| 摘要 |
In a method for writing information into a magnetic tape at different depth by means of a writing current signal to be supplied to a magnetic writing head, the writing current signal (S) is composed of a first low-frequency writing current signal (SLF1) and a high-frequency writing current signal (SHF) which is pulse width modulated by means of a second low-frequency writing current signal (SLF2). By using this method, information can be efficiently written into a magnetic tape at different depth. In particular the first and the second low-frequency writing current signal form a similar low frequency writing current signal, such as, for instance, a servo current signal, and the pulse width modulation is such that the low-frequency component in the pulse width modulated signal, for instance a bias current signal, is in opposite phase with the latter low-frequency writing current signal, and the magnetization in the top layer of the magnetic tape through the pulse width modulated current signal is opposed to the magnetization through the latter low-frequency writing current signal. |
