CN1156305A - Magnetic recording reproducing device - Google Patents
Magnetic recording reproducing device Download PDFInfo
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- CN1156305A CN1156305A CN 95118788 CN95118788A CN1156305A CN 1156305 A CN1156305 A CN 1156305A CN 95118788 CN95118788 CN 95118788 CN 95118788 A CN95118788 A CN 95118788A CN 1156305 A CN1156305 A CN 1156305A
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Abstract
The invention provides a magnetic recording regenerative apparatus, comprising a device which takes ylindrical PG signals as reference to generate magnetic head switch signals; a magnetic head delay device which sets a delay time to delay the generating time, namely, the pulse rising edge, of the magnetic head switch signals; a phase comparison detection device which measures the phase time difference of a vertical sync signal and a magnetic head switch signal regenerated by the magnetic head; a calculating device to calculate the deviation between the phase time difference and the target value preset in advance; and a revising device which adjusts the delay time of a delay data generating device according to the output value of the calculating device. Accordingly, the switching point of the magnetic head switch signal can be easily adjusted and processed in short time.
Description
The present invention relates to a kind of automatic mechanism that has, the switching point of the magnetic head switching signal that rotation produces to the cylinder motor is made self-adjusting magnetic recorder/reproducer.
In recent years, video tape recorder develops towards miniaturization, low price direction, thereby nothing is adjusted in the video tape recorder manufacturing process, adjustment is indispensable for the shortening of adjusting man-hour automatically.In the above-mentioned adjustment project, when the rotating magnetic head rigging position information that is provided with on the cylinder is when producing with electrical signal form, in order to revise the deviation of said head rigging position, adopt a kind of like this way, be benchmark promptly with the PG signal section that rotates the cylinder rotatable phase signal cylinder PFG signal that produces with the cylinder motor, the retardation of delay monostable multivibrator circuit is changed, adjust magnetic head switching signal switching point.
Below the adjustment of magnetic head switching signal switching point is handled in the existing magnetic recorder/reproducer of explanation.
Fig. 3 is the mode chart of signal VHS standard picture signal field track part (Off ィ Le De ト ラ Star Network), Fig. 4 is the block diagram that the magnetic head switching signal switching point of the existing magnetic recorder/reproducer of signal is adjusted disposal system, and Fig. 5 is the time diagram that existing magnetic recorder/reproducer magnetic head switching signal switching point is adjusted.
Among Fig. 4, the 101st, be disposed at the picture signal record regeneration magnetic head on the cylinder motor, the 102nd, the reproduce head amplifier, the 103rd, the picture signal demodulation section, the 104th, the vertical synchronizing signal separation circuit, the 105th, the cylinder motor, the 106th, microprocessor, the 107th, magnetic head switching signal generation handling part, the 108th, the delay monostable multivibrator circuit, the 115th, outage the time still can be preserved the back-up battery circuit that the RAM data of microcomputer 106 are used, and S1a to S1h represents signal, and S1a is the reproduce head output signal, S1b reproduce head amplifier output signal, S1c is the reproduced picture signal, and S1d is a vertical synchronizing signal, and S1e is a cylinder PFG signal, S1f is that magnetic head switches the out gate signal, S1g is the delay monostable multivibrator signal, and S1h is the magnetic head switching signal, Vcc, VR1, C1, VR2, SW1, SW2 is the retardation generation circuit of delay monostable multivibrator circuit 108.Vcc is a power supply, VR1 is the special-purpose potentiometer of the standard of TSC-system, and VR2 is the special-purpose potentiometer of the standard of PAL-system, and C1 is the signal charge and discharge capacitance device of delay monostable multivibrator, SW1 is the standard normally closed switch of TSC-system, and SW2 is the standard normally closed switch of PAL-system.
Its recording interval of vertical synchronizing signal of Fig. 3 VHS standard picture signal per pass field track part record is all formatted, the adjustment that magnetic head switching signal switching point used when adjusting with its vertical synchronizing signal record position of regeneration tape compared with above-mentioned form, be recording interval narrow many, standard reference tape that precision is much higher.
Next with Fig. 4 and Fig. 5 magnetic head switching signal switching point adjustment processing is described.
