A decision feedback equalizer includes a forward equalizer, first and second adders, a decision device, a feedback equalizer, and an N-tap filter. A sparsifying image is reconstructed from a series of acquired undersampled data to provide a priori knowledge of a subject being imaged. The one or more hardware processors generate first and second presentation displays of the mock trial, each having an arrangement of content that may include a live-action video, a pre-recorded video, an image, interactive actuators or icons, text, or combinations thereof. Moreover, during connection of the communication path, the character data in the composite data relevant to the contents of the talk, for example, can be displayed on a display.