WRONG SWITCH OPERATION PREVENTIVE DEVICE AND AUDIO SIGNAL PROCESSING DEVICE EQUIPPED WITH WRONG SWITCH OPERATION PREVENTIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent a wrong operation of a switch. ;SOLUTION: A PA(public address) system is equipped with a DSP(digital signal processing device) 10 which processes audio signals from various sound sources for broadcast and emits the resultant signal, wherein the steps of processing A, B, C... to be executed by the DSP 10 are previously stored in a memory part 12. Those of the stored steps A, B, C... which are to be executed actually by the DSP 10 are selected by switches 201, 202, 203.... Even if these switches are depressed, it will not be acknowledged directly, but a certain predetermined duration of depression allows first acknowledgement that the applicable switch was depressed by intention. Therefore, wrong operation of each switch, for example touching undeliberately, does not put the system in operation. Thus misoperation is precluded.;COPYRIGHT: (C)1999,JPO