Abstract: A method for determining a voice coil position of a voice coil includes providing a magnetic circuit having a magnetic gap and suspending the voice coil in the magnetic gap, applying a driving signal to the voice coil to produce an electromotive force, providing inductive sensors mechanically coupled to the voice coil, measuring inductive sensor signals based on outputs from the inductive sensors, processing the measured inductive sensor signals by determining at least one inductive sensor signal ratio, and determining a representation of the voice coil position based on the at least one inductive sensor signal ratio. A voice coil system, which can be incorporated in a loudspeaker, is configured to carry out the method.

Abstract: A method for powering an audio amplifier includes receiving an input audio signal in an audio signal processor, delaying the input audio signal in the audio signal processor to generate a delayed audio signal, predicting a power demand estimate by analyzing the input audio signal to calculate the power demand estimate in the audio signal processer, and selecting, by the audio signal processor, power conversion settings for a DC to DC converter on the basis of the power demand estimate. The method further includes supplying power input to the DC to DC converter, converting the power input in accordance with the power conversion settings to provide a power output, powering the audio amplifier using the power output, and supplying the delayed audio signal to the audio amplifier from the audio signal processor to generate an amplified audio signal.

Abstract: A method for driving a voice coil of a loudspeaker may include providing a magnetic circuit having an air gap, providing a voice coil suspended in the air gap, and applying an audio signal to the voice coil to move it along a travelling axis. The voice coil comprises a main voice coil section, and a pair of auxiliary voice coil sections arranged along the travelling axis with auxiliary voice coil sections arranged respectively on either side of the main voice coil section. Applying an audio signal comprises continuously coupling a main driving signal based on the audio signal to the main voice coil and selectively coupling an auxiliary driving signal based on the audio signal to the pair of auxiliary voice coil sections. The disclosed embodiments further relate to a voice coil driving system and a loudspeaker comprising a voice coil driving system.

Abstract: A method for powering an audio amplifier includes receiving an input audio signal in an audio signal processor, delaying the input audio signal in the audio signal processor to generate a delayed audio signal, predicting a power demand estimate by analyzing the input audio signal to calculate the power demand estimate in the audio signal processer, and selecting, by the audio signal processor, power conversion settings for a DC to DC converter on the basis of the power demand estimate. The method further includes supplying power input to the DC to DC converter, converting the power input in accordance with the power conversion settings to provide a power output, powering the audio amplifier using the power output, and supplying the delayed audio signal to the audio amplifier from the audio signal processor to generate an amplified audio signal.

Abstract: A method for driving a voice coil of a loudspeaker may include providing a magnetic circuit having an air gap, providing a voice coil suspended in the air gap, and applying an audio signal to the voice coil to move the voice coil along a travelling axis. The voice coil comprises a center voice coil section, an upper voice coil section, and a lower voice coil section arranged on respective sides of the center voice coil section. A center driving signal is provided to the center voice coil and an upper rectified driving signal, attenuating a first direction of current, and a lower rectified driving signal, attenuating a second direction of current, are provided respectively to the upper and lower voice coil sections. The invention further relates to a voice coil driving system and a loudspeaker comprising a voice coil driving system.

Abstract: A method for driving a voice coil of a loudspeaker may include providing a magnetic circuit having an air gap, providing a voice coil suspended in the air gap, and applying an audio signal to the voice coil to move the voice coil along a travelling axis. The voice coil comprises a center voice coil section, an upper voice coil section, and a lower voice coil section arranged on respective sides of the center voice coil section. A center driving signal is provided to the center voice coil and an upper rectified driving signal, attenuating a first direction of current, and a lower rectified driving signal, attenuating a second direction of current, are provided respectively to the upper and lower voice coil sections. The invention further relates to a voice coil driving system and a loudspeaker comprising a voice coil driving system.

Abstract: A method for determining a voice coil position of a voice coil includes providing a magnetic circuit having a magnetic gap and suspending the voice coil in the magnetic gap, applying a driving signal to the voice coil to produce an electromotive force, providing inductive sensors mechanically coupled to the voice coil, measuring inductive sensor signals based on outputs from the inductive sensors, processing the measured inductive sensor signals by determining at least one inductive sensor signal ratio, and determining a representation of the voice coil position based on the at least one inductive sensor signal ratio. A voice coil system, which can be incorporated in a loudspeaker, is configured to carry out the method.

Abstract: A method for driving a voice coil of a loudspeaker may include providing a magnetic circuit having an air gap, providing a voice coil suspended in the air gap, and applying an audio signal to the voice coil to move it along a travelling axis. The voice coil comprises a main voice coil section, and a pair of auxiliary voice coil sections arranged along the travelling axis with auxiliary voice coil sections arranged respectively on either side of the main voice coil section. Applying an audio signal comprises continuously coupling a main driving signal based on the audio signal to the main voice coil and selectively coupling an auxiliary driving signal based on the audio signal to the pair of auxiliary voice coil sections. The disclosed embodiments further relate to a voice coil driving system and a loudspeaker comprising a voice coil driving system.