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In this paper, we propose a speech recognition engine using hybrid model of Hidden Markov Model (HMM) and Gaussian Mixture Model (GMM). Both the models have been trained independently and the respective likelihood values have been considered jointly and input to a decision logic which provides net likelihood as the output. This hybrid model has been(More)
Noise robustness is one of the most challenging problem in automatic speech recognition. The goal of robust feature extraction is to improve the performance of speech recognition in adverse conditions. The mel-scaled frequency cepstral coefficients (MFCCs) derived from Fourier transform and filter bank analysis are perhaps the most widely used front-ends in(More)
In this paper, a feature extraction method that is robust to additive background noise is proposed for automatic speech recognition. Since the background noise corrupts the autocorrelation coefficients of the speech signal mostly at the lower orders, while the higher-order autocorrelation coefficients are least affected, this method discards the lower order(More)
The major challenges faced by the researchers in speech synthesis are intelligibility and naturalness. Intelligibility means easily understandable and naturalness means the quality of speech being very near to human speech. Due to dynamic nature of human speech it is very difficult to mimic it, as the same content of speech in different situations is having(More)
This paper presents a new front-end for robust speech recognition. This new front-end scenario focuses on the spectral features of the filtered speech signals in the autocorrelation domain. The autocorrelation domain is well known for its pole preserving and noise separation properties. In this paper, a novel method for robust speech extraction is proposed(More)
This paper presents the performance analysis of Least Mean Square (LMS) algorithm for adaptive noise cancellation by varying its step size parameter μ for different filter order and no of iteration. The presented work has been simulated in MATLAB and verified that the step size parameter plays a vital role for implementation of Least Mean Square(More)
This paper presents the implementation of adaptive algorithms like Least Mean Square (LMS) and Normalized Least Mean Square (NLMS) in the frequency domain and their comparison to that implemented in the time domain. Adaptive filtering using adaptive algorithm in frequency domain can be done by taking Fourier Transform of input signal and independent weigh(More)
With the huge number of web pages that exist today, search engine plays an important role in the current Internet. But even if they allow finding relevant pages for any search topic, now a day the number of results returned is often too big those are very difficult to manage by the users. Moreover, the needs of the users vary, so that what may be important(More)
With the rapid growth in digital content and user's needs, the complexity of ranking mechanism utilized in digital libraries is increasing. Ranking plays a vital role in digital libraries to rank publications or scientific literature so that researchers can easily explore the search results list and find the desired content against the query. In this paper,(More)