Abstract: A recording mode identifying circuit is provided for use in a magnetic recording and/or reproducing apparatus capable of recording a color video signal in a first or low-band mode in which a luminance signal is recorded as a frequency modulation of a first carrier frequency and a second or high-band mode in which the luminance signal is recorded as a frequency modulation of a second carrier frequency.

Abstract: The detection of whether an input FM signal, such as a reproduced signal, which includes particular frequency components representing predetermined information, was recorded in a first or second mode, with the modes having different frequency bands. A first output signal is produced when a particular frequency component in one of the frequency bands is detected and a second output signal is produced when a different frequency component, approximately equal to the difference between twice a predetermined frequency included in the other of the frequency bands and the particular frequency in the one frequency band, is detected. A mode identifying signal indicative of the frequency band occupied by the FM signal is produced in response to the first and second output signals.