Backscattering from the rough water-bottom interface can serve as a surrogate probe source in time reversal. A time-gated portion of the reverberation then is refocused to the bottom interface at the corresponding range @Lingevitch et al., J. Acoust. Soc. Am. 111, 2609–2614 ~2002!#. In this paper, reverberation nulling is investigated to enhance active target detection without a priori knowledg...

This paper further investigates previous findings that coefficients of acoustic responses can be modelled as random polynomials with certain constraints applied. In the case of room impulse responses, the median value of their clustered roots has been shown to be directly related to the reverberation time of the room. In this paper we examine the frequency dependency of reverberation time and w...

It has been known that noise and reverberation greatly affect the perception of linguistic information, in particular speech intelligibility. However, effect on non-linguistic information not clarified. We investigated how these types disturbances (speaker individuality vocal emotion) noise-vocoded speech. conducted speaker-distinction vocal-emotion-recognition experiments using created from no...

Reverberation-robust speech recognition has become very important in the recognition of distant-talking speech. However, as no common reverberation criteria for the recognition of reverberantspeech have been proposed, it has been difficult to estimate this. We have thus focused on a reverberation criterion for the recognition of distant-talking speech. The reverberation time is generally curren...

Sound propagation encompasses various acoustic phenomena including reverberation. Current virtual acoustic methods ranging from parametric filters to physically accurate solvers can simulate reverberation with varying degrees of fidelity. The effects of reverberant sounds generated using different propagation algorithms on acoustic distance perception are investigated. In particular, two classe...

Evaluate the relative importance of various types of seafloor variability on the predictability of the temporal evolution of acoustic transmissions and reverberation in shallow water waveguides. The measures of uncertainty include the predictability of the levels of the transmissions/reverberation, the decay rates, and the coherent features of the time-depth evolution of the receptions. Seafloo...

We conducted synthetic experiments to evaluate the effects of shallow-layer reverberation in oceanic regions on P-wave travel times measured by waveform cross-correlation. Time shift due to waveform distortion by the reverberation was estimated as a function of period. Reverberations in the crystalline crust advance the P-waves by a frequency-independent time shift of about 0.3 s in oceans. Sed...

An impulse response of an enclosed reverberant space is composed of three basic components: the direct sound, early reflections and late reverberation. While the direct sound is a single event that can be easily identified, the division between the early reflections and late reverberation is less obvious as there is a gradual transition between the two. This paper explores two statistical measu...