Speaker distortion correction device

A speaker distortion correction device comprising:

• an amplifier configured to drive a speaker;
• a distortion corrector, an input signal being input to the distortion corrector, and an output of the distortion corrector being input to the amplifier;
• and
• a displacement detector configured to detect displacement of a vibration system of the speaker,
• wherein the distortion corrector includes:
• an attenuator configured to generate an attenuated input signal by attenuating the input signal with a variable attenuation amount;
• a nonlinear distortion controller configured to generate a corrected signal obtained by performing a nonlinear distortion correction process on the input signal or the attenuated input signal to correct the input signal or the attenuated input signal so that nonlinear distortion of the speaker is suppressed when the corrected signal is input to the amplifier;
• a maximum value calculating section configured to calculate a maximum output value of the amplifier to be obtained when the corrected signal obtained by performing the nonlinear distortion correction process on the input signal is input to the amplifier, based on at least the input signal and a gain of the amplifier, the gain of the amplifier being calculated based on the displacement detected by the displacement detector;
• and
• a selector configured to select, as the output of the distortion corrector, the corrected signal obtained by performing the nonlinear distortion correction process on the input signal when the maximum output value calculated by the maximum value calculating section does not exceed a predetermined threshold, and select, as the output of the distortion corrector, the corrected signal obtained by performing the nonlinear distortion correction process on the attenuated input signal generated by the variable attenuation amount being set so that a level of the attenuated input signal is less than or equal to a predetermined level when the maximum output value calculated by the maximum value calculating section exceeds the predetermined threshold.

A speaker distortion correction device comprising:

• an amplifier configured to drive a speaker;
• a distortion corrector, an input signal being input to the distortion corrector, and an output of the distortion corrector being input to the amplifier;
• and
• a displacement detector configured to detect displacement of a vibration system of the speaker,
• wherein the distortion corrector includes:
• a band divider configured to divide the input signal into a plurality of band input signals for a plurality of bands;
• a plurality of band distortion correctors provided respectively corresponding to the plurality of bands, and the plurality of band input signals being respectively input to the plurality of band distortion correctors;
• and
• a mixer configured to synthesize outputs of the plurality of band distortion correctors as the output of the distortion corrector,
• wherein each of the plurality of band distortion correctors includes:
• a nonlinear distortion controller configured to generate a corrected signal obtained by performing a nonlinear distortion correction process on a corresponding band input signal among the plurality of band input signals to correct the corresponding band input signal so that nonlinear distortion of the speaker is suppressed when the corrected input signal is input to the amplifier;
• a maximum value calculating section configured to calculate a maximum output value of the amplifier to be obtained when the corrected signal generated by the nonlinear distortion controller is input to the amplifier, based on at least the corresponding band input signal and a gain of the amplifier, the gain of the amplifier being calculated based on the displacement detected by the displacement detector;
• and
• a selector configured to select, as the output of the distortion corrector, the corrected signal generated by the nonlinear distortion controller when the calculated maximum output value calculated by the maximum value calculating section does not exceed a predetermined threshold and select, as the output of the distortion corrector, the corresponding band input signal on which the nonlinear distortion correction process is not performed by the nonlinear distortion controller when the calculated maximum output value calculated by the maximum value calculating section exceeds the predetermined threshold.

A speaker distortion correction device comprising:

• an amplifier configured to drive a speaker;
• a distortion corrector, an input signal being input to the distortion corrector, and an output of the distortion corrector being input to the amplifier;
• and
• a displacement detector configured to detect displacement of a vibration system of the speaker,
• wherein the distortion corrector includes:
• a band divider configured to divide the input signal into a plurality of band input signals for a plurality of bands;
• a plurality of band distortion correctors provided respectively corresponding to the plurality of bands, and the plurality of band input signals being respectively input to the plurality of band distortion correctors;
• and
• a mixer configured to synthesize outputs of the plurality of band distortion correctors as the output of the distortion corrector,
• wherein each of the plurality of band distortion correctors includes:
• an attenuator configured to generate an attenuated input signal by attenuating a corresponding band input signal among the plurality of band input signals with a variable attenuation amount;
• a nonlinear distortion controller configured to generate a corrected signal obtained by performing a nonlinear distortion correction process on the corresponding band input signal or the attenuated input signal to correct the input signal or the attenuated input signal so that nonlinear distortion of the speaker is suppressed when the corrected signal is input to the amplifier;
• a maximum value calculating section configured to calculate a maximum output value of the amplifier to be obtained when the corrected signal obtained by the nonlinear distortion controller performing the nonlinear distortion correction process on the corresponding band input signal is input to the amplifier, based on at least the corresponding band input signal and a gain of the amplifier, the gain of the amplifier being calculated based on the displacement detected by the displacement detector;
• and
• a selector configured to select, as the output of the distortion corrector, the corrected signal obtained by performing the nonlinear distortion correction process on the corresponding band input signal when the maximum output value calculated by the maximum value calculating section does not exceed a predetermined threshold, and set an attenuation amount as the variable attenuation amount to generate the attenuated input signal whose level is less than or equal to a predetermined level and select, as the output of the distortion corrector, the corrected signal obtained by performing the nonlinear distortion correction process on the attenuated input signal when the maximum output value calculated by the maximum value calculating section exceeds the predetermined threshold.