JPS6342477B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information signal recording disk, and when video signals of multiple fields per rotation are recorded together with audio signals, the video signals of the same field are recorded multiple times per rotation period. It is recorded repeatedly, and audio signals are recorded in a predetermined sequence, and as a general rule, a track change address signal is provided at one location for each rotation to instruct whether or not to forcibly change the track of the pick-up playback element and in which direction. (hereinafter referred to as "key address signal"), information signal recording allows selective reproduction of complete still images, complete normal reproduction images and normal reproduction audio by track reproduction every three tracks. The purpose is to provide discs.

Conventionally, when obtaining a still image from an information signal recording disk (hereinafter referred to as a "disk") in which a video signal and an audio signal are recorded on the same spiral track, one track formed for one rotation of the disk is used. It is known that this can be done by repeatedly reproducing. However, on a disk where video and audio signals are recorded in a plurality of fields, for example at a rate of 4 fields, on a track formed per revolution of the disk, the video signals of 4 fields are repeatedly played back by the above still image playback. Therefore, when this video signal is a moving image, the reproduced image is not a completely still image and has some jitter, and the faster the video signal is for an image, the still image does not look static and the reproduced image looks younger. It was hot.

On the other hand, when playing back a still image from a disc where the same video signal is recorded four times as a 4-field video signal recorded on a track formed per revolution of the disc, the same field (or the same frame) ) video signal is played repeatedly, so it is possible to obtain a completely still image, but on the other hand,
When conventional normal playback is performed without forcibly changing the track of the pick-up playback element, if the disc is recorded with 3/4 of the image information dropped, the movement of the playback image becomes awkward, and the image information is also dropped. In the case of a disc recorded without recording, the reproduced image looks like a slow motion image, and it is not possible to obtain a normal reproduced image or normal reproduced sound.

The present invention eliminates the above-mentioned drawbacks, and each embodiment thereof will be described below with reference to the drawings.

The present invention relates to a disk in which a video signal and an audio signal are recorded on the same track at a rate of multiple fields per revolution, and will be explained using, as an example, a case in which the present invention is applied to a disk previously proposed by the applicant. do. In the disk proposed by the present applicant, the main information signal is recorded on a spiral main track without forming a needle guide groove, and the main information signal is recorded on a spiral main track at a frequency lower than the recording frequency band of the main information signal. First and second tracking control reference signals (hereinafter referred to as "tracking signals") _p1 and _p2 that have different frequencies and are in the form of a burst
are recorded by forming a sub-track approximately in the middle between the track center lines of adjacent main tracks that are alternately switched every rotation period of the disk, and furthermore, a sub-track is recorded at the switching connection part of _p1 and _p2 . is a disk having an electrode function in which the third tracking signal _p3 is recorded on the main or sub-track at a level below a predetermined level so as not to affect the main information signal.

Here, a description will be given of an example of a capacitance change detection/reading type disk in which video signals and audio signals as the main information signals are recorded as a series of pits that are intermittent at a rate of four fields per rotation. FIG. 1 is a diagram schematically showing the recording arrangement relationship of the recording tracking signals of the disk proposed by the applicant, and in the figure, the ○ mark indicates the tracking signal _p1.
Recording positions, the x marks indicate the recording positions of the tracking signal _p2 , the solid lines indicate the track center line of the main track, and a, b, c, and d indicate the vertical blanking period recording portions, which are further indicated by diagonal lines. A tracking signal _p3 is recorded in the vertical blanking period recording portion a.

FIG. 2 shows a block system diagram of an embodiment of the main part of the disk recording system according to the present invention. In the same figure, 1
and 2 are audio signal sources, and audio signals to be recorded on the disk are reproduced by, for example, a tape recorder. These audio signal sources 1 and 2 are arranged in advance in a predetermined order for each field so that the audio signals are arranged in a chronological order in a predetermined order for each field unit, and the audio signal portions are recorded in correspondence with the still image recording portions of the video signals, which will be described later. The synthesized audio signals are output to frequency modulators 3 and 4, respectively. The frequency modulator 3 outputs the input audio signal as a first audio frequency modulated wave of, for example, 3.43MHz±75kHz to the mixer 5, and the frequency modulator 4 outputs the input audio signal as a first audio frequency modulated wave of, for example, 3.73MHz±75kHz. Output to mixer 5.

On the other hand, 6 is a color video signal source from which an NTSC, PAL, or SECAM color video signal reproduced by, for example, a magnetic recording/reproducing device is extracted and supplied to a luminance signal processing circuit 7, where the luminance signal is While the upper limit frequency is limited, it is supplied to a carrier color signal processing circuit 8, where the carrier color signal is separated and converted to a lower frequency. The luminance signal taken out from the brightness signal processing circuit 7 and the low-pass converted carrier color signal taken out from the carrier color signal processing circuit 8 are each subjected to, for example, band sharing multiplexing in a mixer 9, and then supplied to the mixer 5. Ru.

