Well I don't think it's at all that cut and dried. Here is an interesting quote:
Quote:
M - Delta Modulation. During coding only 1 bit differences between consecutive amplitudes are generated at a high conversion speed indicating whether the signal was increased or decreased (from the previous sample). Demand on the storage device and the speed of transmission channel is very high in comparison to the PCM system for the same quality of signal (Nakajima, et al., 1983).


http://www.digital-recordings.com/publ/pubrec.html

There are lots of great articles on this site BTW.

EDIT:

Keep in mind, Sony and Sony Marketing have a lot of reasons to boost this technology, not all based on merit. Memory Stick, Beta, and other Sony technologies are examples of Sony's very strong NIH attitude. Sometimes they are better, sometimes just different to be different.

[This message has been edited by charlie (edited October 30, 2002).]
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Charlie