Method and apparatus for conversion of video formats to 120 Hz 4 to 1 interlaced formats

A method for converting video data in a first interlaced video format to video data in a second interlaced video format comprising:

• selecting a first set of lines comprising alternate lines from a first field of a frame of the first interlaced video format;
• selecting a second set of lines comprising alternate lines not selected for the first set of lines from the first field of the frame of the first interlaced video format;
• selecting a third set of lines comprising alternate lines from a second field of the frame of the first interlaced video format;
• selecting a fourth set of lines comprising alternate lines not selected for the third set of lines from the second field of the frame of the first interlaced video format;
• and
• mapping each set of lines into a different field of four fields of the second interlaced video format.

A method for converting video data in a progressive first video format to video data in an interlaced second video format comprising:

• wherein a number of frames of the first video format to be mapped into a frame of the new video format is equal to the number of fields in the second video format times the display frequency of the first video format divided by the display frequency of the second video format;
• wherein a number of lines from each of the number of frames of the first video format to be mapped into fields of the frame of the second video format is the number of lines in the frames of the first video format divided by the number of frames of the first video format to be mapped into the frame of the new video format;
• selecting a first set of lines comprising alternate fourth lines from one of the number of frames of the first video format;
• selecting a second set of lines comprising alternate fourth lines not selected for the first set of lines from one of the number of frames of the first video format;
• selecting a third set of lines comprising alternate fourth lines not selected for the first or second set of lines from one of the number of frames of the first video format;
• selecting a fourth set of lines comprising alternate fourth lines not selected for the for the first, second or third set of lines from one of the number of frames of the first video format;
• and
• mapping each set of lines into a different field of four fields of the second video format.

An apparatus for converting video signal data in a first video format to video signal data in a second video format comprising:

• one or more video inputs, each video input adapted to receive video signals in a different video type, the video signals in the first video format and each video input adapted to output a digital video signal;
• a storage device adapted to receive and store the digital video signals;
• a scan controller adapted to read a stored digital signal of the stored video signals or receive the digital signal from the one or more inputs and adapted to convert the format of the digital signal from the first video format to the second video format, the second video format comprising four interlaced fields and having a field display frequency of 120 Hz;
• and
• one or more video outputs, each video output adapted to receive the digital video signal in the second video format and adapted to output the video signal in the second video format.