1
Toru Baji, Yukio Nakano, Shiro Tanabe, Tetsuya Nakagawa, Hirotsugu Kojima: Multimedia bidirectional broadcast system. Hitachi, Pennie & Edmonds, June 25, 1991: US05027400 (738 worldwide citation)

A multimedia bidirectional broadcast system including a broadcast station and subscriber terminals. The broadcast station includes a main control unit having therein a data base control table in which program and commerical down load sequences are recorded depending on a setting effected by a subscr ...


2
Hirotsugu Kojima, Avadhani Shridhar: Method and apparatus for reducing the power consumption in a programmable digital signal processor. Hitachi America, Flehr Hohbach Test Albritton & Herbert, March 9, 1999: US05880981 (67 worldwide citation)

The present invention contemplates an improved multiplier circuit and method for reducing power consumption by reducing the number of transitions to the input of the multiplier. Each input to the multiplier is fixed for as long as possible by reordering the sequence of the multiplications to take ad ...


3
Hirotsugu Kojima, Katsuro Sasaki: High speed, reduced power memory system implemented according to access frequency. Hitachi America, Flehr Hohbach Test Albritton & Herbert, November 11, 1997: US05687382 (30 worldwide citation)

A memory system including a first memory area (MEM-A) implemented using memory units including low threshold voltage transistors powered by a low supply voltage source, and a second memory area (MEM-B) implemented using memory units including higher threshold voltage cells powered by a higher supply ...


4
Junko Nakase, Hirotsugu Kojima: Digital filter circuit. Hitachi, Antonelli Terry Stout & Kraus, June 22, 1993: US05222035 (27 worldwide citation)

When each sample is expressed by digital signals of 8 bits, 8 bits constituting each of the digital signals are divided into data of upper 5 bits including the most significant bit, and data of lower 4 bits including the least significant bit. These two data are respectively inputted to two filter c ...


5
Naoki Sato, Yasuhide Ouchi, Hirotsugu Kojima, Hideki Sawaguchi, Yosuke Hori: Magnetic recording and reproducing apparatus, reproduction signal processing apparatus, and reproduction signal processing method. Hitachi, Antonelli Terry Stout & Kraus, March 21, 1995: US05400189 (23 worldwide citation)

A reproduction signal processing apparatus includes a memory circuit storing a predetermined pattern for deciding equalizing characteristics of an automatic equalizer in response to variation of a reproduction signal, a pattern converting circuit for converting the predetermined pattern outputted fr ...


6
Toru Baji, Hirotsugu Kojima, Nario Sumi, Yoshimune Hagiwara, Shinya Ohba: High speed digital signal processor capable of achieving realtime operation. Hitachi, Hitachi Device Engineering Co, Antonelli Terry Stout & Kraus, July 31, 1990: US04945506 (20 worldwide citation)

A digital signal processor for computing a vector product between a column vector input signal including a plurality of data items (x0, x1, x2, . . . , x7) and a matrix including a predetermined number of coefficient data items so as to produce a column vector output signal including a plurality of ...


7
Norio Sumi, Hirotsugu Kojima, Junko Nakase: Semiconductor operation device with memory for storing operation codes connected from coefficients prior to performing an operation on an input signal. Hitachi, Hitachi Device Engineering, Antonelli Terry Stout & Kraus, August 10, 1993: US05235538 (16 worldwide citation)

The present invention features performance of operation processing between a signal obtained by converting a coefficient into a Booth code with a Booth encoder, storing the Booth code in a memory device in advance and reading out the stored Booth code for processing an input signal in a semiconducto ...


8
Hirotsugu Kojima, Teruo Kitamura: Semiconductor integrated circuit and electronic system. Renesas Technology, Miles & Stockbridge PC, February 27, 2007: US07185244 (13 worldwide citation)

The invention provides a semiconductor integrated circuit for communication control and a wireless communication system using the same realizing reduction in the size of a chip and the size of a module by enabling trimming data to be written into a nonvolatile memory without increasing the number of ...


9
Hiromichi Sugie, Tsuyoshi Minari, Yasunari Arai, Yukihisa Horikoh, Kouji Kume, Hirotsugu Kojima: Filter element for air cleaner. Toyoda Boshoku Corporation & Denso Corporation, Palmatier Sjoquist Voigt & Christensen P A, December 22, 1998: US05851250 (11 worldwide citation)

A filter element for an air cleaner including a filter medium which has a plurality of basic filter units and is integrally formed of a porous sintered material produced by sintering powdered synthetic resin.


10
Hirotsugu Kojima, Atsushi Kiuchi, Yuichi Takitsune, Katsumi Yamamoto: Wireless communication system and microcomputer. Renesas Technology Corporation, Mattingly Stanger Malur & Brundidge P C, May 1, 2007: US07212786 (11 worldwide citation)

Providing a wireless communication device that, even if clock stop of a radio frequency part is controlled by a baseband part operating on the same clock signal, can resume clock oscillation, and makes it easy to time the clock reactivation to other operations based on a shared clock. The wireless c ...



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