초록 ▼

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 sequent

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.

대표청구항 ▼

[ What is claimed is:] [6.] An apparatus for concurrently changing a tempo and a pitch of an audio signal according to tempo designation information and pitch designation information, the apparatus comprising:a memory section that memorizes the audio signal composed of original amplitude values sequ

[ What is claimed is:] [6.] An apparatus for concurrently changing a tempo and a pitch of an audio signal according to tempo designation information and pitch designation information, the apparatus comprising:a memory section that 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 that 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 that 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 that 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 that 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; anda connecting section that smoothly connecting 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.