Control of loudspeaker output

A loudspeaker and processor technology, applied in the direction of sensors, transducer circuits, sensor components, etc., can solve problems such as the model is no longer valid, the speaker falls to the ground, and the closed box model is no longer valid, etc., to achieve noise robustness, Resolving Effects on Complex Designs

Active Publication Date: 2012-12-26
GOODIX TECH HK CO LTD
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Problems solved by technology

Other discrepancies between expected and actual behavior can be attributed to defects caused during the production process or caused by mechanical damage (e.g. loudspeakers falling to the floor, and closed boxes becoming leaky due to small cracks), which may cause the model to no longer be valid
For example, if a closed box model is used, but

Method used

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  • Control of loudspeaker output
  • Control of loudspeaker output
  • Control of loudspeaker output

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Embodiment Construction

[0028] The present invention provides a method of controlling the output of a loudspeaker, said method comprising deriving an admittance function over time from voice coil voltage and current signals (the admittance function is the reciprocal of the impedance function such that either can be derived, and can be obtained by a simple Operate the reciprocal function to make the two interchangeable). Combine the delta function, the force factor of the loudspeaker, and the blocking electrical impedance to derive the input voltage-to-displacement transfer function over time. The input voltage to offset transfer function over time is used to control the audio processing of the loudspeaker for loudspeaker protection and / or acoustic signal processing.

[0029] The present invention provides a modeling approach that is based on measurements of the electrical impedance / admittance of the loudspeaker over time rather than complex parameter-based models. Apart from the measured impedance / a...

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Abstract

A method of controlling a loudspeaker output comprises deriving (10) an admittance function (y[k],16) over time from the voice coil voltage (v[k]) and current (i[k]). In combination with a delta function (´[k]), the force factor (¦) of the loudspeaker and the blocked electrical impedance (R e ), the input-voltage-to-excursion transfer function (h vx [k]) over time is obtained. This is used to control audio processing for the loudspeaker thereby to implement loudspeaker protection and/or acoustic signal processing. The invention provides a modelling and control approach which is not based on a parametric model. As a consequence, it does not require prior knowledge regarding the enclosure (e.g. closed or vented box) and can cope with complex designs of the enclosure.

Description

technical field [0001] The present invention relates to the control of loudspeaker output. Background technique [0002] It is known that the output of a loudspeaker should be controlled such that it cannot be simply driven by any input signal. For example, a significant cause of loudspeaker failure is a mechanical defect that occurs when the loudspeaker diaphragm displaces beyond a certain limit, usually provided by the manufacturer. Exceeding this displacement limit can damage the loudspeaker immediately, or can drastically reduce its expected lifetime. [0003] There are several methods for limiting the displacement of the loudspeaker's diaphragm, such as processing the input signal with a variable cutoff filter (high pass or otherwise) whose characteristics are controlled via a feedforward or feedback control loop. The measured control signal is called a displacement predictor, and this requires modeling the loudspeaker characteristics such that displacement can be pre...

Claims

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Application Information

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IPC IPC(8): H04R3/00
CPCH04R3/08H04R29/003H04R3/002H04R3/007
Inventor 泰穆金·高塔马
Owner GOODIX TECH HK CO LTD
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