Television – Format conversion – Changing number of fields for standard conversion
Reexamination Certificate
2000-06-26
2003-02-18
Lee, Michael H. (Department: 2614)
Television
Format conversion
Changing number of fields for standard conversion
C348S443000
Reexamination Certificate
active
06522363
ABSTRACT:
BACKGROUND
The present invention relates generally to television receivers, and more specifically to display frame rate adaptation in a DC coupled and constant slope ramp vertical deflection system.
FIG. 1
is a system block diagram
100
of an exemplary TV receiver for processing analog or digital format signals. Operation of the receiver
100
will be discussed in the context of National Television Systems Committee (NTSC) and Advanced Television Systems Committee (ATSC) signal standards. However, practice of the inventive aspects laid out herein are not limited to NTSC and ATSC signal standards. Out of the tuner
100
, a digital signal DS is fed to a de-multiplexor
102
, a known type of digital decoder, which sends a selected video signal to a video decoder
104
that provides red R, green G and blue B color component signals to the picture tube
107
. An analog signal AS received from the tuner
101
is fed to an NTSC decoder
104
to provide a selective video signal for further video processing
104
, which provides R, G and B color component signals to the picture tube
107
. The NTSC signal out of the decoder
103
to the video decoder/processor
104
is format converted from
540
P progressive active lines. Horizontal and vertical synchronization signals Hsync and Vsync are generated by a raster generator
105
in response to the video decoding or processing
104
. The synchronization signals are then fed to a deflection process
106
that provides vertical and horizontal deflection signals Vert and Horiz to drive deflection coils
108
,
109
.
Generally, the raster generator
105
must be synchronized to the received signal so that picture frames are displayed at the same rate in which they were transmitted with the video signal. Dropping or repeating of frames is undesirable for the portrayal of motion by quality TV receivers. A reasonable way must be identified for a TV receiver to track the incoming frames to avoid generation of temporal artifacts. There are 18 picture scanning formats and frame rates supported by the ATSC standard, based on frame rates of 60 Hz, 30 Hz and 24 Hz. However, if the NTSC friendly rates of 59.94 Hz, 29.97 Hz and 23.97 Hz are considered, which will permit video reception of NTSC signals during the simulcast period of both ATSC and NTSC, then there are a total of 36 picture formats. Given the number of ATSC picture formats alone, tracking the incoming video picture frame frequency becomes difficult when the objective is a TV deflection system design optimized to work over a narrow range of frequencies.
REFERENCES:
patent: 4831441 (1989-05-01), Ando
patent: 5508747 (1996-04-01), Lee
patent: 5734435 (1998-03-01), Wilson et al.
patent: 6028639 (2000-02-01), Bhatt et al.
patent: 0779741 (1997-06-01), None
Deiss Michael Scott
Flickner Andrew Kent
Fried Harvey D.
Kolodka Joseph J.
Lee Michael H.
Thomson Licensing S.A.
Tripoli Joseph S.
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