Orban OPTIMOD-FM 8700, Operating Manual

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OPTIMOD-FM DIGITAL INTRODUCTION
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
Subharmonic Synthesizer creates energy one octave below program energy in
the range of 50-90 Hz when such energy is not present at the input and when
music is detected.

Automatic Multipath Mitigator / phase skew corrector, when activated, removes
phase shifts between all elements in the input audio, converting the audio into
“intensity stereo.” By removing phase shifts between the left and right channels,
it minimizes the amount of energy in the stereo subchannel, which consequently
minimizes multipath distortion without compromising stereo separation.
This process can not only correct problems due to phase skew between the left
and right channels of an analog recording due to head gap misalignment, it can
also correct comb filtering caused by spaced microphones feeding the left and
right channels, which can occur on drum kits and other sources that have been
multi-miced.
The process also minimizes the amount of peak overshoot during SSB/VSB opera-
tion of the stereo encoder, thus minimizing the amount of composite limiting
needed to constrain peak modulation to 100%.
Controllable

The 8700i can be remote-controlled by 5-12V pulses applied to eight program-
mable, optically isolated GPI (general-purpose interface) ports.

The 8700i is equipped with a serial port to interface to an IBM-compatible com-
puter running Orban’s PC Remote software. The connection can be either direct
or through an external modem.

The 8700i has a second serial port that allows the user to set up security and
communications parameters through a simple ASCII terminal program running
on any PC.

The 8700i can be connected through its built-in 100 Mbps Ethernet port to a
TCP/IP network.

The 8700i includes a Telnet client that allows presets to be recalled via batch files
using the free PuTTY and Plink applications. The commands are simple ASCII
strings, facilitating interface to automation systems that can emit such strings
through an Ethernet or RS232 serial connection.

A built-in streaming server (supporting the MP3 and OPUS codecs) allows you to
stream any processed output (FM or HD) to a remote-control location to aid in
remote adjustment of the processing.

A Bypass Test Mode can be invoked locally or by remote control to permit
broadcast system test and alignment or “proof of performance” tests.