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Zarlink Semiconductor’s latest voice echo cancellers use patented NLP (non-linear processing) software for improved noise-matching.


Zarlink Semiconductor’s latest voice echo cancellers use patented NLP (non-linear processing) software for improved noise-matching.
The software’s algorithm injects onto the line spectrally matched “comfort noise” that is adjusted to match caller background noise and eliminate noise gating when echoes are cancelled.

 

As a result the ZL38065 and ZL38070 echo cancellers can handle intense background noise.

 

The ZL38070 can be configured to offer 256 channels of echo cancellation at 64ms, 128 channels at 128ms, or other combinations of channel density and echo delay. The lower density device can be configured to offer 32 channels of echo cancellation at 64ms, 16 channels at 128ms, or other combinations of channel density and echo delay.

 

Power consumption is 4.68mW per channel.

 

The 32-channel ZL38065 device is packaged in a 100-pin LQFP (low-profile quad flat pack) or 208-ball LBGA (low-pitch ball grid array). The 256-channel ZL38070 chip is packaged in a 535-ball PBGA (plastic ball grid array).

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