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In the US, the FCC mandates HAC for smartphones. The tool includes a special calibration mode that reduces magnetic interference (T-coil) by adjusting the PWM (Pulse Width Modulation) frequencies of the audio amplifier.
At the heart of the audio chain for millions of Android devices lies the Qualcomm Audio Calibration Tool (QACT). It is the bridge between the raw physics of a speaker driver and the polished, high-fidelity sound the consumer expects. qualcomm audio calibration tool