JPS63102092A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain automatic retrieval of a tape count value by providing the titled device with a memory circuit for one field or one frame, a memory control circuit, a control duty discriminating circuit, a control pulse counter, and a control means for retrieving a tape. CONSTITUTION:A reproduced signal is amplified and returned to an original video signal by a reproducing circuit 5, the video signal is outputted to the memory circuit 9 and the control part 2 permits the memory control circuit 10 to store the video signal in the memory circuit 9 after the output of the video signal. Said operation is repeated several times and the contracted pictures of a large picture obtained at the time of reproducing a position recording a program searching signal are successively stored in a part of n-divided part of the memory circuit 9. In case of retrieving a tape position, a picture obtained from the memory circuit 9 and projected on a TV receiver 8, switch information of an operation part 1 and a current tape count value in the control part 2 are compared to decide whether retrieval is to be executed in the forward direction or the reverse direction and a command is outputted to a motor drive servo circuit 6. Thus, a tape position can be automatically retrieved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for recording a magnetic tape on a magnetic tape using a cue signal recorded on the magnetic tape, image information stored in a memory means, and a tape counter value at the time of detecting the cue signal. The present invention relates to a magnetic recording/reproducing device (hereinafter abbreviated as VTR) such as a video tape recorder that specifies the content being played and searches for the tape position.

BACKGROUND OF THE INVENTION In recent years, magnetic recording and reproducing devices have had to remember in advance whether or not a track has been recorded on a magnetic tape when searching for a tape position.

An example of the above-mentioned conventional magnetic recording/reproducing device will be described below with reference to the drawings.

FIG. 3 is a block diagram of a conventional magnetic recording/reproducing device.

1 is an operation section. Reference numeral 2 denotes a control section which inputs commands from the operation section 1 and information from the control duty discrimination circuit 3, outputs commands to each circuit, and controls the operation of the VTR. Reference numeral 3 denotes a control duty discrimination circuit which converts the duty, amplifies the recorded control pulse, discriminates the duty, and outputs address information to the control section 2. 4 is a control recording signal processing circuit which converts the control recording signal into a recording signal with a duty ratio changed according to the address information; o5 is a reproduction circuit which amplifies the signal reproduced from the head and returns it to the original video signal. Reference numeral 6 denotes a motor drive servo circuit that drives and controls the traveling mechanism section 7. 7
is a running mechanism section that runs the tape. 8 is a television (TV) receiver.

The operation of the conventional VTR configured as described above will be explained below.

1. First, use the operation unit 1 to set an address at the tape position that you want to detect at the time of recording start or particularly during playback, and press the input button. The control section 2 inputs button information from the operation section 1 and outputs address information to the control recording signal processing circuit 4.

The control recording signal processing circuit 4 records the control signal obtained by converting the duty of the control recording signal on the magnetic tape according to the address information from the control section 2. To leave recorded address information using other recording means. Next, during playback, address information for the next tape position to be detected is set using the operation unit 1 according to the current tape position and the address information left in the recording means, and the high-speed search button is pressed.

The control unit 2 inputs the address information set from the operation unit 1,
A command is output to the motor 57 and -7 motor drive servo circuit so that the traveling mechanism section 7 is in a high-speed traveling state. The control duty determining circuit 3 amplifies and shapes the waveform of the control signal even during high-speed running, determines the duty ratio, and outputs the address information to the control section 2 if address information is detected. Control unit 2
Then, the set address information is compared with the address information recorded on the magnetic tape, and if they are equal, a command is output to the motor drive servo circuit 6 and the reproducing circuit 5 so that the traveling mechanism section 7 enters the reproducing state. The traveling mechanism section 7 enters the regeneration state, and the motor drive servo circuit 6 follows the regeneration control signal.
Controls motors such as capstan motors and cylinder motors. The reproduction circuit 5 amplifies the signal reproduced from the head, returns it to the original video signal, and outputs it from the VTR. TV it
The tape position is searched by displaying the image on the receiver 8. If there is no other recording means, the magnetic tape is run at high speed from the beginning, and after detecting the position of the magnetic tape where the address information is recorded, it is played back for a few seconds and then run at high speed again. Repeat this operation until it ends at the tape position you want to search, and then move on to the next operation.

Problems to be Solved by the Invention However, with the above configuration, the address information must be recorded using other recording means, and the troublesome operation of setting the address is required, making it difficult for the user to use. This had the problem of placing a burden on the

In view of the above-mentioned problems, the present invention includes a memory means for one field or one frame installed in a VTR, so that a reduced picture of the part of the image where the cue signal is hit and the appropriate size is divided into n parts of the memory means. The information stored in the memory means is displayed on a TV receiver, and the control section stores the tape counter value at that time. n projected on the TV receiver
The present invention provides a VTR that uses the tape counter value to search one of the divided screens.

