The present invention provides an injection seeded modular gas discharge laser system capable of producing high quality pulsed laser beams at pulse rates of about 4,000 Hz or greater and at pulse energies of about 5 to 10 mJ or greater for integrated outputs of about 20 to 40 Watts or greater. In one embodiment, a number of samples for an anti-aliasing operation is determined. This signal is outside the IF signal data range. Audio received from the selected audio source may be substituted for audio associated with the visualvideo content. The communication interface is configured to allow for the communication between the system unit and the medical diagnostic system of identification information and operational data regarding the system unit.