JPS6096986A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent generation of picture color shift by allowing an address counter which supplies an address to a memory element restored by extending the time base of a time-base compression color difference signal to follow up a horizontal synchronizing signal as a constitution element of a PLL circuit. CONSTITUTION:After a luminance signal and a color difference signal of a color image signal are compressed in terms of time base, they are multiplied by time division, and recorded in a recording medium by modulation of frequency. A time-base compression color difference signal, which is converted in an analog- digital manner by an A/D converter 15 at the time of reproduction, is supplied to an RAM16, and the signal becomes a regenerative color difference signal whose time-base is restored by extending time-base by a RAM35. A signal from a synchronizing separation circuit 6 is supplied to a PLL circuit 49 which is composed of a comparator 44, an LPF45, a VCO46, a counter 47 and an address counter 48. The address from the counter 48 is supplied to the RAM16, and the relation between the timewise position at which a horizontal synchronizing signal arrives, and the timewise position which switches the condition of writing and reading of the RAM16, is controlled constantly. In this way, generation of picture color dislocation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Subject of the Invention) The present invention relates to a recording/reproducing device, and in particular, the luminance signal and color difference signal of a color video signal are time-division multiplexed after human noise time axis compression, and frequency modulated. Recorded on a recording medium (for example, magnetic deso), the generated frequency modulated wave is FM
After the role is played, the time axis is extended - CC reproduction color video Shinkin ff
13!11 on the recording/playback device.

(Prior art) Current color video signal recording and reproducing devices (for example, V T
The recording/reproducing device that occupies the mainstream behind R) is the standard! % (method (e.g. N T S C'jj formula, 1) AI-, lj
A 15g composite color image of the 3D or SECAM format is produced by separating the color signal and the low-frequency conversion carrier color signal by a large amount, and the luminance (
The signal G is frequency-modulated to become a C-frequency modulated wave, and the carrier color signal is frequency-converted to a low frequency band to become a low-frequency converted carrier signal 8, which is then frequency-division multiplexed to the above frequency-modulated wave and recorded. It is well known that there is a recording and reproducing apparatus C that uses a so-called low-frequency conversion recording and reproducing method, which obtains a composite color image 1η: signal based on any standard method even if signal processing is performed in the opposite manner to that during recording.

The recording and reproducing apparatus using such a low-frequency conversion recording and reproducing method is applicable to (11) consumer VTRs where the available band is relatively narrow because the band of the luminance signal can be arbitrarily selected.
Particularly suitable for this purpose. ■ The demodulated color signal is affected by the P1 raw time axis fluctuation of the VTR, and ■ Only the luminance signal passes through the FM modulation and demodulation system. Since the recording is not played back, there is less beat interference, and the frequency modulated luminance 70 acts as a high frequency bias, allowing the carrier color signal to be directly filtered. It has the advantages of

However, on the other hand, the above-mentioned low-frequency conversion recording/reproducing method g.
In order to achieve a higher level of 7', the recording and reproducing bands of the luminance signal and carrier color signal are limited and are somewhat insufficient, and the lower band conversion carrier color signal is compatible with NTSC or PAL color video. When recording a signal, there is a flat tjj modulation wave t′,
) Due to uneven contact between the I and I, playback low-frequency conversion transport (!! Shinzuki's A The two heads that record and play back the video me rack are at an azimuth angle a' to each other.
k, recording using the so-called azimuth recording/reproducing method, which records and forms video tracks without guard bands and is set to ¥4; I: In the device, the azimuth loss effect is not sufficient for low frequencies. Since the low frequency conversion carrier color signal of the vAAl1 rack is mixed into the reproduction signal as a crosstalk component, the recording/reproduction 0
), the phase of the color subcarrier frequency of the low-pass conversion carrier color signal of the NTS C method or the PAL Zj method is transferred to w1190'Jtl23u i'l ( For example, refer to EVA, Japanese Patent Publication No. 55-32273, 1.1 Publication No. 56-9073), or only the low frequency conversion carrier color signal of one of the adjacent bidet A1-racks has its phase inverted every 111 times, etc. There were problems such as the need to take measures against crosstalk.

Furthermore, when recording and reproducing SECAM power type color video signals using the above-mentioned azimuth recording and reproducing apparatus 'C', since the low frequency conversion carrier color signal is a frequency modulated wave, the above-mentioned measures against crosstalk must be taken. Although it cannot be applied, the horizontal iUJ signal recording positions are aligned in the direction (track width direction) perpendicular to the longitudinal direction of the adjacent bidet first racks (so-called 11-line recording). ), and the modulation signal components of the low frequency-converted fading signal, which is the frequency modulated wave, are approximately the same. In this case, the frequency reproduced by adjacent tracks of the above ILC range changing 1l12 color sending signal is correlated with the color video signal components at 1 field interval, and the modulation signal component is Since almost the same items are recorded side by side, playback 1 to easy low frequency change J? 11g1 color transfer (f
The frequency is approximately the same as the frequency of signal j, and since the frequency of signal beam 1 due to both signals is close to zero, the influence of the cross is negligible.

