JP2002184057A - Medium controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium controller capable of quick and highly accurate searching a program. SOLUTION: When a DV camera to be a reproducing device is newly connected to a personal computer(PC) to be a medium controller, a control circuit 6 to be control means for the PC detects a response delay section, generated at the time of stepwise switching a winding speed, from 'sfast forward' to 'frame feed' and sets up a winding section corresponding to 'reproducing fast forward' to 'frame feed'. When a start position TC and a destination TC are set up in order to search a program, the circuit 6 sets up a switching position TC, corresponding to the winding section from the side close to the destination TC according to both the TC sections and controls program search, while stepwise switching the winding speed on the basis of the switching position TC. Consequently program search on an accurate position can be attained, while shortening program search time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a medium control device for performing cueing control of a medium such as a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, a personal computer is connected to a digital video camera (DV camera) that can be controlled by an external input, and data such as video and audio is recorded by controlling the DV camera with the personal computer. There is a magnetic tape editing system for editing a magnetic tape. This magnetic tape editing system is generally configured such that different DV cameras can be connected to one specific personal computer, or a plurality of DV cameras can be connected at the same time so that a magnetic tape can be edited. Have been.

When performing such editing work, it is necessary to perform accurate cueing control at an arbitrary position on the magnetic tape. Therefore, the recording method of the magnetic tape includes a position control together with video and audio data. A recording format capable of recording information, for example, a digital video format (D
V format). In the DV format, video data including audio is digitally recorded in frame units, and a time code as position information is recorded for each frame in ascending order, for example.

The cueing control of the magnetic tape by the personal computer is performed by the following method. In the personal computer, first, the time code (destination TC) at the cueing position is set, and then the time code of the magnetic tape located at the time code detection unit formed on the head of the DV camera is set at the winding start position (start position). TC). Then, a magnitude comparison between the start position TC and the destination TC is performed,
When the start position TC is smaller, cueing control in the “feed direction” is set, and when the start position TC is opposite, cueing control in the “return direction” is set.

For the sake of simplicity, only the case where the cueing control is set to the "feed direction" will be described below, and the case where the cue control is set to the "return direction" will be described as being the same. Omitted. In addition, the DV camera can set five different winding speeds. In the case of the “feeding direction”, “fast forward”, “playback fast forward”, “playback”, and “slow playback” are performed in ascending order of winding speed. And "frame advance" can be set in this order.

When performing the cueing control, the personal computer switches the winding speed stepwise from a high-speed side to a low-speed side in a maximum of five steps in accordance with the section length between the start position TC and the destination TC. It is set as follows. The winding speed switching setting is performed by setting a time code (switching position TC) at a position where the winding speed is switched.
Is uniquely set for the destination TC. In other words, a standard value is set in advance as a relative section length for the winding section from “playback fast forward” to “frame advance”, and the standard value is set according to the section length between the start position TC and the destination TC. Each switching position TC is set so as to be assigned.

FIG. 9 (a) shows an example of the positional relationship of the switching position TC set based on the standard value when performing the cueing control in the "feed direction". This figure 9
In (a), the start position TC (position A) and the destination TC
Each switching position TC (positions B to E) is set based on the section length between (position F), whereby the winding speed is set to be switched in five steps.

[0008] Thereafter, the personal computer intermittently detects the time code (current position TC) and outputs the DV code.
The take-up control of the magnetic tape set in the camera is performed. Then, by sequentially comparing the detected current position TC with the switching position TC, the cueing control is performed such that the winding speed is switched stepwise and finally the winding at the destination TC is finally stopped.

[0009]

By the way, when this cueing control is performed, the time from when the magnetic tape switching position TC reaches the time code detecting section of the DV camera until the winding speed of the DV camera is switched. Causes a time lag (response delay). This is the switching position TC on the personal computer.
Due to a delay in electrical processing time when detecting speed, outputting a speed command for switching the winding speed, etc., or a delay in mechanical response time when switching the winding speed in a DV camera. It is. Then, in the conventional personal computer, the winding section corresponding to the "fast forward playback" to the "frame forward" is set based on a standard value in consideration of the response delay section.

