Recording bias setting device for a magnetic recording and reproducing apparatus

Abstract

This invention pertains to a recording bias setting device for a magnetic recording and reproducing apparatus. The recording bias setting device comprises means to record and reproduce an AC test signal, means to select a bias current value from among a plurality of predetermined bias current values for recording said AC test signal, an information processor to control said means to select a bias current value in accordance with a reproduced output level of said AC test signal whereby the bias current value is set, said information processor including means to detect a semipeak reproduced output level depending on a semipeak bias current value which provides the maximum reproduced output level of said test signal among the selected bias current values, means to detect among said selected bias current values a first bias current value less than said semipeak bias current value and a second bias current value greater than said semipeak bias current value, both of which provide reproduced output levels lower than said semipeak reproduced output level by substantially equal amounts, and means to control said means to select a bias current value so that the bias current is set at a value substantially equal to an average value of said first and second bias current values.

Dependencies are inferred from the claim text.