JPH0352468A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To remove only the information of a character, etc., from an image to be displayed without erasing the information of the character recorded on a recording medium, etc., by providing a video tex information removal means which removes the information of the character, etc., from video information. CONSTITUTION:A recording means 14 extracts video tex information according to an insertion period signal, and inserts the video tex information to a video signal, and records it on a magnetic recording medium 13. Then, the video tex information is inserted to the video signal in either an even-numbered field or odd-numbered field recorded on the recording medium 13. Also, the video tex information removing means 1 and 30 remove the video tex information from the video signal to which the video tex information is inserted in such way and send it out to the outside the device. Accordingly, in the case of selecting video tex information removing means 1 and 30 sides with selection switches 9, 11, and 20, the video information without having the video tex information is displayed when the information sent from the video tex information removing means 1 and 30 is screen-displayed. Thereby, the information of a date, etc., are erased from a display picture without erasing the information of the date, etc., from the recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device equipped with a device for inserting information such as a date into a video.

[Prior art and its problems] Recording, for example, a date or a title over video information recorded on a magnetic tape can be done by so-called dubbing, but in order to prevent deterioration of image quality due to dubbing, 2. Description of the Related Art Video tape recorders (hereinafter referred to as VTRs) are known that directly record information such as a date on a magnetic tape while reproducing video information recorded on the magnetic tape.

When video information in which information such as the date has been inserted and recorded in this way is played back and displayed on the screen, only the date and other information will be displayed and the range of the video where the date and other information will be superimposed will be This method has the disadvantage that the image that was created is erased.

To solve this problem, even or odd fields of the video signal into which information such as the date is inserted in order to reduce the original image information that is erased for the range of the video on which the information such as the date is superimposed. A magnetic recording/reproducing device that inserts and records information such as a date on either one of the two has already been proposed by the present applicant.

However, when video information in which information such as the date has been inserted and recorded in this way is played back and displayed on the screen, it always becomes an image with information such as the date attached, and if you do not want the information such as the date to be displayed on the screen, the recording medium There was a problem in that the part where information such as the date was inserted had to be erased.

The present invention was made to solve these problems, and is a magnetic recording device that can erase information such as the date from the display screen without erasing the recorded information such as the date from the recording medium. The purpose is to provide a playback device.

[Means for Solving the Problems] The present invention includes a reproducing means for reproducing a video signal recorded on a magnetic recording medium, and a method for reproducing a predetermined character or figure in synchronization with the reproduced video signal reproduced by the reproducing means. Character and graphic information generation means for generating information, and a vertical synchronization signal of the reproduced video signal sent by the reproduction means is frequency-divided and the character and graphic information is inserted in synchronization with the reproduced video signal of either the even field or the odd field. an insertion period generation section that generates an insertion period signal in the form of a predetermined insertion period; a recording means for inserting into a video signal and recording it on a magnetic recording medium; and a character for removing character and graphic information from the video signal with character and graphic information recorded by the recording means and sent out from the reproduction means and transmitting it to the outside of the apparatus. The present invention is characterized by comprising a graphic information removing means and a selection switch for selecting whether the video signal with text and graphic information is sent to the outside of the apparatus or to the text and graphic information removing means.

[Operation] By configuring as above, the character/graphic information generation section is
The reproduction means generates character or graphic information to be inserted into the video signal in synchronization with the video signal. The insertion period generator divides the frequency of a vertical synchronization signal in the video signal sent by the reproduction means to generate a predetermined period in which text and graphic information is inserted in synchronization with either an even field or an odd field of the video signal. An insertion period signal is generated that shapes the insertion period of. The recording means extracts the text/graphic information according to the insertion period signal, inserts the text/graphic information into the video signal, and records it on the magnetic recording medium.

