Hidden-Markov-model-based voice activity detector with high speech detection rate for speech enhancement


A new voice activity detection (VAD) algorithm with soft decision output in Mel-frequency domain is developed based on hidden Markov model (HMM) and is incorporated in an HMM-based speech enhancement system. The proposed VAD uses a two-state ergodic HMM representing speech presence and speech absence. The states are constructed from noisy speech and noise HMMs used in the speech enhancement system. This composite model provides a robust detection of speech segments in the presence of noise and obviates the need for extra modeling in HMM-based speech enhancement applications. As the main purpose of the proposed VAD is to detect speech segments accurately, a hang-over mechanism is proposed and is applied on the output of the VAD to improve the speech detection rate. The VAD is integrated in the HMM-based speech enhancement system in Mel-frequency spectral (MFS) and cepstral (MFC) domains. The performance of the proposed VAD, the effectiveness of the hang-over mechanism and the performance of the VAD-integrated speech enhancement system are evaluated on four noise types at different SNR levels. The experimental results confirm the superiority of the proposed VAD compared to the reference methods particularly for speech detection rate at the dominant noisy conditions.

Did you like this research project?

To get this research project Guidelines, Training and Code... Click Here

PROJECT TITLE : R3E Reliable Reactive Routing Enhancement for Wireless Sensor Networks - 2014 ABSTRACT: Providing reliable and efficient communication under fading channels is one of the major technical challenges in wireless
PROJECT TITLE : Network Resource Allocation for Users With Multiple Connections Fairness and Stability - 2014 ABSTRACT: This paper studies network resource allocation between users that manage multiple connections, possibly
PROJECT TITLE : Multi-Core Embedded Wireless Sensor Networks Architecture and Applications - 2014 ABSTRACT: Technological advancements in the silicon industry, as predicted by Moore's law, have enabled integration of billions
PROJECT TITLE : Joint Routing and Medium Access Control in Fixed Random Access Wireless Multihop Networks - 2014 ABSTRACT: We study cross-layer design in random-access-based fixed wireless multihop networks under a physical
PROJECT TITLE : Joint Interference Coordination and Load Balancing for OFDMA Multihop Cellular Networks - 2014 ABSTRACT: Multihop cellular networks (MCNs) have drawn tremendous attention due to its high throughput and extensive

Ready to Complete Your Academic MTech Project Work In Affordable Price ?

Project Enquiry