By Gary Davis, Ralph Jones
ISBN-10: 0881889008
ISBN-13: 9780881889000
Sound reinforcement is using audio amplification platforms. This ebook is the 1st and basically publication of its type to hide all points of designing and utilizing such platforms for public deal with and musical functionality. The publication beneficial properties info on either the audio concept concerned and the sensible purposes of that idea, explaining every thing from microphones to loudspeakers. This revised variation beneficial properties virtually forty new pages and is even more uncomplicated to persist with with the addition of an index and a simplified web page and bankruptcy numbering procedure. New issues coated contain: MIDI, Synchronization, and an Appendix on Logarithms. 416 Pages.
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Additional resources for The Sound Reinforcement Handbook
Example text
SECTioN} PROBLEM: What is the ratio, in dB, of 100 watts to 10 watts? dB = = = = 10 • 10 • 10 • 10· = 10 log (P 1+PO) log (100+10) log 10 1 so the ratio of 100 watts to 10 watts is 10 dB. The two previous problems point out interesting aspects of using the dB to express power ratios: A) whenever one power is twice another, it is 3 dB greater (or if it is half the power, it is 3 dB less), B) whenever one power is ten times another, it is 10 dB greater (or ifit is 1110 the power, it is 10 dB less).
This is roughly the inverse of the 40 phon equal loudness curve illustrated in Figure 3-3. Given the sensitivity characteristic of the ear, the "A weighted" curve is most suitable for low level sound measurement (see Figure 3-4). Remember that 40 dB SPL (at 1 kHz) is equivalent to the sound of a very quiet auditorium or of the average quiet residence. In the presence of loud sounds, such as rock concerts, the ear has a "flatter" sensitivity characteristic. This can be seen by comparing the 100 or 110 phon equal loudness curves (which are the typical loudness at such concerts) to the 40 phon curve.
A sound system's dynamic range can be increased by increasing the maximum sound level capability, or by making the environment quieter. Sometimes acoustic treatment can be applied, and this is a good approach in concert halls (not only to increase dynamic range, but to cut down on excess reverberation). At other times, particularly with portable sound systems, there is virtually no practical way to do much to the ambient noise levels. That leaves the "increase the sound level" option. Increasing the maximum sound level capability of a sound system runs the costs of the system up very rapidly (exponentially, in fact).
The Sound Reinforcement Handbook by Gary Davis, Ralph Jones
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