Information signal recording medium reproducing apparatus with an improved equalizer

An information signal recording medium reproducing apparatus comprising:

• an equalizer supplied with a frequency modulated composite video signal picked up from an information signal recording medium which is recorded with the frequency modulated composite video signal;
• a frequency demodulator supplied with an output signal of said equalizer for frequency-demodulating the output signal of said equalizer to produce a composite video signal;
• a synchronizing signal separating circuit supplied with the composite video signal from said frequency demodulator for separating a horizontal synchronizing signal from the composite video signal;
• and
• a switching signal generating circuit supplied with the horizontal synchronizing signal from said synchronizing signal separating circuit for forming a switching signal from the horizontal synchronizing signal,
• said equalizer being supplied with the switching signal from said switching signal generating circuit and having such a circuit construction that a peak frequency at which an output level of said equalizer becomes maximum as a function of frequency is reduced responsive to said switching signal during a predetermined time period in a vicinity of a front edge of the horizontal synchronizing signal so as to correct a distorted waveform of the frequency modulated composite video signal, said distorted waveform being caused by defects in the information signal recording medium.