However, when playing back a magnetic tape with a 1-1 rack pattern recorded in a 1-1 arrangement, the S[
CAMh-type low-frequency conversion carrier urgent message: The carrier frequency of J is different. There is a problem in that the azimuth recording/reproducing force formula cannot be used to overcome the error because it appears as errata on the preview screen.

On the other hand, recent advances in semiconductor technology, R&D technology, and small parts technology have made it possible to improve the image quality and quality of recording and reproducing devices, and to make devices smaller and more lightweight. It has become. In order to make the FLFF smaller and lighter, the size of the cartridge and the reduction of the drum diameter had a significant effect on the size of the unit, and in order to secure the recording time for small cartridges, it was necessary to make the tape run closer. In such a compact and lightweight recording and reproducing device (in order to obtain high image quality, a new recording and reproducing method other than the above-mentioned low frequency change l!/! recording and reproducing method) is required.
) expression was required.

Therefore, in order to meet the above requirements, a variety of recording and reproducing methods have been proposed, one of which involves FM demodulating the carrier color 4ti signal and compressing the 19 and 2 types of color difference signals between stations. At the same time, the luminance signal is also compressed on the time axis, these signals are time-division multiplexed, this time-division multiplexed signal is frequency modulated and recorded on the recording medium, and during reproduction, four lines of signal processing are performed, which is the reverse of that during recording. C
The playback output of the original standard I11 color video signal is 1g.
There were 48 types of recording and reproducing devices (for example, Japanese Patent Application Laid-Open No. 1983-
(Refer to Publication No. 5926"F3). This recording/reproducing device takes into account the difference between the bands of the luminance signal and the color difference signal, and uses h of the color difference signal, which is a force signal with a narrow range of -!1, during the horizontal blanking period. In order to make it possible to transmit the color difference signal within the period of 11", the color difference signal of -11" is approximately 20% of that of 11-1! The 1h axis is compressed between Ij and 1h, and from the point of view of band utilization, etc., it is advantageous to use approximately 80% of the 11-1 period to occupy the same bandwidth as the 1h interval chrominance signal. The time axis is compressed and transmitted between % II, and the two color difference signals are transmitted as line sequential signals alternately every 11-1 with a time division factor ipL, and this signal is supplied to the FM modulator. this[
The output No. 13 of the M modulator is recorded on the magnetic Arp shade, and during playback, the Iz No. 1 process is performed in the opposite direction to the recording 111, and the reproduced color video a! The IM was created based on the record of the uf issue (11).

According to the time/rex method for transmitting such time-division multiplexed signals, there is no period in which the luminance signal and the color difference (; 7J type color video signal like Terumai "
Band-sharing multiplexing is performed for each of the 1 and 1112 transmission signals.
Luminance signal 5 and color difference that may occur during transmission
Mutual interference between -t'+ 1: There is no interference, and NTSC system, PA I-7'JZU & HSE CAA4K (b in any case of color video signal) 7jimass recording and reproducing system I-1 by the recording and reproducing device of
It seems that it was recorded on the 1-rack of ilG, and the 1-rack of b1 has 11.1 minutes of VJ multiplexing (G is azimuth JU). cl [1 and recorded in the form of a frequency modulated signal ζ
Therefore, due to the azimuth loss effect, the 1-1 stroke will not occur as 1.1 and /V, and the above-mentioned cross-stroke pair A (B is unnecessary, and the 7111 picture purchase of the high dividend iQ) will not occur. is obtained and becomes 4'.

Furthermore, in both the time axis compression IQ No. 1 and the 111 axis reduction color difference I No. 3 which use the time brex method, the energy in the low frequency band is human, and the energy in the high frequency band is human. Since the signal has a signal form suitable for frequency modulation, the modulation index can be large and the signal-to-noise (S/N> ratio can be greatly improved). , J, Furthermore, it is possible to almost completely remove the tU raw time axis fluctuation when extending the time axis, and the reproduction image quality of the J method is significantly improved compared to that of the low frequency variable single arrow recording and reproduction method. Zuru ga 'C monkey.

(Problems to be solved by the invention) However, the f+i recording and playback of the conventional Timebrex 6 type [
The device extends the time axis of the 111 pressure 111 pressure color difference signal between 11 and 1 during i17 generation and the 111 pressure 111 pressure color difference signal between L J, Y l1il due to the completion of 2 records.
When the IIJ raw video image signal jrI is applied to the 1:1 pulse, the correct phase r: The address is written to the memory element.7/The address counter is set to (First Jul version) It is necessary to do so. However, when the address counter is set to 11 by using the L1 pulse, the 1 code operation becomes incorrect, or the load is executed at the 101 position. There is a possibility that it will not work.

This J, the sea urchin road is the same as the first one, and the noise is shining, and the color difference is 13, ftj->j
Tonosuke 11 Purpose 6 + G is misaligned (Color misalignment occurs on the screen, 711. Blurred phenomenon occurs, etc.) - A good reproduced image is caused by disordered edges. had the problem of not being able to do 1 [!].

