JP2000331417A - Method and device for receiving periodic data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always coincide with a prescribed value by first detecting the changes in data values with a period that is shorter than the period, in which the values are changed, and extracting the data for every prescribed period from the time when the changes are detected. SOLUTION: During a start-up, the received values of data are supplied to a detecting means from a slave side by a transmission request and the change in the received value of a second time unit of a time code is detected, for example. Thus, from the time when the received value of a second time unit is changed, the timing of a transmission request of the time code is set to a one second period. Then, a control signal of a time code transmission request is formed with a one second period and the time code transmitted from the device of the slave side by the request is received. The data received by a transmitting and receiving means 2 are supplied to an extracting means 12 and the extracted time code is supplied to a value forming means 13. Moreover, the code is supplied to a monitoring means 15 to monitor the continuousness of the time code.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for receiving periodic data suitable for use in transmitting a time code between, for example, two recording / reproducing apparatuses. More specifically, the present invention makes it possible to easily and accurately receive data whose value is sequentially changed at a predetermined period formed by one device by the other device.

[0002]

2. Description of the Related Art For example, when performing synchronous operation or editing between two recording / reproducing apparatuses, the time code of one of these apparatuses is detected by the other apparatus. That is, in FIG. 6, for example, when a reproduction signal of the recording / reproducing apparatus integrated camera 61 is supplied to the recording / reproducing apparatus 62 having an editing function to perform editing or the like, for example, reproduction is performed by the recording / reproducing apparatus integrated camera 61 on the slave side. The time code (counter 63) in the received signal is detected by the recording / reproducing device 62 on the master side and is displayed on the counter 64, so that the editing operation or the like can be performed satisfactorily.

Therefore, for example, in a digital device, by connecting a recording / reproducing device integrated camera 61 and a recording / reproducing device 62 with a digital interface 65, information such as a time code can be mutually transmitted between these devices. Transmission is enabled. However, in this case, if the time code information is transmitted frequently, for example, communication on the digital interface 65 may be congested, which may hinder communication of other information. Conversely, if the number of times of transmission of the time code information is reduced, there arises a problem that the display values of the time code counters 63 and 64 become inconsistent due to a transmission gap.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a problem to be solved is to transmit data whose values are sequentially changed at a predetermined cycle. In the case of conventional means, if information is transmitted frequently, communication may become congested and hinder communication of other information. Conversely, if the number of transmissions is reduced, the values may become inconsistent. Is generated.

[0005]

For this reason, in the present invention, a change in data value is first detected in a cycle shorter than a cycle in which the data value is changed, and a predetermined cycle is detected from the time when the change is detected. According to this, information is frequently transmitted temporarily, but the number of transmissions can be reduced in a steady state, and the data is changed when the value changes. Is extracted, so that the values can always be matched.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment of the present invention, data whose values are sequentially changed at a predetermined cycle
Requesting transmission at a cycle shorter than the predetermined cycle, detecting a change in the value of the received data, and requesting transmission at a predetermined cycle from the time when the change in the data value is detected to extract the data. It becomes.

In a second embodiment of the present invention, there is provided a transmitting / receiving means for requesting and receiving transmission of data whose value is sequentially changed at a predetermined period, and requesting transmission at a period shorter than the predetermined period. Detecting means for detecting a change in the value of the received data; and data extracting means for requesting transmission at predetermined intervals from the time when the change in the data value is detected and extracting the data. It is.

FIG. 1 is a functional block diagram showing the configuration of an embodiment of a method and an apparatus for receiving periodic data according to the present invention.

In FIG. 1, this device is provided with a data transmitting / receiving means 2 connected to a slave device (not shown) via a digital interface 1. For example, a control signal of a time code transmission request (polling) is supplied from the detection means 11 to the transmission / reception means 2, and a reception value of data transmitted from the slave device by the transmission request is transmitted to the detection means 11. Supplied. As a result, the detecting means 11 detects, for example, a change in the received value of the time code in units of seconds, and controls the timing of the control signal for the transmission request.

That is, in this apparatus, a time code transmission request is made at a period of, for example, 100 ms at the time of startup, and the reception value of data transmitted from the slave apparatus is supplied to the detecting means 11 by this transmission request. For example, a change in the received value of the time code in units of seconds is detected. And from the time when the received value in the unit of this second changes,
The timing at which the time code transmission request is made is set to a cycle of one second. Thereafter, a control signal for a time code transmission request is formed at a cycle of one second, and the time code transmitted from the slave device is received by this transmission request.

