Single channel NTSC compatible EDTV system

摘要: An extended definition television (EDTV) system transmits, receives and displays both EDTV NTSC signals using a channel bandwidth. The procudes an broadcast signal having picture with 16:9 aspect ratio at least one adjacent horizontal border to produce overall image apsect of 4:3. Picture information is also selectively modulated onto the border. transmitted in format, receiving circuit provided comprising display ratio, detector for determining whether or other type being received, expansion responsive expanded display. When it filtered vertically horizontally displayed on derives from portion signal. vertical so that has 4:3 ratio. compatible may be received standard receivers as