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Dynamic Range Compression Characteristics Using an Interpolating Polynomial for Digital Audio Systems
Shugang WEI Kensuke SHIMIZU
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/02/01
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Digital Signal Processing
dynamic range control, compression characteristic, interpolating polynomial, digital audio system, gain,
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An audio signal level compressor is presented, which is based on the approximation algorithm using an interpolating polynomial. To implement a compression characteristic in a digital audio system, a power calculation with fractional numbers is required and it is difficult to be performed directly in digital circuits. We introduce a polynomial expression to approximate the power operation, then the gain calculation is easily performed with a number of additions, multiplications and a division. Newton's interpolation formula is used to calculate the compression characteristics in a very short time and the obtained compression characteristics are very close to the ideal ones.