Brief description of the diffusion of high definition television programs on channel a narrow band.

摘要

The installation of the diffusion of tv hd according to the standard hd - mac comprises a transmitter supplying a narrow-band channel, having a sampler (14), an encoder (18) in reduction of the passband by a factor of four by under - sampling spatial and temporal - selected from among at least two modes, as a function of the activity of the zones of the image, at least one of the modes of implementing a vertical mixing-up intra - frame causing the appearance of structures to frequencies close to a determined frequency, followed by an encoder mac (20). A digital attenuation module (30) follows the coder (18) and above the encoder mac (20), a spatial filtering intra - line in the frame of the attenuation of the high frequencies of the structures is created by the vertical mixing intra -.