Frequency thinning apparatus for thinning out frequency...

Details Frequency thinning apparatus for thinning out frequency... Frequency thinning apparatus for thinning out frequency...

2007-08-14

2007-08-14

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240000, C375S240110, C375S240250, C375S240010, C382S232000

Reexamination Certificate

active

10362425

ABSTRACT:
An analyzer transforms a digital signal into a spectrum representing the digital signal. A spectrum analyzing unit specifies a predetermined number of sets of the bands in decreasing order of the correlation between the spectrum distributions from among the bands obtained by equally dividing the above spectrum into equal bands, and then specifies one of the two specified bands as a removed band and the other as a interpolation band. Then, a frequency shifting unit removes spectrum components within the removed bands and shifts spectrum components within another bands to the lower frequency side (that is, performs the thinning and compressing of frequency), and then supplies a signal representing the spectrum after thinning and compressing to a synthesizer. The synthesizer generates a signal represented by the spectrum after thinning and compressing. Thereby, even a signal having a high-frequency part steeply attenuated can be compressed in its bandwidth in such a manner that it can be exactly restored later, and/or an audio signal information can be compressed keeping high audio quality.

REFERENCES:
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patent: 6449596 (2002-09-01), Ejima
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International Search Report, PCT/JP01/05522, mailed Oct. 9, 2001.

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