Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

voice intercom using IRDA???

Status
Not open for further replies.

Electricman2K5

New Member
Does anyone know whether it is possible to make a voice intercom for a free space optical channel for about 5m . Can it be done fairlycheaply using iRDA transcievers???? ive seen some which only cost £3 here but ive never heard of it being used for voice/audio transmission can it be done?
 

Attachments

  • irda.gif
    irda.gif
    5.5 KB · Views: 524
Hi Electricman,
What's IRDA? Do you have a link or can you describe what the letters mean?

It is difficult to have loudspeaking, full-duplex two-way communication. Acoustical feedback occurs unless the speakers are turned way down in volume and the mics are not very sensitive. If the mic can hear you, it can also hear the speaker near it.
You speak into your mic, it comes out the speaker at the other end. The mic at the other end hears its nearby speaker sounding your voice and sends it back to you, and around and around the sound goes.

Old intercoms and speakerphones used voice-switching, where your speaker gets cutoff when you speak into your mic. If you keep on talking or if it is noisy at your end, your speaker is cutoff permanently and you won't hear the other end.
Newer intercoms and speakerphones use acousical echo cancellation DSP to try to eliminate feedback. When they get out of whack by the room conditions changing by a door being opened or people moving around, they make cool space-age noises.
 
Hi Electricman,
You found a tiny little IR digital transciever with its leads spaced only 1mm apart. Its range is 3m if there aren't any flourescent lights or high ambient light nearby.
If its range is good enough you could try to use it in your FM sytem. Or else you would need a complicated A to D to A digital system. Maybe a microcontroller can be used to convert audio to a data stream for it and vice-versa.
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top