GB2107507A - Rotary recording medium - Google Patents

Rotary recording medium Download PDF

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Publication number
GB2107507A
GB2107507A GB08227116A GB8227116A GB2107507A GB 2107507 A GB2107507 A GB 2107507A GB 08227116 A GB08227116 A GB 08227116A GB 8227116 A GB8227116 A GB 8227116A GB 2107507 A GB2107507 A GB 2107507A
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United Kingdom
Prior art keywords
reproducing
signal
recorded
track
kick
Prior art date
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Granted
Application number
GB08227116A
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GB2107507B (en
Inventor
Hiroyuki Sugiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victor Company of Japan Ltd
NIPPON VICTOR KK
Original Assignee
Victor Company of Japan Ltd
NIPPON VICTOR KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP56151606A priority Critical patent/JPS6327780B2/ja
Priority to JP56152352A priority patent/JPH0134431B2/ja
Application filed by Victor Company of Japan Ltd, NIPPON VICTOR KK filed Critical Victor Company of Japan Ltd
Publication of GB2107507A publication Critical patent/GB2107507A/en
Application granted granted Critical
Publication of GB2107507B publication Critical patent/GB2107507B/en
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/92Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00Electrically-operated educational appliances
    • G09B5/06Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
    • G09B5/065Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00Head arrangements not specific to the method of recording or reproducing
    • G11B21/02Driving or moving of heads
    • G11B21/022Programmed access in sequence to indexed parts of operating record carriers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/92Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/9201Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal
    • H04N5/9205Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being at least another television signal

Abstract

A rotary recording medium 30 has different program video signals recorded for each predetermined interval on a spiral track T formed thereon, a kick control signal recorded at an end part of the predetermined level, for shifting the reproducing element to another track turn, and an audio signal recorded so that a track interval V9-a. V13-b,V17-c,V21-d-, ...including a track position immediately prior to a certain position where the reproducing element is shifted in response to the kick control signal and a track interval including a certain track position immediately after the position where the reproducing element is shifted contain the same content (eg a silent audio signal). A problem/answer arrangement is described w.r.t. Fig. 3, the selection switch in Fig. 4 (not shown) controlling the kick according to answer selected. The kick operation may be in the inner or outer direction. A five bit kick pulse signal is described w.r.t. Fig. 2A, B (not shown) coded according to whether kick is required, direction, reproducing mode, and number of kicks. Multiplexing arrangements are detailed, w.r.t. Fig. 1 (not shown), the main information signal modulating a laser light incident on photosensitive material for fabrication. An alternative embodiment incorporating two programmes is described wrt to Figs. 5-7 (not shown). Two audio channels are used. <IMAGE>

Description

SPECIFICATION Rotary recording medium The present invention generally relates to rotary recording mediums, and more particularly to a rotary recording medium from which a kick signal recorded thereon is reproduced by a reproducing element and the reproducing element is shifted (kicked) to an adjacent track to reproduce video and audio signals in a reproducing apparatus, which is recorded with the audio signal so that the reproduced sound does not become discontinuous even when the reproducing element is shifted.

A new infomation signal recording and/or reproducing system has been proposed in United State Patents No. 4,315,283 and No.

4,322,836, of which the assignee is the same as that of the present application. According to this proposed system, the recording system forms pits in accordance with an information signal being recorded along a spiral track on a flat rotary recording medium (hereinafter simply referred to as a disc), without forming a groove therein. In the reproducing system, a reproducing stylus traces over along this track to reproduce the recorded information signal in response to variation in electrostatic capacitance.

In this system since no guide grooves for guiding the reproducing stylus are provided on the disc, it becomes necessary to record pilot or reference signals on or in the vicinity of a track of a program information signal, on the disc. Upon reproduction, the reference signals are reproduced together with the program information signal. Tracking control is carried out so that the reproducing stylus accurately traces along the track in response to the reproduced reference signals.

By use of this previously proposed system, there is no possibility whatsoever of the reproducing stylus or the disc being damaged since the recording track has no groove. The reproducing stylus can trace the same portion of the track repeatedly many times, whereby a special reproduction such as still picture reproduction, slow-motion reproduction, or quickmotion reproduction becomes possible in a case where the recorded information signal is a video signal.