However, even if the DV cameras are of the same model, there is an individual difference for each product, so that it is expected that the response delay sections also differ. Therefore, for example, in the case where a plurality of DV cameras are connected to one personal computer at the same time to perform an editing operation, the cueing control is performed based on the winding section set by the conventional method. The switching position TC is not always the optimum position for each DV camera, and there has been a problem that it is not possible to locate the head at an accurate position.

FIGS. 9 (b) and 9 (c) show winding sections (BC, C) set by the personal computer based on the standard values.
Since the response delay section (for example, B-C1, C-F1 section) unique to the DV camera is longer than the -D, DE, and EF sections, the set switching position TC is not optimal. Disappears and the destination T at which the cue position of the magnetic tape is set
It shows an example of a case where C exceeds C.

First, as shown in FIG. 9 (b), in the personal computer, when a switching position TC from "fast forward" to "reproduction fast forward" is detected at position B, at position B1 after a slight response delay section has elapsed. Then, a speed command for switching the winding speed to "playback fast forward" is output. Then, in the DV camera, the take-up speed is switched to "playback fast forward" at the position C1 after a further response delay section has elapsed after receiving the speed command. Therefore, in this case, the response delay section (between B and C1) is longer than the preset “reproduction fast forward” winding section (between B and C), and the winding speed is “reproduction fast forward”. At the position C1 at the point when the operation has been started, the operation has already entered a section in which the winding speed of the magnetic tape must be set to “reproduction”.

In this case, in the personal computer, as shown in FIG. 9 (c), at the position C1, it is determined that the current position TC has already exceeded the switching position TC (position C) from "reproduction fast forward" to "reproduction". Is performed, and after a lapse of a slight response delay section, a speed command for switching the winding speed to “reproduction” at the position C2 is output. Then, in the DV camera, after a further response delay section elapses after receiving the speed command, the winding speed is switched to “reproduction” at the position F1. However, in this case, the position F1 has already exceeded the destination TC, and thereafter, after the winding speed is switched to “slow playback” and “frame feed”, the winding operation is finally performed. The stop position greatly exceeds the set destination TC (position F).

On the other hand, when the response delay section unique to the DV camera is shorter than the winding section set by the personal computer, the set switching position TC is not optimal. Although not shown, since the winding amount at the high-speed winding speed is reduced, a problem that the cueing control is delayed occurs.

Therefore, in the conventional personal computer, by setting a value having a sufficiently large margin for the average response delay section of each device as the standard value, the time required for the cueing control becomes longer. However, it was trying to find the exact position at the set position.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a medium control device capable of performing cueing control with high accuracy in a short time.

[0017]

According to a first aspect of the present invention, there is provided a medium control apparatus, wherein two or more different speeds are gradually switched from a high speed to a low speed while intermittently detecting position information recorded on a medium. In a medium control device including control means for performing cueing control of the medium, the control means detects a response delay section from a speed switching position to a speed switching position based on the position information, A switching position for performing the cueing control is set based on the response delay section.

According to such a configuration, the control means can accurately detect the response delay section. By setting the switching position based on the detected response delay section, it is possible to increase the amount of winding at the high-speed winding speed. Cueing can be performed at an appropriate position. This allows
For example, even if a response delay section differs due to a variation in performance of each product, an optimum switching position can be set according to a response delay section unique to each medium control device. The influence can be canceled, and the head of the medium can always be efficiently searched for in a short time and with high accuracy.

In the magnetic tape control device according to the second aspect,
The medium is played by a playback device configured to be controllable by an external input, and the control unit includes:
When the playback device is newly connected, the response delay section is detected.

