On 8 fev, 12:21, "gethostbyn...@gmail.com" <gethostbyn...@gmail.com
wrote:
---
Yes. I think the right filter would be basically a squelch that
would use an averaging detector for the data and then use the
filtered 425Hz rising above that level to open up a gate and let the
425Hz through. Either that or use the 425Hz signal to turn on a
beeper, momentarily, to let you know that someone was trying to call
you. That might be the better way because it would get rid of the
annoying squelch tails.

Or, maybe, something like this:

http://phonetray.traysoft.com/?gclid=CMDFg_fGnYoCFQgTWAodkTi2nA

If it'll work with your modem.

You can download it for free to find out, anyway.

I'm interested in the filter, so I'll work up something tomorrow and
post it probably on Friday, unless something unexpected comes up.

--
JF

I don't believe, that softwares works! Very very thanks, JF!

Anyway, I am also very interested in others solutions like a filter/
loudspeaker or better, a digital circuit with a LM567. This CI isn't
very expensive.

Very thanks,
Pedro Henrique

The secret of that software is only to add string modem "+PCW=0" or
"+PCW=1", no?

The secret of that software is only to add string modem "+PCW=0" or
"+PCW=1", no?

---
I don't know. Try it.

--
JF

Anyway, I am also very interested in others solutions like a filter/
loudspeaker or better, a digital circuit with a LM567. This CI isn't
very expensive.

The secret of that software is only to add string modem "+PCW=0" or
"+PCW=1", no?

---
I don't know. Try it.

--
JF

I tried and it has worked.

---
Excellent!

So now you don't need the filter?

No matter, I'm intrigued so I'll work something up and post what I
find when I'm done. :-)

--
JF

---
Excellent!

So now you don't need the filter?

No matter, I'm intrigued so I'll work something up and post what I
find when I'm done. :-)

--
JF

Well, I don't need the filter, but I don't have nothing to do and I'm
intrigued too .

I am plus interesed in tone decoder. The problem is that input to
LM567 is at most 200mVrms, so I will need to make a reliable
conversion and protection for the CI.

On 8 Feb 2007 07:21:46 -0800, "gethostbyname@gmail.com"
gethostbyname@gmail.com> wrote:


Anyway, I am also very interested in others solutions like a filter/
loudspeaker or better, a digital circuit with a LM567. This CI isn't
very expensive.

---
"Integrated Circuit" (IC), no?

Good thought.

Since your call-waiting tone is 425Hz, one cycle takes:

1
t = ------- = 0.00235 seconds
425Hz

to complete, and since the tone will be on for 60 milliseconds, the
number of cycles during that time will be:

60ms
n = --------- = 25.53 ~ 25
2.35ms

Looking at the data sheet for the 567:

http://www.datasheetcatalog.com/datasheets_pdf/N/E/5/6/NE567.shtml

on page 5 (407) there are two graphs which show frequency VS
bandwidth and greatest number of cycles needed for output. Since
you have 25 cycles available it looks like if you set your bandwidth
for something between 10 and 14% it might work. I don't know what
effect the data signal is going to have on the 425Hz tone other that
it'll degrade its detection, so the best thing might be to just
wire one up and see what you can do with it.

Well, I don't need the filter, but I don't have nothing to do and I'm
intrigued too .

I am plus interesed in tone decoder. The problem is that input to
LM567 is at most 200mVrms, so I will need to make a reliable
conversion and protection for the CI.

---
That can be as simple as a resistive voltage divider on the input.

Do you have any information regarding the amplitude of the
call-waiting tone relative to the data signal?

--
JF

Well, I don't need the filter, but I don't have nothing to do and I'm
intrigued too .

I am plus interesed in tone decoder. The problem is that input to
LM567 is at most 200mVrms, so I will need to make a reliable
conversion and protection for the CI.

---
That can be as simple as a resistive voltage divider on the input.

Do you have any information regarding the amplitude of the
call-waiting tone relative to the data signal?

--
JF

The calling tone is 80 Vrms (more or less 10 Vrms). So 1,41*90 Vpeak =
127Vpeak. ^^^^^
VRMS

And there is the necessity of capacitors to filter the DC
signal when the phone is not being used (about 48Vdc).
About call-waiting tone signal, It is a acoustic signal. I measured
0,2-0,5Vrms but my multimeter isn't true rms.

