The RB-DSD1 digital silence detection unit works in a similar way to the Sonifex RB-SD1 analogue silence detection unit, but has AES/EBU, S/PDIF and TOSlink inputs and outputs instead of analogue inputs and output respectively. Designed to switch from one input to another in the event of loss of audio, the unit is ideal at transmitter sites, or after the master output of a studio, to switch in another audio source, or simultaneous broadcast, should a master source fail.
The unit can switch:
- On loss of level of the main input.
- On loss of level on one channel of the main input.
- On loss of synchronisation lock of the main input.
The RB-DSD1 has 2 x digital stereo audio inputs, each one selectable via front panel INPUT1 and INPUT 2 push buttons, from either AES/EBU balanced XLRs, S/PDIF unbalanced phonos or TOSlink unbalanced optical inputs. Sample rate converters on each input mean that sources of different sample rates can be used with the output sample rate being defined independently. Each input is user-defined as either the main source or auxiliary source and both sources are monitored for failure, each having a remote failure alarm. The colour of the INPUT 1 and INPUT 2 push-buttons indicate which input is the main (green) and auxiliary (red) input, with a flashing LED indicating loss of synchronisation.
In the event of the main source dropping below a pre-set level for a pre-determined amount of time, the unit will automatically switch through to the auxiliary signal. The silence detect level is adjustable between -39dBfs and -84dBfs in 3dBfs steps via front panel DIP switches. The silence interval can be adjusted between 0 seconds and 252 seconds in 2 second steps via another front panel DIP switch block. A small cover panel can be screwed in place to obscure the DIP switches to prevent tampering of the settings.
There are 2 stereo outputs to allow for distribution of the selected input to multiple outputs. Each output is available as simultaneous AES/EBU balanced XLRs, S/PDIF unbalanced phonos or TOSlink unbalanced optical outputs. The output sample rates are selectable via rear panel DIP switches from one of 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz.
The unit has TTL wordclock BNC and AES/EBU XLR synchronising inputs as standard and optionally, the RB-SYA and RB-SYD synchronisation boards can be fitted to synchronise the unit to analogue or digital video signals. A front panel DIP switch block is used to decide whether the unit is synchronised to Input1, Input2, the AES/EBU sync input, the wordclock sync input or an optional video sync board. A front panel SYNC button selects the synchronisation mode of the unit and the button flashes whenever the unit is not synchronised to an incoming sync signal.
Audio Specification Dynamic Range: >138dB Distortion and Noise: <-137dB THD + N at 1kHz, ref 0dB FS Input & Output Impedances: 110Ω ±20% AES/EBU balanced I/O 75Ω ±5% S/PDIF unbalanced I/O 75Ω ±5% TOSlink unbalanced I/O 50Ω BNC TTL word clock input Signal Level: Balanced: 3V/10V peak to peak min/max Unbalanced: Min 0.5V±20% peak to peak Sample Frequencies: 32, 44.1, 48, 88.2, 96,176.4 or 192kHz Bit Depth: Up to and including 24 bit Front Panel Operational Controls & Indicators Digital Input Select: AES/EBU, S/PDIF or TOSlink optical via INPUT 1 or INPUT 2 push-buttons Sync Input Select: AES/EBU, wordclock, INPUT 1, INPUT 2 or video board, via front panel DIP switch Sync Mode Select: Master, slave, auto or auto lock, via SYNC push-button Alarm Threshold: -39dBfs to -84dBfs in 3dBfs steps via front panel DIP switches Silence Detect Duration: 0 - 252 seconds in 2 second intervals via front panel DIP switches Detection Type: Mono or stereo, via front panel DIP switch Restore Control: Manual restore button & mode indication LED Indicators: Program and alarm indicators for left and right sources for both main and auxiliary inputs Rear Panel Operational Controls Master Frequency Select: 32, 44.1, 48, 88.2, 96,176.4 or 192kHz via rear panel DIP switches Input Select: Main input from INPUT 1 or INPUT 2 via DIP switch Restore Mode: Automatic or manual, via DIP switch Remote Start: Latched or momentary, via DIP switch Channel Loss: Mute channel or mix remaining, via DIP switch Sync Loss: Switch immediately or treat as silence delay, via DIP switch Connections Digital Inputs: 2 x AES/EBU XLR 3 pin female 2 x S/PDIF RCA phono 2 x TOSLink optical input Digital Outputs: 2 x AES/EBU XLR 3 pin plug 2 x S/PDIF RCA phono socket 2 x TOSLink optical output Sync Inputs: 1 x AES/EBU XLR 3 pin female 1 x Word Clock BNC 1 x Video Input (optional) Remote I/O Port: 15 way D-type plug Serial Port: RS232, 9 way D-Type Mains Input: Universal filtered IEC, continuously rated 85-264VAC @47- 63Hz, max 10W Fuse Rating: Anti-surge fuse 1A 20 x 5mm Equipment Type RB-DSD1: Digital silence detection unit Physical Specifications Dimensions (Raw): 48cm (W) x 10.8cm (D*) x 4.2cm (H) (1U) 19” (W) x 4.3” (D*) x 1.7” (H) (1U) Dimensions (Boxed): 59cm (W) x 27.5cm (D) x 11cm (H) 23.2” (W) x 10.8” (D) x 4.3” (H) Weight: Nett: 1.4kg Gross: 2.0kg Nett: 3.1lb Gross: 4.4lb Accessories RB-SYA: Analogue video sync board (NTSC, PAL & SECAM) RB-SYD: Digital video sync board (SD-SDI & HD-SDI) RB-RK3: 1U Rear panel rack kit for large Redboxes * Note that this product is deeper than standard Redboxes
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