An acoustic transducer comprising:nan audio input terminal for receiving an input audio signal;one or more stationary coils for inducing a magnetic flux path;one or more moving coils coupled to a moving diaphragm, wherein the one or more moving coils are disposed at least partially within the magnetic flux path;a control system coupled to the input terminal and adapted to produce a time-varying stationary coil signal in at least one of the stationary coils and to produce a time-varying moving coil signal in each of the one or more moving coils, and wherein all of the stationary coil signals and the moving coil signals are dependent on the input audio signal,wherein the movement of the diaphragm is in response to the stationary coil signals and the moving coil signal, andwherein the control system includes:na stationary coil signal generation block to generate one or more stationary coil control signals corresponding to the input audio signal;one or more stationary coil current regulators to generate the stationary coil signals corresponding to the stationary coil control signals;a moving coil signal block to generate one or more moving coil control signals corresponding to the input audio signal; andone or more moving coil current regulators to generate the moving coil signals corresponding to the moving coil control signals.
›2.↳ 1The acoustic transducer of claim 1, further including a magnetic material that has an air gap, and wherein the magnetic flux path flows within the mag…d2+1
The acoustic transducer of claim 1, further including a magnetic material that has an air gap, and wherein the magnetic flux path flows within the magnetic material through the air gap.
›3.↳ 2The acoustic transducer of claim 2, wherein at least one of the moving coils is disposed in the air gap.d3
The acoustic transducer of claim 2, wherein at least one of the moving coils is disposed in the air gap.
›4.↳ 1The acoustic transducer of claim 1, further including a bucking coil in series with at least one selected moving coil and wound with a polarity opposi…d2
The acoustic transducer of claim 1, further including a bucking coil in series with at least one selected moving coil and wound with a polarity opposing the polarity of the at least one selected moving coil.
›5.↳ 1The acoustic transducer of claim 1, further including a bucking coil mounted to a stationary component of the acoustic transducer.d2
The acoustic transducer of claim 1, further including a bucking coil mounted to a stationary component of the acoustic transducer.
›6.↳ 1The acoustic transducer of claim 1, wherein the stationary coil signals are unidirectional causing magnetic flux to flow in the magnetic flux path in …d2
The acoustic transducer of claim 1, wherein the stationary coil signals are unidirectional causing magnetic flux to flow in the magnetic flux path in a single direction, and wherein the moving coil signals are bidirectional.
›7.↳ 1The acoustic transducer of claim 1, wherein the stationary coil signals are bidirectional and wherein the moving coil signals are bidirectional.d2
The acoustic transducer of claim 1, wherein the stationary coil signals are bidirectional and wherein the moving coil signals are bidirectional.
›8.↳ 1The acoustic transducer of claim 1, further including a rectifier coupled to the audio input terminal for providing a rectified audio signal correspon…d2
The acoustic transducer of claim 1, further including a rectifier coupled to the audio input terminal for providing a rectified audio signal corresponding to the input audio signal and wherein the stationary coil signal generation block is coupled to the rectifier and adapted to generate at least one of the stationary coil signals corresponding to rectified input signal.
›9.↳ 1The acoustic transducer of claim 1, further including a rectifier coupled to the audio input terminal for providing a rectified audio signal correspon…d2+1
The acoustic transducer of claim 1, further including a rectifier coupled to the audio input terminal for providing a rectified audio signal corresponding to the input audio signal and wherein the stationary coil signal generation block is coupled to rectifier and adapted to generate at least one of the stationary coil signals corresponding to a square root of the rectified audio signal.
›10.↳ 9The acoustic transducer of claim 9, wherein the moving coil signal block is adapted to generate the moving coil control signal corresponding to the sq…d3
The acoustic transducer of claim 9, wherein the moving coil signal block is adapted to generate the moving coil control signal corresponding to the square root of the input audio signal.
›11.↳ 1The acoustic transducer of claim 1, wherein the moving coil signal block is coupled to the stationary coil signal generation block and wherein the mov…d2
The acoustic transducer of claim 1, wherein the moving coil signal block is coupled to the stationary coil signal generation block and wherein the moving coil signal block is adapted to generate at least one of the moving coil control signals in response to the input audio signal and at least one of the stationary coil control signals.
›12.↳ 1The acoustic transducer of claim 1, wherein the stationary coil signal generation block is coupled to the moving coil signal block and wherein the sta…d2
The acoustic transducer of claim 1, wherein the stationary coil signal generation block is coupled to the moving coil signal block and wherein the stationary coil signal generation block is adapted to generate at least one of the stationary coil signals in response to the input audio signal and at least one of the moving coil signals.
›13.↳ 1The acoustic transducer of claim 1, wherein the control system includes a stationary coil signal generation block to generate the stationary coil sign…d2
The acoustic transducer of claim 1, wherein the control system includes a stationary coil signal generation block to generate the stationary coil signals and wherein the stationary coil signals are generated as digital signals and wherein each of the stationary coil signals energizes a corresponding stationary coil at a fixed level when the stationary coil signal is high.
›14.↳ 1The acoustic transducer of claim 1, including at least two stationary coils and wherein each of the stationary coil signals is a digital signal that s…d2+1
The acoustic transducer of claim 1, including at least two stationary coils and wherein each of the stationary coil signals is a digital signal that selectively energizes a corresponding stationary coil.
›15.↳ 14The acoustic transducer of claim 14, wherein each of the coils applies a different magnetic field to a magnetic material in response to a correspondin…d3
The acoustic transducer of claim 14, wherein each of the coils applies a different magnetic field to a magnetic material in response to a corresponding stationary coil signal.
›16.↳ 1The acoustic transducer of claim 1, wherein the stationary coil signal generation block includes a compensation block adapted to adjust the stationary…d2
The acoustic transducer of claim 1, wherein the stationary coil signal generation block includes a compensation block adapted to adjust the stationary coil signal.
›17.↳ 1The acoustic transducer of claim 1, wherein the stationary coil signal generation block includes a compensation block adapted to adjust the stationary…d2+1
The acoustic transducer of claim 1, wherein the stationary coil signal generation block includes a compensation block adapted to adjust the stationary coil signal based on a saturation characteristic.
›18.↳ 17The acoustic transducer of claim 17, further including a coil loss compensation block adapted to adjust the moving coil signal based on the saturation…d3
The acoustic transducer of claim 17, further including a coil loss compensation block adapted to adjust the moving coil signal based on the saturation characteristic.
›19.↳ 1The acoustic transducer of claim 1, wherein one of:nthe moving coil signal, andthe stationary coil signals,corresponds to the other one of:the moving …d2
The acoustic transducer of claim 1, wherein one of:nthe moving coil signal, andthe stationary coil signals,corresponds to the other one of:the moving coil signal, andthe stationary coil signals.
