The first aspect of the invention relates to a method for generating an output
audio signal intended to accompany a slowed-down video
signal, comprising the following steps: a) capturing an input
audio signal; b) splitting the input
audio signal into a plurality of segments; c) recording the plurality of segments of the input audio
signal; d) assigning a time code to each segment of the input audio
signal; e) recording the time code of a segment in
metadata linked to the segment of the audio signal; f) generating an output audio signal of a predetermined duration corresponding to a speed slowed down by a predetermined factor for each of the segments of the audio signal, as follows: - dividing the segment of the input audio signal into a set of grains (G0, G1, G2,...) each having a length (L0, L1, L2,...) and a temporal position (P0, P1, P2,...), - inserting the grains (G0, G1, G2,...) into the segment of the output audio signal at a temporal position (P'0, P'1, P'2,...) that corresponds to the original temporal position of the grains (G0, G1, G2,...) corrected by a factor dependent on the speed of the slowed-down sequence, - generating filler grains (G'0, G'1,...) intended to fill the spaces between the grains (G0, G1, G2,...) of the segment of the output audio signal and - inserting the filler grains (G'0, G'1,...) into the spaces between the grains (G0, G1, G2,...) of the segment of the output audio signal, - the filler grains (G'0, G'1,...) being generated by interpolation; g) recording the output audio signals corresponding to each segment while keeping the time code in the
metadata. Other aspects of the invention relate to a method for
broadcasting a slowed-down audio-video signal based on the use of the output audio signal thus generated, and to the output audio signal as such.