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A single-chip CMOS analog/digital mixed NTSC decoder

1990; Institute of Electrical and Electronics Engineers; Volume: 25; Issue: 6 Linguagem: Inglês

10.1109/4.62181

1558-173X

M. Ohta, K. Kohiyama, N. Tahara, K. Sugihara, F. Asami, Osamu Kobayashi, Y. Hino, T. Akiba,

CCD and CMOS Imaging Sensors

A single-chip CMOS LSI that integrates all analog-to-digital (A/D), digital-to-analog (D/A), peripheral, and digital signal processing circuits necessary for a digital National Television System Committee (NTSC) signal decoder is described. The LSI chip accepts composite NTSC video signals in analog form, digitizes them using the on-chip A/D converter, converts them to component RGB signals, and then converts the signals to analog form by using the on-chip D/A converters. The development of circuits that maximize use of the input digital data is discussed. A 6-b A/D circuit is used to reduce the circuit size. Circuits that help maintain acceptable picture quality despite 6-b resolution were developed. Besides analog NTSC signal input and RGB signal output, the IC can also input and output digital NTSC signals, Y/C (luminance, chrominance) signals, and RGB signals. Applications of the LSI are presented. >