JP3273566B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus, and more particularly to a recording / reproducing apparatus having a function of searching for a recording end portion on a tape-shaped recording medium.

[0002]

2. Description of the Related Art Conventionally, in a recording / reproducing apparatus such as a VTR, a function called an end search for automatically searching for the end of a recording area under the control of a system controller is known. This has been used when searching for the end of the last recorded portion, such as when recording is continued after the last recorded portion of the magnetic tape.

FIG. 4 is a diagram for explaining a procedure of an end search in a conventional VTR, and FIG. 5 is a flowchart for explaining a control operation thereof. 4A shows a magnetic tape on which a video signal has already been recorded, and FIGS. 4B and 4C show the relative position of the recording / reproducing head with respect to the magnetic tape.

Next, the operation of the conventional example will be described with reference to FIGS. In FIG. 4, when an end search is instructed, a system controller (not shown) determines whether the position of the recording / reproducing head on the magnetic tape is a portion where a video signal is recorded (hereinafter, referred to as an RF recording unit). 2
Perform the following control. First, when the current position is a portion B where no video signal is recorded (hereinafter, referred to as an RF unrecorded portion) B, as shown in FIG.
To the rewind mode (REW running mode).
When the rising edge of the reproduction RF signal is detected in the W running mode and the recording end portion b is detected, the STOP mode is set and the running of the magnetic tape is stopped to complete the end search.

[0005] Next, when the current position is the RF recording section A, as shown in FIG. 4C, the mode is changed from the current STOP position c to a fast-forward mode (FF running mode). When the trailing edge is detected and the recording end portion d is detected, the mode is set to the REW running mode. Thereafter, when the rising e of the reproduced RF signal in the REW running mode is detected, the STOP mode is set and the end search is completed.

Next, the operation of this conventional example will be briefly described with reference to the flowchart of FIG. In FIG. 5, the process is started, and it is determined in step 5a whether or not an RF unrecorded portion is present. ), And if it is EOT, the process proceeds to step 5e, where the mechanism STOP is performed and the process is terminated (end search is stopped).

If it is not EOT in step 5c, the flow advances to step 5d to determine whether the fall of the RF signal has been detected. If the fall has been detected, the flow advances to step 5f to start REW running. If it is determined in step 5a that the area is in the RF unrecorded area, the flow proceeds to step 5f to start REW running. And
In step 5g, determine whether the BOT (tape top)
If it is T, the process proceeds to step 5e, and if it is not BOT, the process proceeds to step 5h. In step 5h, it is determined whether the rising of the RF signal has been detected. If detected, the process proceeds to step 5i, where the mechanism is stopped, and the process ends (end search ends). If no RF rise is detected in step 5h, the process returns to step 5g.

[0008]

As described above, in the conventional example, since the fall of the reproduced RF signal is detected in the FF running mode, the connecting portion of the magnetic tape (see the RF unrecorded portion B in FIG. 2). Detects the gap between
There has been a problem that this gap is determined as the terminal end of the RF recording unit (see FIG. 2 RF recording unit A). If the subsequent recording is performed, the contents of the RF recording unit (see the recording unit C in FIG. 2) which has already been recorded are lost, which is not preferable.

Further, the reproduction R
In order to detect the rising edge of the F signal and to end the operation in the STOP mode therefor, it is not possible to search for the optimum recording end portion for the next continuous recording (searching before the actual recording end portion (BOT side)). Problem),
Although the operation is completed in the STOP mode in spite of the purpose of the splice recording from the end of the already recorded portion, the search position may be further shifted when the recording standby state is set again. There was a problem. Also,
When the recording standby state is set again, it has not been possible to confirm whether or not it is really the end of the desired recorded portion.

[0010] This invention has been made to solve the above problems, recorded portion end portion immediately before the position of the head
The camera can be stopped at the
And to provide a that recording and reproducing apparatus.

