| 摘要 |
An electrical signal representing speech is filtered by attenuating low frequency components of the signal. The RMS amplitude of the signal after filtering is compared with the RMS amplitude of the signal before filtering and the ratio is used to control the gain of an amplifier coupled to the filtered signal. The harmonic content of the electrical signal is increased, before or after filtering, by raising the signal to a power, filtering, raising the signal to the inverse power, and filtering. The power is preferably greater than one and less than two. The final output signal is approximately as loud as the original signal.
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