Inventor
MARUTA RIKIO
12 patents
⚠️ This page may combine multiple inventors who share the name “MARUTA RIKIO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON ELECTRIC CO
8 patentsUS4107470AAug 15, 1978
Digital SSB-FDM communication system derived from a complex band-pass digital filter bank and by a filter breakdown process
NIPPON ELECTRIC CO48 citations92
US4097860AJun 27, 1978
Offset compensating circuit
NIPPON ELECTRIC CO47 citations92
US4164021AAug 7, 1979
2M-point discrete Fourier transform calculator comprising a pre-processor for twice performing extraction of conjugate symmetric and/or antisymmetric components
NIPPON ELECTRIC CO22 citations81
US4392234AJul 5, 1983
PCM Signal interface apparatus
NIPPON ELECTRIC CO16 citations73
US4099029AJul 4, 1978
Asynchronous pcm common decoding apparatus
NIPPON ELECTRIC CO7 citations73
US4048447ASep 13, 1977
PCM-TASI signal transmission system
NIPPON ELECTRIC CO17 citations73
US4467315AAug 21, 1984
Digital compandor having nonlinear companding characteristics
NIPPON ELECTRIC CO3 citations62
US4393367AJul 12, 1983
Digital compandor having nonlinear companding characteristics
NIPPON ELECTRIC CO4 citations62
NEC CORP
4 patentsUS4935921AJun 19, 1990
Cross-connection network using time switch
NEC CORP27 citations88
US4554670ANov 19, 1985
System and method for ADPCM transmission of speech or like signals
NEC CORP21 citations79
US4684925AAug 4, 1987
Method and apparatus for converting an analog signal to a digital signal using an oversampling technique
NEC CORP19 citations73
US5144620ASep 1, 1992
Cross-connection network using time switch
NEC CORP12 citations69