JPH07169153A - How to run a data recorder - Google Patents

Abstract

(57) [Summary] [Purpose] Synchronize with the accuracy of data units or clock units. Constitution: For example, clock circuits 31 and 41 in clock units are driven in synchronization with the time data inserted in the data signals reproduced by the data recorders 1 and 2. This clock data is latched by the latch circuits 32 and 42 and supplied to the time difference detection circuit 33, and the detected value is supplied to the control circuit 34. Further, the sync signal generated by the sync generation circuit 36 is supplied to the data recorder 1. Further, the command from the control circuit 34 is supplied to the control circuit 43. Further, the synchronization signal from the synchronization generation circuit 36 is supplied to the delay circuit 44, and the delay amount is controlled by the signal from the control circuit 43. The synchronizing signal from the delay circuit 44 is sent to the data recorder 2
Is supplied to.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recorder driving method used, for example, when collecting and analyzing astronomical data and the like recorded and observed at a remote place.

[0002]

2. Description of the Related Art For example, astronomical observation has been carried out by providing observation points at two locations corresponding to both ends of the diameter of the earth. The data etc. observed at such a remote place are usually collected in one place and analyzed. Therefore, conventionally, observed data and the like are recorded by a data recorder, the recorded tape is collected, the tape is synchronously reproduced, and reproduced data and the like are comparatively analyzed.

On the other hand, as a data recorder for recording such observation data, an extremely large recording capacity and a high data rate are required. Therefore, as a data recorder satisfying such requirements, a so-called digital VT is used.
Devices based on R have been developed.

[0004]

However, in the case of synchronously reproducing the tape of the data recorder based on such a digital VTR, it has been conventionally carried out by a method based on the editing of the VTR. That is, in the case of VTR, the minimum unit of editing is a field. Therefore, the digital V
Even in a TR-based data recorder, synchronous reproduction is performed according to an id value (time code) provided for each recording unit corresponding to a field.

However, in the synchronous reproduction using such an id value, synchronization can be achieved only at intervals of, for example, 50 Hz corresponding to a field, and it has been difficult to achieve synchronization with an accuracy of data unit or clock unit. . On the other hand, conventionally, the preceding reproduction data is delayed by using a buffer memory, and the delay amount is controlled to achieve synchronization. However, this method requires a large amount of buffer memory, which causes problems such as the price of the device and the installation location.

By the way, in the above-mentioned data such as astronomical observation,
For example, accurate time data is generated at 1 second intervals, and this time data is inserted and recorded in the data signal.
However, in the past, this time data was only used for data retrieval and display, for example.

[0007] This application was made in view of such a point, and the problem to be solved is i
It is said that the synchronization is achieved only at the interval of the d value, and it is difficult to achieve the synchronization with the accuracy of the data unit or the clock unit.

[0008]

A first means according to the present invention is a data recorder adjusting method for synchronously reproducing a plurality of data recording tapes having time information in data. This is a method for adjusting the data recorder in which the data recorder is synchronized by using the synchronization signal on the data recording tape and then synchronized by using the time information in the data.

According to a second means of the present invention, in the data recorder driving method according to the first means, the synchronizing signal on the data recording tape reads the signal recorded in the longitudinal direction of the tape. This is the method of adjusting the data recorder.

According to a third means of the present invention, in the data recorder adjusting method according to the first means, the synchronization using the time information is performed by a difference of the time information from a synchronization signal on the data recording tape. This is a data recorder adjustment method in which the phase of a signal to be read is controlled.

According to a fourth means of the present invention, in the data recorder adjusting method according to the first means, the synchronizing signal recorded in the longitudinal direction on the data recording tape is read to perform the synchronous operation of the data recorder. After that, the data recorder adjusts the phase by synchronizing the phase of the sync signal read from the sync signal on the data recording tape by using the difference in the time information in the data.

[0012]

According to this, after synchronizing operation of the data recorder by using the synchronizing signal on the data recording tape, by synchronizing using the time information in the data, the data unit or the clock unit can be easily synchronized. It can be synchronized with accuracy.

[0013]

1 shows an example of a system for implementing the method of the present invention. In FIG. 1, the data recorder 1
And 2 are provided with a master interface 3 and a slave interface 4, respectively. Figure 1
In the above example, the number of data recorders is two, but a larger number may be used. In that case, a plurality of slave interfaces are provided in parallel.

The data signals reproduced by the data recorders 1 and 2 are supplied to the master interface 3 and the slave interface 4, respectively. Also master interface 3 and slave interface 4
The command signals formed by are each the data recorder 1
And 2 are supplied.

Further, the id values detected by the data recorders 1 and 2 are supplied to the master interface 3 and the slave interface 4, respectively. In addition, the synchronization signals formed by the master interface 3 and the slave interface 4 are the data recorders 1 and 2, respectively.
Is supplied to.

In the master interface 3, when the data signal reproduced by the data recorder 1 is supplied, the time data inserted in this data signal is detected and, for example, a clock in clock units is synchronized with this time data. The circuit 31 is driven. The clock data is supplied from the clock circuit 31 to the latch circuit 32, and the data latched by the latch circuit 32 is supplied to the time difference detection circuit 33. Further, data described later from the slave interface 4 is supplied to the time difference detection circuit 33.

Further, the value detected by the time difference detection circuit 33 is supplied to the control circuit 34. A signal from the operation unit 35 is also supplied to the control circuit 34. This control circuit 34
Is supplied to the latch circuit 32 and the slave interface 4. Further, the command formed by the control circuit 34 is supplied to the data recorder 1 and the slave interface 4.

