[sdiy] Data formats in Eprom based drum machines and Romplers

[Microtonal]

Mu law was commonly used in digital telephony.  It gives a dynamic range
closer to 11 or 12 bits than the 8 bits that it uses.  The Sequential Tom
drum machine used Mu law compression/expansion.

John Loffink
microtonal at worldnet.att.net

----- Original Message -----
From: "Peter Blackett" <dragonser at clara.net>
To: "synth Diy list" <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, August 11, 2001 5:10 PM
Subject: [sdiy] Data formats in Eprom based drum machines and Romplers


> Hi,
> I've been investigating the format of data in eproms used in different
> drum machines [ the early 8 bit ones ].I seem to have found from the
> page at
> http://www.electrongate.com/dmxfiles/
> [ good site about the Oberheim drum machines ].
> that there are two main types Mu law and linear .
> I can play back the linear samples ok , but I'm interested if anyone is
> more familiar with the MU law ones ?
> [ I do understand that the Mu law ones are done to increase the
> available dynamic range of the samples ].
> are there any other formats I should be familiar with ?
> I think this would also apply to the samples used in different Romplers
> as well ........
> anyone done any hacking of these [ maybe you should only reply off list
> ! ].
> on another subject entirely ...........
> thanks to the post here about the Theremin event I had a most
> interesting Tuesday evening , was great to see different Theremins being
> used .
> regards Peter
>
>
>