Method for processing an audio signal with modeling of the overall response of the electrodynamic loudspeaker

A technology for electrodynamic speakers and audio signals, applied in frequency response correction, sensors, electrical components, etc., to solve problems such as linear parameters and nonlinear parameters that do not allow estimation of speaker responses

Inactive Publication Date: 2014-03-26
PARROT
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Problems solved by technology

[0016] However, a drawback of this method is that it requires a previous calibration phase with impedance measurement and application of predetermined signals, which precludes any re-estimation of subsequent parameters by public users
But this approach does not allow to estimate both linear and nonlinear parameters of the loudspeaker response on the fly to apply suitable corrective audio processing afterwards

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  • Method for processing an audio signal with modeling of the overall response of the electrodynamic loudspeaker
  • Method for processing an audio signal with modeling of the overall response of the electrodynamic loudspeaker
  • Method for processing an audio signal with modeling of the overall response of the electrodynamic loudspeaker

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Embodiment Construction

[0043] Modeling the total response of the loudspeaker

[0044] (Thiele and Small parameters)

[0045] We first refer to figure 1 Various parameters and equations are disclosed, which express the response of the electrodynamic loudspeaker HP. These responses are electrically excited by the generator G and transmit a pressure signal on the acoustic load CH.

[0046] The left half schematically represents the electrical part of the speaker, to which a measurable excitation voltage Umes is applied, which comes from an amplifier that generates a current i, which is also measurable and passes through the speaker coil. The first ratio transformer BI roughly represents the electrical-mechanical force conversion applied to the coil. Finally, the ratio gyrator Sd roughly represents the mechanical (displacement of the speaker diaphragm)-sound pressure conversion.

[0047] The components (resistance, inductance, and capacitance) of the equivalent diagram model electrical, mechanical (for example...

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Abstract

Provided is a method for processing an audio signal with modeling of the overall response of an electrodynamic loudspeaker. The method comprises the determination of an observation vector that comprises only electrical measurements of the voltage (Umes) at the loudspeaker terminals and of the current (i) passing through the loudspeaker, and a state vector (X) whose components comprise: values of linear parameters of the loudspeaker response such as the electrical (Re) and mechanical (Req) resistance, and polynomial coefficients of nonlinear parameters such as the force factor (Bl), the equivalent stiffness (Keq) and the electrical inductance (Le). The voltage and current measurements are applied to an estimator with a predictive filter of the extended Kalman filter incorporating a representation of a dynamic model of the loudspeaker. This filter operates a prediction of the state vector (X) and readjusts this prediction by calculation of an estimate (Uest) of the voltage based on the state vector and on the measured current and comparison of this estimate with the measurement (Umes) of the voltage.

Description

Invention field [0001] The present invention relates to a technique for processing an audio signal based on the estimation of the total response of a speaker intended to reproduce the audio signal, that is, taking into account all electrical, mechanical and acoustic parameters that characterize the response. Background technique [0002] The matter is that when the audio signal is amplified and applied to the speaker, the physical properties of the speaker are modeled to simulate its operation, so that various correction processing operations can be performed on the audio signal upstream to optimize the final sound reproduction presented to the listener the quality of. [0003] In particular, it is currently necessary to consolidate low frequencies to compensate for the fact that speakers or bass amplifiers (usually installed in open (ventilation systems) or closed sound insulation panels) dedicated to this type of register have the lowest performance The frequency has always been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
CPCH04R3/04H04R29/003
Inventor V·翁珂推
Owner PARROT
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