Orban 526A Effect Processor
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Model:
526A
Data:
1979
Kategoria:
Grupa:
Opis:
Digital Sibilance Controller
Informacja
The Orban 526A Dynamic Sibilance Controller has been
designed as a universal de-esser for the recording,
broadcast, and motion picture industries. It offers
electrical specifications consistent with other
state-of-the-art audio signal processing equipment,
extremely simple setup and operation, and dynamic
characteristics which have teen optimized for sibilance
control. The 526A incorporates a circuit which forces the
threshold of de-essing to track the average input level,
permitting constant amounts of de-essing and audibly
consistent results over an input level range of
approximately 15dB.
Compared to its widely accepted predecessor, the
three-channel 516EC
the 526A offers the following improved
features:
1) transformer-coupled, balanced inputs and outputs;
2) mic and line-level inputs;
3) five-segment peak-reading output level indicator;
4) gain control;
5) two segment (normal and heavy) gain reduction
indicator;
6) full RFI suppression;
7) improved circuit stability;
8) improved control-loop dynamics;
9]higher slewrate and lower high-frequency distortion.
De-essers have existed for years, usually as
frequency-dependent sidechains in limiters or compressors.
However, a compressor used as a de-esser cannot function
optimally if one attempts to compress and de-ess with the
same device, since optimum compression ratios, attack times,
and release times are quite different for the tv modes of
operation. In addition, such devices are often
insufficiently adjustable, and often contain simple filters
whose selectivity is inadequate to provide sufficient
differentiation between sibilance frequencies and the lower
frequencies where most of the voice energy is concentrated.
Further, these devices cannot simultaneously de-ess voice
and maintain natural dynamic range because their thresholds
are fixed.
It is clear that a specialized de-esser is therefore
necessary to perform the sibilance control only. It is
ordinarily the last piece of processing hardware in a chain
which may include both an Equalizer and a compressor or
limiter. Both devices will tend to increase sibilance with
reference to the energy of the lower-frequency vocal
components; the de-esser then knocks down sibilance levels
until they are once again natural-sounding and do not cause
overload in recording media employing high frequency
preemphasis.
It is this function which the 526A serves. When not
de-essing, it acts as a high-quality Amplifier. When the
level in the sibilance band attempts to exceed a certain
fraction of the peak input level (said fraction being
adjusted by the operator with the threshold control) , then
the gain is automatically reduced to hold the output at this
threshold level.
Hie 526A attacks in approximately 1mS and recovers in
approximately 1OmS. It can thus act on sibilance without
affecting surrounding vocal sounds. Because the entire
channel gain is reduced (as opposed to de-essers which
operate as program-controlled filters) , any residual IM
distortion which accompanies the original sibilance is
reduced along with the sibilance itself.
Typ ręczny:
Serwis i User Manual
Strony:
13
Rozmiar:
1.48 Mbytes (1556542 Bytes)
Język:
english
Rewizja:
Ręczny ID:
Data:
1979 01 01
Jakość:
Skanowany dokument, czytając częściowo źle, nie częściowo czytelny.
Data przesłania:
2017 10 25
MD5:
ef6cd6cbffb6b991ce572df89d726b23
Pobrane:
481
Informacja
SPECIFICATIONS
Section 1: DESCRIPTION: I
Section 2: INSTALLATION: 1
Inspection: 1 Mounting the Chassis: 1 Electrical:
Input: 1 Output: 2 Interface: 2 AC Power: 2
Section 3: OPERATING INSTRUCTIONS: 2
Applicability and Limitations: 2 Patching Into the System: 2
Adjustment of the Operating Controls: 3 Internal Adjustment
for Extra-Noisy Tracks: 3
Section 4: MAINTENANCE: 3
Performance Test and Alignment: 3 Equipment Required: 3
Power Supply: 3 Signal-Processing Circuitry: 3 Preventive
Maintenance: 4
Replacement of Components on Printed Circuit Boards: 4
Troubleshooting IC Opamps: 4 Factory Service: 5 Shipping
Instructions: 5
Section 5: CIRCUIT DESCRIPTION: 5
Main Audio Path: 5 Control Circuit: 5 Level-Tracking
Circuit: 6 Level Indicator: 6 Power Supply: 6
PARTS LIST : 7
ASSEMBLY DRAW INS : 9
SCHEMATIC DIAGRAM