In order to carry out the above special reproduction, a kick pulse is produced by a special reproduction mode control circuit, and this kick pulse is applied to a tracking control coil in a signal pickup reproducing device, to shift the reproducing stylus to an adjacent track. Because the track is formed in a spiral manner, upon still picture reproduction, for example, the reproducing stylus is shifted to an adjacent track in the outer peripheral direction of the disc, once for every revolution of the disc. During slow-motion reproduction, the reproducting stylus is shifted to an adjacent track in the outer peripheral direction of the disc, once for every predetermined number of revolutions over one inclusive of the disc.

Further, upon quick-motion reproduction, the reproducing stylus is shifted to a track in the inner peripheral direction of the disc.

Accordingly, the above conventional special reproduction was performed by carrying out still picture reproduction, slow-motion reproduction, and quick-motion reproduction with respect to a part of a program continuously recorded on the tracks formed on the disc.

However, there is now a demand for recording and reproducing various information programs on the disc. Hence, it is highly desirable to realize a new special reproducing system for obtaining a special reproduction picture such as a reproduction picture obtained by composing different recorded information and a reproduction picture obtained by selecting information from among a plurality of recorded information.

Hence, the present inventor has endeavored at realizing a new disc which satisfies the above demands. That is, he has endeavored to realize a disc recorded with a kick signal at predetermined positions for shifting the reproducing element to an adjacent track, so as to suitably select different plurality of program video information recorded on each track according to the kick signal obtained during reproduction to obtain a reproduced picture.

However, in this disc, it was found that if the audio signal is recorded in a normal manner, there was a disadvantage in that discontinuity was introduced in the reproduced audio information when the program of the above program video information is selectively reproduced. That is, if the reproducing element is shifted within a vertical blanking period of the video signal recorded on the track, no inconvenient phenomenons appear in the reproduced picture obtained by the reproduced video signal due to the above shift. However, discontinuity is introduced in the audio signal.

Accordingly, it is a general object of the present invention to provide a novel and useful rotary recording medium in which the above described disadvantages have been overcome.

The present invention provides a rotary recording medium reproduced by a reproducing apparatus which has a reproducing element for reproducing recorded signals from said rotary recording medium, said rotary recording medium having, different program video signals recorded for each predetermined interval on a spiral formed thereon, a kick control signal recorded at an end part of said predetermined interval, for shifting said reproducing element to another track turn, and an audio signal recorded so that, a track interval including a track position immediately prior to a certain position where said reproducing element is shifted in response to said kick control signal and a track interval including a certain track position immediately after the position where said reproducing element is shifted, contain the same content.

Another and more specific object of the present invention is to provide a rotary record ing medium from which a kick signal recorded thereon is reproduced by a reproducing element and the reproducing element is shifted (kicked) to an adjacent track to reproduce video and audio signals in a reproducing apparatus, which is recorded with the audio signal so that the reproduced sound does not become discontinuous even when the reproducing element is shifted. According to the rotary recording medium of the present invention, identical audio information contents (including silent audio signal) are recorded on adjacent tracks for a predetermined interval of each of the tracks. The reproducing element of the reproducing apparatus is shifted to the adjacent track so as to avoid a discontinuous point of the information content of the audio signal.

Other objects and furtehr features of the present invention will be apparent from the following detailed description when read in conjunction with the accompanying drawings.

Figure 1 is a systematic block diagram showing an embodiment of a recording system for a disc according to the present invention; Figures 2A and 2B respectively show waveforms of a kick control signal recorded on the disc; Figure 3 shows a first embodiment of a track pattern on the disc according to the present invention; Figure 4 is a systematic block diagram showing an embodiment of a reproducing apparatus for reproducing the disc shown in Fig. 3; Figure 5 shows a second embodiment of a track pattern on the disc according to the present invention; Figure 6 is a systematic block diagram showing an embodiment of a reproducing apparatus for reproducing the disc shown in Fig. 5; Figure 7 is a systematic block diagram showing an embodiment of a concrete construction of a control circuit in the block system shown in Figs. 6; and Figures 8(A) through 8(E) respectively show output signal waveforms of the control circuit shown in Fig. 7.

