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National Semiconductor Corporation (NS) is introducing a new audio product that uses far-field noise suppression technology. Far-field noise suppression technology can reduce output frequency distortion and other audio artifacts, making the transmitted sound more natural and real. In terms of sound effects, the audio system based on digital signal processor or microprocessor with software generally uses sub-band frequency processing algorithm to suppress noise, and its suppression effect is greatly inferior to far-field noise suppression technology.The PowerWise LMV1088 dual-input microphone array amplifier uses National's far-field noise suppression technology to reduce background noise and make transmitted speech clearer, making it ideal for mobile phones, two-way radios, and active headsets. This amplifier comes from National's PowerWise® family of energy-efficient chips that consume very little power (only 1mA) and are only one-tenth the audio system of digital signal processors or microprocessors. This ultra-low power consumption level is now the new standard in the industry.
The LMV1088 amplifier chip can significantly improve the voice signal/background noise ratio of voice communication systems and ensure natural sound quality to enhance customer satisfaction. In addition, increasing the speech signal/background noise ratio also helps to improve the accuracy of the speech recognition system because background noise is not a signal component to be specifically suppressed.
The LMV1088 amplifier chip uses continuous-time analog signal processing to provide real-time response to speech signals and background noise. Both digital signal processors and microprocessors require additional computational time to properly respond to fluctuating speech background noise. In addition, the LMV1088 amplifier chip is very easy to use, and system designers can quickly incorporate this noise suppression function into a mobile phone or active headset without modifying the original design. If a digital signal processor or microprocessor is used, engineers spend a lot of time developing and testing the voice processor code for the processor during the development process.
The LMV1088 is a dual-input microphone array amplifier in a small, micro-SMDxt package of 36-bump, measuring just 3.5mm x 3.5mm. This chip only consumes 1mA of supply current. If the input frequency is 1kHz, its power supply rejection ratio (PSRR) is 85dB, the signal-to-noise ratio (SNR) is 60dB (typ), and total harmonic distortion and noise (with A The weighted THD+N) does not exceed 1%. The LMV1088 amplifier chip is especially suitable for dual microphones that are arranged back to back. The line between the two microphones is approximately 1.5 cm to 2.5 cm, or both maintain an equivalent acoustic path distance. The speaker is preferably kept at a distance of 2 cm to 10 cm from the microphone of the mobile phone or earphone.
The amplifier's built-in auto-calibration circuitry compensates for microphone gain and different frequency response, so customers can more flexibly position the microphone in the product without the need for expensive original microphone accessories. The calibration data is stored in the EEPROM memory built into the LMV1088 chip. The sequential calibration function selects the optimal coefficient for the spatial position and acoustics of the two microphones. The LMV1088 chip has four I2C compatible operating modes to choose from, including a preset low noise mode, a microphone 1 transfer mode, a microphone 2 transfer mode, or a microphone 1 and 2 common transfer mode.
The LMV1088 chip is produced by National Semiconductor's chip factory in South Portland, Maine, USA, and the test and assembly is handled by the company's assembly plant in Malacca, Malaysia.
The LMV1088 chip is available in volume quantities and is priced at $9.95 each in 1,000-unit quantities.
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