1
Akihiko Sugiyama: Variable length block coding with changing characteristics of input samples. NEC Corporation, Ostrolenk Faber Gerb & Soffen, November 24, 1992: US05166686 (71 worldwide citation)

In a communications system, input digital samples are continuously stored into a buffer and successively divided into a group of blocks of different lengths. The samples of each of the blocks are encoded into linear transform coefficients at intervals corresponding to the length of each block and ea ...


2
Akihiko Sugiyama: Method of identifying an unknown system with a band-splitting adaptive filter and a device thereof. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, May 14, 1996: US05517435 (66 worldwide citation)

A method and apparatus for identifying an unknown system to provide less computation and a shorter convergence time by controlling the number of taps of adaptive filters corresponding to each subband. The apparatus includes devices for, and the method includes steps of, splitting an input signal to ...


3
Tatsuo Tanaka, Hiroshi Itoh, Akihiko Sugiyama: Air conditioner. Tokyo Shibaura Denki Kabushiki Kaisha, Cushman Darby and Cushman, January 29, 1985: US04495779 (52 worldwide citation)

An air conditioner has a refrigeration cycle and a regulating circuit. The refrigeration cycle includes a compressor of variable exhaust amount type, a 4-way valve connected to the discharge side and suction side of the compressor, indoor-side and outdoor-side heat exchanges connected to the valve, ...


4
Akihiko Sugiyama: Method and apparatus capable of quickly identifying an unknown system even on occurrence of a plurality of dispersive portions. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, October 3, 1995: US05455819 (46 worldwide citation)

In an identification apparatus for identifying an unknown system in response to a transmission input signal and an echo signal which includes multiple echoes sent through the unknown system, a plurality of adaptive filters each of which has a plurality of taps are supplied with the transmission sign ...


5
Akira Kanemasa, Akihiko Sugiyama: Decision feedback equalizer with a pattern detector. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, March 8, 1988: US04730343 (42 worldwide citation)

An improved decision feedback equalizer, which removes intersymbol interference from pulse transmissions having a desired period, includes an arithmetic circuit (9) for extracting a residual intersymbol interference signal from a residual signal and a delayed residual signal which is produced by del ...


6
Akihiko Sugiyama: Method and apparatus for controlling coefficients of adaptive filter. NEC Corporation, Ostrolenk Faber Gerb & Soffen, July 12, 1994: US05329472 (40 worldwide citation)

A method or apparatus for controlling coefficients of an adaptive filter (3) for identifying unknown system or predicting periodic signals by correcting coefficients of the adaptive filter (3) in such a manner that the difference signal obtained by subtracting an output signal of the adaptive filter ...


7
Akihiko Sugiyama, Masahiro Iwadare, Takao Nishitani: Adaptive transform coding by selecting optimum block lengths according to variatons between successive blocks. NEC Corporation, Ostrolenk Faber Gerb & Soffen, August 10, 1993: US05235623 (30 worldwide citation)

Subblocks of input digital samples are stored into a buffer at frame intervals and segmented into blocks having an integral multiple of the length of the subblock. Each block is encoded into transform coefficients and stored into a memory. Each coefficient is squared and those of the squared transfo ...


8
Akihiko Sugiyama: Adaptive filter capable of quickly identifying an unknown system. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, September 14, 1993: US05245561 (28 worldwide citation)

In an adaptive filter formed by first through N-th delay elements connected in series to one another to define first through N-th taps, first through M-th coefficient circuits which are smaller in number than the delay elements and which produce first through M-th coefficient signals together with f ...


9
Akihiro Hirano, Akihiko Sugiyama: Multi-channel echo canceling method and apparatus. NEC Corporation, Ostrolenk Faber Gerb & Soffen, March 7, 1995: US05396554 (26 worldwide citation)

Echo canceling method and apparatus for subtracting, from a mixed signal in which echoes produced from a plurality of reception signals are mixed with a transmission signal, a replica of the echoes in order to cancel the echoes in the mixed signal. The replica of the echoes are generated by the step ...


10
Takehiko Kodama, Naoto Saeki, Akihiko Sugiyama, Naoyasu Funada, Masato Nonaka: Sheet post-processing unit and image forming apparatus. Canon Finetech, Fitzpatrick Cella Harper & Scinto, July 1, 2008: US07392983 (16 worldwide citation)

There is provided a sheet post-processing unit and image forming unit, which is capable of stably conveying sheets discharged one after another to a tray to form a bundle of sheets and to staple the bundle. A sheet conveying means is provided for selectively conveying the sheet to be discharged in t ...