CPC G10L 19/022 (2013.01) [G10L 19/0212 (2013.01); G10L 19/24 (2013.01); G10L 21/038 (2013.01); G10L 21/04 (2013.01)] | 12 Claims |
1. An audio signal processing device for transposing an input audio signal by a transposition factor T to generate an output audio signal, the audio signal processing device comprising one or more components that:
extract a frame of L time-domain samples of the input audio signal using an analysis window of length L having the function
convert the L time-domain samples into M complex frequency-domain coefficients;
alter a phase of the complex frequency-domain coefficients using the transposition factor T;
convert the altered frequency-domain coefficients into M altered time-domain samples; and
create a frame of L time-domain output samples of the output audio signal from the M altered time-domain samples using a synthesis window;
wherein M=F*L, with F being a frequency domain oversampling factor determined in response to frequency domain oversampling information received in an encoded bitstream; and
wherein the frame of L time-domain output samples of the output audio signal comprises a plurality of high frequency components not present in the frame of L time-domain samples of the input audio signal, at least one of the high frequency components is generated using the transposition factor T, and at least one other of the high frequency components is generated using a second transposition factor T2, wherein T is not equal to T2.
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