Electroacoustical Reference Data by John Eargle

By John Eargle

The want for a basic number of electroacoustical reference and layout info in graphical shape has been felt by way of acousticians and engineers for your time. this kind of info can differently in basic terms be present in a suite of handbooks. for that reason, it's the author's purpose that this ebook function a unmarried resource for lots of electroacoustical reference and method layout necessities. In shape, the amount heavily resembles Frank Massa's Acoustic layout Charts, a convenient ebook relationship from 1942 that has lengthy been out of print. the fundamental structure of Massa's publication has been right here: for every access, graphical facts are awarded at the correct web page, whereas textual content, examples, and refer­ ences look at the left web page. during this demeanour, the consumer can remedy a given challenge with out thumbing from one web page to the following. All graphs and charts were scaled for ease in information access and studying. The ebook is split into the subsequent sections: A. common Acoustical Relationships. This part covers the habit of sound transmis­ sion in reverberant and loose fields, sound absorption and diffraction, and directional characteris­ tics of easy sound radiators. B. Loudspeakers. Loudspeakers are mentioned when it comes to easy relationships relating to cone day trip, sensitivity, potency, and directivity index, energy scores, and architectural structure. c. Microphones. the subjects during this part comprise microphone sensitivity and noise score, research of directional homes, stereo microphone array features, proximity results, and boundary stipulations. D. sign Transmission.

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Example text

2) in which the reverberant level has been fixed at 94 dB Lp. The curves on the graph represent various reverberation times. 2 or less. For a room with a volume of 10,000 cubic meters and a reverberation time of 5 seconds, find the acoustical power required to produce a reverberant Lp of94 dB. EXAMPLE: Locate 10,000 along the abscissa and move upward to the bold line marked 5 seconds. 2 watts. For a loudspeaker with a nominal efficiency of 2%, an input power of 10 watts would be required to produce the desired level.

The small crosses indicate data points for selected Japanese auditoriums taken from the Acoustical Society of America publication Hallsfor Music Peiformance. 5%.

By comparison, the Sabine equation will give a finite value of reverberation time when the average absorption coefficient approaches unity. Nevertheless, many consultants prefer to use the Sabine equation. Riferences: Beranek (1954) Knudsen and Harris (1950) 39 GENERAL ACOUSTICAL RELATIONSHIPS <:> iii <:> jg ~ -In (1 - a) ~ ~ ill ~ ~ 8: I I II11IIII11I1 I I I I I II I I I III1II I I I III1 I I ", IlIiIrI lIIl lI I' IIII' 1 I I I II 11" II d 111 1 ' I I o g 0 U1 ~ ~ a (average absorption coefficient) ~ ~ Figure 19_ Relation between a and -In (l-{l) in Reverberation Time Calculations t 40 ELECTROACOUSTICAL REFERENCE DATA 20.

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