Modulation in Video Tape Recorders

This paper presents the theory of pulse-frequency modulation, used for signal transmission in analog video recorders. The paper demonstrates that signal processing in recorders is of the discrete-time type, with the sampling exceeding the Nyquist rate and with restoration of the analog video output from samples in the filter-demodulator. Index Terms--Frequency modulation, magnetic tape recording, pulse position/frequency modulations, video recording.