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US 5,706,385 AGranted
Rotary head type magnetic recording and reproducing apparatus
AssigneeHitachi, Ltd.
InventorsHideaki Suzuki, Susumu Yoshida, Nobutaka Amada, Toshifumi Takeuchi, Takao Arai
Life of this patent
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Abstract
A rotary head type magnetic recording and reproducing apparatus for recording and reproducing an analog wide-band video signal, audio signal and compressed digital signal on the same recording medium. The modulated analog wide-band video signal or the narrow-band-converted compressed digital signal is recorded on two video tracks adjacent to each other on a magnetic tape by magnetic heads on a rotary drum.
Claims32
A rotary head type magnetic recording and reproducing apparatus comprising:
- a first recording signal generating circuit for generating a first recording signal to be recorded on a magnetic tape from an input analog video signal;
- a second recording signal generating circuit for generating a second recording signal to be recorded on said magnetic tape from an input analog audio signal;
- a third recording signal generating circuit for generating a third recording signal to be recorded on said magnetic tape from an input compressed digital signal including video and audio information;
- a recording and reproducing mechanism, operably connected to said first, second, and third recording signal generating circuits and including a plurality of recording and reproducing magnetic heads mounted on a rotary drum, for recording at least said first and third recording signals switchably and said second recording signal on said magnetic tape in recording, and for reproducing the recorded signals from said magnetic tape in reproduction;
- a first reproducing circuit, operably connected to said recording and reproducing mechanism, for restoring said input analog video signal from said first recording signal reproduced by said recording and reproducing mechanism;
- a second reproducing circuit, operably connected to said recording and reproducing mechanism, for restoring said input analog audio signal from said second recording signal reproduced by said recording and reproducing mechanism;
- a third reproducing circuit, operably connected to said recording and reproducing mechanism, for restoring said video and audio information from said third recording signal reproduced by said recording and reproducing mechanism;
- and
- a change-over circuit for changing over said first and third recording signals according to which of said input analog video signal and said input compressed digital signal is to be recorded;
- wherein said recording and reproducing magnetic heads include at least a first group of magnetic heads mounted on said rotary drum;
- wherein said input analog video signal or input compressed digital signal is recorded on said magnetic tape by said first group of magnetic heads;
- and
- wherein said third recording signal generating circuit includes a circuit for converting said input compressed digital signal to have substantially the same frequency allocation as said input analog video signal, thereby generating said third recording signal.
10 more elements
A rotary head type magnetic recording and reproducing apparatus comprising:
- a first recording signal generating circuit for generating a first recording signal to be recorded on a magnetic tape from an input analog video signal;
- a second recording signal generating circuit for generating a second recording signal to be recorded on said magnetic tape from an input analog audio signal;
- a third recording signal generating circuit for generating a third recording signal to be recorded on said magnetic tape from an input compressed digital signal including video and audio information;
- a recording and reproducing mechanism, operably connected to said first, second, and third recording signal generating circuits and including a plurality of recording and reproducing magnetic heads mounted on a rotary drum, for recording at least said first and third recording signals simultaneously or switchably and said second recording signal on said magnetic tape in recording, and for reproducing the recorded signals from said magnetic tape in reproduction;
- a first reproducing circuit, operably connected to said recording and reproducing mechanism, for restoring said input analog video signal from said first recording signal reproduced by said recording and reproducing mechanism;
- a second reproducing circuit, operably connected to said recording and reproducing mechanism, for restoring said input analog audio signal from said second recording signal reproduced by said recording and reproducing mechanism;
- and
- a third reproducing circuit, operably connected to said recording and reproducing mechanism, for restoring said video and audio information from said third recording signal reproduced by said recording and reproducing mechanism;
- wherein said recording and reproducing heads include a first group of magnetic heads mounted on said rotary drum, and a second group of magnetic heads mounted on said rotary drum;
- wherein said first recording signal is supplied to said first group of magnetic heads;
- wherein said second recording signal is supplied to said second group of magnetic heads;
- and
- wherein said third recording signal generating circuit includes a first converter circuit for converting said input compressed digital signal into a signal of a frequency band different from that of said second recording signal, and supplying said converted signal as said third recording signal to said second group of magnetic heads.
10 more elements
Dependencies are inferred from the claim text.