Re: [ARSCLIST] Memorex CDs

[Mike Richter <mrichter@xxxxxxx>]

steven c wrote:

> We can assume that "digital" will clue the party that the pits and
> absences represent ones and zeros. The next problem (see above) is
> trying to figure out how the sequence (which wouldn't produce
> anything like a sound signal if read directly) relates to the
> sequence of digital values that represent a stepwise representation
> of a sound waveform.

The problem appears to me to reduce to solvable and indeterminate parts 
- as follows.

1. Trace the spiral of the CD to get the sequence of recorded bits - not 
at all difficult given reasonable tools.

2. Guess that the disc represents audio and use persistence of tone to 
decrypt the encoding algorithm for the byte information. Not trivial, 
but not especially hard.

3. The process of 2. will lead to the breakdown of samples to bytes. 
That one is trivial.

4. Determine sample rate - a classic impossibility from the audio disc 
alone.

Mike
--
mrichter@xxxxxxx
http://www.mrichter.com/