Dual-input mic amp with farfield noise suppression is industry’s first

Dual-input mic amp with farfield noise suppression is industry’s first

Analog part reduces background noise, delivers more natural-sounding voice quality, and consumes 1/10 the power of DSP solutions

The PowerWise LMV1088 dual-input microphone array amplifier, which uses National’s farfield noise suppression technology, reduces background noise and improves voice communication clarity in mobile phones, two-way radios, and powered headsets. The device consumes one-tenth the power (1 mA) of comparable DSP or microprocessor software-based systems (which require extra computation time to adjust to voice background noise levels)setting a new standard for low power consumption.

The voice-signal-to-background-noise improvement allows increased accuracy by voice recognition systems. It has a PSRR of 85 dB at 1 kHz, with a typical SNR of 60 dB and less than 1% THD+N. Housed in a 36-bump micro SMDxt package, the amplifier also features on-chip calibration circuitry, EEPROM, and four I2 C-compatible selectable operating modes: default noise reduction, microphone 1 pass through, microphone 2 pass through, or microphone 1 and 2 sum.

The LMV1088 is designed for use with two microphones in an end-fire array configuration. The microphones can be spaced in a line 1.5 to 2.5 cm apart or the equivalent acoustic path distance. The optimal distance for the person speaking into the handset or headset microphone is 2 to 10 cm. ($9.95 ea/1,000available now.)

National Semiconductor , Santa Clara , CA
Sales 800-272-9959

http://www.national.com