Therefore, character and graphic information is inserted into the video signal of either the even field or the odd field recorded on the magnetic recording medium. Further, the text/graphic information removing means removes the text/graphic information from the video signal into which the text/graphic information has been inserted and sends it to the outside of the apparatus. Therefore, when the text/graphic information removing means is selected in the selection switch, when the information sent from the text/graphic information removing means is displayed on the screen, video information without text/graphic information is displayed.

[Embodiment] In FIG. 1, which is an embodiment of the magnetic recording and reproducing apparatus of the present invention, 1 is a key switch for manually inputting character information such as a date to be inserted into a video signal recorded on a magnetic tape. Yes, the key switch I is, for example, as shown in FIG.
It is composed of a control key part 30 and a keyboard part 40.

The control key part 30 includes an insertion display on/off switch 3l for switching between the insert side for inserting text information into the video signal and the normal side for not inserting text information, and a character type switch for switching the type of text information for inserting date, time, or text. A switch 32, cursor keys 34a to 34d for moving the cursor up, down, left and right on the screen to determine the range in the video when inputting characters, and delete keys 34a to 34d for deleting, inserting, and retracting characters, respectively. It includes a key 35, an insert key 36, a backspace key 37, and an area key 38 that, together with a cursor key, determines the range within the video into which characters are to be inserted. Further, the keyboard section 40 is
It is provided with a keyboard 4l and a numeric keypad 42 for inputting alphanumeric characters, hiragana, and katakana.

The output side of such a key switch 1 is the cow-switch 1.
The output side of the microcomputer 2 is connected to a microcomputer 2 which sends out control signals for controlling the operation of each device based on the control signals supplied from the controller. It is connected to a character circuit 3 that generates a character signal capable of inserting characters, figures, etc. into a video in response to character information, and is also connected to a gate pulse generation circuit 5, which will be described later.

The output side of the character generation circuit 3 is connected to an adder 4 and an adder 6. The other input side of the adder 4 has an input signal in the reproduced video signal to compensate for the time difference between the horizontal synchronization signal in the video signal reproduced from the magnetic tape and the horizontal synchronization signal in the video signal recorded on the magnetic tape. IH from the horizontal synchronization signal of
A pulse delay circuit 7 for creating a pulse signal delayed by -1 μs, that is, 62.55 μS1 is connected, and the adder 4 sends out the character signal synchronized with this delayed horizontal synchronizing signal.

The output side of the adder 4 is connected to an FM modulation circuit 8 that performs FM modulation on the character signal, and the output side of the FM modulation circuit 8 is connected to a terminal 9a of a switch 9. Terminal 9b of switch 9 is grounded, and when Suinochi 9 is supplied with a gate pulse signal of I\i (H) level from gate pulse generating circuit 5, it outputs a gate pulse signal of low (L) level to terminal 9a side. When power is supplied, it switches to the terminal 9b side.

On the output side of the Suinochi 9, there is a recording amplifier 10 that amplifies the signal into which the character signal to be recorded on the magnetic tape 13 is inserted.
The output side of the switch 1l is connected to a magnetic tape 13 and a magnetic node 12 for recording and reproducing information. In addition, switch 1
The terminal 11b of the switch 11 is grounded, and the switch 11 operates in the same way as the switch 9 in accordance with the H level or L level gate pulse signal sent out by the gate pulse generating circuit 5.

That is, the switch 1l receives an H signal from the gate pulse generation circuit 5.
When a level gate pulse signal is supplied, the key terminal 1 1
When an L level gate pulse signal is supplied to the a side, it switches to the terminal 1lb side.

A switch 14 and a switch 24 are connected to the output side of the magnetic head 12. A terminal 24a of the switch 24 is grounded, a terminal 24b is connected to the outside of the device, and the switch 24 outputs an L-level gate pulse signal to the terminal 24a side when an H-level gate pulse signal is supplied from the gate pulse generation circuit 5. When is supplied, it switches to the terminal 24b side. The sui-nochi 14 is connected to the terminal 14a side when reproducing video signals from the magnetic tape l3, and to the terminal 14b (Iff) when recording video signals on the magnetic tape l3; FM demodulates the playback video signal via the playback amplifier 15 that amplifies the FM?!
! It is connected to the control circuit 16. On the other hand, a video signal terminal 17 to which a video signal is supplied from outside the apparatus is connected to an FM modulation circuit 18 that performs FM modulation on the supplied video signal so that it can be recorded on the magnetic tape 13, and an FM modulation circuit 18 that amplifies the FM modulated video signal. Terminal 1 of switch 14 via recording amplifier 19
4b.

