NBN EN 60756 : 1994

Committees responsible
National foreword
Specification
1. Scope and object
2. Definitions concerning time base stability
2.1 Gap
2.2 Phase step
2.3 Deviation of line frequency
2.4 Deviation of colour carrier frequency
2.5 Relative displacement
3. Measurement of time base errors
3.1 Gap
3.2 Phase step
3.3 Deviation of line frequency
3.4 Deviation of colour carrier frequency
4. Maximum values of time base errors
4.1 Gap
4.2 Phase step
4.3 Deviation of line frequency
4.4 Deviation of colour carrier frequency
5. Weighting curves
5.1 Weighting curve for CCIR System 525/60
5.2 Weighting curve for CCIR System 625/50
6. Time base stability at playback speeds different
     from the nominal value
6.1 Signal transitions
6.2 Horizontal synchronizing signal
6.3 Vertical synchronizing signal
Figures
1. Signal transition (one field) - One head is used per
     scan
2. Signal transitions (one field) = More than one head
     is used per scan
3. Test arrangement for checking the distortion of the
     synchronizing signal due to signal transitions
     during playback in "trick"-mode

Defines the time base errors of the monochrome and the colour composite video signal reproduced from two head helical-scan domestic video recorders, recording one field on each track. Specifies characteristics and maximum figures of the time base errors to allow design of the horizontal flywheel of television receivers to ensure acceptable stability on the screen. Shows test arrangement for checking the distortion of the synchronizing signal due to signal transitions during playback in 'trick'-mode.