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PICList Thread
'DTMF code'
1997\03\13@192647 by John Doe

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I anyone has some code to produce DTMF tones.....thats about as simple
as you can get thats well documented i'd appreciate it. David Thomas's
code is real good and he has been helping me but all the extra keypad
stuff seems to be confusing me. I just want a program that lets me put
in the values of the tones I want.

I anyone has this in the Parallax instruction set i'd appreciate it.
I'm going to use this as a memory tone dialer, just a few phone numbers
programmed into it, so I don't need anything fancy.

If it was written for a clock speed besides a colorburst crystal....i'd
appreciate some info on doing the math. I don't know too much about PICs
either, I had been programming the 68HC811 for a while and it seems like
I have to learn about the PIC's again.

Thanks

spam_OUTdeicideTakeThisOuTspamfia.net


'DTMF Code'
1997\05\24@054953 by Mike Ghormley
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I seem to post this about every four months:

Try:
       ftp://ftp.parallaxinc.com/pub/picsrc/dtmf.asm

Michael

When the way of the Tao is forgotten, kindness and ethics must be taught.
Men must learn to pretend to be wise and good.  --  Lao Tzu

1997\05\24@132843 by John Payson

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> I seem to post this about every four months:
>
> Try:
>         ftp://ftp.parallaxinc.com/pub/picsrc/dtmf.asm

As far as I can tell, the code at that URL only *generates* DTMF.  I think
the question was whether it was possible to *receive* DTMF (a much harder
problem).  Another poster offered a program awhile back that could detect
long bursts of DTMF but it couldn't look for all seven tones at once and
consequently couldn't detect short DTMF tones.  The algorithm I've
produced does a real-time simultaneous detect on eight tones and every
1/60 second it produces a new "guess" as to what it heard.

1997\05\26@100742 by Jose Antonio Noda

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At 01:56 24/05/97 -0700, you wrote:
>I seem to post this about every four months:
>
>Try:
>        ftp://ftp.parallaxinc.com/pub/picsrc/dtmf.asm
>
>Michael
>
>When the way of the Tao is forgotten, kindness and ethics must be taught.
>Men must learn to pretend to be wise and good.  --  Lao Tzu
>

Hi,

I'm learning with pics, and I'm interested in this source code,
but I don't know how it could be the conection with the phone.
could you send me how could I connect this to a phone or a speaker?.
A jpg, gif, or bmp could help me to understand more about these chips.

Regards,
Jose Antonio Noda


'DTMF code'
1997\08\07@173433 by Jose Antonio Noda
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Hi,

I'm looking for information about DTMF decoders,
please could anyone tell me where can I find information about DTMF decoders,
or if anyone have a DTMF source code could send me the source code?
Please, help me and tell me where can I find information about this!!!!!!.

Jose Antonio

1997\08\07@233245 by Jeff King

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At 05:33 AM 8/7/97 +0200, Jose Antonio Noda wrote:
>Hi,
>
>I'm looking for information about DTMF decoders,
>please could anyone tell me where can I find information about DTMF decoders,
>or if anyone have a DTMF source code could send me the source code?
>Please, help me and tell me where can I find information about this!!!!!!.
>
>Jose Antonio
>
>

Haven't used this myself but take a look here:

http://www.picpoint.com/progetti/dtmf_jh/dtmf_jh.htm

Good luck.


Regards,

------------------------------------
| Jeff King      Aero Data Systems |
| .....jeffKILLspamspam@spam@mich.com  P.O. Box 510895   |
| (810)471-1787  Livonia, MI 48151 |
|F(810)471-0279  United States     |
------------------------------------

1997\08\08@015506 by Dale Severns

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>Hi,
>
>I'm looking for information about DTMF decoders,
>please could anyone tell me where can I find information about DTMF decoders,
>or if anyone have a DTMF source code could send me the source code?
>Please, help me and tell me where can I find information about this!!!!!!.
>
>Jose Antonio
>
>

Hello Jose,

I have been searching the net for bit banging sources, and found
a DTMF dialer using PIC code at web address http://www.brouhaha.com/%7Eeric/pic/

This is Eric Smith's web page and therin you will find the DTMF dialer
stuff


     Dale Severns

1997\08\08@125128 by sdattalo

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Jose Antonio Noda wrote:
> I'm looking for information about DTMF decoders,
> please could anyone tell me where can I find information about DTMF decoders,
> or if anyone have a DTMF source code could send me the source code?
> Please, help me and tell me where can I find information about this!!!!!!.
>
> Jose Antonio

Hi Jose,

I've got some DTMF decoding code, but I can't give it to you. Sorry.
However, here's the theory upon which the decoding algorithm is
based:

http://www.interstice.com/~sdattalo/technical/theory/dtmf.html

From this it should be really trivial to write your own decoder. :)

Scott

Hey! Your on the wrong
side of the road, Mike!
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