Calrec Sigma Digital Production Console

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Used Calrec Sigma Audio Board

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Sigma is Calrec’s second all digital production console designed for the most critical broadcast production and on-air applications. Based on the well established Alpha digital system architecture, Sigma provides comprehensive features and functionality with sophisticated failure protection systems. Sigma continues to meet the changing requirements demanded by the on-set of surround sources in live production, providing sophisticated assignable monitoring solutions and encompassing flexible TFT style metering.
Paths and Ports
On an analog desk, the channel inputs are physical connections to the channel module or card. They are fixed. Channel 1’s input is always channel 1’s input (even though it may be possible to control channel 1 from a different fader). Every channel will probably have both a mic and a line input, even though most will only use one of them at any one time. In a digital desk, there are two basic types of input: mic/line and digital. However, it is not necessary to provide both types for every channel, as only one input will be used at any one time. To provide both types for each channel would increase the cost, size and power consumption of the desk unnecessarily. Instead, a “pool” of each type is available, plus an internal matrix to allow any of them to be connected to any channel. This provides more flexibility than is possible with analog designs. The matrix can be thought of as an electronic patch-bay with the advantage that any connections made will be stored with the console’s memories. A similar matrix and “pool” is provided for the outputs which is also stored with the memories.
Each channel can select from two inputs (1 and 2), which can be any combination of mic/line and digitaI. Both inputs can be set up independently, using separate input controls ( input gain, phase reverse, phantom power, etc). The switching between the two inputs takes place after these controls. The basic terminology is that channels, groups and mains are referred to as “paths” within the digital processing system, and the inputs and outputs are referred to as “ports” through which the audio signals 12 SIGMA with Bluefin have to pass. Ports are connected to paths via the Matrix. All ports are optional, including those for the monitoring. The system can be supplied with any combination of mic/line and digital ports. Calrec digital consoles are available in a number of configurations known as Audio Packs, which are a suggested complement of ports. The Audio Pack which most closely matches the requirements of the installation can be chosen, and the port quantities can be fine tuned appropriately