MEMS microphones target high-fidelity audio playback
April 23, 2010 // Julien Happich
Analog Devices has created two new MEMS microphones that enable advanced audio functions for portable electronics. These functions include high-fidelity audio/video playback, hands free communication, and voice recognition with built-in wind noise suppression, and TIA-920-compliance for VoIP applications.
The ADMP 404 and ADMP405 iMEMS microphones combine ADI's audio signal processing expertise with its innovative patented and patent-pending iMEMS technology.
The resulting MEMS microphones offer the industry's highest SNR (signal-to-noise ratio) of 62 dB A-weighted and the highest PSRR (power supply rejection ratio) of 70 dBV with integrated high-pass filtering, claims the manufacturer. End-product manufacturers can now develop portable electronic devices that deliver clearer, more intelligible voice quality without the background noise/hiss produced by other microphones with lower SNR.
Delivering a flat wideband frequency response from 100Hz to 15kHz on the ADMP404 and from 200Hz to 15kHz on the ADMP405, these MEMS microphones eliminate the need for hardware filtering or advanced signal processing to enhance audio acquisition.
The ADMP405 with a 200 Hz roll-off is the industry's first with this capability, enabling engineers to filter wind noise or fan noise energy at the transducer; this provides a clearer audio signal that can be more easily conditioned with any downstream signal processing. Engineers can now move beyond simple command and control voice recognition to full voice recognition for hands-free, translator, and dictation applications.
The ADMP404 is a high quality, low cost, low power, analog output bottom-ported omnidirectional MEMS microphone. The ADMP404 consists of a MEMS microphone element, an impedance converter, and an output amplifier. The ADMP404 sensitivity of -38 dBV makes it an excellent choice for both near-field and far-field applications.
The ADMP404 has a high SNR of 62 dB A-weighted and flat, wideband frequency response from 100 Hz to 15 kHz, resulting in natural sound with high intelligibility. Low power consumption enables long battery life for portable applications. A built-in particle filter provides high reliability.
Cadence breaks into top four in semi IP core ranking
April 23, 2014
Cadence Design Systems Inc. moved into the top four of semiconductor IP core suppliers in 2013 spurred by its renewed IP ...
Get your IT infrastructure assessed for free
Custom processor tool wins $2.8m backing
Mixture of graphene/carbon nanotubes produce low-cost ultracapacitors
OLEDs help NASA focus space biology research
Display Stream Compression standard boosts display interfaces to 8K
April 23, 2014
The Video Electronics Standards Association (VESA), working in liaison with the MIPI Alliance, has unveiled the Display Stream ...
Hard wired floating point changes FPGA
Printoo: printed electronics made Arduino-compatible
Magnetic RAM set for 50% CAGR, says report
- USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
- Measurement applications across multiple test platforms
- Supplying DC input power to string inverters
- Supplying DC input power for HEV testing
InterviewHeartbleed challenges the Internet of Thing
The Heartbleed security bug is a key example of the fundamental security challenge for the Internet of Things says Green Hills Software as it launches a new security group.
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Arrow Electronics is giving away ten XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.
Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.