The output side of the FM demodulation circuit l6 is connected to the adder 6, and also to a synchronization separation circuit 2l that separates a vertical synchronization signal and a horizontal synchronization signal from the reproduced video signal.

The output side of the synchronization separation circuit 21 is connected to an AFC circuit 22 that controls the phase of the output signal based on the horizontal synchronization signal.
The horizontal synchronization signal output terminal 22a of the C circuit 22 is connected to the character generation circuit 3, the pulse delay circuit 7, and the gate pulse generation circuit 5, and the vertical synchronization signal output terminal 22b of the AFC circuit 22 is connected to the character generation circuit 3, the gate pulse generation circuit 7, and the gate pulse generation circuit 5. It is connected to the pulse generation circuit 5 and the flip-flop circuit 23.

The flip-flop circuit 23 is a circuit that divides the supplied vertical synchronization signal and generates a field determination signal corresponding to either a so-called even field or an odd field, and the output side of the flip-flop circuit 23 is a gate pulse. It is connected to the generation circuit 5. Therefore, the gate pulse generation circuit 5 generates an H-level gate pulse signal in synchronization with the field determination signal supplied from the flip-flop circuit 23 when the video signal of either the even field or the odd field is being reproduced. is sent to switch 9, switch 11, and switch 24.

Therefore, switch 9, switch l1, and switch 24 are
When an H-level gate pulse signal is supplied from the gate pulse generation circuit 5, the terminals are switched to terminals 9a, 11a, and 24a, respectively, and when an L-level gate pulse signal is supplied from the gate Hauls generation circuit 5, the terminals are switched to terminals 9b, respectively. , terminal 1lb and terminal 24b.

On the other hand, the adder 6 connects the character signal sent out from the FM demodulation circuit 16 with the character signal sent out from the FM demodulation circuit 16 so that the degree of superimposition of the character signal and the video signal can be monitored before the character signal sent out from the character generation circuit 3 is recorded on the magnetic table l3. This circuit adds the reproduced video signal.

The output side of adder 6 is connected to the input side of switch 20. The terminal 20a of the suinochi 20 is an A/
It is connected to an image memory 26 that stores video information via a D conversion circuit 25, and the output side of the image memory 26 is connected to a D/A that converts the video information sent from the image memory 26 into analog.
It is connected to a video signal output terminal 29 via a conversion circuit 27. On the other hand, the terminal 20b of the switch 20 is directly connected to the video signal output terminal 29. Such a switch 20
The operator selects either the terminal 20a or the terminal 20b by operating a switch 70 that instructs whether or not information such as the date recorded along with the video information is to be displayed on the screen. When the switch 70 is in the on state, the contact of the switch 20 is switched to the terminal 2Oa side.

In addition, when storing video information in the image memory 26, on the manual side of the A/D conversion circuit 25, image memory 26, and D/A conversion circuit 270, the video information of the field in which information such as date is not inserted is stored. The output side of a memory control circuit 28, which sends out a control signal to store , is connected.

The operation of the magnetic recording and reproducing apparatus configured as described above will be explained below.

First, when recording a video signal on the magnetic tape 13, the operator selects the normal side of the insertion display on/off switch 3l of the key switch l, thereby switching the switch l4 to the terminal 14b side, which is the recording side terminal. Therefore, the video signal supplied from the video signal input terminal 17 is FM-modulated by the FM modulation circuit 18, amplified by the recording amplifier 19, and sent to the magnetic head l2 via the terminal 14b. It is recorded on magnetic tape l3.