The present invention is based on the time axis n-reduced color difference (;, bow and 1 [,
1 axis compression brightness: 1 bow is stored in the memory element to store an address in the memory element when moving between the toy axis offshore/f. )l I-> IOJ i'lf -IM component guide, the thick component of the luminance signal component is tracked by a normal television receiver, and the color difference signal component is 1 person's worth of water 51' synchronization (evening on i issue =
The objective is to solve Problem 1 +A-, which will be referred to as No. 18, which follows the same way as the luminance signal component.

(Lower row for determining the problem) In order to solve the above problems, the present invention
The luminance signal and color signal g of the signal are each compressed by 1f on the time axis, divided into 11.1 parts, frequency modulated and recorded on a recording medium, and the modulated waves recorded on the recording medium are recovered; +r, +
After Lk 11.1 Masuke Oki 1 (performs and reproduces) JC There is a recording and reproducing device C that performs the video signal II, and when reproducing 111
Between l1ll II-11ii color X- Shina 11,1 between 11
1. The time axis without 11 expansion is restored.1. : An address counter that supplies a predetermined address to the memory thread used to obtain the r11 live review update, and a comparison output from the address counter (No. 3 and water i'lliJ).
A comparator that compares which phases and outputs a phase error signal corresponding to the phase error signal, and a low-frequency component that outputs a phase error signal corresponding to the phase error signal. And, the output No. 7 of the low-frequency 4-wave EJ is used as the control number 1g, and in response to the control signal, the self-turn signal is sent to the address counter U (consisting of a power supply 11 and two controlled oscillators). 1-S・
L1 is configured as an IM circuit, and in order to avoid following the phase shift signal J, the horizontal synchronization input signal supplied to the address counter is
-111 to 3 of the 3 bows and 11 et al memory 1fl
di j-'s il: Insert state and read vN state are cut off (1.1 lid formation 1 so that the relationship between positions is kept constant)/, knee 0's ('').

<Example> Figure 1 shows the record mountain achieved by applying the present invention/l 1! ,,ii
I received an example of a family tree of Zoroptera. ,J,A,-Record 11's movement 1'1 will be explained. Fig. 1 smell - (, six-horned prostitute + rl + = entered example 1) Δ [method Ka-ei 1! 7! The brightness signal components are separated into 1111, 1111, 1111, 88, and 88 components by the data reader 2.

Decoder 2 added 111+1 to Elbow 1 degree Shinkyu II 1.
! Switch circuit 2 connected to I8 side with i&if completed [
through U lt (supplied to bandpass filter 3, and △1 from low-pass filter J3); (entered into Z5,
li'il ffJ is manually powered by circuit 6, and 1l for the same period
Same l! by 111 circuit 6! IJ Shinzuki is sent out by Sono 1 Sen. This synchronization signal (J controller 1~1-1-Lubars light 11
;HH+ Input to 7.

−)) , Δ1. ) Human horns are added to the transformation device 5.
ni J, Reno' No 1' Goo Digital Change (Subjected Connection,
Random Akbis Messiri (RAM) 8 and 9 people are supplied. :1 pulse generator 7 supplies a large amount of generated control pulses to AD converter 5.15 and DA converter 11°18.37 by synchronous IJ supplied from synchronous R1 circuit GJ:. In addition, the horizontal synchronization (L'+) with a width of about 4 μS and 3 hairs was converted into light, and the pulse of each scale was inputted to M8.0.16 and read out as a clock. The signal is emitted at a predetermined frequency fminc C1 and at a predetermined return frequency.

? If I, = 1nt(''-le pulse generator 7 is I
One of I A M 8 and 9 has, for example, 16 M
l-I z 111 insertion [-1 pulse is supplied to write an 11-1 minute pyroxene signal transmitted in a video period of 52 μs into one of the RAMs, and at the same time, for example, 20 M l-l z readout 1'', pulse, horizontal open 1 which will be described later from 11-1 light! IJ signal and 1
During the period excluding the transmission period of the f1 column of the time axis 1f reduced color difference signal of 1-1 minutes, the time axis compressed color difference signal of 11-1 minutes (52 μs) is supplied to the other RAM from immediately after the sending path Y, and is sent to the other RAM. The pyroxene signals for the previous 11'' stored in the RAM of 1 are read out. This [<ΔM8 and 9 readout operation j4+insertion operation etc. are crossed every 111 times n(J
output side 0) of RAM8 and 9
2, fIll path 101J, 2 + pulse generator 7J, readout movement by pulse of J pulse, △I'vl 8
Or 00 out, select No. 1 II <'J J5) to IJ
J (Since it is moxibusted, /l, 1 from the switch circuit 10
5, lt, '1 ff+h compressed luminance signal is information +-
11 missing 2.8% <taken out intermittently. This 11
Between TE i1+b Li reduced luminance signal 13th) J
2.

The demuter 2 uses a bandpass filter <IWI not shown) to change the frequency of the PAL color video signal h11! J ilrζ'C - A certain color scheme is divided into minutes N (
(removal, hello filter and FM demodulator)
The color difference signal (R-Y) and <13-Y) are outputted through a large number of signals (13-Y).The output from the decoder 2 is (13-Y
) and (J sumets/13. Six 11 pulses are applied to the switch 13, and the connection is switched by this tarok pulse. Therefore, from the switch 13, The line-sequential color difference (a), which is synthesized in time series with lN1E, is output and supplied to the ΔD converter 15 through the switch circuit 14 connected from the center to the H terminal R side.Switch circuit 1/
Is the 1-line sequential color difference signal output from I ΔD conversion? +:
After being digitally converted into "Riano 1" on J 15,
It is provided to RΔM16 t8.

