Abstract: A modular digital presentation switcher is a device that can convert different kinds of incoming multimedia signals into an outgoing signal in an analog and digital format. The device retrieves the incoming multimedia signals through input modules. Each of the input modules is capable of retrieving a unique signal such as composite video or S-video, VGA, and DVI-D. The device sends the outgoing signal through output modules, which are connected to the display device and the audio amplifier. A communication bus allows the input modules and the output modules to communicate with each other so that the device can cater and format the outgoing signal for the display device and the audio amplifier. An HDMI digital signal bus allows the input modules to send the outgoing signal in HDMI digital format to the output modules. A user interface module allows the user to access the functions of the device.