using demagnetisation or compensation of external magnetic fields [2,4]
9
/
30
•
•
using solid-state colour display devices [4]
9
/
31
•
•
Projection devices for colour picture display [2,4]
9
/
43
•
Conversion of monochrome picture signals to colour picture signals for colour picture display [4]
9
/
44
•
Colour synchronisation [4]
9
/
45
•
•
Generation or recovery of colour sub-carriers [4]
9
/
455
•
•
Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals (H 04 N 9/45 takes precedence) [4]
9
/
465
•
•
Synchronisation of the PAL-switch [4]
9
/
47
•
•
for sequential signals [2,4]
9
/
475
•
•
for mutually locking different synchronisation sources [4]
9
/
64
•
Circuits for processing colour signals (H 04 N 9/77 takes precedence) [4]
9
/
65
•
•
for synchronous modulators [4]
9
/
66
•
•
for synchronous demodulators [4]
9
/
67
•
•
for matrixing [4]
9
/
68
•
•
for controlling the amplitude of colour signals, e.g. automatic chroma control circuits (H 04 N 9/71, H 04 N 9/73 take precedence) [4]
9
/
69
•
•
•
for modifying the colour signals by gamma correction [4]
9
/
70
•
•
for colour killing [4]
9
/
71
•
•
•
combined with colour gain control [4]
9
/
72
•
•
for reinsertion of dc and slowly varying components of colour signals [4]
9
/
73
•
•
colour balance circuits, e.g. white balance circuits, colour temperature control [4]
for mixing of colour signals (H 04 N 9/75 takes precedence) [4]
9
/
77
•
Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase (circuits for matrixing H 04 N 9/67) [4]
9
/
78
•
•
for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter [4]
9
/
79
•
Processing of colour television signals in connection with recording [4]
9
/
793
•
•
for controlling the level of the chrominance signal, e.g. by means of automatic chroma control circuits [6]
9
/
797
•
•
for recording the signal in a plurality of channels, the bandwidth of each channel being less than the bandwidth of the signal (H 04 N 9/804, H 04 N 9/81, H 04 N 9/82 take precedence) [6]
9
/
80
•
•
Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback [4]
involving pulse code modulation of the colour picture signal components [6]
9
/
806
•
•
•
•
with processing of the sound signal [6]
9
/
808
•
•
•
involving pulse code modulation of the composite colour video-signal [6]
9
/
81
•
•
•
the individual colour picture signal components being recorded sequentially only [4]
9
/
815
•
•
•
•
the luminance signal and the sequential colour component signals being recorded in separate recording channels [6]
9
/
82
•
•
•
the individual colour picture signal components being recorded simultaneously only [4]
9
/
825
•
•
•
•
the luminance and chrominance signals being recorded in separate channels [6]
9
/
83
•
•
•
•
the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal [4]
9
/
835
•
•
•
•
•
involving processing of the sound signal [6]
9
/
84
•
•
•
•
•
the recorded signal showing a feature, which is different in adjacent track parts, e.g. different phase or frequency [4]
9
/
85
•
•
•
•
the recorded brightness signal occupying a frequency band totally overlapping the frequency band of the recorded chrominance signal, e.g. frequency interleaving [4]
9
/
86
•
•
•
the individual colour picture signal components being recorded sequentially and simultaneously, e.g. corresponding to SECAM-system [4]
9
/
87
•
•
Regeneration of colour television signals (H 04 N 9/80 takes precedence) [4]
9
/
873
•
•
•
for restoring the colour component sequence of the reproduced signal [6]
9
/
877
•
•
•
by assembling picture element blocks in an intermediate memory [6]
9
/
88
•
•
•
Signal drop-out compensation [4]
9
/
882
•
•
•
•
the signal being a composite colour television signal [6]
9
/
885
•
•
•
•
•
using a digital intermediate memory [6]
9
/
888
•
•
•
•
for signals recorded by pulse code modulation (error detection or correction of digital signals for recording in general G 11 B 20/18) [6]
9
/
89
•
•
•
Time-base error compensation [4]
9
/
893
•
•
•
•
using an analogue memory, e.g. a CCD-shift register, the delay of which is controlled by a voltage controlled oscillator [6]
9
/
896
•
•
•
•
using a digital memory with independent write-in and read-out clock generators [6]
9
/
898
•
•
•
using frequency multiplication of the reproduced colour signal with another auxiliary reproduced signal, e.g. a pilot signal carrier [6]