An electrical signal of relatively high frequency applied to magnetic tape during the recording process, along with the audio signal, to linearize the transfer characteristic of magnetic recording tape. The bias frequency is generally in the range of 70 to 120 kHz (HF bias).
"I just want to tell you that it was a great experience to work with you. It sounded awesome. Brought back so many memories. Everything from the recording to the artwork was done perfectly! Thanks."