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, the acoustic-phonetic characteristics of steady apical trills--trill sounds produced by the periodic vibration of the apex of the tongue--are studied. Signal processing methods, namely, zero-frequency filtering and zero-time liftering of speech signals, are used to analyze the excitation source and the resonance characteristics of the vocal tract system, respectively. Although it...

ABSTRACT- Firmness is one of the most important quality indicators for apple fruits, which is highly correlated with the storage time. The acoustic impulse response technique is one of the most commonly used nondestructive detection methods for evaluating apple firmness. This paper presents a non-destructive method for classification of Iranian apple (Malus domestica Borkh. cv. Golab) according...

Acoustic emission (AE) is one of the most recent entries into the field of nondestructive evaluation. Due to the uniqueness of the basic principle and the potential for tackling a wide range of applications, the technique has gone through rapid strides in a very short time. Thus, today, two decades after the first application of the technique, AE is used in various industries, such as petro-che...

This work investigated the relationship between acoustic parameters and phonetic features for six Mandarin affricates. The acoustic parameters under study included normalized duration, normalized amplitude, spectral energy distribution, and F2 onset of the following vowel, while the phonetic features under study included place of articulation, state of aspiration, and identity of the following ...

This report describes an acoustic analysis of the speech of persons with dysarthria. Sentence-based vs. word-based syllable rate and examples of deviant articulation patterns are presented. Implications for speech recognition systems are discussed.

Trying to predict the wear of a tool from the sound it makes, has a long history. People have always been interested in real-time monitoring of machinery to detect faults as and when they occur, rather than wait until the next maintenance period. This way, unnecessary maintenance, as well as long runs in a faulty condition, can be avoided. In the case of a cutting tool, trying to cut with a blu...

Music can be enjoyed on different time scales, going from the individual notes, to the riffs, as popularized in for instance ring tones, through choruses and full songs, which are popularized through the single format, and to albums, that many consider cannot be listened to other than at full length. This applies in particular to the concept albums. The investigations of albums will lead to the...

An important element of architectural acoustic design is the prediction and mitigation of modal effects. Modal effects can create undesirable aural phenomena, especially in smaller rooms. The use of Bayesian methods for spectrum analysis was pioneered originally in the field of nuclear magnetic resonance spectroscopy. A time-domain model may be used with methods of Bayesian inference to analogo...

vocal fatigue is a voice symptom which is frequently reported by professional voice users. teachers, singers, actors and other professions that require prolonged voice use are especially at-risk group. the vocal fatigue results in auditory perceptual and acoustic changes in the voice signal and can lead to serious pathological conditions. the present study has examined acoustic manifestations o...