Description will be given with respect to a block system showing an essential part of an embodiment of a recording system for recording signals on a disc according to the present invention, by referring to Fig. 1. First and second channel audio signals are independently applied to input terminals 11 and 12.

The first channel audio signal is supplied to a frequency modulator 16 wherein a first channel FM audio signal is obtained by frequencymodulating a carrier having a frequency of 3.43 MHz, for example. On the other hand, the second channel audio signal is supplied to a frequency modulator 17 wherein a second FM audio signal is obtained by frequencymodulating a carrier having a frequency of 3.73 MHz, for example. The above first and second channel FM audio signals are respectively supplied to a mixing circuit 18. A video signal applied to an input terminal 13 is gated by a gate pulse at a gate 19. This gate pulse is applied to an input terminal 14 simultaneously as a kick control which is applied to an input terminal 15 which will be described hereinafter.Accordingly, the above video signal is eliminated of the video signal recording interval beyond a color burst signal within one horizontal scanning period, and supplied to a mixing circuit 20. The mixing circuit 20 mixes the output video signal of the gate 19 and the kick control signal obtained from the input terminal 15 and inserts the kick control signal within the above eliminated video signal recording interval, and supplies the mixed video signal to the mixing circuit 18. The mixed video signal is multiplexed with the above first and second channel FM audio signals at the mixing circuit 18. Measures are taken so that the band of the video signal applied to the input terminal 13 does not overlap with the bands of the first and second channel FM audio signals.For example, the above video signal is a composite color video signal wherein a low-band-converted carrier chrominance signal is subjected to band-share-multiplexing with a high-frequency range of a luminance signal which is band-limited to an upper limit frequency of approximately 3 MHz.

The above kick control signal is a burst signal having a frequency of 500 kHz, for example, and is multiplexed with the video signal at the mixing circuit 20 as shown in Fig. 2A. The kick control signal B comprises five bits. A first bit B1 of the kick control signal B indicates whether the kick operation is to be performed. If the first bit is "1" (recorded), the kick operation is performed, and if the first bit is "0" (unrecorded), the kick operation is not performed. A second bit B2 indicates the kicking direction, and "1" indicated the outer peripheral direction of the disc, while "0" indicates the inner peripheral direction of the disc. Third and fourth bits B3 and B4 indicate the reproducing mode, and four reproducing modes can be specified by setting these bits to "00", "01", "10", and "11". Here, "00" indicates a first mode, "01" indicates a second mode, and "10" indicates a third mode. A fifth bit B5 indicates the number of kicks. If the first bit B1 is "1", "0" in this fifth bit B5 indicates one kick, and "1" in this fifth bit B5 indicates two kicks.

The kick control signal B exists between horizontal synchronizing signals HD and HD, in an interval wherein a color burst signal CB does not exist. In the example shown in Figs. 2B, the first bit B1 is "1", second bit B2 is "O", third bit B3 is "1", fourth bit B4 is "0", and fifth bit B5 is "1". This indicates that the kick is performed, the kick is towards the inner peripheral direction of the disc, the reproducing mode is the third mode, and the number of kicks is two.

The # The multiplexed signal obtained from the mixing circuit 18 is supplied to a frequency modulator 21 wherein the signal is converted into a frequency-modulated wave having a carrier deviation bandwidth of 6.1 MHz to 7.9 MHz, for example. This frequency-modulated signal is produced from an output terminal 22 as a main information signal.

The above main information signal is applied to a light modulator (not shown), for example, and converted into a modulated light beam by modulating a lazer light. The modulated light beam is focused on a photosensitive agent coating an original disc which is rotated. A main track having rows of intermittent pits are formed according to the repetition frequency of the main information signal, by a known developing process. Thus, the video signal and the two-channel audio signals are respectively and simultaneously recorded on the same main track. First and second reference signals fp1 and fp2 for tracking control, are applied to another light modulator (not shown) and similarly converted into a modulated light beam by modulating a lazer light. Hence, sub tracks having intermittent rows of pits are formed between the main tracks.The disc is manufactured from the above recorded original disc, by way of a known manufacturing process.

