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Spontaneous echo effect? Answered


I was thinking of the old teddy bears which let kids talk to them and a chip recorded the sound and talked back. That made me think how creepy it would be to people walking through a Halloween haunt if they suddenly heard their own words repeated behind them. A quick search led me to this site:

http://www.electronics123.com/s.nl/it.A/id.499/.f?category=2

It seems pretty inexpensive, but you need to hold down a button to record and push another to playback.

Any electronic geniuses who could create an ambiance prop that records and plays back ever 10-20 seconds or so? Hopefully one that does not involve elaborate reprogramming.

Maybe there is an off the shelf option I am not aware of. That would be welcome too.

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KitemanBest Answer (author)2011-01-26

Wire in pressure-pads instead of switches - you then record what they say whilst stood in one area, and then the next display feeds back their own words.

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justjimAZ (author)Kiteman2011-01-26

That's not a bad idea kiteman. I would like it in the same area though. I worry about people standing on both the record and playback switches at the same time.

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kelseymh (author)justjimAZ2011-01-26

Use two pressure pads, separated by more than a human stride-length. McMaster-Carr sells a bunch of different kinds. They also have switch mats.

The latter are quite pricely for a one-off; we bought one for my grandfather's home, to notify his caregivers (through a doorbell) when he got up from his chair, and it was reliable for more than five years.

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Kiteman (author)justjimAZ2011-01-26
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NachoMahma (author)2011-01-26

.  I'd look into audio delays. Something with a 10-20 sec loop should do what you describe (and no trigger switch is needed - turn it on and let it run).

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orksecurity (author)NachoMahma2011-01-27

You may also need some full-duplex hardware, to make sure it doesn't hear itself and build up feedback.

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