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PINK_NOISE_FILTER

2017-02-24 12:16  
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PINK_NOISE_FILTER
Used in acoustics for measuring transducer characteristics, absorption-reflection and transmission coefficients of materials, and room parameters such as reverberation time. Offsets falloff of detected noise signal at low frequencies by using filter shown to convert random-noise source from constant energy per hertz (white-noise frequency spectrum) to constant energy per octave (pink-noise response). Filter covers audio range from 10 Hz to 20 kHz, providing -20 dB per decade transmission characteristics with three 741 opamp stages. Frequency characteristic is independent of source and load impedances. Supply voltages can be from ±6 to ±18 V.-R. Mauro, Simple Pink Noise Filter. Audio. March 1977. p 36 and 38.