Electronics > Projects, Designs, and Technical Stuff

Directional speakers

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Analog Kid:
Ah, the porch-pirate punisher guy. Farts in a can and all that.

tszaboo:

--- Quote from: Marco on January 13, 2025, 01:31:09 am ---Are you sure this is a directional audio speaker and not a directional ultrasonic speaker? Usually it's the high frequency modulated signal being down-mixed which creates audio.

Wonder if the commercial versions use higher frequency transducers, so they don't have to swing so much from their resonant frequency. You can probably find some data in patents, or maybe the audio engineering society journal.

--- End quote ---
What's actually demodulating the signal? I get the part that ie. a piece of cardboard would do it, but I'm just wondering how does an AM modulated ultrasonic signal turn into demodulated sound.

jrs45:
The air demodulates the signal, surprisingly!

moffy:

--- Quote from: tszaboo on January 14, 2025, 12:07:05 pm ---
--- Quote from: Marco on January 13, 2025, 01:31:09 am ---Are you sure this is a directional audio speaker and not a directional ultrasonic speaker? Usually it's the high frequency modulated signal being down-mixed which creates audio.

Wonder if the commercial versions use higher frequency transducers, so they don't have to swing so much from their resonant frequency. You can probably find some data in patents, or maybe the audio engineering society journal.

--- End quote ---
What's actually demodulating the signal? I get the part that ie. a piece of cardboard would do it, but I'm just wondering how does an AM modulated ultrasonic signal turn into demodulated sound.

--- End quote ---
My brief understanding is that when the air contacts a surface it acts in a non linear fashion to demodulate the signal, have a look at post#5 the video links a paper.

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