Control Signal Recording System; Audio Signal Recording System; Audio Signal Recording Level; Audio Signal Recording Current - JVC HR-S10EG Service Manual

1.7 CONTROL SIGNAL RECORDING SYSTEM
Control signal waveform, polarity and video head relation-
ships are indicated in Fig. 1-16,
Phase of the control signal is the same as the vertical sync
signal rise component of the CH-1 track. The positive pulse
voltage is the reference 25 Hz.
The control signal is recorded on the control track above
the saturation recording level.
Vertical syne
Saturation
recording
level
Recording current
3 34
1 H
Ty >20ms i
40 ms H
Playback voltage
25 Hz rectangular
wave synchronized |
to video head rotation
' CHa} CH2 !
Video head CHA | CH-2 |
Fig. 1-16 Control signal
1.8 AUDIO SIGNAL RECORDING SYSTEM
1.8.1 Audio Signal Recording Level
Audio signal is recorded on the audio track to the defined
level using an AC bias current recording system.
1.8.2 Audio Signal Recording Current Characteristics
The equalizing amplifier controls the recording current in
order to obtain a flat frequency characteristic in the re-
produced output. See Fig. 1-17.
°
4 3
Response (dB)
& 8
1 8
30 10 108 108
== Frequency (Hz)
T) = 3180 psec, T2 = 120 usec
Fig. 1-17 Audio equalizing frequency characteristics