Privacy-preserving energy-efficient speakers for personal sound
First Claim
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1. A computer-implemented process for maintaining privacy while a user is listening to audio, comprising:
- dividing an audio signal representative of sound to be heard by the ear of the user into multiple complementary parts; and
sending one or more parts of the multiple complementary parts of the audio signal to a first channel, while sending one or more other parts of the multiple complementary parts of the audio signal to channels other than the first channel in a manner so that sound generated by the one or more parts of the multiple complementary parts of the audio signal and the one or more other parts of the multiple complementary parts of the audio signal arrive at the ear of the user at substantially the same time,wherein the one or more parts of the multiple complementary parts of the audio signal sent to the first channel are sent to one or more parametric speakers, andwherein the one or more parts of the multiple complementary parts of the audio signal that are sent to the one or more parametric speakers are sent by modulating ultrasonic carrier signals by the one or more parts of the multiple complementary parts of the audio signal added with a low frequency signal with a minimal spectral power above a lowest frequency that a human can hear.
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Abstract
The privacy-preserving energy-efficient speaker implementations described herein improve user privacy while a user is listening to audio and can reduce the energy necessary to output the audio. This can be done by using parametric speakers and/or traditional loud-speakers. Signal splitting and masking can be used to improve user privacy. Additionally, a signal modulation technique which significantly reduces power requirements to output an audio signal, especially in the context of using parametric speakers, can also be employed.
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Citations
20 Claims
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1. A computer-implemented process for maintaining privacy while a user is listening to audio, comprising:
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dividing an audio signal representative of sound to be heard by the ear of the user into multiple complementary parts; and sending one or more parts of the multiple complementary parts of the audio signal to a first channel, while sending one or more other parts of the multiple complementary parts of the audio signal to channels other than the first channel in a manner so that sound generated by the one or more parts of the multiple complementary parts of the audio signal and the one or more other parts of the multiple complementary parts of the audio signal arrive at the ear of the user at substantially the same time, wherein the one or more parts of the multiple complementary parts of the audio signal sent to the first channel are sent to one or more parametric speakers, and wherein the one or more parts of the multiple complementary parts of the audio signal that are sent to the one or more parametric speakers are sent by modulating ultrasonic carrier signals by the one or more parts of the multiple complementary parts of the audio signal added with a low frequency signal with a minimal spectral power above a lowest frequency that a human can hear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer-implemented process for modulating a signal in order to reduce energy consumption of a transducer comprising:
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adding a low frequency signal with an unsubstantial spectral power above a lowest frequency that a human can hear to an audio signal to be transmitted in a manner so as to reduce energy required to output the audio signal, wherein the audio signal is representative of sound to be heard by a user; and modulating carrier signals by the audio signal with the low frequency signal added; and outputting the modulated audio signal with the low frequency signal added by the transducer in order to reduce the energy consumption of the transducer. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system for providing audio to a user while maintaining privacy, comprising:
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a computing device; a computer program comprising program modules executable by the computing device, wherein the computing device is directed by the program modules of the computer program to, divide an audio signal into two complementary parts, a first part and a second part; output the first part of the audio signal using a parametric speaker, comprising; generating ultrasonic carrier signals; adding a low frequency signal with a minimal spectral power above a lowest frequency that a human can hear to the first part of the audio signal; generating modulated signals by modulating the ultrasonic carrier signals by the first part of the audio signal added with the low frequency signal; transmitting the generated modulated signals to transducers of the parametric speaker and causing the transducers to form an ultrasonic beam that has a main lobe directed towards the ear of the user; and output the second part of the audio signal using one or more loudspeakers so that the sound output by the one or more loudspeakers is directed toward the ear of the user. - View Dependent Claims (19, 20)
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Specification