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CPP100
SECTION 6
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
6.25
DEFT (Digital Electronic Film Transfer)
Background
DEFT is a specialised standards converter, which is used to convert 525 (59.94) film, originated material to
625 (50). Utilising a two-field aperture, and taking the film sequence data into account, the standards
converter attempts to preserve frame integrity by utilising the field pairs from original film frames. On
electronically edited material, the characteristic film sequence is typically disturbed and a new sequence must
be re-established.
DEFT requires explicit identification of the 3:2 sequence to ensure correct pairing of input fields. This is
achieved through a 3-bit code as described in earlier sections of this document. In situations where electronic
editing has reduced an original film pair to a single field, an additional single-field-flag is required to indicate
that the current field should be processed using a single field aperture.
DEFT Flags
To ensure backwards compatibility with existing DEFT equipment the flags are embedded in the two words
immediately following the EAV code on every line. The code is updated on the line during which the V flag has
falls (at the end of the digital vertical blanking period).
The flag information is updated on the following lines: -
HANC
625 line Standard
525 line Standard
Field 1
23
10
Field 2
336
273
The word contains the following flags:
Bit
Analysis Flags
9
3:2 Sequence bit 2
8
3:2 Sequence bit 1
7
3:2 Sequence bit 0
6
Single Field Flag
5
Repeat Field Flag
4
Shot change
3
Sequence change
2
NOT film
Bits 0 and 1 are always zero