DIGITAL CONVERGENCE CORRECTING DEVICE

• Main Authors: OOSAWA MICHITAKA, FUNADA ETSUO
• Format: Patent
• Language: English
• Published: 31.01.1985
• Edition: 4
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PURPOSE:To attain the saving of capacity of a frame memory without using an interpolation operating circuit by interpolating a correcting amount between vertical adjusting points by a low pass filter. CONSTITUTION:An address in response to raster scanning is given from an address counter 1 to a frame memory 2. The frame memory 2 is a memory storing only the correcting amount data at (mXn)-set of adjusting points. The correction amount data of each adjusting point read from the memory 2 is converted into an analog quantity by a D/A converter 3 in response to the raster scanning and inputted to a sample holding circuit 8. The low pass filter 11 receiving the output of the circuit 8 interpolates the correcting amount between vertical adjusting points in each of m-set horizontal adjusting points and gives an output. The output of a low pass filter LPFi is selected and outputted from this output by an analog multiplexer 9 at the i-th adjusting point in the horizontal direction and the correcting amount between the adjusting points in the horizontal direction is interpolated by giving the output to the next low pass filter 4.