Method and apparatus for processing digital audio signal

Details Method and apparatus for processing digital audio signal Method and apparatus for processing digital audio signal

2007-08-28

2007-08-28

Tran, Sinh (Department: 2615)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C381S098000

Reexamination Certificate

active

10427912

ABSTRACT:
A digital audio signal has a sequence of samples. Extreme values in an audio waveform represented by the digital audio signal are detected. The extreme values include a maximum value and a minimum value. An audio frequency represented by the digital audio signal is detected in response to the number of samples between two temporally-adjacent extreme-corresponding samples. A difference between each extreme value and a value of a sample which immediately precedes the present extreme-corresponding sample is calculated. The calculated differences are multiplied by selected one of predetermined coefficients to get corrective values respectively. A decision is made as to whether or not the detected audio frequency is in one selected from predetermined frequency bands. When the detected audio frequency is in the selected frequency band, a corresponding corrective value is added to the maximum value and a corresponding corrective value is subtracted from the minimum value.

REFERENCES:
patent: 6449519 (2002-09-01), Kuwaoka
patent: 11-126097 (1999-05-01), None

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