JPH02288682A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To avoid a video signal at a period when character graph information is inserted from being entirely erased by inserting the character graph information to either video signal of an even number field or an odd number field recorded on a magnetic recording medium. CONSTITUTION:For example, a video signal 64 with character information or the like inserted thereto is only that of an even number field and no signal such as character information is inserted for an odd number field but only the video signal is inserted. That is, a video signal 65 in which the video signal 64 with the character information inserted thereto and a video signal 60 with no character information or the like inserted thereto exist alternately is reproduced and displayed on the screen. Thus, an event such that the picture is completely erased and only the character information is displayed in the range with the character information or the like on the screen displayed is avoided and the character information or the like and the picture are observed as if they were overlapped substantially as shown in figure.

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 the 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 information such as the date will be displayed in the area of the video where the information such as the date is superimposed, as shown in Figure 6. There was a problem in that the originally recorded image would be erased.

The present invention has been made to solve these problems, and provides a magnetic recording and reproducing device that can reduce the amount of original image information that is erased in the range of the video on which information such as the date is superimposed. The purpose is to

[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 unit that generates an insertion period signal forming a predetermined insertion period to be inserted; and the character/figure information extracted in accordance with the insertion period signal sent from the insertion period generation unit is recorded on a magnetic recording medium. The present invention is characterized by comprising a recording means that is inserted into a video signal and recorded on a magnetic recording medium.

[Operation] By configuring as above, the character/graphic information generation section can:
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. generates an insertion period signal forming an 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, the character/graphic information is inserted into the video signal of either the even field or the odd field recorded on the magnetic recording medium, and the video signal during the period in which the character/graphic information is inserted is not entirely erased.

[Embodiment] In FIG. 1, which is an embodiment of the magnetic recording and reproducing apparatus of the present invention, l is a key switch for inputting character information such as a date to be inserted into a video signal recorded on a magnetic tape. Yes, the key switch 1 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 31 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 when inputting characters, and the range within the video where characters are input, and delete keys for deleting, inserting, and backing up 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 41 for inputting alphanumeric characters, hiragana, and katakana, and a numeric keypad 42.

The output side of such a key switch 1 is a key switch l.
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 .mu.s, that is, 62.55 .mu.s, is connected, and the adder 4 generates 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. The terminal 9b of the switch 9 is grounded, and when the switch 9 is supplied with a high ([]) level gate pulse signal from the gate pulse generation circuit 5, the switch 9 outputs a low (L) level gate pulse signal qh< When supplied, it switches to the terminal 9b side.

The output side of the switch 9 is a recording amplifier IO 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 11 is connected to a magnetic tape 13 and a magnetic head 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 I (level or L level) gate pulse signal sent by the gate pulse generation circuit 5.

That is, the switch 11 receives an H signal from the gate pulse generation circuit 5.
When the gate pulse signal of the level is supplied, the terminal 11a
When an L-level gate pulse signal is supplied to the terminal 11b side, the terminal 11b side is switched to the terminal 11b 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 an H-level gate pulse signal is supplied from the gate pulse generation circuit 5. When an L level gate pulse signal is supplied to the terminal 24a side, it switches to the terminal 24b side. The switch 14 is
When reproducing video signals from magnetic tape 13, terminal 1
When recording a video signal on the magnetic tape 13, the terminal 4a is switched to the terminal 14b side. connected to. On the other hand, a video signal input 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. The signal is connected to the terminal 14b of the switch 14 via the recording amplifier 19.

The output side of the FM demodulation circuit 16 is connected to a video signal output terminal 20 via an adder 6, and a synchronization separation circuit 2 that separates a vertical synchronization signal and a horizontal synchronization signal from the reproduced video signal.
Connected to 1. Note that the adder 6 is connected to the character signal and the FM demodulation circuit 16 in order to monitor the degree of superimposition of the character signal and the video signal before recording the character signal sent from the character generation circuit 3 onto the magnetic tape 13.
This is a circuit that adds the reproduced video signal sent from the

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 dayless 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 11 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 pulse generation circuit 5, the terminals are switched to terminals 9b, 9b, and 24a, respectively. The terminal is switched to the terminal 11b and the terminal 24b.

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 7-mark side of the insertion display on/off switch 31 of the key switch l, and the switch 14 is switched 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 amplifier 19, and sent to the magnetic head 12 via the terminal +4b. and recorded on the magnetic tape 13.

Next, the video signal recorded on the magnetic tape 13 is transferred to the magnetic tape 13 without inserting character information such as the date.
3, the switch 14 is switched to the terminal 14a, which is the reproduction side terminal. Therefore, the reproduced video signal reproduced from the magnetic tape 13 by the magnetic head 12 is sent to the reproduction amplifier 15 via the terminal 14a, amplified by the reproduction amplifier 15, and then transmitted to the FM demodulation circuit 16 by the FM demodulation circuit 16.
The M signal is demodulated and sent to the outside of the device via the adder 6 and the video signal output terminal 20.

Furthermore, when recording and reproducing video signals in the above-mentioned normal mode, since the insertion display on/off switch 31 of the key switch 1 is on the 7-mark side, the microcomputer 2 sends an information to the gate pulse generation circuit 5 indicating that it is in the normal mode. Send control signals.