Furthermore, 10 is an address signal generation circuit which generates a chapter address signal, a time address signal, and a kick address signal to be described later in a predetermined manner corresponding to the vertical blanking period of the luminance signal taken out from the luminance signal processing circuit 7. Output in order. A _K1 and A _K2 shown in FIG. 3D indicate address signals for kick.
The chapter address signal, the time address signal, or the kick address signal is supplied to the mixer 5. Further, the tracking signal generator 11 is supplied with the luminance signal from the luminance signal processing circuit 7 and the low-pass converted carrier color signal from the carrier color signal processing circuit 8, and separates the subcarrier frequency of the low-pass converted carrier color signal. the first, second and third tracking signals _p1 , which have the same frequency and different frequencies;
Generate _p2 and _p3 at predetermined timing. Here, the tracking signals _p1 and _p2 are band-sharing multiplexed signals (see FIG. 3A) of the luminance signal and low-frequency conversion carrier chrominance signal output from the mixer 9, as shown in FIG. 3B.
This is a burst-like signal that is output only within the horizontal blanking period (shown in Figure 1) and during the period in which the color burst signal is avoided so as not to adversely affect the color burst signal, and is tracked every disk rotation period. The signals _p1 and _p2 are alternately output to the output terminal 12,
The output signal is switched to 13.

The waveform of the modified color video signal to be recorded, which is the output of the mixer 9, is shown in FIG. Numbers C _b1 to C _b7 indicate color burst signals. Also, a third tracking signal
As shown in FIG. 3C, _p3 is generated for one rotation of the disk and is outputted to the output terminal 15 over a period of about 3H corresponding to the vertical synchronizing pulse period of the modified color video signal recorded in FIG.

The modified color video signal to be recorded by the mixer 5, first and second audio frequency modulated waves occupying vacant frequency bands higher than this, a chapter address signal, and a time address. The kick address signal A _K1 , (or A _K2 ,
A _K3 , A _K4 ) are mixed and multiplexed, respectively.
This mixed multiplexed signal is supplied to a frequency modulator 14, where it is frequency modulated, and then sent from an output terminal 15 as a main information signal to a recording optical system (not shown) as a first and second signal from output terminals 12 and 13. It is output together with tracking signals _p1 and _p2 . Note that the carrier wave shift frequency band of the luminance signal of the output frequency modulated wave of the frequency modulator 14 is, for example, when reproducing as an NTSC color video signal, the sync chip level is 6.1 MHz, the pedestal level is 6.6 MHz,
The white peak is 7.9MHz.

The above main information signal is applied to, for example, an optical modulator (not shown) to modulate a laser beam and convert it into a modulated light beam, which is applied onto a synchronously rotating disc-shaped recording master (not shown). The light is focused on the photosensitive material, and is subjected to a well-known development process to form a main track in the form of a series of pits that are intermittent in accordance with the repetition frequency of the main information signal. Therefore, the video signal and the audio signal are recorded simultaneously on the same main track. Note that the tracking signals _p1 and _p2 are applied to a different optical modulator (not shown), which similarly modulates the laser light and converts it into a modulated light beam, and then outputs the tracking signals p1 and p2 to the sub-modulator of the intermittent pit row. A track is formed at the same time as the main track. A disk having a track pattern as shown in FIG. 1 is reproduced from the above-mentioned recording master through a well-known disk manufacturing process.

Next, one embodiment of the track pattern of the disk according to the present invention will be described in more detail.

FIG. 4 shows a schematic diagram of a track pattern of an embodiment of the disk according to the present invention. In the figure, the spiral broken line indicates the track center line of the main track for recording the main information signal, and the illustration of the sub-track for recording the tracking signals _p1 and _p2 is omitted. Also a, b, c
and d indicate the recorded portion of the vertical blanking period recorded on the main track, as in FIG. The signal _p3 and the kick address signal A _K1 , A _K2 , A _K3 or A _K4 are respectively time-division multiplexed and recorded. The present invention is characterized in that the kick address signals A _K1 , A _K2 , A _K3 , or A _K4 are respectively recorded, and the details thereof will be described later.

Further, in FIG. 4, the alpha alphabet indicates the color video signal of one field period in the standard color video signal from the color video signal source 6, and the order of the alpha alphabet indicates the order of the fields. Therefore, as shown in FIG. 4, the color video signal of the same field is formed on a main track (hereinafter also referred to as "one track") that is formed for one rotation of the disk starting from the vertical blanking period recording section a. (note that one field of color video signals is recorded during a period of 1/4 rotation of the disk). Furthermore, color video signals are sequentially recorded on each track from the outer circumferential side to the inner circumferential side of the disk without dropping any image information.

