| 摘要 |
PURPOSE:To reproduce signals from different sound sources simultaneously through a speaker and a headphone by providing a changeover switch to a multi-sound source type audio system to be mounted on vihicle. CONSTITUTION:Input/output terminals i1, i2, o1, o2 of an analog switch SW conduct any one of audio signals AM, FM and TAPE to an amplifier AF1 and the input/output terminals i3, i4, o3, o4 conduct any one of them to an amplifier AF2. A latch RT selects one of switches SW (on the amplifier AF side). Key codes DA-DD for the latch are entered at timing L1, L2. The table shows the relation between the key codes and functions. When the code DA-DD are switched to speaker and headphone code by the prestage controller and a signal is inputted to latches RT1, RT2 at the different timing L1, L2, different signals can be reproduced by the speaker and headphone. |