RΔMl (3 is within 11-1<=(3/lμs)'c1
, ↓, The line sequential color ^' signal transmitted during the 52 μs video period is converted to the control 1-roll pulse generator 7J: for example /IMII7's 1!
: For a certain period of time after inserting and inserting (for example, 1.6μS)
) J: For example, read out the signal at 20 MHz and set the time to 1,15 by 11 pulses.
ii Read out the compressed color difference signal (therefore, one readout period is 10.4 μs), RAMIG/+ outputted time axis pressure 1lIi E-X- signal (at 1 -Y color difference signal and 13-Y color ff-+a is outputted in line sequential order (13) (13-Y color ff-+a is output via line-sequential '17) A
It is input to the converter 18. The 111-111111-111-contracted differential signal +J converted from digital to analog by the DΔ converter is input to the switch circuit 12.

The switch circuit 12 outputs the above-mentioned 114-question axis C1 volatilization signal and the horizontal synchronization signal of about 4 μs width taken from the control 1 to I]-Rubalus generator 7. According to the output control port of the device 7, +t'I minute υj, the switching control is applied. This switch circuit 12J: extracted M-division multiplexed signal [
j Discrimination signal Q (supplied to the refueling circuit 19, here
A timing signal for discrimination, which is generated by the timing signal n for generation of C discrimination based on Jjt, is added to the pulse. This determination timing signal (Akl:] '7
6-deck level +a＞”+)+:l difference signal (13-Y'
) To C! :A timing signal to avoid discriminating the transmission JZ line of ffe number (11-Y), for example, a color difference signal (
13-Y) and the color difference signal (R-Y) are generated at different constant levels of pulse width (
) 7ri 1171 - ink level) pulse bj + gog.

The above-mentioned J, Uni, Rokuryoku terminal 1 to 1〕△L sword) type color image (when a bow comes in, the timing signal for discrimination is 1l-N-64μs from the oil circuit 10) is different for each. The timing signal for determining the pulse width is brought forward, and the axis H-reduced color difference signal (+'<
- Y ) or (+3- Y
, the 5-axis compressed color difference signal is transmitted line-sequentially at 1/111
L11 multiφ1. ) The shish is taken out. At this time 31j
TASHIN KAI;ZIJ,,SIRI''-NF7・cis circuit 21. Small Wight Bicle/＼le Clip Circuit 22. Clamp times 1i23. The FM modulator 2/I, the high-pass filter 25, the recording amplifier 2GJ, and the recording head 27 are supplied to the recording head 27 through the known recording (1) processing circuit vIS. recorded on the magnetic arp 28.

Next, the operation during reproduction will be explained. At this time, the switch circuits 2 and 14 are connected to the terminal P side. The 11/1 division multiplexed signal recorded in 8 formats of the wave frequency modulated wave 1i'' in the reproducing head 29 is recoupled to the magnetic field ``28'', and this III frequency modulated wave is output to the iQ raw amplifier. 30. Inikora rsu 331. High frequency noise filter 32
．． FM demodulator 33 and de f1 horn!・cis circuit 3 /I
J, Rinaru Publicly Known Regeneration 4. f +, ; The C reproduction time is made into 121 multiplexed 1a months through the processing circuit. Of these '1-1
11 split'3 small signal is connected to terminal P (switch circuit 3 The signal supplied to the circuit 6 is supplied to the AI converter 15 through the switch circuit '111 connected to the terminal P.

Δ1] Converters 5, 1λΔM8 and 9. switch circuit 10
and 1] △ variation; i31 'Circuit section consisting of I (J,]
] Based on the output signal of the output IJ pulse generator)
Reproduction I that the axis between the CIS has been expanded and returned to which time axis
Generates a pity bow. Here, when one of r-, R, AM 8 and 9 performs an ill insertion operation for the time axis Eji ill mark signal of reproduction time division multiplexing No. 15, when -C occurs, the other performs a read operation, Also, RAM8 and 9 are I Ll
It is the same as when recording that the reading operation and the aging operation are performed at alternations with the fi.
In Ml-1z, the repetition frequency of the readout L1 pulse is, for example, 16M117r, and the time axis is extended to C5/4 (tl'<'t i time axis 1
[Reduced or expanded time axis] Regenerated bright signal is stored in RAM8
and every 9 or 611-1.

On the other hand, Δ]] converter 15, RAMs 16 and 35, data selector 17, DΔ converters 18 and 37, ring counter 3G, achromatic level detection section 3 E'r J,
The circuit section performs C regeneration 11.1 division multiplexing 1.1 based on the output of the 21-ton 1-1-rebars optical generator 7. ; Expand the time axis compressed color difference signal by 5 times along the axis and output the original line sequential color difference signal.

