Chapter
Page
Section
III.
SYSTEM
INFORMATION 3-22
3-23
SYSTEM
INFORMATION
3-22
3-24
MEDIA
INFORMATION
3-23
3-25
DISK
INFORMATION
3-25
Section IV. BOARD/CHANNEL CONFIGURATION
3-26
3-26
BOARD/CHANNEL
CONFIGURATION
3-26
3-27
RECORD
ENABLE
(RecEnable)
3-26
3-27.1 Telephone Board - RecEnable Modes
3-27
3-27.2 Audio Board - RecEnable Modes
3-27
3-28
VOX
(Voice
Activated) 3-28
3-28.1 Setting the VOX Hold Time 3-28
3-28.2 Setting the VOX Level
3-28
3-29
AUDIO
GAIN
3-30
3-30
BEEP
3-31
3-31
OFF
HOOK
3-31
3-32 AUTOMATIC GAIN CONTROL (AGC)
3-32
Section
V.
DESCRIPTORS
3-34
3-33
FUNCTIONAL
DESCRIPTION 3-34
3-34
COPY
DESCRIPTORS 3-36
4
THEORY
OF
OPERATION
4-1
Section I. PHILOSOPHY OF OPERATION
4-1
4-1
GENERAL
4-1
4-2
COMPROMISES IN LOGGING RECORDERS
4-1
4-3
ANALOG vs. DIGITAL RECORDING 4-1
4-4
AUDIO QUALITY CONSIDERATIONS AND TRADEOFFS 4-2
4-5
FREQUENCY
RESPONSE
4-2
4-6
SAMPLING RATE IN THE VR240 4-3
4-7
DYNAMIC RANGE, SNR, AND THD+N
4-3
4-8
WOW
AND
FLUTTER 4-4
4-9
CROSSTALK
4-4
4-10
DEGRADATION
4-4
4-11
TAPE
USAGE
4-5
Section II. THE VR240 CHANNEL HOUR CAPACITY
4-6
4-12
THE
"CHANNEL
HOUR"
4-6
4-13
HARD
DISK
DRIVE
4-7
Section III. VR240 THEORY OF OPERATION
4-9
4-14
MAIN
COMPONENTS 4-9