ABSTRACT
Analog Sound Recording In an analog audiotape recorder the signal is fed, in the form of an electric current, to a head consisting of an electromagnet with a very small gap between the poles (Figure 14.1). As the tape passes over the head in contact with it, it becomes magnetized in proportion to the signal, retaining its magnetism as it is wound
onto a receive spool. When the magnetized tape is run through the same equipment, the fluctuating magnetic field preserved in the track induces a current in the head that duplicates the signal, and can be amplified to produce a replica of the original sound.