As shown in Fig. 3, a disc 30 manufactured in the above described manner, is recorded with the main information signal along a spiral track Tfor one revolution of the disc. Tracks of the first reference signal fpl are shown by dotted lines, while the tracks of the second reference signal fp2 are shown by one-dot chain lines. The positions of the vertical synchronizing signals of respective fields are designated by reference characters V1, V2, B3, , ~ ~, and the successive track parts corre- sponding to one revolution of the disc of a single spiral track Tare designated by track turns t1, t2, t3, ~ . Furthermore, a third reference signal fp3 is recorded at the starting end positions V1, V5, V9, ~ ~ of each of the track turns t1, t2, t3, ~ ~ , that is, at positions where the reference signals fpl and fp2 switch over.

In the interval between positions V1 and V9 (such interval will hereinafter be referred to as an interval V1-V9) on the spiral track of the disc, a program which presents a problem and supplies answers X, Y, and Zfrom which one answer is to be selected, for example, is recorded. A program for giving commentary on the answer when the answer Xis selected, is recorded in intervals V9-V13 and V21-V25 in accordance with the above program. Similarly, programs for giving commentary on the answer when the answers Y and Z are selected, are respectively recorded in intervals V13-V17 and V25-V29 and intervals V17-V21 and V29-V33. A program for presenting a succeeding poblem, is continuously recorded towards the inner periphery of the disc from the position V33.A kick control signal containing information "10101" as shown in Fig. 2B for specifying two kicks towards the inner periphery of the disc in the third mode, is recorded at the position V9. In addition, a kick control signal containing information "10010" for specifying one kick towards the inner periphery of the disc in the second mode, is recorded at a position p.

Similarly, kick control signals for specifying two kicks towards the inner periphery of the disc in the first mode, second mode, third mode, and first mode, respectively, are recorded at the positions V13, V17, V21, and V25. In addition, a kick signal for specifying one kick towards the inner periphery of the disc in the second mode is recorded at the position V29.

The audio signal is continuous for each program. And, during an interval in which the reproducing stylus is shifted (kicked) to an adjacent track, at an interval immediately after the position V9 where the kick is performed by the kick control signal recorded at the position V9, for example, it is essential that the audio signal does not become discontinuous. Accordingly, in the present invention, the same audio signal or silent audio signal (that is, the audio signal is not recorded) is recorded in intervals V9-a and V17-c. Moreover, in accordance with the mode with which the kick is performed by the kick control signal recorded at the position p, the same audio signal as that recorded in the interval V9-a or silent audio signal is recorded in an interval V13-b, so that no discontinuity is introduced between the intervals V9-a and V13-d.Furthermore, for similar reasons, intervals V9-a, V13-b. V17-c, V21 -d, V25-e, V29-f, V33-g, ~ ~ are all silent, for example.

Description will now be given with respect to an embodiment of a reproducing apparatus for reproducing the disc 30 shown in Fig. 3, by referring to Fig. 4. The disc 30 is placed onto a turntable 31 and rotated by a motor 32 at a rotational speed of 900 rpm, for example. A signal pickup device 33, used as a reproducing transducer, has a reproducing stylus 34, and moves continuously and linearly in a direction from the outer peripheral part to the inner peripheral part of the disc at a speed equal to the distance of one track pitch per revolution of the turntable 31, during a forward normal reproduction mode. Accordingly, the reproducing stylus 34 of the signal pickup device 33 moves radially across the rotating disc 30 and relatively scans over the spiral track on the disc 30.

A reproduced signal picked up from the disc 30 as minute variations in the electrostatic capacitance by the reproducing stylus 34 of the signal pickup device 33, is supplied to a preamplifier 35 having a resonant circuit.

The resonance frequency of the resonant circuit varies in response to this variation in the electrostatic capacitance, and is formed into a signal of a desired level. The resulting output of the preamplifier 35 is demodulated into the original main information signal by a demodulator 36 and is obtained as an output through an output terminal 37.

The output signal of the preamplifier 35 is supplied to a lowpass filter 38 wherein the reference signals fp1, fp2, and fp3 are separated. The output reference signals pass through an automatic gain control circuit 39, and are respectively supplied to amplifiers 40, 41, and 42. Here, each of the amplifiers 40, 41, and 42 is a kind of a bandpass amplifier respectively designed to have steep passing frequency characteristics at only the respective frequency fp1, fp2, and fp3. As a result, the signals having frequencies fp1 and fp2 are respectively separated and obtained from the amplifiers 40 and 41. These signals respectively pass through level adjustors 43 and 44, wherein the levels of the signals are adjusted.

