Compatible wide screen television system with image compressor/expander

摘要

A wide aspect ratio television system includes memories for storing and recovering a video input signal in response to read and write clock pulses, respectively. Write clock pulses are deleted to compress edge regions of a wide aspect ratio input signal and read clock pulses are deleted to restore the signal to its original aspect ratio. The pattern of delected pulses is altered on a line-by-line basis to reduce visible artifacts of signal decimation. Dual mode receivers include provisions for controlling edge blanking, interpolation and the pattern of clock pulses deleted as a function of received signals. Wide and standard aspect ratio images are displayed without altering the width of the display raster.