Method and system for broadcasting high definition television programmes.

摘要

Process and system for broadcasting a high-definition television programme on a channel with capacity below the signal band. The process includes: at the transmission stage, a pseudo-selection of the image dividing the spatial information over n successive frames (n being an integer over 1) and a temporal filter turning down the energy level in the region around f0/n (f0 being the analysis frame frequency) after high-definition coding and before transmission; and at the receiving stage, an interpolation filter and a temporal filter for accentuation corresponding to how far the energy had been turned down before high-definition decoding. The degree of temporal attenuation is adaptable to local spatial activity.