OPTIMOD-AM DIGITAL
OPERATION
3-57
processing chain, or the analog processing chain output signal. In the latter case, the
right-hand meter reads negative peaks of the higher of the two stereo channels and
the left-hand meter reads the higher of the positive peaks.
This switch applies only to the 9400’s front panel meters. 9400 PC Remote
displays all meters simultaneously.
The digital radio look-ahead limiter is not stereo-coupled. This prevents
limiting on one channel from causing audible modulation effects on the
other channel.
Analog Outputs
Out Source
determines if its associated analog stereo output pair (Analog Output 1
or 2) receives the analog-AM-processed signal, the signal before the digital-channel
look-ahead limiter, or the final post-limiter digital-channel signal. The pre-limiter
signal has low delay and is suitable for driving talent headphones.
Out Level
determines the peak output level (in dBu) of its associated analog out-
put.
Digital Outputs
Out Source
determines if its associated AES3 digital output (Digital Output 1 or 2)
receives the analog-AM-processed signal, the signal before the digital-channel look-
ahead limiter, or the final post-limiter digital-channel signal. The pre-limiter signal
has low delay and is suitable for driving talent headphones.
Out Level
sets the level of its associated digital-channel output with respect to digi-
tal full scale.
Samp Rate
sets the output sample rate of a given AES3 output.
The 9400’s fundamental sample rate is always 32 kHz, but the internal sample rate
converter sets the rate at the 9400’s AES3 outputs. This adjustment allows you to en-
sure compatibility with downstream equipment requiring a fixed sample rate.
Word Leng
sets the word length (in bits) emitted from a given AES3 output.
The largest valid word length in the 9400 is 24 bits. The 9400 can also truncate its
output word length to 20, 18, 16, or 14 bits. Moreover, the 9400 can add dither. You
should set it to do so if the input material is insufficiently dithered for these lower
word lengths.
Dither
turns on or off addition of “high-pass” dither before any truncation of the
output word before a given AES3 output. It is usually appropriate to add dither be-
cause doing so will minimize distortion at low signal levels.
The amount of dither automatically tracks the setting of the
W
ORD
L
ENG
control. This first-order noise shaped dither considerably reduces added
noise in the midrange by comparison to white PDF dither. However,
unlike extreme noise shaping, it adds a maximum of 3 dB of excess total
noise power when compared to white PDF dither. Thus, it is a good com-
promise between white PDF dither and extreme noise shaping.
Summary of Contents for Optimod-AM 9400
Page 1: ...Operating Manual OPTIMOD AM 9400 Digital Audio Processor Version 1 2 Software...
Page 7: ...Operating Manual OPTIMOD AM 9400 Digital Audio Processor Version 1 2 Software...
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Page 261: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 29...
Page 267: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 35 CPU Module...
Page 273: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 41 RS232 BOARD PARTS LOCATOR...
Page 275: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 43 8300 POWER SUPPLY PARTS LOCATOR...
Page 284: ...6 52 TECHNICAL DATA ORBAN MODEL 9400 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 292: ...6 60 TECHNICAL DATA ORBAN MODEL 9400 DISPLAY BOARD PARTS LOCATOR...
Page 293: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...