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AssigneeKabushiki Kaisha Kenwood
InventorYasushi Sato
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A device and a method for compressing signal information by removing (thinning out) the signal component of a signal in a specific frequency band. Firstly, an input time-series signal (e.g., a PCM signal) is converted by an analyzer (11) into a spectrum signal. Next, of the bands obtained by dividing the spectrum equally into bands, the band having a predetermined or higher correlation in the spectrum distribution with the lower frequency band is specified as a harmonic band by a frequency band masking unit (12). Then, a removal band from which the spectrum is to be removed is determined from the harmonic band, and the spectrum signal of this removal band, from which the spectrum component has been removed (namely the frequency component has been thinned out), is fed to a synthesizer (13). Lastly, the synthesizer (13) converts the spectrum signal having the thinned frequency component into a time-series signal. As a result, the compression of the information signal can be highly efficiently realized, and the high quality of an audio signal is retained in the case of a compression ration as high as that of the prior art.
A frequency thinning device for compressing a given signal by removing signal components in a specific frequency band, wherein frequency spectrum signals in a plurality of frequency bands are generated, and if a spectrum pattern in one frequency band among the plurality of frequency bands has a correlation not smaller than a predetermined degree with a spectrum pattern in another frequency band, signal components in the other frequency band are removed.
A frequency thinning device comprising:
A frequency thinning method for compressing a given signal by removing signal components in a specific frequency band, wherein frequency spectrum signals in a plurality of frequency bands are generated, and if a spectrum pattern in one frequency band among the plurality of frequency bands has a correlation not smaller than a predetermined degree with a spectrum pattern in another frequency band, signal components in the other frequency band are removed.
A computer readable storage medium storing a program for realizing functions of:
Dependencies are inferred from the claim text.