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Acoustic echo canceller preserves sound

Ottawa, Canada — Zarlink Semiconductor unveiled its latest acoustic echo canceller that is said to improve voice quality and reduce noise in a wide range of hands-free communication applications, including car kits, desktop phones and intercom systems.

The ZL38003 acoustic echo canceller (AEC) builds on a field-proven algorithm designed to track and reduce background noise and preserve voice quality in high-noise environments, said Andre Coucopoulos, Zarlink's marketing manager of voice processing. The chip offers hands-free equipment designers an integrated solution that reduces design complexity, component costs and board space requirements, he said.

The AEC's integrated features, including codecs, programmable gain pads and a four-port cross-point switch, eliminate the need for many external components, according to Coucopoulos.

The 127-ms acoustic echo canceller provides up to 12 dB of noise reduction and handles up to -6 dB acoustic echo return loss.

When used in a desktop phone design, the integrated four-port cross-point switch allows the analog signal to be directed to any of the four ports which can be connected to a headset, speaker, ringer and audio jacks.

The programmable gain feature allows the user to adjust a wide range of transducer sensitivities, with two microphone amplifiers and four earpiece amplifiers enabling connection to a handset, headset, auxiliary channel and microphone/speaker. Programmable noise reduction allows the user to adjust the noise reduction level to meet system requirements without distorting the audio signal, Coucopoulos said.

The ZL38003 also touts anti-howling detection that identifies instability in the audio path and automatically avoids oscillation.

 
 
See related block diagram

The ZL38003 is now available in an 81-ball CABGA package measuring 10 x 10 mm. Zarlink declined to give pricing on the device.Click here for the ZL38003 data sheet.

Zarlink , 1-613-592-0200, www.Zarlink.com.

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