Inovonics 261 Stereo Leveler - Limiter

Sound Processing
Inovonics
Inovonics 261 digitale Audio processor biedt de lokale of regionale omroep een eenvoudige, economische en onopvallende oplossing voor het normaliseren en controleren van geluidsniveaus en is volledig digitaal.
1.499,00 Excl. BTW
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Inovonics 261 Stereo "Utility" Processor & Leveler

GATED AGC, DYNAMIC RANGE COMPRESSION, TIGHT PEAK CONTROL AND
PRE-EMPHASIS-PROTECTION


Inovonics' DSP-based 261 affords the broadcaster a simple, economical and unobtrusive means of normalizing and controlling audio levels in an all-digital or mixed-signal plant.Revision 2 firmware makes the 261 a comprehensive processing system.
It combines gated, gainriding AGC, program dynamic range compression, final wideband peak limiting and an independent high-frequency 'pre-emphasis-protection' limiter.
Intuitive menu-driven setup configures the 261 to provide any basic processing function separately, or can combine all options to give total program audio control. The 261 is ideal for link and uplink protection, LPFM and similar applications.

Now with Rev. 2 firmware,* the 261 'Utility' Processor becomes an all-inclusive system for general audio normalization and FM-airchain use.
It combines the functions of gated, gain-riding AGC, dynamic range compression and independent broadband and high-frequency program peak limiting. Processing functions may be selected separately or combined for comprehensive program audio control. Menu-driven DSP architecture ensures easy setup and unobtrusive operation. The 261 has AES-digital and L/R analog inputsdigital and analog outputs are available simultaneously.

AGC CAPTURE RANGE:
30dB nominal capture range (±15dB) with menu-programmed control over maximum (positive) AGC gain from 15dB to 0dB.
AGC has selectable 'slow' and 'fast' correction rates.

DYNAMIC COMPRESSION:
Compression of program dynamics is afforded by a timedomain "platform" function associated with the broadband peak controller.
Additional circuit gain is imparted when this
function is enabled, increasing the average value of the program by as much as 6dB, depending on the average/ peak ratio of the source material.

BROADBAND PEAK CONTROL:
The look-ahead limiter has program-controlled attack and release timing that has been optimized for unobtrusive operation. Program peaks are held at an absolute
'ceiling' value without the need for flat-topped clipping.

HIGH FREQUENCY LIMITER:
An independent HF limiter selectively controls the preemphasized portion of the 50&mus or 75&mus FM transmission characteristic.
In addition to menu selection of the
appropriate curve, either a normal 'flat' output or a preemphasized output may be selected.

ALARMS:
A front-panel flashing display and open-collector NPN transistor 'tally' outputs signal INPUT OVERLOAD, AGC OUT-OF-LIMITS or PROGRAM AUDIO LOSS conditions.

Highlights
*Pre-emphasis protection limiting with Rev. 2 firmwareideal for LPFM.
*AGC, compression, wideband and high-frequency limiting.
*Remote alarms for audio loss and out-of-limits operation.
An all-digital design using proven DSP
technology with 32-bit architecture.
- Fast menu-driven setup with an easy-to-read
LCD display. A minimalist approach to user
controls assures positive, repeatable presets.
- Accepts both analog and digital program inputs and provides both analog and digital outputs simultaneously.
- 'Look-ahead' final limiting eliminates the need for flat-topped clipping of program audio to define an absolute ceiling value.
- Rear-panel tallies enable remote alarm indication.
FREQUENCY RESPONSE
±0.25dB, 20Hz-20kHz at 44.1kHz and 48kHz sampling rates.
±0.25dB, 20Hz-15kHz at 32kHz sampling rate.

NOISE
  • Digital I/O: Better than 120dB below limiter ceiling, 20Hz-20kHz.
  • Analog I/O: Better than 75dB below limiter ceiling, 20Hz-20kHz.

DISTORTION
<0.01%THD below limiting threshold.
Limiter self-modulation distortion is an inverse function of frequency; <0.1%THD at 100Hz, <0.5%THD at 50Hz.

CROSSTALK
  • Digital Digital I/O: Better than 120dB between channels
  • Analog I/O: Better than 65dB between channels

PROGRAM LINE INPUTS
  • Digital: AES/EBU (XLR) input accepts 16-, 20-, or 24-bit inputs at sampling rates of 32kHz, 44.1kHz and 48kHz
  • Analog: Active-balanced, bridging (XLR) inputs acceptnominal program line levels between –15dBu and 15dBu
  • Input Gain: Menu-controlled over a 20dB range

PROGRAM OUTPUTS
  • Digital: The AES/EBU (XLR) output syncs to the rate of the input program when the digital input is selected, or may be set to a 32kHz, 44.1kHz or 48kHz output rate when analog program inputs are used
  • Analog: Active-balanced (XLR) outputs may be adjusted by menu selection for a nominal line level between –10dBm and 10dBm
  • Output Level: Menu-adjustable over a 20dB range
  • Latency: 4.5ms

AGC CAPTURE RANGE
30dB nominal capture range (±15dB) with menu-programmed control over maximum (positive) AGC gain from 15dB to 0dB. AGC has selectable ‘slow’ and ‘fast’ correction rates.

DYNAMIC COMPRESSION
Compression of program dynamics is afforded by a timedomain “platform” function associated with the broadband peak controller. Additional circuit gain is imparted when this function is enabled, increasing the average value of the program by as much as 6dB, depending on the average/ peak ratio of the source material.

BROADBAND PEAK CONTROL
The look-ahead limiter has program-controlled attack and release timing that has been optimized for unobtrusive operation. Program peaks are held at an absolute ‘ceiling’ value without the need for flat-topped clipping.

HIGH FREQUENCY LIMITER
Emphasized portion of the 50μs or 75μs FM transmission characteristic. In addition to menu selection of the appropriate curve, either a normal ‘flat’ output or a preemphasized output may be selected.

ALARMS
A front-panel flashing display and open-collector NPN transistor ‘tally’ outputs signal INPUT OVERLOAD, AGC OUT-OF-LIMITS or PROGRAM AUDIO LOSS conditions.

POWER REQUIREMENTS
105-130VAC and 210-260VAC; 50/60Hz; 20W.

SIZE AND SHIPPING WEIGHT
23” x 16” x 2” (2U); 8 lbs
584mm x 406mm x 51mm ; 3.6 kg 
Inovonics 261 Digital Audio Processor Datasheet