Furthermore, in Fig. 4, the number written next to the alpha value indicates the audio signal to be recorded as 1 or
The division order of the divided audio signal portions obtained by dividing every two field periods is shown, and the illustrated position of the number indicates the recording range of the divided audio signal portion in that division order.
Therefore, when the tracks are played back in numerical order, a normally played audio signal is obtained. In the embodiment shown in FIG. 4, the audio signal starts recording from the vertical blanking period recording portion a, is normally recorded for 3.5 field periods, and then starts from the position where 3.5 field periods have elapsed from the first recording position. After the divided audio signal part "1" of 0.5 field period previously recorded in the rotation period of angle α (here α = 45° and 0.5 field period) is recorded twice, 3 field periods from "2" After the normal recording is repeated for a total of four tracks, the divided audio signal portion "5" of one field period is normally recorded from that position over four field periods. Hereinafter, the divided audio signal portions divided for each field period are normally recorded over 4 field periods, and then the divided audio signal portions recorded one track ago are again normally recorded over 4 field periods. is repeated every 4 tracks. Therefore, as shown in FIG. 4, the discontinuous point of the audio signal is at an angle (α+β+
γ+δ) rotated position (i.e. here α=
45°, β = γ = δ = 90°, and the position after 3.5 field periods has passed), and the pattern is repeated such that it exists every three tracks and then one track does not exist. In addition, in FIG. 4, the angle ε is 45°. Further, "1'" in the vertical blanking period recording portion a of each of the second to fourth tracks from the first track is silent.

Furthermore, in FIG. 4, the white square marks in the vertical blanking period recording portions b, c, and d on the main track indicate that the chapter address signal A _C and the time address signal A _T are recorded, respectively. show. Fifth
Figure A schematically shows the structure of a total 29-bit chapter address signal _AC , which mainly indicates the order of recording programs on the same recording surface of a disk.
A 4-bit synchronization code 16 indicated by SYNC, a 2-bit line identification code 17, a 2-bit voice identification code 18, an 8-bit chapter number identification code 19, a 12-bit time identification code 20, and a 1-bit parity bit 21. Become. When the recorded video signal is in the NTSC format, this chapter address signal A _C is used for each horizontal scanning period of horizontal scanning line numbers 17 and 280 (that is, for each of the odd and even fields, the equalization pulse after the vertical synchronization pulse is used). After, 8
The horizontal synchronizing signal is transmitted in a superimposed manner during one horizontal scanning period (from the time when the horizontal synchronizing signal is received).

The synchronization code 16 is 2, which indicates the value "C" in hexadecimal notation.
The base number is "1100", the line identification code 17 is a code that identifies the transmission line of the address signal A _C for the chapter, and the audio identification code 18 is a code that identifies the type of recording audio signal (for example, stereo, monaural,
This is a code indicating whether the person is bilingual, etc.). Furthermore, the chapter number identification code 19 is a code indicating the order of recording programs, and can indicate chapter numbers up to 99, for example. Also time identification code 2
0 is a code that indicates the track position from the initial position of each head of the recording program of each chapter number indicated by the chapter number identification code 19 in seconds, and is called a local address, and can range from 0 seconds to a maximum of 4095 seconds.
It can be expressed up to (=2 ¹² -1) seconds.

On the other hand, FIG. 5B schematically shows the structure of a total 29-bit time address signal A _T that mainly indicates the track position by the time from the initial position of the first recorded program in the program recording section of the disk. It consists of a 4-bit synchronization code 22, a 2-bit line audio identification code 23, a 2-bit audio identification code 24, a 16-bit time identification code 25, a 4-bit track identification code 26, and a 1-bit parity bit 27. This time address signal A _T is transmitted during one horizontal scanning period (horizontal scanning line number 1) following the transmission period of the chapter address signal A _C.
8,281). Line identification code 2
3 indicates this transmission period, and the synchronization code 22 and voice identification code 24 are respectively synchronization code 1.
6 and voice identification code 18 have the same content. Further, the time identification code 25 indicates the time during normal playback from the first recording position of all recorded programs, and can indicate from 0 minutes 0 seconds to a maximum of 59 minutes 59 seconds. However, in this embodiment, as will be described later, the track is played back every three tracks, so the maximum length is 14 minutes and 59 seconds. The track identification code 26 is a code for identifying the number of the track played in one second. For example, for a disc that has to play back a video signal with a field frequency of 60Hz along with an audio signal,
This is because playback is performed by making 15 revolutions per second, so it is necessary to identify which track out of the 15 tracks is being played back in the same second. However, in this embodiment, as will be described later, the track identification code 26 is played back every third track, so the track identification code 26 is set to the same value for four adjacent tracks, increases by 1 for every four tracks, and the number of disk rotations increases. At 900 rpm, 0 to every 60 tracks
It takes a value of 14, and at 750 rpm it becomes 0 at 48 tracks.
~11, the next 52 tracks take values from 0 to 12.

The configurations of the above-mentioned chapter address signal A _C and time address signal A _T were each proposed by the present applicant, but these address signals
Among the four vertical blanking periods in which A _C and A _T are recorded for one rotation of the disk, the third tracking signal _p3 is recorded, as shown by the white square marks in b, c, and d in Fig. 4. The data is recorded within the three vertical blanking periods that are not recorded.

