JPS5523687A - Audio equipment for vehicle use - Google Patents

Abstract

PURPOSE:To install the selection means at a location easily operationable by the rider, by forming echo characteristics close to the listening room normally in the car room and separating the audio reproduction unit and the unit selection means through the use of audio image control technology including the delay circuit. CONSTITUTION:The input signal of left and right channel signals L and R of the audio reproducing unit 1A is mixed with the mixing circuit 28 to output the output signal 03, and this signal O3 is delayed at the delay circuit 29 to output the output signal O4. Further, the signal O4 is inverted for the phase at the delay circuit 30 and the output signals O5 and O6 are picked up. The signals O5, O6 are respectively fed to the mixing circuits 31, 32 taking the signal of L and R as input, and the output signal O7, O8 are fed to the amplifiers 33 and 34. The output of the unit 1 is selected with the switch 38 determining three selected positions provided at the tuner 3A and fed to the L and R control circuits 39 and 40, to form excellent echo characteristics by controlling the respective signal.