Dynamic Range Controllers (DRCs) find wide application in the recording and reproduction of audio signals. With the advent of powerful, low-cost digital signal processing hardware, the potential for creating low-cost Digital Dynamic Range Controllers (DDRCs) has increased. Previous DDRC designs [I, 21 used expensive custom hardware and were typically re-implementations of traditional architectures [3, 41. This paper describes the design and real-time implementation of a single-channel DDRC. The design uses adaptive recovery and signal measurement to improve performance.DRCa are described by their static and dynamic characteristics. Static characteristics describe the DRC output response to constant level (periodic) signals. The static characteristics are typically aplit into four regions (Figure 1) : expansion', no-action, compression and limiting. The regions are separated by
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