As a result, the data received by the transmission / reception means 2 is supplied to the extraction means 12, and the time code sent from the slave device is extracted. The extracted time code is supplied to the value forming means 13, and a time code converted into, for example, hours, minutes, and seconds is formed.
Further, the formed time code is supplied to the interpolation means 14, and a frame value obtained by, for example, multiplying the unit of seconds by 60 is formed. Then, the time code including the frame value is supplied to the display means 3 and, for example, as shown in FIG. 2, the time code of two digits each of hour: minute: second: frame is displayed.

Further, the time code formed by the above-mentioned value forming means 13 is supplied to the monitoring means 15, and the continuity of the time code is monitored. Here, in the value forming means 13,
For example, the next time code one second after the current time code is formed. The time code one second after this time and the time code formed from the value extracted next are compared by the monitoring means 15, and when they do not match, it is detected that the time code has become discontinuous. When the time code is discontinuous, a reset signal is supplied to the detecting means 11 and the extracting means 12, and the operation is restarted from the first operation.

That is, according to this device, a transmission request of a time code is first made at a period of, for example, 100 ms,
The received time code is displayed on the display means 3, and a change in the received value of the time code in units of seconds is detected. When the change of the value in the unit of second is detected, a time code transmission request is made in a cycle of one second thereafter, and the received time code is displayed on the display means 3. Thus, in the steady state, the display is performed by the transmission request of the cycle of 1 second, and the time difference of the change of the display is 1
The time is set to within 00 m seconds, and a display that substantially matches can be performed.

Therefore, in this apparatus, a change in the data value is first detected in a cycle shorter than the cycle in which the data value is changed, and the data is extracted every predetermined cycle from the time when the change is detected. Although information is frequently transmitted temporarily, the number of transmissions can be reduced in a steady state, and data is extracted when the value changes, so that the values can always be matched.

Thus, in the case of transmitting data whose values are sequentially changed at a predetermined cycle, the conventional means, if the information is transmitted frequently, becomes congested and interferes with the communication of other information. However, according to the present invention, these problems can be easily solved. However, when the number of transmissions is reduced, values may become inconsistent.

In the above-mentioned apparatus, the continuity of the time code is monitored by the monitoring means 15, and when the time code is discontinuous, the detecting means 11 and the extracting means 12 are restarted from the first operation. As a result, when the time code becomes discontinuous due to a blank or the like in the reproduction signal on the slave device, for example, the time code transmission request is made in the above short cycle and the received time code is displayed. In addition to the display by the means 3, after the detection of the change in the value of the unit of second, the transmission of the time code is requested in a cycle of one second, and the time code can be always displayed satisfactorily.

Further, in the above-described apparatus, the interpolating means 14 is provided to form, for example, a frame value of a time code which is equal to or less than a second unit, for example, by interpolating a second unit by 60. In this case, the frame value is not the time code itself transmitted from the slave side, but the display on the transmission side and the display on the reception side are apparently synchronized. When an accurate frame value is required for slow reproduction or the like, a time code transmission request is made at the above-described 100 ms period, and the received time code can be displayed on the display means 3.

Further, in the above-mentioned apparatus, the period at which the transmission of the time code at the time of startup and at the time of steady state is performed is not limited to the above-mentioned 100 ms and 1 second, respectively, but may be faster or slower, respectively. However, if these periods are made faster, communication will be congested, and if they are made slower, the time difference between display changes will increase, or the time taken to detect when the time code is discontinuous will increase. Become.

In the above-described apparatus, the time code is displayed only when the slave apparatus is in the reproducing state.
In this case, the playback state of the slave device can be known through the digital interface 1, for example. Further, the reproduction state is not limited to the normal 1 × speed reproduction, and it is also possible to know a state such as a double speed reproduction or a reverse reproduction at an arbitrary ratio. Therefore, in these variable-speed reproductions, the above-described value forming means 1
The next time code formed at 3 is obtained according to the speed ratio or the like, so that the display at the display means 3 and the monitoring means 1
5, the discontinuity can be detected satisfactorily.

