Journal ArticleDOI
Multimicrophone signal‐processing technique to remove room reverberation from speech signals
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TLDR
A multimicrophone digital processing scheme for removing much of the degrading distortion in acoustic recordings produced in untreated rooms by dividing microphone signals into frequency bands whose corresponding outputs are cophased and added.Abstract:
It is well known that room reverberation can significantly impair one’s perception of sounds recorded by a microphone in that room. Acoustic recordings produced in untreated rooms are characterized by a hollow echolike quality resulting from not locating the microphone close to the source. In this paper we discuss a multimicrophone digital processing scheme for removing much of the degrading distortion. To accomplish this the individual microphone signals are divided into frequency bands whose corresponding outputs are cophased (delay differences are compensated) and added. Then the gain of each resulting band is set based on the cross correlation between corresponding microphone signals in that band. The reconstructed broadband speech is perceived with considerably reduced reverberation.read more
Citations
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Journal ArticleDOI
Image method for efficiently simulating small‐room acoustics
Jont B. Allen,David A. Berkley +1 more
TL;DR: The theoretical and practical use of image techniques for simulating the impulse response between two points in a small rectangular room, when convolved with any desired input signal, simulates room reverberation of the input signal.
Journal ArticleDOI
Signal estimation from modified short-time Fourier transform
D. Griffin,Jae Lim +1 more
TL;DR: An algorithm to estimate a signal from its modified short-time Fourier transform (STFT) by minimizing the mean squared error between the STFT of the estimated signal and the modified STFT magnitude is presented.
Journal ArticleDOI
A unified approach to short-time Fourier analysis and synthesis
TL;DR: The effects of modifications made to the short-time transform are explicitly shown on the resulting signal and it is shown that a formal duality exists between the two synthesis methods based on the properties of the window used for obtaining theshort-time Fourier transform.
Proceedings ArticleDOI
Signal estimation from modified short-time Fourier transform
D. Griffin,Jae Lim +1 more
TL;DR: An algorithm to estimate a signal from its modified short-time Fourier transform (STFT) by minimizing the mean squared error between the STFT of the estimated signal and the modified STFT magnitude is presented.
Book
Speech Dereverberation
TL;DR: Speech Dereverberation presents the most important current approaches to the problem of reverberation and defines the current state of the art and encourages further work on this topic by offering open research questions to exercise the curiosity of the reader.
References
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Journal ArticleDOI
A unified approach to short-time Fourier analysis and synthesis
TL;DR: The effects of modifications made to the short-time transform are explicitly shown on the resulting signal and it is shown that a formal duality exists between the two synthesis methods based on the properties of the window used for obtaining theshort-time Fourier transform.
Journal ArticleDOI
Short term spectral analysis, synthesis, and modification by discrete Fourier transform
TL;DR: In this article, a theory of short term spectral analysis, synthesis, and modification is presented with an attempt at pointing out certain practical and theoretical questions, which are useful in designing filter banks when the filter bank outputs are to be used for synthesis after multiplicative modifications are made to the spectrum.
Journal ArticleDOI
Reception of consonants in a classroom as affected by monaural and binaural listening, noise, reverberation, and hearing aids
Anna K. Nábělek,J. M. Pickett +1 more
TL;DR: Reception of consonants was studied with normal‐hearing subjects in a sound‐treated classroom to compare binaural and monaural reception, with and without hearing aids, in the presence of an impulsive noise and a quasisteady noise.
Journal ArticleDOI
Signal Processing to Reduce Multipath Distortion in Small Rooms
J. L. Flanagan,R. C. Lummis +1 more
TL;DR: In this article, a technique for combining the signals from two or more microphones to produce a single output having less multipath distortion than any of the individual microphone signals is described, where the output from each microphone is filtered to separate it into a number of bandpass signals occupying contiguous frequency bands.
Journal ArticleDOI
Determination of masking-level differences in a reverberant environment
TL;DR: A masking‐level difference paradigm was used to measure release from masking in a reverberant environment and results will be discussed in terms of a decorrelating effect produced by longterm reverberation.