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WALSH TRANSFORM 1-D

Platform : DSP

IEEE Projects Years : 1998

This paper appears in: Image Processing, IEEE Transactions on Issue Date: Jun 1998 AIM : TO VERIFY THE WALSH TRANSFORM 1-D ABSTRACT The discrete Walsh and Hadamard transforms are often used in image processing tasks such as image coding, pattern recognition, and sequency filtering. A new discrete Walsh transform (DWT) algorithm is derived in which a modified form of the DWT relation is decomposed into smaller-sized transforms using vectorized quantities. A new sequency-ordered discrete Hadamard transform (DHAT) algorithm is also presented. The proposed approach results in more regular algorithms requiring no independent data swapping and fewer array-index updating and bit-reversal operations. An analysis of the computational complexity and the execution time performance are provided. The results are compared with those of the existing algorithms LEARNING OBJECTIVE : To understand about PWM modulator (214) for generating pulses at a width corresponding to the output of the DTMF SIGNAL, INPUT: DTMF coding. OUTPUT: Simulated version of DTMF GENERATOR DECODER. APPLICATIONS: Communication Engineering SOFTWARE USED : MATLAB 2007A

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