Mitel Networks Corporation

Zarlink Semiconductor Limited

Roger Bastin

Logendra Naidoo

Dieter Schulz

Mirjana Popovic

Andrew Wu

A communication system with a noise cancellation (NC) assembly providing adaptive or dynamic noise cancellation. The NC assembly includes a localizer module determining, during a communication session (active speaking or during idle times), a location of the active talker. The NC assembly includes a beam generator forming a beam in the determined direction of the active talker to enhance the active talker speech. Once the NC assembly has determined the position of the active talker, the NC assembly assigns a microphone of the microphone array or generated beam in that active direction to be the 'active signal' source. The NC assembly assigns a second microphone or beam to be the noise source for NC purposes, and this source may be selected to be in acoustic shadow of the first microphone used as the active signal source or may be the farthest away in its position from the active talker's position.

Adaptive noise cancelling for conferencing communication systems

A method of compensating within a receiving endpoint for lost audio packets transmitted across an IP network, comprising the steps of storing a packet buffer of samples as a plurality of sub packets within a jitter buffer, inserting at least one interpolated sub packet between successive sub packets in the buffer, and playing out the sub packets from the buffer, such that only small portions of the jitter buffer are replayed at specific times to minimize the negative effects on voice quality. The inventive method inserts the replayed portions to compensate for packet loss in a way that results in only a relatively low processing burden.

Sub-packet insertion for packet loss compensation in voice over IP networks

A method of compressing audio data comprising the steps of receiving a stream of digital audio samples; masking a predetermined number of lower order bits from each one of the samples; and shifting an identical number of higher order bits from an adjacent one of the digital audio samples into the respective samples so as to occupy bit locations of the lower order bits which have been masked.

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Carp, Canada

Roger Bastin