[0011]

In order to achieve the above object, according to the present invention, a recording / reproducing apparatus is configured as described in the following (1) to (3). (1) Tape transport means for transporting a tape-shaped recording medium in its longitudinal direction, a head for recording and reproducing a video information signal on the tape-shaped recording medium, and recording of a video information signal using the head Detection means for detecting non-recording, counting means for counting pulses according to the conveyance of the tape-shaped recording medium, and control means for controlling the operation state of the conveyance means and the counting means in accordance with the output of the detection means The control means reverses the recording of the tape-shaped recording medium in response to the detection of the non-recording of the video information signal by the detection means for a certain period or more during the conveyance in the same direction as the recording. In the opposite direction, and when the recording of the video information signal is detected during the transport in the reverse direction, the counting means is set to an initial value to start counting, and the counted value is set to a first predetermined value. value Then, the transport direction of the tape-shaped recording medium is switched to the same direction as during recording so that a video can be confirmed as a reproduction state , and the counting direction of the counting means is reversed, and the transport in the same direction as during recording is performed. count of said counting means does not reach the initial value in serial
At the start of recording, when the second predetermined value corresponding to the tape traveling amount necessary for continuous recording is reached, the transport of the tape-shaped recording medium is stopped, and control is performed so as to be in a recording standby state. Characteristic recording / reproducing device. (2) In the above (1), the first predetermined value is determined by confirming the recording of the video information signal as an image when the tape-shaped recording medium is reproduced by the tape transport means to a position corresponding to the initial value. A recording and playback device that is set to be able to. (3) In the above (2), the second predetermined value is such that the tape transport means reproduces the tape-shaped recording medium to a position corresponding to the initial value, and performs continuous recording from a position corresponding to the initial value. A recording / reproducing device set to be able to perform.

[0012]

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a video tape recorder (VTR) according to an embodiment of the present invention, FIG. 2 is a diagram for explaining a recording start possible position search procedure of the embodiment, and FIG. 3 is a system controller of the embodiment. 6 is a flowchart showing the operation of the first embodiment. FIG. 1 shows only a main part related to the search for a recordable position in the VTR.

In FIG. 1, A ₁ is a magnetic tape conveying means, which is constituted by a supply reel 4, a take-up reel 5, a pinch roller 8 and a capstan 9. B ₁ is a signal detecting means, which is constituted by an RF signal detecting unit 13, which detects a reproduced RF signal from the magnetic tape 3. C ₁ is a counting means.
It is provided inside. D ₁ is control means,
It comprises a system controller 16.

The mechanical unit 1 is set to a predetermined mode by a mechanism driving unit 2, and the magnetic tape 3 travels in accordance with the set mode. The magnetic tape 3 stored in a cassette (not shown) It is pulled out while being wound on the supply reel 4 and the take-up reel 5 and is in contact with the rotating head 7 on which the recording / reproducing heads 6a and 6b are arranged on a circumference forming a predetermined angle.

The mechanical unit 1 is operated in a REW running mode,
When a predetermined mode such as the FF running mode or the normal reproduction mode is set, the magnetic tape 3 is caused to run in the forward and reverse directions by the rotation of the pinch roller 8, the capstan 9, the supply reel 4 and the take-up reel 5, Magnetic tape 3
Are read by the heads 6a and 6b. 10a is a magnetic tape tape top (BO
T) and 10b are sensors for detecting the tape end (EOT) of the magnetic tape, respectively, and a transparent leader tape attached to the end of the magnetic tape by an infrared diode and a phototransistor (both not shown). A magnetic part is optically detected. Note that the detection signal is input to the system controller 16.

The reproducing amplifier 11 includes the heads 6a, 6b
(RF signal) is amplified to an appropriate level and input to the signal processing unit 12 and the RF signal detection unit 13. The RF signal detector 13 outputs a predetermined detection signal to the system controller 16 while the RF signal is being detected from the output of the reproduction amplifier 11. The capstan FG sensor 14 detects the rotation of the capstan, and outputs the output to an FG amplifier 15.
The FG amplifier 15 amplifies the sensor output to an appropriate level and outputs it to the system controller 16 as a predetermined pulse (FG pulse).

The system controller 16 outputs a control signal for designating the mode of the mechanical unit 1 to the mechanism driving unit 2, and transitions the mechanical unit 1 to a predetermined mode to search for a recordable position as described later. An operation unit 17 as an input means for performing an operation and for giving an operation instruction, and a display unit 18 for displaying a state of a device are connected to the system controller 16.