Incidentally, in the above-described apparatus, the detecting means 1
The configuration of 1 to monitoring means 15 can be formed by software in a microcomputer (CPU) 4, for example. FIG. 3 shows a flowchart of the first embodiment of the processing performed by the software.

That is, in FIG. 3, when the operation is started, a transmission request (polling) to the slave side is first performed in step [1]. Next, in step [2], the received value of the time code transmitted from the slave is used as the display value of the time code counter on the master. After a lapse of 100 ms in step [3], a transmission request to the slave side is made again in step [4]. In step [5], it is determined whether the received value of the time code newly transmitted from the slave side is equal to the value obtained by adding one second to the display value of the time code counter on the master side.

If it is determined in step [5] that the received value does not match the value obtained by adding one second to the displayed value (N), the process returns to step [1] and the above-described processing is repeated. Thus, a change in the value of the data is detected at a period of 100 ms. On the other hand, if the received value is equal to the value obtained by adding one second to the display value in step [5] (Y), the value obtained by adding one second to the display value obtained so far in step [6] is the master-side value. This is the display value of the counter. Further, after a lapse of one second in step [7], the process returns to step [4].

Therefore, in this method, first, a change in the data value is detected in a cycle shorter than the cycle in which the data value is changed, and the data is extracted every predetermined cycle from the time when the change is detected. Although information is frequently transmitted temporarily, the number of transmissions can be reduced in a steady state, and data is extracted when the value changes, so that the values can always be matched.

That is, in this method, the change of the value of the time code in seconds is detected and the continuity is monitored in the step [5]. When a predetermined change is not obtained in the time code and the time code is discontinuous, the time code transmission request is made in the above-described short cycle by returning to step [1], and the time code is transmitted in units of seconds, for example. After detecting the change in the value of, a time code transmission request is made in a one-second cycle, and the time code can always be satisfactorily received.

FIG. 4 is a flowchart of a second embodiment of the processing performed by the software.
FIG. 4 shows an embodiment in which frame values are interpolated.

In FIG. 4, when the operation is started, a transmission request (polling) to the slave side is first performed in step [1]. Next, in step [2], the received value of the time code transmitted from the slave is used as the display value of the time code counter on the master. In step [31], a time of 100 ms elapses in the same manner as described above, and a frame interpolation value is formed during this 100 ms. That is, for example, the interpolation value is formed by sequentially increasing the frame value at intervals of 1/60 seconds.

Further, after a lapse of 100 msec in step [31], a transmission request is again made to the slave side in step [4]. In step [5], it is determined whether the received value of the time code newly transmitted from the slave side is equal to the value obtained by adding one second to the display value of the time code counter on the master side. If the received value and the value obtained by adding one second to the display value do not match in step [5] (N), the process returns to step [1] and the above-described processing is repeated. Thus, a change in the value of the data is detected at a period of 100 ms.

On the other hand, when the received value is equal to the value obtained by adding one second to the display value in step [5] (Y), the value obtained by adding one second to the display value obtained so far is obtained in step [6]. This is the display value of the counter on the master side. Then, in step [71], a time of one second elapses in the same manner as described above, and a frame interpolation value is formed during this one second.
That is, for example, the interpolation value is formed by sequentially increasing the frame value at intervals of 1/60 seconds. After a lapse of one second in step [71], the process returns to step [4].

Accordingly, in this method, for example, 1/6 of the time elapses in the above steps [31] and [71].
The frame interpolation value is formed by sequentially increasing the value at 0 second intervals. Then, in step [5] above, the detection of the change of the value of the time code in units of seconds and the monitoring of the continuity are performed, so that the time code can always be properly received.

FIG. 5 is a flowchart of a third embodiment of the processing performed by the software, and FIG. 5 shows an embodiment in which the reverse reproduction is performed.

In FIG. 5, when the operation is started, first, in step [1], a transmission request (polling) to the slave side is performed. Next, in step [2], the received value of the time code transmitted from the slave is used as the display value of the time code counter on the master. Further, after a lapse of 100 msec in step [3], a transmission request to the slave side is made again in step [4].
Then, in step [51], it is determined whether the received value of the time code newly transmitted from the slave side is equal to the value obtained by subtracting one second from the display value of the time code counter on the master side.

