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    • 7. 发明专利
    • ACOUSTIC SIGNAL INPUT METHOD
    • JPH0419525A
    • 1992-01-23
    • JP12353090
    • 1990-05-14
    • TAKENAKA KOMUTEN CO
    • HIDAKA TAKAYUKIMASUDA SADAYASU
    • G01H17/00
    • PURPOSE:To generate an accurate trigger signal and to securely input an acoustic signal by branching the acoustic signal between a reception part and a signal input part, and delaying one and inputting the other as a trigger signal to the signal input part. CONSTITUTION:The acoustic signal is outputted by a speaker 12 and inputted to a microphone 20. The acoustic signal which is inputted 20 is delayed by a specific time through a delay circuit 26 and then outputted to an A/D converter 22. Further, the acoustic signal which is inputted to the microphone 20 is inputted to the trigger input terminal 30 of the A/D converter 22 through a branch line 28. Consequently, the acoustic signal which is inputted from the delay circuit 26 to the A/D converter 22 is A/D-converted successively according to the trigger signal inputted to the trigger input terminal 30 and stored in a memory 24. Thus, the acoustic signal inputted to the microphone 20 is branched to obtain the trigger signal, so there is no lower-limit value of a trigger level which is generated when synchronous addition processing is performed by self-triggering. Consequently, the acoustic signal which is outputted from the speaker 12 can be added faithfully and synchronously.