| 摘要 |
PROBLEM TO BE SOLVED: To obtain a digital tone signal generation circuit with a simple configuration without using a special IC circuit by reading repeatedly PCM code data which are stored in a 2nd storing means and generating a digital tone signal. SOLUTION: An ROM 2 stores various PCM code data which become the base of a digital tone signal that is sent to a PCM highway 30. An RAM 3 stores 1st and 2nd PCM code data which are selected from the ROM 2 according to an instruction from a CPU 1. A memory data transfer controlling part 4 repeatedly reads each PCM code data of the RAM 3 and generates a tone signal (parallel data) to the highway 30. PCM code data are converted into serial data by a data converting part 5 and sent as a tone signal to the highway 30. A tone signal that is generated variously changes according to the settings by an optional sending counter 7, a regular sending counter 8, an optional sending counter starting part 9, a regular sending counter repeat setting part 10, etc. |
