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'[EE]: DTMF Decoding'
2002\03\20@091221 by Shawn Yates

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Hello all.

I have a project where I need to get DTMF decoded and into a PC.  I have
looked at it from the route of using VB and a modem to decode it, but this
seems very costly and complex.

Can I decode DTMF easily using a PIC or something then use the PIC to send
data to the PC via USART?  I already have a PIC connected to the PC sending
other things to it, the real question is what do I do to anser a phone when
it rings and then decode DTMF that someone keys in?  Oh, the ability to beep
at the user would be nice also so I can prompt them.

TIA

Shawn

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2002\03\20@093011 by Randy Glenn

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I don't know if this will help:

http://www.dattalo.com/technical/theory/dtmf.html

If you're doing some sort of telephony project, why not use a voice modem
with TAPI? (No firmware debugging that way) Some VB code for TAPI can be
found here:

http://www.geocities.com/sfrare/vbtapi-c.htm

Good luck,

-Randy Glenn

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{Original Message removed}

2002\03\20@093610 by Scott Dattalo

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On Wed, 20 Mar 2002, Shawn Yates wrote:

> Hello all.
>
> I have a project where I need to get DTMF decoded and into a PC.  I have
> looked at it from the route of using VB and a modem to decode it, but this
> seems very costly and complex.
>
> Can I decode DTMF easily using a PIC or something then use the PIC to send
> data to the PC via USART?  I already have a PIC connected to the PC sending
> other things to it, the real question is what do I do to anser a phone when
> it rings and then decode DTMF that someone keys in?  Oh, the ability to beep
> at the user would be nice also so I can prompt them.

Shawn,

If you form a sentence that contains "DTMF" and "easy" then I really doubt
you had this in mind as a solution:

http://www.dattalo.com/technical/theory/dtmf.html

An easy solution is to by a DTMF decoder IC.

Scott

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2002\03\20@094909 by Milan Pavlica YU7AEC

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part 0 44 bytes
his is a multi-part message in MIME format.
part 1 887 bytes content-type:text/plain; charset=koi8-r (decoded 7bit)

Get MITEL MT8870 and will solve your problems :)

Shawn Yates wrote:

{Quote hidden}


part 2 201 bytes content-type:text/x-vcard; charset=koi8-r;
(decoded 7bit)

begin:vcard
n:Pavlica;Milan
x-mozilla-html:FALSE
org:SuperSonic Systems
adr:;;;;;;
version:2.1
email;internet:mpavlicaspamKILLspamptt.yu
title:Chief
fn:Milan Pavlica
end:vcard


part 3 131 bytes
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2002\03\20@122310 by PDRUNEN

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I have a schematic using the M8870 DTMF decoder and a PC decoding program at
http://members.aol.com/~pdrunen/

Paul

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2002\03\20@130543 by PY2NI

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   Yes, get M8870, it's not hard to find and works great.

Regards
Horta


> Get MITEL MT8870 and will solve your problems :)
>
> Shawn Yates wrote:
>
> > Hello all.
> >
> > I have a project where I need to get DTMF decoded and into a PC.  I have
> > looked at it from the route of using VB and a modem to decode it, but
this
> > seems very costly and complex.
> >
> > Can I decode DTMF easily using a PIC or something then use the PIC to
send
> > data to the PC via USART?  I already have a PIC connected to the PC
sending
> > other things to it, the real question is what do I do to anser a phone
when
> > it rings and then decode DTMF that someone keys in?  Oh, the ability to
beep
{Quote hidden}

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2002\03\20@131046 by zantos

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Try
http://www4.tpg.com.au/users/talking/DialAlarm-1-Page1.html

HTH

----- Original Message -----
From: "Shawn Yates" <.....syatesKILLspamspam.....CARETECH.COM>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: 20 March 2002 14:11
Subject: [EE]: DTMF Decoding


> Hello all.
>
> I have a project where I need to get DTMF decoded and into a PC.  I have
> looked at it from the route of using VB and a modem to decode it, but this
> seems very costly and complex.
>
> Can I decode DTMF easily using a PIC or something then use the PIC to send
> data to the PC via USART?  I already have a PIC connected to the PC
sending
> other things to it, the real question is what do I do to anser a phone
when
> it rings and then decode DTMF that someone keys in?  Oh, the ability to
beep
{Quote hidden}

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2002\03\23@022103 by Brandon Irwin

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I don't have time to read all the replies, but most DTMF decoders have the
data available in parallel... You could easily interface to the parallel
port if you could somehow access the physical memory address of the port.
Qbasic can do this easily. I know that there are some OCX's available to do
this in VB also. The only way i can think of doing this, right now, this
would require polling. Poll and mask out the tone detected bit. I say use a
PIC though. Good experience points.

Brandon Irwin

At 06:11 AM 3-20-2002, Shawn Yates wrote:
{Quote hidden}

                       This message written using the Dvorak keyboard layout.

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2002\03\25@044644 by zantos

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Have you though about using the Holtek DTMF decoder HT9170 and interface to
a PIC ...very simple solution. I have used this approach with great
results..
http://www.holtek.com/docum/comm/9170.htm
HTH

{Original Message removed}

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