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A bluetooth speaker thin enough to conceal under your shirt, worn about chest-level. In addition to an outward facing speaker, the side that lays against your chest has microphones and other vibration sensors to pick up quietly spoken control commands, or to replay and modify your voice. Paired with
a smartphone app, this rig lets you get a lot of special effects.
It would let you do any kind of voice modification in real time, to sound like any character from Woody Woodpecker to Darth Vader. Sing like anyone you like - or just sing along with whoever's music youre streaming. Or do silly sound effects. Growl like a dog. Act out Poes The Telltale Heart. If thats too high-brow, farts and belches are always popular.
Partly inspired by the Lenovo 700 Bluetooth Speaker, less than 1/2 thick. Reviews say the sound quality isnt very good, but its at least proof you could get speaker thin enough for this idea to work. Just needs the voice pickups and software support.
Check this out
[21 Quest, Oct 01 2022]
No, Check this out instead
[pocmloc, Oct 02 2022]
Thin Actuator Sound Solution
ultra-thin alternative to traditional speakers [a1, Nov 22 2022]
||[pocmloc], Ive seen those voice changer toys, my idea takes it up a notch. And the voice changing was sort of an afterthought even though it turned into a main feature - my original thought was just to be able to play music or other sounds and not have it obvious where they were coming from.
||I'm not sure how small you can make a directional ultrasonic speaker, but (assuming small enough) mount one on the toe of each shoe (more space down there to hide things; no-one will notice slightly bigger shoes) pointing up at your chest. Then, even shirtless (if you're that way inclined) the sound will bounce off as per the idea.