By Vivian Capel
A concise choice of functional and correct facts for an individual engaged on sound platforms. the themes coated comprise microphones, gramophones, compact discs, tape recording, prime quality radio, amplifiers, loudspeakers and public tackle platforms. New advancements which are coated within the moment variation comprise electronic Audio Tape (DAT), the Philips electronic Compact Cassette (DCC), boundary region microphones and the LISCA public-address loudspeaker method. some of these are defined for the 1st time, and different sections were extended. The distinct requisites of loudspeakers for digital tools and the suitability of varied kinds, was once no longer coated ahead of, yet is now incorporated. CD disc faults is one other additional characteristic
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A concise number of functional and proper information for someone engaged on sound structures. the themes coated comprise microphones, gramophones, compact discs, tape recording, prime quality radio, amplifiers, loudspeakers and public tackle platforms. New advancements which are lined within the moment version comprise electronic Audio Tape (DAT), the Philips electronic Compact Cassette (DCC), boundary area microphones and the LISCA public-address loudspeaker procedure.
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Additional info for Newnes Audio and Hi-Fi Engineer's Pocket Book
Sound travels via many paths, blocking some has little effect, all must be identified and dealth with. Air gaps around windows, doors, through ventilation ducts are a major factor and should be attended to first. Materials On encountering a denser material from air, some sound is reflected, some absorbed, and some transmitted through it. Materials that are good absorbers are generally not good insulators of airborne sound, while good reflectors usually are. Source propagation Much depends on how the sound is propagated from the source.
This doubles the overall sensitivity, so giving an accoustic gain of 6 dB. Pressure area The distance from the surface at which virtual inphase reinforcement occurs is a small fraction of the wavelength. So it becomes smaller as the frequency rises, and to obtain the effect at highest frequencies, the distance must be minute. For the phase difference to produce a loss of only 1 dB, the distance between boundary and microphone diaphragm must be γ^ of the wavelength. At 20 kHz, this is just 0052 inches.
Comparisons can thus only be made between models of the same impedance. To take account of impedance, the milliwatt is often used as a reference into a standard 600 ohms. The description is (0 dB = 1 mW into 600Ω), and the term is dBm. The voltage at 1 mW is 773 mV. These are different ways of expressing the output of the same microphone: obsolete units 01mV//*bar 0-lmV/dyne/cm 2 -80dBV//
Newnes Audio and Hi-Fi Engineer's Pocket Book by Vivian Capel