Bit Rate, Recording
Bit Rate, Recording – The bit rate required of a recorder mated to a video camera or functioning in the origination, post-production, or distribution is generally greater than the concurrent bit rate, real-time because of the error correction designed into the recording format. This “overhead” may increase the bit rate, sometimes by as much as one-third, and frequently sets a practical limit in systems design. Examples in the following table are intended only to clarify the definition. They indicate the range of some systems currently considered and a first estimate of their challenges. Probable Recording Rate, Mbits/s (1, 2) Bits Maximum CCIR CCIR Per Levels Rec 601-2 (3) Rec 709 (3) (1) All systems postulated employ field rates of 60 or 59.94 Mbits/s, component encoding and 2:1 interlace. Progressive scan systems at the same frame rates would have double these bit rates. (2) Estimates for gross data recording rates assume the same ratio of overhead to data bits in component format recording as that in the D-1 standard. (3) CCIR Recommendations 601-2 and 709 document 8-bit and 10-bit sampling, based upon sampling frequencies that are integral multiples of 2.25 MHz (i.e., 13.5 MHz for Rec 601-2). (4) The D-1 standard recording format is defined by SMPTE 224M and its related SMPTE Recommended Practices and Engineering Guidelines.
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