Disklavier

You've got it right.  
One side is conventional audio data.  The other side is MIDI data that has been converted to an audio format.  During playback, the control box sends the track with audio data on to the amp or audio out, if it's a DSR1.  The remaining track (the audio MIDI) is sent to a DSP card to convert the data to a conventional MIDI data-stream which is then sent to the Disklavier drive unit to move the keys. 
To convert the MIDI data to audio MIDI data requires a special device.  One company that makes this device is the MIDI-MAN company.  The device is called the "MIDI tape recorder interface".
The tricky part is going to be timing the converted audio MIDI to play along with a CD audio track.

  
>>> simpsond@... 10/08/01 10:38AM >>>
Maybe they are using one channel (L/R?) which is an digitized analog signal that
contains the MIDI information.

In other words, it needs to be 'demodulated' kinda like a modem. Then the
digital information at that particular channel has the MIDI information. The
other channel has the digitized audio which is multiplexed with (L/R)
information that will be heard in the left and right speakers. This would
explain why someone mentioned the other day that they heard a buzzing signal
coming out of one speaker when played over a normal CD player. All this could
then be demodulated (MIDI) and de-multiplexed (audio) from the CD within the
electronics in the piano.

That type of CD could be easily copied with any 'working' CD copy software.

However, this type of CD would require a specialized electronic design to create
it...


Danny


From: "vincentdeleur" <vincent.de.leur@yamaha.nl>
To: <disklavier@yahoogroups.com>
Sent: Monday, October 08, 2001 1:06 PM
Subject: RE: [disklavier] How do you make a PianoSoft Plus Audio CD?


> Carol Beigel is still misunderstanding the question I suppose, it is not
> about copying a soft plua audio CD, for that is no problem, just copy in the
> PC with any CD burn programm.
> All this matters are concerning how to create own, new CD's suitable for the
> Mark III, with audio and midi on it mixed.
> Still also I do not know as an Yamaha employee in Holland, specialized in
> the disklavier, how they do it at Yamaha's, but I will find out.
>
> Vincent de Leur
> Yamaha Music Netherlands
> Acoustic Division




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Mark Wisner
Piano Service
Yamaha Corporation
mwisner@...