Magnetic recording and/or reproducing system

In a system in which television signals comprising line intervals and field intervals are recorded on a recording medium by rotary transducer means, the television signal including chrominance components, the system including switching means to cause at least selected ones of the chrominance components to have one polarity in every line interval in alternate field intervals and to change from the one polarity to the opposite polarity at the end of selected line intervals of the remaining alternate field intervals, switch controlling means comprising:

• A. a first flip-flop responsive to a first timing signal at the field repetition rate;
• B. a signal generator to generate signals synchronous with rotation of the transducer means, said signal generator being connected to a control terminal of said flip-flop to control the polarity of the output signal therefrom to have a specific polarity during even fields and reverse polarity during odd fields;
• C. a second flip-flop responsive to a second timing signal at the line repetition rate;
• and
• D. a connection from an output terminal of said first flip-flop to a controlling input terminal of said second flip-flop to allow said second flip-flop to operate only during those alternate fields when the output signal of said first flip-flop has a predetermined one of said polarities, said second flip-flop having an output signal of predetermined polarity for the first line interval of each of the fields in which the second flip-flop operates.