The AS3412 is a speaker driver with Ambient Noise Cancelling
function for headsets, headphones or ear pieces. They are
intended to improve quality of e.g. music listening, a phone
conversation etc. by reducing background ambient noise.
The fully analog implementation allows the lowest power
consumption, lowest system BOM cost and most natural
received voice enhancement otherwise difficult to achieve with
DSP implementations. The device is designed to be easily
applied to existing architectures.
An internal OTP-ROM can be optionally used to store the
microphones gain calibration settings. The AS3412 can be used
in different configurations for best trade-off in terms of noise
cancellation, required filtering functions and mechanical
designs. The AS3412 targeting feed-forward topology is used
to effectively reduce frequencies typically up to 2-3 kHz.
The filter loop for the system is determined by measurements,
for each specific headset individually, and depends very much
on mechanical designs. The gain and phase compensation filter
network is implemented with cheap resistors and capacitors for
lowest system costs.
General Description
The AS3412 is a speaker driver with Ambient Noise Cancelling
function for headsets, headphones or ear pieces. They are
intended to improve quality of e.g. music listening, a phone
conversation etc. by reducing background ambient noise.
The fully analog implementation allows the lowest power
consumption, lowest system BOM cost and most natural
received voice enhancement otherwise difficult to achieve with
DSP implementations. The device is designed to be easily
applied to existing architectures.
An internal OTP-ROM can be optionally used to store the
microphones gain calibration settings. The AS3412 can be used
in different configurations for best trade-off in terms of noise
cancellation, required filtering functions and mechanical
designs. The AS3412 targeting feed-forward topology is used
to effectively reduce frequencies typically up to 2-3 kHz.
The filter loop for the system is determined by measurements,
for each specific headset individually, and depends very much
on mechanical designs. The gain and phase compensation filter
network is implemented with cheap resistors and capacitors for
lowest system costs.
Applications
The devices are ideal for Ear Pieces, Headsets, Hands-Free Kits,
Mobile Phones, and Voice Communicating Devices.