DC bias

In signal processing, when describing a periodic function in the time domain, the DC bias, DC component, DC offset, or DC coefficient is the mean value of the waveform. A waveform with zero mean or no DC bias is known as a DC balanced or DC free waveform.^[1]

^ Kees Schouhamer Immink (March 1997). "Performance Assessment of DC-Free Multimode Codes". IEEE Transactions on Communications. 45 (3): 293–299. doi:10.1109/26.558690. The dc-balanced or dc-free codes, as they are often called, have a long history and their application is certainly not confined to recording practice.

[1] Kees Schouhamer Immink (March 1997). "Performance Assessment of DC-Free Multimode Codes". IEEE Transactions on Communications. 45 (3): 293–299. doi:10.1109/26.558690. The dc-balanced or dc-free codes, as they are often called, have a long history and their application is certainly not confined to recording practice.

[1]