This paper investigates the simulation of reverberation in a small room using image source method, Schroeder model, and Gardner model. It then compares the simulation results with measurement of reverberation in the real measurement room. It shows a large difference between the simulation and the real measurement of reverberation due to the over-simplified representation of the sound source, re...

OBJECTIVE The purpose of this study is to assess the individual effect of reverberation and noise, as well as their combined effect, on speech intelligibility by cochlear implant (CI) users. DESIGN Sentence stimuli corrupted by reverberation, noise, and reverberation + noise are presented to 11 CI listeners for word identification. They are tested in two reverberation conditions (T60 = 0.6 s,...

Signal processing techniques allow us not only to compensate for the acoustics of a listening environment, but also to add special musical effects such as delay, echo, and reverb, if desired. The most common example is the audio equalizer that allows us to enhance the bass or treble content of an audio signal. What a listener hears in a room depends not only on the acoustics characteristics of ...

Direction of Arrival (DOA) estimation is an important technique for speech perception and speaker localization, which has received much attention in recent years. However, most conventional methods concentrate on noisy environments, which leads to serious degradation of their performance in the presence of reverberation. To resolve this phenomenon, a novel approach based on reverberation weight...

Antennas have traditionally been measured in anechoic chambers. An anechoic chamber is a suitable and necessary reference environment to measure large antennas that are used in a Line-Of-Sight (LOS) environment, but it is an unsuitable environment to measure devices with small antennas. Devices with small antennas are normally used in a Non-LOS environment, which is typically characterised by a...

In this paper we present a dereverberation algorithm for improving automatic speech recognition (ASR) results with minimal CPU overhead. As the reverberation tail hurts ASR the most, late reverberation is reduced via gain-based spectral subtraction. We use a multi-band decay model with an efficient method to update it in realtime. In reverberant environments the multi-channel version of the pro...

For brain functions such as working memory and motor planning, neuronal circuits are able to sustain persistent activity after transient inputs. Theoretical studies have suggested that persistent activity can exist in recurrently connected networks as active reverberation. However, the actual cellular processes underlying such reverberation are not well understood. In this study, we investigate...

A simple but efficient stereo reverberation control is developed to simulate reverberation. Inspired from previous classic studies, the reverberator is built using simple digital filters, including comb filters and all-pass filters commonly used for digitally simulating reverberation. The digital reverberator incorporates low-pass filters to simulate the air and walls absorption effect, gains t...

Source localization using microphone arrays has for some time been an active and challenging research area. The main obstacle in designing robust practical systems is the e ects of room reverberation. This paper, along with a companion, analyzes the in uence of reverberation. In this paper, a new statistical model is developed that explains the e ects of reverberation. The model is based on the...

Monaural speech separation in reverberant conditions is very challenging. In masking-based separation, features extracted from speech mixtures are employed to predict a time-frequency mask. Robust feature extraction is crucial for the performance of supervised speech separation in adverse acoustic environments. Using objective speech intelligibility as the metric, we investigate a wide variety ...