Patent ID: 8273977

Claim:
An audio system for producing a music tune, comprising: a communication channel for propagating a digital audio signal and a device control signal identical in format with said digital audio signal therethrough; a signal producing apparatus including a storage unit storing at least one audio data file having data blocks assigned to pieces of audio data expressing discrete values on the waveform of an analog audio signal and other data blocks assigned to pieces of other sorts of data and at least one command file having data blocks corresponding to said data blocks of said at least one audio data file and other data blocks corresponding to said other data blocks of said at least one audio data file and assigned to at least one piece of command data expressing a command, a signal producing unit connected to said storage unit and producing said digital audio signal and said device control signal from said pieces of audio data and said pieces of other sort of data in said at least one audio data file and from said at least one piece of command data in said at least one command file, and a communication unit connected to said signal producing unit and said communication channel and delivering said digital audio signal and said device control signal to said communication channel; and a sound producing apparatus including a communication unit connected to said communication channel and receiving said audio signal and said device control signal, a signal-to-sound converter connected to said communication unit and responsive to said command so as to convert said digital audio signal to said sound, and a command restorer connected to said communication unit and said signal-to-sound converter and restoring said device control signal to said at least one piece of command data so as to control said signal-to-sound converter with said command.