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This work demonstrates the development of Keyword Spotting (KWS) system using Vowel Onset Point (VOP), Vector Quantization (VQ) and Hidden Markov Model(HMM) based techniques. The goal of KWS system is to spot the keywords present in the test speech signal, while neglecting rest of the words. In this work, first independent KWS systems will be developed using VOP, VQ and HMM techniques. Each of these methods involve different techniques and hence it may be possible to combine them for achieving higher performance. In the next step, KWS system is also developed by combining HMM and VQ (HMM-VQ) and also HMM and VOP (HMM-VOP) based KWS systems. The performance measured in terms of Figure Of Merit (FOM) for HMM, VQ and VOP are 53.32, 22.41 and 26.95, respectively. The FOM of combinations HMM-VQ and HMM-VOP are 57.18 and 60.62, respectively. The significantly improved performance in the combined systems demonstrate the complementary nature of keyword information exploited by each of the independent systems.