Perceptual evaluation of speech quality (PESQ)-a new method for speech quality assessment of telephone networks and codecs
…, MP Hollier, AP Hekstra - 2001 IEEE international …, 2001 - ieeexplore.ieee.org
Previous objective speech quality assessment models, such as bark spectral distortion (BSD),
the perceptual speech quality measure (PSQM), and measuring normalizing blocks (MNB)…
the perceptual speech quality measure (PSQM), and measuring normalizing blocks (MNB)…
An alternative to metric rescaling in Viterbi decoders
AP Hekstra - IEEE Transactions on Communications, 1989 - ieeexplore.ieee.org
In the Viterbi algorithm, the negative log-likelihood estimates, accumulated distances, or
path metrics are unboundedly increasing functions of time. For implementation, all variables …
path metrics are unboundedly increasing functions of time. For implementation, all variables …
Dependence balance bounds for single-output two-way channels
AP Hekstra, FMJ Willems - IEEE Transactions on Information …, 1989 - ieeexplore.ieee.org
If in a transmission the inputs of a single-output two-way channel exhibit some interdependence,
this dependence must have been created during earlier transmissions. The idea that no …
this dependence must have been created during earlier transmissions. The idea that no …
Perceptual evaluation of speech quality (pesq) the new itu standard for end-to-end speech quality assessment part ii: psychoacoustic model
JG Beerends, AP Hekstra, AW Rix, MP Hollier - Journal of the Audio …, 2002 - aes.org
With the introduction and standardization of new technologies for telephony services, which
introduce new types of distortions such as voice-over IP (packet loss and variable delay), …
introduce new types of distortions such as voice-over IP (packet loss and variable delay), …
Perceptual Evaluation of Speech Quality (PESQ) The New ITU Standard for End-to-End Speech Quality Assessment Part I--Time-Delay Compensation
AW Rix, MP Hollier, AP Hekstra, JG Beerends - Journal of the Audio …, 2002 - aes.org
… At Psytechnics he has led the company through formation, initial expansion and market
development, launching a Andries P. Hekstra was born in Breda, The Netherlands, in 1961. He …
development, launching a Andries P. Hekstra was born in Breda, The Netherlands, in 1961. He …
PVQM–A perceptual video quality measure
AP Hekstra, JG Beerends, D Ledermann… - Signal processing …, 2002 - Elsevier
Modern video coding systems such as ISO-MPEG1,2,4 exploit properties of the human visual
system, to reduce the bit rate at which a video sequence is coded, given a certain required …
system, to reduce the bit rate at which a video sequence is coded, given a certain required …
Video quality experts group: Current results and future directions
…, T Hamada, D Harrison, AP Hekstra… - Visual …, 2000 - spiedigitallibrary.org
The Video Quality Experts Group (VQEG) was formed in October 1997 to address video
quality issues. The group is composed of experts from various backgrounds and affiliations, …
quality issues. The group is composed of experts from various backgrounds and affiliations, …
PESQ-the new ITU standard for end-to-end speech quality assessment
AW Rix, MP Hollier, JG Beerends, AP Hekstra - Audio Engineering Society …, 2000 - aes.org
This paper describes a new model for perceptual evaluation of speech quality (PESQ). This
model is based on an integration of the perceptual speech quality measure (PSQM99) and …
model is based on an integration of the perceptual speech quality measure (PSQM99) and …
Two-dimensional optical storage
…, AM van der Lee, AP Hekstra… - … .(ICASSP'05). IEEE …, 2005 - ieeexplore.ieee.org
With storage capacities increasing much faster than data rates, fast read-out of content is
becoming a bottleneck for the convenient use of optical storage devices. Two-dimensional …
becoming a bottleneck for the convenient use of optical storage devices. Two-dimensional …
Signal processing and coding for two-dimensional optical storage
…, AM van der Lee, C Busch, AP Hekstra… - … '03. IEEE Global …, 2003 - ieeexplore.ieee.org
The paper introduces the concept of two-dimensional optical storage (TwoDOS). In this concept,
bits are written in a broad spiral consisting of a number of bit-rows stacked together in a …
bits are written in a broad spiral consisting of a number of bit-rows stacked together in a …