Next, without inserting character information such as a date into the video signal recorded on the magnetic tape 13, the video signal is transferred to the magnetic tape 13.
3, the switch 14 is switched to the terminal 14a, which is the reproduction side terminal. Further, since character information such as a date is not inserted into the video signal recorded on the magnetic tape l3, the switch 70 may be in the off state.
Therefore, the contact of the switch 20 is connected to the terminal 2Ob side. Therefore, the reproduced video signal reproduced from the magnetic tape 13 by the magnetic head l2 is sent to the reproduction amplifier 15 via the terminal 14a, amplified by the reproduction amplifier l5, and then F
FM demodulated by M demodulation circuit 16, adder 6, terminal 20
The b1 video signal is sent to the outside of the device via the video signal output terminal 29.

Note that when recording and reproducing video signals in the above-mentioned normal mode, since the insert display on/off switch 3l of the key switch 1 is on the normal side, the microcomputer 2 sends a control signal to the gate pulse generation circuit 5 indicating that the mode is normal. Send out.

Therefore, the gate pulse generation circuit 5 sends, for example, an L level gate pulse signal to the switch 9, the switch 1l, and the switch 24, so that each switch is connected to the terminal 9b.
, terminal 1lb and terminal 24b, and no character signal is sent from the character generation circuit 3 to the magnetic head 12.

Next, when inserting character information such as the date into the video signal, the operator selects the insert side of the insertion display on/off switch 31 of the key switch 1, and the microcomputer 2 receives the information supplied from the key switch 1. Based on the character information etc., the length of the insertion period of the character information etc. to be inserted into the video signal is determined, and a corresponding control signal is sent to the gate pulse generation circuit 5. Further, the switch l4 is switched to the terminal 14a side which is the reproduction side terminal.

Therefore, the reproduced video signal reproduced from the magnetic tape 13 by the magnetic head 12 is subjected to signal processing and sent out from the FM demodulation circuit 16 in the same manner as in the normal mode described above.

The synchronization separation circuit 21 extracts a horizontal synchronization signal and a vertical synchronization signal from this reproduced video signal and sends them to the AFC circuit 22.
The AFC circuit 22 outputs phase-controlled horizontal synchronization signals and vertical synchronization signals to the character generation circuit 3 and the gate pulse generation circuit 5.
, pulse delay circuit 7 and flip flow knob circuit 23
Send to.

The character generation circuit 3 adds the above to the supplied horizontal synchronization signal and vertical synchronization signal so that character information such as the date manually input by the operator from the key switch 1 is inserted at the position desired by the operator in the video. A character signal is generated by synchronizing character information and the like, and this character signal is sent to an adder 4.

The adder 4 adds the horizontal synchronizing signal, which is the horizontal synchronizing signal sent out from the AFC circuit 22 and delayed by 62.55 μs in the pulse delay circuit 7, and the character signal.

The added signal is FM modulated by the FM modulation circuit 8 and sent to the terminal 9a of the switch 9.

