Method and system for generation of sound fields
A sound field and ultrasonic technology, applied in the field of sound field generation, can solve problems such as immaturity and difficulty in focusing ability
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[0051] Reference is made together to FIGS. 1A and 1B which schematically illustrate the known principle of demodulation of an ultrasound beam through a nonlinear medium. Sending high frequency sound / sound waves (ultrasound) with a high sound pressure level (SPL) causes air molecules to behave in a non-linear fashion - the higher the amplitude, the faster the molecules move. Thus, an input (ultrasonic) sine wave signal S with a sufficiently high SPL propagating through a nonlinear medium, as illustrated for example in FIG. 1A 0 Harmonics are generated in a predictive manner and typically obtain a sawtooth S m shape. at the corresponding frequency f 1 and frequency f 2 With two ultrasonic waves being sent, the nonlinear behavior of the air will demodulate the signal and produce the following output and harmonics:
[0052] (1) Natural frequency f 1 and f 2 ;
[0053] (2) Harmonic nXf 1 and mXf 2 (n and m are integers);
[0054] (3) sum of frequency f 1 +f 2 ;as well a...
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