Special-purpose component for implementing an "expander static curve" for use in the element-by-element construction of a dynamic range expander. The control signal input is assumed to originate from the mean-square measurement of an audio signal, converted to a logarithmic scale in base-2. This "dB" signal measurement is multiplied by 0.5, and subtracted from the expander threshold (adjustable via the Parameter Window). If the resulting difference is positive, the control output is made equal to the difference multiplied by the quantity (1-R), where R denotes the expansion ratio (adjustable via the Parameter Window). Otherwise, the output is set to zero. It is intended that the output is sent to a Control AntiLog2 component for conversion from the logarithmic scale into a gain value. IMPORTANT: This component is not intended for any use other than the specialised application described above.
See [Zo] section 7.1 for an explanation of "static curves", and section 7.3.2 for a discussion specific to the implementation of an "expander static curve".
