Kabushiki Kaisha Sega Enterprises

Teruo Okabe

Hiroshi Yagi

Keisuke Yasui

Device for synchronizing audio and video outputs in computerized games

Methods and systems consistent with the present invention provide an arithmetic unit, which uses a high speed yet small circuit, using a highly precise method for numerical interpolation that uses Newton-Raphson method. A table for referencing sampling values and operation results is stored successively and alternately in two simultaneously accessible memories 422, 423. A table reference address determining portion 4211 takes the table reference address from the input B. The access control circuit 4212 prepares an address for accessing each memory from the table reference address and reads table values. The interpolation operating portion 4213 interpolates the table value at a precision of half the final precision. The Newton-Raphson operation 4214 performs the Newton-Raphson operation once with the primary interpolated numerical value as the initial value and attains the calculation results with the final precision by precise square convergence.

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Tokyo, Japan

Teruo Okabe