Method of estimating diaphragm excursion of a loudspeaker
First Claim
1. A method of estimating an excursion of a diaphragm of a loudspeaker, comprising:
- receiving an audio input signal and generating an audio output signal based on the audio input signal;
applying the audio output signal to a coil of the loudspeaker;
detecting a coil voltage and a coil current in response to the applied audio output signal;
computing a plurality of parameters corresponding to the loudspeaker by applying information about the detected coil current and coil voltage to a linear model of the loudspeaker;
interrupting the computing the plurality of parameters based on a result of a comparison of the audio input signal with a spectral criterion; and
determining the excursion of the diaphragm of the loudspeaker by applying, to a non-linear model of the loudspeaker, the audio input signal and the plurality of parameters computed using the linear model of the loudspeaker.
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Abstract
A method of estimating diaphragm excursion of an electrodynamic loudspeaker may be performed using audio signals. An audio output signal may be applied to a voice coil of the electrodynamic loudspeaker through an output amplifier to produce sound. A detected voice coil current and a determined voice coil voltage may be applied to a linear adaptive digital loudspeaker model that has a plurality of adaptive loudspeaker parameters. The parameter values of the adaptive loudspeaker parameters may be computed based on the linear adaptive digital loudspeaker model and applied to a non-linear state-space model of the electrodynamic loudspeaker. For the non-linear state-space model, a predetermined non-linear function may be applied to at least one of the plurality of received parameter values to compute at least one non-linearity compensated parameter value of the adaptive loudspeaker parameters, to determine an instantaneous excursion of the diaphragm.
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Citations
30 Claims
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1. A method of estimating an excursion of a diaphragm of a loudspeaker, comprising:
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receiving an audio input signal and generating an audio output signal based on the audio input signal; applying the audio output signal to a coil of the loudspeaker; detecting a coil voltage and a coil current in response to the applied audio output signal; computing a plurality of parameters corresponding to the loudspeaker by applying information about the detected coil current and coil voltage to a linear model of the loudspeaker; interrupting the computing the plurality of parameters based on a result of a comparison of the audio input signal with a spectral criterion; and determining the excursion of the diaphragm of the loudspeaker by applying, to a non-linear model of the loudspeaker, the audio input signal and the plurality of parameters computed using the linear model of the loudspeaker. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A sound reproduction assembly for a loudspeaker, comprising:
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an input for receiving an audio input signal supplied by a source; an amplifier configured to receive the audio input signal and generate a corresponding audio output signal as a voltage at a pair of output terminals connectable to a coil of the loudspeaker; a detector configured to detect the voltage and a current flowing into the coil in response to the application of the voltage; and a processor configured to; apply the detected current and the detected voltage to a linear model of the loudspeaker to compute a plurality of parameters, interrupt the computing the plurality of parameters based on a result of a comparison of the audio input signal with a spectral criterion, and apply the plurality of parameters to a non-linear model of the loudspeaker to determine an excursion of a diaphragm of the loudspeaker. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification