Apparatus and method for measuring speaker transducer impedance versus frequency with ultralow inaudible signal
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United States of America Patent
Stats
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Jul 20, 2021
Grant Date -
Mar 11, 2021
app pub date -
Sep 5, 2019
filing date -
Sep 5, 2019
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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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International Classification(s)
- 2019 Application Filing Year
- H03M Class
- 2157 Applications Filed
- 1756 Patents Issued To-Date
- 81.41 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- H03M Class
- 0 % this patent is cited more than
- 4 Age
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