Method and apparatus for conditioning an audio signal subjected to lossy compression
An audio signal, audio technology, applied in the field of processing and equipment for lossy compressed audio signals, which can solve the problems of expensive, less effective, etc.
Active Publication Date: 2018-06-15
ASK IND GMBH
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Said known means are generally designed to be relatively (computationally) expensive and less efficient
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[0061] figure 1 A schematic diagram of a device 1 for processing a lossy compressed audio signal 2 is shown. Audio signal 2 can be, for example, a lossy compressed audio file. In particular, it can be, for example, an mp3-coded audio file (mp3 file) which is lossy compressed by means of the mp3 algorithm. Audio files have been able to be at least partially decoded. An audio file can contain, for example, a musical composition.
[0062] The device 1 shown in the exemplary embodiment forms part of an audio system or an audio device 3 of a motor vehicle 4 . Audio device 3 can be part of a vehicle-side multimedia device (not shown) for outputting multimedia content, in particular audio and / or video content, to passengers of motor vehicle 4 . The audio device 3 comprises at least one, for example configured as a loudspeaker device or at least one such integrated signal output device 5 , which is provided for acoustically outputting a processed audio signal 6 to at least one part ...
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The present invention relates to a method for conditioning an audio signal 2 subjected to lossy compression, comprising the following steps: provision of an audio signal 2 subjected to lossy compression, transfer of the audio signal 2 to a frequency spectrum in which energies of the audio signal 2 are correlated with frequencies of the audio signal 2, ascertainment of the frequencies fi of local amplitude maxima in the frequency spectrum, stipulation of a first selection criterion and preselection of the frequencies fi of two directly successive local amplitude maxima, which frequencies satisfy the first selection criterion, - stipulation of a second selection criterion and selection of preselected frequencies fi, satisfying the first selection criterion, of two directly successive local amplitude maxima, which frequencies additionally satisfy the second selection criterion, generation of an audio filler signal (AFS) and - conditioning of the audio signal 2 by introducing the audio filler signal (AFS) into a frequency range between the frequencies fi that satisfy the second selection criterion, so that the frequency range is filled with the audio filler signal (AFS) at least in sections, in particular completely.
Description
technical field [0001] The invention relates to a method for processing lossy compressed audio signals. Background technique [0002] Data compression of audio signals or information, such as music files, is known per se. The purpose of data compression is to reduce the data size of the corresponding audio signal. The data compression can in principle be performed losslessly or losslessly. In addition, loss-inducing data compression, which can be achieved, for example, by data suppression of frequency components at the edge of the human hearing range, should be considered in particular. This should hardly impair the subjective perception of hearing through the earpiece. [0003] Due to the relative reduction in sound quality of a lossy compressed audio signal, it is sometimes desirable to process a lossy compressed audio signal, that is to say at least partially restore the correspondingly lost frequency components or replace them by similar frequency components . [00...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G10L19/02G10L21/02
CPCG10L19/0208G10L21/0364G10L19/0017G10L19/008G10L19/012
Inventor D·佩尔里奇内夫
Owner ASK IND GMBH