AVT MAGIC ISDN, Hardware Description

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PA G E 5 1
T E C H N I C A L D A T A
A1.3 Analogue Unit for Audio Codec Layer II / III
Inputs Symmetrical, floating audio interface (XLR),
centre-tap earthing selectable,
Input impedance can be switched to 600
Ω
or 15k
Ω
Nominal level –6 dBu to +12 dBu,
(settable)
Headroom +6 dB
Auxiliary input
Impedance >12 k
Ω
Nominal level 9 dBu
Outputs Symmetrical, floating audio interface (XLR),
centre-tap earthing selectable,
Output impedance low-impedance < 20
Ω
Nominal level –20 dBu to +12 dBu,
(settable)
He6 dB
Auxiliary output
Impedance 600
Ω
Nominal level 9 dBu
Level monitoring
Inputs / outputs left channel, right channel
Threshold char. –12 dB below nominal level
Measures taken Alarm signal is output
Sampling frequencies 32-kHz; 44.1-kHz; 48-kHz
Equalisation Preemphasis none
Deemphasis To ITU-T J.17 or
50/15
µ
s
Frequency rangewithout coding 20 Hz to 20 kHz
with coding upper limit dependent on set data rate.
Typical examples:
approx. 20 kHz stereo for 192 kbit/s Layer III
approx. 15 kHz stereo for 128 kbit/s Layer III
approx. 15 kHz mono for 64 kbit/s Layer III
approx. 7kHz stereo for 64 kbit/s Layer III
Harmonic distortion K2 + K3
≤
0.025 %
Signal-to-noise ratio approx. 80 dB unweighted, referred to
maximum output level
Crosstalk (L
↔
R) approx. 80 dB (at f = 10 kHz)