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 2, (a) shows a magnetic tape in which an RF recording portion continuous from the beginning of the tape and an RF recording portion separated by a small RF unrecorded portion (for example, a tape joining portion) are formed. The parentheses indicate changes in the contact position of the reproducing head 6 with the magnetic tape 3. When a search for a recordable position is instructed from the operation unit 17, the system controller 16 outputs a control signal to the mechanism driving unit 2, sets the mechanical unit 1 to the FF traveling mode, and rapidly drives the magnetic tape 3 from the current position. Let it.

In the FF running mode, the system controller 16 monitors the output of the RF signal detecting section 13 and, when an RF unrecorded section is detected, starts a time counter inside the system controller 16 and counts a certain time. If the RF recording section is detected within that time, the time counter is stopped, the count value is reset, and R
F unrecorded portion b ₁ starts the count if it is detected. When a certain period of time can be counted (a certain continuous RF unrecorded portion is detected) in this way, a control signal is output to the mechanism driving unit 2 to set the mechanical unit 1 to the REW running mode, and the magnetic tape Run 3 in the opposite direction. In the FF running mode, before a certain continuous RF unrecorded portion is detected, the tape end (EO
When T) is detected, the mechanical unit 1 is set to a predetermined mode, and the search for a recordable position is stopped.

When the system is set to the REW running mode by detecting a certain continuous RF unrecorded portion, the system controller 16 monitors the output of the RF signal detecting unit 13 during the rewinding operation, and When the rising of the reproduction RF signal, that is, the end of recording is detected by the change in the signal, the F in the system controller 16
At the same time as setting the initial value in the G counter, counting of the FG pulse is started. Then, in this REW running mode, the FG pulse is counted (counted down).
When the value of the FG counter reaches the first predetermined value, a control signal is output to the mechanism driving section 2 to set the mechanical section 1 to the normal reproduction mode. The first predetermined value is set corresponding to a time (usually 1 to 2 seconds) during which the operator can reliably recognize the end of the recorded portion in the reproduction mode as a video.

The system controller 16 monitors the output of the FG amplifier 15 during the normal reproduction operation, and the FG counter continues to count (count up) FG pulses. When the count value of the FG counter reaches the second predetermined value, a control signal is output to the mechanism driving unit 2 to set the mechanical unit 1 in a recording standby state, and the recording end unit search operation ends. The second predetermined value is:
A value obtained by subtracting a value set in accordance with a tape traveling amount for obtaining an optimum position in performing the splicing recording from the initial value is a value obtained by subtracting the value. The value is calculated by subtracting the value.

When the search for the recording end portion is completed in this manner, the end portion of the RF recording portion C is moved to the position of the head without detecting the end portion of the RF recording portion A which is divided and recorded on the magnetic tape. And if you make a connection record further,
A signal is recorded following the RF recording unit C.

In the VTR of the above-described embodiment,
Since the vicinity of the recording end is reproduced after the detection of the recording end, it is possible to immediately determine whether the detected end is the desired end recognized by the operator.

Further, in the VTR of the above embodiment,
Since the recording standby mode is set after the end of the recording is detected, it is possible to smoothly shift to the next recording (photographing).

Note that the recording start possible position search instruction from the operation unit 17 in the above embodiment is not necessarily a direct instruction. For example, this operation may be performed in conjunction with turning on the power switch of the apparatus. Alternatively, instructions may be given by an external peripheral device such as a personal computer, an editing machine, and a remote controller. Further, the capstan F in the above embodiment is used.
The count of G may be a count of a tape counter or a time count after confirming a normal reproduction mode.
In the above embodiment, the video tape recorder is taken as an example, but this can be replaced with various other magnetic tape recording / reproducing devices.