Furthermore, in FIG. 4, black square marks, black circles, etc. in the vertical blanking period recording portion a indicate that the kick address signal _AK is recorded at that position. This pick address signal A _K has a configuration as shown in FIG.
A _K1 , A _K2 , A K3 and A _K3 as shown in FIG.
There are four types of A _K4 , and these are the address signals
Instead of A _C and _AT , the third tracking signal _p3 is transmitted at four track cycles as shown in FIG. 4. It is recorded repeatedly in two horizontal scanning periods within the vertical blanking period (for example, , when recording an NTSC color video signal, it is recorded in two horizontal scanning periods with horizontal scanning numbers 17 and 18, as shown in FIGS. 3A and 3D).

The address signal A _K for kick is as shown in Figure 6.
Consists of a total of 29 bits, including a 4-bit synchronization code 2
8, a 2-bit line identification code 29, a 2-bit audio identification code 30, a disk identification code in which the upper 4 bits of the 8 bits are 31a and the lower 4 bits are 31b, a 4-bit kick presence/absence instruction code 32, 4-bit track direction code 33, 4-bit track number code 34 and 1
The parity of the bits is 35. The synchronization code 28 has the same value ("C" in hexadecimal notation) as each of the synchronization codes 16 and 22 of the address signals A _C and _AT . Also, disk identification codes 31a and 31b
is a code for identifying that the disk has a track pattern as shown in Fig. 4, and the track address signals A _K1 , A _K2 , A _K3 , A _K4 as shown in Fig. 7 A to D, respectively. None of these are 16
Takes the value of base ``A''. Furthermore, the kick presence/absence instruction code 32 causes the playback element to forcibly change the track by one track pitch (hereinafter referred to as "kick").
) is performed within the vertical blanking period. When the bit value is "1", the trigger is "present", and when the bit value is "0", the trigger is "absent".
Further, each of the four bits indicates the presence or absence of a kick at the positions b, c, d, and a of the vertical blanking period recording portions in order from the MSB to the LSB.

Furthermore, the hard direction instruction code 33 is a code that indicates the hard direction, and each of the 4 bits is
Indicates the kick direction at the vertical blanking period recording portions b, c, d, a in order from MSB to LBS direction, and when the bit value is "1", the forward direction (inner direction in this case), " When it is "0", it instructs a kick in the opposite direction (in this case, toward the outer circumferential direction), and when the value of the corresponding bit of the kick presence/absence instruction code 32 is "0", it is set as "0". Additionally, track number code 3
4 is "0" to "3" in hexadecimal notation depending on the tight condition.
As will be described later, it is played every 3rd track (every 4th track), so the 7th
As shown in Figures A to D, the address signal A _K1 recorded on the track to be played back normally is "0", and then sequentially "1", "2", "2", etc. for each track.
The value is set to "3".

7A to 7D show hexadecimal values of the respective codes of the kick address signals A _K1 , A _K2 , A _K3 and A _K4 recorded on the disk according to the present invention, respectively. In FIGS. 7A to 7D, the values of the synchronization codes 28 of the address signals A _K1 to _{A K4} are all "C", which is the same value as the synchronization codes 16 and 22 of the address signals A _C and _AT . There is. Also, the 4-bit value made up of the line identification code 29 and voice identification code 30 is:
The horizontal scanning line number 17 recorded within one horizontal scanning period is "C", and the horizontal scanning line number 18 recorded within one horizontal scanning period is "8". Next, we will explain the values and contents of the kick presence/absence instruction code 32 and the kick direction instruction code 33.First, the value of the kick address signal A _K1 is as shown in FIG. ” value. The value of "E" in hexadecimal is "1110" in binary, and the three bits excluding the LSB are "1", so the three vertical blanking lines excluding the vertical blanking period recording part a on the track It is shown that there is a kick in the forward direction at each position of the erase period recorded portions b, c, and d. Also address signal for kick
As shown in Figure 7B, the values of codes 32 and 33 of A _K2 are both the hexadecimal value "6", that is, the 4-bit binary number "0110", and the vertical blanking period is It shows a forward kick at each position of recorded portions c and d.

Similarly, the values of the above codes 32 and 33 of the kick address signals A _K3 and A _K4 are shown in Fig. 7 C and D.
As shown in , they are "2" and "0" in hexadecimal notation, respectively, and the kick address signal A _K3 indicates that the kick is to be kicked in the forward direction at the position of the vertical blanking period recording portion d. Address signal A _K4 indicates that no kick is to be made on any of its tracks. Address signal for kick like this
The reason why the values of each code 32 and 33 of A _K1 to A _K4 are different from each other is that the pick-up playback element accurately scans the track to be played back during normal playback, which will be described later. This is to enable quick reproduction of a track that should be normally reproduced even when a track other than a track is reproduced.

