Digital quasi-rms detector

Details Digital quasi-rms detector Digital quasi-rms detector

H - Electricity

04

R

H04R 25/00 (2006.01) G01R 19/02 (2006.01) G10L 19/06 (2006.01) G01R 29/04 (2006.01)

Patent

CA 2382358

A digital quasi-RMS detector is provided that approximates the time-varying RMS energy of a signal. The digital quasi-RMS detector rectifies the signal and compares the rectified signal with an estimated present energy value of the audio signal. If the difference between the rectified signal and the estimated present energy value is not greater than zero, then the digital quasi-RMS detector multiplies the rectified signal by a first time constant to generate a first filtered signal and sums the first filter signal with the estimated present energy value to determine the approximate RMS energy. If the difference between the rectified signal and the estimated present energy is greater than zero, however, then the digital quasi-RMS detector multiplies the rectified signal by a second time constant to generate a second filtered signal and sums the second filtered signal with the estimated present energy value to determine the approximate RMS energy.

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