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leilarazavi2000
Joined: 01 Dec 2002
Posts: 59
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 02 Dec 2006 8:14 How can I detect busy Line Phone with MCU ? |
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Hi all
How can I detect busy Line Phone with MCU ?
thanks
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budhy
Joined: 21 Oct 2006
Posts: 836
Helped: 185
Location: Indonesia
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02 Dec 2006 9:10 Re: How can I detect busy Line Phone with MCU ? |
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The Line Busy Tone indicates that the called customer's line has been reached but that it is busy or being rung or on permanent signal. When a line busy signal is applied by an operator, it is sometimes calls a busy-back tone.
Line Busy Tone is Low Tone on and off every .5 seconds.
(Low Tone is 480 Hz and 620 Hz at -24 dBm0/frequency.)
To detect Line Busy Tone with MCU, you have to filtered the tone and than detect on and off signal every .5 seconds
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alec82
Joined: 25 Oct 2006
Posts: 215
Helped: 65
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02 Dec 2006 9:13 Re: How can I detect busy Line Phone with MCU ? |
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hi
u can test lin voltage with adc of micro.if line is busy the voltage droped to 6 v.
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budhy
Joined: 21 Oct 2006
Posts: 836
Helped: 185
Location: Indonesia
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02 Dec 2006 9:50 Re: How can I detect busy Line Phone with MCU ? |
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| Quote: |
| if line is busy the voltage droped to 6 v. |
It is line in use indicator, not phone busy indicator
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leilarazavi2000
Joined: 01 Dec 2002
Posts: 59
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03 Dec 2006 20:01 Re: How can I detect busy Line Phone with MCU ? |
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[quote="budhy"]
Line Busy Tone is Low Tone on and off every .5 seconds.
(Low Tone is 480 Hz and 620 Hz at -24 dBm0/frequency.)
To detect Line Busy Tone with MCU, you have to filtered the tone and than detect on and off signal every .5 seconds[/quote]
Can you help me to design this circuit ?
Very Thanks
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manish12
Joined: 21 Nov 2006
Posts: 1020
Helped: 31
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03 Dec 2006 20:41 Re: How can I detect busy Line Phone with MCU ? |
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if you know the , what kind of signal you have than what is your problem ?
plz more specific.
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VSMVDD
Joined: 12 Jun 2005
Posts: 558
Helped: 55
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04 Dec 2006 0:37 Re: How can I detect busy Line Phone with MCU ? |
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if anyone here actualy knew what there on about it would help
all signals busy line, connected, message reached
send a 9600baud blip of data as a paket of several bytes
containing these codes
each country / region system uses its own protocal
so hunt this info instead
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Google
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04 Dec 2006 0:37 Ads |
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aldevan
Joined: 02 Aug 2005
Posts: 147
Helped: 12
Location: São Paulo - Brazil
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04 Dec 2006 7:46 Re: How can I detect busy Line Phone with MCU ? |
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| you can use a NE567 look in google you can found a lot of circuit
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