A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the mic...

A gain control system for controlling gain applied to an audio signal, the system comprising: a power estimator configured to estimate the power of a digital signal derived from the audio signal; a digital gain estimator configured to determine, in dependence on the estimated power, a digital gain which would modify...

A threshold control system for controlling a non-linear processor in an echo canceller, the non-linear processor being configured to remove any signal energy below a threshold that remains in a microphone signal after the echo canceller has subtracted an echo estimate from it, the threshold control system comprising...

A method of transmitting a media stream over a network, the method comprising: maintaining a measure of network quality indicative of available bandwidth over the network; using the measure of network quality to detect a reduction in network quality indicative of a reduced available bandwidth and, responsive to dete...

A tessellation method is described which uses tessellation factors defined for each vertex of a patch which may be a quad, a triangle or an isoline. The method is implemented in a computer graphics system and involves comparing the vertex tessellation factors to a threshold. If the vertex tessellation factors for ei...

A tessellation method is described which uses both vertex tessellation factors and displacement factors defined for each vertex of a patch which may be a quad, a triangle or an isoline. The method is implemented in a computer graphics system and involves calculating a vertex tessellation factor for each corner verte...

A system for generating comfort noise for a stream of frames carrying an audio signal, the system comprising: a frame characteriser configured to generate a set of filter parameters characterising the frequency content of a frame; an analysis filter adapted using the filter parameters and configured to filter the fr...

A gain control system for applying gain to a far-end signal, the system comprising: a signal identifier configured to detect an echo of the far-end signal in a microphone signal; and a path estimator configured to estimate a characteristic of an echo path of the detected echo, wherein: the signal identifier is furth...

A method of transmitting data in a media stream, the media stream being in accordance with a media streaming protocol, the method comprising: generating data of a first type, the first type being associated with a first type identifier in accordance with the protocol; encapsulating the generated data in a data struc...

Apparatuses, methods and systems for beamforming are disclosed. One embodiment of a method includes generating a beamforming matrix, including obtaining a channel matrix of a multiple-input, multiple-output (MIMO) between a multiple antenna transmitter and a receiver, determining an initial beamforming matrix based ...

A tessellation method is described which uses vertex tessellation factors. For a quad patch, the method involves comparing the vertex tessellation factors for each vertex of the quad patch to a threshold value and if none exceed the threshold, the quad is sub-divided into two or four triangles. If at least one of th...