MULTI-CHANNEL AUDIO SYSTEM HAVING A SHARED CURRENT SENSE ELEMENT FOR ESTIMATING INDIVIDUAL SPEAKER IMPEDANCES USING TEST SIGNALS
First Claim
1. A method for operating an audio system having a plurality of speaker drivers, comprising:
- providing a plurality of audio channel test signals simultaneously to inputs of a plurality of audio amplifiers, respectively, while each of the audio amplifiers is driving its respective speaker driver;
sensing current of a single power supply rail that is feeding power to each of the plurality of audio amplifiers, while each of the amplifiers is driving its respective speaker driver, to produce a sensed shared current;
obtaining a measure of input voltage of each of the speaker drivers; and
computing an estimate of electrical input impedance of each of the speaker drivers, using the sensed shared current and the measure of input voltage of said speaker driver.
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Abstract
A programmed data processor obtains a number of input voltage measurements for a number of speaker drivers, respectively, and a sensed shared current being a measure of current in a single power supply rail that is feeding power to each of a number of audio amplifiers while the audio amplifiers are driving the speaker drivers in accordance with a number of audio channel test signals, respectively. The programmed data processor computes an estimate of electrical input impedance of each of the speaker drivers using the input voltage measurement for the speaker driver and using the sensed shared current. Other embodiments are also described and claimed.
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Citations
23 Claims
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1. A method for operating an audio system having a plurality of speaker drivers, comprising:
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providing a plurality of audio channel test signals simultaneously to inputs of a plurality of audio amplifiers, respectively, while each of the audio amplifiers is driving its respective speaker driver; sensing current of a single power supply rail that is feeding power to each of the plurality of audio amplifiers, while each of the amplifiers is driving its respective speaker driver, to produce a sensed shared current; obtaining a measure of input voltage of each of the speaker drivers; and computing an estimate of electrical input impedance of each of the speaker drivers, using the sensed shared current and the measure of input voltage of said speaker driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An audio system comprising:
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a data processor; a power supply rail; a current sense element coupled to the power supply rail to produce a sensed shared current being a measure of current in the power supply rail; a plurality of audio amplifiers each being coupled to be powered by the power supply rail and to receive a respective audio channel test signal; and a plurality of speaker drivers each being coupled to a respective one of the amplifiers; and wherein the data processor obtains a measure of input voltage for each of the speaker drivers, and computes an estimate of electrical input impedance of each of the speaker drivers using the measure of input voltage of the speaker driver and using the sensed shared current. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An audio signal processing system comprising:
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a programmed data processor that is to obtain a plurality of input voltage measurements for a plurality of speaker drivers, respectively, the programmed data processor to obtain a sensed shared current being a measure of current in a single power supply rail that is feeding power to each of a plurality of audio amplifiers, while the audio amplifiers are driving the speaker drivers in accordance with a plurality of audio channel test signals, respectively, and the programmed data processor to compute an estimate of electrical input impedance of each of the speaker drivers using the input voltage measurement for the speaker driver and using the sensed shared current. - View Dependent Claims (20, 21, 22, 23)
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Specification