| 摘要 |
A magnetic recording/reproducing apparatus is provided which includes a head structure compatible with a long-time play mode in handling either of two kinds of signals containing different amounts of information, such as a current digital picture signal and a high-definition (HD) digital picture signal in the rate of two to one at a constant number of revolutions of the drum by restricting an increase of the number of heads. In an aspect of the apparatus, four heads are arranged on the rotating drum equally 90 DEG spaced, a fifth head of an opposite azimuth is mounted close to any of those heads, the number of drum revolutions is increased to twice larger than the normal number, the current digital picture signal is recorded and reproduced for each channel by using two heads, that is, the fifth head and a head positioned 180 DEG opposite to the fifth head. On the other hand, the HD digital picture signal, containing twice as much information as the current digital picture signal, is recorded and reproduced for two channels by four heads equally 90 DEG spaced, exclusive of the fifth head. According to another aspect, eight heads are arranged on the rotating drum equally 45 DEG spaced, ninth and tenth heads of an opposite azimuth are mounted respectively close to any two heads 180 DEG opposite to each other, and the normal number of drum revolutions is used.
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