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Voice echo cancellers offer high density, low power

Posted: 03 Sep 2002 ?? ?Print Version ?Bookmark and Share

Keywords:Zarlink semiconductor? zl50232? zl50212? zl50211? voice echo canceller?

Zarlink Semiconductor has introduced 288- and 256-channel voice echo cancellation (VEC) ICs for use in VoIP gateways; VoFR, VoA, and VoDSL access equipment; T1/E1 echo cancellation pools; and wireless basestations.

The chips are said to provide eight times the density of competing devices but consumes 80 percent less power. They are priced at about $1 per channel, or about 50 percent below competing devices.

For lower-density applications, the firm also introduced a 32-channel VEC chip, the ZL50232, priced at $48.44 in 10k quantities.

"Together with our 128-channel MT93L04, our 288- and 256-channel VECs can process a full DS3 interface operating at 44Mbps. In contrast, at least 23 VECs from other vendors would be needed to process a DS3 link," Mukherjee said.

The 288-channel ZL50212, priced at $286.49 in 10k quantities, contains 144 groups of dual echo cancellers (ECA and ECB) that can be configured to provide two channels of 64ms echo cancellation (288 channels total), one channel of 128ms (144 channels), or combinations of the two configurations. It supports ITU-T G.165 and G.164 tone disable requirements.

Supporting the same tone disable requirements, the 256-channel ZL50211, priced at $254.66, contains 128 groups of two echo cancellers that can be configured to provide two 64ms channels, one 128ms channel, or combinations.

The 32-channel ZL50232, for use in PBXs, wireless basestations, and interactive voice response systems, can be configured to offer 32 channels of echo cancellation at 64ms, 16 channels at 128ms, or other combinations.

The ZL50212 and ZL50211 are each offered in a 535-pin BGA package. The ZL50232 is available in 100-pin LQFP or 208-pin LBGA packages.

EE Times

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