[Tony[_11_]]

On Thu, 08 Oct 2009 10:16:35 GMT, (Don Pearce) wrote:

On Thu, 8 Oct 2009 17:40:55 +0800, "New_idea"
wrote:

Just wondering...
If the music producer can record music as PWM (pulse width modulation)
signal direct
onto CD.
Than a "class-D" CD player doesn't need a Digital-Analog converter.
The PWM signal can be feed direct to a class D power amplifier.
This can save a lot of "signal conversion'"



One word. Jitter.

d

And even worse - a practical class D amp doesn't produce a straight PWM signal - it has to
account for supply variations. And there has to be a way to introduce a volume and maybe
tone controls - all impossible if the signal starts out as PWM

Tony