Subject: Re[2]: [linux-audio-dev] Just a thought about a possible hardware hack
From: Rick Burnett (destinytech_AT_spacey.net)
Date: Sat Jun 09 2001 - 17:39:50 EEST
I find it very hard to beleive that the crystal is in the chip. I
design chips and I have never seem them put a crystal inside the
package. The three things that they could do is build an oscillator out
of silicon, use a clock divider and slow down a clock coming in, or
use a PLL to speed up a clock. My assumption would be that there is a
crystal being used somewhere because the onboard oscillator and PLL
ideas have jitter and that is not something you want in audio
playback.
Rick
Saturday, June 09, 2001, you wrote:
JS> ----- Original Message -----
JS> From: "Paul Winkler" <slinkp23_AT_yahoo.com>
JS> To: <linux-audio-dev_AT_music.columbia.edu>
JS> Sent: Monday, June 04, 2001 03:21 PM
JS> Subject: Re: [linux-audio-dev] Just a thought about a possible hardware hack
>> Ben Bell wrote:
>> >
>> > On Mon, Jun 04, 2001 at 12:37:56AM -0400, Joe Santapau wrote:
>> > > it was explained to me that the one reason why
>> > > you cannot use two-two channel stereo sound cards
>> > > for multitrack recording was the the crystal on the
>> > > cards that sets the sample rate would not be in total
>> > > sync with each other,
>> > I've actually been wondering about this problem for a while but not
JS> mentioned
>> > it because I haven't trawled the archives to see if it's already been
>> > done and dusted.
>> >
>> > If you're happy to hack your card about a bit, I believe you can just
JS> hack
>> > off the crystal and link up to the other one. My electronics skills are
>> > very basic though and there may be reasons why this would be a bad idea.
>>
>> Well, where is the crystal? Inside some chip on your soundcard
>> somewhere. Which one? Does this chip have pinouts for the timer?
>> If it does, *and* if you can find it, yes, you should be able to
>> do that by scraping off some traces on the PC board and soldering
>> in a jumper.
>>
JS> well your right i haven't had the case off for a while to look at
JS> my sb live, i believe the awe64 was the card i had prior to this one
JS> and it did have a discrete crystal on it, but there is also the possiblilty
JS> that it(the crystal) could be used for something else, i don't know what,
JS> but it could be. so i'd risk a card for nothing.
JS> 16 bit at 48,000 is about as good as an adat, which is good enough in most
JS> cases.
JS> the pc 4 and 8 track cards have better res. and are pretty damn cheap now
JS> too.
JS> which will probably be the route i take.
JS> thanks for the thoughts though guys/gals
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