The flip-flop circuit 23, as shown in FIG. 2b,
The frequency of the vertical synchronizing signal sent out by the AFC circuit 22 is divided, and the pulse signal 61 is sent to the gate pulse generating circuit 5 only when, for example, an even field video signal of l frame is being reproduced.
Send to. Therefore, as described above, the gate pulse generation circuit 5 is supplied with a control signal from the microcomputer 2 indicating a magnitude corresponding to the insertion period of character information, etc., and generates a gate pulse signal 62 having a magnitude corresponding to this control signal. AF
It is synchronized with the horizontal synchronizing signal and vertical synchronizing signal supplied from the C circuit 22, and is sent out as shown in FIG. 2C. Therefore, switch 9, SW. /chi 11 and switch 24
are switched to the terminals 9a, 11a, and 24a only when the above-described H-level gate pulse signal 62 is supplied from the gate pulse generation circuit 5. Therefore, when the gate pulse signal 62 at H level is sent out from the gate pulse generation circuit 5, that is, the part corresponding to the range where the operator wants to insert information such as the date into the image on the display screen is recorded on the magnetic tape. When the video signal is being reproduced, the signal 63 such as character information sent from the adder 4 is sent to the recording amplifier lO via the terminal 9a of the switch 9, as shown in FIG. 2d. Sent out. Therefore, the signal 63 such as character information supplied to the recording amplifier IO is as follows.
The signal is synchronized with the gate pulse signal 62 as shown in FIG. 2d. This signal 63 such as character information is amplified by the recording amplifier 10 and sent to the terminal 11a of the switch l1. Since the switch 1l and the switch 9 operate in the same way, the signal 63 such as character information sent from the recording amplifier 10 is sent to the magnetic head 12 via the terminal 11a of the switch 1l, and the signal 63 is sent to the magnetic head 12. magnetic tape 1
Recorded in 3. Therefore, character information 63 inputted by the operator at a desired position within the video signal 60 of each even field of each frame of the video signal recorded on the magnetic tape 13 is shown in FIG. 2e. The video signal 60 is inserted as shown in FIG.

Note that when the gate pulse signal of L level is supplied from the gate pulse generation circuit 5, the switch 9 and the switch 1■ are switched to the terminal 9b and terminal 1lb side, and the FM modulation circuit 8 and the magnetic head 12 are connected to each other. be separated. Since the switch 1l, which operates in the same way as the switch 9, is provided between the FM modulation circuit 8 and the magnetic head 12, crosstalk from the FM modulation circuit 8 side to the magnetic head 12 and F
Since the switch 11 is switched to the terminal ttb side while the L level gate pulse signal is being sent from the gate pulse generation circuit 5, the signal is sent from the magnetic head l2. It works to ensure the output of the reproduced signal.

In this way, as shown in FIG. 2e, the video signal 64 into which text information etc. are inserted can be, for example, only even fields, and no text information etc. are inserted into odd fields, and the video signal 64 is Therefore, when the video signal 65 in which the video signal 64 with text information etc. inserted and the video signal 60 with no text information etc. are alternately played back and displayed on the screen, the contents of the screen are In the area where text information, etc. is displayed, the phenomenon in which the image is completely erased and only text information is displayed is no longer present, and the text information, etc. and the image appear to overlap, as shown in Figure 4. can.

The recorded video signal 65 with character information etc. inserted in the above-described operation is immediately reproduced by the magnetic head 12, and the terminals 1 to 4 of the switch l4 are immediately reproduced by the magnetic head 12, as in the case of reproduction in the normal mode.
．． a, Reproduction amplifier 15, FM? The signal is sent out as a video signal from the video signal output terminal 29 via the ji tone circuit 16, the adder 6, and the terminal 20b of the switch 20.

At this time, since the gate pulse generation circuit 5 is sending out the gate pulse signal 62 at H level, the switch 24 is
is switched to the terminal 24a side and is in a grounded state. Therefore, in principle, the reproduced video signal inserted with the character information reproduced by the magnetic henode 12 should not be sent to the video signal output terminal 20 side, but the output voltage of the reproduced video signal is as high as 3Vp-p, Further, since the amplifier gain of the reproduction amplifier 15 is as large as 60 dB, the reproduced video signal leaks to the reproduction amplifier 15, and as a result, the reproduced video signal is also sent out from the video signal output terminal 29.

Furthermore, before using the key switch 1 to insert and record the character information set by the operator into the video on the magnetic tape, the apparatus is set to the normal playback mode, and the character information, etc. set by the operator is inserted into the video on the magnetic tape. can also be inserted by the adder 6, and the inserted reproduced video information with character information can be sent out from the video signal output terminal 29 and visually displayed on a cathode ray tube for monitoring. Incidentally, when inserting character information etc. into the video recorded on the magnetic table l3, as mentioned above, the adder 6 is turned off, and the FM modulation circuit l6 and the video signal output terminal 29 are
are connected via the terminal 20a of the switch 20, and the character information etc. sent out from the character generation circuit 3 are not added to the reproduced video information with character information sent out from the FM demodulation circuit 16, and the FM demodulation circuit The reproduced video information with character information sent from the 16 can be monitored on a cathode ray tube.

