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Re: External sound cards for SDR's

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  • jorschei
    Hi Dave, A good job, me be the better solution for a high cost soundcard. I am interested in the results when operational let us now. A modulair bulding blok
    Message 1 of 37 , Mar 13, 2010
    • 0 Attachment
      Hi Dave,

      A good job, me be the better solution for a high cost soundcard.
      I am interested in the results when operational let us now.
      A modulair bulding blok for sdr receivers !!!.

      73' Joris PE1KTH.

      --- In softrock40@yahoogroups.com, Dave - WB6DHW <brainerd@...> wrote:
      >
      > Ed:
      > A group of us are developing the SDR-Widget. It will have an AK5394A
      > dual A/D, an AK4382 dual D/A. Also on board will be an AVR AT32UC3A3
      > processor which will provide complete rig control as well as a high
      > speed USB 2.0 interface . I am currently laying out the first prototype
      > board. Others will be doing the software.
      >
      > Dave - WB6DHW
      > <http://wb6dhw.com>
      >
      > Marciniak, Ed wrote:
      > >
      > >
      > > With two channels in, two channels out at 192ksps, that's
      > > approximately 18mbits/sec total + usb overhead. Very doable on usb 2.0
      > > high speed, but not full speed.
      > > The main drag on the external usb2.0 sound cards that are not >500 USD
      > > is that they inevitabely use a crummy adc/dac codec on a single chip.
      > > There are a few chips out there that support more channels or better
      > > adc chips, but none of them (that I've found) can take 192khz 24 bit.
      > > The noise floor of the all in one chips is not much better than
      > > motherboard or laptop internal sound cards.
      > >
      > > Something with an AK5394A adc would be your preferred solution. Yes
      > > you can use more op amp gain to wash out the noise floor, but you pay
      > > in dynamic range.
      > >
      > > ------------------------------------------------------------------------
      > > *From*: softrock40@yahoogroups.com <softrock40@yahoogroups.com>
      > > *To*: softrock40@yahoogroups.com <softrock40@yahoogroups.com>
      > > *Sent*: Sun Nov 15 14:30:32 2009
      > > *Subject*: Re: [softrock40] External sound cards for SDR's
      > >
      > >
      > > jeff millar wrote:
      > > >
      > > >
      > > > Mr Doug - wrote:
      > > > >
      > > > >
      > > > > Firewire is nice but usb2 is probably just a good and more convenient,
      > > > > Linux support is nice. B is this card really worth twice as much as
      > > > > the emu 0202 ?
      > > >
      > > > USB V2.0 doesn't have enough bandwidth to work with 192 KHz sound cards.
      > > >
      > > Just making a gross estimate:
      > >
      > > Is this really true? 192Ks/s * 4 channels * 3 bytes/sample is ~2.5MB/s.
      > > That should easily be within the capability of USB 2.0 I'd think, unless
      > > there's something I'm naively missing.
      > >
      > > Dana K6JQ
      > >
      > >
      > >
      > >
      >
    • jorschei
      Hi Dave, A good job, me be the better solution for a high cost soundcard. I am interested in the results when operational let us now. A modulair bulding blok
      Message 37 of 37 , Mar 13, 2010
      • 0 Attachment
        Hi Dave,

        A good job, me be the better solution for a high cost soundcard.
        I am interested in the results when operational let us now.
        A modulair bulding blok for sdr receivers !!!.

        73' Joris PE1KTH.

        --- In softrock40@yahoogroups.com, Dave - WB6DHW <brainerd@...> wrote:
        >
        > Ed:
        > A group of us are developing the SDR-Widget. It will have an AK5394A
        > dual A/D, an AK4382 dual D/A. Also on board will be an AVR AT32UC3A3
        > processor which will provide complete rig control as well as a high
        > speed USB 2.0 interface . I am currently laying out the first prototype
        > board. Others will be doing the software.
        >
        > Dave - WB6DHW
        > <http://wb6dhw.com>
        >
        > Marciniak, Ed wrote:
        > >
        > >
        > > With two channels in, two channels out at 192ksps, that's
        > > approximately 18mbits/sec total + usb overhead. Very doable on usb 2.0
        > > high speed, but not full speed.
        > > The main drag on the external usb2.0 sound cards that are not >500 USD
        > > is that they inevitabely use a crummy adc/dac codec on a single chip.
        > > There are a few chips out there that support more channels or better
        > > adc chips, but none of them (that I've found) can take 192khz 24 bit.
        > > The noise floor of the all in one chips is not much better than
        > > motherboard or laptop internal sound cards.
        > >
        > > Something with an AK5394A adc would be your preferred solution. Yes
        > > you can use more op amp gain to wash out the noise floor, but you pay
        > > in dynamic range.
        > >
        > > ------------------------------------------------------------------------
        > > *From*: softrock40@yahoogroups.com <softrock40@yahoogroups.com>
        > > *To*: softrock40@yahoogroups.com <softrock40@yahoogroups.com>
        > > *Sent*: Sun Nov 15 14:30:32 2009
        > > *Subject*: Re: [softrock40] External sound cards for SDR's
        > >
        > >
        > > jeff millar wrote:
        > > >
        > > >
        > > > Mr Doug - wrote:
        > > > >
        > > > >
        > > > > Firewire is nice but usb2 is probably just a good and more convenient,
        > > > > Linux support is nice. B is this card really worth twice as much as
        > > > > the emu 0202 ?
        > > >
        > > > USB V2.0 doesn't have enough bandwidth to work with 192 KHz sound cards.
        > > >
        > > Just making a gross estimate:
        > >
        > > Is this really true? 192Ks/s * 4 channels * 3 bytes/sample is ~2.5MB/s.
        > > That should easily be within the capability of USB 2.0 I'd think, unless
        > > there's something I'm naively missing.
        > >
        > > Dana K6JQ
        > >
        > >
        > >
        > >
        >
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