This paper describes two schemes for combining acoustic echo and noise reduction using a GSVD-based optimal filtering technique. The GSVD-based filtering technique is a signal enhancement technique which has recently been proposed for noise reduction in multi-microphone speech signals. In many speech communication applications however also a far-end echo source is present. Therefore a combined ...

Introduction A newly introduced compatible dual-echo arteriovenography (CODEA) is a technique for simultaneous acquisition of time-of-flight (TOF) MR angiogram (MRA) and blood oxygenation level-dependent (BOLD) MR venogram (MRV). The technique improved the previous dual-echo MRA/MRV technique (1), by maximally separating the K-space center regions for the two echoes achieved through an echo-spe...

Acoustic echo cancellers in today' s speakerphones or video conferencing systems rely on the assumption of a linear echo path. Low-cost audio equipment or constraints of portable communication systems cause nonlinear distortions, which limit the echo return loss enhancement achievable by linear adaptation schemes. These distortions are a superposition of different effects, which can be modelled...

A new post-processing method for acoustic echo canceler is proposed to reduce the residual echo and ambient noise. The method is based on the correlation of the desired signal and the estimation error signal of adaptive filter. The residual echoes are attenuated as proportional to the correlation of the desired signal and estimation error signal plays a role as Wiener filter for residual echo. ...

Abstract This paper presents a new dataset of measured multichannel room impulse responses (RIRs) named dEchorate. It includes annotations early echo timings and 3D positions microphones, real sources, image sources under different wall configurations in cuboid room. These data provide tool for benchmarking recent methods echo-aware speech enhancement, geometry estimation, RIR acoustic retrieva...

This study explores the geographic dependencies of echo-chamber communication on Twitter during the Brexit referendum campaign. We review the literature on filter bubbles, echo chambers, and polarization to test five hypotheses positing that echo-chamber communication is associated with homophily in the physical world, chiefly the geographic proximity between users advocating sides of the campa...

We simulate the effect of special excitation pulses on a cold gas of atoms. First, a rotary echo sequence is used to examine the coherent nature of a frozen Rydberg gas. If collective excitation and de-excitation is present with little or no source of dephasing, after these pulses the system should be returned to a state with few excitations, and a strong echo signal should occur. We investigat...