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Pre- and Post-Emphasis Techniques as Applied to Audio Recording Systems

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Audio Recorders benefit from pre- and post-emphasis which reshapes the noise spectrum to match human audibility thresholds. A 10dB increase in apparent dynamic range is realized for some digital-audio systems. A first order boost based on the CCITT J.17 pre-emphasis standard is shown to be appropriate for dynamic range expansion. A survey of peak acoustic levels present in 36 music performances is also included.

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