MIRAGE MK III - Broadcast Audio Processor
AEV Broadcast Srl via della Tecnica 33, 40050 Argelato Bologna ITALY
www.aev.eu
10
Best location for MIRAGE
The best location to install MIRAGE is as close as possible to the transmitter, in such a way
that the stereo encoder output can be routed to the transmitter.
The buffered outputs of the MIRAGE can drive an encoder via upto 10m of cable without
causing any appreciable degradation to the signal.
Should the output of the MIRAGE require a cable longer than the one that is recommended,
the best solution is to install an external encoder close to the exciter of the transmitter and
feed it directly from the Left and Right analog outputs of the MIRAGE.
To guarantee the maximum transmission quality, all apparatus used downstream of the
STUDIO should be carefully aligned and should conform to appropriate standards for
bandwidth, distortion, signal path delays and gain stability.
Such equipment should be re-calibrated at regular intervals; the signal source should be
lownoise, have as flat a frequency response as possible from 30 - 15,000 Hz and have a low
content of non-linear distortion.
Technical Specification
Frequency response:
30 Hz ÷ 15 KHz ± 0,3 dB (By-pass)
AGC Control:
± 10 dB
Stop Band Rejection:
> 90 dB above 75 KHz
Noise:
Output noise depends by processing parameters; AGC, threshold,
gain and density Greater than 84 dB Din Audio (By-pass).
Total distortion @ 1 KHz:
Than less 0,05%
Crosstalk L/R R/L:
Greater than 60 dB Din Audio (90 dB @ 3 KHz).
AUDIO INPUT
Configuration:
Left and Right
Impedance:
10 K
Ω
electronically balanced
Input level:
- 20 ÷ +10 dBm
Common-mode rejection:
Greater than 50 dB, (30 ÷ 15.000 Hz)
C
ONNECTORS
:
XLR
TYPE
-
FEMALE
PIN 1 G
ND
, PIN 2 I
NPHASE
, PIN 3 R
ETURN
P
IN
2
AND
3
ELECTRONICALLY BALANCED
Attention All cables should not be more than 3 meters length
AUDIO OUTPUT
Configuration:
Left and Right, Flat,
Pre-enphasized or De-enphasized (50 o75mS).
Impedance:
100
Ω
electronically balanced
Output level:
0 ÷ +12 dBm
C
ONNECTORS
:
XLR
TYPE
-
FEMALE
PIN 1 G
ND
, PIN 2 I
NPHASE
, PIN 3 R
ETURN
P
IN
2
AND
3
ELECTRONICALLY BALANCED
STEREO ENCODER ( * )
Configuration:
1 Output with level control
Pilot frequency:
19 KHz ± 0,001 % max over temp.
Pilot injection:
4 ÷ 12 % adjustable
Distortion @ 1 KHz:
Less 0,005 %
Signal-to-Noise ratio:
Greater than 92 dB DIN AUDIO
Stereo separation:
Greater than 60 dB 30 ÷ 15 KHz (70 dB @ 1 KHz)
Crosstalk Main to Sub:
Greater than 45 dB 30 ÷ 15 KHz (75 dB @ 1 KHz)
Crosstalk Sub to Main:
Greater than 40 dB 30 ÷ 15 KHz (75 dB @ 1 KHz)
38 KHz subcarrier suppression:
Greater than 80 dB
76 KHz and sideband suppression:
Greater than 90 dB
Composite output level:
0 ÷ + 12 dBm
