Digital filter for sub-band synthesis

Details Digital filter for sub-band synthesis Digital filter for sub-band synthesis

2005-07-12

2005-07-12

Abebe, Daniel (Department: 2655)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S500000

Reexamination Certificate

active

06917913

ABSTRACT:
In a MPEG audio decoding process, an IDCT (Inverse Discrete Cosine Transform) process that generates time domain samples from frequency domain samples using a very limited number of prestored cosine coefficients is performed. Only the cosine coefficients that satisfy cos(π*(i/64)) where i=0-32 are prestored. The cosine coefficients for i=33-63 are calculated using the prestored coefficients by changing a sign of a corresponding symmetrical one of the stored coefficients, respectively. Then, sixty-four time domain samples (Vi) are generated from thirty-two frequency domain samples (Sk) according to the equationVi=∑k=031⁢cos⁢((π/64)⁢(i+16)⁢(2⁢k+1))×Skwhere i=0 to 63, using only the prestored cosine coefficients and the calculated cosine coefficients.

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Konstantinos Konstantinides, Fast Subband Filtering in MPEG Audio Coding, IEEE Signal Processing Lettters, vol. 1, No. 2., Feb. 1994, pp. 26-28 (1970-990894).
Myung Jun Kim, et al. An Efficient Video Down Conversion Algorithm Using Modified IDCT Basis Funcitions, IEEE 0-7803- 5467-Feb. 1999, pp. 914-918.
Vladimir Britanak, et al. An Efficient Implementation of the Forward and Inverse MDCT in MPEG Audio Coding, IEEE Signal Processing Letters, vol. 8, No. 2. Feb. 2001 (1070-9908/01).

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