Abstract: A game apparatus includes an operating switch and a microphone. A player operates a player object through intuition by the operating switch or inputting a sound. The number of zero crossings contained in waveform of a sound input through the microphone is detected, and also individual interval times between the zero crossings are detected. Then, it is determined whether or not the distribution of the interval times, i.e. the frequency distribution matches the distribution of interval times (frequency distribution) related to a breath sound stored in advance. If there is a match between the two, the input sound is recognized as a breath sound, and a game process based on the breath (wind) is carried out. For example, a game screen depicting the breath or wind is displayed on an LCD.

Abstract: A game apparatus includes an operating switch and a microphone. A player operates a player object through intuition by the operating switch or inputting a sound. The number of zero crossings contained in waveform of a sound input through the microphone is detected, and also individual interval times between the zero crossings are detected. Then, it is determined whether or not the distribution of the interval times, i.e. the frequency distribution matches the distribution of interval times (frequency distribution) related to a breath sound stored in advance. If there is a match between the two, the input sound is recognized as a breath sound, and a game process based on the breath (wind) is carried out. For example, a game screen depicting the breath or wind is displayed on an LCD.

Abstract: Engine sounds corresponding to traveling actions of a car object in a game space are reproduced using previously recorded sound data obtained by running a real car, and therefore it is possible to reproduce engine sound close to a real engine's sound. When the car object is accelerating, corresponding acceleration sound data can be sequentially read and reproduced. Further, a deceleration sound data read position can be designated such that when the car object is operated so as to start decelerating during acceleration, deceleration sound data can be reproduced from a position corresponding to a position where reproduction of the acceleration sound data is stopped, whereby it is possible to combine the acceleration sound data and the deceleration sound data together so as not to result in unnatural sound data.