By Michael Talbot-Smith
A convenient resource of crucial facts that each sound technician wishes. even if you're a specialist sound engineer, accountable for broadcast or studio recording, or a scholar on a tune know-how or sound recording direction, you will discover this publication authoritative and simply obtainable. tailored from the great quantity, the Audio Engineer's Reference e-book (now in its moment edition), this pocket-sized reference has been absolutely revised to hide the very newest know-how hooked up with sound:Noise size AcousticsMicrophonesLoudspeakersMixing equipmentCDs, DAT, MIDI, MiniDisc TelephonyISDNDigital interfacingUltrasonics This moment version additionally features:Substantial revisions of chapters on radio microphone frequencies, electronic audio tape, and audio measurements.An prolonged checklist of extra examining. convenient pocket-sized referenceStraightforward explanationsMust-have proof and figures for Sound Engineers
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Additional info for Sound Engineer's Pocket Book, Second Edition
Speciﬁc acoustic impedance, Zs ϭ p/x . Analogous acoustic impedance ϭ p/x A, where A is the area of the element and p is sound pressure Admittance ϭ 1/Z . Transformations: F ϭ Bli; v ϭ Blx .. Newton’s laws: FϭMx .. Kinetic energy ϭ 1⁄2 Mx 2 Potential energy ϭ 1⁄2 sx2 32 Electromechanical analogies The following table is more complete than the one on page 31 and includes magnetic units. 854 ϫ 10Ϫ12 ϭ (1/36) ϫ 10Ϫ9 farads/m volts/metre coulombs/metre2 coulombs/metre2 farads ϭ coulombs/volt 33 34 Electromechanical analogies Figure 11 shows the acoustic elements and their electrical equivalent circuits.
E. is it different in the vertical plane compared with the horizontal plane? 9. Is the directivity ﬁxed or variable? If variable is the control on the body of the microphone or is there a remote unit? What patterns are available and how good are they? Physical 10. Physical dimensions. 11. Weight. 12. g. matt or shiny. Reliability 13. Can trouble-free service be expected? This can probably only be ascertained by referring to other users with experience of this microphone. 14. Does it appear to be robust?
Noise level reading, LAeq,T minus background, LA90,T dB Correction: subtract from noise level reading dB 6 to 9 4 to 5 1 2 <3 Difﬁcult to correct Addition of noise levels Noise levels in dB cannot meaningfully be added together, as, being logarithms the result will be a multiplication. Antilogs of the readings must be used, as shown below. Note that the noise reading should be divided by 10 before ﬁnding the antilog as antilogs of 100 or more will result in an ERROR indication on normal calculators.