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Hi,
Anyone knows where to get a ultrasonic transmitter with 40kHz center frequency and bandwidth of 20kHz?![]()
hi,
The 40KHz is OK, but a 20KHz bandwidth.?? what are you trying to do.
Sounders - Ultra Sonic Trasducers
Thanks for the reply,
They can simply change the freq over the time!? I don't know how does modulating is able to case CHANGEs the output freq?
Thanks for the reply,
a modulated freq has a carrier plus and minus the sidebands. maybe they intend to use either constant sidebands too?
You are talking about a system that was developed for muzeums and conference halls where the very high power custom-made ultrasonic transducers blasted a powerful narrow ultrasonic beam that is specially modulated at an object and the interference waves produced demodulated sounds that come "from" the object.What I mean is that the audio signal, being pre-modulated to ultrasound frequency is then transmitted through the ultrasonic transmitter and due to nonlinear air properties, the demodulated audio signal is obtained.