According to such a configuration, the control means can accurately detect a unique response delay section combining the media control device and the playback device in a state where the two devices are connected. By setting the switching position based on the detected response delay section, it is possible to increase the winding amount at the high-speed winding speed. Cueing can be performed. Thus, even if a difference in response delay section occurs due to a variation in performance for each combination of the connected media control apparatus and the playback apparatus, for example, an optimum switching position is determined according to a unique response delay section for both apparatuses. Since the setting can be made, the influence due to the difference in the response delay section can be canceled, and the cueing of the medium can always be efficiently performed in a short time with high accuracy for all combinations of both devices. In addition, the control unit sets the switching position when the playback device is newly connected to the medium control device, so that it is possible to save the trouble of setting the switching position in the subsequent normal editing work.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the medium control device of the present invention is applied to a magnetic tape editing system will be described below with reference to FIGS.

FIG. 2 shows a magnetic tape editing system 2 for editing a magnetic tape 1 as a medium. In FIG. 2, a personal computer 3 as a medium control device has a monitor 3b and a keyboard 3 on a personal computer main body 3a.
c and a mouse 3d are connected to each other. Although not shown, a motherboard on which a CPU, a memory, and the like are mounted is mounted in the personal computer main body 3a, and data is transferred to a hard disk or a storage medium (floppy (registered trademark) disk, CD, DVD, or the like). A storage medium drive for reading and writing, a video card for sending a video signal to a monitor, and external devices and IEEE13
IEEE139 for performing data communication according to the 94 system
4 control boards (hereinafter simply referred to as control boards)
Are mounted so as to be connected to the motherboard. Then, software for controlling the entire editing work is written in the CPU.

A handy type digital video camera (hereinafter simply referred to as a DV camera) 5 as a reproducing apparatus is connected to the personal computer 3a via a communication cable 4. Specifically, a control board (not shown) is also mounted on the DV camera 5, and both control boards of the personal computer 3 and the DV camera 5 are configured to be capable of bidirectional communication via the communication cable 4. I have. This communication is AV /
It is configured to be performed by the C command method.

Although not shown, the DV camera 5 has a data recording section for recording video and audio data on the magnetic tape 1, a data reproducing section for reproducing the data from the magnetic tape, and a winding section for winding the magnetic tape. A small liquid crystal display device that can be used as a mechanism, a time code detector that detects a time code (described later) as position information of the magnetic tape formed on the magnetic head, a finder during data recording, and a monitor during data reproduction; It is composed of a microphone for recording, a speaker for reproduction, and the like.

A digital video format (hereinafter, simply referred to as DV format) is adopted as a recording method of the DV camera 5 on a magnetic tape.
In the DV format, video data including audio is recorded digitally in frame units, and a time code as position information is recorded in ascending order, for example, for each frame.

Further, the DV camera 5 is configured such that the winding speed, which is the speed of the magnetic tape 1, can be switched in five stages.
For example, for the “feed direction”, the winding speed can be set in the order of “fast forward”, “playback fast forward”, “playback”, “slow playback”, and “frame forward” from the fastest one, and the “return direction” Although the description is omitted, five winding speeds can be set in the same manner.

The magnetic tape editing system 2 is constituted by the personal computer 3 and the DV camera 5, and the personal computer 3 controls the DV camera 5 based on the bidirectional communication between the two control boards by the AV / C command system. By
The magnetic tape 1 is configured to be edited (recording, playback, cueing, etc.). Although FIG. 2 shows a state in which one DV camera 5 is connected to the personal computer 3, a plurality of DV cameras 5 are connected to the personal computer 3 at the same time and each DV camera 5 is individually controlled. Editing work is also possible.

Next, FIG. 1 is a block diagram of a control circuit 6 which is a control means mainly composed of a CPU of the personal computer 3 and software executed by the CPU. Hereinafter, the main functions of each unit will be briefly described, and details of the functions will be described in the operation described later.

