JVC DD-9 A - Page 8

Tee
TTT
TTT
ce
TTT
BATT
HTT
LTT
CHAE
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TTT
Fig. A Low-level encoding frequency response
The effect also extends about two octaves lower with C-
These curves, showing the maximum low-level boost im-
parted by both C-type and B-type noise reduction in the type noise reduction to maintain subjectively uniform noise
level across the spectrum. Processing at very low frequencies
absence of high frequency signals, illustrate some of the
is not required with either system because low frequency
noise
similarities and differences between the two systems. Dolby
C noise reduction imparts more boost in recording and
more cut in playback, thus providing more noise reduction.
in properly engineered cassette
insignificant
is
recorders.
TO RECORDING
AMPLIFIER
IC2
SIDE*CHAIN OF
LOW: LEVEL
STAGE
4
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J
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A Se ee
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L
DOLBY C-TYPE ENCODER
ANTI-
SATURATION
NETWORK
HIGH *LEVEL
STAGE
SIDE-CHAIN OF
ae
SPECTRAL
SKEWING
FROM INPUT
STAGES
KB
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— =)
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SPECTRAL
SKEWING
4
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STAGE
SIDE+ CHAIN OF
HIGH? LEVEL
eles
SATURATION!
NETWORK
5
|
SIDE+ CHAIN OF
LOW-LEVEL
STAGE
ae
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oc Sui aa
ter
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DOLBY C-TYPE DECODER
Dolby C-type NR block diagram
Fig. B
—6-B—