SUPER IMPOSE CIRCUIT

• Main Author: CHOE, HAE-MIN
• Format: Patent
• Language: English; Korean
• Published: 15.05.1998
• Edition: 6
• Subjects: ACCESSORIES THEREFOR; ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; BASIC ELECTRONIC CIRCUITRY; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; RESONATORS; SOUND-PRODUCING DEVICES

본 발명은 슈퍼임포즈 회로를 공개한다. 영상장치에서 사용되는 그 회로는 RGB신호를 외부영상신호에 고속으로 슈퍼임포즈하기 위해, RGB신호를 픽셀단위로 분리, 변조, 증폭 및 합성하여 구해진 복합영상신호와, 외부에서 입력되는 외부영상신호를 선택적으로 출력함으로써 슈퍼임포즈를 수행한다. A superimposing circuit includes an N-bit transmission gate for transmitting N-bit RGB data in a pixel unit in response to a blanking signal; a signal synthesizer for generating R, G and B signals, by separating each component of R, G and B from the N-1 least significant bits of the N-bit RGB data output from the transmission gate; an RGB matrix for receiving the R, G and B signals and generating a luminance signal, first and second color difference signals; a luminance signal amplifier for amplifying the luminance signal; a pair of modulators for modulating the first and second color difference signals, respectively; a first mixer for synthesizing the modulated color difference signal and generating a carrier color signal; a second mixer for synthesizing the carrier color signal, the amplified luminance signal and a complex synchronizing signal and generating a complex image signal; an attenuator for attenuating an external image signal; an image signal selector for selectively outputting the attenuated external image signal or the complex image signal according to the most significant bit value of the N-bit RGB data; and an output amplifier for amplifying the selected image signal. Therefore, the internal and external image signals can be superimposed at high speed in a pixel unit.