The condition setting section 6a includes a winding speed S and T for detecting a response delay section, an XY section (all described later), and a head section based on inputs from the keyboard 3c and the mouse 3d. Destination TC when performing the outgoing control (described later)
And the like, and the set condition values are recorded in the recording unit 6b.
And the like. Speed command section 6c
Is a DV based on the winding speed recorded in the recording unit 6b.
It has a function of generating a speed command for controlling the winding speed of the camera 5 and outputting this speed command to the reproduction control unit 6d.

The reproduction control unit 6d converts the speed command received from the speed command unit 6c into an AV / C command, and outputs the converted AV / C command to the DV camera 5 via the communication cable 4 between the control boards. And so on. The state detection unit 6e has a function of detecting a current position TC (described later) and a winding speed of the magnetic tape 1 by performing bidirectional communication with the DV camera using an AV / C command.

The winding section setting section 6f detects a response delay section, calculates a winding section (described later) based on the detected response delay section, and records the calculated winding section in the recording section. (Setting). When performing the cueing control, the switching position setting unit 6g sets the start position TC
(Described later), and configured to set a switching position TC (described later) based on the destination TC and the winding section.

The condition setting section 6a and the recording section 6
b, speed command section 6c, reproduction control section 6d, state detection section 6
e, the winding section setting section 6f and the switching position setting section 6g constitute the control circuit 6.

[Explanation of Operation] Next, the operation relating to the cueing control by the personal computer 3 will be described. For the sake of simplicity, only the case where the winding control is set to the "feed direction" will be described below, and the case where the winding control is set to the "return direction" will be the same and will not be described. And

<Definition of Response Delay Section and Switching Position>
First, terms used in this embodiment will be described. First, the time code detected by the time code detection unit at the start of winding of the magnetic tape is set to the start position TC, the time code set as the position at which the winding speed is switched during the cueing control is set to the switching position TC, and The time code set as the cueing position is set as the destination TC, the time code detected by the time code detector during the winding control of the magnetic tape is set as the current position TC, and the winding speed is switched when the response delay section is detected. Time switch T
Defined as C.

Next, the definition of the response delay section will be described. FIG. 3A shows a positional relationship between each winding speed and each time code set in association with the magnetic tape 1. The value of the time code on the magnetic tape 1 increases from the left side to the right side in FIG. Then, the start position TC is set to the position X, the speed switching TC is set to the position Y, and the winding speed in the section (XY section) from the position X to the position Y is set to the winding speed S,
The winding speed after the position Y is set to the winding speed T,
These winding speeds have a relationship of winding speed S> winding speed T.

The magnetic tape 1 by the control circuit 6 in this case
Is performed as follows. The operation of each unit in the control circuit 6 will be described later. First, XY
In the section, a speed command of the winding speed S is output from the control circuit 6, and the DV tape 5 winds the magnetic tape 1 at the winding speed S. During this winding operation, the time code is intermittently detected by the control circuit 6, and the speed switching T
When C is detected, the speed command is switched to the winding speed T. At this time, the position at which the speed command of the winding speed T is output from the control circuit 6 is, as shown in FIG. The position Y1 is a position Y1 after a lapse of a slight response delay section with respect to (position Y).

Next, the DV camera 5 switches from the winding speed S to the winding speed T based on the speed command.
At this time, the position at which the winding speed of the DV camera 5 is switched to the winding speed T is, as shown in FIG. 3C, the position Y1 due to a response delay such as a mechanical processing time in the DV camera 5. Becomes the position Y2 after a further response delay section has elapsed.

As described above, during the winding control at the winding speed S, the time switch TC of the magnetic tape 1 is transmitted to the time code detecting section.
When the winding speed of the DV camera 5 is switched to the winding speed T after the arrival of, the response delay based on the performance unique to the personal computer 3 and the DV camera 5 occurs. Therefore, during the response delay period, a section in which the winding speed S of the magnetic tape 1 reaches the time code detection unit after the winding speed S reaches the time code detection unit, and a section in which the winding speed of the DV camera 5 is switched ( Y-
Y2 section) is defined as a response delay section.

