Music – Instruments – Electrical musical tone generation
Patent
1998-09-15
1999-09-14
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84607, 84612, 84652, 84DIG12, G10H 140, G10H 704, G10H 712
Patent
active
059525967
ABSTRACT:
A pitch/tempo converting apparatus is constructed for concurrently changing a tempo and a pitch of an audio signal according to tempo designation information and pitch designation information. In the apparatus, a memory section memorizes the audio signal composed of original amplitude values sequentially sampled at original sampling points timed by an original sampling rate within an original frame period. A tempo converting section converts the original frame period into an actual frame period by varying a length of the original frame period according to the tempo designation information so as to change the tempo of the audio signal. A pitch converting section converts each of the original sampling points into each of actual sampling points by shifting each of the original sampling points according to the pitch designation information so as to change the pitch of the audio signal. An interpolating section calculates each of actual amplitude values at each of the actual sampling points by interpolating the original amplitude values sampled at original sampling points adjacent to the actual sampling point. A reading section sequentially reads the actual amplitude values by the original sampling rate during the actual frame period so as to reproduce a segment of the audio signal within the actual frame period. A connecting section smoothly connects a series of the segments reproduced by repetition of the actual frame period to thereby continuously change the tempo and the pitch of the audio signal.
REFERENCES:
patent: 5069105 (1991-12-01), Iba et al.
patent: 5131042 (1992-07-01), Oda
patent: 5553011 (1996-09-01), Fujita
patent: 5567901 (1996-10-01), Gibson et al.
Witkowski Stanley J.
Yamaha Corporation
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