In the video tape recorder manufacturing process, make above-mentioned adjustment be input to magnetic head amplifier 102 after the reproduce head that magnetic head 101 obtains is exported regenerated signal S1a with the regeneration of regeneration tape, and amplify output signal S1b as reproduce head and input to picture signal demodulation section 103, generate reproduced picture signal S1c.Then, reproduced picture signal S1c inputs to vertical synchronizing signal separation circuit 104, generates vertical synchronizing signal S1d.On the other hand, the cylinder PG signal that generates with cylinder motor 105 rotation and the cylinder PFG signal S1e of cylinder FG signal superposition input to the magnetic head switching signal generation handling part 107 of microcomputer 106 inside, the benchmark that is input as with the PG signal section of cylinder PFG signal S1e, the FG signal that arrives later at the PG signal section (is denoted as FG1 for ease of each FG pulse is described, FG2, FG3) rising edge of junior one pulse FG1 signal constantly in the middle of, the delay monostable multivibrator signal S1g that inputs to delay monostable multivibrator circuit 108 becomes the charge mode that begins from low-potential state, begins delay monostable multivibrator signal charge and discharge capacitance device C1 is charged.Then when delay monostable multivibrator signal S1g current potential surpasses the reference voltage of delay monostable multivibrator circuit 108 inside, that is to say, behind rising edge process Td time delay of signal FG1, magnetic head switches out gate signal S1f and just exports magnetic head switching signal generation handling part 107 to, generates magnetic head switching signal S1h rising edge signal.Next, in the rising edge moment of signal FG3, delay monostable multivibrator signal S1g becomes the discharge mode that begins from high potential state, charge discharge to delay monostable multivibrator signal charge and discharge capacitance device C1, still keep discharge mode after the discharge, keep low-potential state.Next, in the rising edge moment of signal FG4, delay monostable multivibrator signal S1g is in charge mode once more, from signal FG4 rising edge process Td time delay, the output magnetic head switches out gate signal S1f, generate the negative edge signal of magnetic head switching signal S1h, follow the rising edge moment at next signal FG1, delay monostable multivibrator signal S1g is in discharge condition once more, later input according to cylinder PFG signal S1e, by generating delay monostable multivibrator signal S1g, output magnetic head switching signal S1h.
Next, adjust in the processing procedure at actual magnetic head switching signal switching point, when carrying out the standard adjustment of TSC-system, the adjustment of TSC-system formula is regenerated with tape, the input switching point mistiming to vertical synchronizing signal S1d and magnetic head switching signal S1h measures, make TSC-system formula normally closed switch SW1 closure, pal mode switch SW 2 is opened, by retardation being adjusted the adjustment of potentiometer VR1 resistance value, the charge waveforms of delay monostable multivibrator signal waveform S1e is changed, to adjusting aforementioned time delay, make that the aforementioned input phase mistiming is a desired value by artificial or automatic mechanism.And the standard of carrying out PAL-system is when adjusting, the adjustment of pal mode is regenerated with tape, the input phase mistiming to vertical synchronizing signal S1d and magnetic head switching signal S1h measures, make pal mode normally closed switch SW2 closure, TSC-system formula switch SW 1 is opened, by retardation being adjusted the adjustment of potentiometer VR2 resistance value, the charge waveforms of delay monostable multivibrator signal waveform S1e is changed, by artificial or automatic mechanism to aforementioned time delay Td adjust, making the aforementioned input phase mistiming is desired value.
Back-up battery circuit 115 is irrelevant with the adjustment of aforementioned magnetic head switching signal switching point, and the microcomputer 106 inner various RAM data of using can be preserved several years.
But, existing structure in manufacturing process with regard to magnetic head switching signal switching point adjustment must adjust regeneration with tape, to be desired value with the input phase difference time set of resulting vertical synchronizing signal S1d and magnetic head switching signal S1h, need change retardation by artificial or automatic mechanism and adjust the resistance value of potentiometer VR1 or VR2 and adjust above-mentioned time delay of Td.And, also having such problem with TSC-system and two kinds of corresponding video tape recorders of standard of PAL-system, promptly above-mentioned adjustment need be carried out respectively, make increase the man-hour of manufacturing process, and aforementioned delay monostable multivibrator circuit material takes the cost rising.
The present invention addresses the above problem just, and its purpose is to provide a kind of and adjusts the magnetic recorder/reproducer that operation can reduce cost with adjusting circuit by the magnetic head switching signal switching point of cutting down in the video tape recorder manufacturing process.
