JPH04126480A - Moving picture, still picture simultaneous recorder - Google Patents

Abstract

PURPOSE:To record or reproduce a still picture with high picture quality by providing a still picture recording and reproducing process circuit integrally in a conventional VTR and recording a still picture on one and same magnetic tape while recording a moving picture signal on the tape. CONSTITUTION:A luminance signal of a video signal inputted from a video signal input terminal 150 is FM-modulated by a moving picture information processing circuit 154 in the case of an 8mm VTR. Moreover, a chrominance signal is subject to low frequency conversion, the result is fed to a switch 159 and recorded on a magnetic tape via video heads 21,22 on a rotary drum 20. Moreover, the video signal passing through a switch 152 is converted into a digital signal by a still picture information processing circuit 155. Then after required digital signal processing such as addition of a correction code is applied to the signal, the result is modulated by a proper modulation system, and the modulated signal is digitally recorded on the magnetic tape via switches 158,159 and video heads 21,22.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an apparatus that uses a magnetic tape as a recording medium and is capable of simultaneously recording moving images and still images using a rotary head.

[Conventional technology]

When a television camera with a videotape recording function, ie, a video camera, is photographing, there is a desire to record a particular scene as a still photograph (or still image). Previously, for example, if you were walking and shooting with a video camera and there was a scene you wanted to shoot with a still, you could interrupt 412 on the video camera and shoot with the still camera. was. In such a situation, you would have to carry two devices, and you would have to stop recording with your video camera.
Moreover, this poses various problems, such as the risk of missing a %-t photographic opportunity. Therefore, in order to solve such problems, the special public
A still camera with a still camera, as disclosed in Publication No. 261968, which combines a still camera and a video camera into one device, and enables still shooting by operating the still camera without interrupting shooting with the video camera. A video camera is being captured. Furthermore, a so-called 8 mm video is an example of a device capable of recording moving image signals and other information signals. The 8mm video standard allows audio signals to be recorded as time-compressed PCM signals together with video signals (moving images), and has already been commercialized. Patents related to this 8mm video standard include, for example, Japanese Patent Publication No. 60-55886 and 60
48044, etc., six of these prior art techniques, the basic idea of which is shown, will be explained. FIG. 8 is a diagram showing the tape format in the 8 mm video standard, and the ninth leap is a diagram showing the format of one track. Figure 10 is a diagram showing the state of the winding of the rotating head drum and magnetic tape used in 8mm video, and Figure 11 is a diagram showing the frequency allocation of each signal in the 8mm video standard. . 8mm video video signals for NTSC and PAL formats are recorded using the low frequency conversion color signal recording method, which is the basic recording method for home video tape recorders (hereinafter referred to as rVTRJ). be. Luminance signal is 4.2-5
．． FM modulated with a 4MHz carrier wave, and the color subcarrier is approximately 74
The signal is converted to a low frequency of 3 KHz, and both are frequency-multiplexed and recorded. The recording format of tape 7 is as shown in FIG. , Hideoiha (luminance: FTI, 1 color, 1 inch), audio signals, Toranokingi=, and other minimally necessary VTR signals are all frequency-multiplexed using a rotating video hesid.
;C! 1, the frequency band is shown in Figure 11. On an 8 mm wide tape, the area used to record the video words is only 5.351 mm, which corresponds to 180 degrees of the rotating drum. The remaining approximately 41 degrees of the rotating drum (approximately 1.25 mm > is the area used for recording PCM audio, etc. fl I +1
It is. Cue and track +1 for fixed heads on both ends of the tape
051 and an audio track (+06+).In 8mm video, the control track at the end of the tape is not used, so the idea is to use this track as a cue track.The specific standard has not been decided, but It can be used for numbering recorded contents, etc.The width of one track (track pitch) is 20.5 μm, and it can be used for β format and VHS +
Slightly wider than the long-time mode pitch of Type 7 (β-m is 1
9.5μm, VIIS 6 hour mode is 192μm
). A guard punt for crosstalk prevention IL is not provided between tracks; instead, 2-head azimuth recording is used to suppress crosstalk. Voice believe, tc! There are three types of green systems including options: ■FM audio, and ■PCMPCM audio. ``M audio is standard equipment, but due to image quality deterioration (resolution decrease), it is 1 channel instead of 2 channels.
