Apparatus and method for extracting an ambient signal in an apparatus and method for obtaining weighting coefficients for extracting an ambient signal and computer program
A technology of environmental signals and signals, applied in the field of obtaining weighting coefficients, devices for extracting environmental signals, and devices for weighting coefficients, can solve problems such as not giving technical details
Active Publication Date: 2010-08-25
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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An apparatus for extracting an ambient signal from an input audio signal comprises a gain-value determinator configured to determine a sequence of time-varying ambient signal gain values for a given frequency band of the time-frequency distribution of the input audio signal in dependence on the input audio signal. The apparatus comprises a weighter configured to weight one of the sub-band signals representing the given frequency band of the time-frequency-domain representation with the time-varying gain values, to obtain a weighted sub-band signal. The gain-value determinator is configured to obtain one or more quantitative feature-values describing one or more features of the input audio signal and to provide the gain-value as a function of the one or more quantitative feature values such that the gain values are quantitatively dependent on the quantitative values. The gain value determinator is configured to determine the gain values such that ambience components are emphasized over non-ambience components in the weighted sub-band signal.
Description
Apparatus and method for extracting environmental signal and computer program in apparatus and method for obtaining weighting coefficient for extracting environmental signal technical field Embodiments according to the present invention relate to an apparatus for extracting an ambient signal, and to an apparatus for obtaining weighting coefficients for extracting an ambient signal. Some embodiments according to the invention relate to methods for extracting ambient signals and to methods for obtaining weighting coefficients. It is an object of some embodiments according to the present invention to extract a front signal and an ambient signal from an audio signal with low complexity for upmixing. Background technique An introduction is given below. 1 Introduction Multi-channel audio material is becoming increasingly popular in consumer home entertainment. This is largely due to the fact that movies on DVD offer 5.1 multi-channel sound, so even home users, who typical...
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IPC IPC(8): H04S5/00G10L21/034
CPCH04R5/04
Inventor 克里斯丁·乌勒于尔根·赫勒斯特凡·盖尔斯贝格法尔科·里德布赫安德烈亚斯·沃尔特奥立弗·莫瑟尔
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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