Systems for recording both information and pilot signals directly on recording medium

A system for recording information and pilot signals directly on recording medium, said system comprising:

• means for generating a rectangular waveform signal of a single and specific frequency;
• means responsive to said rectangular waveform signal for generating an artificial horizontal synchronizing signal which is synchronized in every horizontal scanning period of a standard television video signal;
• means responsive to the artificial horizontal synchronizing signal for generating a duration signal which is equivalent to the duration of an artificial horizontal synchronizing signal;
• means for generating first, second and third pilot signals for enabling a tracking control, said first and second pilot signals having frequencies which differ alternately during every one-revolution period of a recording medium, and said third pilot signal being recorded at a switching position where the first pilot signal and the second pilot signal alternate, and means for adjusting the frequencies of those three pilot signals into a region other than the vicinity of the frequency of the rectangular waveform signal;
• means for positioning the rectangular waveform signal within the duration of the artificial horizontal synchronizing signal and for time compressing a pulse code modulated or delta modulated digital audio signal so that the digital audio signal exists in a time interval other than the artificial horizontal synchronizing signal duration;
• means comprising a specific modulating system for encoding the compressed audio digital signal and for generating the digital audio signal successively;
• and
• means for recording the digital audio signal and the rectangular waveform signal along a main track on a recording medium and for respectively recording the first and the second pilot signals alternately along pilot signal tracks which are contiguous to the recording medium and for recording the third pilot signal at the switching point of the first and the second pilot signals.