Single-chip microphone captures broader range of voice frequencies
CMOS MEMS device heralds better teleconferencing and voice recognition applications for compact portable devices
The AKU2103 CMOS MEMS microphone provides wider bandwidth capability than previous, standard-definition devices, and thus opens the door for high-definition (HD) voice quality in laptops and other broadband mobile devices. The digital device is the first to guarantee compliance with the latest voice-quality requirement for applications such as VoIP.
Like previous AKU devices (see Electronic Products , January 2007, p. 30 http://electronicproducts-com-develop.go-vip.net/ShowPage1.asp?FileName=poyrc02.jan2007.html), the microphone is a CMOS MEMS device with mechanical transducer, output amplifier, and sigma-delta converter integrated on a single silicon chip.
The mic’s HD voice technology lets it capture consonant sounds found above 3,400 Hz and vocal nuances below 250 Hz, improving intelligibility to bring face-to-face-quality voice capture to mobile communications. It can thus meet the TIA-920 specification’s wideband digital audio requirements for telephony apps.
The device typically has an SNR of 57 dB, a PSRR of -70 dB, and current consumption less than 750-µA, or 75 µA with no load. Single-chip construction, digital output, and high PSRR make the IC’s output signal virtually immune to RFI/EMI as well as power-supply modulation. Further, the mic’s digital output will not degrade along the signal path from the mic to codec. ($0.99 ea/1 million samples available Q3.)
Akustica , Pittsburgh , PA
Information 412-390-1730
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