Here, when the time axis compression 1 (R-Y) color difference signal is input to the ΔD converter 15, Δ1] change 1 &:iH'I
Time input in 5 11N1 + Compression difference 4'; fU
A certain time 'fib Ll contraction (RY) color difference signal is △D
After being converted by converter 15 into 7 no 1'',
Synchronization 1.1 days are always input into AMIG at regular time intervals.

RAM 16t, L, e.g. 20 M l-l z O
), 1 sagomi [] regenerated by tsuku pulse between 1'1 +
11+ +1 reduction color difference f;M? ': Digital signal of 0
1 input, 4 M Ll z readout 11 pulses, time axis extended to 51B (Il, lJ axis restored (Zunawara Il! i between ll + l + month) 111 minutes (] Sukema axis expanded) reproduction (II-Y) color difference 1
Read the digital signal of No. 5, 1 This read j
'Digital signal (UL via data selector 17)△
Conversion 1: When output to i 18, RAM 3
4 M l supplied from ring counter 3G to 5
-l Write to the z paste with one pulse.

Next, when the 1 office axis compression 1 (13Y) color difference signal is input to the △l] converter 15, the time axis J1 reduction (B-Y) color difference signal 2] is input to the ΔD converter 15r j゛After digital conversion, the above-mentioned n, j axis compression (+'<
-Y) Like the color difference signal, it is input with a clock pulse of 20 tvl Hz, and it is input with a clock pulse of 4 M l-1z and 11. The axis between '7 is extended to 55 yu and 0. +1
The interval axis I was also changed to Σ element.

(That is, 11. j I! ! The signal is read out as a digital signal of reproduced (B-Y) color M<Ii (time axis expanded by I N + compression amount). This read digital signal is inputted to the i'-direction detector 17, and outputted to the data collector '17 (J:l, 1<ΔM 35). It was recorded (+'
? -Y) The digital number 1a of the color difference signal is sent from the ring counter 3G (1ζ feeds 4 to 4 = + 117 glue 1-
One pulse is read out and output by the data selector 17 to the DΔ converter 181c.

J, t, Δ1) One digital signal of 1=time axis compressed color difference signal f3 outputted from the converter 15 is inputted to the j'taloma block level detecting section 38.

Achromatic level detection section 381. L, human-powered]
]! The i axis compressed color difference signal is (RY) color difference signal, but (
B-Y) A timing signal for discriminating the color difference signal is supplied to the timing input terminal for discriminating which is the third input terminal of the encoder '17 and the encoder 39. Next, extract the digital signal of the Achromatic book level at a certain time position from the synchronization signal, calculate the average value of the level of this extracted signal, and calculate the achromatic level. It is output as a pulse signal to the Cγ-ta selector 17.

This puff number 1216 of chroma bootsk level is -J
2; J, S, (R-Y
) eX: 1] Δ change i as a signal weighted to the f running level of 132 color difference or (B-Y) color difference
%:::118 or 1] The horn is output to the Δ transformer 37 and in.

1] (RY) color difference 4c input to the Δ converter 18
No. 4 digital (F1 (J1) △ 1-variable device I E'S
After being converted into digital-to-analog L1, it is supplied to the (R-Y) color difference 1Δ input terminal, which is the first input terminal of the digital converter 39, and is converted to 1). The digital signal of the (B-Y) color difference signal input to the converter 37 is converted into a digital-to-analog signal by the A converter 37, and then
<B-Y) color difference 1- which is the second input terminal of the 1-da 39
signal input terminal.

11α The line input to the input terminal of 1.2.3 described above is input to the input terminal < r −) “C frequency modulated wave. The transmission of the frequency modulated wave iX is blocked only during the period of , and 1% is applied to the power test by C1p△, and the frequency modulated wave (lζ) is generated. Brightness Ij
The signal is mixed extensively with the synchronizing signal of the device 7J, and is output to the output terminal 40, where it is converted into a reproduced color video signal conforming to the PAL format.

In general, when a recording/reproducing device reproduces I, it contains a day IJ jitter component, and this jitter component is added to J3.
An overlap occurs between the ff signal component and the m color feeding signal component. This deviation can be broadly classified into the following three types. The first is due to jitter generated by the 1Bt mechanical system of a relatively low frequency recording and reproducing device. If the locked loop (1) circuit malfunctions and there is a jitter that appears at the top of the screen, and thirdly, if noise is superimposed on the reproduced signal itself, If the synchronous component 111 circuit malfunctions or there is too much noise on the 1.1 axis Jf 1 color signal, it will cause a steep color No. 18 Cowan. As long as the axle load f 1lii between [, Yohaku yells at Jinginazura.) yells.

In order to solve the above-mentioned problem, for example, a device such as a time base filter may be used, but this device is very expensive and cannot be used for consumer use. There was a problem.

Below, the recording and reproducing device zJ゛ of the present invention /11!
For the main part of example i - (drawing p(ljf,j (,
The middle of the day is bright.

FIGS. 2 to 5 are diagrams for explaining one essential part of an embodiment of the present invention.

By the way, the recording/reproducing device V! shown in FIG. In I, the RAM is used when expanding the time axes of the time axis II contracted brightness mark signal and the time axis compressed color difference signal during reproduction.

