OPTIMOD-FM DIGITAL
OPERATION
3-53
helps prevent distortion in the final clipper when the input program material con-
tains excessive energy above 6 kHz.
The Band 5 multiband clipper operates at 256 kHz and is fully anti-aliased.
Advanced Multiband Controls
The following Advanced Multiband controls are available only from 8300 PC Remote
software.
Bx On / Off
switches allow you to listen to any band (or any combination of bands)
independently. This is a feature designed for intermediate or advanced users and
developers when they are creating new 8300 presets.
Please note that a single band will interact with the back-end clipping system quite
differently than will that band when combined with all of the other bands. There-
fore, do not assume that you can tune each band independently and have it sound
the same when the clipping system is processing all bands simultaneously.
Lookahead
activates or defeats the look-ahead functionality in the multiband
compressor / limiter. Defeating look-ahead improves transient impact at the expense
of distortion, particularly on speech. To mitigate this tradeoff, a selectable “auto”
mode turns look-ahead on for speech material and off for music, using an automatic
speech/music detector. Switching is seamless and click-free because we change the
delay in the compressor control sidechains; this is not a way to reduce the 8300’s
throughput delay.
Choices are
L
OOKAHEAD
I
N
,
O
UT
,
and
A
UTO
.
Speech is detected if (1) the input is mono, and (2) there are syllabic
pauses at least once every 1.5 seconds. Speech with a stereo music back-
ground will usually be detected as “music,” or the detector may switch
back and forth randomly if the stereo content is right at the stereo /
mono detector’s threshold. Mono music with a “speech-like” envelope
may be incorrectly detected as “speech.” Music incorrectly detected as
“speech” will exhibit a slight loss of loudness and punch, but misdetec-
tion will never cause objectionable distortion on music.
Speech that is not located in the center of the stereo sound field will al-
ways be detected as “music” because the detector always identifies ste-
reo material as “music.” This can increase clipping distortion on such
speech.
If the
B
ASS
C
LIP
M
ODE
is set to
H
ARD
, the speech/music detector will auto-
matically set it to
M
EDIUM
when speech is detected and
H
ARD
otherwise
(unless
L
ATENCY
is
L
OW
, in which case
M
EDIUM
bass clipping is unavailable
and bass clipping will stay
H
ARD
).
Speech always sounds cleaner with
M
EDIUM
bass clipping and the in-
creased bass “punch” supplied by
H
ARD
is irrelevant to speech.
This control does not affect the HD processing chain.
B1-B4 Attack (Time)
controls set the speed with which the gain reduction in each
band responds to level changes at the input to a given band’s compressor. These
Summary of Contents for 8300J
Page 1: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 7: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 24: ......
Page 94: ...2 46 INSTALLATION ORBAN MODEL 8300 This page intentionally left blank...
Page 190: ......
Page 204: ......
Page 246: ......
Page 247: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 29...
Page 254: ...6 36 TECHNICAL DATA ORBAN MODEL 8300 CPU Module...
Page 260: ...6 42 TECHNICAL DATA ORBAN MODEL 8300 8300 RS232 BOARD PARTS LOCATOR...
Page 262: ...6 44 TECHNICAL DATA ORBAN MODEL 8300 8300 POWER SUPPLY PARTS LOCATOR...
Page 264: ...6 46 TECHNICAL DATA ORBAN MODEL 8300 8300 I O BOARD PARTS LOCATOR...
Page 270: ...6 52 TECHNICAL DATA ORBAN MODEL 8300 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 278: ...6 60 TECHNICAL DATA ORBAN MODEL 8300 8300 DISPLAY BOARD PARTS LOCATOR...
Page 279: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...