ELECTRICAL SIGNAL PROCESSING METHOD AND APPARATUS

摘要

PURPOSE: To recognize a signal characteristic which indicates a change in an electric signal generating process by measuring the minimum value of an electric signal and the mean value of the signal and determining a ratio of the mean value to the minimum value. CONSTITUTION: An electric signal generated by a transducer 12 is supplied to an amplifier 14, and the amplified electric signal is supplied to a signal enveloper 16 for fetching an envelope of the electric signal. The envelope type electric signal is supplied to a mean level detector 18 and a minimum level detector 20, and the mean level detector 18 measures the mean level of the electric signal by integrating electric signals during measuring time, and the detector 20 measures the minimum level of the electric signal. These detected mean level and minimum level of electric signal are supplied to a ratio measuring instrument 22 and the measuring instrument 22 determines a ratio of the mean level of electric signal to the minimum level, and the output is supplied to an output terminal 24. The terminal 24 controls the operation of a machine or a process by a feedback signal.