The recording method is video signal and frequency multiplex recording using a rotating video head, the carrier frequency is 1.5 MHz, and the maximum frequency deviation is ±100 KHz. From this, the center frequency C of the FM-modulated luminance signal is approximately 5
MHz) and the FM audio carrier wave (1.6MHz) is 3.4MHzL, and as a result, the recording and playback resolution of the luminance signal is about 270 mm, which is NTS
There is not enough bandwidth to record C signals.
. Simultaneous video recording with high quality audio and the above [・
Dubbing that cannot be done with M Audio. In both cases, PCM audio is realized, and as shown in Figure 10 for 8mm video, the winding angle of the drum, which is normally 18 degrees, is increased by about 30 degrees, and PCM audio is applied to this part.
Recording audio signals. Next, the specific circuit operation of the conventional example will be explained using FIGS. 12 to 15. FIG. 2 is a blow I/J path diagram of a conventional example, in which a video signal applied to a video signal input terminal (1) is applied to a video signal processing circuit (3) and a synchronizing signal separation circuit (4). The output signal of the video signal processing circuit (3) is sent to the gate circuit (5).
and (6) and is added to adders (13) and (14). On the other hand, the vertical synchronization signal output from the synchronization signal separation circuit (4) is supplied to delay circuits +7115 and (8). The Q output of the delay circuit (7), which together with the synchronization signal separation circuit (4) constitutes the head switch pulse generation means, is transmitted to the first gate circuit (5) and the fourth gate circuit (12) to be described later.
The Q output is supplied as a gate pulse to a second gate circuit (6) and a third gate [1 path (11), which will be described later]. , the output signal of the delay circuit (8) is sent to the time axis compression circuit (9) and the erase current generator (
40). In addition, the audio number given to the reputation signal input terminal (2) passes through a time axis compression circuit (9), a modulation circuit (10), and a changeover switch (41) for recording and erasing, and then passes through a third gate. It is supplied to the circuit (11) and the fourth gate circuit (I2). Further, the output of the erase current generator (40) passes through a write-erase switch (41), and then passes through a gate circuit (11).
) and (12). The output signals of gate circuits (11) and (12) are sent to adders (13) and (1
4). The output signal of the adder (13) is
The signal is applied to the rotary transformer (17) via a regeneration selector switch (I5). The output signal of the rotary transformer (17) is given to the rotary magnetic head (21) via the rotary shaft (19) and the rotary head bar (20), and is applied to the magnetic tape (23).
A recording current or erasing current is applied to the On the other hand, the output signal of the adder (14) is also
) for switching between recording and playback (16
), the output of the single-rotation transformer (18) (No. 3 is the rotation axis +191, and the output goes through the nodbar (20) to another rotating magnetic head ( 22), and causes a recording current or erasing current tFi to flow through the magnetic tape (23).The magnetic tape (23) is connected to the rotating magnetic head (211, +22
1 is guided by guide posts (24) and (25) located on both sides of a table guide drum (26) incorporating a (27
) is driven at a constant speed in the direction of Note that since a well-known table guide drum can be used, a detailed description of the structure will be omitted here. During reproduction, the signal reproduced by the rotating magnetic head (21) is transmitted to the rotating head bar (20), the rotating shaft (19), the rotating transformer (17), and the changeover switch (15).
It is supplied to a separation circuit (28). On the other hand, the signal reproduced by the rotating magnetic head (22) is transmitted through the rotating head bar (20), the rotating shaft +191, the rotating transformer (18), and the changeover switch (I6) to the separation circuit (29). One output of the separation circuit (28) and one output of the separation circuit (2) are connected to the p adder (3).
