In Stereophonic Acoustic Echo Cancellation (SAEC), one of the fundamental problems lies in the misalignment in the lter coe cients due to the two strongly correlated channel-inputs. In this paper, we study the e ect of the normalisation factor, , upon the convergence properties of the two-channel Normalised Least Mean Square ( -NLMS) algorithm, through analysis and simulation studies with real ...

Wave field synthesis (WFS) and higher-order Ambisonics (HOA) are two high-resolution spatial sound reproduction techniques aiming at overcoming some of the limitations of stereophonic reproduction techniques. In the past, the theoretical foundations of WFS and HOA have been formulated in a quite different fashion. Although, some work has been published that aims at comparing both approaches the...

In this paper, we present a novel adaptive filtering scheme for Stereophonic Acoustic Echo Cancellation (SAEC). The proposed scheme is based on the adaptive parallel subgradient projection techniques (Yamada et. al., 2002) combined with the input sliding technique (Joncour and Sugiyama, 1998, Sugiyama, Joncour, Hirano, 2001). The scheme uses information both in the current and previous periods ...

Technology used in Digital TV has the potential to enhance the viewing experience for millions of hard of hearing people. The Clean Audio project commissioned by the Independent Television Commission (ITC), and continued by Ofcom, looks at methods by which the extra information contained in 5.1 surround sound broadcasts may be used to improve the intelligibility and enjoyment of television audi...

This study investigates how students develop their understanding of chemical representations with the aid of a visualizing tool, eChem, that allows them to build molecular models and view multiple representations simultaneously. Multiple sources of data were collected with the participation of 71 eleventh graders in a high school over a six-week period. The results of the preand post-tests show...

Digital audio is becoming increasingly popular in higher education with faculty digitally recording and broadcasting lectures for students to learn-on-demand. Students have discovered accelerated playback features in popular computer software and use it to reduce the amount of time spent listening to audio-enhanced instruction. In the current study, 183 undergraduates were randomly assigned to ...

We report research that was initially a response to our observations of the difficulties that threeand four-year-old children in Scottish preschool settings may experience during free play at the computer. In conjunction with preschool educators, we observed and made video recordings of children’s encounters with more varied forms of technology. We identified ways in which educators could suppo...