Patent ID: 7876909

Claim:
A circuit for producing artificial ambience, said circuit comprising: a transient reduction module adapted to reduce transients in an input audio signal comprised of one or more channels, said transient reduction module comprises: an absolute value module adapted to calculate an absolute value signal of a mathematical representation associated with the input audio signal; an envelope detector module adapted to receive the absolute value signal from said absolute value module and to apply a smoothing filter to it, giving rise to an envelope signal; a maximum value module adapted to receive the absolute value signal from said absolute value module and the envelope signal from said envelope detector module and to determine the maximum of the two signals at each selected time instance: a divider module adapted to receive the envelope signal from said envelope detector module and the maximum value signal from said maximum value module and to calculate a ratio between the envelope signal and the maximum value signal at each selected time instance; and a smoothing module adapted to receive the ratio signal from said divider module and to apply a smoothing filter, giving rise to a smoothed ratio signal, and wherein the smoothed ratio signal is adapted to control a gain applied to the input signal to generate an output signal; and a reverberation filter adapted to receive the transient-reduced signal comprised of one or more channels and to produce a reverbed signal comprised of one or more channels corresponding to the transient-reduced signal.