When the received value and the value obtained by subtracting one second from the displayed value do not match in step [51] (N)
Returns to step [1] and the above-described processing is repeated. Thus, a change in the value of the data is detected at a period of 100 ms. On the other hand, when the received value is equal to the value obtained by subtracting 1 second from the display value in step [51] (Y),
In step [61], a value obtained by subtracting one second from the display value up to that time is used as the display value of the counter on the master side. Further, after a lapse of one second in step [7], the process returns to step [4].

Therefore, in this method, in the above step [51], the detection of the change of the value of the time code in the unit of second toward the direction of the reverse reproduction and the monitoring of the continuity are performed. When a predetermined change is not obtained in the time code and the time code is discontinuous, the time code transmission request is made in the above-described short cycle by returning to step [1], and the time code is transmitted in units of seconds, for example. 1 after detecting the change in the value of
A time code transmission request is made in a cycle of seconds, so that the time code can always be satisfactorily received, and a value subtracted by one second is formed.

Thus, according to the above-described method of receiving periodic data, with respect to data whose value is sequentially changed at a predetermined cycle, a change in the value of data received by requesting transmission at a cycle shorter than the predetermined cycle is obtained. , And by requesting transmission at predetermined intervals from the point in time when a change in the value of data is detected and extracting data, information is frequently transmitted temporarily, but in the steady state, the number of transmissions is increased. As well as extracting data when the value changes,
Values can always be matched.

According to the above-mentioned periodic data receiving apparatus, there is provided a transmitting / receiving means for requesting and receiving data whose value is sequentially changed at a predetermined period, and a request for transmitting at a period shorter than the predetermined period. Detecting means for detecting a change in the value of the data received and data extracting means for requesting transmission at predetermined intervals from the time when the change in the data value is detected and extracting the data, Although information is temporarily transmitted frequently, the number of transmissions can be reduced in a steady state, and data is extracted when the value changes, so that the values can always be matched.

In the above description, a case has been described in which, for example, a time code in a signal reproduced by a recording / reproducing apparatus integrated camera as a slave is received by a recording / reproducing apparatus having an editing function as a master. But,
This can be applied to, for example, reception of a time code between a recording / reproducing device and a remote control device. In addition, the recording / reproducing device is not limited to a device using a tape as a recording medium,
It can be applied to an apparatus using a disk.

The present invention is also generally applicable to the case where the display of two watches is synchronized.

Further, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0039]

Therefore, according to the first aspect of the present invention, a change in the value of data is first detected in a cycle shorter than the cycle in which the value of data is changed, and the change is detected every predetermined cycle from the time when the change is detected. By extracting data, information is frequently transmitted temporarily, but the number of transmissions can be reduced in a steady state, and data is extracted when the value changes. Can be done.

Further, according to the second aspect of the present invention, a value which is sequentially changed at a predetermined cycle is formed from the extracted data,
By monitoring the continuity of the formed values and detecting a change in the data value in a short cycle when the formed values become discontinuous and re-extracting the data, for example, the time code may be When it becomes continuous, a time code transmission request is made in the above-described short cycle, and a time code transmission request is made in a predetermined cycle after detecting a change in a value in units of seconds. Display can be performed.

Further, according to the third aspect of the present invention, a value which is sequentially changed at a predetermined cycle is formed from the extracted data,
By interpolating a value during a predetermined period from the formed value and a signal obtained by multiplying the predetermined period, and monitoring the continuity of the formed value, when the formed value becomes discontinuous, By detecting a change in the value of data in a short cycle and re-extracting the data, a frame value of, for example, a time code of a unit of seconds or less can be formed by interpolation in which the unit of seconds is multiplied.

Further, according to the invention of claim 4, a value which is sequentially changed at a predetermined cycle is formed from the received data,
By displaying the value thus formed, the time code can always be displayed satisfactorily.

According to the fifth aspect of the present invention, first, a change in the data value is detected in a cycle shorter than the cycle in which the data value is changed, and the data is detected every predetermined cycle from the time when the change is detected. , The information is frequently transmitted temporarily, but the number of transmissions can be reduced in the steady state, and the data is extracted when the value changes. You can do it.

Further, according to the invention of claim 6, value forming means for forming a value sequentially changed at a predetermined cycle from the extracted data, and monitoring means for monitoring the continuity of the formed value. When the time code becomes discontinuous, for example, when the time code becomes discontinuous, the transmission request of the time code is issued by restarting the detecting means and the data extracting means when the formed value becomes discontinuous. At the same time, after detecting a change in the value in units of seconds, a time code transmission request is made at a predetermined cycle, so that the time code can always be displayed satisfactorily.

