| 摘要 |
A wave generation circuit is disclosed, in which a complex waveform can be generated without increasing the ROM data amount or increasing the reading rate. Waveform data relating to a waveform and the generation thereof are stored in a ROM (651) for each cycle. An address signal for reading the waveform data sequentially is produced sequentially by an address generation circuit (71,81). The waveform data read out are sequentially reproduced into a waveform signal by a waveform data output circuit (73,84). In a wave generating circuit including the ROM and the address generation circuit (71,81),the waveform data includes the extension information instructing to extend and reproduce the waveform data for a particular cycle. An extension and control circuit (72) included in the wave generation circuit decides on the presence or absence of the extension information from the read waveform data, and in the presence of the extension information, controls the waveform data output circuit (73,84) to maintain the output of a corresponding waveform signal while at the same time controlling the address generation circuit (71,81) to retard the generation of the address signal. The wave generation circuit can generate a single waveform data in an extended form according to the extension information when the same data continues for a plurality of cycles, thereby reducing the waveform data amount and the ROM capacity. <IMAGE> |
