This paper describes an acoustic-to-phonetic decoder (APD) (based on a mixed strategy: a) bottom-up which hypothesizes the most robust information about the speech signal, b) top-down which makes some verifications about the acoustic features or about the macro-class localization on the speech signal. In this paper, only the bottom-up strategy is described. In our system, a phoneme is described...

Orthogonal time frequency space (OTFS) is a novel two-dimensional (2D) modulation technique that provides reliable communications over time- and frequency-selective channels. In underwater acoustic (UWA) channel, the multi-path delay Doppler shift are several magnitudes larger than wireless radio communication, which will cause severe fading. The receiver has to recover distorted OTFS signal wi...

There is an increased risk for vocal and voice diseases due to the modern way of life. It is well known that most of the vocal and voice diseases cause changes in the acoustic voice signal. These diseases have to be diagnosed and treated during an early stage. Acoustic analysis is a non-invasive technique based on digital processing of speech signal. Acoustic analysis can be a useful tool to di...

Passive acoustic detection is being increasingly used to monitor visually cryptic cetaceans such as Blainville's beaked whales (Mesoplodon densirostris) that may be especially sensitive to underwater sound. The efficacy of passive acoustic detection is traditionally characterized by the probability of detecting the animal's sound emissions as a function of signal-to-noise ratio. The probability...

In an environment such as underwater channel where placing test equipments are difficult to handle, it is much practical to have hardware simulators to examine suitably designed transceivers (transmitter/receiver). The simulators of this kind will then allow researchers to observe their intentions and carry out repetitive tests to find suitable digital coding/decoding algorithms. In this p...

In recent years, need to increase the convenience of trips in railway vehicles causes that train operators and manufacturers focus on reducing the noise level which is sensed by passengers. In this paper, first the state of modeling acoustic noise in cab train is discussed and natural frequencies and acoustic mode shapes are derived and then formulation of acoustic pressure in the cab will be o...

in recent years, need to increase the convenience of trips in railway vehicles causes that train operators and manufacturers focus on reducing the noise level which is sensed by passengers. in this paper, first the state of modeling acoustic noise in cab train is discussed and natural frequencies and acoustic mode shapes are derived and then formulation of acoustic pressure in the cab will be o...

In this paper, an Adaptive Median Constant False Alarm Rate (AMCFAR) and multi−frame post detection integration algorithm is proposed for effective real time automatic target detection of boat−generated acoustic signals, in which, an observation space is created by sampling and dividing input analog acoustic signal into multiple frames and each frame is transformed into the frequency domain. In...