Speech Processing with the Usage of Cosine Transform
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Joined: Nov 2010
16-11-2010, 03:22 PM

This article describes methods of speech processing especially for cellular systems and internet voice communication.Oneof the most popular formats used for speech processing is PCM (Pulse Code Modulation) format, which has a high processing accuracy.However,long words and timeconsuming multiply operationsrestricts the usage of PCM codes.More advantageous to that,DPCM (Differential Pulse Code Modulation), which has a similar resolution as PCM but operates on shorter word lengths was developed DPCM uses delta modulation (DM) codes to obtain better or the same accuracy than PCM format.DPCM parameters include sampling rate and the step sizes of quantization.DPCM format operates for codes from a set of natural numbers.Examples include, in for 4-bit DPCM which includes 0.Modified DPCM (MDPCM) ,a modified version of DPCM uses quantization steps with the base 2 and natural exponents.Lack of all quantization steps,which is one of the important restrictions of MDPCM can be solved using parallel MDPCM coders ,which allow fast operations using all quantization steps within a set of the natural numbers.

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filesonicfile/32628823/Speech Processing with the Usage of Cosine Transform.pdf

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