ID: 0xD50A9E33
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC, (continued)
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC, Joseph DiVerdi, 2003/05/27
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC, Henrique Miranda, 2003/05/28
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC, Joseph DiVerdi, 2003/05/28
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC, Henrique Miranda, 2003/05/29
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC, Joseph DiVerdi, 2003/05/29
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC, Henrique Miranda, 2003/05/29
- Re: [Discuss-gnuradio] USB2 <-> fast ADC & DAC,
Joseph DiVerdi <=
- [Discuss-gnuradio] Brooktree / Conexant video capture, Robert Kelley, 2003/05/31