公开(公告)号：US11545160B2

公开(公告)日：2023-01-03

申请号：US16863439

申请日：2020-04-30

Applicant: Axis AB

Inventor： Mersad Jelacic ,  Marcus Tedenvall ,  Markus Gerard ,  Xing Danielsson Fan ,  Ricard Wanderlöf

IPC: G10L19/02 ,  G10L19/002 ,  G06N7/00 ,  H04L65/70 ,  H04L65/75

Abstract: A method, a computer program product, an encoder and a monitoring device for encoding an audio signal with variable bitrate, wherein: an audio signal comprising a plurality of successive audio frames is received; and for each successive audio frame of the audio signal: the audio frame is represented in a frequency domain with respect to a plurality of frequency sub-bands; the audio frame is classified in each frequency sub-band as either background or foreground using a background model specific to the frequency sub-band; each successive audio frame of the audio signal is encoded, wherein a number of bits is allocated for each frequency sub-band of the audio frame, wherein the number of bits allocated for a frequency sub-band is higher if the audio frame is classified as foreground in the frequency sub-band than if the audio frame is classified as background in the frequency sub-band.