Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
?
EE Times-Asia > Sensors/MEMS
?
?
Sensors/MEMS??

Low-power mobile sound system has noise suppression

Posted: 30 Jul 2010 ?? ?Print Version ?Bookmark and Share

Keywords:analog audio? mobile phones? noise suppression?

National Semiconductor has announced the LM49155 analog audio subsystem with integrated noise reduction for mobile phones and other portable handheld applications. Designed to maintain voice quality in noisy environments while using minimum power consumption, the device enables the rapid integration of noise suppression performance in phone handsets.

The device combines a noise suppression microphone amplifier, a 1.35-W mono class-D amplifier with ALC, a class-AB earpiece driver with AGC, a high-efficiency, stereo, ground-referenced headphone amplifier with click/pop suppression and I2C mode select and volume control. Quiescent current consumption is 3.7 mA for the earpiece amplifier and microphone amplifier signal path.

The LM49155's uplink noise suppression technology rejects far-field noise at 34 dB at 1kHz through a two-microphone amplifier implementation. Downlink voice intelligibility is improved by enhancing the SNR (by 16 dB typ) between the handset's earpiece signal level and the ambient noise level.

The LM49155 is packaged in a 36-bump micro SMD package measuring 3.4mm x 3.4mm. Pricing is $2.25 each in 1,000-unit quantities.

- Rich Pell
EE Times





Article Comments - Low-power mobile sound system has no...
Comments:??
*? You can enter [0] more charecters.
*Verify code:
?
?
Webinars

Seminars

Visit Asia Webinars to learn about the latest in technology and get practical design tips.

?
?
Back to Top