By Vivian Capel
A concise number of useful and correct info for somebody engaged on sound platforms. the subjects lined comprise microphones, gramophones, compact discs, tape recording, prime quality radio, amplifiers, loudspeakers and public deal with structures. New advancements which are lined within the moment version contain electronic Audio Tape (DAT), the Philips electronic Compact Cassette (DCC), boundary region microphones and the LISCA public-address loudspeaker process. these kinds of are defined for the 1st time, and different sections were improved. The particular requisites of loudspeakers for digital tools and the suitability of assorted varieties, used to be now not lined earlier than, yet is now integrated. CD disc faults is one other additional function
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Extra resources for Newnes Audio and Hi-Fi Engineer's Pocket Book
Doors Air gaps, including letter boxes and keyholes, are a major source of sound leakage, and should be eliminated. Mass is small compared to a wall, so the resonant frequency is high and there is virtually no mass-controlled region between resonance and coincidence. Doors, however, can be damped by heavy bitumous cladding on one side. Where a high degree of noise reduction is required, two doors both with air seals and separated by a small vestibule is the most effective measure. Windows Most outside noise comes through window glass.
Even so its effect is minimal when a wall has a large mass. Thus it is effective with partitions, but much less so with stone or brick walls. 28 Mass Law Sound reduction in the mass-controlled section can be calculated by the mass law. K = 201og,0(/*M)-47dB where/= frequency of the incident sound; M = surface density of the wall in kg/m 2 , (which is the mass in kg/m 2 for homogeneous materials). Physical characteristics For optimum sound reduction a wall should have low stiffness thus maximising the range between resonance and coincidence, and high mass.
Cost covers a wide range from quite cheap models to very expensive. Flatness of frequency response, hum-shielding, quality of material and construction all affect the cost. 32 Ribbon A narrow aluminium ribbon, corrugated to make it flexible, is suspended edgewise between the poles of a magnet. As there are small gaps between the edges of the ribbon and the pole pieces, the ribbon is impelled by the velocity of the air particles as they flow past it rather than sound pressure acting upon it. It is therefore also known as a velocity microphone.