Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1997-02-10
1999-09-14
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
386 56, 360 13, G11B 1514, G11B 2700, H04N 593
Patent
active
059531720
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a recording and reproducing apparatus, and more particularly to a recording and reproducing apparatus adapted for recording video signals and speech signals (audio signals) of plural channels by using the so-called rotary head, onto a recording medium, e.g., magnetic tape after undergone conversion into digital signals, and for reproducing the video signals and the speech signals (audio signals) thus recorded.
BACKGROUND ART
Because the picture quality is not deteriorated in the digital VTR even if editing/dubbing, etc. is repeated, industrial digital VTRs are used in, e.g., the broadcasting station. In addition, appearance of digital VTR for civil use which can be used even in general home is expected.
In the home digital VTR, the recording format having track pattern on a magnetic tape 1 as shown in FIG. 1 has been proposed.
Namely, in this recording format, video signals of one frame and four channels (hereinafter referred to as channels #1, #2, #3, #4) of speech signals (audio signals) of one frame are converted into digital signals, and those digital signals are recorded by the helical system into 10 tracks TR1, TR2, TR3, TR4, TR5, TR6, TR7, TR8, TR9, TR10. More particularly, tracking signals for correctly tracking the head, speech signals and video signals are converted into digital signals, and they are respectively recorded into tracking areas 2, speech areas 3, and video areas 4 of respective tracks. In this case, respective speech signals of the channels #1, #2 are recorded into the speech areas 3 of the track TR1.about.the track TR5 after undergone interleaving, and respective speech signals of the channels #3, #4 are recorded into the speech areas 3 of the track TR6.about.the track TR10 after undergone interleaving.
In correspondence with such a recording format, as shown in FIG. 2, reproduction heads 22a, 22b of 2 channels are oppositely provided on the outer circumference of a rotary drum 20 of the digital VTR, wherein a recording head 21b is disposed at the position rotated by 60 degrees in the counterclockwise direction with respect to the reproduction head 22a, and a recording head 21a is disposed at the position opposite to the recording head 21b. Accordingly, the recording head 21a and the reproduction head 22a are spaced therebetween in terms of angle by 120 degrees. An erase (erasing) head 23 is disposed at the position rotated by 60 degrees in the clockwise direction from the reproduction head 22a between the recording head 21a and the reproduction head 22a.
When the rotary drum 20 makes one round, video signal and speech signal of one track are recorded onto the recording tape 1 one after another by the recording heads 21a, 21b. Accordingly, when the rotary drum 20 makes five rounds, video signals and speech signals of 10 tracks in total, i.e., 1 frame are recorded onto the magnetic tape 1.
On the other hand, also at the time of reproduction, similarly to the operation at the time of recording, for a time period during which the rotary drum 20 makes five rounds, video signals and speech signals of one frame (10 tracks) are reproduced from the magnetic tape 1.
A digital VTR adapted for carrying out such a recording/reproduction includes a recording system 10 and a reproduction system 30 as shown in FIG. 3.
This recording system 10 comprises an A/D converter 13 for converting a video signal into a digital signal, A/D converters 14a, 14b, 14c, 14d for respectively converting speech signals of 4 channels into digital signals, selector (changeover) switches 15a, 15b, 15c, 15d for respectively carrying out selective switching between respective speech data from the A/D converters 14a.about.14d and respective speech data from a reproduction signal processing circuit 35 which will be described later, a recording signal processing circuit 16 for implementing a predetermined signal processing to video data from the A/D converter 13 and respective speech data selected at the selector switches 15a.about.15d, recording amplifiers 17a, 17b for amplifyi
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Nakamura Kenji
Tsutsumi Isao
Frommer William S.
Neal Regina Y.
Psitos Aristotelis M.
Sony Corporation
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