Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1986-09-11
1989-01-10
Shoop, Jr., William M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 37, 381 38, 381 41, 381 51, G10L 500
Patent
active
047979267
ABSTRACT:
A speech analyzer and synthesizer system using sinusoidal encoding and decoding techniques for voiced frames and noise excitation or multiple pulse excitation for unvoiced frames. For voiced frames, the analyzer transmits the pitch, values for each harmonic frequency by defining the offset from integer multiples of the fundamental frequency, total frame energy, and linear predictive coding, LPC, coefficients. The synthesizer is responsive to that information to determine the phase of the fundamental frequency and each harmonic based on the transmitted pitch and harmonic offset information and to determine the amplitudes of the harmonics utilizing the total frame energy and LPC coefficients. Once the phase and amplitudes have been determined for the fundamental and harmonic frequencies, the sinusoidal analysis is performed for voiced frames. For each frame, the determined frequencies and amplitudes are defined at the center of the frame, and a linear interpolation is used both to determine continuous frequency and amplitude signals of the fundamental and the harmonics throughout the entire frame by the synthesizer. In addition, the analyzer initially adjusts the pitch so that the harmonics are evenly distributed around integer multiples of this pitch.
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"A Background for Sinusoid Based Representation of Voice Speech", Jorge S. Marques and Luis B. Almeida, ICASSP 1986, pp. 1233-1236.
"Mid-Rate Coding Based on a Sinusoidal Representation of Speech", Robert J. McAulay and Thomas F. Quartieri, ICASSP 85, vol. 3 of 4, pp. 944-948.
"Variable-Frequency Synthesis: An Improved Harmonic Coding Scheme", Luis B. Almeida and Fernando M. Silva, ICASSP 84, vol. 2 of 3, pp. 27.5.1-27.5.4.
"Magnitude-Only Reconstruction Using a Sinusoidal Speech Model", R. J. McAulay and T. F. Quatieri, IEEE 1984, pp. 27.6.1-27.6.4.
Bronson Edward C.
Hartwell Walter T.
Kleijn Willem B.
Prezas Dimitrios P.
American Telephone and Telegraph Company AT&T Bell Laboratories
Moran John C.
Shoop Jr. William M.
Young Brian
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