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Analog noise cancellation shines in speaker driver IC

Analog noise cancellation shines in speaker driver IC

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By eeNews Europe



The headset for the Ascend Mate 7 Android smartphone from Huawei includes automatic noise cancellation from an analog speaker driver IC provided by analog, mixed-signal and sensor chip company AMS AG.

The headset’s ANC feature, combined with the passive noise reduction provided by the in-ear housings surrounding the speakers, attenuates a large proportion of ambient noise from low frequencies up to around 3kHz, AMS said.

The AS3415, a feed-forward ANC speaker driver IC, uses only analog circuitry for rather than implementing the ANC in a digital signal processor. This uses less than half the power of digital ANC systems. It also saves space in the headset, because all the features necessary for noise cancellation are integrated into the AS3415’s circuitry, with very few, small external components required.

The AS3415 produces typical total harmonic distortion of just 0.004 percent, and offers a signal-to-noise ratio of greater than 110dB (34mW output into a 32-ohm load). Typical active noise attenuation achieved by the AS3415 is 95 percent.

An evaluation kit for the AS3415 ANC speaker driver is available online from AMS.

Related links and articles:

www.ams.com

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