Therefore, the gate pulse generation circuit 5 sends, for example, an L level gate pulse signal to the switch 9, switch 11, and switch 24, so that each switch is connected to the terminal 9b.
, terminal 11b and terminal 24b, 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 l, and the microcomputer 2 receives the information supplied from the key switch l. 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 14 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-flop 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 inputted by the operator via 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 sent 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.
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 indicating the magnitude t according to the insertion period of character information etc. from the microcomputer 2, and generates a gate pulse signal having a magnitude corresponding to this control signal. 62 to A
It is synchronized with the horizontal synchronizing signal and vertical synchronizing signal supplied from the FC circuit 22, and is sent out as shown in FIG. 2C. Therefore, switch 9, switch 11 and switch 24
are switched to terminal 9a, terminal 11a, and terminal 24a only when the above-described H-level gate pulse signal 62 is supplied from gate pulse generation circuit 5. Therefore, when the gate pulse signal 62 of the Jl 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 magnetically When the video signal recorded on the tape is being reproduced, the signal 63 such as character information sent from the adder 4 is sent to the recording terminal via the terminal 9a of the switch 9 as shown in FIG. 2d. The signal is sent to the amplifier 10. Therefore, the signal 63 such as character information supplied to the recording amplifier 10 is synchronized with the gate pulse signal 62 as shown in FIG. 2d. And the signal 63 of this character information etc.
is amplified by the recording amplifier lO, and the terminal 1 of the switch 11 is
1a. Since the switch 11 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 11, and the signal 63 is sent to the magnetic head 12 by the magnetic head 12. It is sent to tape 13. 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 into the magnetic tape 13 and recorded on the magnetic tape 13 along with the video signal 60.

When the gate pulse signal of L level is supplied from the gate pulse generation circuit 5, the switch 9 and the switch 11 are switched to the terminal 9b and terminal 11b side, and the FM modulation circuit 8 and the magnetic head 12 are separated. Since the switch 11, 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 FM
Leakage is suppressed, and since the switch 11 is switched to the terminal 11b side while the gate pulse signal of L level is being sent out from the gate pulse generation circuit 5, the output of the reproduced signal sent out from the magnetic head 12 is reduced. It is working to ensure security.

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 5. 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 terminal 14a of the switch 14 is immediately reproduced by the magnetic head 12, as in the case of reproduction in the normal mode.
1 reproduction amplifier 15, FM demodulation circuit 16, and adder 6, the signal is sent out as a video signal from a video signal output terminal 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 into which the character information reproduced by the magnetic head 12 is inserted should not be sent to the video signal output terminal 20, 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 20.

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. It is also possible to insert the reproduced video information with character information by the adder 6 and send out the inserted reproduced video information with character information from the video signal output terminal 20 to visually display it on a cathode ray tube for monitoring. Incidentally, when inserting character information or the like into the video recorded on the magnetic tape 13, the adder 6 is turned off as described above, and the FM modulation circuit 16 and the video signal output terminal 20 are turned off.
The character information etc. sent from the character generation circuit 3 are not added to the reproduced video information with character information sent from the FM demodulation circuit 16, and the FM demodulation circuit 1
The reproduced video information with character information sent from 6 can be monitored on a cathode ray tube.

Further, in the above embodiment, text information is inserted into the video recorded on the magnetic tape 13, but image information may also be inserted.

As shown in FIG. 4, in the image information output device, for example, the output side of a video camera 51 that photographs image information to be inserted into an image recorded on a magnetic tape is an A/D converter that converts an analog signal into a digital signal. It is connected to a readable and writable memory (hereinafter referred to as RAM) 53 via a device 52 . The output side of the RAM 53 is connected to an image information output terminal 56 via a D/A converter 54 that converts a digital signal into an analog signal.
connected to the input side of the Note that the output side of the memory controller 55 to which the horizontal synchronization signal and vertical synchronization signal sent out by the synchronization separation circuit 21 shown in FIG. 1 are supplied is an A/D converter 52. It is connected to the RAM 53 and the D/A converter PAn 54, respectively.

By using such an image information output device, image information captured by the video camera 51 can be digitally converted,
It is stored in RAM53. The image information stored in the RAM 53 is read out in synchronization with the vertical synchronization signal and the vertical synchronization signal by a control signal sent from the memory controller 55, and is sent to the adder shown in FIG. 1 via the image information output terminal 56. It is sent to the input side of 4. After the signal is supplied to the adder 4, the image information photographed by the video camera 5I is inserted and recorded into the video recorded on the magnetic tape 13 in the same manner as in the embodiment described above.

In this way, image information is inserted and recorded instead of text information, so the operator can easily insert titles and various images into video recorded on magnetic tape without having to perform cumbersome operations such as operating a keyboard. Can be recorded.

[Effects of the Invention] As described in detail above, according to the present invention, character and graphic information inserted into a video signal can be inserted into either the even field or the odd field of the video signal. When the video signal with the information inserted is displayed on the screen, it is possible to reduce the amount of original image information that is deleted in the range of the video on which information such as the date is superimposed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration 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 of the present invention, and FIG. 3 is the key switch shown in FIG. 1. FIG. 4 is a plan view showing the configuration of the magnetic recording/reproducing apparatus of the present invention, FIG. FIG. 6 is a diagram showing a screen display of a video with text information etc. inserted using a conventional magnetic recording/reproducing device. Fig. 4 1...Key switch, 3...Character generation circuit,
5... Gate pulse generation circuit, 9, 11... Switch, 23... Flip-flop circuit, 24... Switch. Patent applicant Rico Co., Ltd. −

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 magnetic recording and reproducing device comprising: a recording means for recording.