Television – Basic receiver with additional function – For display of additional information
Reexamination Certificate
1998-11-24
2001-01-16
Lee, Michael (Department: 2714)
Television
Basic receiver with additional function
For display of additional information
C348S555000, C348S557000
Reexamination Certificate
active
06175387
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a digital TV, and more particularly to a method and apparatus for processing received video data of different video formats.
2. Discussion of the Related Art
A digital TV may receive an NTSC signal or an VGA signal. Accordingly, if one were to examine the number of signal lines necessary for interfacing an NTSC signal with a digital TV receiver, only one pin is required for the analog NTSC signal. Because an analog signal includes the luminance signal Y, the carrier color signal C, and the horizontal/vertical synchronizing signals, one pin can interface an analog NTSC signal. However, more than one is necessary if the NTSC signal is digitized before interfacing the signal with the digital TV.
The VGA signal also requires more than one pin. Specifically, five pins are necessary for interfacing the VGA signal which includes Red (R), Green (G), Blue (B), and vertical/horizontal synchronizing signals. Therefore, if the NTSC and the VGA signals are simultaneously processed, a great number of signal lines are necessary for interfacing the signals, thereby requiring a complicated hardware.
Moreover, additional memory is required during the VGA signal interfacing if the difference between the locations of synchronizing signal intervals and effective data is ignored. For example, a horizontal synchronizing (Hsync) signal is shown in
FIG. 1
(
b
) with respect to the clock shown in (
a
). However, because the signals Y and C are underscanned, the Y and C signals are generated after the Hsync signal as shown in (c) and (d), by a period of nvin_h. Referring to FIG.
2
(
b
), a vertical synchronizing (Vsync) signal is generated with respect to the Hsync signal shown in (a) and the actual video data is also generated after the Vsync by a period of nvin_v shown in (c). As a result, the VGA synchronizing signal and the VGA video signal have different starting points, causing a storage of a portion without an actual video image. The different starting points causes a waste of memory space.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to solve at least the problems and disadvantages of the related art.
Another object of the present invention is to minimize the necessary hardware for a digital TV receiver which can simultaneously process and display input videos with different formats.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and advantages of the invention may be realized and attained as particularly pointed out in the appended claims.
To achieve the objects and in accordance with the purposes of the invention, as embodied and broadly described herein, the digital TV receiver according to the present invention includes a video scaler for receiving a first or a second video and scaling the video; a pretreater for converting the second video format into the first video format; a selector for selecting and forwarding a first video signal or the second video signal from the pretreater, or a scaled first or converted second video signal from the video scaler according to a display format; a synchronization converter for adjusting a synchronizing signal of the second video format into a form identical to a synchronizing signal of the first video signal; and a display processor for displaying the video from the selector according to the synchronizing signal from the synchronization converter.
REFERENCES:
patent: 5208660 (1993-05-01), Yoshida
patent: 5389974 (1995-02-01), Bae
patent: 5485216 (1996-01-01), Lee
patent: 6067123 (2000-05-01), Lee
Lee Michael
LG Electronics Inc.
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