Means for Solving the Problems In order to solve the above-mentioned problems, the VTR of the present invention uses control recording, which records a cue signal by changing the duty ratio of the control signal at an arbitrary position on the magnetic tape. a signal processing means, a detection means for detecting the cue signal during high speed running, a memory means for storing one field or one frame of image information, a counter means for counting the control signal to obtain a tape count value, The tape count value obtained by the counter means when the cueing signal is detected during running is stored, the magnetic tape is played back after the cueing signal is detected, and the reduced image of the large screen at that time is stored in the memory means. n (where n is an integer of 2 or more) divided parts are stored, and the operation of running at high speed again is repeated to sequentially store reduced images of the large screen at the time of reproduction in the memory means each time the image is reproduced. and a control means for causing the memory means to perform the next cue using the tape count value after the storage is completed.

According to the above-described structure, the present invention inputs a cue signal at the tape position desired to be searched during playback during recording, and stores the tape count value and the reduced image of the reproduced image at the tape position where the cue signal is recorded during high-speed search. The reduced image at several locations is sequentially stored in n-divided parts of the memory means, and when performing a tape position search, the video signal of the reduced image stored in the memory means and the tape count value are used. By performing a high-speed search once, you can find the tape position to be searched without using any other recording means.
By obtaining the image information and tape count value, tape searches can be performed.

Embodiments Hereinafter, VTRs according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a VTR in an embodiment of the present invention. FIG. 2 is a display diagram of the TV screen. In FIG. 1, 1 is an operating section, 2 is a control section, 3 is a control duty discrimination circuit, 4 is a control recording signal processing circuit, 5 is a reproduction circuit, 6 is a motor drive servo circuit, 7 is a traveling mechanism section, 8 is a TV receiver aircraft, which is similar to the conventional example shown in FIG. 9 is A/I) (analog/digital) and D/A (digital/analog) 9
-7 This is a memory circuit that includes a converter and can record one field or one frame of image information. Reference numeral 10 denotes a memory control circuit that controls the memory circuit 9, such as where in the memory circuit 9 the image information is stored. 1
1 is the video signal output from the memory circuit 9 and the reproduction circuit 6
A playback signal switching switch is used to switch the video signal output from the playback signal. 12 is a counter that counts control pulses.

The operation of the VTR of this embodiment constructed as described above will be explained below with reference to FIG.

First, at the tape position where the tape position is desired to be detected at the start of recording or especially during playback, the user presses the cue signal input switch on the operation section 10. The control section 2 inputs switch information from the operation section 1 and outputs a cue signal write command to the control recording signal processing circuit 4. The control recording signal processing circuit 4 records a control recording signal with a different duty ratio on the magnetic tape according to the command.

The cue signal is recorded on the magnetic tape using the steps described above.

Next, during playback, press the high-speed search switch on the operation unit 1.

The counter 12 at that time is reset.

The control section 2 inputs the switch information from the operation section 1 and outputs a command to the memory control circuit 8 to make the TV screen a constant color in order to recognize the search mode. After completing the signal writing to the memory circuit 9, the playback signal changeover switch 1
1 to the memory circuit e side and outputs a command to the motor drive servo circuit 6 in order to put the traveling mechanism section 7 into a high speed traveling state. The traveling mechanism section 7 starts traveling at high speed in a sub-loading state. Even during high-speed driving, the control duty determination circuit 3 amplifies and shapes the reproduced control signal to determine the duty ratio, and when a cueing signal is detected, the control duty determination circuit 3 amplifies and shapes the reproduced control signal.
Outputs the presence or absence of a cue signal.

The control unit 2 inputs the presence or absence of a cueing signal, and if there is a cueing signal, it first stores the tape count value from the counter 9 at that time and controls the motor drive servo circuit 6 and the playback in order to put the traveling mechanism unit 7 into the playback state. A command is output to circuit 5. When the traveling mechanism is in the regeneration state, the regeneration signal changeover switch 11 is connected to the regeneration circuit 5 side, and the motor drive servo circuit 6 controls motors such as a capstan motor and a cylinder motor in accordance with the regeneration control signal. The reproduction circuit 5 amplifies the signal reproduced from the head, returns it to the original video signal, and outputs it to the memory circuit 9. After the video signal is output, the control unit 2 outputs a command to the memory control circuit 10 to store the video signal in the memory circuit 9. The memory control circuit 1Q controls the memory circuit 9 in accordance with a command from the control section 2 so that a reduced image of the large screen at the time of reproduction is stored in a portion of the memory circuit 9 divided into n parts.

