Large Mix-Minus Matrix Systems
The versatile ADD series digital audio mixers may be configured for use in large studios for sports and outside broadcast applications.
The system uses a Digital Signal Processing system configured and controled by a specialised software script to allow users to "mix and minus" any of the 40 analogue or digital inputs to 24 analogue or digital outputs.
Changes to any of the mix outputs may be made in real time and are silent in their operation. A X - Y type panel allows the operator to interogate the system either by displaying which inputs are connected to an output or which outputs are being fed from an input.
The ADD mixers will also provide level controls which can be assigned to inputs, mix outputs or any intermediate stages as required.
As the mixing is done in the digital domain it is possible to perform real mix-minus functions. Audio performance is excellent with a frequency response of 20-20kHz and a dynamic range of better than 105dB, and a background noise floor in the analogue domain of better than -85dBu.
Audio delays through the system are very low - typically 5 sample periods in the digital processing system. Delays through the converter systems will depend on the converters used but typically will be less than 1mS.
ITN News use Audix Broadcast dual domain Transmission Matrix
As part of a new Digital Radio Service launched in June 2000 ITN have purchased a specialised dual domain transmission matrix.
The system allows ON-AIR selection from the two studios on a traditional OFFER-TAKE basis as well as each studio being able to select a sustaining service during an "out of hours" schedule.
The audio routing matrix provides two separate audio paths and a digital AES/EBU synchronises all inputs within the matrix to perform silent switching on the outputs.
Originally designed as a standby router, a second matrix system was incorporated to provide routing for stereo analogue circuits and is slaved to the digital audio routing.
As an option the system incorporates a RS422 serial comms. channel allowing the unit to be controlled remotely though a customer's IT network.
The system provides a simple compact dual domain 6 input 2 stereo output transmission routing matrix which can be operated from a simple DC logic interface or through a PC serial port.
