The DCO-1741/1781 is a 2/4 AES change-over. The switch is performed electronically by an internal router. In the event of a power failure, the signal is protected by the relays fitted on the rear module, maintaining the integrity of the selected signal at the output....
Miranda DCO-1781 4 AES audio change-over with optional silent switch - DCO-1781
The DCO-1741/1781 is a 2/4 AES change-over. The switch is performed electronically by an internal router. In the event of a power failure, the signal is protected by the relays fitted on the rear module, maintaining the integrity of the selected signal at the output. The DCO card allows switching as a regular router, or alternatively the module can perform an audio silent switch between sources using the silent switch software option. Input selection can be performed manually or automatically.
Key Features
Up to 4 AES on each input
Electronic switching with relay backup (on rear module)
Automatic mode using internal signal analysis with alarm parameters
Manual change-over by local frame controller, iControl, iControl Solo or GPI
GPI outputs give status of selected source for tallies
Alarm reporting to iControl facility monitoring and control system
GPI I/O (IN1, IN2, AUTO, BYPASS)
Optional silent switch function
Frame reference input
Audio level meter streaming
Emergency audio tone
Specifications
AUDIO INPUTS (4 AES per input)
Sampling freq.: 48 kHz ±100 ppm
Quantization: 16 to 24 BITS
All A inputs must be synchronized with each other.
All B inputs must be synchronized with each other.
AES3
Level: 0.2 to 7 Vp-p
Impedance:
Transformer balanced
110Ω (bypass off)
>5 kΩ (bypass on)
AES3-id
Level: 0.2 to 2 Vp-p
Impedance:
75Ω (bypass off)
>5 kΩ (bypass on)
Return loss: >15 dB up to 12 MHz
AUDIO OUTPUT (4 AES)
Sampling freq.: 48 kHz ±100 ppm
AES3
Level: 4 Vp-p
Impedance: 110Ω balanced
AES3-id
Level: 1 Vp-p
Impedance: 75Ω
Return loss: >15 dB up to 12 MHz
REFERENCE INPUT
Signal: URS for Densité
PROCESSING PERFORMANCE
Quantization: 24 bits
Sampling: 48 kHz, synchronous
Number of channels: 8
Latency:
3 audio samples
40 ns (direct mode)
ALARM PARAMETERS
AES audio alarm
AES carrier
No Lock
Parity
CRCC
Validity
Not 48 kHz
Audio type
PCM
Dolby-E
Dolby Digital AC 3
Non PCM
Overload
Level
Max
Min
Silence
Overload
Dynamic
Low dynamics
AES imbalance
AES phase
AES stereo width
Metadata
Program config
Dialnorm
MISCELLEANEOUS
Tone generator: 1 kHz sine wave interrupted on left channels (250 ms / 3s) EBU R49
Emergency audio clip: storage provided for one or two files, with a total duration from 11.3s (for stereo signal sampled at 48 kHz) to 45s (for mono signal sampled at 24 kHz)