H04N7/171 - CPC Classification Index

ClassID:

229871 ⎘

H04N7/171 - CPC Classification

Classification description:

Television systems; Analogue secrecy systems; Analogue subscription systems; Systems rendering the television signal unintelligible and subsequently intelligible Systems operating in the amplitude domain of the television signal

Sub-classes:

H04N7/1713 » {by modifying synchronisation signals} 7
H04N7/1716 » {by inverting the polarity of active picture signal portions} 2

Recent Application in this class:

20110194689

2011-08-11

Encrypted signal detection circuit and video device using the same

20100021133

2010-01-28

METHOD FOR COPY PROTECTION FOR VIDEO SIGNAL WITH ADDED PULSES

20080025696

2008-01-31

VIDEO COPY PROTECTION PROCESS ENHANCEMENT TO INTRODUCE HORIZONTAL AND VERTICAL PICTURE DISTORTIONS

20070211899

2007-09-13

Copy protection for video signal using narrowed horizontal synchronization signals

20070211898

2007-09-13

Copy protection for video signal using added negative amplitude pulse

20070206794

2007-09-06

Copy protection for video signal added pulses

20060045266

2006-03-02

Copy protection for video signal using narrowed horizontal synchronization signals and amplitude modulation