Dct,gibbs phen,oversampled adc,polyphase decomposition
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Dct,gibbs phen,oversampled adc,polyphase decomposition
- 1. TOPICS IN DSP ( Polyphase decomposition,DCT,Gibbs phenomenon,Oversampled ADC ) PRESENTED BY MUHAMMAD YOUNAS ROLL NO: SE-18 Department of Electrical Engineering PIEAS
- 4. Polyphase Representation for FIR and IIR Filters
- 5. Efficient Structure for Fractional Decimation. Fractional Decimator (Decimates by rational factor M/L) Polyphase Implementation of the fractional Decimator
- 14. Signal power component remains same from input to output
- 16. As the oversampling ratio M increases, Less of the quantization noise overlaps with the signal spectrum it is this effect of the oversampling that let us to improve the SNR .
- 28. Step 2:Transform • DC level shifting • 2D DCT -128 DCT
- 29. Step 2: Quantization Q-table Q the upper-left corner coefficient is called the DC coefficient , which is a measure of the average of the energy of the block Other coefficients are called AC coefficients , coefficients correspond to high frequencies tend to be zero or near zero for most natural images DC coefficient
- 32. Step 3: Zigzag Scanning Zigzag Scan (20,5,-3,-1,-2,-3,1,1,-1,-1, 0,0,1,2,3,-2,1,1,0,0,0,0,0, 0,1,1,0,1,EOB) Zigzag Scan End Of the Block: All following coefficients are zero which is followed by run length and Huffman encoding