Television – Basic receiver with additional function – Multimode
Reexamination Certificate
1998-07-07
2001-02-20
Powell, Mark R. (Department: 2779)
Television
Basic receiver with additional function
Multimode
C348S577000, C348S581000, C348S582000, C348S649000, C348S572000, C345S156000, C345S156000, C345S182000
Reexamination Certificate
active
06191823
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an analog/digital color video apparatus and method for adjusting attributes of a color image contained in an analog video signal and a digital video signal, and visually displaying an attribute-adjusted video signal through a display, and more particularly, to an analog/digital color video apparatus and method for visually displaying an attribute-adjusted video signal through a flat type display.
2. Description of the Related Art
A conventional color video apparatus employs a flat type display to provide a high quality of image. Flat type displays such as a plasma display and a liquid crystal display use a digitized video signal as an input signal.
FIG. 1
is a block diagram showing the structure of a conventional analog/digital TV using a flat type display and which is compatible with both a digital signal and an analog signal. The conventional analog/digital TV comprises a first attribute adjust portion
10
for receiving an analog video signal and adjusting attributes of the received analog video signal, a second attribute adjust portion
20
for receiving a digital video signal and adjusting attributes of the received digital video signal, a switch
30
, an analog-to-digital (A/D) converter
40
and a flat type display
50
. For convenience of explanation, it is assumed that the analog video signal received by the first attribute adjust portion
10
is a color video signal in accordance with an NTSC (National Television System Committee) standard, and the digital video signal received by the second attribute adjust portion
20
is an HDTV (High Definition Television) video signal which is obtained through a demultiplexing and decoding process.
The first attribute adjust portion
10
receives an analog video signal and adjusts attributes of the received analog video signal. A chroma processor
11
in the first attribute adjust portion
10
generates a luminance signal Y, a first color difference signal R-Y and a second color difference signal B-Y from the received analog video signal. A first matrix circuit
13
generates color signals R, G and B from the luminance signal Y, the first color difference signal R-Y and the second color difference signal B-Y, using a predetermined matrix equation. A first attribute adjuster
15
receives and processes the color signals R, G and B according to a attribute control command input from a control panel
300
by a user and controls attributes such as sharpness, contrast, tint and brightness to then output the attribute-adjusted color signals R, G and B to the switch
30
. The second attribute adjust portion
20
receives a demultiplexed and decoded digital video signal and adjusts the attributes of the received digital video signal. A digital-to-analog (D/A) converter
21
in the second attribute adjust portion
20
converts the received digital video signal into an analog signal. A second matrix circuit
23
generates color signals R, G and B from the output signal of the D/A converter
21
, using a predetermined matrix equation. A second attribute adjuster
25
processes the color signals R, G and B according to attribute control command input from a control panel
300
by a user and adjusts attributes such as sharpness, contrast, tint and brightness to then output the attribute-adjusted color signals R, G and B to the switch
30
. The switch
30
outputs the color signals R, G and B received from the first attribute adjuster
15
or the second attribute adjuster
25
to the A/D converter
40
, according to a display mode select command input from the control panel
300
by a user. The A/D converter digitizes the color signals R, G and B received from the switch
30
. The flat type display
50
combines images contained in the digitalized color signals R, G and B and visually displays the combined color image thereon.
The analog/digital TV of
FIG. 1
converts a digital video signal into an analog signal in order to adjust the attributes of the digital video signal, and then converts the analog-converted signal back to a digital signal for the flat type display
50
which uses the digital signal as an input signal. However, the analog/digital TV of
FIG. 1
generates quantization noise which is caused by the A/D conversion process. The quantization noise deteriorates the quality of a color image displayed on the flat type display
50
.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide an analog/digital color video apparatus for adjusting both attributes of an analog video signal and a digital video signal using digital signal processing, to then eliminate deterioration of quality an image to be displayed.
It is another object of the present invention to provide a method of for adjusting both attributes of an analog video signal and a digital video signal using digital signal processing.
To accomplish the above object of the present invention, there is provided an analog/digital color video apparatus for an analog video signal and a digital video signal, the analog/digital color video apparatus comprising:
a control panel for receiving a display mode select command and an attribute control command from a user; an analog-to-digital converter for receiving and converting an analog video signal into a digital video signal; a format converter for receiving the digital video signal and the analog video signal digitalized by the A/D converter and converting a frame format of the digital video signal and the digitized analog video signal into a frame format of a desired size, according to the display mode select command; a digital attribute adjuster for adjusting the attribute of the video signal format-converted by the format converter; and a display for visually displaying a color image of the video signal attribute-adjusted by the digital attribute adjuster.
There is also provided a color video signal attribute adjust method for adjusting attributes of an analog video signal and a digital video signal to be visually displayed on a display, the color video signal attribute adjust method comprising the steps of:
(a) receiving a display mode select command and an attribute control command from a user;
(b) converting an analog video signal into a digital video signal;
(c) converting the frame formats of the digitized analog video signal in step (b) and the digital video signal into a predetermined frame format, according to the display mode select command; and
(d) adjusting the attribute of the format-converted video signal in step (c), according to the attribute control command.
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Powell Mark R.
Sajous Wesner
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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