CN1052583A - The compensating circuit of image videocorder colour signal under multi-functional slow-speed mode - Google Patents
The compensating circuit of image videocorder colour signal under multi-functional slow-speed mode Download PDFInfo
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- CN1052583A CN1052583A CN90104363A CN90104363A CN1052583A CN 1052583 A CN1052583 A CN 1052583A CN 90104363 A CN90104363 A CN 90104363A CN 90104363 A CN90104363 A CN 90104363A CN 1052583 A CN1052583 A CN 1052583A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/87—Regeneration of colour television signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/86—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded sequentially and simultaneously, e.g. corresponding to SECAM-system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/87—Regeneration of colour television signals
- H04N9/89—Time-base error compensation
Abstract
The compensating circuit of the colour signal of a kind of visual videocorder under multi-functional slow-speed mode, it comprises carrier frequency checkout gear, carrier frequency choice device, carrier frequency compensation identification device etc.Use this compensating circuit in the visual videocorder of Sequential Color and Memory system video tape recorder etc., just need not under multi-functional slow-speed mode, to weaken colour signal, compensate in the carrier frequency of the colour signal of every 1H checker remaining according to carrier frequency, thereby resetting draws also can reveal good colour again under multi-functional slow-speed mode even make.
Description
The present invention relates to the compensating circuit of visual videocorder colour signal under multi-functional slow-speed mode, be particularly related to visual videocorders such as video tape recorder record picture intelligence with slow-speed mode high-speed replay videotape, the videohead crosscut scans the videotape magnetic track, carries out under the variable-speed replay colour signal occasion, and compensating circuit, the present invention of the colour signal of compensation after resetting also are particularly related to the compensating circuit of sequential-simultaneous system formula (Sequential Color and Memory system) or TV broadcasting system (MESECAM system) video tape recorder colour signal under multi-functional slow-speed mode.
In general, when the video tape recorder of tool slow-speed function is carried out variable-speed replay to the videotape that records picture intelligence under the slow-speed mode, can produce crooked (skew), i.e. therefore the phenomenon of the horizontal-drive signal disorder of the picture intelligence that playback is come out need add skew compensation circuit in addition.In the video tape recorder of TSC-system, because 1H(H here is the cycle of horizontal-drive signal) about the phase place of colour signal and carrier frequency all not have variation, so need not the colour signal after resetting is compensated, as long as the skew of compensation level synchronous signal cycle 0.5 is just enough.That is to say, in TSC-system video tape recorder, as shown in Figure 1, the composite picture signal of being exported from visual playback system (1) postpones 0.5H by 0.5H charge coupled device (2), detect crooked generation by crooked test section (3) simultaneously, detection signal by crooked test section (3) is changed analog switch (4), compensates crooked.For example, when not having crooked generation, select the composite picture signal of output image playback system (1), on the contrary, when crooked generation is arranged, select output from the delay of 0.5H charge coupled device (2) output the composite picture signal of 0.5H, thereby compensate crooked.
Otherwise, in the video tape recorder of Phase Alternation Line system and Sequential Color and Memory system, not only the same with the video tape recorder of TSC-system, need the skew compensation circuit of 0.5H, and in the characteristic aspect of picture intelligence, because the mutually every 1H in position alternate between+4.43 megahertzes and-4.43 megahertzes of its colour signal of picture intelligence of Phase Alternation Line system, the carrier frequency of Sequential Color and Memory system picture intelligence is alternate between 4.25 megahertzes and 4.4 megahertzes, so also need corresponding therewith colour signal compensating circuit.