The frequency of the 1-1 ivy pulse is changed when loading data into RAM and when reading it out.
When reading the frequency of the clock pulse when inserting 1-1 clock pulse, the frequency J of the 1-1 clock pulse becomes higher, so that the time axis of the input time axis J earth reduction signal 8 becomes longer. . For example, the intercostal II of the time axis compressed color difference signal! lI
When executing 11ll, the address counter increases [17 pulses (for example, 20 pulses)] to 1λΔM
MHz glue [1 pulse] 240 times/kun 1
-(12μs), add 1 (ΔM + t) to I
When the 7 l-res counter finishes counting 2/10 pulses, the j7 address counter counts 1 pulse (for example, 16 M l-1z Nori I-1 Tsuta pulse) 208 times. (52 μs>
;l reads from 17AM J: Sea urchin
Set the It1 axis to N1 (and fold the reproduced color difference (i-bow).

However, as mentioned above, the address counter needs to be loaded (address B becomes active) once every 11-1, and at this time, the phase of the address counter's 1-1 ivy pulse and the load pulse are different. ＜r・ノ When the counter is [
1- not loaded, L effect)-c2 degree load jζ1,
:su, originally a-nizubeσ temporal position J:su1'1ri1J
There is a risk that mist or mist may occur at the point where the pulse is shifted. This mistake 1”-
When the card is played, horizontal shift of the screen, disturbance of the ground azalea, and jamming occur. Also, the chic ingredients in this joke (J) make me very excited.

I', 'i Jl k I
J ri 1j Tunpulse and a-dobalus become 71 (" ly + 14 J, it is necessary to urinate C'.

Now, load the address counter with a constant value to the RAM that expands the intercostal interval II+11 of the time-axis compressed color difference signal at the position of the horizontal synchronization signal during vertical blanking +11J, and then In the current period, the address counter operates like a ring counter that performs one operation and supplies the address to the RAM (
'+sake, read out the 1st stroke of 17ΔM.

Below is a trillion J, Uku [timing 'U-11! i
A circuit used to expand and cover the time axis of the interaxial compression degree signal will be explained with reference to FIG.

FIG. 2 is a system diagram 1 on the 1st to explain the operation of IIM axis compression f4 + time axis expansion of the melon signal. In Figure 2, the same components as in Figure 1 are denoted by the same symbols (J
L,'? :The explanation is omitted. 41 and 42 are address counters, and /13 is Goo 1-Circuit C.

△1) Ana D goo in Hen 1 Ka instrument 1) Digital Hen 1 Momme playback 11) Between 1ii + Ji: flii elbow + Pesantan is supplied to RAM8, 9, in β2 light in Figure 1) As mentioned above, the time axis is expanded by line <14, and the time axis is compared to the reconstructed reproduced brightness fα signal.

When performing this time axis extension by 11, 20M l-1z and ' necessary for writing to and reading from RAM8.
The clock pulse of IGMI-1z (denoted as CK in FIG. 2) is sent to the address counter/11. /12 on ll
I am paid t.

In addition, the gate circuit/I3 is connected to the L-1
, bow (marked as V 5ync in Figure 2) and Ho 1
ifiYIll] in Fi (l-l S in Figure 2
y n c) is supplied, and goo 1
~Circuit/I 3 +, L IPtI'+ 1111th period Nizuki 8 When horizontal synchronization signal is input to ノ(, tsJ, su, vertical') m'lA I device for horizontal synchronization signal during erasure period address counter 41. /12 to 1-1-do Shingetsu (2nd
1-oad in the figure) is output. This 1]
- address counter 41.4:l by deG, f\3
1"-coded at a constant In.

1-) Hotaj, Uni Address Counter/11. /12
1 = 1 - J:S, 1(ΔM(3, 9) Since the reproduced bright signal output from 9 is reproduced at a certain time position with respect to the horizontal open +91 signal, , J mentioned above.

The address counter 41./12 becomes + and t −i at the position where the horizontal synchronization period (1) during the vertical blanking period arrives.
= the period during which (P) is the force that disturbs III a few times (, between other l1, [J input signal between Il1+lil+ is 1,25
In this case, thick component b
1.25 (Q is different from this, but this is common);
) circuit can sufficiently track the bright spot signal, so that the bright spot signal is well p'f 'I:.

Next, with the above-mentioned timing, the 77 dress counter is loaded when expanding the time axis of the reduced color difference signal in 11), and the reproduced color difference No. 13 has a time axis of 54 (r). Since it is expanded, the jitter component b 51i'f is
The phase loop (PLL) circuit 'C'' of a normal (ordinary) revision receiver
Because of this, a good quality raw image cannot be obtained.

For example, it is conceivable to use a circuit like 11 shown in FIG. 3 to reapproximate the image.

β1 will be explained with reference to FIGS. 3 to 5 below.

Fig. 3 is a block system diagram for explaining the time axis expansion operation of the compressed color difference signal between ta and ta. Non 1” Tsuku family tree, Figure 5 (△) to (
G) is a diagram for explaining the operation of FIGS. 3 and 4.

