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6
IN- SYSTEM PERFORMANCE VERIFICATION
IS
APPENDIX C:
USER ACCESS
6-1
Mono Performance Verification
6-2
Stereo Performance Verification
El
ROUTINE MAINTENANCE
A
/-1
General
7-1
Routine Performance Verification
APPENDIX A:
SYSTEM DESCRIPTION
A-1
Comparison With OPTIMOD-TV Model 8180A
A-2
Input Ampli fier
A-2
30Hz Highpass Filter
A-3
Allpass Phase Scrambler And
Preemphasis/Deemphasis
A-3
Dual-Band " Master/Bass" Compressor
A-3
Crossover And Bass Clipper
A-4
Voltage-Controlled Amplifier Operation
A-4
Compressor Control Circuitry
A-6
Phase-Corrected Lowpass Filter/Preemphasis
A-6
High Frequency Limiter
A-7
Peak Limiting System
A-8
Clipper With Dynamic Threshold
A-8
Hilbert- Transform Clipper
A-9
15kHz Phase-Corrected Bandpass Filter
A-9
Frequency-Contoured Sidechain Overshoot
Compensator
A-10 Balanced Line Amplfier and Deemphasis
A-10 Power Supplies
A-11 Loudness Controller
APPENDIX B:
CIRCUIT DESCRIPTION
B-1
Input Ampli fier
B-1
30Hz Highpass Filter
B-2
Allpass Phase Scrambler And
Preemphasis/Deemphasis
B-2
Dual-Band " Master/Bass" Compressor
B-2
Crossover And Bass Clipper
B-2
Voltage-Controlled Amplifier Operation
B-3
Compressor Control Circuitry
B-5
Gain Reduction Metering
B-6
Gating Circuitry
B-6
Phase-Corrected Lowpass Filter/Preemphasis
B-7
Differential Preemphasis And High Frequency
Limiter
B-7
High Frequency Limiter Control Circuitry
B-8
Peak Limiting System
B-8
Clipper With Dynamic Threshold
B-9
Hilbert- Transform Clipper
B-11
15kHz Phase-Corrected Bandpass Filter
B-12 Frequency-Contoured Sidechain Overshoot
Compensator
B-12 Balanced Line Amplfier With Deemphasis
B-13 Unregulated Power Supply
B-13 + 15 Volt Regulator
B-14 - 15 Volt Regulator
B-14 Miscellaneous Voltage Supplies
B-14 Loudness Controller
C-1
Routine Access
C-1
User Adjustments
C-1
Line Fuse, Power
Selector
C-1
Circuit Cards
C-1
Service Access
C-1
General Cautions
C-2
Cover Removal
C-2
Access To Area Behind
C-2
Access To Input Filter
C-2
Access To Unregulated
C-3
Removal Of Card # PS
Rear Panel And Power
Switch, and Line Voltage
Rear Panel
Card
Power Supply Chamber
(The DC Regulator) From
Transistor Replacement
APPENDIX D:
FIELD AUDIT-OF- PERFORMANCE
PROCEDURE
D-1
General
D-1
Required Equipment
D-1
Audio Processing
D-2
Standard Control Setup
D-2
Skeleton Proof
D-3
Operate- Mode Measurements
D-4
Loudness Controller
APPENDIX E:
FIELD ALIGNMENT PROCEDURE
E-1
General
E-1
Required Test Equipment And Materials
E-2
Card # PS (Power Supply)
E-2
Cards # 3/#4 (Input Buffer/Input Conditioning
Filter/ Compressor Audio Path)
E-4
Card # 5 ( Compressor Control/Gating Detector)
E-4
Card # 6 (Preemphasis/HF Limiter)
E-5
Fig. E-1:
Deemphasis Network
E-5
rig. E-2:
Overall Deemphasized Response
E-6
Cards # 0 And # 1
E-7
Cards # 8/#9
E-7
Fig. E-3:
2.2-15kHz Bandpass Filter Response
E-8
Fig. E-4:
4.4kHz Overdriven FCS Output
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