SEAMLESS VOIP SERVICE USING CENTRALIZED CODEC ADJUSTMENT: A FRAMEWORK IN WIRELESS NETWORK

2015 ◽  
Vol 77 (18) ◽  
Author(s):  
Rajina R. Mohamed ◽  
Wahidah Hashim ◽  
Marina Md. Din
Keyword(s):  
Network Traffic ◽  
Traffic Congestion ◽  
Voice Quality ◽  
Network Access ◽  
Traffic Conditions ◽  
Delay Sensitive ◽  
The Voice ◽  
Crucial Part ◽  
Seamless Service

The evolution of wireless technology leads VoIP application to be a good preferred choice among mobile users. Customers can having a VoIP service while being mobile regardless of location, terminal, and it is independent of network access. It is believed to be an alternative to the PSTN and its service is expected to be as good as PSTN. In essence, QoS plays a crucial part in order to maintain the seamless service during the VoIP session. As wireless networks are prone to channel error and VoIP application is known to be a delay-sensitive application, network traffic congestion could easily affect the voice quality of VoIP. Therefore, the codec selection within the VoIP application must be improved so that the codec can operate at various bit rates in order to cater for different traffic conditions. In this paper, we explain how centralize codec switching can help user to communicate seamlessly. We use WiFi network traffic as an example scenario. 

scholarly journals The voice quality of sports coaches

Logopedija ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Anđela Bučević ◽  
Ana Bonetti ◽  
Luka Bonetti
Keyword(s):  
Voice Quality ◽  
Training Session ◽  
Acoustic Method ◽  
Male And Female ◽  
Significant Difference ◽  
Before And After ◽  
Sports Coaches ◽  
The Voice ◽  
Female Coaches

The aim of this research paper was to examine the voice quality of sports coaches using the objective (acoustic) method. A total of 28 sports coaches (mean age 28.58, SD=5.08), from the City of Zagreb participated in this research. Recordings of the phonation of the vowel /a/ before and after one training session were obtained and analyzed using the PRAAT Program. Mean, minimal and maximal values of fundamental frequency, shimmer, jitter and harmonics-to-noise ratio were observed. The statistical analyses showed no statistically significant difference in acoustic voice quality of male and female coaches before and after the training session, or between male and female coaches. However, intra-individual differences among participants were observed, which may be significant in terms of their potential to affect the quality of their voices in the future.

scholarly journals A Decentralised Approach to Intersection Traffic Management

2018 ◽  
Author(s):  
Huan Vu ◽  
Samir Aknine ◽  
Sarvapali D. Ramchurn
Keyword(s):  
Quality Of Life ◽  
Waiting Time ◽  
Traffic Congestion ◽  
Traffic Management ◽  
State Of The Art ◽  
The State ◽  
Management Mechanism ◽  
Traffic Conditions

Traffic congestion has a significant impact on quality of life and the economy. This paper presents a decentralised traffic management mechanism for intersections using a distributed constraint optimisation approach (DCOP). Our solution outperforms the state of the art solution both for stable traffic conditions (about 60% reduced waiting time) and robustness to unpredictable events. 

A Design of Automatic Bus Station Reporter Based on VS1003 and SD Card

2013 ◽  
Vol 671-674 ◽  
pp. 2847-2850
Author(s):  
Xue Ming Deng ◽  
Qiao Wei Liu ◽  
Dong Song Yang ◽  
Yi Fei Zhang ◽  
Kan Jun Fu
Keyword(s):  
Voice Quality ◽  
Bus Station ◽  
Sd Card ◽  
The Voice

We aim to invent an automatic bus station reporter based on GPS module, VS1003 chip and SD card. Firstly, the VS1003 chip within the reporter can both decode and play the MP3 files, greatly improving the voice quality of the reporter itself. Secondly, the SD card with giant storage can store the information of bus stations and the accordingly voice files, making it free from the limit of capacity. Besides, with the change of SD cards, the reporter can adjust itself to different bus lines and gives different voice messages.

