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FM-531HD / May 2013
F M - 5 3 1 H D G U R U G U I
Sound Menu
Selecting the Sound
tab will reveal the ten controls of Guru GUI, six for FM and four
for HD. It is these simple to use but quite powerful controls that can morph the sound of
any Factory preset into over one million different sounds and textures.
There are two sections to the Sound screen. The left side contains the controls that
modify the sound of the FM signal path while the far right side hosts the controls for
adjusting the sound of the HD signal path. Note that the FM and HD signal paths share
the common five band AGC/SST structure so as to maintain a consistent spectral texture
as an HD receiver blends from analog to HD. The
AGC Depth and Compression sliders
are shared
between the FM and HD signal paths.
Each sound slider is intelligently connected to myriad controls (over 425) that are
accessible via the full‑control “Expert” level Professional GUI. As each Sound slider is
adjusted to the eleven positions within its 0 to 10 range, many complementary adjust
-
ments are occurring behind the scenes to modify the sound according to the naming and
purpose of the controls. The following is an explanation of what each FM Sound slider
control does, again keeping in mind that the
AGC Depth and Compression slider are
shared
between the FM and HD processing chains.
FM Sound Adjust
AGC Depth
The AGC Depth
control adjusts how deep the AGC’s
long term gain reduction will
be with typical program material and with appropriate input levels. Higher settings cause
deeper long‑term gain reduction and the additional “reserve” gain caused by raising the
setting of this control will tend to hold up fading songs longer. Conversely a lower set-
ting of the control causes gain reduction that is less deep, leaving less gain available to
hold up program levels of material (such as songs) as it fades.
Note that the
AGC Depth slider does not modify the time constants within the
AGC/SST section. That is the job of the Compression
slider, discussed next.
Compression
The Compression control adjusts the medium term program density and how obvious
the processing will sound. Lower settings cause the processing to be virtually inaudible
as it corrects levels and spectral balance as incoming program elements change. Adjust-
ing the slider to higher numbers makes the gain controlling action more audible. Higher
Compression settings also cause the audio to “fill up” and become more “full.”
Summary of Contents for FM-531 HD
Page 2: ...Technical Manual Wheatstone Corporation May 2013 FM HD Digital Audio Processor FM 531hd...
Page 122: ...page A 2 FM 531HD May 2013 A P P E N D I C E S Appendix A General Specifications A 3 Contents...
Page 128: ...page A 8 FM 531HD May 2013 A P P E N D I C E S Appendix B FM 531HD GPI Interface A 9 Contents...
