To predict AAL2 multiplexing performance, we derived bandwidth gain analytically using discrete Markov chain model for voice service and validated these results with a simulation. And we also performed detailed simulation for voice and data services in a concentrator. Based on the analysis, we find that there is no major benefit of AAL2 multiplexing in a concentrator. The benefit of AAL2 multip...

In this paper, a novel entropy-based voice activity detection (VAD) algorithm is presented in variable-level noise environment. Since the frequency energy of different types of noise focuses on different frequency subband, the effect of corrupted noise on each frequency subband is different. It is found that the seriously obscured frequency subbands have little word signal information left, and...

Children’s ability to recognize their own recorded voice as their own was explored in a group of 4 to 5-year-old children. The task for the children was to identify which one of four voice samples represented their own voice. The results reveal that children perform well above chance level, and that a time span of 1-2 weeks between the recording and the identification does not affect the childr...

This research was conducted to develop a method to identify voice utterance. For voice utterance that encounters change caused by aging factor, with the interval of 10 to 25 years. The change of voice utterance influenced by aging factor might be extracted by MFCC (Mel Frequency Cepstrum Coefficient). However, the level of the compatibility of the feature may be dropped down to 55%. While the o...

backround laryngopharyngeal reflux (lpr) is the backflow of stomach contents above upper esophageal sphincter, into the pharynx, larynx, and upper aerodigestive system. objectives in this study, effects of omeprazole over voice quality in muscle tension dysphonia with laryngopharyngeal reflux was ınvestigated. patients and methods nine patients, 7 males and 2 females, aged between 27-43 (mean a...

We discuss techniques for Voice Activity Detection (VAD) for Voice over Internet Protocol (VoIP). VAD aids in saving bandwidth requirement of a voice session thereby increasing the bandwidth efficiently. In this paper, we compare the quality of speech, level of compression and computational complexity for three time-domain and three frequency-domain VAD algorithms. Implementation of time-domain...

Background: Hypoxia is an intensive environmental stressor which affects the psychophysiological state of an individual. It has been confirmed to influence the fundamental frequency of voice. This study aims to investigate the effect of different hypoxia conditions on formant characteristics of voice. Method: Eighteen volunteers recorded voice using a mobile phone in two phases. Study-1: Six su...

Anger detection is a topic that is gaining more and more attention with voice portal carriers, as it can be useful for quality measurement and emotion-aware dialog strategies. In the context of a prototype voice portal we describe methods to search for training data, report on the performance of the prosodic classifier under real world conditions and explore the use of dialog information for an...

The Filibuster text-to-speech system is specifically designed and developed for the production of digital talking textbooks at university level for students with print impairments. Currently, the system has one Swedish voice, 'Folke', which has been used in production at the Swedish Library of Talking Books and Braille (TPB) since 2007. In August 2008 the development of a Norwegian voice (bokmå...

Anger detection is a topic that is gaining more and more attention with voice portal carriers, as it can be useful for quality measurement and emotion-aware dialog strategies. In the context of a prototype voice portal we describe methods to search for training data, report on the performance of the prosodic classifier under real world conditions and explore the use of dialog information for an...