Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-05-30
1988-06-21
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
358343, 358346, H04N 576
Patent
active
047528354
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an audio signal generating apparatus for generating in synchronism with a composite video signal an audio signal which is to be recorded, when producing a video disc, that is, a rotary recording medium recorded with a television signal comprising a composite video signal and an audio signal.
BACKGROUND ART
A video disc which is recorded with a television signal comprising a composite video signal and an audio signal is recorded with a plurality of fields of the television signal in one track turn (description will hereinafter be given for a case where four fields are recorded), in order to realize a large recording capacity under limitations such as practical diameter and rotational speed of the disc and a relative linear velocity between a pickup and the disc for obtaining a satisfactory signal-to-noise ratio. When playing this video disc in a still picture reproduction mode, the same track turn is scanned repeatedly. For this reason, in the still picture reproduction mode, the audio signal in the reproduced television signal is generally muted and the sound is not generated, while information in the four fields of the composite video signal are reproduced repeatedly. However, in the case where the picture content of the video signal which is to be reproduced relates to a moving picture, the pictures of the four fields recorded in one track turn are mutually different, and the picture reproduced in the still picture reproduction mode will not appear still but will appear as if it is undergoing a reciprocating movement. Hence, the reciprocating movement in the picture reproduced in the still picture reproduction mode becomes large as the movement in the moving picture becomes fast, and there is a disadvantage in that the picture reproduced in the still picture reproduction mode does not appear still and is awkward.
On the other hand, it is possible to consider recording a video information content of the same field repeatedly for four fields in one track turn and obtain a still picture by repeatedly scanning this one track turn. In this case, only the video information content of the same field is reproduced repeatedly even when the same track turn is scanned repeatedly, and it is possible to obtain a perfectly still picture.
However, when the video information of a first field is recorded repeatedly for four fields in a first track turn, the video information of a fifth field is recorded repeatedly for four fields in a second track turn and the video information of the same field is thereafter recorded repeatedly in each track turn for every four fields, it is possible to obtain a perfectly still picture in the still picture reproduction mode but a movement in the reproduced picture is awkward in a normal reproduction mode because 3/4 of the video information is missing.
On the other hand, when the video information of a first field is recorded repeatedly for four fields in a first track turn, the video information of a second field is recorded repeatedly for four fields in a second track turn and the video information of each field is thereafter recorded repeatedly in each track turn, it is possible to obtain a perfectly still picture in the still picture reproduction mode but there is a disadvantage in that a slow motion picture is reproduced in the normal reproduction mode because the video information of each field is reproduced four times. Furthermore, there is a disadvantage in that the audio signal cannot be reproduced normally from the disc which is recorded with the video information so that the perfectly still picture can be obtained in the still picture reproduction mode.
Accordingly, a disc was proposed in a U.S. Pat. No. 4,490,752, a British patent No. 2,099,202 and a West German patent No. 3212134.2-09 in which the assignee or applicant is the same as the applicant of the present application. According to the proposed disc, a video signal of the same unit is recorded repeatedly for a plurality of fields in each track turn, and divided audi
REFERENCES:
patent: 4065795 (1977-12-01), Shutterly
patent: 4142209 (1979-02-01), Hedlund et al.
patent: 4227213 (1980-10-01), Isobe
patent: 4353090 (1982-10-01), Broadbent
patent: 4402018 (1983-08-01), Wada et al.
patent: 4463389 (1984-07-01), Golding
patent: 4490752 (1984-12-01), Machida et al.
patent: 4510531 (1985-04-01), Sugiyama
patent: 4611248 (1986-09-01), Honjo et al.
McElheny Jr. Donald
Meller Michael N.
Victor Company of Japan Ltd.
LandOfFree
Audio signal generating apparatus for generating an audio signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Audio signal generating apparatus for generating an audio signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio signal generating apparatus for generating an audio signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-932325