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- S A M P L E D S O U N D S
-
- by Dave Moorman
-
-
- Paul Gomes called me with some
- questions about the Home Tower and
- other things. While we were talking,
- he mentioned having a disk with music
- on it. And singing!
-
- "A clip from Van Halen! With
- exceptional quality," Paul said.
-
- I replied, "Send it to me. This is
- definitely something for LOADSTAR!"
-
- The two files I could use are "The
- Sword and the Serpent", and Van Halen
- performing "Why Can't This Be Love."
- Both are quite large in disk blocks
- (read: Long Load Times). Neither
- returns to LOADSTAR or Basic.
-
- Nevertheless, you will be
- wondering -- Is this Memorex or is
- this LOADSTAR?!
-
- Sound sampling on the C-64 is not
- new. Actually, the technology is not
- all that complicated. (Ahem -- Robin
- Harbron wades in here to note that he
- and others have written articles in
- C=Hacking #20 and #21. Slapping
- nybbles into the volume register is
- not hard. Timing and noise reduction
- is a bear! Then there is Pulse Wideth
- Modulation, which [can] be done, but a
- SuperCPU really, really helps.)
-
- One must have an interface that
- runs the output of the audio source to
- the Analog-to-Digital (paddle)
- register on the SID chip. The bytes
- are recorded to memory. For playback,
- four bits of each byte are quickly
- sent to the Volume register of the
- SID. Out comes the sound.
-
- That's the simple answer. The
- question now is: How did these two
- samples get such good quality? Check
- out Robin's article mentioned above.
-
- The other limitation on the C-64
- is [memory]. Samples take gobs of
- memory. Perhaps the quality in these
- two samples is a result of pushing the
- maximum number of nybbles through the
- Volume register per second. And that
- means Van Halen's clip is only a few
- seconds long.
-
- All in all, this is what keeps me
- using this quaint platform -- there is
- nothing I can NOT do, if I am willing
- to accept (or dodge) the limitations
- of the machine.
-
- DMM
-
- [NOTE]: For the articles by Robin and
- Steve Judd (and others) check out
-
- http://www.ffd2.com/fridge/chacking/
-
- All the gritty details are there!
-
-
-