METHOD AND DEVICE FOR DETECTING A DISPLACEMENT AND MOVEMENT OF A SOUND PRODUCING UNIT OF A WOOFER
First Claim
1. A system, comprising:
- a loudspeaker system comprising a woofer installed in a housing, said woofer comprising a sound producing unit;
a transmitter for transmitting an ultrasonic audio signal;
a receiver for receiving the ultrasonic audio signal;
a detection unit for determining the position of the sound producing unit on the basis of a phase difference between the ultrasonic audio signal received by the receiver and the ultrasonic audio signal transmitted from the transmitter, said phase difference being dependent on the length of the signal path between the transmitter and the receiver;
a control unit for adjusting a spring constant effecting to the sound producing unit of the woofer on the basis of the determined position.
1 Assignment
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Accused Products
Abstract
A system for adjusting a response of a loudspeaker system. The system includes a woofer installed in a housing. The woofer includes a woofer cone. A transmitter for transmitting an ultrasonic audio signal towards the woofer cone. A receiver for receiving the ultrasonic audio signal. A detection unit for determining the position of the woofer cone on the basis of a difference between the phase of the reflected ultrasonic audio signal with respect to the ultrasonic audio signal transmitted from the transmitter. A control unit for adjusting a spring constant of the membrane of the loudspeaker system on the basis of the determined position. A method for adjusting a response of a loudspeaker system, to a module to be used in the system. A computer program product including computer code for adjusting a response of the loudspeaker system.
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Citations
26 Claims
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1. A system, comprising:
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a loudspeaker system comprising a woofer installed in a housing, said woofer comprising a sound producing unit; a transmitter for transmitting an ultrasonic audio signal; a receiver for receiving the ultrasonic audio signal; a detection unit for determining the position of the sound producing unit on the basis of a phase difference between the ultrasonic audio signal received by the receiver and the ultrasonic audio signal transmitted from the transmitter, said phase difference being dependent on the length of the signal path between the transmitter and the receiver; a control unit for adjusting a spring constant effecting to the sound producing unit of the woofer on the basis of the determined position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for adjusting a response of a loudspeaker system comprising a woofer installed in a housing, said woofer comprising a sound producing unit, the method comprising:
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transmitting an ultrasonic audio signal; receiving the ultrasonic audio signal; determining the position of the sound producing unit on the basis of a phase difference between the received ultrasonic audio signal and the transmitted ultrasonic audio signal, said phase difference being dependent on the length of the signal path between the transmitter and the receiver; and adjusting a spring constant effecting to the sound producing unit of the woofer on the basis of the determined position. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A module to be used in a system comprising a loudspeaker system comprising a woofer installed in a housing, said woofer comprising a sound producing unit, a transmitter for transmitting an ultrasonic audio signal;
- and a receiver for receiving the ultrasonic audio signal, said module comprising;
a detection unit for determining the position of the sound producing unit on the basis of a phase difference between the received ultrasonic audio signal and the ultrasonic audio signal transmitted from the transmitter, said phase difference being dependent on the length of the signal path between the transmitter and the receiver; and a control unit for adjusting a spring constant effecting to the sound producing unit of the woofer on the basis of the determined position.
- and a receiver for receiving the ultrasonic audio signal, said module comprising;
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23. A computer program product, comprising:
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a computer readable medium; and computer code recorded on the computer readable medium and executable by a processor for adjusting a response of a loudspeaker system comprising a woofer installed in a housing, said woofer comprising a sound producing unit, the computer code for transmitting an ultrasonic audio signal; receiving the modulated ultrasonic audio signal; determining the position of the sound producing unit on the basis of a phase difference between the received ultrasonic audio signal and the transmitted ultrasonic audio signal, said phase difference being dependent on the length of the signal path between the transmitter and the receiver; and adjusting a spring constant effecting to the sound producing unit of the woofer on the basis of the determined position. - View Dependent Claims (24, 25, 26)
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Specification