FIG. 8 shows the video signal of each field recorded on the disk according to the present invention and the kick address signal.
The above code 32, 33 of A _K1 , A _K2 , A _K3 or A _K4
This figure shows the values of 34 and 34 and the recording order of the divided audio signal portions in relation to each other, and is a rewritten version of FIG. 4, and is indicated by the same reference numerals as in FIG. 4. However, the discontinuous points in the sound shown in FIG. 4 are indicated by black triangles in FIG. In addition, the broken line "1'" shown in the divided audio signal order indicates the silent part of the 0.5 field period before the divided audio signal part "1" recorded on the first track, and since it is not actually recorded, it is shown as a broken line. . Also "5a", "5b"
indicates the first half 0.5 field period and the second half 0.5 field period of the divided audio portion "5". In addition, code 32, 3 of address signal A _K1 to A _K4 for kick
3 and 34 are shown as being recorded over one field period for convenience of illustration, but this is to make the recording relationship clear, and in reality, as mentioned above, the vertical retrace line It is recorded in two horizontal scanning periods within the erasing period.

Next, an example of a reproducing apparatus for reproducing a disc according to the present invention will be explained. FIG. 9 shows a block system diagram of an example of a disc playback device applied to a disc playback device previously proposed by the present applicant. In the same figure,
41 is a disk having a track pattern shown in FIGS. 4 and 8, which is placed on a turntable and rotated synchronously with the turntable at high speed in the Y direction in the figure by a motor (none of which is shown). . Here, the rotation speed of the disk 41 is 750 rpm when a PAL or SECAM color video signal is recorded on the disk 41.
On the other hand, when an NTSC color video signal is recorded, 900 rpm is selected. By the above rotation of the disk 41, the reproduction needle 4 moves on the surface of the disk 41.
2 performs sliding scanning.

The regeneration needle 42 is fixed to one end of a cantilever 43, and a permanent magnet 44 is fixed to the base side of the other end of the cantilever 43. cantilever 4
The portion where the permanent magnet 44 of No. 3 is fixed is surrounded by a jitter correction coil 46 around a tracking coil 45 fixed to the reproducing device. Since the left and right coil parts of the jitter correction coil 46 are wound in the same phase, they simultaneously act as attraction or repulsion to the permanent magnet 44 depending on the polarity of the jitter correction signal from the input terminal 47. , the cantilever 43 moves directly in the track tangential direction of the disk 41 to correct jitter caused by surface runout or eccentricity of the disk 41. The tracking coil 45 generates a magnetic field in a direction perpendicular to the magnetic field direction of the permanent magnet 44, and moves the cantilever 43 upward in the Z direction (track width direction) in accordance with the polarity of the tracking error signal from the tracking circuit 61. Displace it in one direction and with an amount of displacement depending on its size.

A resonant circuit whose resonant frequency changes in response to changes in capacitance formed between the disk 41 and an electrode fixed by vapor deposition on the rear end surface of the regeneration needle 42 in accordance with the intermittent row of pits; A circuit that applies a constant frequency to a resonant circuit, a circuit that detects the amplitude of a high-frequency signal whose amplitude changes according to the change in capacitance from the resonant circuit, and a circuit that detects the amplitude of a high-frequency signal whose amplitude changes according to the change in capacitance. The high-frequency reproduction signal taken out from the pick-up circuit 48, which consists of a circuit for positional amplification, is supplied to the demodulation circuit 49, where the main information signals of the main track (in this case, the video signal and the audio signal) are demodulated and output. While it is output from the terminal 53, a portion is branched and supplied to the _p3 detector 50 and band filters 51 and 52, respectively.

_p3 detector 50 detects the third tracking signal.
The frequency of _p3 is selected from among the reproduced signals, and a _p3 detection signal phase-synchronized with this is generated and applied to the switching pulse generator 57. Further, the band filter 51 selects the frequency of the first tracking signal _p1 from the reproduced signal and sends it to the switching circuit 5.
On the other hand, the bandpass filter 52 selects the frequency of the second tracking signal _p2 from the reproduced signal and sends it to the switching circuit 54.
is applied to the second input terminal of. The switching circuit 54 is caused to switch by a switching pulse from a switching pulse generator 57,
For example, during the period when the switching pulse is at a high level, each output terminal of the band filters 51 and 52 is connected to the detection circuit 5.
On the other hand, during the low level period, the output ends of the bandpass filters 51 and 52 are connected to the input ends of the detection circuits 59 and 58, respectively.

The switching pulse from the switching pulse generator 57 is generated by the detection signal from _{the p3} detector 50 or the kick pulse from the kick pulse generator 56 (excluding the kick pulse that came in during _{the p3} regeneration period), which will be described later. When this occurs, the polarity is reversed. In this way, the detection circuit 58 extracts the envelope detection output of the reproduced tracking signal from the outer sub-track of the main track to be reproduced, and the detection circuit 59 extracts the envelope detection output from the inner sub-track of the main track to be reproduced. The envelope detection output of the reproduced tracking signal is taken out and applied to the next stage differential amplifier 60. A tracking error signal having a polarity corresponding to the direction of track deviation and a level corresponding to the amount of track deviation is taken out from the differential amplifier 60, and this tracking error signal is used for desired driving by a tracking circuit 61 including a drive circuit, etc. After being converted into electric power, it is applied to the tracking coil 45, thereby displacing the reproducing needle 42 in a direction and displacement amount that corrects the upward tracking deviation in the radial direction of the disk 41.

