ITU-R 468 noise weighting - Wikipedia
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1000Hz is used in acoustics as reference frequency for testing. What is special in it, why not 688.5Hz or 440Hz? - Quora
What are A, C & Z Frequency Weightings? - NoiseNews
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What are A, C & Z Frequency Weightings? - NoiseNews
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A, C & Z Frequency Weightings Explained
Sound Level Measurement
