We proposed a speaking aid system using statistical voice conversion for laryngectomees, whose vocal folds have been removed. This paper investigates the influence of various small sound sources on the voice conversion accuracy. Spectral envelopes and power of sound sources are controlled independently. In total 8 different kinds of sound source signals, e.g. pulse train, sierra wave and so on,...

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...

WiMAX is a wireless broadband access technology which provides high data rates, long coverage and IP based connectivity to the stationary as well as mobile users. Voice over Internet Protocol (VoIP) through WiMAX is found to be very promising. In this paper, simulative investigations have been done to identify the suitable voice codec for the same. In doing so, silence suppressed voice signal a...

New refinement schemes for voice conversion are proposed in this paper. We take mel-frequency cepstral coefficients (MFCC) as the basic feature and adopt cepstral mean subtraction to compensate the channel effects. We propose S/U/V (Silence/Unvoiced/Voiced) decision rule such that two sets of codebooks are used to capture the difference between unvoiced and voiced segments of the source speaker...

We discuss techniques for Voice Activity Detection (VAD) for Voice over Internet Protocol (VoIP). VAD aids in reducing bandwidth requirement of a voice session thereby using bandwidth efficiently. Such a scheme would be implemented in the application Layer. Thus the VAD is independent of the lower layers in the network stack [3]. In this paper, we compare four time-domain VAD algorithms in term...

In this paper we present a new multiple access protocol based on DS-CDMA and slotted Aloha random access protocol with reservation for integrated voice and data transmission in packet personal communication networks (PCN). Speech activity detection is assumed for voice terminals who will relinquish their codes during their silence periods to be used by the data terminals. The code will be retur...

In this paper we develop a Markov chain modeling framework for throughput/delay analysis of data services over cellular voice networks, using dynamic channel stealing method. Some eeective approximation techniques are also proposed and veriied for simpliication of modeling analysis. Our study identiies the average voice call holding time as the dominant factor to aaect data delay performance. E...

Ovarian cancer is described as being a whisper because it is challenging to diagnose at an early stage. Women need the voice to respond to the whisperings and nurses need to listen and acknowledge these voices. The purpose of this descriptive qualitative study is to examine personal stories of ovarian cancer within the framework of Women's Ways of Knowing (WWK) to understand how women voice the...