| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a game machine which can restrict increase in production costs and installing space even in the adoption of a circuit structure so designed as to output a large volume of sound from a plurality of loudspeakers. Ž<P>SOLUTION: A digital amplifier 74 installed on the game machine includes: a first comparator CMPa which receives a primitive voice signal V+ and a triangle wave TRI respectively at its first and second input terminals; a second comparator CMPb which receives an inverted signal V- of the primitive voice signal and a triangle wave TRI at its first and second input terminals; and a pair of output circuits INV+ and INV- which are connected to the output terminals of the pair of comparators CMPa and CMPb to output signals OUT+ and OUT- of the digital amplifier. The output signals OUT+ and OUT- are supplied to loudspeakers SP without going through a filter circuit substantially. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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