System and method for generating spatial sound using ultrasound
AssigneePixie Dust Technologies, Inc.
InventorsYoichi OCHIAI, Takayuki HOSHI
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Abstract
A novel system and method for spatial sound generation is disclosed. A system and method for generating bodiless mid-air speakers includes the steps of: generating a modulated signal by modulating an ultrasonic carrier signal with an audio signal, determining a phase delay value for each ultrasonic transducer of an array of ultrasonic transducers with respect to one or more focal points, and driving each such ultrasonic transducer with the modulated signal in accordance with the phase delay value determined for each ultrasonic transducer to generate audible sound at the one or more focal points.
Claims20
A method for generating bodiless mid-air speakers comprising the steps of:
- generating a modulated signal by modulating an ultrasonic carrier signal with an audio signal;
- determining a phase delay value for each ultrasonic transducer of an array of ultrasonic transducers with respect to one or more focal points;
- and
- driving each such ultrasonic transducer with the modulated signal in accordance with the phase delay value determined for each ultrasonic transducer to generate audible sound at the one or more focal points.
A bodiless mid-air speakers generator, comprising:
- one or more ultrasonic phased arrays, each ultrasonic phase array comprising:
- an array of ultrasonic transducers;
- a signal generator that generates a modulated signal by modulating an ultrasonic carrier signal with an audio signal;
- a phase delay calculator that determines a phase delay value for each ultrasonic transducer of the array of ultrasonic transducers with respect to one or more focal points;
- and
- a driving circuit for applying the modulated signal to each ultrasonic transducer in accordance with the phase delay value determined for each such ultrasonic transducer to generate audible sound at the one or more focal points.
A method for generating bodiless mid-air speakers comprising the steps of:
- generating a first modulated signal by modulating an ultrasonic carrier signal with a first audio signal;
- generating a second modulated signal by modulating an ultrasonic carrier signal with a second audio signal;
- determining a phase delay value for each ultrasonic transducer of a first group of transducers of an array of ultrasonic transducers with respect to a first focal point;
- determining a phase delay value for each ultrasonic transducer of a second group of transducers of the array of ultrasonic transducers with respect to a second focal point;
- driving each such ultrasonic transducer of the first group of transducers with the first modulated signal in accordance with the phase delay value determined for each such ultrasonic transducer of the first group to generate audible sound at the first focal point;
- and
- driving each such ultrasonic transducer of the second group of transducers with the second modulated signal in accordance with the phase delay value determined for each such ultrasonic transducer of the second group to generate audible sound at the second focal point.
Dependencies are inferred from the claim text.