BS ISO 9642:2020 pdf download

BS ISO 9642:2020 pdf download

BS ISO 9642:2020 pdf download.Cinematography — Time and control code for 24, 25 and 30 frames per second motion-picture film systems — Specifications
1 Scope
This document specifies digital code for mats and modulation methods for motion-picture film to be used for timing, control, editing and synchronization purposes. This document also specifies the relationship of the codes to the motion picture frame. Two types of code are described in this document. The first type, Type C, is a continuous code which is very similar to the continuous code specified in IEC 60461. This type of code can be used in situations where the film is moving continuously at the time of both recording and reproduction. The second type of code, Type 8, is a non-continuous, block-type code, composed of blocks of data, each complete in itself, with gaps between the blocks. It is designed so that the code can be recorded and played back on equipment with intermittent film motion but still be decoded with the same type of electronic equipment used to read the Type C or continuous time code.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 2022, Information technology — Character code structure and extension techniques
ISO 4241, Cinematography — Projection film leader (time-based), trailer and cue marks — Specifications
ISO 8758, Cinematography — Photographic control and data records on 16 mm and 35 mm motion-picture
film and prints — Dimensions and location
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
3.1 real time
<NTSC colour recording> time elapsed during the scanning of 60 fields (or any multiple thereof) in an ideal television system at a vertical field rate of exactly 60 fields per second
3.2 colour time
<NTSC colour recording> time elapsed during the scanning of 60 fields (or any multiple thereof) in a colour television system at a vertical field rate of approximately 59,94 fields per second
5.2 Type 8 code format
5.2.1 Each motion-picture frame shall be identified by a unique and complete address.
5.2.2 The frames shall be numbered successively 0 to 23, 24 or 29 inclusive, corresponding to the frame rate being used.
5.2.3 Each address shall consist of 112 bits numbered 0 to 111 inclusive.
5.2.4 The bits shall be assigned as shown in the appropriate columns of Figure 1 and in Table 1.