This card interfaces with an impedence controlled backplane that carries 128 time-division multiplexed audio channels. It provides a DRAM shared between a SCSI interface, a signal processor and the ISA bus of the host PC. It also contains a host microprocessor used to initialise the card and provide diagnostic functions.

This card contains five digital signal processor (DSP) devices (shown simplified). Four Motorola DSP56000 devices provided audio processing while the fifth provides an interface to the backplane. The card contains complex logic (using Xilinx FPGA and PAL logic devices) for distributing data and commands (vectors) between the DSPs.

This card contains five Xilinx FPGA devices (shown simplified); four of these provide an interface with serial digital audio streams whilst the fifth provides an interface to the backplane. The dualport RAMs are used to provide a small audio sample buffer able to accomodate small drifts in syncronisation with other equipment.

This card contains four high-quality sigma-delta stereo analogue to digital converters and balanced line receivers.

This card contains four high-quality sigma-delta stereo digital to analogue converters and balanced line drivers.

This allows the sound-station to synchronise its sampling to other equipment as well as to video time-code signals. The dual phase-locked loop design gives a wide pull-in range along with a very low jitter output.

The sound-station includes a mixing desk with eight motorised faders able to follow previous level adjustments as the audio track played. A simplified circuit for this desk is shown below. The drive automatically cuts off the moment the fader is touched. The DSP device provides a PID control-loop and PWM drive signals for the motors.