US 7,024,260 B2Granted

Method and apparatus for processing digital audio signal

AssigneeVictor Company of Japan, Ltd.

InventorToshiharu Kuwaoka

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Abstract

Maximal and minimal values represented by samples of a digital audio signal are detected. A number of samples from a sample representing a minimal value to a maximal-value-corresponding sample is detected. A number of samples from a sample representing a maximal value to a minimal-value-corresponding sample is detected. Calculation is given of a first difference between the maximal-value-corresponding sample and the immediately-preceding sample. Calculation is given of a second difference between the minimal-value-corresponding sample and the immediately-preceding sample. First and second coefficients are calculated from the detected sample numbers. The first coefficient and the first difference are multiplied to generate a first multiplication result. The second coefficient and the second difference are multiplied to generate a second multiplication result. The maximal value represented by the maximal-value-corresponding sample is incremented by the first multiplication result. The minimal value represented by the minimal-value-corresponding sample is decremented by the second multiplication result.

Claims9

Dependent claims

An apparatus for processing a digital audio signal having a sequence of samples, the apparatus comprising:

first means for detecting maximal values and minimal values represented by samples of the digital audio signal;
second means for detecting a number of samples from a sample representing a minimal value detected by the first means to a maximal-value-corresponding sample representing a maximal value detected by the first means;
third means for detecting a number of samples from a sample representing a maximal value detected by the first means to a minimal-value-corresponding sample representing a minimal value detected by the first means;
fourth means for calculating a first difference between the maximal value represented by the maximal-value-corresponding sample and a value represented by a sample immediately preceding the maximal-value-corresponding sample;
fifth means for calculating a second difference between the minimal value represented by the minimal-value-corresponding sample and a value represented by a sample immediately preceding the minimal-value-corresponding sample;
sixth means for calculating a first coefficient from the sample number detected by the second means;
seventh means for calculating a second coefficient from the sample number detected by the third means;
eighth means for multiplying the first coefficient and the first difference to generate a first multiplication result;
ninth means for multiplying the second coefficient and the second difference to generate a second multiplication result;
tenth means for incrementing the maximal value, represented by the maximal-value-corresponding sample, by the first multiplication result to modify the maximal-value-corresponding sample;
and
eleventh means for decrementing the minimal value, represented by the minimal-value-corresponding sample, by the second multiplication result to modify the minimal-value corresponding sample.

9 more elements

A computer readable medium storing a computer program for processing a digital audio signal having a sequence of samples, the computer program comprising the steps of:

(1) detecting maximal values and minimal values represented by samples of the digital audio signal;
(2) detecting a number of samples from a sample representing a minimal value detected by the step (1) to a maximal-value-corresponding sample representing a maximal value detected by the step (1);
(3) detecting a number of samples from a sample representing a maximal value detected by the step (1) to a minimal-value-corresponding sample representing a minimal value detected by the step (1);
(4) calculating a first difference between the maximal value represented by the maximal-value-corresponding sample and a value represented by a sample immediately preceding the maximal-value-corresponding sample;
(5) calculating a second difference between the minimal value represented by the minimal-value-corresponding sample and a value represented by a sample immediately preceding the minimal-value-corresponding sample;
(6) calculating a first coefficient from the sample number detected by the step (2);
(7) calculating a second coefficient from the sample number detected by the step (3);
(8) multiplying the first coefficient and the first difference to generate a first multiplication result;
(9) multiplying the second coefficient and the second difference to generate a second multiplication result;
(10) incrementing the maximal value, represented by the maximal-value-corresponding sample, by the first multiplication result to modify the maximal-value-corresponding sample;
and
(11) decrementing the minimal value, represented by the minimal-value-corresponding sample, by the second multiplication result to modify the minimal-value-corresponding sample.

9 more elements

A method of processing a digital audio signal having a sequence of samples, the method comprising the steps of:

(1) detecting maximal values and minimal values represented by samples of the digital audio signal;
(2) detecting a number of samples from a sample representing a minimal value detected by the step (1) to a maximal-value-corresponding sample representing a maximal value detected by the step (1);
(3) detecting a number of samples from a sample representing a maximal value detected by the step (1) to a minimal-value-corresponding sample representing a minimal value detected by the step (1);
(4) calculating a first difference between the maximal value represented by the maximal-value-corresponding sample and a value represented by a sample immediately preceding the maximal-value-corresponding sample;
(5) calculating a second difference between the minimal value represented by the minimal-value-corresponding sample and a value represented by a sample immediately preceding the minimal-value-corresponding sample;
(6) calculating a first coefficient from the sample number detected by the step (2);
(7) calculating a second coefficient from the sample number detected by the step (3);
(8) multiplying the first coefficient and the first difference to generate a first multiplication result;
(9) multiplying the second coefficient and the second difference to generate a second multiplication result;
(10) incrementing the maximal value, represented by the maximal-value-corresponding sample, by the first multiplication result to modify the maximal-value-corresponding sample;
and
(11) decrementing the minimal value, represented by the minimal-value-corresponding sample, by the second multiplication result to modify the minimal-value-corresponding sample.

9 more elements

Dependencies are inferred from the claim text.