Patent
High speed cosine transform
TLDR
In this paper, a discrete transform cosine circuit utilizing symmetries of the cosine matrix of coefficients was proposed to allow all multiplications to be done by "constant multipliers" comprising combinations of look-up tables and adders.Abstract:
A discrete transform cosine circuit utilizing symmetries of the cosine matrix of coefficients to allow all multiplications to be done by "constant multipliers" comprising combinations of look-up tables and adders. Transform coefficients are developed by dividing each into a sequence of blocks of preselected size, the information in the blocks is sorted to develop a specific order and the reordered blocks are applied seriatim to a first one-dimensional cosine transform circuit employing the constant multipliers. The output of the first cosine transform circuit is applied to a transposing memory and then to a second cosine transform circuit that also employs "constant multipliers".read more
Citations
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Patent
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References
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Journal ArticleDOI
A Fast Computational Algorithm for the Discrete Cosine Transform
TL;DR: A Fast Discrete Cosine Transform algorithm has been developed which provides a factor of six improvement in computational complexity when compared to conventional DiscreteCosine Transform algorithms using the Fast Fourier Transform.
Patent
Discrete cosine transformer
TL;DR: In this article, an improved method and apparatus for calculating discrete cosine transform coefficients from a plurality of digitalized data is described, which utilizes two basic types of circuits arranged in five computational stages.
Patent
TV bandwidth reduction system using a hybrid discrete cosine DPCM
TL;DR: An image-compression system, wherein the image consists of a planar array of data points having various brightness levels, comprises a transmitter and a receiver, and circuitry is provided in a receiver for the modulating or decoding of the output signal of the transmitter.
Patent
Multiple point, discrete cosine processor
TL;DR: In this paper, a discrete cosine processor for video signals and the like is described, in which each term of a cosine transform matrix is approximated by a power of 2 terms so that all mathematical steps are performed by shifting and/or subtracting digital data.
Patent
Signal encoder using orthogonal transform
TL;DR: In this article, an encoder for subjecting an input signal to the orthogonal transform for band compression and encoding is presented, where the input signal is then effectively band compressed and encoded.