US 11,676,622 B2
Method, apparatus and systems for audio decoding and encoding
Heiko Purnhagen, Sundbyberg (SE); Kristofer Kjoerling, Solna (SE); Alexander Stahlmann, Bubenreuth (DE); Jens Popp, Nuremberg (DE); and Karl Jonas Roeden, Solna (SE)
Assigned to DOLBY INTERNATIONAL AB, Dublin (IE)
Filed by DOLBY INTERNATIONAL AB, Amsterdam Zuidoost (NL)
Filed on Jun. 10, 2021, as Appl. No. 17/343,761.
Application 17/343,761 is a division of application No. 15/903,591, filed on Feb. 23, 2018, granted, now 11,037,582.
Application 15/903,591 is a division of application No. 14/779,170, granted, now 9,911,434, issued on Mar. 6, 2018, previously published as PCT/EP2014/056848, filed on Apr. 4, 2014.
Claims priority of provisional application 61/808,701, filed on Apr. 5, 2013.
Prior Publication US 2021/0375304 A1, Dec. 2, 2021
Int. Cl. G10L 21/00 (2013.01); G10L 21/055 (2013.01); G10L 19/022 (2013.01); H04N 21/2368 (2011.01); H04N 21/439 (2011.01); G10L 19/16 (2013.01); H04N 21/43 (2011.01); G10L 19/22 (2013.01)
CPC G10L 21/055 (2013.01) [G10L 19/022 (2013.01); G10L 19/167 (2013.01); H04N 21/2368 (2013.01); H04N 21/4302 (2013.01); H04N 21/4398 (2013.01); G10L 19/22 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An audio processing system for processing an audio bitstream, the audio processing system comprising:
a decoder for decoding the audio bitstream to determine audio frames, wherein each audio frame is temporally related to at least a video frame of a plurality of video frames;
a front-end component operating in a plurality of modes and configured to receive the audio frames and to process a current audio frame of the audio frames,
wherein the front-end component determines, from the plurality of modes, a selected mode for processing the current audio frame of the audio frames, wherein the selected mode is associated with a pre-assigned, mode-specific resampling factor that relates to an internal sampling frequency of the selected mode, wherein the current audio frame has audio samples with a sampling rate corresponding to the internal sampling frequency of the selected mode,
wherein the current audio frame has a frame length, and wherein at least a second audio frame of the audio frames has a different frame length, and wherein the front-end component is further configured to ensures that an audio frame rate of the current audio frame corresponds to a video frame rate of at least a first video frame of the plurality of video frames; and
a mode-dependent sample rate converter receiving the audio frames and using the resampling factor, wherein the resampling factor was chosen to match a quotient of a target external sampling frequency and a corresponding internal sampling frequency of the selected mode to output a reconstructed audio signal sampled at the target external sampling frequency, wherein the reconstructed audio signal is output with a block size corresponding to the external sampling frequency.