Digital signal processing apparatus

A digital signal processing apparatus for processing a plurality of video signals and a plurality of audio signals, comprising:

• a computer comprising a system bus and a main CPU connected to said system bus;
• an extension processor comprising a plurality of signal processing circuits mounted thereon, each for processing one or more of said plurality of video signals and said plurality of audio signals, and a local CPU for controlling said plurality of signal processing circuits so as to allow for the processing of said video signals and audio signals in real time, said extension processor being selectively coupleable to said system bus;
• wherein said extension processor further comprises an extension system bus extended from said system bus and selectively coupleable therewith, a digital audio video (DAV) bus for transmitting said plurality of video signals and said plurality of audio signals between said plurality of signal processing circuits and a local CPU bus for transmitting control signals outputted from said local CPU;
• and
• wherein each signal processing circuit has a common interface means connectable to said extension system bus, said DAV bus and said local CPU bus of said signal processing circuits in any mounting position of said extension processor, thereby allowing for the processing of said video signals and audio signals regardless of the mounting positions of said signal processing circuits on said extension processor.