Magnetic recording and/or reproducing apparatus

A magnetic reproducing apparatus comprising:

• reproducing means provided with a rotary magnetic head device and tape guide means for guiding a magnetic tape on which a recording signal obtained based on digital data having a predetermined transmission rate is recorded in each of oblique record tracks and operative to cause the rotary magnetic head device to contact with the magnetic tape for scanning the oblique record tracks to reproduce the recording signal from the magnetic tape;
• head driving means for rotating said rotary magnetic head device at a predetermined speed of rotation;
• tape driving means for causing the magnetic tape to run at a speed selected from a plurality of predetermined speeds satisfying a predetermined relation of ratio;
• demodulating means for reproducing the digital data based on the recording signal reproduced by said rotary magnetic head device;
• time base processing means for causing the digital data obtained from said demodulating means to be subjected to time base conversion so as to produce modified digital data having a predetermined transmission rate selected correspondingly to the selected speed of the magnetic tape;
• and
• decoding means for producing, based on the modified digital data obtained from said time base processing means, reproduced digital data representing an information signal.

A magnetic recording and reproducing apparatus comprising:

• an input terminal to which an information signal is applied;
• encoding means for encoding the information signal supplied from the input terminal to one of plural kinds of digital data which have different transmission rates respectively;
• first time base processing means for selectively converting a time base of the digital data obtained from said encoding means so as to produce modified digital data having a predetermined transmission rate;
• modulating means for producing a recording signal corresponding to the modified digital data obtained from said first time base processing means;
• recording and reproducing means provided with a rotary magnetic head device and tape guiding means for guiding a magnetic tape on which the recording signal is to be recorded and operative to cause said rotary magnetic head device to contact with the magnetic tape for forming oblique record tracks on the magnetic tape and scanning oblique record tracks formed on the magnetic tape;
• head driving means for rotating said rotary magnetic head device at a predetermined speed of rotation;
• tape driving means for causing the magnetic tape to run at a predetermined speed corresponding to the transmission rate of the encoded digital data obtained from said encoding means,
• demodulating means for reproducing the modified digital data based on the recording signal reproduced by said rotary magnetic head device from the magnetic tape;
• second time base processing means for selectively converting a time base of the modified digital data obtained from said demodulating means so as to produce the encoded digital data having the predetermined transmission rate;
• and
• decoding means for decoding said encoded digital data obtained from said second time base processing to digital data representing the information signal.