Inventor
UNAGAMI SHIGEYUKI
JP19 patents
Patents
19 patentsUS5261027ANov 9, 1993
Code excited linear prediction speech coding system
FUJITSU LTD122 citations97
US5115469AMay 19, 1992
Speech encoding/decoding apparatus having selected encoders
FUJITSU LTD79 citations96
US5086471AFeb 4, 1992
Gain-shape vector quantization apparatus
FUJITSU LTD68 citations96
US5091955AFeb 25, 1992
Voice coding/decoding system having selected coders and entropy coders
FUJITSU LTD71 citations94
US5528687AJun 18, 1996
Echo canceller
FUJITSU LTD29 citations92
US5263119ANov 16, 1993
Gain-shape vector quantization method and apparatus
FUJITSU LTD29 citations92
US5224167AJun 29, 1993
Speech coding apparatus using multimode coding
FUJITSU LTD36 citations92
US5159611AOct 27, 1992
Variable rate coder
FUJITSU LTD31 citations92
US5138662AAug 11, 1992
Speech coding apparatus
FUJITSU LTD48 citations92
US4890325ADec 26, 1989
Speech coding transmission equipment
FUJITSU LTD35 citations92
US4571733AFeb 18, 1986
Automatic equalization device and method of starting-up the same
FUJITSU LTD32 citations92
US4831636AMay 16, 1989
Coding transmission equipment for carrying out coding with adaptive quantization
FUJITSU LTD37 citations91
US4951269AAug 21, 1990
Echo canceller with short processing delay and decreased multiplication number
FUJITSU LTD34 citations89
US5103481AApr 7, 1992
Voice detection apparatus
FUJITSU LTD20 citations82
US4312075AJan 19, 1982
Timing-phase recovery circuit
FUJITSU LTD20 citations79
US5274741ADec 28, 1993
Speech coding apparatus for separately processing divided signal vectors
FUJITSU LTD19 citations74
US4482973ANov 13, 1984
Digital automatic gain control circuit
FUJITSU LTD17 citations71
US4445224AApr 24, 1984
Pull-in circuit for a digital phase locked loop
FUJITSU LTD11 citations71
US5231692AJul 27, 1993
Pitch period searching method and circuit for speech codec
FUJITSU LTD3 citations62