| 摘要 |
An electronic gaming device (10) (e.g., a so-called "videogame" type portable electronic game including a raster scanned liquid crystal display panel (14) and user controls (18)) includes a pseudo-stereo sound generator (58). Plural independent sound generating circuits (541-544) produce audio signals under microcomputer (22) control and the microcomputer (22) may route the outputs of the plural sound generating circuits (541-544) independently to one or the other (or both) of two independent audio channel outputs. Pseudo-stereo sound is thus produced when a stereo headset (64) is used to listen to the sounds produced. A selecting circuit (202) automatically mixes the two audio channel (SO1, SO2) outputs together and provides them in monaural form to an internal loudspeaker (62) when no such stereophonic headset (64) is connected. The microcomputer (22) controls generation of sounds and music in accordance with a musical pitch (frequency) data structure (312), a musical duration data structure (314) and a musical score data structure (316) stored in the interchangeable memory cartridge (16). The musical score data structure (316) specifies pitch and duration in terms of address offsets into the pitch and duration data structures (312, 314). Program control instructions (310) controlling sound generation thus need not explicitly specify the actual control data written to the sound generator (58) to produce musical notes of desired pitches, durations and other characteristics. |
