CLICK AND POP NOISE REDUCTION IN HEADPHONES

摘要

A method and an apparatus are provided. The apparatus reduces noise in headphones due to a change in a current or a voltage in headphones while determining an impedance of the headphones. The apparatus generates a digital waveform that reduces noise in the headphones when applied for an impedance determination. The apparatus converts the digital waveform to an analog waveform. The apparatus applies the analog waveform to an input of the headphones while reducing the noise in the headphones due to the application of the analog waveform for the impedance determination. The apparatus determines the impedance of the headphones based on the applied analog waveform. A first derivative of the analog waveform may be continuous. In particular, the analog waveform may be “s” shaped. The digital waveform may be generated based on a ramp digital waveform. The ramp digital waveform may be generated based on a step digital waveform.

主权项

1. A method of reducing noise in headphones due to a change in a current or a voltage in the headphones while determining an impedance of the headphones, comprising:
generating a digital waveform that reduces noise in the headphones when applied for an impedance determination; converting the digital waveform to an analog waveform; applying the analog waveform to an input of the headphones while reducing the noise in the headphones due to the application of the analog waveform for the impedance determination; and determining the impedance of the headphones based on the applied analog waveform.