Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-04-18
1989-12-05
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 37, 381 49, 381 51, G10L 300, G10L 500
Patent
active
048857904
ABSTRACT:
A sinusoidal model for acoustic waveforms is applied to develop a new analysis/synthesis technique which characterizes a waveform by the amplitudes, frequencies, and phases of component sine waves. These parameters are estimated from a short-time Fourier transform. Rapid changes in the highly-resolved spectral components are tracked using the concept of "birth" and "death" of the underlying sine waves. The component values are interpolated from one frame to the next to yield a respresentation that is applied to a sine wave generator. The resulting synthetic waveform preserves the general waveform shape and is perceptually indistinguishable from the original. Furthermore, in the presence of noise the perceptual characteristics of the waveform as well as the noise are maintained. The method and devices are particularly useful in speech coding, time-scale modification, frequency scale modification and pitch modification.
REFERENCES:
patent: 3296374 (1967-01-01), Clapper
patent: 3360610 (1967-12-01), Flanagan
patent: 3484556 (1969-12-01), Flanagan et al.
patent: 3978287 (1976-08-01), Fletcher et al.
patent: 3982070 (1976-09-01), Flanagan
patent: 4034160 (1977-07-01), Van Gerwen
patent: 4058676 (1977-11-01), Wilkes et al.
patent: 4076958 (1978-02-01), Fulghum
patent: 4701955 (1987-10-01), Taguchi
Malpass, "The Gold-Rabiner Pitch Detector In a Real Time Environment", Proc. of Eascon 1975 (Sep. 1975), pp. 1-7.
Gold, "Description of a Computer Program for Pitch Detection", Fourth International Congress, Copenhagen, Aug. 21-28, 1962.
Gold, "Note On Buzz-Hiss Detection", J. Acoust. Soc. Am., vol. 36, No. 9, pp. 1659-1661, 1964.
Holmes, "The JSRU Channel Vocoder", IEE Proc., vol. 127, No. 1 (1960).
Rabiner & Schafer, Digital Processing of Signal (Prentice Hall, 1978), pp. 225-238.
Markell, Linear Prediction of Speech (1967) (Springer-Verlog), pp. 227-262.
Almeida et al., "Variable-Frequency Synthesis: An Improved Harmonic Coding Scheme", IEEE, vol. 2, pp. 27.5.1-27.5.4 (1984).
Crochiere, "A Weighted Overlap-Add Methos of Short-time Fourier Analysis/Synthesis", IEEE, Trans. of Acoustics, Speech & Sig. Proc., vol. ASSP-28, 1980.
Silverman et al., "Transfer Characteristic Estimation for Speech Via Multirate Evaluation", IEEE, Pub. 75 CHO 998-5 Eascon, pp. 181-G to 181-E (1975).
"A Tone-Oriented Voice-Excited Vocoder" Hedelin; Chalmers University of Technology, Gothenburg, Sweden CH1610/5/81, pp. 205-208.
"A Representation of Speech With Partials" Hedelin; 1982 Elmevier Biological Press, The Representation of Speech in the Paripheral Auditory System, R. Carlson & B. Granstrom, pp. 247-250.
McAulay Robert J.
Quatieri, Jr. Thomas F.
Engellenner Thomas J.
Harkcom Gary V.
Knepper David D.
Massachusetts Institute of Technology
LandOfFree
Processing of acoustic waveforms does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Processing of acoustic waveforms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Processing of acoustic waveforms will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2039413