Method for controlling output from ultrasonic speaker and...

Details Method for controlling output from ultrasonic speaker and... Method for controlling output from ultrasonic speaker and...

2007-04-17

2011-10-18

Mei, Xu (Department: 2614)

Electrical audio signal processing systems and devices

One-way audio signal program distribution

C381S099000

Reexamination Certificate

active

08041049

ABSTRACT:
The invention maintains optimum sound quality even when a listener changes his/her angle formed between a sound wave emitting axis of an ultrasonic transducer and a front direction axis of the listener with respect to the sound wave emitting axis. An ultrasonic speaker system of the invention includes an angle measuring unit that measures a listener angle as an angle formed between a sound wave emitting axis of the ultrasonic transducer and an axis indicating a listener's front direction; a control information transmitting unit that transmits control information including listener angle information obtained by the angle measuring unit; a control information receiving unit that receives the control information; and a control unit that controls the signal processing performed by a signal processing unit based on the listener angle information included in the control information.

REFERENCES:
patent: 5687239 (1997-11-01), Inanaga et al.
patent: 6925296 (2005-08-01), Mattisson
patent: 7016504 (2006-03-01), Shennib
patent: 7123731 (2006-10-01), Cohen et al.
patent: 2000-004500 (2000-01-01), None
patent: 2005-080227 (2005-03-01), None

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