Disklavier

[Excerpt of personal correspondence with Terry regarding the sync
problems with his modified DCD-1:]


On Fri, 5 Jan 2007, Terry Fein wrote:

> I suspect that this is a question for the Yamaha engineers.  I have a
> DCD1 that I use with a GranTouch.  I had the DCD1 modified to add a
> digital output, which is connected to my stereo system.

> First, each track starts and stops twice after a few seconds, and then
> on the third try, plays all the way through the song.

This may be related to the DCD-1 pre-reading the start of each track to
read enough MIDI data to determine the title of the song and whether it
is a CD track to be used with the PianoSmart feature.  The audio output
would normally be masked by the DSP during this pre-reading, but you are
hearing it because you are probably tapped in earlier in the pipeline.

I suspect the sync problem you have is related to your modification
grabbing the signal ahead of the final stage of processing - the
demodulation of the MIDI data channel.

You may be able to solve both problems by grabbing the digital output
further downstream (past the DSP) as it hits the DAC for the analog
output.


Mark