Orban OPTIMOD-FM 8700, Operating Manual

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OPTIMOD-FM DIGITAL OPERATION
3-101
The 8700i’s “MX” technology peak limiter consists of two main stages—first, a pre-
limiter stage to control low frequency and high frequency peaks ahead of the main
peak limiter and then the main peak limiter, which uses various proprietary tech-
niques to control distortion, minimize transient loss, and minimize high frequency
loss.
Figure 3-9
U2, “Within You Without You”
Measurements
The improved performance of the MX peak limiter can be verified by objective
measurements with real-world program material. To measure the improvements in
high frequency power handling capability and dynamic distortion, we use a Stanford
Research Systems SR785 Two-Channel Dynamic Signal Analyzer (Figure 3-13 on page
3-105) to compare the 8500 and 8700i. This analyzer has two filterbanks
3
and allows
the two third-octave or twelfth-octave spectra (measured in decibel units) to be sub-
3
ANSI standard S1.11- 1986, Order 3, Type 1-D