System information
Contrast decreased with a contrast center of 0.0: the histogram is squeezed into a narrower portion of the
spectrum anchored at the left edge of the graph.
Contrast decreased with a contrast center of 1.0: the histogram is squeezed into a narrower portion of the
spectrum anchored at the right edge of the graph.
Crossfade
Mixing two pieces of media by fading one out as the other fades in.
Cutoff frequency
The cutoff-frequency of a filter is the frequency at which the filter changes its response. For example, in a
low-pass filter, frequencies greater than the cutoff frequency are attenuated while frequencies less than the
cutoff frequency are not affected.
D
DC Offset
DC Offset occurs when hardware, such as a sound card, adds DC current to a recorded audio signal. This
current causes the audio signal to alternate around a point above or below the normal -infinity dB (center)
line in the sound file. To visually see if you have a DC offset present, you can zoom all the way into a sound
file and see if it appears to be floating over the center line. In the following example, the red line represents
0 dB. The lower waveform exhibits DC offset; note that the waveform is centered approximately 2 dB above
the baseline.
636CHAPTER 34