Speech analyzer/synthesizer using recursive filters

Details Speech analyzer/synthesizer using recursive filters Speech analyzer/synthesizer using recursive filters

1975-11-14

1977-07-26

Claffy, Kathleen H.

G10L 100

Patent

active

040384950

ABSTRACT:
A speech analyzer and synthesizer features a digital adaptive linear predictor, using a recursive (rather than transversal) filter in a negative feedback loop which develops both feedforward and feedback filter coefficients. An input circuit is responsive to an input speech signal and to a first synthesized speech signal for developing an error signal. An output circuit is responsive to the error signal and to first state signals for developing multiplexed speech data signals. The multiplexed speech data signals are fed back, demultiplexed and applied to a first recursive filter to control the development of the first synthesized speech signal and the first state signals by the first recursive filter. The multiplexed speech data signals from the output circuit are also transmitted to a receiver which demultiplexes and applies the demultiplexed received speech data signals to a second recursive filter to control the development of a second synthesized speech signal by the second recursive filter. This second synthesized speech signal is then converted into an output speech signal which substantially sounds like the input speech signal.

REFERENCES:
patent: 3154738 (1964-10-01), Greene
patent: 3624302 (1971-11-01), Atal
patent: 3648171 (1972-03-01), Hirsh
patent: 3649765 (1972-03-01), Rabiner
patent: 3692939 (1972-09-01), Knight et al.
patent: 3740476 (1973-06-01), Atal
patent: 3890572 (1975-06-01), Desblanche
Atal and Schroeder, "Adaptive Prediction Coding of Speech Signals." Bell Sys. Tech. J., Oct. 1970, pp. 1973, 1982.
Kaiser, "The Digital Filter and Speech Communication" IEEE Trans. Audio and EA, June, 1968.
Flanagan, "Speech Analysis, Synthesis & Perception" 2nd Ed., Springer-Verlag, 1972, pp. 368, 400.
Itakura; Saito, "Digital Filtering Techniques for . . . " Seventh Int. Congress in Acoustics, Budapest, 1971.

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