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Trigger circuit unit for operating light emitting members such as leds or motors for use in personal ornament or toy in synchronization with music

  • US 5,402,702 A
  • Filed: 07/14/1992
  • Issued: 04/04/1995
  • Est. Priority Date: 07/14/1992
  • Status: Expired due to Fees
First Claim
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1. A trigger circuit for operating mechanisms in synchronization with music, said trigger circuit comprising:

  • a forward circuit block comprising,a microphone for picking up audible musical signals originating from a source remote from said trigger circuit and for converting said picked up signals into electrical signals,a filter circuit for selecting a predetermined frequency band from said electrical signals, anda limit amplifier circuit comprising an inverter operation logic integrated circuit for amplifying said selected electrical signals and for transmitting an output having a predetermined amplitude; and

    a waveform conversion circuit block comprising,a time constant circuit connected to the output of said forward circuit block comprising a capacitor connected in series with at least one diode and a resistor in order to prevent backflow and to obtain a forward directional voltage difference,said time constant circuit being arranged to convert said amplified electrical signals into analog pulse signals with amplitudes greater than a predetermined level, the level obtained from said forward directional voltage difference,said time constant circuit further comprising a Schmidt circuit having a predetermined degree of hysteresis for converting said analog pulse signals into rectangular pulse signals before they are transmitted,whereby said rectangular pulse signals transmitted from said waveform conversion circuit block are basic trigger signals that correspond to said audible musical signals for operating said mechanisms.

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