Noise cancellation IC has on-chip calibration
Austriamicrosystems has two active noise cancelling (ANC) ICs which are aimed at improving speech and music clarity in mobile phone headphones.
They work by reducing low frequency noise in the signal path.
The AS3410 and AS3430 devices are claimed to achieve greater than 20dB noise reduction with a signal-to-noise ratio (SNR) of greater than 100dB and THD of 0.1%.
According to Oliver Jones, austriamicrosystems’ marketing manager for audio products, the chips can simplify the “production process for headsets due to the integrated calibration feature and reprogrammability”.
For low power operation the chips run off a single AAA battery with an operating life of more than 100 hours.
The AS3410 has feed-forward topology for on-ear and in-ear devices. The AS3430 is a higher specified device for feedback topologies.
Both devices include; mic pre-amps, filter op amps, true ground headphone amp, mic gain calibration, LED driver, volume control and an assisted hearing mode.
The AS3410 is available in a 24-pin 4×4 mm QFN package.
Experience how Active Noise Cancelling reduces unwanted environmental noise to enhance the clarity of sound with our ANC Demo.