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Old 30th May 2005, 11:10 PM   #1
Elkaid is offline Elkaid  Canada
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Smile Playing music through the phone

Hi,

I need to build a device for my uncle (musician) that allows him to play music (from cd player, tapes etc.) through the phone so his customers can have a quick idea about the work being made.

I know emails or internet would be easier but he can't use it.

Anyone with ideas ? schematics ?

Thank you very much.
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Old 31st May 2005, 01:56 AM   #2
soongsc is offline soongsc  Taiwan
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No computers? Just interfacing the device to the phone lines? It might be possible using a computer with a modem.
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Old 31st May 2005, 01:43 PM   #3
Elkaid is offline Elkaid  Canada
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I think I expressed myself incorrectly

I simply want to use a cd player's output and connect it in parallel to the telephone's microphone so the listener can hear the music through his phone.

Could it be easy as that ?

Thank you
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Old 31st May 2005, 02:00 PM   #4
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I don't know what it's like over there, but in the UK it's illegal to connect an unapproved device to the phone line.
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Old 31st May 2005, 02:01 PM   #5
soongsc is offline soongsc  Taiwan
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If you like DIY, this site might be usefull.
http://www.tkk.fi/Misc/Electronics/c...interface.html

Otherwise, there are also other commercial devices that give you line inputs to the phone line.
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Old 31st May 2005, 04:06 PM   #6
macboy is offline macboy  Canada
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Keep in mind the inherent limitations of the phone system, namely the bandwidth, which goes from about 300 Hz to 3500 Hz (the sampling rate is 8 kHz).
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Old 31st May 2005, 04:50 PM   #7
soongsc is offline soongsc  Taiwan
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It also has DC on it along with ring high voltages. That's why you need the proper decoupling.
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Old 31st May 2005, 06:14 PM   #8
Elkaid is offline Elkaid  Canada
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Thank you,

Quote:
Keep in mind the inherent limitations of the phone system, namely the bandwidth, which goes from about 300 Hz to 3500 Hz (the sampling rate is 8 kHz).
Thanks. In my case, quality isn't an issue. The goal is to give the customer a "preview" of the project progress so he can give his impressions in real-time.

Quote:
I don't know what it's like over there, but in the UK it's illegal to connect an unapproved device to the phone line.
Uhhhh... I'm not sure here in Canada but I suppose it's "legal". Maybe that could explain why phone companies are selling "line" insurances in case something blow up between your phone and the telco.
As some says : you're allowed to do anything as long as you don't get caught. Anyway, your point deserves investigation. Thank you.
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Old 31st May 2005, 06:50 PM   #9
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What you are looking for is a telephone audio coupler.

Here's one. Google for others.

http://www.testequipmentdepot.com/sk...upler/t21p.htm

Check with them to make sure it's usable in Canada.
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Old 31st May 2005, 07:43 PM   #10
Elkaid is offline Elkaid  Canada
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Thanks !

I found the following schematic and it would be nice if you could give me your comments about it.

http://home.maine.rr.com/randylinscott/jul98.htm

If I want to be able to speak at the same time as the music plays, can I simply remove R1 ?

Thank you
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