It is stored in a part of the memory circuit 9 corresponding to the upper left part ADH,1VC of the TV screen in FIG. Memory circuit 9
After the writing is completed, the high speed running state is again set and the reproduction signal changeover switch 11 is connected to the memory circuit 9 side.

By repeating the above operation several times, the reduced images of the large screen at the time of reproduction at the position where the cue signal is recorded are sequentially stored in a portion of the memory circuit 9 divided into n parts. At the same time, the control section stores the tape count value from the counter 9 at that time. The control unit 2 detects whether the entire memory circuit 9 has stored or the entire magnetic tape has finished, and when detected, outputs a command to the motor drive servo circuit 6 to stop the magnetic tape, thereby stopping the magnetic tape. state. At this time, the reproduction signal changeover switch 11 is connected to the memory circuit e side, and the video signal from the memory circuit 9 is displayed on the TV receiver 8 as shown in FIG.

Next, when searching for a tape position, the switch corresponding to the ADH number for the next tape position search is pressed on the operation unit 1 based on the image displayed on the TV receiver 8 from the memory circuit 9. The switch information on the operation unit 1 is associated with the tape count value stored in the control unit 2, and the control unit 2 compares it with the current tape count value to determine whether to search in the forward direction or backward direction. A command is output to the motor drive servo circuit 6. The tape count value corresponding to the input person DR number and the tape count value input from the counter 12 1 3 f
, -> are equal to 1, the motor drive servo circuit 6 runs at high speed, and when they become equal, the magnetic tape is put into the playback state.
Outputs commands to. When the reproduction state is reached, the reproduction signal changeover switch 11 is switched, and the output signal from the VTR becomes the video signal output from the reproduction circuit 5, and is displayed on the TV receiver. If you want to search for the tape position again, stop the VTR, switch the playback signal changeover switch 11, send the video signal from the memory circuit 9 to the TV receiver 8, display the display as shown in Figure 2, and set the ADH number for the tape position search. Set it to run at high speed.

The above operations are performed to search for the tape position.

Effects of the Invention As described above, according to the present invention, there is provided a memory circuit for one field or one frame, a memory control circuit for controlling the memory circuit, a control duty determining circuit, a counter for counting control pulses, and a tape control circuit based on a tape count value. By providing a control means for performing a search, it is possible to know the contents recorded on the magnetic tape based on the images stored in one stage of the memory hand 141, and to automatically search the tape count value for the image. It is possible to obtain an excellent effect of not having to perform procedures such as address setting.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of an embodiment of the present invention, and FIG. 2 is a T
FIG. 3, which is a display pattern diagram for a V receiver, is a block diagram of a conventional example. 1...Operation unit, 2...Control unit, 3...
...Control duty discrimination circuit, 4...
... Control recording signal processing circuit, 5 ... Reproduction circuit, 6 ... Motor drive servo circuit, 7.
...Traveling mechanism section, 8...TV receiver, 9
...Memory circuit, 10...Memory control circuit, 11...Reproduction signal selection switch,
12...Counter, 13...TV receiver.

Claims (3)

[Claims] (1) A control recording signal processing means for recording a cue signal by changing the duty ratio of a control signal at an arbitrary position on the magnetic tape, a detection means for detecting the cue signal during high-speed running, and one field or one frame. a memory means for storing image information of , a counter means for counting control signals to obtain a tape count value, and storing a tape count value obtained by the counter means when the cueing signal is detected during high-speed running; An operation of reproducing the magnetic tape after detecting the cue signal, storing the reduced image of the large screen at that time in a portion of the memory means divided by n (where n is an integer of 2 or more), and running the tape again at high speed. control to repeatedly store reduced images of the large screen during playback in the memory means each time it is played back, and to cause the memory means to use the tape count value to cue the next cue after the storage is completed. 1. A magnetic recording and reproducing device comprising: means. (2) When dividing the screen into n parts and sequentially storing the reduced images of the reproduced images, specify the order of numbers 1 to n for each of the n divided small screens, and use that number when searching for the beginning. A magnetic recording and reproducing apparatus according to claim 1, characterized in that: (3) The magnetic recording and reproducing apparatus according to claim 1, wherein numerical characters are superimposed and stored on each of the n-divided small screens, and the cue is searched using the numerical characters.