Improving transient performance of low bit rate audio coding systems by reducing pre-noise

The invention claims an instant signal through detection signal converter and transmitting the signal instant to reduce to the time domain relation of code with an audio signal of the distorted component of instant signal, an audio signal of which passes through a using code block transformation low bit rate audio encoding processing system, the change instant signal time domain position capable of energy the distorted component the duration. The is a front based on low bit rate audio coder of converting and a quantization processing the instant signal to locate to a time data zooming process, and movable reducing of the decoded signal of a noise total amount. And the replacing failed, or the extra processing technology, wherein the conversion low bit rate audio encoding system, instant signal of the detection signal, and distorting component part for a time, so reducing groove component duration.