Orban 245F Effect Processor
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processes any monophonic sound
source into pseudostereo quickly and easily. The
pseudo-stereo does not degrade the quality of the mono
recording, and possesses many attributes of true stereo,
such as depth, space, directionality, stability, and good
The synthetic stereo is created by a complementary comb
filter derived by a patented phase-cancellation technique.
The incoming spectrum is divided into five bands of about
two octaves each. Bands are alternately placed in the left
and right channels, producing a convincing stereo illusion.
The two DIMENSION controls vary the relative positioning of
the bands. This facilitates achieving good subjective
channel balance regardless of the average spectral balance
of the program.
There is a "best compromise" DIMENSION setting (LGW=3.0;
HIGH=7.5) which works well for average program material.
This setting may be used if it is impractical to readjust
the DIMENSION controls for each new piece of program material.
If you wish to set the DIMENSION controls permanently (so
that they cannot be accidentally misadjusted), fixed
resistors or Beckman 72PR25K trimmers can be installed in
holes provided in the circuit board.
A STEREO/MONO switch provides quick comparison between the
original mono input and the stereo-synthesized output.
A SEPARATION control allows reduction of the stereo
separation by partially mixing the channels. This may be
useful to permit more natural headphone listening, to reduce
the vertical cutter excursion in disk cutting, and to
increase mono loudness in FM stereo broadcast ing.
A GAIN control is located between the active-balanced input
stage and the signal processing circuitry. Thus it cannot
prevent overload of the input stage due to excessive drive
levels. Up to 9dB of gain is available.
Mono compatibility is assured by the following facts:
I. The electrical sum of the two output channels is
proportional to the mono input to the Synthesizer
. Thus, a
listener can recover the original mono by summing the two
stereo channels together. This removes many "purist"
objections to pseudo-stereo, since the purist can choose
freely between pseudo-stereo and the original mono. It also
means that mono FM listeners will hear the original mono
source when listening in mono to a stereo FM station, and
that the lateral modulation of a stereo disk will represent
the original mono signal.
2. The sum of the left and right powers (as a function of
frequency) is proportional to the power in the mono input.
Thus, the acoustical frequency balance of the pseudo-stereo
is identical to the frequency balance of the mono:
coloration is not introduced by the synthesis process.
Both (I) and (2) hold for ony adjustments of the Stereo
The output of the Stereo Synthesizer
can drive any device
requiring standard line levels and impedances. If gain
balance is carefully maintained after the Stereo
Synthesizer, then the following relationships will hold
1. If the Stereo Synthesizer
output is recorded on tape and
is later played back on a machine having substantial time
delay or phase shift between the two channels, the "phasing"
sound in the mono sum signal will be greatly reduced.
2. In disk cutting, the lateral cut will represent the
original mono input of the Stereo Synthesizer
. On playback,
if the channels of the stereo pickip are paralleled, the
output will represent the original mono source.
3. In FM stereo broadcasting, mono listeners will hear the
original mono signal.
The input is active-balanced, bridging. The outputs are
supplied unbalanced, but can be balanced by installation of
a retrofit kit available from your Orban
dealer or directly
. The kit consists of hardware and two
specially-designed transformers. Holes are provided in the
chassis for quick field installation.
If the "+" input is driven positive, the output will also be
driven positive. That is, the device is non-inverting
("in-phase") from input to output.
Serviço e Manual do Usuário
Serviço e Manual do Usuário
2.25 Mbytes (2364456 Bytes)
01 January 1993
Scaned documento, todas legível.
24 October 2017
I Part A: Installation And Operation
Introduction Mechanical Installation
Optional Balanced Output Transformer Installation ELECTRICAL
INSTALLATION Input Output
Wiring The 245F
With Two-Conductor Shielded Cable Table I:
Typical Input/Output Connection Rules Wiring The 245F
Single-Conductor Shielded Cable
7 Part B: Maintenance
1. PERFORMANCE EVALUATION Power Supply
Signal Processing Circuitry
2. MAINTENANCE AND SERVICE Preventive Maintenance
Replacement of Components on Printed Circuit Boards
Troubleshooting 1C Opamps Factory Service Shipping Instructions
3. CIRCUIT DESCRIPTION (With Troubleshooting Hints) Input
Buffer Signal Processing Power Supply
14 Appendix A: Specific Applications
Recording Studios Broadcasting Television Receivers Cable TV
15 Appendix 8: Interconnections And Grounding
Driving the 245F
From High-lmpedance And/Or High-
17 Appendix C: Specifications
18 PARTS LIST
22 PARTS LOCATOR