Abstract: It is an object of this invention to provide a game device capable of accurately synchronizing the display of pictures with sounds. A game device for displaying a sound source object, which is virtually considered to be a sound source, on a screen and for producing a sound related to the sound source object from a built-in sound source is designed to obtain an audio parameter which defines a sound to be outputted from the sound source on the basis of a display parameter of an object, the display parameter determining the mode of displaying the sound source object as a picture, and to set the audio parameter at the sound source. As a result, the formation of pictures of the sound source object and the control of the sound source are performed in the same frame cycle for the display of pictures and, therefore, the display of pictures of the object is synchronized with the production of sounds.

Abstract: 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.