Apparatus and method for measuring speaker transducer impedance versus frequency with ultralow inaudible signal

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United States of America Patent

PATENT NO 11070179
APP PUB NO 20210075384A1
SERIAL NO

16562116

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Abstract

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An apparatus measures a speaker impedance. A DAC converts a known digital input signal to an audio frequency first analog voltage signal. Resistors with known resistance attenuate the first analog voltage signal to generate a current. The known resistance effectively determines the current because the known resistance is high relative to the speaker impedance. The current is sourced into the speaker to generate a second analog voltage signal. The known resistance is sufficiently high to cause the second analog voltage signal to be inaudible as transduced by the speaker. An amplifier amplifies the second analog voltage signal with a known gain to generate a third analog voltage signal. An ADC converts the third analog voltage signal to a digital output signal. A processing element calculates the impedance of the speaker proportional to the digital output signal based on the known digital input signal, the known resistance, and the known gain.

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Patent Owner(s)

Patent OwnerAddress
CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTDEDINBURGH LOTHIAN EH3 9EG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cheng, Frank Austin, US 8 12
Jiang, Ruoxin Austin, US 13 88
You, Zhong Austin, US 44 462

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