Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1986-09-11
1988-09-13
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 53, G10L 500
Patent
active
047714654
ABSTRACT:
A speech analyzer and synthesizer system using a sinusoidal encoding and decoding technique for voiced frames and noise excitation or multipulse excitation for unvoiced frames. For voiced frames, the analyzer transmits the pitch, values for a subset of offsets defining differences between harmonic frequencies and a fundamental frequency, total frame energy, and linear predictive coding, LPC, coefficients. The synthesizer is responsive to that information to determine the harmonic frequencies from the offset information for a subset of the harmonics and to determine the remaining harmonics from the fundamental frequency. The synthesizer then determines the phase for the fundamental frequency and harmonic frequencies and determines the amplitudes of the fundamental and harmonics using the total frame energy and the LPC coefficients. Once the phase and amplitudes have been determined for the fundamental and harmonic frequencies, the synthesizer performs a sinusoidal analysis. In another embodiment, the remaining harmonic frequencies are determined by calculating the theoretical harmonic frequencies for the remaining harmonic frequencies and grouping these theoretical frequencies into groups having the same number as the number of offsets transmitted. The offsets are then added to the corresponding theoretical harmonics of each of the groups of the remaining harmonic frequencies to generate the remaining harmonic frequencies. In a third embodiment, the offset signals are randomly permuted before being added to the groups of theoretical frequencies to generate the remaining harmonic frequencies.
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"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.
Jacobs Thomas E.
Ketchum Richard H.
Kleijn Willem B.
American Telephone and Telegraph Company AT&T Bell Laboratories
Moran John C.
Shoop Jr. William M.
Young Brian
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