| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 46.1 | | KATADN::BOTTOM | | Wed Dec 12 1984 07:29 | 7 |
| This may seem dumb but PCM is defined as:
Modulation of a pulse train in accordance with a code.
I think that there must be something more around here somewhere, I'll get back
to this note if I find anything.
*db* just another maineiac
|
| 46.2 | | KATADN::BOTTOM | | Wed Dec 12 1984 08:22 | 6 |
| I knew I could find more. I have an extract from an engineering guide. I will
send it to anybody who is interested. Please contact me at KATADN::BOTTOM
send your loc/mailstop and I'll send a copy. It should answer all of your
questions.
*db*
*relax have a homebrew*
|
| 46.3 | | PIPA::JANZEN | | Mon Dec 17 1984 08:16 | 5 |
| Pulse code modulaton doesn't mean anytingg in particular, but they probably
mean pulse width modulation. Pulses are sent out at some rate, and the width
of each pulse indiccates the value being represented.
That's the way I would do it if I were putting music on video.
Tom
|
| 46.4 | | KATADN::BOTTOM | | Thu Dec 20 1984 09:39 | 6 |
| There is a book in the TWO (Tueksbury) Library that covers PCM in great detail.
It is: PCM and Digital Transmission Systems. The author is Frank Owen. I now
have this book, but will be returning it before the end of this year. It seems
to be more devoted to analog to digital conversion than the other way but the
basic techniques should hold up in both directions.
*db* merry christmas
|
| 46.5 | | BARNUM::JWALTON | | Fri Dec 28 1984 09:26 | 18 |
| Thanks for the excerpts form the book. It seems that
PCM is what I had thought it was, that is, the method
used in most A/D aplications is pulse amplitude modulation.
I've been familier with this stuff for a while, but was
misslead by the advertising industry!! Imagine:
-> PCM technique far superior to traditional analog
to digital conversions!! <-
So I thought "Well something new, wonder what is is?"
Obviously there isn't.
But the book did help me with some calculations pertaining
to sample rate/bandwidth, seems safe to be above 60KHz for
full 20 to 20.
'blind' John
|