Showing papers in "Applied Acoustics in 1969"

TL;DR: In this article, it was found that the sound insulation of a glass window depends on the method by which it is mounted and the variations in insulation found are due to the differences in edge damping provided by the different window frames.

TL;DR: In this paper, the authors consider the correlation between acoustical processes (natural or simulated) and subjective listening assessments and conclude that lateral reflections are most important in creating a subjective impression of space.

TL;DR: Mechanisms of noise measuring technique that are becoming generally adopted are summarized in the hope that this will be a useful framework upon which developments in technique may be based.

TL;DR: In this paper, the development of a scale model technique for the study of the sound field in landscaped offices is described, and results of pilot studies are given, and comparisons made with measurements in a full-size office, and with calculations based on a simple theoretical model.

TL;DR: In this paper, a series of sound insulation measurements which were carried out in the transmission loss laboratory at the University of Liverpool are described, and some conclusions are drawn about the effect of absorbing materials on sound insulation.

TL;DR: In this article, the need for ease of communication, privacy and freedom from annoyance determine the acoustic requirements for an office, and in particular they lead to the control of the background noise in some offices this means keeping noise levels down but in others it is necessary to introduce background noise to maximize privacy and to minimise annoyance.

TL;DR: In this paper, the authors investigate the effect of non-physical antecedents on the response of people to low-level, rapid-event noise events such as aircraft flyovers and other community noise.

TL;DR: In this paper, the historical and present day role of the dB(A) is discussed, including the relationship between dBA and other noise rating scales, and the interaction between various noise spectra and partitions is examined to determine the relationship among dB( A) insulation and average dB insulation.

TL;DR: In this paper, it is proposed that the overall subjective effect of noise may be a combination of these and other factors; this would account for the unsuccessful attempts of most previous work to find a high correlation between an individual score on a psychological scale and physical noise measurements.

TL;DR: In this article, a series of sound insulation measurements in the laboratory, on approximately 30 types of glazing, and a study of the means of arranging all data obtained in such a way that the optimum solution, in a practical case can be found.

TL;DR: In this paper, a survey of the ways in which the impact sound insulation problem is tackled in The Netherlands, without giving up the hammer machine is given. But it is also shown that introduction of a 'footstep machine' is not a simple solution.

TL;DR: In this article, it was shown that an extrapolation of the amplitude of reflection coefficient to zero distance is easier than that of pressure minima and that attenuation constant is determined by the slope of the straight line at the same time.

TL;DR: In this article, the vibration characteristics of a number of commercially prepared Ni-Co-Cr alloy magnetostrictive transducers have been measured and the suitability of mounting the transducers at the nodal point of the probe has been investigated.

TL;DR: In this article, an acoustic design guide has been compiled for use by designers in the preliminary stages of the design of offices and domestic dwellings, and nine subjects carried out a series of simulated design tasks, both with and without the guide.

TL;DR: In this paper, the results of some field trials of a sonar system which uses a digital signal processing unit are presented mainly in the form of the system range/bearing display and these indicate that the system is suitable to detect mid-water fish shoals and to study their behaviour.

TL;DR: In this paper, the authors utilise les lois de la similitude for essayer de mettre en evidence the possibilite d'obtenir des resultats comparables dans des salles differentes.

TL;DR: In this paper, the A scale level and the frequency spectrum of the noise expected in a typical 1000 ft3 room with a reverberation time of 1 2 sec were determined, and the acoustic power of the machine was also calculated.