Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Loudspeaker operation
Patent
1989-03-30
1991-04-02
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
Monitoring/measuring of audio devices
Loudspeaker operation
3645135, G10L 500
Patent
active
050052047
ABSTRACT:
This invention utilizes a time-varying recursive filter where the multipliers following successive delay elements of the filter have sets of normalized covariance matrix coefficients which are stored and which have been obtained from the normalized autocorrelation coefficients for each of a plurality of time frames of the sampled transient signal which is to be synthesized from the stored coefficients. The normalization constant during a frame is also applied as a scale factor to the recursive filter. The input of the filter is a pseudo-random noise generator signal applied to the recursive filter at the sample rate. A plurality of successive time frames of operation of the recursive filter and with a set of coefficients for each time frame provides the entire synthesized transient signal. An analog and digital implementation of the synthesizer are described.
REFERENCES:
patent: 3158685 (1964-11-01), Gerstman
patent: 4344148 (1982-08-01), Brantingham
Ozeki, Kazuhiko, "A Speech Analysis and Synthesis System by Linear Prediction for Pitch controlled Speech Compilation Experiments", NHK Laboratories Note, Ser. No. 209, Feb. 1977, pp. 1, 3-12.
Kemeny Emanuel S.
Maloney Denis G.
Raytheon Company
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