ELECTRICAL SIMULATION OF PERCUSSIVE BELL

摘要

ELECTRICAL SIMULATION OF PERCUSSIVE BELL An electronic circuit for simulating the sound of a percussive bell struck at a predetermined repetition rate. A realistic electronically generated sound is produced by appropriately modulating two or more audio frequencies with a decaying exponential control signal and thereafter mixing the modulated frequencies. The system comprises a repetition rate generator; a modulation envelope generator; a high and low frequency oscillator; a modulator; and a mixer together with a loud speaker. The repetition rate generator determines the ringing frequency of the simulated bell sound. The modulation envelope generator generates two decaying control signal with differing time constants with the time constant of the low frequency generator usually being greater thanthe time constant of the high frequency generator. Filter networks may be used to eliminate some of the harmonics. Potentiometers may be provided to vary the magnitude of the low and high frequency components at the input to the mixer. An isolation transformer may be used and connected to an external amplifier for audio distribution of the electronically generated sound.