There are some difficulties with the large buffer approach. You mention using a local clock that is the long term average of the input data rate, again this is some form of adaptive.
If you use a fixed frequency clock you have the problem that you need a fairly large buffer to handle an hours worth or so of music. That takes very creative buffer management when people want to skip songs, change playlists, fast forward etc. With a large enough buffer to handle significant frequency deviations from external to internal clock AND long playtimes before re-synching the lag in user interface could be very objectionable to many people. Its certainly an approach that should be looked into as an option, but it has not been done very often. I tried this several years ago and the buffer management issues became so messy I gave up. And even the companies that have implemented such an approach have still had interface jitter affect the output sound. It seems that even with what should be theoretically completely immune getting the details perfect is not easy. My take as a designer i sI'm not going to aim for perfection. I'm going to do my best to implement a technically robust interface method and do my best to implement it well and let the chips fall where they will. I have never achieved a DAC that is completely immune to outside conditions and I probably never will, so I'm not going to worry about it. The best done DACs sound so good I'm not going ot worry about a $500 cable making it sound slightly different. I would like to design something that is not the case, but I've given up on that as not really necessary for achieving excellent sound. John S. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=70626 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