That is to say that in Phase Alternation Line system video tape recorder, as shown in Figure 2, frequency multiplier (11) is transformed into the carrier frequency signaling of 4.43 megahertzes (Fsc) multiplication the carrier frequency of 8.86 megahertzes.In balanced modulator 13, the carrier frequency signaling of this 8.86 megahertz signal that is transformed into 4.43 ± 8.86 megahertzes after carrier chrominance signal (4.43 megahertz colour signals just) the balance modulation of color heavy place system output, then by filter (14) filtering in addition of-4.43 megahertzes, detect a colour signal that is reversed-4.43 megahertzes mutually, change at every 1H by the control signal (CTL) that analog switch (15) provides according to the outside, make that 4.43 megahertz colour signals of color heavy place system (12) and-4.43 megahertz filters are exported 4.43 megahertzes the next on the contrary to the output of colour signal alternate selection, compound in blender (15) and luminance signal (Y), thus colour signal is compensated.
But Sequential Color and Memory system video tape recorder has such problem under multi-functional slow-speed mode: owing to be to adopt the method that weakens colour signal to prevent to reset picture because of the colored dirt of the distortion of colour signal, thereby, can not reproduce colour on the playback picture during this period.
Here studied with regard to the pattern of the picture intelligence that on videotape, write down under the Sequential Color and Memory system slow-speed mode.As shown in Figure 3, the horizontal-drive signal of the picture intelligence that writes down adjoining on the magnetic track, its arrangement position 0.5H that each and every one staggers.Therefore when high-speed replay, videohead may jump on the magnetic track that adjoins, and the picture intelligence that comes out of at this moment resetting has four kinds of situations, shown in (A) figure of Fig. 4 to Fig. 7.
In other words, because the two spacing of the horizontal-drive signal of the picture intelligence that videohead adjoins on the magnetic track from it jumped to be picked up and the horizontal-drive signal of the picture intelligence of initial playback is 0.5H, thereby produced crooked, the carrier frequency of colour signal is in 4.25 megahertzes and 4.4 megahertz alternate, the phenomenon that gets muddled, thus colour signal is distorted.
So the crooked of generation utilizes compensating circuit shown in Figure 1 to compensate.That is to say, compensation is performed such: when appearance is crooked, the crooked detection signal of being exported by the crooked test section of Fig. 1 (3) shown in (B) figure of Fig. 4 to Fig. 7 makes analog switch (4) conversion, so picture intelligence of 0.5H of having selected output delay, rather than the former picture intelligence shown in (C) figure of Fig. 4 to Fig. 7, thereby in 1H, unified the interval of synchronizing signal.
To study below through compensating the various situations of crooked picture intelligence.The front is spoken of, under the situation of Sequential Color and Memory system, the every 1H of the carrier frequency of colour signal should carry out alternate between 4.25 megahertzes and 4.4 megahertzes, simultaneously, in the occasion shown in Fig. 4 and Fig. 6 (C) figure, the carrier frequency of colour signal is an alternate at every 1H, but in the occasion shown in Fig. 5 and Fig. 7 (C) figure, when videohead jumped on another magnetic track, carrier frequency was not but carried out alternate.
Therefore image is by carrying out playback time like that shown in (A) figure of Fig. 4 and Fig. 6, if after being compensated by the such distortion with picture intelligence shown in (C) figure of Fig. 4 and Fig. 6, owing to colour signal does not distort, just can reproduce colour well on the playback picture; And by like that picture intelligence being carried out playback time shown in (A) figure of Fig. 5 and Fig. 7, even distortion has obtained compensation, but shown in (C) figure of Fig. 5 and Fig. 7 like that, because the carrier frequency of picture intelligence is alternate between 4.25 megahertzes and 4.4 megahertzes not, thereby colour signal can not be reproduced out well.
Therefore the purpose of this invention is to provide a kind of like this colour signal compensating circuit, this compensating circuit is in the visual videocorder of the video tape recorder of adopting Sequential Color and Memory system etc., need not under multi-functional slow-speed mode, to weaken colour signal, but compensate in the carrier frequency of the colour signal of every 1H checker remaining, thereby even make the playback picture under multi-functional slow-speed mode, also can reveal good colour again according to carrier frequency.