Further, although not shown in the drawings, a pick-up device including a regenerating needle 42 is field-fed by an upper field motor in the radial direction of the disk to perform linear tracking.

The main information signal demodulated in the demodulation direction 49 is supplied from an output terminal 53 to a known color video signal reproducing system and an audio signal reproducing system (none of which are shown) to produce a reproduced color video signal of the standard television system. After being converted into a two-channel playback audio signal and output to a monitor television receiver (not shown).

In the disc reproducing apparatus proposed by the present applicant, the disc reproducing apparatus according to the present invention is further provided with a kick control system for the reproducing needle 42, which includes a kick address signal reproducing circuit 55 and the like. That is, in FIG. 9, the demodulation circuit 49
The main information signal extracted from the main information signal is output from the output terminal 53, and is also supplied to the kick address signal reproducing circuit 55. The kick address signal reproducing circuit 55 detects and reproduces the kick address signal, and also determines the presence or absence of a kick and the kick direction based on the values of the codes 32 and 33. If the kick is present, the kick address signal reproducing circuit 55 detects and reproduces the kick address signal. Outputs a detection signal with the same polarity.

Reference numeral 62 denotes a changeover switch, which is connected to the contact A side during conventional disc playback and selectively outputs the playback mode signal input to the terminal 63 to the kick pulse generator 56, and is connected to the contact B side during normal playback of the disc according to the present invention. The reproduced output of the kick address signal is selectively output to the kick pulse generator 56.

Next, the cases of the still motion playback mode and the normal playback mode of the disc according to the present invention will be explained. First, during still motion playback, the still motion playback mode signal is input from the input terminal 63 as in the conventional case. The pulse is supplied to the kick pulse generator 56 via the changeover switch 62, which generates a kick pulse for forcibly moving the reproducing needle 42 one track pitch in the opposite direction (toward the outer circumference in this case) every rotation period of the disk 41. This kick pulse is applied to the tracking coil 45 via the tracking circuit 61 and is applied to the regeneration needle 42.
By applying a force to move the needle toward the outer circumferential side each time the third tracking signal _p3 is reproduced, and at the same time maintaining the polarity of the output switching pulse of the switching pulse pulse generator 57, the regeneration needle 42 is moved in the same way as before. Similarly, within the vertical blanking period recording portion a, the track is shifted to the outer circumferential side by one track pitch, and the same track is repeatedly reproduced. The solid line in FIG. 10 shows the scanning locus of the playback needle 42 during still motion playback of the disk 41. Among the track portions on the disk 41 having the track pattern shown in FIG. 4, the video signal of the same feed is repeatedly recorded on the track formed for one rotation starting from the recording position of the third tracking signal _p3 . Therefore, by repeatedly reproducing the same track as described above, a completely still still image of the same field with a color video signal can be obtained.

Note that when this still motion is played back, the normal playback audio signal is muted and is not produced.
Further, the feed of the pickup device including the regeneration needle 42 is stopped.

Next, the operation of the disc according to the present invention during normal playback will be explained. During normal reproduction, the changeover switch 62 is switched to the contact low side, and the kick control signal obtained by decoding and reproducing the code by the kick address signal reproducing circuit 55 is applied to the kick pulse generator 56. Here, as described above, the kick address signal recorded in the vertical blanking period recording portion a on the track to be normally reproduced is
The kick presence/absence instruction code 32 and the kick direction instruction code 33 of A _K1 indicate that the track is changed by one track pitch in the forward direction (here, inward direction) in the vertical blanking period recording portions b, c, and d. Since the instruction is given, a kick pulse for causing such a tracking change is generated and outputted from the kick pulse generator 56 to the switching pulse generator 57 and the tracking circuit 61, respectively.
As a result, the reproducing needle 42 draws a scanning locus as shown by the solid line in _FIG .
Plays every rotation cycle.

FIG. 12 shows the relationship between the scanning locus of the reproducing needle 42 and the recorded signal on the reproducing track during normal reproduction. In FIG. 12 and FIG. 13, which will be described later, the same parts as in FIG. The recording position of each field of the video signal is shown, and the number on the right side of the diagonal line shows the recording position of the recorded divided audio signal portion. Further, the solid line portion above the diagonal line indicates the reproduced track portion of the recorded track. As can be seen from FIGS. 11 and 12, the playback needle 42 reads the signal of one field period of the recorded color video signal in the order of A→B→C→D→E→F→G→... every field period. Since the fields are played back in sequence, a completely normal playback image is obtained.