Next, if you want to normally play back the magnetic tape l3 on which text information has been recorded in the video information by the above-mentioned operation, and display only the video information without displaying the text information on the screen, perform the following operations. The person operates the suinochi 70 to turn it on. By turning on the switch 70, the Suinochi 20
The contact point is connected to the terminal 20a side, and the video information with text information sent from the magnetic head 12 is connected to the terminal 1 of the switch l4.
4a, reproduction amplifier l5, FMfLIl! A/D conversion circuit 25 via circuit l6 and terminal 20a of switch 20
supplied to Note that at this time, the adder 6 does not perform the addition operation as described above.

From the video information with text information supplied to the A/D conversion circuit 25, the video information recorded in the field where text information is recorded is removed by the control signal sent by the memory control circuit 28, and the text information is removed. Only the video information recorded in unrecorded fields is digitally converted by the A/D conversion circuit 25, and this video information is stored in the image memory 2.
6 is stored.

The image memory 26 reads out the same field of stored video information twice in succession according to a control signal supplied from the memory control circuit 28.

By operating in this manner, the video information in the field in which text information is inserted is replaced with the video information in the field in which text information is not inserted. Then, the video information read out from the image memory 26 is converted into analog by the D/A conversion circuit 27, and is converted to an analog signal at the video signal output terminal 2.
It is sent to 9.

By operating in this way, it is possible to obtain video information without text information rather than video information with text information, and therefore, when the video information sent from the video signal output terminal 29 is displayed on the screen, the text information is erased. The image will be Incidentally, if it is desired to display an image with text information on the screen, it is sufficient to turn off the switch 70, and according to the magnetic recording/reproducing apparatus of this embodiment, video information with text information and video information without text information can be displayed. can be easily obtained.

[Effects of the Invention] As described in detail above, according to the present invention, since the present invention includes a text/graphic information removing means for removing information such as text from video information into which information such as text is inserted, it is possible to Only information such as characters can be removed from a displayed image without erasing recorded information such as characters.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of an embodiment of the magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a time chart showing the operation of the magnetic recording/reproducing apparatus shown in FIG. 1, and FIG. 3 is the same as that shown in FIG. A plan view showing the configuration of the key inochi shown in FIG.
Figure 5 shows a screen display of a video with text information etc. inserted using the magnetic recording/playback device shown in Figure 5. Figure 5 shows a screen display of a video with text information etc. inserted using a conventional magnetic recording/playback device. This is a diagram. 1...Eleven switches, 3...Character generation circuit,
5... Gate pulse generation circuit, 9, 1l... Suinochi, 20... Switch, 23... Flip-flop circuit, 24... Switch, 26... Image memory, 2
8...Memory control circuit.

Claims (1)

[Claims] (1) A reproduction means for reproducing a video signal recorded on a magnetic recording medium, and a text/graphic information generating means for generating information of predetermined characters or figures in synchronization with the reproduced video signal reproduced by the reproduction means. , an insertion that divides the frequency of the vertical synchronization signal of the reproduced video signal sent by the reproduction means to form a predetermined insertion period in which character and graphic information is inserted in synchronization with the reproduced video signal of either an even field or an odd field; an insertion period generation section that generates a period signal; and inserting the character/figure information extracted in accordance with the insertion period signal sent from the insertion period generation section into a video signal recorded on a magnetic recording medium. a recording means for recording; a character and graphic information removing means for removing character and graphic information from a video signal with character and graphic information recorded by the recording means and sent out from the reproduction means and sending it to the outside of the apparatus; A magnetic recording/reproducing device comprising: a selection switch for selecting whether to send a video signal to the outside of the device or to the text/graphic information removing means.