Telphone

[satchid]

Dear all,

Please bear with me, I have it difficult to explain what I am looking for.

I want to record a piece of music via the telephone line, but when an A (la) is played, then the answering machine hears this as an end of call and switches off.

To solve this I want to know the following:
How can i detect on a telephone line that the calling party putted down the hook, and then automatically do the same on the near side. (similar to an answer machine).
I can not use the end call (blocks of 440Hz separated by blanks) signaling of the telephone line because then it switches the line of when someone plays an A on an instrument.
Could I do this this way: let a picaxe detect the tone (blocks of 440Hz separated by blanks) and form an other slow square wave as a result of the blocks of 440Hz. With other words) when the 440Hz is on the signal is high and low when there is a silence. Then count a few of the blocks, and then switch the line off.
How would I proceed with the code? I have little experience with microprocessors.



If someone has a better idea to solve tis problem, I would appreciate the info.

Willy

PS: A picaxe is an easy to program microprocessors.

 

[J0HN1]

the simplest detection that comes to mind is an absence of signal.

If nothing is present for a short period, maybe 20 seconds ?
then the machine could be set to hang up.

Using tones and notes would be troublesome,
as they could appear in music.

A telephone is not a good medium for music,
as you probably know.

Best of luck with it, John