Practical Applications
A DC tape bias was used in early tape recorders to reduce distortion.
A DC bias is applied to the control grid vacuum tubes in power amplifiers in order to regulate power.
DC-balanced signals are used in communications systems to prevent bit errors when passing through circuits with Capacitive coupling or transformers. Bit errors can occur when a series of 1's create a DC level that charges the capacitor of the high-pass filter used as the AC coupler, bringing the signal input down incorrectly to a 0-level. In order to avoid these kinds of bit errors, most line codes are designed to produce DC-balanced waveforms. The most common classes of DC balanced line codes are constant-weight codes and paired-disparity codes.
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“No delusion is greater than the notion that method and industry can make up for lack of mother-wit, either in science or in practical life.”
—Thomas Henry Huxley (1825–1895)