FIG. 1.

Schematic of hypothetical frequency remapping functions that demonstrate tradeoffs when using NFC to remap speech into a fixed output BW (horizontal dotted line). The abscissa and ordinate represent the input and output frequencies, respectively, and the solid black line in each panel represents the frequency input-output function, with the black dot corresponding to the start frequency. Where the input-output function intersects with the output BW (vertical dashed line) is the input BW, the maximum input frequency represented in the audible range after lowering. (a) Setting with a low SF and a low CR; (b) the opposite in which a higher SF is traded for a higher CR in order to maintain an equivalent input BW; (c) a high SF is combined with a low CR, thereby, sacrificing input BW.