The resulting signals are then supplied to a gate switching circuit 45. The reference signal fp3 separated and amplified at this bandpass amplifier 42, is supplied to a switching signal generator 46.

The gate switching circuit 45 performs switching of the reference signals fp1 and fp2 every one revolution period of the disc 30 upon normal reproduction, in response to the switching signal generated by the switching signal generator 46 which is applied thereto.

Hence, due to the switching signal which reverses polarity every 1/15 seconds, the signals fp1 and fp2 are always alternately supplied to detecting circuits 47 and 48 from the gate switching circuit 45.

The detecting circuits 47 and 48 detect the envelopes of their respective input reference signals, and convert the input reference signals into DC voltages. These DC voltages are then supplied to a differential amplifier 49.

The differential amplifier 49 compares the output signals of the two detecting circuits 47 and 48 which vary in response to the reproduced levels of the reference signals fpl and fp2, and generates an output tracking error signal which indicates the direction of the tracking error and the error quantity. This tracking error signal is amplified to a specific level by a driving amplifier 50.

The output signal of the driving amplifier 50 is applied to tracking coils of the signal pickup device 33 as a control signal, to control these tracking coils. Hence, tracking control is carried out with respect to the reproducing stylus 34 so that the above tracking error signal becomes zero, that is, so that the reproducing stylus 34 accurately scans over the track Ton the disc 30.

The output of the demodulator 36 is supplied to a kick control signal detector 51 wherein the kick control signal demodulated together with the video signal is detected. The detected kick control signal is supplied to a selection switch 52. The selection switch 52 passes and supplies a predetermined kind of kick control signal to a kick pulse generator 54 from among control signals obtained from one detector 51, according to a setting at the selection switch 52 made by a setting signal from a terminal 53. The kick pulse generator 54 generates a kick pulse for performing a kick operation in the inner peripheral direction or the outer peripheral direction of the disc, according to the kind of kick control signal obtained through the selection switch 52. The generated kick pulse is supplied to the tracking control coils of the signal pickup device 33, through the driving amplifier 50.Hence, the reproducing stylus 34 is kicked towards the inner peripheral direction or the outer peripheral direction of the disc and thus shifted to an adjacent track. In addition, the kick pulse from the kick pulse generator 54 is also supplied to the switching signal generator 46, so that a switching signal is generated and supplied to the gate switching circuit 45.

When the disc 30 shown in Fig. 3 is reproduced by the reproducing apparatus shown in Fig. 4, the operator solves the problem presented while reproducing the interval V1 -V9. If the operator wishes to select the answer Xas the answer for this problem, for example, a moving contact of the switch 52 is connected to a contact 52a to select the above first mode. The reproducing stylus 34 reproduces the recorded information (the information content is a poblem) in the interval V1-V9, and begins to scan over the track t3 without being kicked at the position V9.

Thereafter, the reproducing stylus 34 scans over the interval V9-V13 and reproduces the commentary of the answer X. After scanning over the interval V9-V1 3, the reproducing stylus 34 is kicked twice at the position V13, and then scans over the interval V21-V25, to continue reproducing the commentary on the answer X. The reproducing stylus 34 is kicked twice at the position V25 and reaches the position V33, to start reproducing the next problem therefrom. Here, the reproducing stylus 34 is kicked twice at the positions V13 and V25, and is shifted to positions slightly beyond the position V21 and V33.However, because the intervals V13-b and V21-d are respectively recorded with the same audio signal or silent, and the intervals V25-e and V33-g are similarly recorded with the same audio signal or silent, as described above, discontinuity is not introduced in the reproduced audio signal content during the above shifting of the reproducing stylus 34.

