Solidyne 562dsp, User Manual

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SOLIDYNE 562
dsp - broadcast digital processor Page 25
whose action soon is canceled by the multiband
processor (since it compresses what the equalizer
reinforces). The technique of Density EQ operates
in combination with the multiband compressor.
Therefore its adjustments are interactive.
Density EQ
works creating four floating
thresholds for the average sonorous energy
, in
four frequency bands: 80 Hertz, 400 KHz, 2 KHz
and 8 KHz. This equalization allows to obtain, still
in conditions of high loudness, a contour of
equalization based on the energy of bands
(instead of differences of relative gain between the
bands like in a conventional EQ).
To change a value, select a band and touch briefly
the JOG (note that the arrow becomes a pencil).
Turn the JOG to move the slider.
Moving a slider at top, this band is muted. It’s only
useful to make test and comparisons while you
make a program.
4.4.5.1 Bass Clipper (Punch)
This control changes the threshold of a low band
limiter. The change of this threshold allows to
brings “punch” to the music’s below 80 Hz.
Increasing this threshold you increases the bass
peaks, but not the general bass loudness in a
noticeable way. You must use a monitoring
system with good low response to hear this
adjustment.
Values over -4dB must be carefully tested
according to the music that your radio station
plays, so it can produce audible distortion with
some music’s styles. Please check the factory
presets as reference about the use of this control.
REMEMBER
•
Changes occurs in real time, that is to say, as you
modify the value, the change will be listened on the air.
4.4.5.2 Wide Band Limiter
(WB)
The final stage of processing is a
wide-band
limiter
, of instant attack, which controls ALL the
peaks that pass through the multi-band
compressors.
"WB" control allows you to define the recovery
time of WB Limiter. Vary fast recovery times (<10
mS) increase the loudness (overall in the
indication of the modulation meters) but generate
a sound more "harsh". Adjustments between 10
and 50 mS are no recommended.
From 50 mS and slower, obtains a warm sound
and good loudness.
The limiter works with a system of automatic gain
control (AGC) which reduces the gain in program
passages with high density of peaks. This avoids
excessive limiting of the signal.
4.4.6 SRS WOW
®
It’s an audio processing technology developed by
SRS Labs Inc. USA, international leader on
psychoacoustic processing. 562dsp incorporates
the SRS WOW
®
algorithms, providing:
•
Dynamic range improvement of high-compressed
signals
•
Stereo image widening
•
Low frequencies improvement, low frequency
bass perception is increased even in small
speakers
These audio enhancement features immerse the
listener into an engaging and powerful FM
transmission. SRS WOW
®
accomplishes this by
providing a panoramic three-dimensional audio
image while increasing perceived bass response
well beyond the low frequency limitations of the
receiver’s speakers. A specially useful feature
when listening in automobiles and portable
equipment with headphones. In comparison with a
conventional transmission, a radio station with
SRS WOW
®
processing appears to the listeners
with greater relief and loudness.
SRS WOW
®
combines several processes. Next
we will present a briefly description of each
process and its operating fundamentals.
To access the SRS WOW
®
screen you have to
select “Edit PGM” (in the Main Menu) and choose
3D and SRS TruBass
®
option from the processing
block diagram shown on screen. The next image
shows the SRS WOW
®
settings screen. Use as
reference for the following explanations.