The OMB COM LIM 20 audio processor is the combination of a professional digital stereo generator (with more than 60dB channel separation) and a high-dynamic limiter, with stop band rejection higher than 90dB above 75KHz. A 4-band equalizer is integrated, too. All these advanced characteristics give the COM LIM 20 an outstanding range of professional features, really useful in radio studios. It also includes RDS/RBDS digital encoder, and programming, visualization and control trough LCD display.

GENERAL CHARACTERISTICS

• WEIGHT 4.5Kg approximately
• DIMENSIONS 1 standard rack unit of 19”, 352x483x44mm
• AC RATE 220VAC/110VAC
• PRESET CURVES 30, factory programmed

ANALOG STEREO AUDIO INPUT

• CONVERSION 24bit
• CONNECTOR TYPE XLR (F) el. Balanced
• MAX. INPUT LEVEL +20dBu
• LEVEL RANGE -12dBu to 12dBu (1dB steps)
• IMPEDANCE 600 Ohm/10Kω EMI – suppressed
• AGC RANGE ±20dB (relative sensibility)

DIGITAL AUDIO INPUT (OPTIONAL)

• CONNECTOR TYPE XLR el. Bal. + optical Tos link
• FORMATS AES/EBU, SPDIF
• SAMPLING RATES 32KHz/44.1KHz/48KHz/96KHz
• CONFIGURATION Automatic selection and jitter correction
• INPUT SENSIBILITY 200mVpp
• AGC RANGE 0 to -20dBF

AGC OPERATION

• AGC SPEED 0 to 6dB/sec. (adjustable - 0.2dB steps)
• AGC HOLD TIME Selectable, from 0 to 3 seconds
• AGC MAX. GAIN Selectable 8, 10, 12, 15 or 20dB

PROCESSING

• Nº OF BANDS 4
• Nº OF PRESETS 30
• BASS COMPRESSOR THR: related to the chosen preset ATCK. Time: 80ms, REL Time: 250ms, Compression Ratio: 1: INF
• MID COMPRESSOR THR: related to the chosen preset ATCK. Time: 30ms, REL Time: 90ms, Compression Ratio: 1: INF
• HIGH COMPRESSOR THR: related to the chosen preset ATCK. Time: 10ms, REL Time: 50ms, Compression Ratio: 1: INF
• BROAD BAND LIMITER ATCK Time: 5ms, REL Time: 50ms. Applied to high frequencies band
• DYNAMIC EXPANDER (NOISE GATE) Gate threshold adjustable between -51dB and -80dB. Expansion ratio 2:1 (fixed)

STEREO AUDIO OUTPUT (ST VERSION ONLY)

• CONNECTOR TYPE XLR (M) el. balanced
• CONVERSION 24bit
• IMPEDANCE 600 Ohm/10kOhm EMI – suppressed
• LEVEL -10dBm to +14dBm (0.5dBm steps)

REMOTE CONTROL

• SERIAL PORTS 2 RS232 Sub D 9P optically decoupled
• BAUD RATE 19200 Baud

LOW PASS 15KHz INPUT FILTER

IIR 8th ORDER ELIPTIC, 15KHz/-0.1dB, 17KHz/-60dB

BY-PASS MODE (AGC Off, Gain Ofst 0dB, Out Lvl 0dB)

• FREQUENCY RESPONSE 30Hz-15KHz (±0.1dB)
• OUTPUT NOISE -90dB (A-weighted)
• THD 0.01%
• PASS BAND RIPPLE ±0.1dB

SIGNAL PROCESS FILTERS

• LP 400Hz IIR 2º Order-Butterworth
• BP 400Hz-5KHz IIR 4º Order-Butterworth
• BP 5KHz-15KHz IIR 4º Order-Butterworth
• HIGH FREQUENCY DENOISER Threshold adjustable -51 to -80dB

MPX OUTPUT (FM VERSION ONLY)

• CONVERSION 24bit
• PILOT FREQUENCY 19KHz ± 1Hz
• PILOT INJECTION -15.5 to -25.0dB (0.1dB steps, from 5.6% to 16.8%)
• PILOT PHASE Adjustable ±12 degrees (1dB steps) S/N >85dB
• STEREO SEPARATION 55dB typical on the whole band
• CROSSTALK M/S 60dB
• CROSSTALK S/M 60dB 38KHz SUPPRESSOR Less than measurable level
• MPX OUTPUT LEVEL -9dBm to +15dBm (0.1dBm steps)
• OUTPUT IMPEDANCE 600 Ohm
• OUTPUT CONNECTOR BNC floating over chassis, EMI supp.
• PILOT REF. OUTPUT TTL level wave
• PRE-ENPHASIS 50/75 usec.

AUX INPUT (1 Y 2) (MPX VERSION ONLY)

• CONNECTOR TYPE Floating BNC, EMI suppressed
• INPUT LEVEL -40 to 0dB
• IMPEDANCE 10 KOhm
• PURPOSE SCA, RDS inputs

CODER RDS/RBDS (FM VERSION ONLY)

• SUPPORTED STANDARDS RDS (RADIO DATA SYSTEM) according to standard CENELEC EN50067; RBDS (RADIO BROADCAST DATA SYSTEM) according to standard NRSC
• STANDARD CODING METHODS PI, TP, TA, M/S, RT, PSN, PTY, DI, AF (8 lists)
• CUSTOM CODING METHODS PS Sequence (up to 8 messages), PS Scrolling (up to 32 characters)
• RDS SUBCARRIER FREQUENCY 57KHz ±3Hz
• RDS OUTPUT LEVEL Adjustable from -44dB to -20dB (0.1dB steps)
• SYNCHRONIZATION To internal 19KHz pilot tone