Noise-cancelling IC offers OEMs better audio quality in wireless headsets
June 20, 2012 // Paul Buckley
ams has introduced the AS3421 and AS3422, single chip ANC solutions with integrated speaker driver ICs, which make it easier for manufacturers of Bluetooth headsets, headphones and earpieces to implement Active Noise Cancellation (ANC).
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.
With the introduction of the AS3421/22, ams has delivered an ANC solution optimized for use in wireless headsets, many of which use Bluetooth to provide an RF channel between the host device and the headset.
Low power consumption and long battery life are particularly important requirements in wireless headsets, and the all-analog design of the AS3421/22 is more efficient than DSP-based (digital) speaker driver ICs. The devices draw just 7 mA at 1.5 V in stereo ANC mode, and <1µA in quiescent mode. They also implement an ultra-low power ANC-bypass mode when the user selects the playback-only function.
In addition, the AS3421/22 devices offer fully differential stereo line inputs to match the differential line outputs from typical Bluetooth-based headset systems-on-chip, combining outstanding audio quality with high performance noise reduction of typically more than 25dB.
The AS3421 is housed in a 4 mm x 4 mm QFN24 package while the AS3422 uses a 5 mmx 5 mm QFN32 package.
Availability and Pricing
Sampling now, the price for the AS3421 ANC speaker driver IC is $2.15 in 1000-piece quantities; the price for the AS3422 is $2.70.
Evaluation kits for the AS3421 and AS3422 ANC speaker driver ICs are available.
More information about the AS4321 or AS3422 at www.ams.com/anc
BBC to give pocket-sized sensor-computer to UK children
July 07, 2015
The BBC, the UK's national broadcaster, plans to provide every 11-year old child in the country with a free pocket computer ...
Thin film solar cells may rival silicon
3D printing for photonics: a British initiative
It's crunch time (again) for EUV lithography
Digi-Key to distribute Monolithic Power Systems worldwide
Autonomous taxis would be green and cost effective says study
July 06, 2015
A new study from Lawrence Berkeley National Laboratory (Berkeley Lab) finds that autonomous cars deployed as taxis would ...
What she sees is what you get
Prototyping in silicon photonics boosted by European collaboration
Private equity makes moves on GaN startup
- Critical Requirements in High Speed Signal Generation Applications
- The 400XAC Series: Two Major Advantages that Simplify Functional Testing
- A Smart Way to Drive ECU Consolidation
- Autonomous Driving: An Eye on the Road Ahead
InterviewCEO interview: Cadence is about enablement, collaboration
EDA companies are being asked to provide expertise from the circuit- to the system-level observes Lip-Bu Tan, CEO of EDA software vendor Cadence Design Systems Inc. Covering such a breadth of endeavour ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.