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
Li-Fi communication module wirelessly transfers data at 1-Gbps
October 31, 2014
The Fraunhofer Institute for Photonic Microsystems IPMS in Dresden has developed communication modules that can wirelessly ...
Digital Lumens raises USD23m for intelligent LED lighting solution
Bosch brings electronic fuel system, connectivity to Asian motorbikes
NXP extends NFC ecosystem to the car
Japan's MegaChips to buy MEMS maker SiTime
Freescale CEO: 'IoT isn't just buzz'
October 30, 2014
Coming after the solid third quarter results that produced higher operating margins and improving cash flow, Freescale Semiconductor's ...
3D prints world's best inverter
Research project significantly improves electronics reliability
Netscout Acquires Communications Businesses From Danaher
- Wireless Power User Guide
- Secure is the New Smart
- 5 Best Practices for Designing Flexible Test Stations
- Intelligent PLCs Expand the Internet of Things
InterviewFreescale CEO: 'IoT isn't just buzz'
Coming after the solid third quarter results that produced higher operating margins and improving cash flow, Freescale Semiconductor's CEO Gregg Lowe had every reason to be chipper and lively when EE Times ...
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, Oscium is giving away three of its iMSO-204L dual analogue iOS oscilloscopes, worth USD400 each. Designed with native Lightning compatibility, the iMSO-204L transforms the iPad, iPhone, and iPod touch into an ultra-portable, two-channel oscilloscope.
Since Apple changed its connector, Oscium has been working to bring native compatibility to its customers. The third generation...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.