For achieving the above object, compensating circuit of the present invention is characterised in that it comprises carrier frequency checkout gear, carrier frequency choice device and carrier frequency compensation identification device.The carrier frequency checkout gear is in order to the arbitrary carrier frequency of detection from 4.25 megahertz to 4.4 megahertzes of the colour signal of colour signal playback system output.The carrier frequency choice device is in order to be transformed into 4.4 megahertzes or to be transformed into the carrier frequency of 4.25 megahertzes from 4.4 megahertzes from 4.25 megahertzes according to the colour signal of the output signal selection colour signal playback system of above-mentioned carrier frequency checkout gear.The carrier frequency compensation identification device is used for differentiating and should colour signal not being compensated with the output signal of above-mentioned carrier frequency checkout gear and horizontal-drive signal (HS), and selects the output signal of above-mentioned colour signal playback system of output or above-mentioned carrier frequency choice device.
The carrier frequency of the colour signal that above-mentioned colour signal compensating circuit sense colors signal reproduction system of the present invention is exported is 4.25 megahertzes or 4.4 megahertzes, and output detection signal.In addition the carrier frequency from the colour signal of colour signal playback system output is modulated and filtering, their mutual conversion (are about to colour signal and are transformed into 4.4 megahertzes from 4.25 megahertzes, transform to 4.25 megahertzes from 4.4 megahertzes) afterwards, select the reverse carrier frequency of carrier frequency of the colour signal exported with above-mentioned colored playback system to be exported according to above-mentioned detection signal.
Utilize the horizontal-drive signal of the detection signal of carrier frequency and picture intelligence to differentiate that whether tackling colour signal is compensated then, just select the colour signal of above-mentioned carrier frequency through conversion to be exported when needing compensation, thereby colour signal is compensated.
Above-mentioned purpose and the characteristics thereof with other of the present invention can be more clear by the following explanation of being carried out with reference to the accompanying drawings.Accompanying drawing comprises:
Fig. 1 is the schematic diagram that adopts the video tape recorder skew compensation circuit of TSC-system.
Fig. 2 is the schematic diagram that adopts the video tape recorder colour signal compensating circuit of Phase Alternation Line system.
Fig. 3 is the colour signal pattern figure that adopts Sequential Color and Memory system video tape recorder to note on videotape during record data under the slow-speed mode.
Fig. 4 (A) to Fig. 7 (C) be respectively Sequential Color and Memory system under the multi-functional slow-speed mode colour signal through the key diagram of the crooked carrier frequency that has compensated.
Fig. 8 is the schematic diagram that has adopted the video tape recorder of colour signal compensating circuit of the present invention.
Fig. 9 is the schematic diagram of an embodiment of colour signal compensating circuit shown in Figure 8.
(A)-(D) of Figure 10 and (A)-(N) of Figure 11 are respectively the oscillogram of the working condition of explanation colour signal compensating circuit shown in Figure 9.
Describe colour signal compensating circuit of the present invention in detail below by Fig. 8 to Figure 11.
Fig. 8 is the circuit diagram that has the Sequential Color and Memory system video tape recorder of colour signal compensating circuit of the present invention.As shown in the figure, luminance signal playback system (22) and carrier chrominance signal playback system (23) detect luminance signal and colour signal respectively from the picture intelligence that preamplifier (21) is exported, it denys crooked generation and output detection signal that crooked test section (24) has from detected luminance signal detection, the colour signal of colour signal playback system (23) compensates through colour signal compensating circuit of the present invention (25) simultaneously, with after luminance signal is mixed, postpone 0.5H at blender (26) by 0.5H charge coupled device (27).The analog switch (28) that uses as conversion equipment is changed according to the crooked detection signal of crooked test section (24) then, and the composite picture signal of blender (26) and the composite picture signal that postponed 0.5H by 0.5H charge coupled device (27) are exported through selecting respectively.
Fig. 9 is an embodiment of colour signal compensating circuit of the present invention.
