| 摘要 |
PURPOSE:To allow two listeners to select independently program sources with one audio reproducing device by providing 1st and 2nd audio signal lines to plural program sources and providing a switch circuit selecting independently a program source and a sound volume adjustment variable resistor to the reproducing equipment. CONSTITUTION:When a key of a transmitter 91 is operated, switch circuits 12, 13, 31, 32, 42 of 1st signal lines 10, 40 and variable resistors 14, 34 are controlled by a control signal corresponding to the operated key. Thus, a listener LSN 1 in a 1st room 1 uses a transmitter 91 to select freely sources from terminals 111-11n, 18, 411-41n and to adjust the sound volume at that time freely. Moreover, when a key of a transmitter 92 is operated, a listener LSN 2 in a 2nd room 2 uses a transmitter 92 to select freely sources and to control switch circuits 22, 23, 31, 32, 52 and variable resistor 24 of end signal lines 20, 50 thereby adjusting the sound volume freely. |
