1. A method for suppressing noise in a source speech signal, said method comprising: calculating a signal-to-noise ratio in said source speech signal; calculating a background noise estimate for a current frame of said source speech signal based on said current frame and at least one previous frame and in accordance with said signal-to-noise ratio, wherein said calculating said signal-to-noise ratio is carried out independent from said background noise estimate for said current frame; calculating an over-subtraction parameter based on said signal-to-noise ratio; calculating a noise-floor parameter based on said signal-to-noise ratio; and subtracting said background noise estimate from said source speech signal based on said over-subtraction parameter and said noise-floor parameter to produce a noise-reduced speech signal.