DOUBLE SCANNING PICTORE SIGNAL PROCESSING CIRCUIT FOR TELEVISION

The circuit for improving the image sharpness includes a multiplexer (1) receiving the digital image signal corresponding to vertical scanning line, memories (2,3) storing the output of the multiplexer alternatively by the write pulse (PW), an interpolation memory (4) storing the data from the memories (2,3) alternatively and providing them to an adder (7) adding them in parallel, and a shift register (8) providing the right-shifted and half-divided signal. The contents in the memories (2,3) are read/write alternatively with double speed such that the one vertical scanning signal is interpolated in the interpolation memory (4), then the circuit provides double scanning signal to the CRT.