DaveWr;509053 Wrote: > SPDIF can transmit a very accurate signal. The 0s and 1s are all > usually quite correct. The problem is that jitter is small changes in > duration of the 0s and 1s. Since the system uses serial data any clock > variation from the source ripples through, although increasingly clever > techniques are used to suppress most of these variations. The design > approach was flawed in the definition of the interface, and not choosing > a master clock to DAC and the source (disc drive or whatever). > > TCP/IP is a mechanism where data is put into packages, with error > detection, source and destination addresses, sequence numbers etc. This > type of transmission uses data that is buffered, to build up the > packages before sending, to receive packages then check on errors. In > the SB3 / Boom there is several seconds of buffered audio data. In the > good old days this type of buffer would be prohibitively expensive. CDs > needed low cost players. The key issue overall is that the DAC can have > a very low jitter clocking system, the audio data is requested in big > packets when required, and locally converted to the serial data the DAC > requires. Significantly greater accuracy in the timing of the 0s and > 1s, but requires LAN technology, buffer handling, protocol processing > etc. cheap today, unacceptable in 1982 (First CD CDP101 from Sony). > > The final point about diagram 3 - is that DACs don't work like this > (because there is no real standard existing, and the SPDIF interface > already exist in large numbers). But really a TCP/IP DAC is what > Squeezeboxes / Linn DS players are all about. > > Dave
Hi, Dave. Am I correct in assuming that TCP/IP is far superior to S/PDIF when it comes to transmitting digital audio signals? If so, I wonder why more "audiophile" companies aren't designing their DAC's to work with TCP/IP connections instead of S/PDIF ones? It can't be cost as TCP/IP is standard in the extraordinarily large computer field. Heck, Slim Devices was able to design the DAC's in their Squeezeboxes to connect properly to TCP/IP at not much cost. Thanks -- Kellen ------------------------------------------------------------------------ Kellen's Profile: http://forums.slimdevices.com/member.php?userid=16569 View this thread: http://forums.slimdevices.com/showthread.php?t=74341 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/discuss
