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21. 发明专利

JPH11133966A WAVEFORM GENERATOR 失效
公开(公告)号：JPH11133966A
公开(公告)日：1999-05-21
申请号：JP30945097
申请日：1997-10-27
申请人： YAMAHA CORP
发明人： TAKEUCHI KAZUFUMI
IPC分类号： G10H5/00 , G10H5/10
摘要： PROBLEM TO BE SOLVED: To generate waeform data limiting the band area, by a digital processing. SOLUTION: By integrating a frequency number f to specify the pitch of a generating waveform by a digital integrator which consists of an adder 2 and a delay circuit 3, a serrate waveform data A is produced. This waveform data A is multiplied with a correcting data output from a window function table 10, in a multiplier 11, so as to output a serrate waveform data E receiving a specific band area limitation. The window function table 10 stores a data corresponding to the error between the serrate waveform and the serrate waveform having the band area limitation, and by reading the window function table 10 through an adder 5 to shift the phase 180 deg. in order to make the discontinuous point of the serrate waveform data A to a cross point; a multiplier to multiply the output of the adder 5 with the output of an inverse table 4; a shifter 7; a limiter 8; and an absolute valve circuit 9; a specific number of sample values before and after the discontinuous point of the serrate waeform can be read out.

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