The invention provides a kind of magnetic recorder/reproducer, because the cylinder PG signal with the cylinder motor rotation generation that will dispose magnetic recording head generates the magnetic head switching signal generating means of magnetic head switching signal as benchmark; Set time delay so that the magnetic head switching delay device that the moment is the rising edge of a pulse delay takes place this magnetic head switching signal; The pick-up unit of bit comparison mutually to the mistiming metering of the vertical synchronizing signal of magnetic head regeneration and magnetic head switching signal phase place; Obtain the arithmetic unit of deviation between the phase time difference of this phase bit comparison pick-up unit output and the predefined desired value; The means for correcting of being adjusted the time delay of delayed data generating means according to the output valve of this arithmetic unit, thereby the adjustment of magnetic head switching point can be handled easily and in the short time in the manufacturing process.
In addition, also be provided with memory storage, with initial value time delay corresponding to a plurality of signaling mode storage head switching delay devices of magnetic head regeneration, and being provided with the signaling mode according to magnetic head regeneration, a plurality of devices that time delay, initial value was exported as the time delay of magnetic head switching delay device of selection memory storage stored, adjustment so repeatedly is high-level efficiency more.
In addition, the cylinder PFG signal that the present invention has is that the rotation of input cylinder motor produces, superposition has cylinder PG signal on the cylinder FG signal, and with PG time of cylinder PFG signal be the microcomputer that benchmark produces the magnetic head switching signal, also comprise in microcomputer inside: the magnetic head switching delay counter that the time of origin of magnetic head switching signal is postponed; The vertical synchronizing signal that is input to microcomputer is detected handling part with the bit comparison mutually that the mistiming of the input phase of magnetic head switching signal measures; The counting initialize data that produces magnetic head switching delay counter is the magnetic head switching delay data generation handling part of magnetic head switching delay data, obtain the phase bit comparison and detect the input phase mistiming of handling part detection and the departure between the predefined desired value, and set and revise the magnetic head switching delay data that departure is used, by adjusting the switching point of magnetic head switching signal like this.
Can detect the input phase mistiming of handling part metering vertical synchronizing signal and magnetic head switching signal by the phase bit comparison according to this formation, obtain the departure between resulting result and the input phase mistiming desired value, set the magnetic head switching delay data of revising above-mentioned departure, the switching point of magnetic head switching signal is adjusted.
Fig. 1 is the block diagram that signal magnetic recorder/reproducer one embodiment magnetic head switching signal switching point of the present invention is adjusted disposal system automatically.
Fig. 2 is the self-adjusting time diagram of identical embodiment magnetic head switching signal switching point.
Fig. 3 is the mode chart of signal VHS standard picture signal field track part.
Fig. 4 is the block diagram that the existing magnetic recorder/reproducer magnetic head switching signal switching point of signal is adjusted disposal system.
Fig. 5 is the time diagram that existing magnetic recorder/reproducer magnetic head switching signal switching point is adjusted.
A following embodiment with reference to description of drawings magnetic recorder/reproducer of the present invention.
Fig. 1 is the block diagram that signal magnetic recorder/reproducer one embodiment magnetic head switching signal switching point of the present invention is adjusted disposal system automatically.Fig. 2 is the self-adjusting time diagram of identical embodiment magnetic head switching signal switching point.
Among Fig. 1, the 101st, be configured in the picture signal record regeneration magnetic head on the cylinder motor, the 102nd, the reproduce head amplifier, the 103rd, the picture signal demodulation section, the 104th, the vertical synchronizing signal separation circuit, the 105th, the cylinder motor, the 106th, microprocessor, 107 and 109 to 113 are the handling part of microprocessor 106 inside, the 107th, magnetic head switching signal generation handling part, playing the cylinder PG signal (present embodiment produces as the PFG signal) that produces with the rotation of cylinder motor is benchmark, produces the effect of the magnetic head switching signal generating means of magnetic head switching signal.
The 109th, magnetic head switching delay counter circuit, the 110th, the phase bit comparison detects handling part, the 111st, magnetic head switching delay data generation handling part, the 112nd, the delayed data arithmetic processing section, the 113rd, magnetic head switching delay data RAM, magnetic head switching delay counter circuit 109 plays the effect of magnetic head switching delay device, and the phase bit comparison detects the effect that 110 of handling parts play the pick-up unit of bit comparison mutually that the vertical synchronizing signal of magnetic head 101 regeneration and the phase time difference of magnetic head switching signal are measured.
