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National intros analog noise-suppression technology

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CIOL Bureau
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HONG KONG: National Semiconductor Corp. announced the first in a line of audio products incorporating far-field noise suppression technology.

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This unique technology delivers more natural-sounding voice quality by eliminating the output frequency distortions and other audio artifacts common with digital signal processor (DSP) or microprocessor software-based systems that use sub-band frequency processing algorithms to implement noise suppression.

The PowerWise LMV1088 dual-input microphone array amplifier, which uses National’s far-field noise suppression technology, reduces background noise and improves voice communication clarity in mobile phones, two-way radios and powered headsets. Part of National’s PowerWise® energy-efficient family, the device consumes one-tenth the power (1 mA) of comparable DSP or microprocessor software-based systems, setting a new standard for low power consumption.

The LMV1088 dramatically improves the talker’s voice-signal-to-background-noise ratio in the communications system while retaining natural speech quality. The improvement directly translates to clearer voice signals on the receiving end of the communications link and an increase in customer satisfaction. Additionally, the voice-signal-to-background-noise improvement allows increased accuracy by voice recognition systems since the background noise is not a significant part of the signal to discriminate against.

The LMV1088’s continuous-time analog processing provides instantaneous response to voice and background noise signals, unlike DSPs and processors which require extra computation time to adjust to voice background noise levels. Additionally, the LMV1088’s ease of use allows the rapid integration of noise suppression performance in phone handsets or powered headsets, without the added development time required to write and test voice-processing programming code for a DSP or microprocessor.

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