When selecting the answer Y, the movable contact of the switch 52 is connected to a contact 52b, to select the above second mode. In this case, the reproducing stylus 34 is kicked once at the position p after reproducing the problem in the interval V1-V9, and scans over the interval V13-V17 to reproduce the commentary on the answer Y. After reproducing the interval V13-V17, the reproducing stylus 34 is kicked twice at the position V17, and thereafter continues to reproduce the commentary on the answer Yby scanning over the interval V25-V29. The reproducing stylus 34 is kicked once at the position V29 to reach the position V33, and starts reproducing the next problem therefrom.Here, the reproducing stylus 34 is kicked once at the positions p and V29 and twice at the position V1 7. However, because the intervals V9-a and V13-b are recorded with the same audio signal or silent, the intervals V1 7-c and V25-e are recorded with the same audio signal or silent, and the intervals V29-f and V33-g are recorded with the same audio signal or silent, discontuinity is not introduced in the reproduced audio signal content during the shifting of the reproducing stylus 34.

When selecting the answer Z, the movable contact of the switch 52 is connected to a contact 52c, to select the above third mode.

In this case, the reproducing stylus 34 is kicked twice at the position V9 after reproducing the problem in the interval V1--V9, and scans over the interval V17-V21 to reproduce the commentary on the answer Z. After reproducing the interval V17-V21, the reproducing stylus 34 is kicked twice at the position V21, and thereafter continues to reproduce the commentary on the answer Zby scanning over the interval V29-V33. The reproducing stylus 34 then reaches the position V33, and starts reproducing the next problem therefrom. Here, the reproducing stylus 34 is kicked twice at the positions V9 and V21.

However, because the intervals V9-a and V17-c are recorded with the same audio signal or silent, and the intervals V21-d and V29-f are recorded with the same audio signal or silent, discontinuity is not introduced in the reproduced audio signal content during the shifting of the reproducing stylus 34.

Next, description will be given with respect to a second embodiment of the disc according to the present invention, by referring to Fig.

5. In Fig. 5, those parts which are the same as those corresponding parts in Fig. 3 are designated by the same reference numerals, and their description will be omitted. In a disc 60, a video signal of a first program is recorded in an interval V1-V3, that is from the position V1 reaching the position V3 on the track ti. A video signal of a second program having a content different from the first program, is recorded in an interval V3-V7. Similarly, the first program is recorded in intervals V7-V1 1. V1 5-Vi 9, V23-V27, , ~, and the second program is recorded in the intervals V11-V15, V19-V23, . .Accordingly, the first program video signal is reproduced in the order of the intervals V1-V3,V7-V11, V 15-V 9, and becomes continuous. Similarly, the second program video signal is reproduced in the order of the intervals V3-V7, V11-V15, V19-V23, and becomes continuous.

With respect to the audio signals, the audio signals are recorded as follow. First, the first channel audio signal is recorded in the following manner. The first channel audio signal having a content corresponding to the first program video signal in the intervals V1-V3 and V7-k, is recorded in an interval V1-j extending to a position j 1.5 fields beyond the position V5 from the position V1, through positions i and V3 through V6. The first channel audio signal having a content corresponding to the first program video sidnal in intervals i-V3 and V7-k, that is, the same audio signal as that in an interval i-j, is recorded in an interval j-k. Accordingly, the content of the first channel audio signal is discontinuous at the position j.An audio signal corresponding to the video signal content in intervals k-V11 and V15-m and is continuous with the audio signal in the interval j-k at the position k, is in recorded in an interval k. 1. An audio signal which is the same as that recorded in the interval k-i, is recorded in an interval l-m, and the content is discontinuous at the position 1. In addition, an audio signal which is continuous with the audio signal recorded in the interval l-m at the position m, is recorded in an interval m-n. An audio signal which is the same as that recorded in the interval m-n, is recorded in an interval n-o.

The second channel audio signal is recorded in the following manner. The second channel audio signal corresponding to the content of the second program video signal is recorded in the interval V3-V7. An audio signal which is the same as the audio signal corresponding to the video signal in the interval V11-1, is recorded in an interval V7-k.

Similarly, the audio signal recorded in the interval k-i is the same as the audio signal recorded in an interval j-k. In addition, the audio signals recorded in the intervals k-l and I-k correspond to the video signals recorded in the intervals l-V15 and V19-n. The second channel audio signal is discontinuous at the position k and m.

An embodiment of a reproducing apparatus for reproducing the above disc 60, is shown in Fig. 6. In Fig. 6, those parts which are the same as those corresponding parts in Fig. 4 are designated by the same reference numerals, and their description will be omitted.

