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3) SECAM COLOR SIGNAL PROCESSING (PB)
PB IN
(A)
21
C
L -
SECAM
Y-FM
PB
12
Out
(a) PB signal (SECAM chrominance signal mixed with Y-FM signal) from the PRE-AMP is applied to the
#21.
(b, c) The Y-FM signal is reduced by the 1.1MHz PRE-BPF, and SECAM chrominance signal is taken out by
the 1MHz BPF which locates after ACC1.
(d) As the same as the REC mode, the chrominance signal is regulated by the ACC1
(e) ANTI-BELL nature of the chrominance signal is equalized by the 1.1 MHz BELL FILTER as same as the
REC mode.
(f) Also the Limiter defines amplitude and remove the noises.
(g) After the Limiter, the chrominance signal is multiplied by 2(1.1 MHz to 2.2MHz).
(h) The 2.2MHz BPF remove high harmonics which appears on the output.
(i) Again the signal multiplied by 2(2.2 MHz to 4.3MHz).
(j) Another harmonics removal.
(k) After that, the chrominance signal is led to the ANTI-BELL FILTER to recover BELL nature as same as
the REC mode.
(l) The ACC2 regulates output signal level, as same as the REC mode.
(m) During the H-SYNC period, a DC level is inserted to the chrominance signal to remove the noises.
(n) As same as the REC mode, peak edges of the chrominance signal are compressed to under defined
level.
(o) The output signal level (#12) is selectable as same as the REC mode in the SECAM mode. If the mode
is not SECAM, the SW changes the output from the ATTENUATOR output (SECAM) to #16 (PAL/NTSC
REC IN) signal.
23
(B)
(C)
1.1M
ACC1
Pre-BPF
SW
ATI
(P)
(O)
16
PAL / NTSC REC Chroma IN
SECAM Colour Signal Processing (Play Back)
22
(D)
(E)
1.1M
1.1M
BPF
Bell
Sync Compress Pulse
Sync.
Sync.
compress.
Gate
(N)
(M)
45
3DQDVRQLF
(F)
(G)
LIM
X2
2.2M
(H)
BPF
(I)
X2
4.4M
(J)
BPF
4.3M
ACC2
(K)
BPF
(L)
19
18
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