Monitoring jitter and packet loss in VoIP networks using speech quality features

2011 ◽  
Author(s):  
Carlos D. Nocito ◽  
Michael S. Scordilis
Keyword(s):  
Packet Loss ◽  
Speech Quality ◽  
Quality Features

scholarly journals Factors Affecting the Accessibility of Voice Telephony for People with Hearing Loss: Audio Encoding, Network Impairments, Video and Environmental Noise

2021 ◽  
Vol 14 (4) ◽  
pp. 1-35
Author(s):  
Linda Kozma-Spytek ◽  
Christian Vogler
Keyword(s):  
Hearing Loss ◽  
Speech Recognition ◽  
Packet Loss ◽  
Mental Effort ◽  
Quality Parameters ◽  
Speech Quality ◽  
Audio Quality ◽  
Presentation Modes ◽  
Quality Ratings ◽  
The Impact

This paper describes four studies with a total of 114 individuals with hearing loss and 12 hearing controls that investigate the impact of audio quality parameters on voice telecommunications. These studies were first informed by a survey of 439 individuals with hearing loss on their voice telecommunications experiences. While voice telephony was very important, with high usage of wireless mobile phones, respondents reported relatively low satisfaction with their hearing devices’ performance for telephone listening, noting that improved telephone audio quality was a significant need. The studies cover three categories of audio quality parameters: (1) narrowband (NB) versus wideband (WB) audio; (2) encoding audio at varying bit rates, from typical rates used in today's mobile networks to the highest quality supported by these audio codecs; and (3) absence of packet loss to worst-case packet loss in both mobile and VoIP networks. Additionally, NB versus WB audio was tested in auditory-only and audiovisual presentation modes and in quiet and noisy environments. With WB audio in a quiet environment, individuals with hearing loss exhibited better speech recognition, expended less perceived mental effort, and rated speech quality higher than with NB audio. WB audio provided a greater benefit when listening alone than when the visual channel also was available. The noisy environment significantly degraded performance for both presentation modes, but particularly for listening alone. Bit rate affected speech recognition for NB audio, and speech quality ratings for both NB and WB audio. Packet loss affected all of speech recognition, mental effort, and speech quality ratings. WB versus NB audio also affected hearing individuals, especially under packet loss. These results are discussed in terms of the practical steps they suggest for the implementation of telecommunications systems and related technical standards and policy considerations to improve the accessibility of voice telephony for people with hearing loss.

Speech quality estimation using packet loss effects in CELP-type speech coders

2007 ◽  
Author(s):  
Min-Ki Lee ◽  
Kyung-Tae Kim ◽  
Hong-Goo Kang ◽  
Dae Hee Youn
Keyword(s):  
Packet Loss ◽  
Speech Quality ◽  
Quality Estimation

Enhancement of Speech Quality in Telephony Communications by Steganography

2013 ◽  
pp. 164-181 ◽  
Author(s):  
Naofumi Aoki
Keyword(s):  
Signal Processing ◽  
Packet Loss ◽  
Side Information ◽  
Value Added ◽  
Speech Quality ◽  
Supplementary Data ◽  
Data Formats ◽  
Speech Data ◽  
Replacement Technique ◽  
Lsb Replacement

Steganography can transmit supplementary data without changing conventional data formats. The concept of high value-added communications is drawn from this advantage of steganography. As a specific application of the concept, this chapter describes two topics about the enhancement of the speech quality in telephony communications by steganography. A packet loss concealment technique and a band extension technique are explained. These techniques employ steganography for transmitting side information for improving the performance of signal processing. In addition, this chapter describes an efficient steganography technique devised for G.711, the most common codec for telephony speech standardized by ITU-T. The proposed technique, named selective LSB replacement technique, outperforms the conventional one in order to decrease the degradation caused by embedding side information into speech data by steganography.

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