0). Further, the other output of the separation circuit (28) and the other output of the separation circuit (29) are connected to an adder (31).
is supplied to The output signal of the adder (30) is supplied to the video signal output terminal (33) via the video signal processing channel 1 (32). On the other hand, the output (It signal) of the adder (31) is supplied to the audio signal output terminal (37) via the time axis correction circuit (34), demodulation circuit (35) and time axis expansion circuit (36). The operation will be explained below.The video signal applied to the video input terminal (1) is converted into an FM signal by the video signal processing circuit (3).In addition, when the carrier color signal is included, the carrier color signal is is about 1.2MH
z and below). Furthermore, as a method for removing adjacent color signals, for example, IH (horizontal scanning period)
There is no problem even if the phase of the carrier color signal is rotated by 90 degrees or reversed each time.This is a technique for removing crosstalk between tracks using the line correlation of the carrier color signal. Images A and C processed as described above are supplied to first and second gate circuits (5) and (6). -h, by adding the video signal (j) to the synchronization signal separation circuit (4), a vertical synchronization signal is obtained at its output terminal.
The 6-delay circuit (7) supplied to the
Pulse signals Q and Q for head switching as shown in Figures (b) and (cl) are sent to the first and second gate circuits (5
) and (6), respectively, to clarify the phase relationship between these pulse signals Q and Q and the input video signal, an example of the waveform of the input video signal is shown in FIG. As shown in FIG. 14 (at and (bl)), the processed video signal is output to the output terminals of the gate circuits (5) and (6) during the period when the pulse signals QJe and 6 are at H level. A modulated compressed audio signal or a cancellation signal, which will be described later, is added to these signals by the first and second adders (13) and (I4), and then supplied to the changeover switches (15) and (16). Compressed audio (I is a modulation suitable for tape head systems, especially pulse hood modification, !1 (1" CM), j, tFM, PM
, AM or M, or in some cases unmodulated AC bias, :C! ] is received by the modulation circuit (1o). In particular, I'CM is advantageous in that a high SN ratio can be expected, and well-known code error correction means can be used to prevent dropouts. Such a modulated compressed audio signal is transmitted through a changeover switch (4) for switching between record and erasure.
1) to gate circuits (11) and (12) to which pulse signals Q and Q are supplied. These gate circuits (11) and (12) connect the compressed audio signal to the adder (13) in the pulse signal direction and during the period when Q is at H level.
) and (14). Moreover, the erase current generation circuit (40) is! The signal obtained by delaying the serial synchronization signal with the delay circuit (8) has a frequency (for example, 100K) whose oscillation start time is controlled by the signal T.
H7, ) is generated, the write-erase changeover switch (41) is turned on, and the erase current is applied to the gate circuits (11) and (I2) to which the pulse signals Q and Q are supplied. These gate circuits (11) and (12)
Similarly to the recording of compressed audio No. 1.1, the I:i pulse signals Q and Q output the above-mentioned erasure at error to the adders (13) and (14) during the H level period. FIG. 15 (at and bl) are waveform diagrams of the output signals of the adders (13) and (14), that is, the time axis event signals of the processed video signal A and the processed audio signal B or cancellation signal. By supplying these signals to the rotary magnetic heads (21) and (22) through the path described in 1. above, a tape magnetization pattern as shown in FIG. 8 is obtained. , the magnetic track (1011jl) and (+021) of the video signal track section Tll0I are video signal tracks, each corresponding to the l field.The audio signal track section (magnetic track N with diagonal lines II+1)
n31 and (+041) are the magnetic tracks of the audio signal. During playback, changeover switch ++5) and [movable contact 161) 1 are switched to the fixed contact 1J side. In this way, the two channels of endogenous signals generated by the rotating magnetic heads (21) and (22) are transmitted to the rotating head bar (20).
, rotating shaft (I9), rotating transformer (17) or T+
81 is supplied to the separation circuit (28) or (29) via the changeover switch (15) or (16). In the separation circuits (28) and (29), the input signal is separated into a video signal and an audio signal on the time axis, and the separated video signal is converted into a temporally continuous signal by an adder (30). The video signal processing circuit (32) is converted into an l-channel video/image signal and supplied to the video signal processing circuit (32).
), the input signal is restored to the original video signal and output to the video signal output terminal (33). On the other hand, the separated audio signal is also converted into a channel signal by the adder (31) and is supplied to the 1 time axis correction circuit C34). or BBr) (Packet/
The device consists of a semiconductor memory such as a bridge device (Brigate device), in which time-base fluctuations (so-called jitter and skew f) of the tape head system are removed. Time axis correction amount #
(The output signal of 341 is the original compressed sound 1 in the duplex circuit (35).