On the other hand, as for the audio signal, as can be seen from FIG. 12, the divided audio signal portions are sequentially reproduced in the division order, so that a normally reproduced audio signal is obtained.
Moreover, in this case, the kick position of the playback needle 42 is within the vertical blanking period recording portions b, c, and d, and is a position that avoids the discontinuous points of the sound shown in FIGS. 4 and 12. Even if the kick position changes slightly for some reason, there is no discontinuity in the reproduced audio due to the kick, and a normally reproduced audio signal can be obtained continuously.

By the way, the above is the address signal for the kick.
This is the operation during normal playback when A _K1 is played back, but there may be cases where the kick address signal A _K1 cannot be played back due to dropout or other reasons. The disk reproducing device is configured not to perform a kick when the kicking address signal A _K is not reproduced, so in the above case, the recording track next to the recording track of the kicking address signal A _K1 that was not reproduced is recorded. The recorded address signal A _K2 for kick is reproduced. For example, when the kick address signal A _K1 recorded on the outermost track shown in Fig. 4 is not reproduced,
As shown in FIG. 13, after the outermost track is reproduced without being kicked, the address signal for kicking in the vertical blanking period recording portion a of the next track.
A _K2 is played. The kick address signal reproducing circuit 55 decodes the code of the kick address signal A _K2 , but as mentioned above, A _K2 indicates that it is to be kicked in the forward direction in the vertical blanking period recording portions c and d. Therefore, as shown in FIG. 13, the playback needle 42 is turned inward at the vertical blanking period recording portion c of the second track from the outermost track, and then at the vertical blanking period recording portion c of the third track. In order to reproduce the kick address signal A _K1 , which is turned to the inner circumferential side at step d and recorded in the vertical blanking period recording section a of the fourth track, this
A Once _K1 is regenerated, the 12th
A scanning trajectory during normal playback as shown in the figure is drawn. The scanning locus of the regeneration needle 42 at this time is the first
The order of the video signal fields to be played back is as shown by the solid line in Figure 5, and the order of the video signal fields is A→B→C→D→E→
The fields that should originally be played in the order of F→... are changed to A→A→A→A→B as shown in Figure 13.
It will be played in the order of →C → D → E →..., so
Although a completely normal reproduced image cannot be obtained, a normal reproduced image can be obtained in a short time. Also, audio signals pass through discontinuous points,
Normally reproduced audio can be obtained in a short time.

As described above, the disk according to the present invention is
When the disk is scanned and played back as shown in the figure, a completely still image can be obtained, and when the track is scanned as shown in Figure 11, a completely normal playback image and normal playback sound can be obtained. be able to. Furthermore, since color video signals are recorded on the disk of this embodiment having the track pattern shown in FIG. 4 without losing image information, when played back without any kick, the movement is smooth by 1/4. A double-speed slow motion playback image can be obtained. Furthermore, during the above-mentioned normal playback, since the data is played back every third track, the conventional 60 minutes of image information on one side is normally played back in 15 minutes.

Note that the disk according to the present invention is not limited to one having the track pattern shown in _FIG . It may also be recorded separately. Further, the kicking address signal _AK is recorded at the position where the reproduction needle 42 is to be turned during still motion reproduction, that is, within the vertical blanking period recording portion a where the third tracking signal _p3 is recorded. It may also be recorded in other recording portions b, c, or d. Further, when the track number code 34 is "0", it is a track to be played normally, so the scanning locus of the playback needle 42 may be changed by identifying this on the playback side.

Also, the values of the disk identification codes 31a and 31b are
Although I explained that it is "AA" in hexadecimal, for example, you can record the value "CF" on the track that should be played normally, and the value "CC" on the next three tracks. good. In this case, the values of the disc identification codes 31a and 31b, the kick presence/absence instruction code 32, the kick direction instruction code 33, and the track number code 34 correspond to each other, so the above values "CF" and "CC" are input to the playback device in advance. It is also possible to memorize it and draw a desired scanning locus by simply decoding the values of the codes 31a and 31b without decoding each value of the codes 32-34.

Furthermore, in order to prevent the playback needle 42 from scanning a discontinuous point in the sound if the address signal A _K1 on the track to be normally played is mistakenly played back, the track immediately before the recording track of the address signal A _K1 is The address signal is stored in the vertical blanking period recording portion d of the track.
The above codes 32, 33 and 34 instead of A _C , A _T
For example, the 12-bit value is "773" in hexadecimal notation.
To record another kick address signal which is , and to make the reproduction needle 42 scan over the track to be normally reproduced based on this other kick address signal even if the address signal A _K1 is not reproduced at the time of reproduction. You can also do it.

Furthermore, since there are two channels of recorded audio signals, one channel is sequentially arranged and recorded according to the scanning locus during normal playback as shown in Figure 4, and the other channel is used for other purposes (for example, 1/4 speed). For example, normal playback audio may be obtained during slow motion playback. Furthermore, although the above embodiment has been explained using the disk previously proposed by the present applicant as an example, it can also be applied to a light beam reading disk on which tracking signals _p1 to _p3 are not recorded (however, it is possible to A disc on which video signals of four or more fields are recorded is preferable).

