OPTIMOD-AM DIGITAL TECHNICAL DATA
6-1
Section 6
Technical Data
Specifications
It is impossible to characterize the listening quality of even the simplest limiter or
compressor based on specifications, because such specifications cannot adequately
describe the crucial dynamic processes that occur under program conditions. There-
fore, the only way to evaluate the sound of an audio processor meaningfully is by
subjective listening tests.
Certain specifications are presented here to assure the engineer that they are rea-
sonable, to help plan the installation, and make certain comparisons with other pro-
cessing equipment.
Performance
Except as noted, specifications apply for measurements from the analog left/right input to
the analog left/right output.
Frequency Response (Bypass Mode): ±0.2 dB, 50 Hz–15 kHz, or as determined by user-
settable high-pass filter in the active transmission preset.
Noise: Output noise floor will depend upon how much gain the processor is set for (Limit
Drive, AGC Drive, Two-Band Drive, and/or Multiband Drive), gating level, equalization,
noise reduction, etc. The dynamic range of the A/D Converter, which has a specified
overload-to–noise ratio of 110 dB, primarily governs it. The dynamic range of the digital
signal processing is 144 dB.
Total System Distortion (de-emphasized, 100% modulation): <0.01% THD, 20 Hz–1 kHz,
rising to <0.05% at 9.5 kHz. <0.02% SMPTE IM Distortion.
Polarity: The processing employs phase rotation to maximize loudness. Therefore, the po-
larity is frequency-dependent.
Processing Sample Rate: The 9300 is a “multirate” system, using internal rates from 32
kHz to 128 kHz as appropriate for the processing being performed. Audio clippers oper-
ate at 128 kHz.
Processing Resolution: Internal processing has 24 bit (fixed point) or higher resolution;
uses Motorola DSP56362 DSP chips.
Low-Pass Filter: 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, or 9.5 (NRSC) kHz as set by
user. Unit can be set up to comply easily with ITU-R and NRSC spectrum masks. Low-
pass filter shape is parametric and can be set to be –0.1, –3, or –6 dB down at the cutoff
frequency (see Figure 2-7 on page 2-23).
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