Digital quasi-RMS detector

Details Digital quasi-RMS detector Digital quasi-RMS detector

2006-07-11

2006-07-11

Tran, Sinh (Department: 2646)

Electrical audio signal processing systems and devices

Hearing aids, electrical

Wideband gain control

C381S312000, C381S313000, C381S317000

Reexamination Certificate

active

07076073

ABSTRACT:
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 filtered 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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