Patent ID: 6700050
Filing Date: 2004-03-02
Classification: G10H

Abstract:
A bus system interconnecting a plurality of devices of various categories constituting an electronic music instrument apparatus for exchanging signals among the devices having unique addresses, the bus system comprising a serial clock line connecting to the devices for transmission of a clock signal, and a serial data line connecting to the devices for transfer of a data signal from a source device to a destination device in synchronization with the clock signal, whereinthe source device operates as a master to commence a communicating session such as to send the clock signal to the serial clock line and to send the data signal to the serial data line in synchronization with the clock signal, and the destination device operates as a slave during the communicating session such as to receive the data signal through the serial data line based on the clock signal fed from the serial clock line, wherein the source device formulates the data signal containing a unique address specifying the destination device such that the destination device can receive the data signal exclusively from the source device, the unique address comprising category information designating a category to which the destination device belongs and a sub-address specifying the destination device in the designated category, wherein the devices have outputs of the clock signals connected to the serial clock line through wired AND connectors and outputs of the data signals connected to the serial data line through wired AND connections, and wherein the devices have respective orders of priority determined according to the respective categories of the devices, and in case that two or more of source devices try to commence respective communicating sessions to respective destination devices, the source device having the communicating session to the destination device of the category having the highest order of the priority precedes as the master of the communicating session according to the unique addresses of the respective destination devices contained in the data signals directed thereto.