<Explanation of Operation Related to Detection of Response Delay Section>
By the way, when the DV camera 5 is newly connected to the personal computer 3, the response delay section is detected as an initial setting by an input from the keyboard 3c or the mouse 3d by the user.
In addition, a winding section (described later) for performing the cueing control is set. This initial setting is the same combination of PC3
And the DV camera 5 are connected only for the first time, and only need to be performed once. The winding section calculated at the time of the initial setting is recorded (set) in the recording unit 6b. When the DV camera 5 is reconnected, the cueing control is performed based on the set winding section.

FIGS. 4 and 5 are flowcharts showing a method of detecting a response delay section in the "feed direction" and a method of setting a winding section. First, in FIG. 4, in steps S1 to S3, detection of a response delay section when switching from "fast forward" to "playback fast-forward" and setting of a winding section corresponding to "playback fast-forward" during cueing control are performed. Will be The winding section is obtained by adding 10% of the margin to the response delay section.

First, in step S1, the condition setting section 6a sets the keyboard 3c or the mouse 3d by the user.
The winding speeds S and T and the XY section length corresponding to FIG. Here, “fast forward”, “playback fast forward”, and “0”
0: 02: 00: 0 "is set, and is temporarily recorded in the recording unit 6b. In addition, as the XY section length, the positions X to
The time code between position Y is "hour: minute: second: frame number"
A time-converted value is set as shown in FIG. Here, the number of frames means the number of frames switched per second when reproducing the magnetic tape 1. In the case of the DV camera 5 of the present embodiment, 30 frames are switched per second. The value of the number is set in the range of 0 to 29.

Subsequently, the flow shifts to step S2, where a response delay section is detected. The detection of the response delay section is performed based on the winding control method shown in the flowchart of FIG. First, in step T1, the speed command unit 6c
Then, the take-up stop command is output to the playback control section 6d, and the playback control section 6d converts the take-up stop command into an AV / C command and outputs it to the DV camera 5. When the AV / C command is output from the DV camera 5 in response to this, the state detection unit 6e receives the AV / C command, detects that the winding speed is zero, and It is confirmed that the taking operation is stopped.

Next, in the state detecting section 6e, the DV camera 5
The start position TC is detected by performing the communication with the control unit 1 and the start position TC is output to the winding section setting unit 6f (step T2). Then, in the winding section setting section 6f, the start position TC and the XY recorded in the recording section 6b are set.
Based on the section (“00: 02: 00: 00”), the speed switching TC (corresponding to the position Y in FIG. 3A) as the position for switching from the winding speed S to the winding speed T is calculated. I,
The calculated speed switching TC is output to the state detection unit 6e (Step T3).

Subsequently, in the speed command section 6c, the recording section 6b
The winding speed S ("fast forward") recorded in the
A speed command based on the winding speed S is output to the DV camera 5 via the reproduction control unit 6d (step T4). As a result, the DV camera 5 starts the winding operation of the magnetic tape 1, and the winding speed is accelerated to the winding speed S and is stabilized.
The state detection unit 6e intermittently detects the current position TC of the magnetic tape 1 after the start of the winding operation of the DV camera 5 (step T5) and determines whether the current position TC has reached the speed switching TC. A determination (step T6) is made. The loop operation between steps T5 and T6 is repeatedly performed until the detected current position TC reaches the speed switching TC, and when the current position TC reaches (matches or exceeds), the process proceeds to step T7.

At step T7, the speed command unit 6
In c, a speed command T based on the winding speed T (“playback fast forward”) recorded in the recording unit 6b is output to the DV camera 5 via the playback control unit 6d (the position Y1 in FIG. 3B). Equivalent). Thereby, in the DV camera 5, the winding speed of the magnetic tape 1 is switched, and the winding speed is reduced to the winding speed T and stabilized. Then, the state detection unit 6e intermittently detects the winding speed of the DV camera 5 after the output of the speed command T from the speed command unit 6c (step T8).
Then, it is determined whether the winding speed has been reduced to the winding speed T (step T9). This step T8 to T9
Is repeatedly performed until the detected winding speed matches the winding speed T.
Move to 10.

