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Audessence AM PRO-1 AM Transmission Processor

 
  • Dale #:

    ADSS-AMPRO1
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Description

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... Read More

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Description

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).

BENEFITS:

  • Loud, clean audio for AM broadcasting
  • Handles speech just as well as music (not all digital audio processors manage this!)
  • Improves audibility and clarity of programme
  • Meets all national and international spectral occupancy and other specifications
  • Automatically adjusts levels if output from studio is too low

APPLICATIONS:

Audio processing for all AM broadcast applications:

  • LW
  • MW (AM)
  • SW/HF

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Product Specs

Frequency Response (All filters set for minimum action) DIGITAL-DIGITAL: 20Hz-9.75kHz +/-0.1dB
ANALOGUE-ANALOGUE: 30Hz-9.75kHz +/-0.5dB
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
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
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

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