Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Loudspeaker operation
Patent
1989-01-26
1990-05-01
Harkcom, Gary V.
Electrical audio signal processing systems and devices
Monitoring/measuring of audio devices
Loudspeaker operation
381 41, 381 39, 381 30, G10L 902, G10L 904
Patent
active
049225391
ABSTRACT:
Method of encoding speech signals which is based upon determining the roots of the linear prediction polynomial describing the spectrum of an analog speech signal, wherein the roots are candidates in determining the formants of the speech signal. The method involves the analysis of respective frames of sampled digital speech data using a linear predictive technique to determine a set of reflection coefficients or K-parameters which are then converted into the equivalent predictor coefficients or A-parameters describing a prediction polynomial having a plurality of roots corresponding to the poles of an all-pole filter characterizing the vocal tract. A modified Bairstow technique is then empolyed for factoring out quadratic factors which are then sorted in an ordered arrangement in terms of ascending bandwidths. In performing the modified Bairstow technique, initial estimates of the successive quadratic factors for a current frame of digital speech data are made in sequence, and the prediction polynomial is successively deflated to a reduced order polynomial in determining the respective quadratic factors thereof. The initial estimate of the first quadratic factor is the same as the smallest bandwidth root as determined from the previous frame of digital speech data. These removed quadratic factors or roots are candidates for determining the formants of the speech signal.
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Doddington George R.
Rajasekaran Periagaram K.
Harkcom Gary V.
Hiller William E.
Knepper David D.
Merrett N. Rhys
Sharp Mel
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