Speech coder that determines pulsed parameters
First Claim
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1. A speech coder configured to analyze a digitized signal to determine model parameters for the digitized signal, the speech coder being operable to:
- receive a digitized signal;
divide the digitized signal into at least two frequency band signals;
perform an operation to emphasize pulse positions on at least two frequency band signals to produce modified frequency band signals;
determine pulsed parameters from the at least two modified frequency band signals.
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Abstract
Methods for estimating speech model parameters are disclosed. For pulsed parameter estimation, a speech signal is divided into multiple frequency bands or channels using bandpass filters. Channel processing reduces sensitivity to pole magnitudes and frequencies and reduces impulse response time duration to improve pulse location and strength estimation performance. These methods are useful for high quality speech coding and reproduction at various bit rates for applications such as satellite and cellular voice communication.
57 Citations
23 Claims
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1. A speech coder configured to analyze a digitized signal to determine model parameters for the digitized signal, the speech coder being operable to:
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receive a digitized signal; divide the digitized signal into at least two frequency band signals; perform an operation to emphasize pulse positions on at least two frequency band signals to produce modified frequency band signals; determine pulsed parameters from the at least two modified frequency band signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification