Echo canceller delivers best-in-class voice quality

8 November 2000 Telecoms, Datacoms, Wireless, IoT

Mitel Semiconductor has released a voice echo canceller that meets the latest ITU-T G.168 requirements for voice quality in converged telecommunications networks. The MT9300B is a 32-channel device that uses an advanced algorithm to remove echoes in telecommunicatins networks. This ensures clear and reliable delivery of voice and data in applications such as Voice over Internet Protocol (VolP) network gateways, Voice Telephony over ATM (VtoA), Voice over Frame Relay (VoFR), T1/E1 multichannel echo cancellation pools, and wireless basestations.

The MT9300B has 32 echo cancellers divided into 16 groups of two each, which can be configured in normal, extended delay or back-to-back organisations. Each group is individually controllable to provide either two channels at 64 ms or one channel at 128 ms. This allows service providers to address several customers with the same device by programming appropriate echo tails at different price/performance points.

Power consumption is minimised, as the device required only 3,3 V inputs, and is equipped with power management capability that allows individual groups of echo cancellers to be powered down when not in use.

The ITU-T recently added new requirements to the G.168 specification to elevate QoS in multiservice networks. The MT9300B complies with this enhanced specification, using a state-of-the-art algorithm to remove residual echoes, and also to inject comfort noise that masks audible switching effects caused when background noise is eliminated, resulting in superior voice quality.

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