| 摘要 |
PURPOSE:To reduce errors of communication and make the communication speed high, by blocking the received Morse code by the character unit and by generating sound with these characters. CONSTITUTION:The ROM address signal output from Morse code detecting device 10 is given to ROM3. ROM3 gives designated sound parameters to pulse code generator 4 in order. Pulse code generator 4 generates a periodical pulse code string of a pitch which is designated by pitch data out of parameters given from ROM3. This pulse code string is input to digital filter 5, and filtering is performed by the coefficient designated by ROM3. The signal which passed through digital filter 5 is applied to D/A converter 6 and becomes an analogue signal to drive speaker 7. |
