Pitch extracting apparatus having means for measuring interval b

Details Pitch extracting apparatus having means for measuring interval b Pitch extracting apparatus having means for measuring interval b

1993-11-17

1994-09-20

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84654, 84454, 84DIG18, G10H 702

Patent

active

053491300

ABSTRACT:
A CPU measures the interval between the zero-crossing points at the two ends of a waveform element a having, e.g., a positive polarity. Thereafter, the CPU sequentially measures the interval between the zero-crossing points at the two ends of each of waveform elements b, c, and d having the same polarity. Upon detection of the waveform element d which is almost equal in interval to the waveform element a and is located nearest thereto in terms of time, the interval between the start points (zero-crossing points) of the waveform elements a and d is extracted as the pitch period of the input waveform. Subsequently, the above-described series of operations is repeated.

REFERENCES:
patent: 4429609 (1984-02-01), Warrender
patent: 4633748 (1987-01-01), Takashima et al.
patent: 4688464 (1987-08-01), Gibson et al.
patent: 5018428 (1991-05-01), Uchiyama et al.

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