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US 9,807,518 B2Granted
Acoustic transducer
AssigneeHarman Becker Gepkocsirendszer Gyarto Korlatolt Felelossegu Tarsasag
InventorsJohn B. French, Andrew J. Mason
Life of this patent
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Abstract
This invention relates to acoustic drivers with stationary and moving coils. Time varying signals are applied to the moving and stationary coils to control the movement of a diaphragm, which produces audible sound. The time varying signals correspond to an input audio signal such that the sound corresponds to the input audio signal. Some of the described embodiments include multiple moving coils, multiple stationary coils or both. Some embodiments include feedback for adjusting one or more of the signals based on a characteristic of the acoustic driver. Various compensation and other features of the invention are also described in relation to various embodiments.
Claims19
An acoustic transducer comprising:
- an audio input terminal for receiving an input audio signal;
- at least one stationary coil for inducing a magnetic flux path;
- at least one moving coil coupled to a diaphragm, wherein the at least one moving coil is disposed at least partially within the magnetic flux path;
- and
- a control system including a first block and a second block, each of the first block and the second block being coupled to the audio input terminal to receive the input audio signal, the first block being configured to transmit a time-varying stationary coil signal to the at least one stationary coil and the second block being configured to transmit a time-varying moving coil signal to the at least one moving coil, wherein the diaphragm moves in response to the stationary coil signal and the moving coil signal,
- wherein the first block includes a compensation block configured to adjust the time-varying stationary coil signal based on a saturation characteristic.
3 more elements
An acoustic transducer comprising:
- an audio input terminal for receiving an input audio signal;
- at least one stationary coil for inducing a magnetic flux path;
- at least one moving coil coupled to a diaphragm, wherein the at least one moving coil is disposed at least partially within the magnetic flux path;
- a magnetic material including an air gap in which the magnetic flux path flows within the magnetic material through the air gap;
- and
- a control system including a stationary coil signal block and a moving coil signal block, each of the stationary coil signal block and the moving coil signal block being coupled to the audio input terminal to receive the input audio signal, the stationary coil signal block being configured to transmit a stationary coil signal to the at least one stationary coil and the moving coil signal block being configured to transmit a moving coil signal to the at least one moving coil, wherein the diaphragm moves in response to the stationary coil signal and the moving coil signal,
- wherein the stationary coil signal block includes a compensation block configured to adjust the stationary coil signal based on at least one of a saturation characteristic and a characteristic of the air gap.
4 more elements
An acoustic transducer comprising:
- an audio input terminal for receiving an input audio signal;
- at least one stationary coil for inducing a magnetic flux path;
- at least one moving coil coupled to a diaphragm, wherein the at least one moving coil is disposed at least partially within the magnetic flux path;
- a magnetic material including an air gap in which the magnetic flux path flows within the magnetic material through the air gap;
- and
- a control system including a stationary coil signal block and a moving coil signal block, each of the stationary coil signal block and the moving coil signal block being coupled to the audio input terminal to receive the input audio signal, the stationary coil signal block being configured to transmit a time-varying stationary coil signal to the at least one stationary coil and the moving coil signal block being configured to transmit a time-varying moving coil signal to the at least one moving coil,
- wherein the stationary coil signal block includes a compensation block configured to adjust the time-varying stationary coil signal based on at least one of a saturation characteristic and a characteristic of the air gap.
4 more elements
An acoustic transducer comprising:
- an audio input terminal for receiving an input audio signal;
- at least one stationary coil for inducing a magnetic flux path;
- at least one moving coil coupled to a diaphragm, wherein the at least one moving coil is disposed at least partially within the magnetic flux path;
- a control system including a first block and a second block, each of the first block and the second block being coupled to the audio input terminal to receive the input audio signal, the first block being configured to transmit a time-varying stationary coil signal to the at least one stationary coil and the second block being configured to transmit a time-varying moving coil signal to the at least one moving coil, wherein the diaphragm moves in response to the time-varying stationary coil signal and the time-varying moving coil signal;
- and
- a coil loss compensation block configured to adjust the time-varying moving coil signal based on a saturation characteristic.
3 more elements
Dependencies are inferred from the claim text.