Parametric signal processing systems and methods
View Patent ↗A signal processing system for generating a parametric signal comprises an audio compressor, operable to compress a dynamic range of an audio input signal, and an equalization network, operable to equalize the audio signal. A low pass filter is operable to remove high portions of the audio signal and a high pass filter is operable to remove low portions of the audio signal. An oscillator circuit is operable to generate a carrier signal, and a modulation circuit is operable to combine the audio signal with the carrier signal to produce at least one modulated carrier signal.
1. A method for generating a modulated carrier signal that can be emitted as a parametric wave, comprising:
compressing a dynamic range of an audio signal to generate a compressed audio signal; equalizing the audio signal to generate an equalized audio signal; band pass filtering the audio signal to generate a filtered audio signal; and modulating a carrier signal with the compressed audio signal to generate a single sideband (“SSB”) modulated carrier signal; the single sideband (“SSB”) modulated carrier signal being of sufficient intensity so as to demodulate when emitted into a non-linear medium; wherein modulating the carrier signal includes utilizing a single oscillator circuit to drive at least a pair of modulators, each of which modulates a carrier signal with a filtered audio signal.
2. The method of claim 1 , further comprising filtering the modulated carrier signal to remove any audio artifacts prior to delivering the modulated carrier signal to an amplifier.
3. The method of claim 1 , wherein compressing the dynamic range of the audio input signal is performed prior to modulation of the carrier signal by a modulation circuit.
4. The method of claim 1 , further comprising providing the modulated carrier signal to an emitter, the emitter being operable to emit the modulated carrier signal into a non-linear medium.
5. The method of claim 4 , further comprising an inductor, associated with the emitter, the inductor being coupled adjacent the emitter.
6. The method of claim 5 , wherein the inductor comprises a fully shielded pot core inductor.
7. A method for generating a parametric sound, comprising:
i) processing at least two audio input signals with at least two signal processing systems, each processing system comprising an audio processor, operable to compress a dynamic range of an audio input signal; an equalization network; a low pass filter, operable to remove high portions of the audio signal; a high pass filter, operable to remove low portions of the audio signal; an oscillator circuit, operable to generate a carrier signal; and a modulation circuit, operable to combine the audio signal with the carrier signal to produce at least one single sideband (“SSB”) modulated carrier signal;
ii) providing the at least one single sideband (“SSB”) modulated carrier signal to an emitter assembly; and
iii) emitting the modulated carrier signal from the emitter assembly into a non-linear medium, the modulated carrier signal being of sufficient intensity to demodulate in the non-linear medium; wherein modulating each audio signal includes utilizing a single oscillator circuit to drive at least a pair of modulators each of which modulates a carrier signal with a filtered audio signal.
8. The method of claim 7 , further comprising an inductor, associated with the emitter, the inductor being coupled adjacent the emitter.
9. The method of claim 8 , wherein the inductor comprises a pot core inductor.
10. The method of claim 7 , wherein the dynamic range of the audio signal is compressed prior to combining the audio signal with the carrier signal.
11. The method of claim 7 , further comprising filtering the modulated carrier signal to remove any audio artifacts prior to delivering the modulated carrier signal to an amplifier.