National Semiconductor has introduced an analog audio subsystem with integrated noise reduction. The PowerWise LM49155 improves the talker’s voice-signal-to-background-noise ratio while retaining natural speech quality. The IC also enables increased accuracy of voice recognition systems by minimising background noise. The LM49155 provides uplink noise suppression and downlink signal-to-noise ratio enhancement in a 36-bump micro SMD package measuring 3,4 by 3,4 mm. The subsystem includes a high-efficiency, 1,35 W Class D speaker driver with automatic level control (ALC), ground-referenced headphone amplifier with click-pop suppression, and mixing and volume control. National’s latest noise suppression technology is also available in a discrete noise processing IC, the LMV1099.
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