As can be seen from Figure 9, carrier frequency checkout gear (30) comprises 4.25 megahertz filters (31), integrator (32) and comparator (33).4.25 megahertz filter (31) is in order to the 4.25 megahertz carrier frequency colour signals of detection from the carrier frequency (4.25 megahertzes, 4.4 megahertzes) of the colour signal of colour signal playback system (23) output.Integrator (32) is connected to the output of above-mentioned filter (31), in order to output signal is carried out integration.Comparator (33) compares in order to the output signal of the above-mentioned integrator (32) that will import respectively and the reference voltage of having set (VR).Carrier frequency choice device (40) comprises balanced modulator (42), filter (43), (44), analog switch (45) and level regulator (46).It is that 150 kilo hertzs the oscillator signal of oscillator (41) and colour signal that colour signal playback system (23) is exported are respectively as input and carry out the balance modulation that balanced modulator (42) is used for frequency of oscillation.Filter (43) (44) detects the colour signal of 4.25 megahertzes and 4.4 megahertz carrier frequencies respectively in order to the output signal from above-mentioned balanced modulator (42).Analog switch (45) is in order to according to the output signal selection 4.25 megahertz filters (43) of the interior comparator of above-mentioned carrier frequency checkout gear (30) (33) and the output signal of 4.4 megahertz filters (44), and this output signal remains and two carrier frequencies of the colour signal of colour signal playback system (23) checker oppositely.Level regulator (46) is then in order to regulate the output signal level of above-mentioned analog switch (45).Carrier frequency compensation identification device (50) comprises in abutting connection with magnetic track and jumps over test section (51), carrier frequency alternation test section (52) and switch sections (53).Jump over test section (51) in abutting connection with magnetic track and adjoin the picture intelligence that magnetic track produces in order to detect when importing the horizontal-drive signal (HS) of playback picture intelligence, whether to have because of videohead jumps to.Whether carrier frequency alternation test section (52) in order to jump to alternate when adjoining magnetic track at videohead by the above-mentioned output signal detected carrier frequency of jumping over test section (51) and carrier frequency checkout gear (30) in abutting connection with magnetic track.Switch sections (53) remains the colour signal playback system (23) of alternation and the output signal of carrier frequency choice device in order to select its carrier frequency according to the above-mentioned control signal (LPH) of jumping over the output signal of test section (51) and carrier frequency alternation test section (52) and slow-speed mode in abutting connection with magnetic track.
Above-mentionedly jump over test section (51) in abutting connection with magnetic track and be connected to AND gate (AD1) by one-shot multivibrator (51A) and delayer (51B) and go up constitute.One-shot multivibrator (51A) is transformed into 0.5H in order to pulse duration of horizontal-drive signal (HS) that will input, is exported then.Delayer (51B) is used so that the output signal of above-mentioned one-shot multivibrator (51A) postpones 0.5H.AND gate (AD1) is then in order to make up the output signal of above-mentioned one-shot multivibrator (51A) and delayer (51B).Carrier frequency alternation test section (52) then is connected to AND gate (AD2) by biconditional gate (EXNR) and goes up formation.Biconditional gate (EXNR) is in order to the output signal of incoming carrier frequency detecting device (30) and two signals that postponed in 0.5H delayer (52A).AND gate (AD2) is in order to make up with the output of above-mentioned biconditional gate (EXNR) with in abutting connection with the output that magnetic track jumps over test section (51).On the other hand, switch sections (53) by toggle flip-flop (53A) (53B), AND gate (AD3) and analog switch (53C) form.Toggle flip-flop (53A) (53B) jumps over the output signal upset of test section (51) and carrier frequency alternation test section (52) by above-mentioned in abutting connection with magnetic track, is resetted by slow-speed formula control signal (LPH).AND gate (AD3) is in order to make up above-mentioned trigger (53A) output signal and slow-speed formula control signal (LPH) (53B) respectively as input.Analog switch (53C) is changed by the output of above-mentioned AND gate (AD3).
In above-mentioned configuration mode, analog switch (45) (53C) connects to such an extent that make when being added with high potential on its control terminal respectively, movable contact (a2) is connected with the fixed contact (a1) of a side, makes slow-speed formula control signal (LPH) be in high potential simultaneously under the slow-speed mode.
