Description Specifications Audessence AM PRO-1 AM Digital Audio Processor. The Audessence AM PRO-1 is a complete air-chain audio processing system for AM radio stations. Adjustable input pre-filtering (lowpass and high-pass) pre-conditions audio to prepare for aggressive ‘brick-wall’ low-pass filtering later and avoids wasting modulation percentage on inaudible sub-bass components Unsurpassed Audessence AGC developed for the professional Audessence levellers keeps programme level as consistent as desired Programme compression, limiting, pre-emphasis and clipping for optimum loudness and coverage increase All this plus enhancement features for brightening and clarifying your programme.Adjustable Low-Pass filtering meets all international and national broadcasting specifications including ITU and NRSC (4kHz to 15kHz nominal). FEATURES: Complete digital air-chain processing for AM radio broadcasters in a compact package Adjustable input High-pass filter 3Hz to 200Hz Phase rotator to reduce programme asymmetry Advanced AGC as used in our ALPS levellers offers unsurpassed rapid control of levels Independent programme compression stage Presence enhancer to brighten programme and cut through noise Choice of pre-emphasis to meet national requirements including NRSC Adjustable low-pass filter for all applications Fco 4.5kHz to 10kHz Sophisticated peak control dramatically increases loudness without digital grunge Positive peak asymmetry up to 145% (where legal) Factory presets deliver exactly the results you need for any application …fast No-tamper front panel (set-up by PC only: GUI software, USB and RS-232 ports provided) Bright, Always-Visible LED bargraphs for audio confidence checks Low audio latency (4 milliseconds) Fast boot-up (<1 second). Frequency Response (All filters set for minimum action): DIGITAL-DIGITAL: 20Hz-14.9kHz /-0.1dB ANALOGUE-ANALOGUE: 20Hz-14.9kHz /-0.2dB Noise: DIGITAL-DIGITAL (rms 20Hz-20kHz): <-110dBFS ANALOGUE-ANALOGUE: (rms 20Hz-20kHz): <-75dB ref: Limit point 8dBu Distortion: DIGITAL-DIGITAL (6dB limiting): <-90dB / 0.003% THD ANALOGUE-ANALOGUE (6dB limiting): <-70dB / 0.03% THD Inputs: ANALOGUE: Active balanced, 10k (bridging), standard operating level -6dBu to 14dBu (clip 22dBu) DIGITAL: AES-3 (XLR); 32, 44.1, 48, 88.2, 96kHz sample rate. 16, 20, or 24 bits. Output: ANALOGUE: Active true balanced, standard operating level -6dBu to 21dBu DIGITAL: AES-3 (XLR); full input rate / half rate. Processing blocks: High-Pass: 3dB Frequencies 3Hz [DC block], 20Hz, 30Hz, 45Hz, 75Hz, 90Hz, 135Hz, 150Hz, 180Hz. Phase Rotator: Cancels asymmetry in certain programme material Gated AGC: Capture range 40dB ( /-20dB); maximum positive gain can be set. Advanced AGC enables faster, programme-dependent operation. Compressor: Nominal 2:1 slope Presence Enhancer: Boosts selected frequencies for intelligibility and / or brightness. Limiter: look-ahead limiters plus NCDCS anti-aliasing clipper. Low-Pass Filter: Cut-off frequency 4.5kHz, 5kHz, 5.5kHz, 6kHz, 7.5kHz, or 10kHz NRSC compliant HF Limiter: 50us or modified 75us (NRSC) emphasis curve Tilt Corrector: Reduce tilt due to LF problems in some transmitters. Increases loudness. Control: Setup is via PC GUI only. Select a factory preset, modify it, set levels etc, save to Flash memory. USB on front panel, plus RS-232 on rear panel. ASCII Text based command format. Choice of ‘Easy’ mode (simplified, with Wizard), or Expert mode for GUI control. Power: 100 – 240V AC Nominal (acceptable range 88V to 264V AC) / 6 Watts / 9VA. Dimensions & weight: 1-RU: 44 x 482 x 290mm deep / 1.75” x 19” x 11.25” deep. Weight: 1.8kg / 4lbs Computer Control: Every processing parameter, including all thresholds and time constants, can be accessed and modified under PC control (GUI included). Warranty: 3 year return-to-base warranty Approvals: CE (EMC & LVD), RoHS
