Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1996-08-29
1997-10-07
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375240, 370477, 370480, 395 291, 395 294, 348388, 386112, H04K 110
Patent
active
056756100
ABSTRACT:
A first and second channel digital data are transformed into data, respectively, on a frequency axis on a block-by-block basis to thereby generate a first and second channel coefficient data on a frequency-by-frequency basis. It is detected on a frequency-by-frequency basis whether or not sign of the first channel coefficient data coincides with that of the second channel coefficient data, wherein unless both of them are met, either the sign of the first channel coefficient data or that of the second channel coefficient data is inverted. Mean values of the first channel coefficient data and the second channel coefficient data both of which have the respective signs made to coincide with each other are determined to thereby generate shared-channel data. The shared-channel data is divided into a plurality of sub-bands each of which contains a single or a plurality of the shared-channel data. The shared-channel data divided undergoes a floating-point transform on a subband basis for thereby generating one subband-common exponent data and a plurality of mantissa data.
REFERENCES:
patent: 5583962 (1996-12-01), Davis et al.
patent: 5596421 (1997-01-01), Shibata et al.
Co-pending U.S. Patent Application SN. 08/697,728.
Furui et al., Advances in Speech Signal Processing, Marcel Dekker, Inc., pp. 109-141, 1991.
Princen et al., Analysis/Synthesis Filter Bank Design Based On Time Domain Aliasing Cancellation, IEEE Transaction on Acoustic, Speech, and Signal Processing, ASSP-34, No. 5, pp. 1153-1161, Oct. 1986.
Chin Stephen
Le Amanda T.
Nippon Steel Corporation
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