Explanation the present invention now is the working condition of colour signal compensating circuit as constituted above.In Fig. 9, under the slow-speed mode, videotape is not carried out playback time, slow-speed formula control signal (LPH) is in electronegative potential, the input be added to trigger (53A) reseting terminal (RST1) (53B) (RST2) on, so trigger (53A) (53B) resets, be in electronegative potential in the output of lead-out terminal (Q1) on (Q2).Therefore the output of AND gate (AD3) is owing to be in low-potential state, the movable contact of analog switch (53C) just couples together with the fixed contact (b2) of opposite side, directly is input to the blender shown in Figure 8 (26) by analog switch (53C) thereby make from the colour signal of colour signal playback system (23) output.
Under the slow-speed mode, videotape is carried out playback time, slow-speed formula control signal (LPH) be in high potential state be added to trigger (53A) (53B) on, thereby removed the reset mode of trigger.In this state, if colour signal playback system (23) outgoing carrier frequency such colour signal of alternation between 4.25 megahertzes and 4.4 megahertzes shown in Figure 10 (A), then 4.25 megahertz filters (31) in the carrier frequency checkout gear (30) detect the colour signal of 4.25 megahertz carrier frequencies from this colour signal, as shown in Figure 10 (B).Output signal is carried out integration by integrator (32) like that shown in Fig. 1 (C) then, be added to again on the not inverting terminal (+) of comparator (33), thereby comparator (33) is compared the output signal and the reference voltage (VR) of integrator (32), and shown in Figure 10 (D) like that, output high potential when carrier frequency is 4.25 megahertzes, on the contrary, output electronegative potential when 4.4 megahertzes.
Therebetween, 150 kilohertz oscillator (41) in the carrier frequency choice device (40) are vibrated and are exported 150 kilo hertzs oscillator signal, and this oscillator signal of 150 kilo hertzs is input to the colour signal of exporting from the colour signal playback system (23) of Fig. 8 and carries out the balance modulation the balanced modulator (42).So the outgoing carrier frequency translation became the colour signal of 4.25 ± 0.15 megahertzes (4.1 megahertzes and 4.4 megahertzes) when balanced modulator (42) was 4.25 megahertzes in the carrier frequency of colour signal, the colour signal of 4.4 megahertz carrier frequencies is added on the fixed terminal (a1) of analog switch (45) one sides by 4.4 megahertz filters (44) again; And when the carrier frequency of colour signal is 4.4 megahertzes, balanced modulator (42) outgoing carrier frequency has been transformed into the colour signal of 4.4+0.15 megahertz (i.e. 4.25 megahertzes and 4.55 megahertzes), by 4.25 megahertz filters (43) colour signal of 4.25 megahertz carrier frequencies is added on the fixed terminal (b1) of analog switch opposite side again.Like this, when its carrier frequency of colour signal of being exported from colour signal playback system (23) is 4.25 megahertzes, describe as preceding, because the movable contact of analog switch (45) is connected with the fixed contact (a1) of a side because of comparator (33) output high potential, thereby analog switch (45) selects and exports the output signal of 4.4 hertz of filters (44), and the carrier frequency of this output signal was transformed into 4.4 megahertzes from 4.25 megahertzes already.In addition, when its carrier frequency of signal of coming out from colour signal playback system (23) is 4.4 megahertzes, because the movable contact of analog switch (45) is connected with the fixed contact (b1) of opposite side because of the output of comparator (33) is in electronegative potential, thereby analog switch (45) selects and exports the output signal of 4.25 megahertz filters (43), and the carrier frequency of this output signal has been transformed into the output signal of 4.25 megahertzes from 4.4 megahertzes.So select and the colour signal exported is just regulated at the enterprising line level of level regulator (46) that operational amplifier (47) and resistor (R2) (R3) are formed through analog switch (45), be added to then on the fixed contact (a2) of analog switch (53C) side.
That is to say that carrier frequency choice device (40) carries out mutual conversion with two carrier frequencies of the colour signal that colour signal playback system (23) is exported, and they are adjusted to after the same level, with they output.
