How many video formats are included in NTIA Performance Specification number 1 and what information should be included in the test report?
Table A3 of ATSC A/53e has been replaced by table 6.2 (compression format constraints) in updated A/53 Part 4 (video) dated 1/3/07. In counting the number of formats that are required as defined by this table, the aspect ratio information column is a bit misleading. The proper way to interpret the values in that column is as follows. The “1” in this column is not another format. It is merely noting the fact that the pixels are square. Therefore, “1, 3” means a single format of a 16:9 aspect ratio with square pixels. Likewise, “1, 2” means a single format of a 4:3 aspect ratio with square pixels. “2, 3” means either a format of a 4:3 aspect ratio or a format of a 16:9 aspect ratio (i.e., two different formats) both with non-square pixels. Therefore, the correct number of formats described in the compression format constraints table is 36. Note that since the allowable frame rates are 24, 30, and 60 Hz plus very slight variations of these frame rates [namely these frame rates multiplied
