CCIR System D

The general specifications for System D are listed below: • Frame rate: 25 Hz • Interlace: 2/1 • Field rate: 50 Hz • Lines/frame: 625 • Line rate: 15.625 kHz • Visual bandwidth: 6 MHz • Vision modulation: Negative • Preemphasis: 50 μs • Sound modulation: FM • Sound offset: +6.5 MHz • Channel bandwidth: 8 MHz Television channels were arranged as follows: • The original assignments of channels 25 to 57 were 2 MHz higher in frequency until c. 1984. Channels 58 to 62 were deleted at this time. == See also ==