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US 2013/0254249 A1Published application
Apparatus and method for low complexity combinatorial coding of signals
AssigneeMotorola Mobility LLC
InventorsUdar Mittal, James P. Ashley, Edgardo M. Cruz-Zeno
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Abstract
The invention utilizes low complexity estimates of complex functions to perform combinatorial coding of signal vectors. The invention disregards the accuracy of such functions as long as certain sufficient properties are maintained. The invention in turn may reduce computational complexity of certain coding and decoding operations by two orders of magnitude or more for a given signal vector input.
Claims13
A method for combinatorial coding and decoding, the method comprising the steps of:
- receiving a vector comprising speech, audio, image, or video;
- receiving a value n based on a number of positions in the vector;
- receiving a value d based on a number of occupied positions within the vector;
- generating a value F′(n, d) based on a logarithmic approximation of the combinatorial function of F(n,d) and comprising generating a logarithmic approximation of a numerator of F(n,d) and generating a logarithmic approximation of a denominator by subtracting a combinatorial function Q′(d) from the numerator;
- and
- using the value F′(n, d) to code or decode the vector to produce coded or decoded speech, audio, image, or video.
3 more elements
An apparatus comprising:
- a vector generator receiving a vector comprising speech, audio, image, or video;
- a combinatorial function generator receiving a value n based on a number of positions in the vector, receiving a value d based on a number of occupied positions within the vector, and generating a value F′(n, d) based on a logarithmic approximation of the combinatorial function of F(n,d) and comprising generating a logarithmic approximation of a numerator of F(n,d) and generating a logarithmic approximation of a denominator by subtracting a combinatorial function Q′ (d) from the numerator;
- and
- a coder/decoder using the value F′(n, d) to code or decode the vector to produce coded or decoded speech, audio, image, or video.
1 more element
Dependencies are inferred from the claim text.