Bear by magnetic head switching delay data generation handling part 111 and delayed data arithmetic processing section 112 the phase bit comparison is detected the arithmetic unit that deviation between the phase time difference of handling part 110 outputs and the predefined desired value is carried out calculation process, and by the effect of playing means for correcting that constitutes that this result is fed back to magnetic head switching delay counter circuit 109.The operation result of this arithmetic unit stores in the magnetic head switching delay data RAM 113 that plays the memory storage effect.
In addition, 114 expression display tubes, 115 expression back-up battery circuits, S1a to S1n represents the data of signal or microprocessor 106 inter-process, wherein S1a is the reproduce head output signal, S1b is the reproduce head amplifier output signal, and S1c is the reproduced picture signal, and S1d is a vertical synchronizing signal, S1e is a cylinder PFG signal, S1f is that magnetic head switches the out gate signal, and S1h is the magnetic head switching signal, and S1j is the input phase mistiming data of vertical synchronizing signal S1d and magnetic head switching signal S1h, S1k is that the magnetic head switching delay writes data, S1m is the alarm shows signal, and S1n is magnetic head switching delay data, and S1p is a magnetic head switching delay reading of data.
Below the present embodiment that just constitutes as mentioned above describe its action in detail.
In the video tape recorder manufacture process, only make TSC-system or the central a certain playback of data regeneration of PAL-system of adjusting usefulness, the reproduce head output regenerated signal S1a that obtains from magnetic head 101 is input to magnetic head amplifier 102, next input to the picture signal demodulation section as reproduce head amplifier output signal S1b, generate reproduced picture signal S1c.Then, reproduced picture signal S1c inputs to vertical synchronizing signal separation circuit 104, generates vertical synchronizing signal S1d.In addition, the cylinder PG signal that produces of cylinder motor 105 rotation and cylinder FG signal mutually the cylinder PFG signal S1e of superposition be input to the magnetic head switching signal generation handling part 107 of microcomputer 106 inside.
Magnetic head switching delay data generation handling part 111, standard corresponding to the signal of magnetic head 101 regeneration, according to the standard of TSC-system and PAL-system, export the initial value (also can be stored in the magnetic head switching delay data RAM 113) of the magnetic head switching delay reading of data S1p that presets to magnetic head switching delay counter circuit 109.Then magnetic head switching delay counter circuit 109 will determine that according to the magnetic head switching delay reading of data S1p of input the magnetic head of output time (magnetic head switching signal time of origin) switches out gate signal S1f and exports magnetic head switching signal generation handling part 107 to.
The action of magnetic head switching delay counter circuit 109 is to be benchmark with input time of the PG signal section of cylinder PFG signal S1e at first, make delay counter starting as the initialize data work of inner magnetic head switching delay counter the input time of the FG signal FG1 rising edge that arrives after aforementioned PG signal section.This delay counter is set time delay according to magnetic head switching delay reading of data S1p.
Then, when the counting of said head switching delay reading of data S1p size finishes, the output magnetic head switches out gate signal S1f, and magnetic head switching signal generation handling part 107 generates the rising edge signal of magnetic head switching signal S1h in the rising edge signal input time that magnetic head switches out gate signal S1f.That is to say, be input as benchmark, when through suitable with the counting of magnetic head switching delay data S1p time delay during Td, the rising edge signal of output magnetic head switching signal S1h with the rising edge of FG signal FG1.
And, input time at FG signal FG4 rising edge, carry out the starting of the setting delay counter of magnetic head switching delay reading of data S1p equally with the generation action of said head switching signal S1h rising edge signal, be input as benchmark when through suitable with the counting of magnetic head switching delay data S1p time delay during Td, the negative edge signal of output magnetic head switching signal S1h with the rising edge of FG signal FG4.
Here be to set magnetic head switching signal S1h negative edge, but be not limited thereto, also can set negative edge according to the PG signal with FG signal FG4.
Then, the phase bit comparison detect handling part 110 continuous 8 times whenever the rising edge input that magnetic head switching signal S1h is arranged, just from input phase mistiming that the rising edge of the input time of vertical synchronizing signal S1d and magnetic head switching signal S1h measures two signals input time, obtain above-mentioned 8 input phase mistiming mean values, the result who obtains is inputed to magnetic head switching delay data generation handling part 111 as input phase mistiming data S1j.
