Circuit Operating Descriptions
7-40
7-10 SECAM
(1) REC Mode
Fig. 7-36 Signal flow in REC mode
16
12
Video signals which input to Pin 16, pass 4.3MHz BPF, unnecessary component (ex : sync signal) is removed, and
take component of chroma signal. And to be flat the characteristics when it is sending by REC-BELL circuit.
This REC-BELL circuit is automatically adjusted to be 4.286MHz for center frequency. After that,the pulse width is
limited by limiter amplifier pass the 1/4 divided circuit and converted to 1/4 for chroma signal frequency. As for
converted signal, the noise of non-signal parts of sync signal is amplified by limiter amplifier, in order to be
remove components of the sync signal generates by sync gate circuit. Also this signal is squarewave, and contains
unnecessary components, at first, through 1.1MHz BPF and nextinput to REQ-EQ. REC-EQ has the same
characteristics of BELL characteristics, automaticallyadjust to be 1.0715MHz for center frequency. Afterwards,
unnecessary components around the sync signal are muted, low chroma signal is output to Pin 18 after through
Buffer. This mute circuit also has the function of remove unnecessary component during vertical sync signal and
output control owing to Pin 1.
(2) PB Mode
Fig. 7-37 Signal flow in PB mode
14
18
The signal which input from Pin 14, at first enter AGC amplifier and adjust for lever. Gain of this AGC amplifier
is controlled to be fixed the 4fsc clock generator with PLL circuit of output level(VM) which shows below. Thus,
pass the 1.1MHz BPF, remove unnecessary components, input to PB-EQ which has 1.1MHz Anti-BELL
characteristic. This center frequency of PB equalizer, automatically adjusted to be 1.0715MHz. Next, enter 4fsc
clock generator with PLL circuit. +4.3MHz BPF remove unnecessary, component of frequency generate in 2fsc
clock generator owing to limiter amplifier are cleaned by performance of sync gate circuit. This signal has a
rectangle waveform, for contain unnecessary components of frequency, due to through 4.3MHz BPF, next input to
PB-BELL. PB-BELL automatically adjust to 4.286MHz of center frequency, and return to BELL characteristics when
it is sending.
Summary of Contents for SV-DVD50
Page 26: ...Exploded View and Parts List 3 10 Samsung Electronics MEMO ...
Page 88: ...VCR Deck Operating Description 8 12 Samsung Electronics Fig 8 14 Mecha Timing Chart ...
Page 102: ...VCR Deck Operating Description 8 26 Samsung Electronics MEMO ...
Page 109: ...Circuit Operating Descriptions 7 7 Fig 7 12 Block Diagram ...
Page 143: ...Circuit Operating Descriptions 7 41 3 Block Diagram Fig 7 38 LA70100M Block Diagram ...
Page 158: ...Block Diagram 10 2 Samsung Electronics MEMO ...
Page 159: ...Samsung Electronics 11 1 11 Wiring Diagram ...
Page 160: ...Block Diagram 11 2 Samsung Electronics MEMO ...
Page 162: ...Schematic Diagrams 12 2 Samsung Electronics 6 1 S M P S ...
Page 163: ...Schematic Diagrams Samsung Electronics 12 3 6 2 Power Drive ...
Page 164: ...Schematic Diagrams 12 4 Samsung Electronics DT701 6 3 Display Function ...
Page 165: ...Schematic Diagrams Samsung Electronics 12 5 6 4 System Control Servo ...
Page 166: ...Schematic Diagrams 12 6 Samsung Electronics 6 5 A V ...
Page 167: ...Schematic Diagrams Samsung Electronics 12 7 6 6 Hi Fi ...
Page 168: ...Schematic Diagrams 12 8 Samsung Electronics 6 7 A2 NICAM ...
Page 169: ...Schematic Diagrams Samsung Electronics 12 9 6 8 SECAM Option ...
Page 170: ...Schematic Diagrams 12 10 Samsung Electronics 6 9 OSD VPS PDC ...
Page 171: ...Schematic Diagrams Samsung Electronics 12 11 6 10 TM ...
Page 172: ...Schematic Diagrams 12 12 Samsung Electronics 6 11 Input Output ...
Page 173: ...Schematic Diagrams Samsung Electronics 12 13 6 12 DVD AV Decoder ...
Page 174: ...Schematic Diagrams 12 14 Samsung Electronics 6 13 DVD Servo ...
Page 175: ...Schematic Diagrams Samsung Electronics 12 15 6 14 DVD Audio Video ...
Page 176: ...Schematic Diagrams 12 16 Samsung Electronics MEMO ...
