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A Review of an Digital Audio Watermarking using DCT Technique
https://www.ijert.org/research/a-review-of-an-digital-audio-watermarking-using-dct-technique-IJERTV3IS070507.pdf#:~:text=The%20technique%20is%20based%20on%20Discrete%20Cosine%20Transform,discrete%20sine%20transform%20%28DST%29%2C%20is%20equal%20to%20a
librosa.feature.inverse.mfcc_to_audio — librosa 0.9.0rc0 ...
https://librosa.org/doc/main/generated/librosa.feature.inverse.mfcc_to_audio.html
Discrete cosine transform (DCT) type By default, DCT type-2 is used. normNone or ‘ortho’. If dct_type is 2 or 3, setting norm='ortho' uses an orthonormal DCT basis. Normalization is not supported for dct_type=1. refnumber or callable. Reference power for (inverse) decibel calculation. lifternumber >= 0.
A Review of an Digital Audio Watermarking using DCT …
https://www.ijert.org/research/a-review-of-an-digital-audio-watermarking-using-dct-technique-IJERTV3IS070507.pdf
simply called “the DCT” its inverse type III DCT is called “the inverse DCT” or “IDCT”. Here are two transforms related are the discrete sine transform (DST), is equal to a DFT of real and odd functions, and the modified discrete transform (MDCT), and is based on DCT of overlapping data. [4] The audio signals high frequency DCT coefficients are
9.3 Discrete Cosine Transform and Inverse DCT - VLSI ...
https://www.oreilly.com/library/view/vlsi-digital-signal/9780471241867/sec-9.3.html
The DCT and inverse DCT (IDCT) algorithms are described by the following equations: DCT: and. IDCT: where. Notice that the DCT is an orthogonal transform, i.e., the transformation matrix for IDCT is a scaled version of the transpose of that for the DCT and vice versa. Therefore, the DCT architecture can be obtained by “transposing” the IDCT, i.e., reversing the direction of the …
Inverse discrete cosine transform - MATLAB idct
https://www.mathworks.com/help/signal/ref/idct.html
The inverse discrete cosine transform reconstructs a sequence from its discrete cosine transform (DCT) coefficients. The idct function is the inverse of the dct function. The DCT has four standard variants. For a transformed signal y of length N, and with δkℓ the Kronecker delta, the inverses are defined by:
librosa.feature.inverse — librosa 0.8.1 documentation
https://librosa.org/doc/main/_modules/librosa/feature/inverse.html
Audio Compression using DCT & CS - IJERT
https://www.ijert.org/research/audio-compression-using-dct-cs-IJERTV4IS010061.pdf
Audio compression using DCT and CS was designed and implemented. It was tested with different values. There are different applications such as Audio Conferencing, Broadcast Gateway, iTunes, Computers, Embedded Systems, and You Tube etc. This study represents a …
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