QuickTime 4 Reference

Enhancing Functionality with Slope and Intercept Parameters

The slope and intercept parameters make it possible to know how the sample values present in a floating point audio file will map onto the zero amplitude value and full amplitude difference of a playback device or a waveform display. This mapping depends only on slope and intercept: you can determine the voltage/Y-coordinate corresponding to a numerical sample value without looking at any other samples in the file.