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Attack and Release Time Constants in RMS-Based Feedback Compressors

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Mathematical models for feedback and feedforward compresssors are developed. A couple of possible configurations are explored: linear-output rms detector with linearly controlled VCA (linear-domain compressor) and logarithmic-output rms detector with exponentially controlled VCA (log-domain compressor). It is shown that the transfer functions of both configurations are equivalent. A formula for transforming the compression ratio of a log-domain compressor to that of a linear-domain compressor is derived. The difference between feedforward and feedback compressor configurations, with regard to time constants and performance, are considered.

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JAES Volume 47 Issue 10 pp. 788-804; October 1999
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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=12090

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