! (Converted to fIT number and further composed of semiconductor memories such as ccn and mouth BD - 1 path (36)
The original audio signal is restored and output to the audio output terminal (37). In this way, the winding angle of the magnetic tape around the head drum is slightly larger than 180", and the overscan section is used to record and play back an audio signal compressed on the 9 time axis using a rotating magnetic head. The recording band is determined by the relative speed between the rotating magnetic head and the magnetic tape, and has little to do with the running speed of the magnetic tape. This enables high-density recording, that is, long-term recording and playback of video signals. Even if the running speed of the magnetic tape is slowed down, it is possible to record and reproduce audio signals favorably. Although the performance has been dramatically improved compared to the above-mentioned FM audio, as mentioned above, the original video of V'[' It is not possible to completely record even the information of the 9-channel signal.Let alone the high-definition TV 4-4 or M[JS
E4R is out of the question.In recent years, the carrier frequency of the FM luminance signal has been increased in various 7-ohm home VTRs (VH8 and 8mm video), and the resolution and C/N have been improved by increasing the band and deviation. As a result, it has become possible to record NTSC and r'AL television signals sufficiently in terms of resolution, but it still cannot catch up with professional VTRs in terms of S/N ratio and waveform reproducibility. It is in a state where it is not. On the other hand, from a social perspective, demand for still image information storage devices such as electronic still cameras and IC card cameras is increasing.
In particular, it is expected to play a role as an image information input terminal when connected to a computer or the like. In other words, home VTRs can also record videos of daily life.
This means that it can be used not only as a device, but also as a high-quality information recording device 21 at home or in the field. Due to this situation, home V'rR and surveillance V T
Products such as R that are capable of so-called "intermittent recording" are already on the market, but these products cannot record two moving images and one still image at the same time. This invention was made in order to solve the problems mentioned in F. It is possible to record moving image information in real time, and also to record high-quality still image information at the same time. The purpose is to obtain a simultaneous recording and reproducing device. [Means for Solving the Problems] A magnetic tape recording and reproducing device according to the present invention
A still image recording and reproducing process circuit is integrally provided in R, and still images are recorded on the same magnetic tape while recording a moving image flaw signal. [Function] The still image recording process means of the present invention extracts only one field or the integer field of information from recorded moving image information without adding a special optical system or mechanical system, Image information is time-expanded when recording images, and conversely compressed when recording images, so it is possible to keep the recording data rate low and record high-quality #+G images.
I can do both. [X Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1st
The figure is a schematic diagram of one embodiment. In the flash, Tl5O), (+511) is the input terminal for the video signal, +153) is the input terminal for the audio signal, and the input terminals +1501. The video signals input from (+51) may be different video signals or the same video signal. For example, in the case of a camera/body type VTR, both human input signals may be imaging signals from the camera, or one of the imaging signals and The other side may be another video signal manually input from the outside, switch +1
521 is for selecting the input video signal. The video signal input from the video signal input terminal (150) is FM-modulated for the luminance signal by the moving image information processing circuit (+541) for 8mm video, and the color signal is low-frequency converted and then passed through the switch (IF+91). , is recorded on a magnetic tape (not shown) l- via the video head +211. It is converted into a digital signal by +551, subjected to necessary digital signal processing such as adding a correction code, modulated by an appropriate modulation method, and then sent to the switch (+551).
581. (+591 and Video Head +211.
The still image recording trigger switch (+57), which is digitally recorded on the magnetic tape via the synchronizing circuit (2191), is operated when you want to record a high-quality still image from the input video signal. switch +15
By switching 81, the output signal from the still image information recording processing circuit (+56) is recorded where the PCM audio signal processed by the PCM audio recording processing circuit (+56) is normally recorded. There is. Similarly to this, a still image recorded with Tebuto's Cutora++)ri/nod f+641,, C! A signal indicating the start time of recording is generated in the still 1F image recording code creation circuit (1601), amplified, and supplied to the identification head Tl 641 (1), which is the configuration of the recording system block. +211.
(The playback signal played by 221 is switched to switch f+651 for each area of the tape track. Switching λ by Tl681,
No. 43 in the moving image area is the moving image information reproduction processing circuit Tl66.
