We consider a class of underwater acoustic communication channels where each propagation path can be characterized by a complex-valued Gaussian fading process. The capacity of such channels is computed and analyzed using three power allocation strategies: water-filling, uniform, and on-off uniform power allocation across the signal bandwidth. Our analysis considers the effects of imperfect chan...

A new approach for acoustic feedback cancellation is presented. The challenge in acoustic feedback cancellation is a strong correlation between the local speech and the loudspeaker signal. Due to this correlation, the convergence rate of adaptive algorithms is limited. Therefore, a novel stepsize control of the adaptive filter is presented. The stepsize control exploits reverberant signal perio...

Abstract Many speech processing systems struggle in conditions with low signal-to-noise ratios and changing acoustic environments. Adaptation at the transduction level integrated signal could help to address this; human hearing, are can be adaptively tuned for noisy conditions. Here we report a microelectromechanical cochlea as bio-inspired sensor functionality. Real-time feedback is used tune ...

Abstract When designing closed-loop electro-acoustic systems, which can commonly be found in hearing aids or public address the most challenging task is canceling and/or suppressing feedback caused by acoustic coupling of transducers such systems. In many applications, cancelation based on adaptive filters used for this purpose. However, due to computational complexity a canceler often limited ...

With the increasing popularity of touch screen mobile devices, improving the usability and the user experience while inputting text on these devices is becoming increasingly important. Most conventional touch screen keyboards on mobile devices rely heavily on visual feedback, while auditory feedback seldom includes any useful information about what is being inputted by the user. The auditory fe...

Acoustic black holes (ABHs) are tapered structural features that can achieve high levels of damping within lightweight constraints. It has previously been proposed to integrate feedforward active vibration control into an ABH enable over a broad spectrum, however, the time-advanced information required in this strategy is not always available. In addition, it shown controlling reflection coeffi...

Hearing one's own speech is important for language learning and maintenance of accurate articulation. For example, people with postlinguistically acquired deafness often show a gradual deterioration of many aspects of speech production. In this manuscript, data are presented that address the role played by acoustic feedback in the control of voice fundamental frequency (F0). Eighteen subjects p...

corrective feedback (cf) and its different types have long absorbed many scholars and practitioners. as ellis (2009) mentioned some experimental studies need to be carefully designed to discover the relative effectiveness of each of these cf techniques. the goal of this qualitative study was to discover whether the employment of different cf strategies could bring about an attitudinal shift. to...