摘要:

This paper suggests the establishment of an Institute of Musical Science designed to provide a scientific basis and techniques whereby music may contribute more fully to the esthetic life of a larger number of people. The program of research of the Institute extends from the physics of the production of musical sounds to the psychology of their appreciation by listeners. It would measure and study audience reaction under a wide variety of conditions. It would undertake the experimental development of new musical instruments, of new electro-acoustical systems for the production or reproduction of esthetic sounds; and it would study the possibilities of synthetic orchestras and new techniques or orchestration. It would experiment in the application of sound effects to dramatic and operatic performances. Techniques would be worked out for the measurement of musical talent, and scientific apparatus developed for the musical education of individuals and the training of choral or instrumental groups. It would apply to the problems of music the techniques and instrumentalities which have been developed in the fields of acoustics, electrical communications, and electronics. Particular attention would be given to music in the home, and to applications to its needs of devices inherent in recent engineering advances.

ISSN:0001-4966    

DOI:10.1121/1.1916514

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916515

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

摘要:

Decay curves were recorded for an upright piano, a baby grand, and an electronic spinet. For some tones the partials were recorded separately. Decay rates for the electronic piano were measured at different levels of piano amplification. Analysis of the data reveals the degree of control exerted by the sounding board upon decay rate, particularly in the initial stage of decay. The significance of this control by the sounding board is discussed, in relation to the problem of electrical amplification of piano tones.

ISSN:0001-4966    

DOI:10.1121/1.1916516

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916517

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916518

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916519

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

摘要:

Frequency range preference tests for reproduced speech and music indicate that listeners prefer a restricted frequency range in monaural reproduced speech and music. In order to obtain a better understanding of the reason for the preference of a restricted frequency range in reproduced sound, a fundamental all‐acoustic frequency range preference test has been made. An acoustical filter was placed between the orchestra and the listeners and arranged so that the filter can be turned in and out. A sheer cloth curtain which transmits sound without any appreciable attenuation was placed between the acoustical filter and the listeners. The curtain was illuminated so that the listeners could not see what transpired behind the curtain. The response‐frequency characteristic of the acoustical filter was 5000‐cycle low pass transmission. The response approximated a good commercial radio or phonograph. The tests made up to the present time have been conducted in a small room which simulates the average living room in dimensions and acoustics. A six‐piece orchestra playing popular and semi‐classical music was used in these tests. Tests involving one thousand listeners indicated a preponderant preference for the full frequency range. Similar results have been obtained for speech.

ISSN:0001-4966    

DOI:10.1121/1.1916520

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

摘要:

Studies on rigid acoustical tiles and soft blankets are described in this paper. It is shown that two waves travel through the material—one primarily airborne and the other primarily structure‐borne. From a knowledge of the density of the sample, the volume coefficients of elasticity of the air and of the skeleton of the material, the porosity, the air flow resistance, the inter‐fiber frictional resistance, and the structure factor, the propagation constants of each of these waves can be calculated. The experimental results indicate that the theory is useful in calculating the performance of the flexible, airplane type of blankets over the entire audible frequency range. For rigid tiles, however, the theory appears to fail at frequencies above 1000 c.p.s. if the flow resistance is high, and it fails at all frequencies for materials with low flow resistance. Experiment shows that the condensations and rarefactions of the gas in blankets take place isothermally at low frequencies and adiabatically at high. The transfer from one state to the other occurs gradually in the 100 to 2000 c.p.s. region. A more complete theory is required to explain the effects of thermodynamic and viscous losses on the propagation constant of rigid materials.

ISSN:0001-4966    

DOI:10.1121/1.1916521

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

摘要:

Formulas are derived for the acoustical impedance of three types of enclosures, a sphere, a cylinder, and a narrow rectangular box. The solutions are valid throughout the entire range from adiabatic to isothermal conditions.

ISSN:0001-4966    

DOI:10.1121/1.1916522

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP

摘要:

The diffraction of a plane wave of sound caused by right‐angled joints in rectangular tubes is computed by calculating the impedance elements of the equivalent circuit for the discontinuities, the propagation of the principal wave being represented by the voltage and current on a transmission line. A numerical example is given.

ISSN:0001-4966    

DOI:10.1121/1.1916523

出版商:Acoustical Society of America    

年代:1947

数据来源: AIP