Have again, shown in Figure 11 (A) like that, Fig. 9 in abutting connection with horizontal-drive signal (HS) when input that magnetic track jumps over the picture intelligence of being reset test section (51), 0.5H one-shot multivibrator (51A) is the 0.5H wide pulse signal of output shown in Figure 11 (B) just, directly be added on the AND gate (AD1), be added on the AND gate (AD1) after postponing by such process of 0.5H delayer (51B) shown in Figure 11 (C) simultaneously, so, when on videohead jumps to the magnetic track of adjacency, making the width of playback picture intelligence become 0.5H, AND gate (AD1) output pulse signal is shown in Figure 11 (D).Trigger (53A) just according to the upset of this output pulse signal, is gone up output map 11(E at its lead-out terminal (Q1)) shown in signal.
The carrier frequency of the picture intelligence of so having reset is during for the sort of occasion shown in Figure 11 (F), the detection signal shown in Figure 11 (G) that above-mentioned comparator (33) is exported just directly is added on the biconditional gate (EXNR), is added on the biconditional gate (EXNR) by after such 0.5H of delay of delayer (52A) shown in Figure 11 (H) simultaneously.On the other hand, the carrier frequency of the colour signal after resetting is shown in Figure 11 (I) time, the detection signal shown in Figure 11 (J) that comparator (33) is exported just directly is added on the biconditional gate (EXNR), postpone to be added on the biconditional gate (EXNR) after the 0.5H by 0.5H delayer (52A) such shown in Figure 11 (K) simultaneously.Therefore in both cases, biconditional gate (EXNR) is all exported such pulse signal shown in Figure 11 (L).
But jump to when wanting the conversion carrier frequency in abutting connection with magnetic track at videohead, AND gate (AD2) will be exported the pulse signal shown in Figure 11 (M), trigger (53B) is through the high potential of upset output shown in Figure 11 (N), so AND gate (AD3) is output as high potential.Therefore the movable contact of analog switch (53C) just is connected with the fixed contact (a2) of a side, select and export the mutual checker of two carrier frequencies colour signal.
That is to say, jump to when magnetic track need not the conversion carrier frequency and also can deal with problems at videohead, just select the colour signal of colour signal playback system (23), when needing the conversion carrier frequency, just select and export two carrier frequencies by carrier frequency choice device (40) mutually conversion colour signal.
As detailed above, when Sequential Color and Memory system video tape recorder is carried out variable-speed replay to videotape under the slow-speed mode, circuit of the present invention is because the every 1H checker of its carrier frequency of colour signal exported, thus the colour of playback picture have reset good effect.
In this Figure of description, each major part label is concluded and is described as follows:
30-carrier frequency checkout gear
31,43-4.25 megahertz wave filter
The 32-integrator
The 33-comparator
40-carrier frequency selecting arrangement
The 42-balanced modulator
44-4.4 megahertz filter
The 45-analog switch
50-carrier frequency compensation identification device
51-jumps over the test section in abutting connection with magnetic track
52-carrier frequency alternation test section
The 53-switch sections
The VR-reference voltage
Claims (11)
1, a kind of compensating circuit of the visual videocorder of tool slow-speed function colour signal under multi-functional slow-speed mode is characterized in that it comprises:
The carrier frequency checkout gear is in order to detect from 4.25 megahertzes of the colour signal of colour signal playback system output or the arbitrary carrier frequency 4.4 megahertzes;
The carrier frequency choice device is in order to be transformed into 4.4 megahertzes or to be transformed into the carrier frequency of 4.25 megahertzes from 4.4 megahertzes from 4.25 megahertzes according to the colour signal of the output signal selection colour signal playback system of above-mentioned carrier frequency checkout gear;
The carrier frequency compensation identification device, in order to differentiating and colour signal not compensated, and select the output signal of above-mentioned colour signal playback system of output or above-mentioned carrier frequency choice device according to the horizontal-drive signal (HS) of the output signal of above-mentioned carrier frequency checkout gear.
