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In Reply to: Re: Considering Squeezebox -- Please help posted by BFitz on September 7, 2005 at 14:19:38:
Audio devices almost always use isochronous data transfers, which means the source is the master and it controls the transfer rate. There are a few different isochronous modes that the device can use to synchronize to that rate since there is no clock provided, and no handshaking is used, but it does have to sync and generate PLL controlled clocks for the D/A system. Do you know of an audio USB DAC that has a crystal controlling the D/A conversion? I don't think you'll find one since as far as I know they all rely on isochronous transfers from the host, don't they?There's also not really any error checking in isochronous transfers since the data is coming at a fixed rate and there's no opportunity to retransmit.
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Follow Ups
- I don't think any USB audio devices have a master clock - Monkey Bones 09/7/0517:46:36 09/7/05 (10)
- Re: I don't think any USB audio devices have a master clock - BFitz 19:53:29 09/7/05 (7)
- Re: I don't think any USB audio devices have a master clock - Monkey Bones 20:35:46 09/7/05 (6)
- Re: I don't think any USB audio devices have a master clock - BFitz 22:17:30 09/7/05 (5)
- Re: I don't think any USB audio devices have a master clock - John Swenson 23:54:14 09/7/05 (4)
- Re: I don't think any USB audio devices have a master clock - BFitz 09:10:31 09/8/05 (3)
- Re: I don't think any USB audio devices have a master clock - John Swenson 16:56:08 09/8/05 (0)
- Two stage PLL - Monkey Bones 09:45:09 09/8/05 (1)
- Re: Two stage PLL - BFitz 14:12:21 09/8/05 (0)
- Re: I don't think any USB audio devices have a master clock - BillC2 19:24:14 09/7/05 (1)
- OK, but that's not part of USB - Monkey Bones 20:39:40 09/7/05 (0)
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