Patent ID: 7257161
Filing Date: 2007-08-14
Classification: G10L,H03M

Abstract:
1. A frequency thinning apparatus for performing compression of signal information by removing specified frequency components in a given time sequence signal, said apparatus comprising: means for transforming the given time sequence signal into a frequency spectrum signal; removal band decision means for determining correlation factors for all the possible combinations of selected two bands, determining, in decreasing order of the correlation factors, a predetermined number X of the combinations among all the combinations of which the correlation factors have been determined, determines the X bands as removal bands by selecting, without duplication, one band as a removal band for each of the determined X combinations, and removing the frequency components; means for compressing the total length of a continuous spectrum distribution by shifting residual frequency components not removed toward the lower frequency side so as to reduce space in said removed frequency-band; and means for inversely transforming the spectrum signal having the compressed total length of said continuous spectrum distribution into a time sequence signal, wherein said removal band decision means further has means for outputting information indicative of the removal bands.