| 摘要 |
PURPOSE:To realize alarm sounds comfortable to the ear by using plural alarm sounding frequencies and further providing a function of giving envelope to sound volume. CONSTITUTION:When an alarm coincidence signal assumes ''1'', the signal from an oscillation circuit 1 is inputted to an EXNOR gate G2 via an AND gate G1, and at the same time, the reset of flip-flops (IF) 3-6, 14-18 is released. Latch circuits 7-18 receive the outputs of these FFs and generate outputs. The outputs of the FFs and the outputs of the latch circuits are inputted to a signal synthesis circuit and AND gate, and are logically processed, whereby speaker driving outputs are obtained. |
