Digital video tape recorder that can be used with different television systems

摘要

A digital video tape recorder (VTR) for use with an NTSC, PAL or SECAM television signal includes a reference signal generating circuit which generates a reference signal having a frequency of 13.5 MHz; a first frequency dividing circuit (1/45045) for use with an NTSC television signal; a second frequency dividing circuit (1/45000) for use with a PAL or SECAM television signal; and a switch which supplies a first or second frequency control signal to a magnetic recording head for recording a pulse of the control signal at the lower edge of a magnetic tape for each of successive, parallel tracks extending obliquely on the magnetic tape in which a television signal is recorded. A discriminator circuit detects whether the television signal to be recorded is NTSC, PAL or SECAM format and controls the switch to supply the appropriate frequency control signal to the magnetic recording head.