AMS AS3421/AS3422 speaker driver IC range

AMS has introduced the AS3421 and AS3422, with integrated speaker driver ICs which make it easier for manufacturers of Bluetooth headsets, headphones and earpieces to implement active noise cancellation.

Wireless headsets, which may be linked over the air to devices such as mobile phones and portable media players, are often used in noisy environments such as cars, aircraft, office buildings and public places.

ANC reduces the perceived volume of external noise, enabling the desired receive-path audio signal to be heard against a nearly silent background. Headset users can therefore: hear speech more clearly on voice calls and benefit from improved intelligibility; enjoy the full dynamic and frequency range of reproduced music at a comfortable playback volume; concentrate for longer and benefit from a less tiring and stressful listening experience.

Single-chip ANC solutions with integrated speaker driver ICs process external noise sensed by a microphone embedded in the headset and generate a noise-cancelling signal, while amplifying the desired audio signal with very low levels of distortion.