Method and apparatus for transmitting a video signal, and apparatus for receiving a video signal

• Main Authors: ISHIKAWA TATSUYA C O INTEL PRO, KOSHIRO NATSUKI C O INTEL PROP
• Format: Patent
• Language: English; French; German
• Published: 04.01.1995
• Edition: 5
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

A plurality of low-resolution TV signals of their corresponding channels (ch1 to ch4) are supplied to terminals (101 to 104), respectively. The low-resolution TV signals are synthesized by a picture synthesizing circuit (110) into a multichannel low-resolution TV signal having the same format as that of a high-resolution TV signal, and the multichannel low-resolution TV signal is supplied to one of input terminals of a selecting circuit (118). A high-resolution TV signal is supplied from a terminal (107) to the other input terminal of the selecting circuit (118). The selecting circuit (118) is controlled by a control signal to select one of signals from the picture synthesizing circuit (110) and the terminal (107) and supply the selected signal to a high-efficient encoding circuit (111) arranged in an HDTV encoder (120). The high-efficient encoding circuit (111) encodes an input signal with high efficient, and supplies the encoded signal to a buffer circuit (112). A signal output from the buffer circuit (112) is transmitted to a transmission path (113). The signal transmitted through the transmission path (113) is supplied to a buffer circuit (114) arranged in an HDTV decoder (121). A signal output from the buffer circuit (114) is decoded by a decoding circuit (115). The decoded signal is supplied to a display processing circuit (116). When the decoded signal is a high-resolution TV signal, the display processing circuit (116) supplies the decoded signal to an HDTV monitor (117) as it is. When the decoded signal is a multichannel low-resolution TV signal, the display processing circuit (116) image-processes the decoded signal in response to a control signal supplied to a terminal (106) and supplies the image-processed signal to the HDTV monitor (117).