Re: DTMF dead?
- From: Tim Shoppa <shoppa@xxxxxxxxxxxxxxxxx>
- Date: Sat, 07 Jul 2007 04:55:55 -0700
Nico Coesel wrote:
I have an upcoming project in which I might want to use dtmf
transceiver chips as a simple means of communication. However, it
seems that dtmf transceiver chips are quite hard to get these days.
Even Digikey stocks none. Anyone knows a source that keeps making dtmf
transceivers for the years to come?
The DTMF chips were commercially viable for a few years a few decades
ago. They lived on in some hobbyist projects much much longer and I'd
expect the hobbyist surplus houses (BG Micro, Jameco, etc.) to still
have some lying about in the bins. BG Micro seems to have the SSI-204
and 8870 decoders and the 5089 generator.
Most recent phone accessories that do DTMF decoding use custom ASIC's
and aren't easily isolated to just find the DTMF parts (usually a
single chip does not just the decoding but everything else too).
A DSP weenie would certainly tell you to do any DTMF decoding with a
cheap DSP. 565's etc. still are around that's for sure!
Almost all recent radio-control stuff uses OOK with repeating pulse
trains and seem to work pretty well. This is something easily done by
tiny microcontrollers.
Tim.
.
- References:
- DTMF dead?
- From: Nico Coesel
- DTMF dead?
- Prev by Date: Fouad Haddad (Lebanon)
- Next by Date: Re: DRAM data persistence
- Previous by thread: DTMF dead?
- Next by thread: Re: DTMF dead?
- Index(es):
Relevant Pages
|
