Abstract: Disclosed is a method for reducing residual echo including: performing an echo cancellation process on a voice input signal according to an echo reference signal to obtain an echo cancellation signal; performing a FFT on the echo reference signal to obtain a reference spectrum signal for each frame; performing the FFT on the echo cancellation signal to obtain a speech spectrum signal for each frame; using the reference spectrum signal and the speech spectrum signal of a current frame to obtain a priori signal-to-noise ratio of the current frame according to a principle of additive noise; filtering the speech spectrum signal of the current frame by a Wiener filter coefficient of the current frame determined by the prior signal-to-noise ratio of the current frame to obtain a target spectrum signal of each frame; performing an IFFT on the target spectrum signal of each frame to obtain a target voice signal.

Abstract: A method for motion vector de-interlacing decodes macro blocks in a picture, calculates motion vectors of the each MB, produces de-interlacing flag according to the threshold, realizes a Temporal Extension action and performs a Devour action. The Temporal Extension action checks multiple flag buffers, determines if a de-interlace flag should be set as WEAVE or BOB2 based on whether there exists a predetermined number of BOB flags in those flag buffers The Devour action determines if the de-interlace flag is BOB. If positive, it calculates the amount of BOB data within a predetermined area around the current MB, determines if the result is smaller than the BOB threshold and sets the de-interlace flag as WEAVE. Otherwise, it calculates the amount of the WEAVE data, determines if the result is smaller than the WEAVE threshold and sets the de-interlace flag as BOB2.

Abstract: A method for line average de-interlacing decodes a picture to form macro blocks (MBs), calculates line average values to form a threshold, produces de-interlacing flags by comparing the line average values and the threshold, realizes Temporal Extension action and performs Devour action. The Temporal Extension action determines if the current de-interlace flag is set as WEAVE, determines if the flags in the same position in other flag buffers are set as BOB and sets the de-interlace flags as BOB2. The Devour action determines if the de-interlace flag is BOB. If positive, it calculates the amount of BOB data within a predetermined area around the current MB, determines if the result is smaller than the BOB threshold and sets the de-interlace flag as WEAVE. Otherwise, it calculates the amount of the WEAVE data, determines if the result is smaller than the WEAVE threshold and sets the de-interlace flag as BOB2.

Abstract: A method for motion vector de-interlacing decodes macro blocks in a picture, calculates motion vectors of the each MB, produces de-interlacing flag according to the threshold, realizes a Temporal Extension action and performs a Devour action. The Temporal Extension action checks multiple flag buffers, determines if a de-interlace flag should be set as WEAVE or BOB2 based on whether there exists a predetermined number of BOB flags in those flag buffers The Devour action determines if the de-interlace flag is BOB. If positive, it calculates the amount of BOB data within a predetermined area around the current MB, determines if the result is smaller than the BOB threshold and sets the de-interlace flag as WEAVE. Otherwise, it calculates the amount of the WEAVE data, determines if the result is smaller than the WEAVE threshold and sets the de-interlace flag as BOB2.

Abstract: A method for line average de-interlacing decodes a picture to form macro blocks (MBs), calculates line average values to form a threshold, produces de-interlacing flags by comparing the line average values and the threshold, realizes Temporal Extension action and performs Devour action. The Temporal Extension action determines if the current de-interlace flag is set as WEAVE, determines if the flags in the same position in other flag buffers are set as BOB and sets the de-interlace flags as BOB2. The Devour action determines if the de-interlace flag is BOB. If positive, it calculates the amount of BOB data within a predetermined area around the current MB, determines if the result is smaller than the BOB threshold and sets the de-interlace flag as WEAVE. Otherwise, it calculates the amount of the WEAVE data, determines if the result is smaller than the WEAVE threshold and sets the de-interlace flag as BOB2.