Panasonic NV-HS1000, Руководство по обслуживанию

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1-4-2. Al (ARTIFICAL INTELLIGENCE) RECORDING
FUNCTION
The recording and playback are adjusted to achieve
optimum picture quality from tapes with varying
charactristics.
(1) Detail explanation
<Playback mode>
· The picture quality is varying from the different tapes as
follows:
1) If the output level is low, from worn or rental cassette
tapes, a soft picture is obtained by the RF equlizer and
picture control on the Lumi./Chro. Pack C.B.A.
2) If the output level is medium, from normal tapes, a sharp
picture is obtained from the emphasis and picture control
on the Lumi./Chro. Pack C.B.A.
3) If the output level is high, from HG/S tapes, a sharp and
detailed picture is obtained from the RF equlizer,
emphasis picture control and noise canceller on the
Lumi./Chro. Pack C.B.A.
<Recording mode>
The optimum recording level is used for all head conditions
and for all types of tapes.
1) The luminance S/N is boosted 2 dB.
2) Recording head wear compensation.
3) The optimum recording current is achieved in 1.5
seconds .
(2) Signal Flow
<Playback mode>
1) When the Al is turned on, the Al TRIG (H) signal is
supplied to IC3403 from pin 122 of IC6001. The Al CNT
(H) is supplied to the Lumi./Chro. Pack C.B.A., IC6001
and the Erase Current Generator circuit.
2) The RF C signal from the Head Amp C.B.A. is used by
the IC3403 to detect the output level of the video head.
3) After receiving the RF C signal, the IC3403 supplies
ENVE1 and ENVE2 to the Lumi./Chro. Pack as shown in
Fig. A1.
4) The optimum picture is output from the video circuit.
<Recording mode>
1) When the Al is turned on, the Al TRIG (H) signal is
supplied to IC3403 from pin 122 of IC6001. The Al CNT
(H) is supplied to the Lumi./Chro. Pack C.B.A., IC6001
and the Erase Current Generator circuit.
2) Before recording, the recording and playback operations
are done in the still mode to determine the optimum
recording current. The signal level detection is the same
as the playback mode operation. The recording current
is -set by the REC CUR1, 2, 3 signals from IC3403.
IC3405 is used for erasing the tape in the still mode.
<OtherS>
1-13
The NTSC (L) signal is used for setting the system to
NTSC or PAL.
Other command signals are used to control the
performance timing.