BS 7742:1994

Committees responsible
National foreword
Introduction
Section 1. General
1. Scope
2. Object
3. Standard atmospheric conditions for testing
Section 2. Disc parameters
4. Mechanical parameters
5. Disc material
6. Other mechanical parameters
Section 3. Recording parameters
7. Audio parameters
7.1 Channel applications
7.2 Subcarrier frequencies
7.3 Type of modulation
7.4 Polarity of modulation
7.5 Pre-emphasis
7.6 Noise reduction system
8. Video parameters
8.1 Video signal
8.2 Video signal modulation
8.3 Audio subcarrier modulation of main carrier
9. Tracking system and signal format
9.1 Tracking signal frequency
9.2 Index signal frequency
10. Address signals
10.1 Disc code formats
10.2 Audio mode code
10.3 Auto still code
10.4 Chapter numbers
10.5 Program time code
10.6 Track number
10.7 Parity
Appendices
A. Noise reduction/dynamic range expansion system
B. Weighting curves for time-base error
C. Disc case
D. RF spectrum
Table
A1. Response time
Figures
1. Disc profile
2. Information and tracking pits on the disc
3. Block diagram
4. Pre-emphasis curve for video signal
5. ACC characteristics
6a. Maximum vertical deflection or acceleration
6b. Maximum radial deflection or acceleration
7. Relationship between information signal and fp1,fp2
8. Relationship between fp1, fp2 and fp3
9. Disc code formats
10. Bit cell length and digital level
A1. Block diagram
A2.to A8. Untitled
B1. Weighting curve No.1
B2. Weighting curve No.2
B3. Loop gain response of cantilever circuit
C1. Untitled
C2. Untitled
C3. Key code in lid-plate
C4. Untitled
C5. Disc case
C6. Disc case
D1. RF spectrum

Specifies dimensions and other characteristics and their associated methods and/or conditions of measurement, for 260 mm dia electro conductive plastic discs for pre-recording video information and two channels of audio or stereo sound, to ensure interchangeability of both the discs and players.