Magnetic head switching delay data generation handling part 111 is obtained the departure between input phase mistiming data S1j and the inner predefined input phase mistiming datum target value, obtain the magnetic head switching delay data S1n of the detection signal of using as the correction departure again, by delayed data arithmetic processing section 112, write data S1k as the magnetic head switching delay and be written to magnetic head switching delay data RAM 113, simultaneously will above-mentionedly write data adding magnetic head switching delay reading of data S1p by said head switching delay data RAM 113 is update information, in magnetic head switching delay counter circuit 109, be set at delay time data, thereby can adjust Td time delay of magnetic head switching signal.
Again, when delayed data arithmetic processing section 112 is the TSC-system formula when present automatic adjustment mode, the magnetic head switching delay data S1n of input is judged as TSC-system formula delayed data, above-mentioned TSC-system formula delayed data is multiplied by result that correction factor (the picture field frequency of the picture field frequency/pal mode of TSC-system formula) draws as the pal mode delayed data, and when present automatic adjustment mode is pal mode, the magnetic head switching delay data S1n of input is judged as the pal mode delayed data, above-mentioned pal mode data are multiplied by result that correction factor (the picture field frequency of the picture field frequency/TSC-system formula of pal mode) draws as TSC-system formula delayed data, above-mentioned TSC-system formula delayed data and two kinds of data of above-mentioned pal mode delayed data all write data S1k as the magnetic head switching delay and export to magnetic head switching delay data RAM 113, by storing separately independently RAM into, finish automatic adjustment to magnetic head switching signal switching point.When generating magnetic head switching signal S1h later on, time delay Td be standard according to TSC-system and PAL-system, the above-mentioned RAM data of magnetic head switching delay data RAM 113 are set in magnetic head switching delay counter circuit 109 as magnetic head switching delay reading of data S1p.
And, with with formed the identical back-up battery circuit 115 that makes in the past and be connected with microcomputer 106, even if the video tape recorder power supply is in off state, also can the above-mentioned RAM data of being stored be preserved many years by magnetic head switching delay data RAM 113, later video tape recorder power connection does not just need to carry out again the automatic adjustment of magnetic head switching signal switching point.In addition, storer adopts nonvolatile memory, in advance a plurality of magnetic head switching delay data is stored by each signaling mode, and is effective equally from the way of wherein selecting according to the signaling mode that magnetic head 101 bears again.
In addition, the phase bit comparison that said head switching signal switching point is adjusted processing automatically detects handling part 110 in the input phase mistiming data operation processing procedure of vertical synchronizing signal S1d and magnetic head switching signal S1h, there is not vertical synchronizing signal S1d input, or resulting input phase mistiming data are when being this mistake of abnormal data, just forced interruption is handled, carrying out tape takes out and thisly moves different actions with just often handling, be prohibited from entering next process, and wrong factor code is delivered to display tube 114 as the alarm shows signal, alarm demonstration, thus after can makeing mistakes at short notice at processing.
In sum, first, the present invention can be when tape be regenerated input phase mistiming of detected vertical synchronizing signal and magnetic head switching signal measure, obtain the departure between gained result and the predefined input phase mistiming desired value, magnetic head switching delay data are revised, carried out the automatic adjustment of magnetic head switching signal switching point in the video tape recorder manufacturing process; The second, even if video tape recorder is in off-position, also can preserve said head switching delay data for many years by on microcomputer, connecting with the back-up battery circuit of same structure in the past; The 3rd, video tape recorder for TSC-system and two kinds of standards of PAL-system, in the manufacturing process to the automatic adjustment of magnetic head switching signal switching point as long as any standard in the middle of TSC-system formula or the pal mode is adjusted automatically, just can obtain the magnetic head switching delay data of another kind of standard; The 4th, when magnetic head switching signal switching point is adjusted the unusual generation that has in service automatically, in the time of can not adjusting automatically, can carry out wrong Interrupt Process and error reason shows, by above four kinds of measures, can in video tape recorder manufacturing process, cut down magnetic head switching signal switching point and adjust operation and adjust circuit, the cost of fee of material is descended.
Claims (8)
1. magnetic recorder/reproducer is characterized in that comprising:
The cylinder PG signal that produces with the rotation of the cylinder motor of configuration record magnetic head is a benchmark, produces the magnetic head switching signal generating means of magnetic head switching signal;
Set the magnetic head switching delay device of the time of origin delay that makes described magnetic head switching signal time delay,
The pick-up unit of bit comparison mutually that the vertical synchronizing signal that aforementioned magnetic head is born again and the phase time difference of aforementioned magnetic head switching signal are measured;
Obtain the arithmetic unit of deviation between the phase time difference of aforementioned phase bit comparison pick-up unit output and the predefined desired value;
According to the output valve of aforementioned arithmetic unit, to the correcting device of adjusting the time delay of described delayed data generating means.