1, the signal in the still image area (or 1), the signal in the CM audio signal area) is sent to the still image information beef processing circuit Tl67.
1 (or PCM audio playback processing circuit 11691
) to each output terminal (+711° (1721(
Alternatively, it is sent out as a reproduction signal at (+731). The cue track signal reproduction circuit (+701) detects the still image recording start time from the reproduction signal reproduced by the fixed head (+641), and then connects the inter-chamber period switch (1681) to the still image information reproduction circuit +1671 side. The second section is a professional circuit diagram showing the configuration of the cow circuit and the overall system configuration of the embodiment shown in FIG. The dotted chain line indicates the image information recording Kawagyu circuit +200), which corresponds to the number 1 in Figure 1.
This is a combination of the image information recording and reproducing circuit f+551 and the image information reproducing circuit f+1671. Second
The other parts of the figure are the same as those of the conventional example (see FIG. 12), so the explanation will be omitted. In the figure, the (20+1 analog-to-digital (A/r)) converter samples the input video signal (analog l) at a certain period and converts it into a digital signal, and its output is the time signal for the next stage. Axis expansion memory (supplied to 2021. This memory + 2021 stores image data for one frame, for example. By lowering the clock rate during reading from the clock rate during writing, the time axis is expanded. At this time, in order to store l frames worth of image data in synchronization with the vertical IgltZ signal, the synchronizer circuit +2191
supply vertical synchronization signal to This synchro circuit (219
1 is configured as shown in Figure 3, and the waveform of the trough is as shown in Figure 4 (al~(el).
A small pulse (31101) is generated at at, which is input to the flip 70/tub circuit f30+1 to prevent the trigger switch pulse from chattering.
> is input. The vertical synchronization signal from the synchronization signal separation circuit (4) is also manually input to this gate circuit (3031).
Since the trigger switch pulse (3021) and the vertical synchronization signal are generally not synchronized, the digital C video signal that has passed through the A/D converter +2011 is taken into the time axis expansion memory +2021 for a period that is an integral multiple of the vertical synchronization period as the minimum unit. Therefore, it is inconvenient to start importing into the memory at the timing of the trigger switch pulse (3001 itself).Therefore, in the gate circuit (303), the logic is inverted at the falling edge of the trigger switch pulse (3001), and vertical synchronization is performed. A pulse whose logic is inverted again at the falling edge of the signal (fourth pulse)
2K(c))), and then create a constant width pulse (3(141(see Figure 4)) synchronized with the falling edge of this pulse.
)) (hereinafter referred to as [sieve 1 to image) recording start f; ) (Figure 4(e) #-
Input to the monostable multivibrator (3051) that generates a pulse (hereinafter referred to as "memory S period pulse").Still image recording start chair number (3041 is the static +
A still picture start signal is supplied to the picture recording code creation circuit 11601, and a still picture start signal is written to the picture record code.
In FIG. 2, the memory write period pulse (3061) is supplied to the time axis expansion memory +2021, and the A/D conversion circuit (20+1
Data writing from is enabled. After this memory write period pulse (306) ends, the time axis expansion memory (
In order to guide the image data read from 2021 to the recording head, switch 9 (1581) is turned to the still image information recording processing circuit Tl551 side for the still 1L image recording period.The still image data sending pulse is sent to the monomulti circuit (3041). The image data read out from the time axis extension method (202+) includes the digital VTR (rl-1
Alternatively, add a parity generation circuit (2031 to 1, +a r
Scrambler the data +2 to remove the fL component.
Randomize with 041 and +2051, and divide the data into each l field. After this, modulator +20
61, (2071 performs appropriate digital modulation (details will be described later), and the gate circuit (11) and
Digitized still image information is recorded in the PCM audio signal area +I + 11 of the tape via the video head (21) and +141. On the playback side, the playback signal obtained from the video head (21) and +221 is sent to the switch (16 ), (+91 and separation circuit (28), (291), P
0 to separate signals in the CM area and signals in the moving image signal area
The reproduced signal for each separated I field is sent to a demodulator (ZOf
lI. [209] and demodulated as digital data. After this, time axis correction circuit +2!01. +211
The I-river data, in which time-axis fluctuations due to motor speed fluctuations and videotape expansion/contraction are suppressed through 1, is combined into 1 data block by a descrambler, which is the opposite of the randomization process used during recording. +2121. (2
131, and data errors that occurred during the recording process are
Error 6) Positive/Article 1F circuit (2141
sent to. This error J +E・Repair +E circuit (2 + 4
The video signal converted into 1 field data by 1 is transferred to the time axis expansion memory (2021) at the same clock rate as the readout clock at the time of recording, and to the next stage time axis compression memory + 2.
