Apparatus and method for playing back audio at faster or slower

Details Apparatus and method for playing back audio at faster or slower Apparatus and method for playing back audio at faster or slower

1992-09-25

1995-01-31

MacDonald, Allen R.

395 269, G10L 900

Patent

active

053864930

ABSTRACT:
A computer implemented apparatus and method for modifying the playback rate of a previously stored audio or voice data file stored within a computer system without altering the pitch of the audio data file as originally stored. The present invention also maintains a high level of sound quality during playback. The present invention includes a double buffering system in order to perform all of the desired calculations in real time. A time stretching technique is employed upon the audio data file to decrease or increase playback rate which creates audio segments requiring joining processing. Junctions are smoothed by employing a cross-fade amplitude envelope filter and a compressor/limiter is used to maintain filter range. The system may operate on a desktop computer allowing for advantageous playback and audio data management options of stored voice and or sound data.

REFERENCES:
patent: 4375083 (1983-02-01), Maxemchuk
patent: 4441201 (1984-04-01), Henderson et al.
patent: 4852168 (1989-07-01), Spraque
Kamel, R., Emami, K., and R. Eckert. "PX: Supporting Voice in Workstations" IEEE pp. 73-80, Aug. 1990.
Ades, S. and D. Swinehart. "Voice Annotation and Editing in a Workstation Environment" Xerox Parc. CSL-86-3, Sep. 1986, pp. 1-20.
Lent, Keith. "An Efficient Method for Pitch Shifting Digitally Sampled Sounds" Computer Music Journal, vol. 13, No. 4. 1989, pp. 65-71.

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