2, the compensating circuit of visual videocorder as claimed in claim 1 colour signal under multi-functional slow-speed mode is characterized in that above-mentioned carrier frequency checkout gear comprises:
4.25 megahertz (4.4 megahertz) filter (31) is in order to 4.25 megahertzes (4.4 megahertz) the carrier frequency colour signal of detection from the carrier frequency (4.25 megahertzes, 4.4 megahertzes) of the colour signal of colour signal playback system (23) output;
Integrator (32) is connected to the output of above-mentioned filter (31), in order to output signal is carried out integration;
Comparator (33) is in order to compare the output signal of above-mentioned integrator and the reference voltage of having set (VR) respectively as input.
3, the compensating circuit of visual videocorder as claimed in claim 1 colour signal under multi-functional slow-speed mode is characterized in that above-mentioned carrier frequency choice device (40) comprising:
Balanced modulator (42) is used for carrying out the balance modulation as input respectively with the oscillator signal of the oscillator (41) of any frequency of oscillation vibration and the colour signal that colour signal playback system (23) is exported;
Filter (43) (44) detects the colour signal of 4.25 megahertzes and 4.4 megahertz carrier frequencies respectively in order to the output signal from above-mentioned balanced modulator (42);
Analog switch (45) is in order to the output signal that remains according to the output signal selection 4.25 megahertz filters (43) of the interior comparator of above-mentioned carrier frequency checkout gear (30) (33) and 4.4 megahertz filters (44) with the reverse checker of two carrier frequencies of the colour signal of colour signal playback system (23);
Level regulator (46) is in order to regulate above-mentioned analog switch (45) output signal level.
4, the compensating circuit of visual videocorder as claimed in claim 1 colour signal under multi-functional slow-speed mode is characterized in that above-mentioned carrier frequency compensation identification device comprises:
Jump over test section (51) in abutting connection with magnetic track, jump to the picture intelligence that produces in abutting connection with magnetic track in order to detect whether to have when the horizontal-drive signal (HS) of input playback picture intelligence because of videohead;
Carrier frequency alternation test section (52) is in order to detect when videohead jumps in abutting connection with magnetic track as above-mentioned its carrier frequency of output signal of jumping over test section (51) and carrier frequency checkout gear (30) in abutting connection with magnetic track alternate whether;
Switch sections (53) is in order to select its carrier frequency to remain the colour signal playback system (23) of alternation and the output signal of carrier frequency choice device according to above-mentioned output signal and slow-speed formula control signal (LPH) in abutting connection with magnetic track test section (51), carrier frequency alternation test section (52).
5, the compensating circuit of visual videocorder according to claim 4 colour signal under multi-functional slow-speed mode is characterized in that above-mentionedly jumping over test section (51) in abutting connection with magnetic track and being connected and composed by following each several part;
One-shot multivibrator (51A) is transformed into 0.5H in order to pulse duration of horizontal-drive signal (HS) that will input, is exported then;
Delayer (51B) postpones 0.5H in order to the output signal with above-mentioned one-shot multivibrator (51A);
AND gate (AD1) is in order to make up the output signal of above-mentioned one-shot multivibrator (51A) and delayer (51B).
6, the compensating circuit of visual videocorder according to claim 4 colour signal under multi-functional slow-speed mode is characterized in that above-mentioned carrier frequency alternating compenent (52) is connected and composed by following each several part:
Biconditional gate (EXNR) is in order to the output signal of incoming carrier frequency detecting device (30) and two signals that postponed in 0.5H delayer (52A);
AND gate (AD2) is in order to make up the output of above-mentioned biconditional gate (EXNR) and the output of jumping over test section (51) in abutting connection with magnetic track.
7, the compensating circuit of visual videocorder according to claim 4 colour signal under multi-functional slow-speed mode is characterized in that above-mentioned switch sections (53) comprising:
Trigger (53A) (53B) jumps over the output signal upset of test section (51) and carrier frequency alternation test section (52) by means of above-mentioned in abutting connection with magnetic track, resets by means of slow-speed formula control signal (LPH);
AND gate (AD3) is in order to make up above-mentioned trigger (53A) output signal and slow-speed formula control signal (LHP) (53B) respectively as input;
Analog switch (53C) is changed by means of the output of above-mentioned AND gate (AD3).
