Ultrasound based parametric loudspeaker system

Details Ultrasound based parametric loudspeaker system Ultrasound based parametric loudspeaker system

2007-02-20

2007-02-20

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

One-way audio signal program distribution

C181S184000

Reexamination Certificate

active

10118630

ABSTRACT:
A parametric loudspeaker system is described which is based upon the FM-modulation of an ultrasound carrier. Known systems work with AM-modulation. The FM-modulation produces a good matching to the resonant transducer such as the conventionally employed piezo-ceramic transducers. The resonance slope of the transducers is used for FM/AM-conversion. This FM-resonance principle can advantageously be employed in a multi-path loudspeaker system, in which the transducer works in the optimal resonance range in each of the paths. With the conventional AM-modulation this is not possible. The FM-resonance principle can also be used in resonance-free or resonance-poor transducers, such as for example electrostatic transducers.

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