2. magnetic recorder/reproducer as claimed in claim 1 is characterized in that comprising: corresponding to the memory storage of a plurality of signaling mode storage head switching delay device initial values time delay of magnetic head regeneration.
3. magnetic recorder/reproducer as claimed in claim 2 is characterized in that, corresponding to the signaling mode of magnetic head regeneration, the initial value of a plurality of time delays that the selection memory storage is stored is as output time delay of magnetic head switching delay device.
4. magnetic recorder/reproducer as claimed in claim 2 is characterized in that memory storage is a nonvolatile memory.
5. magnetic recorder/reproducer, it is characterized in that, comprise superposition on the cylinder FG signal that an input cylinder motor rotation produces have cylinder PG signal cylinder PFG signal, PG time of described cylinder PFG signal is produced the microcomputer of magnetic head switching signal as benchmark, aforementioned microcomputer inside comprises: the magnetic head switching delay counter that the time of origin of aforementioned magnetic head switching signal is postponed; The bit comparison mutually that the input phase mistiming of the vertical synchronizing signal of importing aforementioned microcomputer and aforementioned magnetic head switching signal is measured detects handling part; The counting initialize data that produces aforementioned magnetic head switching delay counter is the magnetic head switching delay data generation handling part of magnetic head switching delay data, by obtaining the departure between aforementioned phase bit comparison detection detected aforementioned input phase mistiming of handling part and the predefined desired value, setting is adjusted the switching point of magnetic head switching signal to the aforementioned magnetic head switching delay data of described departure do correction usefulness.
6. magnetic recorder/reproducer as claimed in claim 5, it is characterized in that comprising: in magnetic head switching signal switching point is adjusted, adopt the magnetic head switching delay data of the TSC-system formula that draws when adjusting to obtain the pal mode delayed data by calculating under the TSC-system formula, the aforementioned magnetic head switching delay data of the pal mode that draws when adopting adjustment under pal mode are obtained the delayed data arithmetic processing section of TSC-system formula delayed data by calculating.
7. magnetic recorder/reproducer as claimed in claim 5, it is characterized in that, in magnetic head switching signal switching point is adjusted, when having, input phase mistiming of vertical synchronizing signal and magnetic head switching signal metering result carries out and just often different action when unusual, simultaneously can with the display part of microcomputer communication on alarm demonstration, to represent aforementioned metering result's abnormal cause.
8. magnetic recorder/reproducer as claimed in claim 5, it is characterized in that, when comprising an outage backup battery is connected with microcomputer, to preserve the holding device of aforementioned microcomputer RAM data, in the middle of the outage by the magnetic head switching delay data storage determined in will magnetic head switching signal switching point adjusting in aforementioned microcomputer RAM district, have no progeny in power connection/pass and all to adopt identical data as aforementioned magnetic head switching delay data.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP277581/94 | 1994-11-11 | ||
| JP6277581A JPH08138283A (en) | 1994-11-11 | 1994-11-11 | Magnetic recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1156305A true CN1156305A (en) | 1997-08-06 |
| CN1086829C CN1086829C (en) | 2002-06-26 |
Family
ID=17585468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95118788A Expired - Fee Related CN1086829C (en) | 1994-11-11 | 1995-11-10 | Magnetic recording reproducing device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH08138283A (en) |
| CN (1) | CN1086829C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100444274C (en) * | 2003-09-22 | 2008-12-17 | 松下电器产业株式会社 | Phase adjustment circuit and demodulation circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000268449A (en) * | 1999-03-17 | 2000-09-29 | Mitsubishi Electric Corp | Magnetic recording and reproducing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940010038A (en) * | 1992-10-28 | 1994-05-24 | 사또오 후미오 | Magnetic recording and playback device |
-
1994
- 1994-11-11 JP JP6277581A patent/JPH08138283A/en active Pending
-
1995
- 1995-11-10 CN CN95118788A patent/CN1086829C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100444274C (en) * | 2003-09-22 | 2008-12-17 | 松下电器产业株式会社 | Phase adjustment circuit and demodulation circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1086829C (en) | 2002-06-26 |
| JPH08138283A (en) | 1996-05-31 |
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