Error vector used in vector quantization

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Ayesha 2014-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/140824-error-vector-used-in-vector-quantization

Hello,

I was going through existing vector quantization algorithms and I stumbled upon Kekre's Error Vector Rotation algorithm. I have a question regarding 'error vector' which is added and subtracted from the codeword. What is the wisdom behind the use of 'error vector'?

Thank you