At step T10, the state detecting section 6e detects the current position TC at the time when the winding speed T is detected.
(Corresponding to the position Y2 in FIG. 3 (c)) is detected, and the current position TC is switched and output to the winding section setting unit 6g as TC. Then, in the winding section setting unit 6g, a time-converted value of the time code of the section from the speed switching TC to the switching TC is calculated as the response delay section, and is temporarily recorded in the recording unit 6b (step T11). ).

Referring again to FIG. 4, when the detection of the response delay section at the time of switching from "fast forward" to "playback fast forward" is completed as described above, the process proceeds to step S3, where the winding is performed. In the section setting section 6f, a value obtained by adding 10% as a margin to the response delay section is calculated as a winding section corresponding to "playback fast forward" at the time of cueing control, and is recorded (set) in the recording section 6b. .

Similarly, in steps S4 to S6, detection of a response delay section when switching from "playback fast forward" to "playback" and setting of a winding section corresponding to "playback" during cueing control. In steps S7 to S9, detection of a response delay section when switching from "reproduction" to "slow reproduction" and setting of a winding section corresponding to "slow reproduction" during cueing control are performed. In steps S10 to S12,
A response delay section when switching from "slow playback" to "frame feed" is detected, and a winding section corresponding to "frame feed" during cueing control is set.

Here, Table 1 shows an example of the winding speeds S and T set for detecting each response delay section, and an XY section. Table 1 Setting values for detecting each response delay section

[Table 1]

Table 2 shows an example of a response delay section detected based on each set value in Table 1 and a winding section calculated based on the response delay section. Table 2 Response delay section and winding section

[Table 2]

<Explanation of Function of Cueing Control> Next, cueing control during normal editing work will be described. FIG.
FIG. 7 is a flowchart showing a cueing control method, and FIG. 7 is a flowchart showing a speed command setting method. First, in step U1 of FIG. 6, the condition setting unit 6a
In FIG. 8A, the destination TC is input by the user through the keyboard 3c or the mouse 3d.
(Position M) is set. Subsequently, the start position TC (position H) is detected by the state detection unit 6e (step U2). Then, the switching unit 6g switches the recording unit 6
The winding section corresponding to each winding speed set in b is read, and the switching position TC is set based on the section length between the start position TC and the destination TC (step U3).

The setting of these switching positions TC depends on the starting position T
The setting is performed from the side closer to the destination TC according to the section length between C and the destination TC. Specifically, FIG.
In (a), first, the time code obtained by subtracting the amount corresponding to the winding section of “frame feed” from the destination TC (position M) is the switching position T from “slow playback” to “frame feed”.
It is set as C (position L). Next, the switching position TC
A time code obtained by subtracting the amount corresponding to the winding section of “slow reproduction” from (position L) is set as a switching position TC (position K) from “reproduction” to “slow reproduction”. Hereinafter, similarly, a switching position TC (position J) from “reproduction fast-forward” to “reproduction” and a switching position TC (position I) from “fast-forward” to “reproduction fast-forward” are sequentially set. At this time, the winding speed is set in five stages from "fast forward" to "frame forward".

Here, for example, when the destination TC is "00: 0"
5:00:00 ", and the value of the switching position TC when the winding section is set to the value shown in Table 2 is as shown in Table 3. Table 3 Response delay section and winding section

[Table 3]

When the section length between the start position TC and the destination TC is short, the switching position TC is set in a direction in which the number of winding speed switching steps decreases. For example, in FIG. 8A, when the start position TC is set between the positions I to J, the winding speed is set to four stages from “reproduction fast-forward” to “frame advance” and corresponds to the position I. Is not set.