Further, in FIG. 9, the kick address signal reproducing circuit 55 decodes the values of the disk identification codes 31a and 31b of the address signal _AK , and if the values are not predetermined values, the kick address signal reproducing circuit 55 decodes the disk identification codes 31a and 31b of the address signal AK, and if the values are not predetermined values, the kick address signal reproducing circuit 55 decodes the disk identification codes 31a and 31b of the address signal AK. Since the switch 62 can be configured to generate a signal in the event of a change, the changeover switch 62 can be made unnecessary.

As described above, the information signal recording disk according to the present invention has the same field of a video signal whose image information changes every field period repeated N times for one rotation period equal to N field periods (N is plural). (N
-1) Audio signals are sequentially arranged and recorded according to the scanning locus at every track interval, and are composed of a synchronization code, a disc type identification code, a kick presence/absence instruction code, and a kick direction instruction code to force the pick-up playback element to track. Since the track change address signal for instructing the presence or absence of a change, the change direction, and the change position is recorded in at least one location for each revolution, software producers can freely specify still image recording, normal image recording, and audio recording. Yes, NTSC,
Complete still images, complete normal playback images, and normal playback audio of standard television color video signals such as PAL or SECAM can be selectively played back, and tracks can be changed at the bit position of each code above. It is possible to indicate whether or not to change the track and the direction of the track change using the position and bit value, and furthermore, the discontinuous point of the audio signal can be placed and recorded at a position different from the position where the track is forcibly changed by the pick-up playback element. Therefore, even if the track is changed during playback, normal playback audio can be obtained smoothly without causing audio discontinuity at that position, and even if there is a slight deviation in the forced track change position, It has features such as being able to smoothly obtain normal playback audio.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing an example of a track pattern of an information signal recording disk proposed by the applicant;
FIG. 2 is a block system diagram showing an example of the recording system of the information signal recording disk according to the present invention, FIGS. 3A to 3D are signal waveform diagrams for explaining the operation of FIG. 2, and FIG. 4 is the present invention. 5A and 5B are diagrams showing an example of the structure of a chapter address signal and a time address signal, respectively. FIG. 6 is an information signal recording disc according to the present invention. FIG. 7 is a diagram showing an example of the structure of the kick address signal recorded in FIG. 7, and FIG. 1 schematically shows an example of the relative recording positional relationship between the video signal field recorded on the information signal recording disk according to the present invention, the predetermined code of the kick address signal, and the recording order of the divided audio signal portions. FIG. 9 is a block system diagram showing an example of a reproducing apparatus for reproducing an information signal recording disk according to the present invention, FIG. 10 is a diagram showing an example of a track scanning locus during still motion reproduction, and FIG. 12 is a diagram schematically showing an example of the relationship between the track scanning locus during normal reproduction and the signal recorded on the track during normal reproduction according to the present invention; FIG. FIG. 13 is a diagram schematically showing an example of the relationship between the track scanning trajectory and the signal recorded on the track during normal reproduction when the kick address signal cannot be reproduced. 1, 2... Audio signal source, 5, 9... Mixer, 6... Color video signal source, 10... Address signal generation circuit,
11...Tracking signal generator, 16, 22, 2
8...Synchronization code, 17,23,29...Line identification code, 18,24,30...Audio identification code, 3
1a, 31b...Disc identification code, 32...Kick presence/absence instruction code, 33...Kick direction instruction code, 34...Track number code, 41...Information signal recording disk (disk), 42...Reproduction needle, 43...Cantilever, 44...Permanent Magnet, 49... demodulation circuit,
54...Switching circuit, 55...Kick address signal regeneration circuit, 56...Kick pulse generator, 6
0...Differential amplifier.

Claims (1)

[Claims] 1. The same field of a video signal whose image information changes every field period is repeatedly recorded N times for one rotation period equal to N field periods (N is plural), and The audio signals are sequentially arranged and recorded according to the scanning locus of every (N-1) track of the pick-up reproduction element when obtaining a normal reproduction image of the video signal, and a synchronization code,
A track change address signal, which is composed of a disk type identification code, a kick presence/absence instruction code, and a kick direction instruction code, is sent at least once every rotation to instruct the pick-up playback element as to whether or not to forcibly change the track, the change direction, and the change position. An information signal recording disk characterized by being recorded in one place. 2. The kick presence/absence indication code and the kick direction indication code are each 2 of the number N of bits equal to the number of N field periods recorded per revolution of the information signal recording disk.
It is set in a base number, and the value of each bit of the kick presence/absence instruction code is the value of the track in the vertical blanking period recording portion corresponding to the bit position among the N vertical blanking period recording portions for one revolution. The first aspect of the present invention is characterized in that each bit indicates whether or not there is a forced change, and the value of each bit of the kick direction instruction code indicates the track change direction in the corresponding vertical blanking period recording portion. Information signal recording disk described in Section 1. 3. Claim 1, characterized in that the discontinuous point of the audio signal is arranged and recorded at a position different from the forced track change position of the pick-up playback element.
2. Information signal recording disk as described in item 1 or 2.