SYSTEM TO GENERATE ELECTRICAL SIGNALS FOR A LOUDSPEAKER
First Claim
Patent Images
1. An apparatus for use with an acoustic transducer including a piezoelectric actuator, said apparatus comprising:
- an error amplifier circuit configured to receive an input signal and a feedback signal and to provide an output based at least in part on said input signal and said feedback signal wherein said input signal is an audio frequency signal;
an output stage coupled to said error amplifier circuit, said output stage configured to receive said output from said error amplifier circuit and to generate an output signal, based at least in part on said output from said error amplifier circuit wherein said output signal is configured to drive said piezoelectric actuator; and
a charge sensing circuit configured to sense a charge associated with said piezoelectric actuator, wherein said feedback signal is based, at least in part, on said sensed charge.
1 Assignment
0 Petitions
Accused Products
Abstract
The present disclosure describes an apparatus and a system for generating electrical signals for a loudspeaker. The loudspeaker may include one or more piezoelectric actuators configured to deflect a diaphragm of the loudspeaker in response to an input signal. The apparatus may be configured to receive the input signal and to drive the piezoelectric actuators to deflect the diaphragm based on the received input signal.
157 Citations
21 Claims
-
1. An apparatus for use with an acoustic transducer including a piezoelectric actuator, said apparatus comprising:
-
an error amplifier circuit configured to receive an input signal and a feedback signal and to provide an output based at least in part on said input signal and said feedback signal wherein said input signal is an audio frequency signal; an output stage coupled to said error amplifier circuit, said output stage configured to receive said output from said error amplifier circuit and to generate an output signal, based at least in part on said output from said error amplifier circuit wherein said output signal is configured to drive said piezoelectric actuator; and a charge sensing circuit configured to sense a charge associated with said piezoelectric actuator, wherein said feedback signal is based, at least in part, on said sensed charge. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An acoustic transducer that converts a mechanical motion into acoustical energy, said acoustic transducer comprising:
-
a diaphragm that is curved; at least one support on at least one portion of said diaphragm; at least one piezoelectric actuator operatively coupled to said diaphragm and spaced from said support, said actuator configured to move such that movement of said actuator produces corresponding movement of said diaphragm, said diaphragm movement being amplified with respect to said actuator movement; an error amplifier circuit configured to receive an input signal and a feedback signal and to provide an output based at least in part on said input signal and said feedback signal wherein said input signal is an audio frequency signal; an output stage coupled to said error amplifier circuit, said output stage configured to receive said output from said error amplifier circuit and to generate an output signal, based at least in part on said output from said error amplifier circuit wherein said output signal is configured to drive said piezoelectric actuator; and a charge sensing circuit configured to sense a charge associated with said piezoelectric actuator, wherein said feedback signal is based, at least in part, on said sensed charge. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A system comprising:
-
an acoustic transducer comprising a piezoelectric actuator; and an apparatus for driving said piezoelectric actuator, said apparatus comprising; an error amplifier circuit configured to receive an input signal and a feedback signal and to provide an output based at least in part on said input signal and said feedback signal wherein said input signal is an audio frequency signal; an output stage coupled to said error amplifier circuit, said output stage configured to receive said output from said error amplifier circuit and to generate an output signal, based at least in part on said output from said error amplifier circuit wherein said output signal is configured to drive said piezoelectric actuator; and a charge sensing circuit configured to sense a charge associated with said piezoelectric actuator, wherein said feedback signal is based, at least in part, on said sensed charge. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
Specification