John Fields wrote:
On 8 Feb 2007 07:21:46 -0800, "gethostbyn...@gmail.com"
gethostbyn...@gmail.com> wrote:

Anyway, I am also very interested in others solutions like a filter/
loudspeaker or better, a digital circuit with a LM567. This CI isn't
very expensive.

---
"Integrated Circuit" (IC), no?

Good thought.

Since your call-waiting tone is 425Hz, one cycle takes:

1
t = ------- = 0.00235 seconds
425Hz

to complete, and since the tone will be on for 60 milliseconds, the
number of cycles during that time will be:

60ms
n = --------- = 25.53 ~ 25
2.35ms

Looking at the data sheet for the 567:

http://www.datasheetcatalog.com/datasheets_pdf/N/E/5/6/NE567.shtml

on page 5 (407) there are two graphs which show frequency VS
bandwidth and greatest number of cycles needed for output. Since
you have 25 cycles available it looks like if you set your bandwidth
for something between 10 and 14% it might work. I don't know what
effect the data signal is going to have on the 425Hz tone other that
it'll degrade its detection, so the best thing might be to just
wire one up and see what you can do with it.

J F
I followed you mesgs here a little bit.
did a search on google and came up with this one:http://phonetray.traysoft.com/?gclid=CP_fjLvVoooCFQ4HPwodc0GtvA
question: does this work? do you need a special modem to detect the
tone?
rw

--

On 9 Feb 2007 12:59:41 -0800, "gethostbyn...@gmail.com"



gethostbyn...@gmail.com> wrote:

Well, I don't need the filter, but I don't have nothing to do and I'm
intrigued too .

I am plus interesed in tone decoder. The problem is that input to
LM567 is at most 200mVrms, so I will need to make a reliable
conversion and protection for the CI.

---
That can be as simple as a resistive voltage divider on the input.

Do you have any information regarding the amplitude of the
call-waiting tone relative to the data signal?

--
JF

The calling tone is 80 Vrms (more or less 10 Vrms). So 1,41*90 Vpeak =
127Vpeak. ^^^^^

VRMS
---
We call that the "ringing signal".
---

And there is the necessity of capacitors to filter the DC
signal when the phone is not being used (about 48Vdc).
About call-waiting tone signal, It is a acoustic signal. I measured
0,2-0,5Vrms but my multimeter isn't true rms.

---
If it only lasts for 60ms, how did you manage to measure it with a
multimeter?

--
JF

J F
I followed you mesgs here a little bit.
did a search on google and came up with this one:
http://phonetray.traysoft.com/?gclid=CP_fjLvVoooCFQ4HPwodc0GtvA
question: does this work? do you need a special modem to detect the
tone?

On Sat, 10 Feb 2007 02:50:17 +0100 (CET), "Ryan Weihl"

nix...@noname.net> wrote:
J F
I followed you mesgs here a little bit.
did a search on google and came up with this one:
http://phonetray.traysoft.com/?gclid=CP_fjLvVoooCFQ4HPwodc0GtvA
question: does this work? do you need a special modem to detect the
tone?

---
Yes, it works. Read some of the OP's posts to that effect.

You need a modem which supports call-waiting detection. The spec is
provided on the web page, I think.

--
JF

---
Yes, it works. Read some of the OP's posts to that effect.

You need a modem which supports call-waiting detection. The spec is
provided on the web page, I think.

--
JF
JF,

On 10 fev, 14:07, John Fields <jfie...@austininstruments.com> wrote:

On Sat, 10 Feb 2007 02:50:17 +0100 (CET), "Ryan Weihl"

nix...@noname.net> wrote:

J F
I followed you mesgs here a little bit.
did a search on google and came up with this one:
http://phonetray.traysoft.com/?gclid=CP_fjLvVoooCFQ4HPwodc0GtvA
question: does this work? do you need a special modem to detect the
tone?

---
Yes, it works. Read some of the OP's posts to that effect.

You need a modem which supports call-waiting detection. The spec is
provided on the web page, I think.

--
JF


Why is difficult to find those informations?
Google for "+PCW=1 modem v 92" and you will find only few pages.
Why?

Pedro Henrique

if you're talking about the AT Hayse commands, I find them easy.