Superdirectional Acoustic System and Projector
First Claim
1. A superdirectional acoustic system for reproducing a sound signal supplied from a real sound source by using a superdirectional speaker and producing a virtual sound source in a vicinity of a sound wave reflection surface, the system comprising:
- an ultrasonic speaker, which includes an ultrasonic transducer for oscillating a sound wave in an ultrasonic frequency band, for reproducing an audio signal in a relatively medium to high frequency sound range, which is included in the sound signal supplied from the real sound source; and
a low frequency sound reproducing speaker for reproducing an audio signal in a relatively low frequency sound range, which is included in the sound signal supplied from the real sound source.
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Accused Products
Abstract
A superdirectional acoustic system for reproducing a sound signal supplied from a real sound source by using a superdirectional speaker and producing a virtual sound source in a vicinity of a sound wave reflection surface. The system includes an ultrasonic speaker, which includes an ultrasonic transducer for oscillating a sound wave in an ultrasonic frequency band, for reproducing an audio signal in a relatively medium to high frequency sound range, which is included in the sound signal supplied from the real sound source; and a low frequency sound reproducing speaker for reproducing an audio signal in a relatively low frequency sound range, which is included in the sound signal supplied from the real sound source. Sound in the medium-high frequency range is reproduced in a manner such that the sound is produced from a virtual sound source which is formed in the vicinity of the sound signal reflection surface such as a screen.
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Citations
10 Claims
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1. A superdirectional acoustic system for reproducing a sound signal supplied from a real sound source by using a superdirectional speaker and producing a virtual sound source in a vicinity of a sound wave reflection surface, the system comprising:
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an ultrasonic speaker, which includes an ultrasonic transducer for oscillating a sound wave in an ultrasonic frequency band, for reproducing an audio signal in a relatively medium to high frequency sound range, which is included in the sound signal supplied from the real sound source; and
a low frequency sound reproducing speaker for reproducing an audio signal in a relatively low frequency sound range, which is included in the sound signal supplied from the real sound source.
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2. A superdirectional acoustic system comprising:
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a sound source for supplying a sound signal;
a signal isolating device for isolating an audio signal in a relatively medium to high frequency sound range and an audio signal in a relatively low frequency sound range from the sound signal;
an ultrasonic speaker for reproducing the isolated audio signal in the medium to high frequency sound range; and
a low frequency sound reproducing speaker for reproducing the isolated audio signal in the low frequency sound range. - View Dependent Claims (3, 4, 5)
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6. A projector comprising:
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an ultrasonic speaker for reproducing an audio signal in an audio frequency sound range, which is included in a sound signal supplied from a sound source, wherein the ultrasonic speaker includes an ultrasonic transducer for oscillating a sound wave in an ultrasonic frequency band;
a projector main portion having a projection optical system for projecting an image onto a projection surface; and
a low frequency sound reproducing speaker, wherein;
an audio signal in a relatively medium to high frequency sound range, which is included in the sound signal supplied from the sound source, is reproduced by the ultrasonic speaker; and
an audio signal in a relatively low frequency sound range, which is included in the sound signal supplied from the sound source, is reproduced by the low frequency sound reproducing speaker.
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7. A projector comprising:
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a sound source for supplying a sound signal;
a signal isolating device for isolating an audio signal in a relatively medium to high frequency sound range and an audio signal in a relatively low frequency sound range from the sound signal;
an ultrasonic speaker for reproducing the isolated audio signal in the medium to high frequency sound range;
a low frequency sound reproducing speaker for reproducing the isolated audio signal in the low frequency sound range; and
a projector main portion having a projection optical system for projecting an image onto a projection surface. - View Dependent Claims (8, 9, 10)
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Specification