US 2020/0005759 A1 · SYSTEM AND METHOD FOR CALIBRATING AND TESTING AN ACTIVE NOISE CANCELLATION (ANC) SYSTEM

Abstract

A method for calibrating an ANC-enabled portable audio device having microphones plays continuously a calibration sound by a calibrated speaker of a test station separate from the device. For each microphone of all the microphones, a microphone calibration value is computed using a comparison of a predetermined level and a measured level of an audio signal transduced by the microphone in response to the continuously-played calibration sound. The calibration is done without using a microphone of the test station. A processing element of the device may be programmed to make the comparison and computation. The processing element also causes a speaker of the device to generate a second calibration sound, measures a second level while the computed calibration value is applied to one of microphones (e.g., error microphone), and computes a calibration value for the device speaker using a comparison of a predetermined level and the second level.

Claims26

Dependent claims

A method for calibrating an active noise cancellation (ANC)-enabled portable audio device having microphones, comprising:

playing continuously a calibration sound by a calibrated speaker of a test station that is separate from the portable audio device;
for each microphone of all the microphones of the portable audio device:
measuring a level of an audio signal transduced by the microphone in response to the continuously-played calibration sound;
making a comparison of a predetermined level and the measured level;
and
computing a calibration value for the microphone using the comparison;
wherein said measuring, said making the comparison and said computing the calibration value are performed for all of the microphones of the portable audio device without using a microphone of the test station;
and
wherein said measuring, said making the comparison and said computing the calibration value are performed for all of the microphones of the portable audio device in response to the continuously-played calibration sound.

6 more elements

Dependencies are inferred from the claim text.

System and method for calibrating and testing an active noise cancellation (anc) system

Life of this patent

System and method for calibrating and testing an active noise cancellation (anc) system

Life of this patent

Abstract

Claims26