National Semiconductor recently announced the first in a line of audio products incorporating far-field noise suppression technology.
This unique technology delivers more natural-sounding voice quality by eliminating the output frequency distortions and other audio artefacts 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 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 only 1 mA.
The amplifier improves the talker's voice-signal-to-background-noise ratio in the communications system while retaining natural speech quality. Additionally, this allows increased accuracy by voice recognition systems since the background noise is not a significant part of the signal to discriminate against. The 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.
The LMV1088 is offered in a miniature 3,5 x 3,5 mm, 36-bump micro SMDxt package, with a power supply rejection ratio (PSRR) of 85 dB at 1 kHz, with a typical signal-to-noise ratio of 60 dB and less than 1% total harmonic distortion plus noise (A-weighted THD+N). It is designed for use with two microphones in an end-fire array configuration. The microphones can be spaced in a line 1,5 cm to 2,5 cm apart from each other, or the equivalent acoustic path distance. The optimal distance for the person speaking into the handset or headset microphone is 2 cm to 10 cm.
The amplifier's automatic calibration circuitry compensates for the microphone's gain and frequency response variations, eliminating the need to use expensive matched microphone sets, while allowing flexible placement of the microphones in the final product. The calibration data is stored in the LMV1088's internal EEPROM memory, and the calibration sequence chooses the optimised coefficients for the two microphones' spacing and acoustical environment. The chip features four I²C compatible, selectable operating modes: default noise reduction, microphone 1 pass-through, microphone 2 pass-through, and microphone 1 and 2 sum.
Compact direct Time-of-Flight 3D LiDAR module Altron Arrow
Opto-Electronics Electronics Technology AI & ML
The VL53L9 from STMicroelectronics is the first direct Time-of-Flight (dToF) 3D LiDAR all-in-one module in ST’s portfolio, offering a resolution of 2,3K zones, wide field of view, on-chip processing, 100 frames per second, and sensing range from 5 centimeters to 9 meters.
Read more...Digital isolators for I2C interfaces
Analogue, Mixed Signal, LSI
Würth Elektronik has expanded its range of digital isolators with 2-channel bidirectional isolators for I2C communication interfaces.
Read more...Generating negative voltages from a positive supply Altron Arrow
Editor's Choice Passive Components
It is common for IoT devices, industrial sensors, meters, and medical equipment to require both a positive and negative voltage, and this article explains the options available to produce a negative rail from a positive rail supply.
Read more...Addressing latency and signal integrity challenges Altron Arrow
DSP, Micros & Memory
Strengthening Microchip Technology’s data centre solutions portfolio, its XpressConnect retimers support high-bandwidth architectures, while helping reduce integration complexity.
Read more...Precision timing in compact package Altron Arrow
Telecoms, Datacoms, Wireless, IoT
Designed for use in harsh environments, the EX-423 incorporates a four-point mounted quartz crystal structure that improves shock resistance and reduces g-sensitivity.
Read more...EMC limits and levels Altron Arrow
Editor's Choice Circuit & System Protection
As soon as electronics and electrical systems started interfering with each other, the world had to come to some consensus. Considering physics is universal and does not care about what country electrical/electronic products are used in, it should be the same everywhere, right? It is nearly there, but not quite.
Read more...Introducing STM32CubeMX2 Altron Arrow
Design Automation
STMicroelectronics has launched STM32CubeMX2, a new evolution of its popular configuration and code generation tool for STM32 microcontrollers.
Read more...Next-gen SPE Altron Arrow
Telecoms, Datacoms, Wireless, IoT
Next-generation 100/1000BASE-T1 Single Pair Ethernet PHYs integrate MACsec security, time sensitive networking, and functional safety.
Read more...Ultra-low-power smart metering EBV Electrolink
Analogue, Mixed Signal, LSI
ScioSense’s UFC23 sensor combines improved resolution and offset stability with ultra-low standby current, enabling high-end battery-powered water, heat, gas and leak detection meter designs.
Read more...Industrial vibration sensing simplified Altron Arrow
Analogue, Mixed Signal, LSI
The IIS3DWBG1 from STMicroelectronics is a high performance, three-axis digital vibration sensor engineered for demanding industrial applications where accurate motion monitoring is essential.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version