Further, according to the invention of claim 7, value forming means for forming a value which is sequentially changed at a predetermined cycle from the extracted data, and a signal formed by multiplying the formed value by a predetermined cycle. Interpolating means for interpolating values during a predetermined period, and monitoring means for monitoring the continuity of the formed values are provided, and when the formed values become discontinuous, the detecting means and the data extracting means are provided. By restarting, for example, a frame value that is equal to or less than the second unit of the time code can be formed by interpolation in which the second unit is multiplied, for example.

According to the eighth aspect of the present invention, there are provided value forming means for forming a value which is sequentially changed at a predetermined cycle from the extracted data, and display means for displaying the formed value. The time code can always be displayed satisfactorily.

Thus, in the case where data whose value is sequentially changed at a predetermined cycle is transmitted, the conventional means may cause communication congestion if information is transmitted frequently, which may hinder communication of other information. However, according to the present invention, these problems can be easily solved. However, when the number of transmissions is reduced, values may become inconsistent.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a periodic data receiving apparatus to which the present invention is applied.

FIG. 2 is a diagram for explaining the operation.

FIG. 3 is a flowchart of a first embodiment of a periodic data receiving method according to the present invention;

FIG. 4 is a flowchart of a second embodiment of a periodic data receiving method to which the present invention is applied.

FIG. 5 is a flowchart of a third embodiment of a periodic data receiving method to which the present invention is applied.

FIG. 6 is a diagram for explaining the overall configuration.

[Explanation of symbols]

1. Digital interface, 2. Transmission / reception means, 3.
Display means, 4 ... microcomputer (CPU), 11
... Detecting means, 12 extracting means, 13 value forming means, 14
... Interpolation means, 15 ... Monitoring means

Claims (8)

[Claims] 1. A method for detecting a change in the value of data received by requesting transmission in a cycle shorter than the predetermined cycle for data whose value sequentially changes in a predetermined cycle, A request for transmission for each of the predetermined periods from the point in time when the change is detected, and extracting the data. 2. The method for receiving periodic data according to claim 1, wherein a value that is sequentially changed at the predetermined period is formed from the extracted data, and the continuity of the formed value is monitored. A method of receiving periodic data, comprising: detecting a change in the value of the data in the short cycle when the formed values become discontinuous, and re-extracting the data. 3. The method for receiving periodic data according to claim 1, wherein a value that is sequentially changed in the predetermined cycle is formed from the extracted data, and the formed value is multiplied by the predetermined cycle. Interpolating the value during the predetermined period from the signal and monitoring the continuity of the formed value, and when the formed value becomes discontinuous, the value of the data A method for receiving periodic data, comprising detecting a change and re-extracting the data. 4. The method for receiving periodic data according to claim 1, wherein a value that is sequentially changed at the predetermined period is formed from the received data, and the formed value is displayed. How to receive periodic data. 5. A transmission / reception means for requesting and receiving transmission of data whose value is sequentially changed at a predetermined period, and a change of a value of the data received and requested for transmission at a period shorter than the predetermined period. Detecting means for detecting the change in the value of the data, and data extracting means for requesting transmission at every predetermined cycle from the time when the change in the value of the data is detected and extracting the data. Receiver. 6. The receiving apparatus for periodic data according to claim 5, wherein: value forming means for forming a value which is sequentially changed in the predetermined cycle from the extracted data; Monitoring means for monitoring, wherein the detecting means and the data extracting means are restarted when the formed values become discontinuous, wherein the receiving means receives periodic data. 7. The periodic data receiving apparatus according to claim 5, wherein: a value forming unit that forms a value that is sequentially changed in the predetermined cycle from the extracted data; An interpolating unit for interpolating a value during the predetermined period from a signal obtained by multiplying a period, and a monitoring unit for monitoring continuity of the formed value are provided, so that the formed value becomes discontinuous. Receiving the periodic data when the detecting means and the data extracting means are restarted. 8. The receiving device for periodic data according to claim 5, wherein: value forming means for forming a value which is sequentially changed in the predetermined period from the extracted data; and a display for displaying the formed value. Means for receiving periodic data.