An apparatus for converting between synchronous audio video and control signals and asynchronous data streams for an IP network as interfaces for the audio and video signals and for control signals. A processor is arranged to convert between the synchronous audio video and control signals and asynchronous packaged d...

Video encoding or decoding utilising a spatial transform operating on rows and columns of a block, with a set of o transform skip modes including: transform on rows and columns; transform on rows only;transform on columns only;no transform. An indication of the selected mode is provided to the decoder. Coefficients...

A system for determining the presence of, and information about, a DVB-T2 signal comprises means for providing a symbol with an active portion, providing a repetition portion and frequency shifting the repetition portion with respect to the active portion at a transmitter. At a receiver, the signal is multiplied by ...

A COFDM transmission scheme is provided that offers improved resilience to noise or deleterious effects in the transmission path. The scheme transmits two copies of the data on different symbols or carriers, if one version of the data is lost, the receiver can attempt demodulation of the surviving version. Furthermo...

An OFDM-MIMO radio-frequency transmission system takes the form of a DVB-T system which is modified in that the phases of selected ones of the pilot signal transmissions, particularly the scattered pilots, are chosen or changed at the transmitters such that some of the corresponding pilot signal transmissions from t...

The present invention relates to a method of decoding a video bitstream, the method comprising the steps of: receiving a bitstream representing: residual samples produced by subtracting encoder filtered motion compensated prediction samples from image samples; and motion vectors used in forming the motion compensate...

The present disclosure relates to: a method of decoding, in a decoder, a bitstream representing an image, wherein the bitstream comprises a plurality of blocks of residual samples, and one or more reconstructed image frames of the image are obtained by adding a respective block of residual samples to a combined hypo...

The present invention relates to a method of decoding in a decoder 1 a bitstream representing an image comprising: receiving the bitstream; for each block in the bitstream: forming predictions; and adding a respective prediction to each residual sample to form a reconstructed image sample; providing a reconstructed ...

Signalling of an intra-prediction mode is achieved by indicating whether or not to compile an MPM list, on the basis of a test as to the expectation that the MPM list will bear useful information. If an MPM list is not convenient, then the mode is directly signalled. If the MPM list is to be constructed, then the mo...

Video decoding is implemented using a combined inter-picture merge and intra-picture prediction facility, operable to predict samples of a block of video sample data. The combined inter-picture merge and intra-picture prediction facility is operable in one of a plurality of modes wherein, in at least one of said mod...

An intra-prediction mode is provided for chroma data, in which a neural network implemented attention module directs the encoding of a block of chroma data with respect to luma data for the collocated luma block.

Intra-prediction modes are defined in that, predictions obtained in accordance with those modes are based on a sum of a first component dependent on a set of reference samples and a second component not dependent on the reference samples.

Encoding of video data in a video codec involves a transform of residuals. This can be composed of a primary transform and a secondary transform. The selection of the secondary transform is effected by considering the characteristics of a block to be encoded. The selection of secondary transform can be signalled to ...