There is J3 in Figure 3, and it is opposite to Figure 1) ^1 Seian 4 (J
The same reference numerals will be omitted and their explanation will be omitted.

In FIG. 3, 44 is a comparator in J3, 45 f; 1. -Bass filter (hereinafter referred to as LPF), /IG Ll
, y[If controlled oscillator (hereinafter referred to as vco), 47
14 is a counter, /18 is an address counter, and 7'19 is a phase 1-1 circuit.

Not shown in Figure 3 J: Uni comparator 44, L [] 1" 45, V
A CO 46, a counter 47, and an address counter 48 are arranged horizontally to form a phase 11 constructed loop circuit/19. Address counter/I81Jfly 1f
ll 1! h Jf color reduction difference Ig'? t nol+l'f
Get along well with each other! , / (r+r This is a counter that supplies 1 address to the RAM 10 used to calculate the raw color difference signal by 1!7, and the signal 8 output from the address counter 48 and the previous 1"II 6/lr + U signal for the same period. What comparator/l/
Comparison i! 344 +J A is supplied from the F-res counter 48 and has a serrated shape as shown in FIG. 5 (E). Let's divide the wave into the synchronous classification 1 circuit 6 supplied from the 4th circuit (△) in Figure 5.
Figure 5 (F
) shown! I' J: )' 5th pulse holding 3 pulses
Phase W as shown in figure (G): Difference signal (signal obtained by converting phase error into voltage form) 'J L-PF /IJ
51, a relatively high frequency noise component contained in the supplied phase error signal 23 is removed, and this signal 18 is supplied to the VCO 4 (3). \/ C0461J input 1.: Frequency corresponding to voltage value < 80 tvl Ll z Iri frequency)
Therefore, 11 pulses (l+j) are supplied to the J counter 117.

Counter /17 is a counter that divides the frequency of 1.1; by 4, and C1, that is, approximately 20 M l- which is the frequency of approximately 80 M l-l z Nori 1-1 pulse supplied from VC04G divided by 4. This is because the 1z and L1 pulses are output. This clock pulse of about 20 to I l-l z is supplied to the address counter 48 IJI.

The address counter 48 and 1<ΔM1G are j− in FIG.
Sea urchin is made of 4+4.

In Fig. 4, J3 has 50, 51.52 counters, 53 Fritzoff 1-1 Tuzo circuit, 54 NAND circuit, 44
is a fillet tabbutt.

The counter 47 /J'6 shown in FIG.
(Z) is the counter 50, 51 + r
The clock pulses of the counters of each i2σ piece f are supplied to the counters.

Here again, when ΔM 16 is in the in/out state, for example, a level signal of the level shown in FIG. -), N A N l) Output IJ of circuit 54,
When the I-level signal is output (-1 is applied to the I level of this 1-level, the counter 51 It) 2 starts the counting operation. 41'J3, counter b 1 , b
21J and 'c each have a counter C of 4b1[, and counters 51 and 52 are connected so as to operate as tJ and 8bit counters.

Counters 51 and 52 are 201~=I Ll 7 glue 11
The Tsuku pulse is shown in Figure 5 (C).
When the IJ counter l-1J is for O pulse (12 μs), the Ritz “Le Carey” (write/read 1 sword 1 arrow signal)
is the counter 52 and the flip-flop circuit 53 is J.
Output to the terminal. The flip-flop (Q terminal output of the second tube circuit 53) is inverted as shown in FIG. 5(B).

In other words, the RAM 16 enters the read state.

By the way, the counter 50 has 1 co-supplied C and 20M l
4fvl, which is the frequency of the clock pulse of l divided by 5
There is a counter C that outputs 1 cock pulse of l-1z glue. The Q GMi of the flip-flop circuit 53 outputs a signal of 1-level as shown in FIG. Multi 3 is supplied, 77, Ll
Outputs a level signal.

At this time, 20 MIIz glue 1:1 Tsuku pulse is force r kunta! 51 and 52) (the counters 51 and 52 operate and the callan 1- is fj<i:i,
Counter 5'l,! :12 is 208 pulses k [Tsuku1
” Counter 52 counts Ptg pulses.
Similarly, when in a busy state, one ripple is output.

J: A force of 1 as shown in Figure 5 (C) and <1>
51.52 is the same as 20M1-1z glue +:+ Tsukuha/Response for 1040 pulses (52 μs).
1M I-I Z (1) riI:I tsu') pulse wo 208 c) Ii minutes (52 μs) [This means that it has been counted. .

When the counter 52 is in a state of fortune-telling, 1 Ripple 1 Nitori is sent to Noriff 1F and 1 Tsuzo 11λl WiI53
When J is supplied to the J9 seat, the output of the Q output of the Noritsubu 81 circuit is reversed to the J shown in Fig. 5 (Δ), and C becomes L level again, so the C and counter! 31゜52 is A1 for Tli loading of RAM 'l G.
-I'm going to post a reply.