Next, by a loop operation between steps U4 to U11 in FIG. 6, a cueing control for finally stopping the winding at the destination TC while switching the winding speed of the DV camera in a stepwise manner. Done.

More specifically, first, in step U4, the current position TC is detected by the state detector 6e. Then, a comparison is made as to whether the detected current position TC and the destination TC match (step U5). If it is determined that they match, the process proceeds to step U12, where the speed command unit 6c outputs The take-up stop command is issued by the playback control
Is output to the DV camera 5 via the camera, and the cueing control is completed. If it is determined that they do not match, the process proceeds to step U6, where the speed command section 6c sets a speed command for switching the winding speed. The setting of the speed command is performed based on the flowchart of FIG.

First, at step V1 in FIG. 7, the speed command section 6c determines whether or not the current position TC is smaller than the switching position TC (position I) from "fast forward" to "playback fast forward". Is determined, "fast-forward" is set as the speed command (step V2). If it is determined that the speed is not small, the process proceeds to step V3.

Hereinafter, in steps V3, V5 and V7,
The same comparison as in step V1 is performed, and “speed-forward playback” (step V4), “playback” (step V6), and “slow playback” (step V8) are set as speed commands. If none of the steps V1, V3, V5 and V7 is applicable, "frame feed" is used as the speed command.
(Step V9) is set.

When the setting of the speed command is completed as described above, the state detector 6e detects the winding speed (step U7 in FIG. 6) and checks whether the detected winding speed matches the speed command. A determination (step U8) is made. The loop operation between steps U4 to U8 is repeatedly performed while the detected winding speed matches the speed command, and when the winding speed no longer matches, the process proceeds to step U9.

At step U9, the speed command section 6c outputs the speed command set at step U6 to the DV camera via the reproduction control section 6d. Subsequently, the state detection unit 6e detects the winding speed (Step U10) and determines whether the detected winding speed matches the speed command (Step U11). These steps U10 to U1
The loop operation between 1 and 1 is repeatedly performed until the detected winding speed matches the speed command, and when the detected winding speed matches, the process proceeds to step U4.

FIGS. 8B to 8F show that the winding operation of the DV camera 5 is finally switched at the destination TC while the winding speed of the DV camera 5 is switched stepwise by the above-described loop operation between steps U4 to U11. It is a timing chart which shows a mode until picking stops.

As described above, in the present embodiment, the PC 3
When the V camera 5 is newly connected, a response delay section when the winding speed is switched stepwise from “fast forward” to “frame forward” is detected, and “reproduction fast forward” is performed based on the response delay section. In addition, a winding section corresponding to “frame feed” is set. At the time of the cueing control, the switching position TC based on the winding section from the side closer to the destination TC according to the section length between the set start position TC and the destination TC.
Is set, and the cueing is performed by switching the winding speed stepwise based on the switching position TC.

According to such a configuration, the control circuit 6
When the personal computer 3 and the DV camera 5 are connected, a unique response delay section combining the two devices 3 and 5 can be accurately detected. Therefore, in the conventional personal computer, a value having a sufficiently large margin with respect to the average response delay section of the apparatus is set as the winding section (standard value). The switching position TC can be set based on the response delay section. By performing the cueing control based on the switching position TC, it is possible to increase the amount of winding at the high-speed winding speed. Cueing can be performed.

In this way, even if a response delay section differs due to a variation in performance for each combination of the personal computer 3 and the DV camera 5 to be connected, for example, the inherent response delay of the two devices 3 and 5 is combined. Since the optimum switching position TC can be set according to the section, the influence of the difference in the response delay section can be canceled, and the cueing of the magnetic tape can be always performed for all the combinations of both devices 3 and 5. It can be performed efficiently and with high accuracy in a short time.

In addition, the control circuit 6 detects the response delay section when the DV camera 5 is newly connected to the personal computer 3, so that the time required to detect the response delay section during the subsequent normal editing work is reduced. Can be omitted.