Next, the operation control of this embodiment will be described with reference to FIG.
This will be described with reference to the flowchart of FIG. In FIG. 3, after starting, FF running is started in step 3a, it is determined whether or not EOT (tape end) is in step 3b. If it is not EOT, the process proceeds to step 3c. In step 3c, the presence or absence of an RF signal is determined. If there is no signal, a time count value is set in step 3d. If there is a signal in step 3c, the process returns to step 3b. Go from step 3d to step 3e
If it is EOT, the process is terminated. If it is not EOT, the process proceeds to step 3f to determine whether there is an RF signal. If not, the time counter is decremented by one in step 3g. If there is an RF signal in step 3f, the process returns to step 3b. The process proceeds from step 3g to step 3h, and determines whether the time counter is zero. If the time counter is zero, the process proceeds to step 3i. If not, the process returns to step 3e. In step 3i, REW running is started. Then, the process proceeds to step 3j, where it is determined whether the rising of the RF signal has been detected.
The k counter initializes the FG counter and starts counting FG pulses. Then, when it is determined in step 31 that the count value of the FG counter has reached the first predetermined value, the normal reproduction mode is set in step 3m. Then start. Then, if it is determined that the count value of the FG counter in Step 3 n becomes the second predetermined value, the process proceeds to step 3p, ends by setting the recording standby state (the recording termination search end). Step 3j,
If each of Steps 3l and 3n is No, the same steps are repeated until the result becomes Yes.

[0028]

As described above , according to the present invention,
If the head is stopped just before the end of the recorded part,
Nag shots can be taken reliably.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a video tape recorder according to an embodiment of the present invention.

FIG. 2 is a view for explaining a recording startable position search operation of this embodiment.

FIG. 3 is a flowchart showing the operation of the system controller according to the embodiment;

FIG. 4 is a diagram illustrating an end search operation of a conventional example.

FIG. 5 is a flowchart showing the operation of the conventional example.

[Explanation of symbols]

A ₁ conveying means B ₁ detecting means C ₁ counting means D ₁ control means 1 mechanical unit 2 mechanism driving unit 3 magnetic tape 4 supply reel 5 take-up reel 6 magnetic head 7 magnetic drum 8 pinch roller 9 capstan 11 reproduction amplifier 12 signal Processing unit 13 RF signal detection unit 14 FG sensor 15 FG amplifier 16 System controller 17 Operation unit In the drawings, the same reference numerals indicate the same or corresponding parts.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-169950 (JP, A) JP-A-2-193349 (JP, A) JP-A-1-23862 (JP, B2) (58) Survey Field (Int.Cl. ⁷ , DB name) G11B 15/02

Claims (3)

(57) [Claims] 1. A tape transport means for transporting a tape-shaped recording medium in a longitudinal direction thereof, a head for recording and reproducing a video information signal on and from the tape-shaped recording medium, and a video information signal using the head. Detecting means for detecting recording / non-recording of the recording medium; counting means for counting pulses according to the conveyance of the tape-shaped recording medium; and control for controlling operation states of the conveying means and the counting means according to the output of the detecting means. Means for controlling the recording of the tape-shaped recording medium in response to the fact that the non-recording of the video information signal by the detecting means is detected for a certain period or more during the conveyance in the same direction as the recording. Is transported in the reverse direction, and when the recording of the video information signal is detected during the transport in the reverse direction, the counting means is set to an initial value and counting is started, and the counted value becomes The transport direction of the tape-shaped recording medium upon reaching a predetermined value by switching to the recording time of the same direction as the reproduction state of
In this case, the image can be checked, and the counting direction of the counting means is reversed so that the count value of the counting means does not reach the initial value during the conveyance in the same direction as the recording.
A recording / reproducing apparatus for controlling the transport of the tape-shaped recording medium to be stopped and to be in a recording standby state when the second predetermined value corresponding to the tape traveling amount necessary for continuous recording is sometimes obtained. . 2. The recording apparatus according to claim 1, wherein the first predetermined value is obtained by recording the video information signal as an image when the tape transporting means reproduces the tape-shaped recording medium to a position corresponding to the initial value. A recording / reproducing apparatus, which is set so as to be checked. 3. The recording medium according to claim 2, wherein the second predetermined value is such that the tape transport means reproduces the tape-shaped recording medium to a position corresponding to the initial value, and performs continuous recording from a position corresponding to the initial value. A recording / reproducing apparatus characterized by being set so as to perform