The first and second channel audio signals obtained from the demodulator 36, are respectively supplied to contacts 61 a and 61 b of a switch 61. A movable contact of the switch 61 is switched and connected to one of the contacts, according to a mode specifying signal applied to an input terminal 62.

That is, if the signal from the input terminal 62 is a first mode specifying signal, the movable contact of the switch 61 is connected to the contact 61 a. On the other hand, if the signal from the input terminal 62 is a second mode specifying signal, the movable contact of the switch 61 is connected to the contact 61 b. The first or the second channel audio signal which is selectively passed through the switch 61, is obtained from an output terminal 63.

A mode specifying signal identical to that applied to the input terminal 62, is applied to a control circuit 64 from an input terminal 65.

If the program video signal which is to be selected is the first program, signal, the first mode specifying signal is applied to the input terminal 65. On the other hand, if the program video signal which is to be selected is the second program signal, the second mode specifying signal is applied to the input terminal 65.

For example, the control circuit 64 has a circuit construction shown in Fig. 7. An oscillation output of an oscillator 70 is applied to a counter 71 as a clock pulse. The counter 71 is also applied with the third reference signal fp3 from the amplifier 42 as a reset signal, through a terminal 72. An output of the counter 71 is supplied to a decoder 73.

Signals P and Q respectively shown in Figs.

8(A) and 8(B) which are obtained from the decoder 73, are applied to a contact q of a switch 74. Inverted signals P and Q respectively shown in Figs. 8(D) and 8(E) which are obtained by inverting the signals PAnd Oat inverters 75a and 75b, are supplied to a contact r of the switch 74. A movable contact of the switch 74 is switched over and connected to the contact q or r according to the first or the second mode specified by the mode specifying signal from the terminal 65.

The signals P and 0 are obtained at output terminals 76a and 76b during the first mode, and the signals P and Q are obtained at the output terminals 76a and 76b during the second mode. The above signals obtained at the output terminals 76a and 76b are respectively supplied to the gate switching circuit as gate switching signals. In addition, a signal R shown in Fig. 8(C) is obtained from the decoder 73 and produced through an output terminal 76c. This signal R is supplied to the kick pulse generator 54 which generates a kick pulse for shifting the reproducing stylus 34 by one track pitch.

When reproducing the first program video signal and the first channel audio signal corresponding to this first program video signal, the first mode specifying signal is applied to the input terminals 62 and 65. In this state, the reproducing stylus 34 reproduces the recorded information in the interval V1-V3, and is kicked once at the position V3. Thereafter, the reproducing stylus 34 scans over the interval V7-V11 and is kicked once at the position V11. The reproducing stylus 34 then scans over the interval V1 5-V19 and is kicked once at the position V19. The scanning by the reproducing stylus 34 is continued similarly thereafter. As a result, the intervals V1-V3,V7-V11,V15-V19, are continuously reproduced.The first program video signal is obtained from the output terminal 37, and the first channel audio signal corresponding to the above first program video signal is obtained from the output terminal 63. The reproducing stylus 34 is kicked once and shifted at the positions V3, V11, V19, However, as described above, the first channel audio signal recorded in the interval i-j is the same as the audio signa; recorded in the interval j-k. Similarly, the audio signals recorded in the intervals k-l and l-m are the same, and the audio signals recorded in the intervals m-n and n-o are the same. Accordingly, discontinuity is not introduced in the reproduced audio signal content when the reproducing stylus 34 is shifted.

On the other hand, when reproducing the second program video signal and the second channel audio signal corresponding to the second program video signal, the second mode specifying signal is applied to the input terminals 62 and 65. The reproducing stylus 34 reproduces the recorded information in the interval V3-V7, and is kicked once at the position V7. Thereafter, the reproducing stylus 34 scans over the interval V11-V15 and is kicked once at the position V15. The reproducing stylus 34 then scans over the interval V19-V23 and is kicked once at the position V23. The scanning by the reproducing stylus 34 is continued similarly thereafter. As a result, the intervals V3-V7, V11-V15, V19-V23, ~ ~ are continuously reproduced.