The present invention is not limited to the above embodiment, but can be modified and expanded as follows. In this embodiment, the medium is applied to a magnetic tape. However, the present invention is not limited to this, and may be applied to a disk-type recording medium such as a CD or DVD. Further, in the present embodiment, the medium is applied to a magnetic tape on which data is recorded and reproduced digitally. However, the present invention is not limited to this, as long as position information can be detected. You may apply to what is recorded and reproduced.

In this embodiment, the medium controller is connected to the reproducing apparatus for reproducing the medium, and the cueing control of the medium is performed by controlling the reproducing apparatus by the medium controller. However, the present invention is not limited to this. Instead, the medium may be configured to perform the cueing control of the medium in the medium control apparatus having the function of reproducing the medium. In the present embodiment, the winding speed of the reproducing apparatus is configured to be set in five steps. However, the present invention is not limited to this.

In the present embodiment, the detection of the response delay section is manually performed when the reproducing apparatus is connected to the medium control apparatus. However, the present invention is not limited to this. The connection of the device may be automatically recognized, and the response delay section may be automatically detected. In the present embodiment, the detection of the response delay section is performed only when a playback device is newly connected to the medium control device. However, the present invention is not limited to this. The response delay section may be detected in parallel with the execution.

In this embodiment, the winding section is obtained by adding 10% of the margin to the response delay section. However, the margin is not limited to 10%, but may be set to an arbitrary ratio. Further, for example, even if the winding speed of the reproducing apparatus is constant, if the winding speed greatly changes according to the remaining amount of tape wound on the reel of the magnetic tape, the amount of the change is also taken into consideration. Just set the margin. Furthermore, the recordable time of the magnetic tape is, for example, 60 minutes,
If it is known in advance that there are a plurality of such as 120 minutes, it is expected that the winding speed will fluctuate according to the amount of magnetic tape possessed. In such a case, recording is possible. An appropriate margin may be set according to time.

[0070]

As is apparent from the above description, the medium control device of the present invention detects a response delay section when switching the winding speed, and based on the response delay section, starts from the side near the cue position. Since the cue is performed by setting the switching position and switching the switching speed stepwise based on this switching position, the amount of winding at the high-speed winding speed can be increased, and It is possible to perform cueing at an accurate position while shortening the cueing time.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control unit according to the present embodiment.

FIG. 2 is a configuration diagram of a magnetic tape editing system;

FIG. 3 is a timing chart when a response delay section is detected.

FIG. 4 is a flowchart showing a method for detecting a response delay section and a method for setting a winding section;

FIG. 5 is a flowchart showing details of a method for detecting a response delay section.

FIG. 6 is a flowchart illustrating a cueing control method.

FIG. 7 is a flowchart showing a method of setting a speed command.

FIG. 8 is a timing chart when performing cueing control;

FIG. 9 is a diagram corresponding to FIG. 8 showing a conventional example.

[Explanation of symbols]

In the drawings, 1 is a magnetic tape (medium), 2 is a magnetic tape editing system, 3 is a personal computer (medium control device), 5 is a digital video camera (reproducing device), and 6 is a control circuit (control means).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/782 HF term (Reference) 5C018 AA00 AB01 AB03 AC08 DA01 DA05 DB03 DC04 FA02 FA03 FB02 5D077 AA08 BA03 BA04 CA02 CB15 CB17 DC04 EA08 EA23 FA03 FC02 5D104 AB11 AC05 AD14

Claims (2)

[Claims] 1. A control means for performing cueing control of the medium by stepwise switching two or more different speeds from a high speed to a low speed while intermittently detecting position information recorded on the medium. In the medium control device, the control unit detects a response delay section from a speed switching position to a speed switching position based on the position information, and performs the cueing control based on the response delay section. A medium control device, wherein a switching position is set. 2. The medium is played back by a playback device configured to be controllable by an external input. The control means sets the response delay section when the playback device is newly connected. 2. The medium control device according to claim 1, wherein the detection is performed.