SOUNDTEC 3

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– – – SOUNDTEC 3 Noise Reduction Point Source (spherical spreading) NR = 20 log r2/r1 (lose 6 dB) Linear (cylindrical spreading) NR = 10 log r2/r1 (lose 3 dB) Planar source NO NR Inverse Square Law = intensity vs distance = for each distance loses -6 dB Maximum Gain before Feedback = ndB - 20log (D2/D1) = ndB - 20log (D0/Ds) where ndB is the level of lecturer’s voice Max gain (actual) = 20log (D0) - 20log (Ds) + 20log(D1) - 20log (D2) - 6

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sountec 3

Transcript of SOUNDTEC 3

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SOUNDTEC 3

Noise Reduction

Point Source (spherical spreading) NR = 20 log r2/r1 (lose 6 dB)Linear (cylindrical spreading) NR = 10 log r2/r1 (lose 3 dB)Planar source NO NR

Inverse Square Law = intensity vs distance = for each distance loses -6 dB

Maximum Gain before Feedback = ndB - 20log (D2/D1) = ndB - 20log (D0/Ds) where ndB is the level of lecturer’s voice

Max gain (actual) = 20log (D0) - 20log (Ds) + 20log(D1) - 20log (D2) - 6

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