The second program video signal is obtained from the output terminal 37, and the second channel audio signal corresponding to the above second program video signal is obtained from the output terminal 63. The reproducing stylus 34 is kicked once and shifted at the positions V7, V15, V23, ~ ~ However, as described above, the second channel audio signa' recorded in the interval j-k is the same as lhe audio signal recorded in the interval k-l. Similarly, the audio signals recorded in the intervals l-m and m-n are the same, and the audio signals recorded in the interval n-o and the continuing interval of one revolution of the disc 60 are the same. Ac cordingly, discontinuity is not introduced in the reproduced audio signal content when the reproducing stylus 34 is shifted.

Further, the present invention is not limited to these embodiments, but various variations and modifications may be made without departing from the scope of the present invention.

Claims (5)

1. A rotary recording medium reproduced by a reproducing apparatus which has a reproducing element for reproducing recorded signals from said rotary recording medium, said rotary recording medium having: different program video signals recorded for each predetermined interval on a spiral track formed thereon; a kick control signal recorded at an end part of said predetermined interval, for shifting said reproducing element to another track turn; and an audio signal recorded so that, a track interval including a track position immediately prior to a certain position where said reproducing element is shifted in response to said kick control signal and a track interval including a certain track position immediately after the position where said reproducing element is shifted, contain the same content.
2. A rotary recording medium as claimed in claim 1 in which the audio signal of said same content recorded in said track intervals is a silent audio signal.
3. A rotary recording medium as claimed in claim 1 in which said audio signal comprises different channels of audio signals corresponding to said video signal programs, and said kick control signal is recorded at positions on each track turn of said spiral track so that said reproducing element is shifted avoiding positions where contents of the audio signals of each channel become discontinuous if these contents are reproduced continuously.
4. A rotary recording medium as claimed in claim 1 in which said kick control signal comprises mode information which determines which program video signal is to be selectively reproduced by the shifting of said reproducing element.
5. A rotary recording medium as claimed in claim 4 in which said kick control signal further comprises information indicating the number of times said reproducing element is to be shifted.
GB08227116A 1981-09-25 1982-09-23 Rotary recording medium Expired GB2107507B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56151606A JPS6327780B2 (en) 1981-09-25 1981-09-25
JP56152352A JPH0134431B2 (en) 1981-09-26 1981-09-26

Publications (2)

Publication Number Publication Date
GB2107507A true GB2107507A (en) 1983-04-27
GB2107507B GB2107507B (en) 1985-12-11

Family

ID=26480802

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08227116A Expired GB2107507B (en) 1981-09-25 1982-09-23 Rotary recording medium

Country Status (4)

Country Link
DE (1) DE3235496C2 (en)
FR (1) FR2513789B1 (en)
GB (1) GB2107507B (en)
NL (1) NL8203715A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140958A (en) * 1983-05-31 1984-12-05 Victor Company Of Japan Rotary recording medium and reproducing apparatus therefor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968692A (en) * 1956-10-08 1961-01-17 Ampex Electronic switching system for magnetic recorder and/or reproducer
US3476469A (en) * 1967-02-06 1969-11-04 Panopix Research Inc Motion picture film
DE2344125C2 (en) * 1973-04-11 1984-01-26 Ted Bildplatten Ag Aeg-Telefunken-Teldec, 6301 Zug, Ch
US4331976A (en) * 1976-04-08 1982-05-25 Victor Company Of Japan, Ltd. High density recording system using side-by-side information and servo tracks
NL7908476A (en) * 1979-11-21 1981-06-16 Philips Nv Device for interactive image view.
JPS5812486A (en) * 1981-07-15 1983-01-24 Victor Co Of Japan Ltd Information signal recording disk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140958A (en) * 1983-05-31 1984-12-05 Victor Company Of Japan Rotary recording medium and reproducing apparatus therefor
US4563709A (en) * 1983-05-31 1986-01-07 Victor Company Of Japan, Ltd. Rotary record having a spiral track with a video signal and two audio signals recorded thereon

Also Published As

Publication number Publication date
FR2513789B1 (en) 1986-03-07
NL8203715A (en) 1983-04-18
GB2107507B (en) 1985-12-11
FR2513789A1 (en) 1983-04-01
DE3235496A1 (en) 1983-04-21
DE3235496C2 (en) 1984-09-20

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