J, t, Nokta game 1 shown in Figure 1! i
5 tJ, outputs a constant value signal 5J to the comparator /I/l shown in FIG. (In Figure 4, it is marked as gate 1.) The above J, sea urchin comparator 4! I, Ll] [245, V C
046, counter 47, address counter/I8 (I)
By forming 91, the horizontal synchronizing signal supplied from the Ilj division circuit 6 is changed to the address counter 48 by the inversion timing ( iQ with 4 insert readout switching timing) 41] III section is always 1+
A: It drips.

Therefore, the disturbances caused by the above-mentioned mechanical system of the recording/reproducing apparatus, such as irregularities, misalignment, and lateral deviation of the image, are improved, and the operation of one circuit during the synchronization period due to noise is prevented.

In addition, in order to prevent malfunction of the synchronization component F+1 due to the noise generated during head switching (J, during head switching, the synchronization separation circuit/J
The comparator 44 becomes a bold state as the same signal supplied to the comparator /I/l is not input to the comparator /I/l.

Further, the 111 axis compressed color difference signal supplied from the ΔD converter 15 is subjected to time axis expansion in the same manner as in FIG. 1) Since the Δ converter 37 outputs the signal, its explanation will be omitted.

To J:) of J-ho above (Fig. 2, 15-2)'! J shown in /11yl, 5) Sukema axis compression A11 good signal and time axis moon color difference 1. Construct a circuit that extends the time axis of 13; This becomes a signal that includes jitter components in the range that follows jIj (−), and it becomes a signal that includes jitter components in the range that follows iU The Phase 1 lacto loop (P L L
, ) Since the signal is output as a signal containing jitter components within a range that can be tracked by the circuit, a good reproduced image can be obtained without the lateral fraying, edge disturbance, and jittery snow in both images caused by the above-mentioned jitter components. .

d3. In the μ2 brightness of the embodiment described above, it is limited to reproduction (as explained in the first system, the present invention is a reproduction system). When the image is from a recording/reproducing device, that is, when recording, the present invention can be applied to the recording system to improve the quality of the image.

In addition, in the explanation of the above embodiment, PALZj type color image 1
Although an example has been described in which recording and reproducing of an image signal is applied, the present invention is not limited to this, and may be similarly applied to the N'l-S06 method or the S[CAM method. It's not good.

(Effects of the Invention) The present invention has the configuration as described above, and when reproducing Time No. 7179213 containing C jitter components etc. There is no disturbance or smudging, and it can be used as normal
The advantage of machine C is that it is possible to achieve a good reproduced image at a relatively low cost with a comparatively simple 4-channel configuration.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram of an example of a recorded Nj neck to which the present invention is applied. FIGS. 2 to 5 are diagrams for explaining an embodiment of the present invention. Figure [Yo time axis L [shrinkage 1
σ (time 1111+ of the number 1 + Z to explain the operation of Nakaai. System diagram,
FIG. 4 is a block system diagram for explaining the operation of the address counter shown in FIG. 3, and FIG.
1 (G) I, the movement f' in Figures 3 and 4 (4d2 There is a diagram to clarify. 4.1.42...Address counter, 43...G1~Circuit, /I /I... Comparator, /+ 5-D-bus filter (LP[-), 4G... Voltage series 611 oscillator (VCO), 47... Counter, 48... Address counter, 719...・・7-cho-zu locked loop-1 time if'/f (1) 1.,, l-) special ¥1
Applicant: Victor Japan (11 Ceremonies? 1-Representative 11 Odori Part 1 'Shii 1.-.Shii/Procedure 1 Yamashi 7+13 (Nori] Entry) Director General of the Special Designation 1 Agency Wakasugi Kazuinu 1.11 I 'I indication 1982 ([Patent J/1 Application No. 205632 2, later name of invention record i+7 production device 3, relationship with amendment consideration 1'1 Patent n'r applicant 11 Kanagawa Bokuyoko ( 8\33 Moriyamachi, Kanagawa-ku, City] River 1
12 Tsumeji name (/132) Japan Victor Co., Ltd.!
111 Sum 59 ([1J13111 (Shipping [1) 5, drawings subject to amendment]

Claims (1)

[Claims] The luminance signal and color difference (L') of color video No. 18 were compressed in time axis, time-division multiplexed, frequency modulated, and recorded on a single recording medium, and the modulated wave recorded on the recording medium was demodulated. In order to use a recording and reproducing device which performs time axis expansion after that and reproduces the raw color difference signal by 1q, and performs time axis expansion of time axis compressed color difference t8 during C1 playback, and reproduces the reproduced color difference signal whose time axis has been restored by 1η. 188 children to use the specified atto 1
The phase of the address counter supplying the signal C1ff?7 is compared with the phase of the comparison 1a@ output from the address counter and the horizontal open 1i11 signal. a comparator that outputs a phase error signal corresponding to the phase error that is input, and a low-pass filter to which the phase error signal is input; , a voltage controlled 11 oscillator which supplies a clock number 915 corresponding to the control signal to the 6U address counter constitutes a phase single loop circuit f>, and a clock number 915 corresponding to the control signal is supplied to the address counter 6U. ii to follow the phase error signal, the relationship between the temporal position of the arrival of the horizontal l1ilii signal and the temporal position at which the re-insertion state and read-out state of the storage element are switched is as follows. J: A recording/reproducing device configured as a constant.