Further, the signal from the control circuit 34 is supplied to the synchronization generation circuit 36, the generated synchronization signal is supplied to the data recorder 1, and the slave interface 4 is also provided.
Is supplied to. Also, the id detected by the data recorder 1
The value is supplied to the id difference detection circuit 37. Further, the id value from the slave interface 4 which will be described later is detected by the detection circuit 37.
Is supplied to. Then, the value detected by the id difference detection circuit 37 is supplied to the control circuit 34.

Further, in the slave interface 4, when the data signal reproduced by the data recorder 2 is supplied, the time data inserted in this data signal is detected and, for example, a clock in clock units is synchronized with this time data. The circuit 41 is driven. Clock data is supplied from this clock circuit 41 to the latch circuit 42, and this latch circuit 4
The latch signal from the master interface 3 is supplied to 2. Then, the data latched by the latch circuit 42 is supplied to the time difference detection circuit 33.

Further, the command from the master interface 3 is supplied to the control circuit 43. This control circuit 4
The command formed in 3 is supplied to the data recorder 2. Further, the synchronization signal from the master interface 3 is supplied to the delay circuit 44. A control signal from the control circuit 43 is supplied to the delay circuit 44. Then, the synchronizing signal from the delay circuit 44 is supplied to the data recorder 2. Further, the id value detected by the data recorder 2 is directly supplied to the id difference detection circuit 37.

In this system, for example, when the delay amount of the delay circuit 44 is set to "0" and the synchronous operation is performed by the synchronous signal from the master interface 3, the data signals reproduced by the data recorders 1 and 2 are shown in FIG. Of A
And B.

On the other hand, it is assumed that the same time data is inserted at the positions shown in the reproduced data signal. In that case, the clock circuits 31 and 41 respectively output clock data synchronized with the time data. By latching these clock data at arbitrary timing, the time difference detecting circuit 33 detects the time between the time data in clock units. Further, the id difference detection circuit 37 detects a difference in id value in the current operating state.

Therefore, the control circuit 34 first calculates the id value of the difference so that the positions of the time data coincide with each other in the id value, and the calculated value is supplied to the control circuit 43 of the slave interface 4 as a command. As a result, for example, as shown in FIG. 2C, the id value (id _b4 ) of the data signal in which the time data of the data recorder 2 is inserted becomes i of the data signal in which the time data of the data recorder 1 is inserted.
The so-called VTR is calibrated so that it becomes equal to the d value (id _ai ).

However, in this state, there is still a time difference corresponding to the portion indicated by the broken line arrow in the figure. Then, when this time difference is further detected by the time difference detection circuit 33, the control circuit 34 calculates the value of the difference between the synchronization signals so that the positions of the time data match in clock units.

The calculated value is supplied as a command to the control circuit 43 of the slave interface 4. The value of this difference is supplied to the delay circuit 44, and the synchronization signal from the master interface 3 is delayed by this time difference. As a result, for example, the timing of the sync signal is moved as shown in D of FIG. 2, and control is performed so that the position of the time data in the reproduction data signal matches in clock units.

Thus, according to the above-described method, after the synchronous operation of the data recorder is performed by using the synchronization signal on the data recording tape, the synchronization is performed by using the time information in the data, so that the data unit or It is possible to synchronize with the accuracy of the clock unit.

In the above-mentioned system, once the clock-based synchronization is controlled, it operates stably over a long period of time. Therefore, for example, even when a plurality of slave interfaces are used, the latched time data and id value are detected by time division and the command is generated in time division, so that it is possible to cope with them without providing an extra configuration. You can

[0028]

According to the present invention, the data recorder can be easily synchronized by using the time information in the data after synchronizing the data recorder using the synchronization signal on the data recording tape. It is now possible to synchronize with clock-based accuracy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of a system for realizing a data recorder control method according to the present invention.

FIG. 2 is a diagram for explaining the explanation.

[Explanation of symbols]

 1, 2 Data Recorder 3 Master Interface 4 Slave Interface 31 Clock Unit Clock Unit 32 Latch Circuit 33 Time Difference Detection Circuit 34 Control Circuit 35 Operation Unit 36 Synchronization Generation Circuit 37 id Difference Detection Circuit 41 Clock Unit Clock Unit 42 Latch Circuit 43 Control circuit 44 Delay circuit

Claims (4)

[Claims] 1. A data recorder adjusting method for synchronously reproducing a plurality of data recording tapes having time information in the data, wherein the data recorder uses a synchronization signal on the data recording tapes. After the synchronous operation of the above, the data recorder adjustment method is adapted to synchronize by using the time information in the above data. 2. The data recorder adjusting method according to claim 1, wherein the sync signal on the data recording tape reads out a signal recorded in the longitudinal direction of the tape. 3. The data recorder adjusting method according to claim 1, wherein the synchronization using the time information controls a phase of a signal read from a synchronization signal on the data recording tape by a difference of the time information. How to adjust the data recorder. 4. The data recorder adjusting method according to claim 1, wherein after the synchronizing signal recorded in the longitudinal direction on the data recording tape is read to perform the synchronizing operation of the data recorder, the time in the data is recorded. A method for adjusting a data recorder in which the phase of a sync signal read from the sync signal on the data recording tape is controlled by using the difference of information so as to establish the synchronization.