| 摘要 |
PURPOSE: To make it possible to surely grasp a working state and execute proper operation even if working positions are not seen. CONSTITUTION: ROM221 as a virtual sound memory device is divided into a plurality of blocks, and virtual sound signals with different tones are stored in each of the blocks. Operating state signals such as load signals, etc., acting on, for example, a bucket are transmitted from an operation machine side. Tone selecting signals are generated from the received operating state signals at a reception side. A latch circuit 22 samples the generated tone selecting signals in a previously settled sampling period, and the corresponding block is selected. While, a signal generator 226 outputs signals in a specific period, and addresses from the peak address among the selected blocks to the last address are selected. By the constitution, the virtual sound signals are selectively read out from the virtual sound memory device, and virtual sounds as audible signals are outputted from a speaker device. |
