Receiver and channel compatible encoding/decoding system for high definition video

A decoder for decoding the second television signal from the third television signal encoded by an encoder for converting said second television signal with a high resolution and having the larger number of horizontal scanning lines, a broader frequency bandwidth and a larger aspect ratio of a frame relative to the first television signal into said third television signal which is compatible with said first television signal, said decoder comprising:

• means for separating a central scanning line portion and upper and lower scanning line portions of said third television signal;
• means for extracting a luminance horizontal low band component from said central scanning line portion;
• means for extracting a luminance horizontal high band component signal having luminance horizontal high band components multiplexed on the side of said decoder in a frequency region higher than the frequency region of said luminance horizontal low band component, from said central scanning line portion;
• means for frequency-converting said luminance horizontal high band component signal into said luminance horizontal high band components arranged in plural frequency regions high than the frequency region of said luminance horizontal low band component;
• means for combining said luminance horizontal high band components with said luminance horizontal low band component to obtain a broad-band luminance horizontal signal;
• a first scanning line number conversion means for converting the number of scanning lines of said broad-band luminance horizontal signal into the number of scanning lines of said second television signal;
• a second scanning line number conversion means for converting the number of scanning lines of the signals in the upper and lower scanning line portions into signals having scanning lines, the number of which is equal to the number of scanning lines of said second television signal;
• and
• means for combining the outputs from said first and second scanning line number conversion means with each other.

A broad bandwidth television signal transmission system having an encoder for converting a second television signal with a high resolution and having the larger number of horizontal scanning lines, a broader frequency bandwidth and a larger aspect ratio of a frame relative to a first television signal into a third television signal which is compatible with said first television signal, and a decoder for decoding a second television signal from a third television signal encoded by an encoder for converting said second television signal with a high resolution and having the larger number of horizontal scanning lines, a broader frequency bandwidth and a larger aspect ratio of a frame relative to a first television signal into said third television signal which is compatible with said first television signal, said system comprising on the transmitter side:

• means for separating a luminance vertical high band component of said second television signal which is higher than a luminance vertical low band component of said second television signal from said second television signal, said luminance vertical high band component of said second television signal corresponding to a central scanning line portion out of said central portion and upper and lower scanning line portions of said first television signal, said central scanning line portion and said upper and lower scanning line portions being divided in the ratio of an aspect ratio of said first television signal to that of said second television signal;
• means for converting the number of scanning lines of said second television signal obtained by removing said luminance vertical high band component from said second television signal, into the number of scanning lines in said central portion;
• means for frequency-converting a luminance horizontal high band component in the second television signal from said means for converting and having a bandwidth higher than a frequency bandwidth of said first television signal, into a separable signal which is multiplexed to a frequency region higher than the frequency region of a luminance horizontal low band component in said second television signal and is separable on a decoder side;
• means for multiplexing said separable signal to a luminance horizontal low band component;
• delay means for time-shifting said luminance vertical high band component of said second television signal to said upper and lower scanning line portions;
• means for combining an output from said means for multiplexing with an output from said delay means to obtain said third television signal;
• and
• transmitting means for modulating a carrier signal by said third television signal from said means for combining and for transmitting the modulated carrier signal;
• and
• said system further comprising on the receiver side:
• receiving means receiving the transmitted modulated carrier signal and for demodulating the third television signal therefrom;
• means for separating a central scanning line portion and upper and lower scanning line portions of said third television signal;
• means for extracting a luminance horizontal low band component from said central scanning line portion;
• means for extracting a luminance horizontal high band component signal having luminance horizontal high band components multiplexed on the side of said decoder in a frequency region higher than the frequency region of said luminance horizontal low band component, from said central scanning line portion;
• means for frequency-converting said luminance horizontal high band component signal into said luminance horizontal high band components arranged in plural frequency regions high than the frequency region of said luminance horizontal low band component;
• means for combining said luminance horizontal high band components with said luminance horizontal low band component to obtain a luminance horizontal signal;
• a first scanning line number conversion means for converting the number of scanning lines of said luminance horizontal signal into the number of scanning lines of said second television signal;
• a second scanning line number conversion means for converting the number of scanning lines of the signals in the upper and lower scanning line portions into signals having scanning lines, the number of which is equal to the number of scanning lines of said second television signal;
• and
• means for combining the outputs from said first and second scanning line number conversion means with each other.

A broad bandwidth television signal recording/reproducing system having an encoder for converting a second television signal with a high resolution and having the larger number of horizontal scanning lines, a broader frequency bandwidth and a larger aspect ratio of a frame relative to a first television signal into a third television signal which is compatible with said first television signal, and a decoder for decoding a second television signal from a third television signal encoded by an encoder for converting said second television signal with a high resolution and having the larger number of horizontal scanning lines, a broader frequency bandwidth and a larger aspect ratio of a frame relative to a first television signal into said third television signal which is compatible with said first television signal, said system comprising on the recording side:

• means for separating a luminance vertical high band component of said second television signal which is higher than a luminance vertical low band component of said second television signal from said second television signal, said luminance vertical high band component of said second television signal corresponding to a central scanning line portion out of said central portion and upper and lower scanning line portions of said first television signal, said central scanning line portion and said upper and lower scanning line portions being divided in the ratio of an aspect ratio of said first television signal to that of said second television signal;
• means for converting the number of scanning lines of said second television signal obtained by removing said luminance vertical high band component from said second television signal, into the number of scanning lines in said central portion;
• means for frequency-converting a luminance horizontal high band component in the second television signal from said means for converting and having a bandwidth higher than a frequency bandwidth of said first television signal, into a separable signal which is multiplexed to a frequency region higher than the frequency region of a luminance horizontal low band component in said second television signal and is separable on a decoder side;
• means for multiplexing said separable signal to a luminance horizontal low band component;
• delay means for time-shifting said luminance vertical high band component of said second television signal to said upper and lower scanning line portions;
• means for combining an output from said means for multiplexing with an output from said delay means to obtain said third television signal;
• and
• recording means for recording said third television signal from said means for combining on a recording medium;
• and
• said system further comprising on the reproducing side:
• reproducing means for reproducing the third television signal from said recording medium;
• means for separating a central scanning line portion and upper and lower scanning line portions of said third television signal;
• means for extracting a luminance horizontal low band component from said central scanning line portion;
• means for extracting a luminance horizontal high band component signal having luminance horizontal high band components multiplexed on the side of said decoder in a frequency region higher than the frequency region of said luminance horizontal low band component, from said central scanning line portion;
• means for frequency-converting said luminance horizontal high band component signal into said luminance horizontal high band components arranged in plural frequency regions high than the frequency region of said luminance horizontal low band component;
• means for combining said luminance horizontal high band components with said luminance horizontal low band component to obtain a luminance horizontal signal;
• a first scanning line number conversion means for converting the number of scanning lines of said luminance horizontal signal into the number of scanning lines of said second television signal;
• a second scanning line number conversion means for converting the number of scanning lines of the signals in the upper and lower scanning line portions into signals having scanning lines, the number of which is equal to the number of scanning lines of said second television signal;
• and
• means for combining the outputs from said first and second scanning line number conversion means with each other.