H - Electricity – 04 – R
Patent
H - Electricity
04
R
179/42
H04R 3/00 (2006.01) G10L 11/02 (2006.01)
Patent
CA 1184506
ABSTRACT The human voice is discriminated from other sounds in an audio signal by first recognizing that the human voice includes a fundamental frequency saw-tooth wave in the low bass region. Sounds in this region are also important for effects where body felt vibrations are to be transmitted direct to a listener or appreciator of the sound. The gain of an amplifier for using such sound effects is controlled in accordance with frequencies in the audio spectrum below that containing appreciable human voice frequency components. Apparatus detects the level of the total audio signal and subtracts the output of a human voice detector circuit, to provide the control for the amplifier. Human voice detector circuits exploit the fact that the human voice signal can be regarded as an amplitude modulated carrier wave. Sound effect frequencies in the range below that containing substantial frequency components of the human voice may be added to the detected total signal level from which the output of the human voice detector is subtracted before application to the amplifier.
375651
Bodysonic Kabushiki Kaisha
Borden Ladner Gervais Llp
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