d. When a VIR signal is present on a signal to be recorded on a video tape
recorder, the VIR signal as passed by the video tape recorder shall be considered
as reference for either manual or automatic adjustment of the reproduced signal
characteristics listed below:
Luminance amplitude --------------------
50 Peak IRE
Black level amplitude ------------------
7.5 IRE
Sync amplitude -------------------------
-40 Peak IRE
Chrominance ----------------------------
90 Peak IRE
Color burst amplitude ------------------
+/- 20 IRE
e. The VIR signal will be recorded by only one head of a multihead video tape
recorder. Since it is essential to balance head output levels, this characteristic
does not reduce the usefulness of the VIR signal. The waveform of the VIR signal
is shown in Figure 3-9.
Figure 3-9.
Standard vertical reference signal
57
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