Quadruplex encoding for actv

Details Quadruplex encoding for actv Quadruplex encoding for actv

H - Electricity

04

N

350/34

H04N 11/06 (2006.01) H04N 11/24 (2006.01)

Patent

CA 2002636

RCA 85395 QUADRUPLEX ENCODING FOR ACTV ABSTRACT OF THE DISCLOSURE By employing different independent polarity codes to polarity-modulate respective quads of averaged values in the vertical-temporal plane of luma, chroma, sidepanel and enhanced- luma components in the mid-frequency and/or high-frequency split-bands of a 4.2 MHz baseband television-type signal, the encoded components can be combined into successive composite quads of an encoded single channel, NTSC compatible, enhanced- definition 4.2 Mhz bandwidth television signal. The successive composite quads of the encoded signal can be decoded by a widescreen receiver without crosstalk taking place among the components, while such an encoded signal does not noticeably affect the display of a standard NTSC receiver.

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