Sample Rate Converter
The Sonifex RB-SC1 is ideal for the transfer of digital audio between different digital equipment, the sample rate of a digital audio signal to one of 32kHz, 44.1kHz, 48kHz or 96kHz, or to a synchronising input. Both audio inputs and outputs have push-button switches to select either AES/EBU or S/PDIF. The synchronising input can be selected from one of AES/EBU, S/PDIF or TTL word clock.
There are four modes of operation of the RB-SC1 dependent on how you want to synchronise the output to the input :
In this mode, the digital output sample rate is simply set by, and locked to the internal on-board clock generator. No sync signal is used or required.
Auto Sync Mode
In this mode, the digital output sample rate follows the sync input. When the sync signal is not present the output sample rate will be set by and locked to, the internal onboard clock generator at a frequency determined by the switch position.
Auto Lock Mode
In this mode, no output will be generated until lock is achieved with a sync signal. The digital output sample rate now follows the sync input. If the sync signal is removed then the output sample rate will be set by and locked to, the internal on-board clock generator at the closest frequency available to the previous sync input.
In this mode, the digital output sample rate follows the sync input. When the sync signal is not present the digital output is turned off.
There are also switches available to define the content of the channel status bits embedded within the digital audio stream. The channel status bits will be forced to Professional Mode for sample rates above 48kHz as they are not supported by the Consumer Mode. For sample rates of 32kHz, 44.1kHz and 48kHz, the status bits can be either set to follow the input signal type or can be forced to either Professional or Consumer Mode.
As well as indicating that power is present on the unit, the LED on the front panel has a secondary role to indicate the status of the digital inputs. Fast flashing between red and amber indicates a loss of a digital input signal and slow flashing between red and amber indicates the absence of a synchronising input when not in Master Mode.
RB-SC2 Dual Sample Rate Converter
The RB-SC2 sample rate converter is a 1U rack-mount that produces AES/EBU, S/PDIF and TOSlink optical level digital audio outputs from balanced AES/EBU, S/PDIF and TOSlink optical level digital audio inputs. The sample rate of the outputs can be set by an internal clock or from various external synchroniser sources.
For the digital outputs, there are three push-button switches to select the sampling frequency (FREQUENCY), channel status bit type (CS DATA), and sync source and mode of operation (SYNC).
The FREQUENCY button allows selection of the master sample frequency from one of 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz. The CS DATA button defines the content of the channel status bits embedded within the digital audio stream and can be forced to either Professional Mode (PRO), Consumer
Mode (CON) or to follow the mode of the input (FOLLOW).
The SYNC button is used to select the synchronisation input, from the AES/EBU sync input, the Wordclock input or, for X-Lock, the other digital input. The X-Lock synchronisation allows the unit to act as a bi-directional sample rate converter with the output of sample rate converter 1 syncing the input of sample rate converter 2 and vice versa so that they follow each other.
The application for the X-Lock mode is so that the RB-SC2 can be inserted between 2 digital devices which run at different sample rates, such as a PC recorder and a digital player. Using the RB-SC2 in X-Lock mode ensures that the 2 devices remain synchronised at all times regardless of the sample rate of the 2 devices.
The SYNC button will also select the operating mode of the unit as described below. If an optional video sync board is fitted then 2 sync LEDs light together to show the active video sync.
In this mode, the unit receives a digital audio signal, which is passed to the sample rate converter and then re-formatted for the digital serial transmitter (IEC958). The sample rate converter clock signal is generated internally from an onboard master clock at a selectable rate (32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz).
In this mode the unit is synchronised to an external source, using the digital audio sync, or to the TTL level Word Clock. The FREQUENCY LED will indicate the synchronised sample frequency and if no sync is present, no output will be generated.
Here, the unit is synchronised to an external source, using the digital audio sync, or to the TTL level Word Clock. If no sync signal is present the unit runs from the onboard master clock at a rate selected by the front panel control (32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz).
Auto Lock Mode
This operates like the auto mode except that if no sync signal is present the unit will run at the closest master clock rate to the last locked incoming signal. The FREQUENCY LED will indicate the synchronised sample frequency.
When operating in sync modes, the SYNC button flashes whenever the unit is not synchronised to the incoming sync signal.
There are 2 further push-button switches (INPUT 1 & INPUT2) that are used to select the input connector used for each of the 2 sample rate converter circuits. These switches select between AES/EBU, S/PDIF and TOSLink optical connectors. A red LED indicates when power to the RB-SC2 is on.
