BS 7486-1:1991
Current
The latest, up-to-date edition.
Specification for helical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type Beta format. FM audio recording 625 line-50 field systems
Hardcopy , PDF
English
30-09-1991
Committees responsible
National foreword
Specification
1. Scope
2. Normative reference
3. Recording method
4. Mechanical configuration
4.1 FM audio track pattern
4.2 Head azimuth angles
4.3 Recording time difference
5. Recording characteristics
5.1 Dynamic emphasis
5.2 Carrier centre frequency
5.3 Frequency deviation
5.4 Recording level
5.5 Modulation polarity
6. Other subjects
6.1 Channel application
Annex
A. Encoder transient measurement method
Tables
1. Head azimuth angles
2. Frequency response - Encode mode
3. Channel application
Figures
1. Track pattern of beta for FM audio system (625
lines-50 field)
2. Video and FM audio signal spectrum (625 line-
50 field)
3. Block diagram of FM audio recording system
4. Block diagram of dynamic emphasis
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