Selection of coding parameters based on spectral content of a speech signal
First Claim
Patent Images
1. A method of coding a speech signal, the method comprising the steps of:
- accumulating samples of the speech signal over a sampling duration to provide accumulated samples;
evaluating the accumulated samples to obtain a representative sample;
determining whether a slope of the representative sample conforms to a defined characteristic slope stored in a reference database of spectral characteristics; and
selecting a value of a coding parameter, for coding the speech signal, based on the determining step;
wherein the selecting step selects a first coding parameter value as the value if the determining step determines that the slope of the representative sample of the speech signal conforms to the defined characteristic slope, and wherein the selecting step selects a second coding parameter value as the value if the determining step determines that the slope of the representative sample of the speech signal is generally flat.
8 Assignments
0 Petitions
Accused Products
Abstract
In a coding procedure, coding parameters are selected for coding the speech signal to achieve enhanced perceptual quality of reproduced speech. At least one coding parameter value or preferential coding parameter value is selected to make a spectral response of the speech signal more uniform to compensate for spectral variations that might otherwise be imparted into the speech signal by a communications network associated with the signal processing system.
57 Citations
27 Claims
-
1. A method of coding a speech signal, the method comprising the steps of:
-
accumulating samples of the speech signal over a sampling duration to provide accumulated samples;
evaluating the accumulated samples to obtain a representative sample;
determining whether a slope of the representative sample conforms to a defined characteristic slope stored in a reference database of spectral characteristics; and
selecting a value of a coding parameter, for coding the speech signal, based on the determining step;
wherein the selecting step selects a first coding parameter value as the value if the determining step determines that the slope of the representative sample of the speech signal conforms to the defined characteristic slope, and wherein the selecting step selects a second coding parameter value as the value if the determining step determines that the slope of the representative sample of the speech signal is generally flat. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A system for coding a speech signal, the system comprising:
-
a buffer memory for accumulating samples of the speech signal over a sampling duration to provide accumulated samples;
an evaluator adapted to evaluate the accumulated samples to obtain a representative sample and to make a determination whether a slope of the representative sample of the speech signal conforms to a defined characteristic slope stored in the storage device; and
a selector for selecting a preferential one of a first coding parameter value and a second coding parameter value for coding the speech signal based on the determination;
wherein the selector selects a first coding parameter value as the value if the evaluator determines that the slope of the representative sample of the speech signal conforms to the defined characteristic slope, and wherein the selector selects a first coding parameter value as the value if the evaluator determines that the slope of the representative sample of the speech signal is generally flat. - View Dependent Claims (23, 24, 25, 26, 27)
-
Specification