Sonifex RB-DD4 4-Channel Digital Audio Delay Synchroniser

Sonifex RB-DD4 4-Channel Digital Audio Delay Synchroniser

You can individually or collectively delay four mono channels of audio using the RB-DD4 four-channel digital audio delay. Users can choose from a range of standard video frame rates for each channel delay, or they can create their custom delay via the serial interface. The device is ideal for restoring audio and video synchronization that has been disrupted by processing delays.

You can choose the channel that needs to be delayed by pressing a button on the front panel. Additionally, there is an "ALL" option that enables the delay to be applied to every channel. Then, you may choose how many frames to delay and how long to delay one frame by pressing another button on the front panel.
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The flexibility continues with many audio synchronization options. The digital audio output can be synchronized to either input, an additional AES/EBU reference input, a TTL word clock BNC input, or an analog/SDI video feed if used with an additional RB-SYA or RB-SYD board. Also, the output can be synchronized to an on-board master clock, with a selectable frame rate. There are warning indicators on the front panel for loss of lock on both inputs and for the selected external synchronization. Selectable synchronization modes are as follows:

Master Mode

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 selected sync input. When the sync signal is not present the output sample rate will be set by, and locked to, the internal on-board clock generator at the selected output frequency.

Auto Lock Mode

In this mode, no output will be generated until the 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.

Slave Mode

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.

A powerful feature of the RB-DD4 is that by using the Sonifex SCi serial software, the unit can be programmed for different delay durations, levels, and switching functions so that you can program the unit for your specific application. A rear panel DIPswitch configures the unit to be controlled serially. Contact Sonifex for further information if you have a particular requirement that isn’t catered for by the RB-DD4 as standard.

The RB-DD4 has been designed to have a passive signal path through the main input, so if power to the unit fails, signal inputs 1 & 2 are routed to outputs 1 & 2, and signal inputs 3 & 4 are routed to outputs 3 & 4. This is essential for applications such as installation at transmitter sites, where a power failure to the unit should not prevent the audio input signal from being output to the transmitter. Please note that this is not true for the TOSLink outputs which are muted.