Abstract
The paper describes a magnetic tape recorder for low frequency which uses a parametric reproducing head. The head is based on parametric oscillation in a resonant circuit comprised of a head and a variable capacitance in order to reproduce low frequency signals, which is difficult to achieve by conventional methods. The output voltage of the equipment is dependent only on the magnetic field of the input recording signal and is independent of the frequency of that signal. Consequently, the equipment has an output proportional to the input and a constant frequency response from zero to about 100 Hz. Here, the operation of the equipment is analyzed theoretically and good features are described.