This stored data is then read out at the same clock rate as the δ-inclusive clock of the time axis expansion memory [2021, and is output to the digital output terminal +2161 as still image digital data. The data is manually input to the next-stage D/A converter (2171), converted into analog data, and outputted as analog image information from the analog output terminal (218+).As explained below, according to this embodiment. Since the digitized video signal is recorded in the PCM audio area of the 8mm video standard, it is possible to record a still image on the same medium at the same time as a moving image, but there is also an additional feature.Comparing the still image with the moving image. This is a sufficiently high quality number.
;C! I will explain in detail the following points that can be used for beef cutting. FIG. 5 shows the tape format of the 8 mm video standard shown in the conventional example (same as in FIG. 8). It shows a portion recorded for fields (40 tracks). In Figure 5, +1101 is the normal video signal recording area in the 8 mm video standard (hereinafter referred to as [main track J) where the wrap corresponds to an angle of 180°, and 1+111 is the part where the wrap exceeds an angle of 180°, which is normal. is the PCM audio recording area (hereinafter referred to as "extension track"), and (+051) at the top end of the tape is the cue track, and the identification head (+64) is used to record the recording start signal (30
4) During AC bias recording (frequency of several tens of KHz) L, during both recording, the reproduction signal is manually input to the still image information reproduction processing circuit (+671) shown in Fig. 1 for a predetermined time from this recording start signal (3041). 7 In addition, an audio track +1061 is provided at the chibuto end, which does not allow audio recording with a fixed head, which is treated as an option in the 8mm video standard.Here, the main track +1101 and the extension track・Tsuku (
The track length ratio of I11) is about 180° to 36°, which is 5 to 1, so it is +3 C in the 8 mm video standard.
M audio is time compressed and extended track + Il + 1
1 field period (1/60 second) is recorded. If the same thing were applied to still image recording, the recording density would become extremely high, and it would be impossible to record with a sufficient C/N ratio with the head used in 8 mm video. For example, in order to achieve the same quality as the digital VTRD-2 format, an 8-bit, N'rSCl!AI television signal, and a 4[ic(fsc) two-color subcarrier 3.
When sampling at 579545MHz), the data rate is only bits 1a and 8b x 4 r*
r=I 14. FiMb/s=・11), and this is extended track +1l11 (Tora 9ri Q slope O cape 5
'', the track has 1.25++mzsinθ
=I4.3mm1, if one field period (1/6 (: second)) is recorded, the recording linear density is l25.4
mm. 114, 5Mb/s X −X −= 3.4 & 181
"l - (2) 60 s 14.3 mm, which is an extraordinary value. Generally, the relationship between lc!edge line density (L)L) and C/N ratio, recording koji density and error rate (BER) is Figures 6 and 7
As shown in the figure, as DL increases, the C/N ratio decreases and the BER increases. Since the recording linear density of digital V1"H currently on the market or announced is from 50 BPI to 100 BPI, it is not possible to record very high-quality video using the above formula (2). Therefore, In this example, in order to lower the recording density, we decided to extend the time axis and lower the data rate, and to achieve this, we changed the memory writing and reading clock rates as described above, and the !field The digital data is divided into martyrdom tracks instead of !tracks, and the 8mm video is 7' narrow recording, and the shortest J recording wave has a relative speed of 3.75m. /s, maximum, "Wll chilia frequency is 5.
4M1lZ (7.7 M If y in Heibant,
), so it is approximately 069 μm (0.49 μm),
The C/N ratio in such analog recording is 5 (1d B
It's about digital'! In the record, it is 15 d more than that.
