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OPTIMOD-FM DIGITAL
Specifications apply for measurements from analog left/right input to stereo composite out-
put and to FM analog left/right output.
Frequency Response (Bypass Mode): Follows standard 50µs or 75µs pre-emphasis
curve ±0.10 dB, 20 Hz–15 kHz. Analog left/right output and digital output can be user-
configured for flat or pre-emphasized output.
Noise: Output noise floor will depend upon how much gain the processor is set for (Limit
Drive, AGC Drive, Two-Band Drive, and/or Multi-Band 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 15 kHz. <0.02% SMPTE IM Distortion.
Total System L/R Channel Separation: >50 dB, 20 Hz – 15 kHz; 60 dB typical.
Polarity (Two-Band and Bypass Modes): Absolute polarity maintained. Positive-going signal
on input will result in positive-going signal on output.
Processing Sample Rate: The 5500i is a ―multirate‖ system, using internal rates from 32
kHz to 512 kHz as appropriate for the processing being performed. Audio clippers oper-
ate at 256 kHz (and are anti-aliased), while the composite limiter operates at 512 kHz. In
stand-alone stereo encoder mode, minimum sample rate is 64 kHz.
Processing Resolution: Internal processing has 24 bit (fixed point) or higher resolution.
6-1
TECHNICAL DATA
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