Patent ID: 7173544

Claim:
An on-vehicle DSRC apparatus for use in a dedicated short-range communication system of intelligent transport systems, and which is mounted on a vehicle traveling on a road, the DSRC on-vehicle apparatus comprising: a radio communication section carrying out a communication with information radio equipment provided on a roadside; a sound volume setting section setting a sound volume of a speaker that announces information with a voice; a first switch of a press button type that is located on a panel front face and has said sound volume setting function; and a switch determination section that detects a connection/disconnection of said first switch with an elapse of time and recognizes said connection/disconnection as a pattern in the course of the time, compares said pattern with a plurality of patterns having been preliminarily stored, and allots a function having been assigned to said pattern with which a current pattern is coincident to said first switch on condition that the current pattern is coincident with any of said plurality of patterns having been preliminarily stored.