Impact of speech therapy on the improvement of voice quality in patients with unilateral vocal fold paralysis

2018 ◽  
Vol 7 (4) ◽  
pp. 1-7
Author(s):  
Anna Kuligowska ◽  
Barbara Jamróz ◽  
Joanna Chmielewska ◽  
Katarzyna Jędra ◽  
Tomasz Czernicki ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Speech Therapy ◽  
Acoustic Analysis ◽  
Vocal Tract ◽  
Voice Quality ◽  
Maximum Phonation Time ◽  
Before And After ◽  
Vocal Fold Palsy ◽  
The Voice

Aim of study: Evaluation of the speech therapy on voice quality in patients with unilateral vocal fold palsy. Material and methods: The study group included 11 patients, 8 women and 3 men, in age between 16 to 72 years, with unilateral vocal fold palsy, diagnosed in ENT Department of Warsaw Medical University between 2017-2018. Each person completed questionnaires: the voice disability self-assessment scale (VHI), the voice-based quality of life (VRQoL) scale, the vocal tract discomfort scale (VTD). All questionnaires were completed twice, before and after the voice therapy. In addition, the acoustic analysis of the voice, the assessment of the maximum phonation time and the breathing tract were performed twice in each patient. Each of the patients had a voice rehabilitation consisting of a series of 10 meetings. Results: Statistical analysis of the results of maximum phonation time, the self-assessment of voice disability, the quality of life depending on the voice, discomfort of the vocal tract voice acoustic analysis showed statistically significant differences in the results before and after rehabilitation (p <0.005). In addition, the improvement of the respiratory tract was observed in the majority of patients. Conclusions: Speech therapy significantly affects the voice quality of patients with unilateral laryngeal nerve palsy.

A New Computational Tool for Voice Analysis Based on FFT, Wavelet Transform, and Spectrogram

2009 ◽  
Author(s):  
Nathalee C. de Almeida ◽  
Jannayna D. Barros ◽  
Heliana B. Soares ◽  
Adriano de A. Bresolin ◽  
Ana Maria G. Guerreiro ◽  
...  
Keyword(s):  
Acoustic Analysis ◽  
Voice Quality ◽  
Digital Signal ◽  
Computational Tool ◽  
Voice Analysis ◽  
Non Invasive ◽  
Processing Techniques ◽  
The Voice ◽  
Signal Processing Techniques

Digital signal processing techniques have been used by acoustic analysis to evaluate the voice quality of the patient, due to the simplicity and non-invasive procedures for measurements.

The Dysphonia Severity Index

2000 ◽  
Vol 43 (3) ◽  
pp. 796-809 ◽  
Author(s):  
Floris L. Wuyts ◽  
Marc S. De Bodt ◽  
Geert Molenberghs ◽  
Marc Remacle ◽  
Louis Heylen ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Voice Quality ◽  
Severity Index ◽  
Voice Handicap Index ◽  
Objective Measures ◽  
Maximum Phonation Time ◽  
Vocal Quality ◽  
The Voice ◽  
Weighted Combination

The vocal quality of a patient is modeled by means of a Dysphonia Severity Index (DSI), which is designed to establish an objective and quantitative correlate of the perceived vocal quality. The DSI is based on the weighted combination of the following selected set of voice measurements: highest frequency (F 0 -High in Hz), lowest intensity (I-Low in dB), maximum phonation time (MPT in s), and jitter (%). The DSI is derived from a multivariate analysis of 387 subjects with the goal of describing, purely based on objective measures, the perceived voice quality. It is constructed as DSI=0.13 x MPT + 0.0053 x F 0 -High – 0.26 x I-Low – 1.18 x Jitter (%) + 12.4. The DSI for perceptually normal voices equals +5 and for severely dysphonic voices –5. The more negative the patient's index, the worse is his or her vocal quality. As such, the DSI is especially useful to evaluate therapeutic evolution of dysphonic patients. Additionally, there is a high correlation between the DSI and the Voice Handicap Index score.

EMG Biofeedback in the Treatment of Hyperfunctional Voice Disorders

1978 ◽  
Vol 43 (3) ◽  
pp. 282-294 ◽  
Author(s):  
Robert A. Prosek ◽  
Allen A. Montgomery ◽  
Brian E. Walden ◽  
Daniel M. Schwartz
Keyword(s):  
Voice Quality ◽  
Noise Generator ◽  
Emg Biofeedback ◽  
Biofeedback Training ◽  
Emg Activity ◽  
Voltage Controlled Oscillator ◽  
Emg Signal ◽  
Laryngeal Emg ◽  
The Voice

In this study, six patients who were judged to produce speech with excessive laryngeal tension participated in 14 30-min biofeedback training sessions. The EMG signal, measured by bipolar surface electrodes placed over the cricothyroid region, was amplified, integrated, and used to control the output of a voltage controlled oscillator (VCO) and a noise generator. A voltage comparator was used as a threshold device. Thus, the noise generator was activated when the EMG activity exceeded the value selected on the comparator, and the VCO was activated when the EMG signal was below threshold. The results demonstrated that three of the subjects reduced the laryngeal EMG activity used during speech production with a concomitant improvement in voice quality. The voice quality of the three remaining subjects was unchanged. Suggestions are made for modifying the equipment and procedures used in this study for routine clinical use of EMG biofeedback.

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