- It supports higher sample frequency rates up to and including 176.4kHz and 192kHz.
- It has 2 independent sample rate converter circuits that use a common clock source to set the output sample rate.
- It has 2 optional video synchronising boards. These set the output sample rate to 48kHz which is synchronised to either an analogue video signal or SDI digital video signal (HD or SD).
- A special X-Lock mode allows the unit to function as a full bi-directional sample rate converter.
- It has TOSlink optical digital audio inputs and outputs.
- It has front panel push-button switches for all the main settings. The buttons are arranged in sets, where pressing the button advances the current selection and LED indicator.
- A serial RS232 port is included so that the RB-SC2 settings can be controlled remotely. The front panel LED indicators to alter automatically when using RS232 commands.
|Distortion and Noise:||-114dB THD + N at 1kHz, ref 0dB FS|
|Input Impedance:||75Ω S/PDIF inputs 110Ω AES/EBU input 50Ω BNC TTL word clock input|
|Sample Frequency Range:||Master rates of 32kHz, 44.1kHz, 48kHz or 96kHz, or can synchronise to incoming 32kHz to 100kHz sample rate|
|Bit Depth:||Up to and including 24 bit|
Rear Panel Connections and Controls
|Inputs:||2 x AES/EBU XLR 3 pin female (audio and sync) 2 x S/PDIF RCA phono (audio and sync) 1 x TTL BNC female (sync)|
|Outputs:||1 x AES/EBU XLR 3 pin male 1 x S/PDIF RCA phono|
|Input Select:||Push-button switch between AES/EBU and S/PDIF|
|Output Select:||Push-button switch between AES/EBU and S/PDIF|
|Sync Select:||Push-button switch between AES/EBU and S/PDIF, with DIP switch selection between TTL and the other two inputs.|
|Operational Modes:||Master mode, auto-sync mode, auto-lock mode and slave mode, set via rotary switch|
|Status Bits:||Forced to consumer mode, professional mode, or set to follow input with DIP switch selection.|
|Mains Input:||Filtered IEC, continuously rated 85-264VAC @ 47-63Hz, max 10W|
|Fuse Rating:||Anti-surge fuse 1A 20 x 5mm|
|RB-SC1:||Sample rate converter|
|Dimensions (Raw):||28cm (W) x 10.8cm (D) x 4.2cm (H) (1U) 11” (W) x 4.3” (D) x 1.7” (H) (1U)|
|Dimensions (Boxed):||36cm (W) x 20.5cm (D) x 6cm (H) (Boxed): 14.2” (W) x 8” (D) x 2.4” (H)|
|Weight:||Nett: 1.0kg Gross: 1.4kg Nett: 2.2lbs Gross: 3.1lbs|
|Dynamic Range:||138dB typical A-Weighted.|
|Distortion & Noise:||-134dB THD + N at 1kHz, ref 0 dBFS|
|Sample Freq Range:||32kHz – 196kHz|
|Input Sample Width:||Up to and including 24 Bits.|
|Output Sample Width:||24 Bits.|
|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)|
|Video Sync Specs:||The Digital video sync board will accept 270Mbps SD-SDI and HD-SDI signals covered by SMPTE-259-M-C (SD) and SMPTE-292M (HD).The Analogue video sync board will accept a composite signal of NTSC (525), PAL (625) & SECAM (625) signals covered by SMPTE-170-M (NTSC) and ITU-R BT.470-6 (PAL & SECAM).|
|Master Frequency Select:||32, 44.1, 48, 88.2, 96,176.4 or 192kHz via FREQUENCY push-button|
|Channel Status Bits:||Consumer mode, professional mode or follow input, via CS DATA push-button|
|Digital Select:||AES/EBU, S/PDIF or TOSlink input optical, via INPUT1 or INPUT2 push-buttons|
|Sync Input Select:||AES/EBU, Word Clock, X-Lock or Video, via SYNC push-button|
|Sync Mode elect:||Master, slave, auto or auto-lock, via SYNC push-button|
|Mains Input:||Universal filtered IEC, continuously rated 85-264VAC @47- 63Hz, max 10W|
|Fuse Rating:||Anti-surge fuse 1A 20 x 5mm|
|Serial Port:||RS232 9 Pin D-type socket|
|RB-SC2:||Dual Stereo Sample Rate Converter, 24 bit 192kHz|
|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|
|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 Red boxes|
|* Note that this product is deeper than standard Red boxes|
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