mark@apple.UUCP (Mark Lentczner) (11/02/87)
In reference to the current disscussion about Sound Resouces on the Mac II
someone said something about haveing sounds sampled at a different rate
and wanting a program to re-sample them to the right sample rate for the
Mac II.
You DO NOT NEED to do this!!! It only doubles or quadruples the number of
samples in the file. The SoundManager in the Mac II will happily re-sample
the sound at play time! All you have to do is look in the header of the
snd resource (either type 1 or type 2) and change the sample rate constant.
The Sample rate constant tells the Sound Manger what sample rate the sound
was sampled at. It is a 32 bit fixed-point number (binary point in the
middle). For various sample rates the proper values are:
44,100.00hz (CD Rate) AC44 0000
22,254.54hz (Mac Rate) 56EE 8BA2
11,127.27hz (Half Mac) 2B77 45D1
5,563.63hz (Quarter) 15BB A2E9
In any of the system beeps you should find the value for mac or half mac
I don't remember what offset the value is stored at, poke in the system
ones to see.
-Mark Lentczner
ATG Graphics & Sound Group
Apple Computer, Inc.
20525 Bandley Drive, MS:22Y
Cupertino, CA 95014
mark@apple.CSNET
{dual,ios,voder,nsc}!apple!mark.UUCP
--
-Mark Lentczner
ATG Graphics & Sound Group
Apple Computer, Inc.
20525 Bandley Drive, MS:22Y
Cupertino, CA 95014
mark@apple.CSNET
{dual,ios,voder,nsc}!apple!mark.UUCP