It is generally said that the recording time can be shortened to the point where the BPI is low, so as shown in FIG. 6, a sufficiently high-quality image can be obtained even with a recording Al11 density of 100 and BPI. Therefore, to record a signal with a data rate of 14.5 Mb/s at an all-density of 100 KBPI, the required number of tracks N is N=114.5 Mb x 25.4''''''60 x 1
4.3m+nX 100Kb "34"U'ri/
Field) -...?・−・+3) A record line! ! One degree is half of history (50KBP11
In order to do this, one field must be divided into 68 tracks.In the case of the fifth bacteria, one field is divided into 40 tracks.
The example is split into smaller tracks. still. This 40 tora 11/ri (40 field time) is within 1 second, Amakawa 1, Shizuka 1 [image can be recorded +t, 'I
It's never too long. The following is a case of No. 16, which has a narrow band called NTS C, but even if there is 30 MHz in the span of a span, such as in the case of NTS (In Hanawamoto's view, the response is Roe's ability.6 Also, in the case of guard panless, where there is no recording band between the recording track ≠ I, such as 8 mm video, crosstalk from adjacent tracks However, in such a format, for example, the digital VTRD-2 format uses the M'' [Modified Miller) modulation method and records without low frequency components, which reduces the azimuth loss (8 mm video). By using 10'), it is possible to sufficiently reduce adjacent crosstalk and perform transmission with a low error rate. Without introducing any mechanism, for example, by simply adding a digital filter to a home V'rH system, it becomes possible to simultaneously record still images and conventional video recording. In the example described above, the first self-recording start ID number (304+
Recorded using the cue track number (fixed head 1164).
For beef cattle, this is an extension track using a co-rotating head (
Il+), it may be possible to record and re-record the data. In addition, in the above embodiment, the PCM sound, SR 4M signal processing circuit and the static IL image signal processing lot path are connected by a switch (+59
1° (Although it was switched in 1651, the PCM line processing circuit is not a subject of the present invention, so it may not be necessary. In the above embodiment, the 8 mm video format was used as an example. This can also be done with the VHS system, in which case there is no PCM area.You can record still images on the guard band, or record still images on the control track or audio track with a fixed head. Good. [9! Bright effect J As described in 1., according to the present invention, the digital still image 16:"-j- is recorded on a plurality of extension tracks and transferred to +Q' Since t=-4, it is possible to simultaneously record a moving image and a high-quality still image on the same recording medium, resulting in a V i' +7.

[Brief explanation of the drawing]

FIG. 1 is a schematic block circuit diagram of the recording/reproducing system of the present invention, and FIG. 2 is a detailed block circuit diagram of this 'J: & example.
Figure 3 is a block circuit diagram of the synchro circuit of this embodiment.
FIG. 4 is a timing diagram thereof, FIG. 5 is a diagram showing the tape magnetization pattern of this embodiment, and FIG. 6 is a tc! in digital recording! Characteristic diagram showing the relationship between recording density and C/N ratio, No. 7
The figure is a characteristic diagram showing the relationship between recording linear density and error rate in digital recording, Figure 8 is a diagram showing the tape format of a conventional moving image recording device e (8 mm video), and Figure 9 is one track. Figure 10 is a diagram showing the relationship between the drum and tape for 8mm video rotation, Figure 11 is a small diagram showing the frequency allocation of 8mm video, and Figure 12 is a conventional diagram. 8 (
V 'I' l(0) video, l'C' M j-f
t" Note u L'+ '! Circuit (') -, I O
13, 14, and 15 are waveform diagrams of the troughs in the conventional example shown in FIG. 12. 120112+1-...9 degrees to rotation, +1541
・・Moving image information recording processing circuit, (1551-・・Static th
Image information recording processing circuit, +1571-... Still image recording triggers, +1581. (1591, (1
651, +1681... Switch, +1601-1° still image recording start code creation circuit, (166+... Trend image information reproduction processing circuit, (+67) -... Still 1h image information beef cattle processing circuit, +1701-... Cue track signal reproducing circuit, [2191-- synchro circuit. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A means for recording video signals on a main track of a magnetic tape using a rotating head, and recording digitized still image data on a plurality of extension tracks formed following the main track by the rotating head. What is claimed is: 1. A simultaneous video and still image recording device characterized by comprising means for recording.