8, a kind of compensating circuit of visual videocorder colour signal under multi-functional slow-speed mode is characterized in that the cited visual videocorder of claim 1 to 7 is a video tape recorder.
9, a kind of compensating circuit of visual videocorder colour signal under multi-functional slow-speed mode is characterized in that the cited visual videocorder of claim 1 to 8 is for adopting the video tape recorder of Sequential Color and Memory system or MESECAM system.
10, the compensating circuit of visual videocorder colour signal under multi-functional slow-speed mode is characterized in that the cited visual videocorder of claim 1 to 7 is video Cassette recorder equipped.
11, the compensating circuit of visual videocorder colour signal under multi-functional slow-speed mode is characterized in that the cited visual videocorder of claim 1 to 8 is for adopting the video Cassette recorder equipped of Sequential Color and Memory system or MESECAM system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR19087/89 | 1989-12-16 | ||
| KR2019890019087U KR920006751Y1 (en) | 1989-12-16 | 1989-12-16 | Color signal compensating circuit of vtr |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1052583A true CN1052583A (en) | 1991-06-26 |
| CN1031095C CN1031095C (en) | 1996-02-21 |
Family
ID=19293274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90104363A Expired - Fee Related CN1031095C (en) | 1989-12-16 | 1990-06-09 | Circuit for compensating color signal of video tape recording and/or reproducing apparatus |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH0713335Y2 (en) |
| KR (1) | KR920006751Y1 (en) |
| CN (1) | CN1031095C (en) |
| FR (1) | FR2656190B1 (en) |
| RU (1) | RU2100912C1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100382007B1 (en) * | 1995-12-20 | 2003-08-21 | 삼성테크윈 주식회사 | High magnification zoom lens |
| JP4568534B2 (en) * | 2004-05-19 | 2010-10-27 | 株式会社丸加 | Electric machine unlocking device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2759866C2 (en) * | 1976-10-29 | 1983-10-13 | Ampex Corp., 94063 Redwood City, Calif. | Arrangement for the selective insertion of a digital synchronization word in at least one digitally coded data sequence clocked at a predetermined frequency to an input |
| JPS6033033B2 (en) * | 1977-11-21 | 1985-07-31 | ソニー株式会社 | Color video signal recording/playback device |
| JPS58100582A (en) * | 1981-12-10 | 1983-06-15 | Toshiba Corp | Television signal automatic discrimination and switching circuit |
| JPS5914471U (en) * | 1982-07-20 | 1984-01-28 | 日本ビクター株式会社 | Image quality improvement circuit for color video signals |
| US4672469A (en) * | 1983-08-26 | 1987-06-09 | Victor Company Of Japan, Ltd. | Delay time adjusting system for video signal reproducing apparatus having heads scanning across multiple tracks |
| JPS60169294A (en) * | 1984-02-13 | 1985-09-02 | Sony Corp | Video tape recorder |
-
1989
- 1989-12-16 KR KR2019890019087U patent/KR920006751Y1/en not_active IP Right Cessation
-
1990
- 1990-05-29 JP JP1990056426U patent/JPH0713335Y2/en not_active Expired - Lifetime
- 1990-06-01 FR FR9006883A patent/FR2656190B1/en not_active Expired - Lifetime
- 1990-06-09 CN CN90104363A patent/CN1031095C/en not_active Expired - Fee Related
- 1990-06-22 RU SU904830103A patent/RU2100912C1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2656190B1 (en) | 1992-10-30 |
| KR910012737U (en) | 1991-07-30 |
| FR2656190A1 (en) | 1991-06-21 |
| RU2100912C1 (en) | 1997-12-27 |
| JPH0713335Y2 (en) | 1995-03-29 |
| KR920006751Y1 (en) | 1992-09-26 |
| CN1031095C (en) | 1996-02-21 |
| JPH0382988U (en) | 1991-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 19960221 |