JPH09200683A - Character multiplex broadcast recording / playback device - Google Patents

Abstract

(57) [Abstract] [Problem] The user records not only information such as characters and figures but also control information of a reproduction signal processing circuit by a character multiplex broadcasting system, and the signal processing circuit is optimized or cueed at the time of reproduction. To facilitate the retrieval of recorded contents by linking with signals. SOLUTION: Control parameter data of a reproduction signal processing circuit such as a parameter of noise reduction is converted into a character multiplex broadcast signal format by a character encoder 5 as character information of the character multiplex broadcast. The encoded signal is multiplexed by the multiplexing circuit 4 during a predetermined period of the recording luminance signal. The multiplexed signal is modulated into a signal format and recorded in the magnetic hoop 9. By controlling the playback video processing circuit using the recorded control parameter data during playback, it is possible to set playback video processing parameters suitable for the picture and obtain the effect intended by the person who is recording. Become.

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 incorporating a character multiplex broadcasting encoder for converting information such as characters / graphics into a digital signal and then multiplexing and transmitting it in a vertical blanking period of a television broadcasting signal. Regarding

More specifically, a recording / reproducing apparatus capable of recording / reproducing a reproduction signal processing parameter as character information and utilizing it for optimizing reproduction signal processing, or retrieving recorded contents by interlocking character information and a cue signal. Regarding

[0003]

2. Description of the Related Art In Japan, character multiplex broadcasting was started in 1985. The character multiplex broadcasting is a broadcasting in which information such as characters and figures is converted into a digital signal and carried in an unused area of the electric wave of the television broadcasting, and the character news or the like is broadcast on the television screen.

FIG. 9 shows an example of a character multiplex broadcast signal waveform.
This shows a character multiplex signal waveform for one horizontal scan. letter·
Information such as figures is converted to a digital signal (NR of carrier frequency 364 fH (fH: horizontal scanning frequency) = 5.727272 MHz (NR
Z format), and 296 in the effective scanning period of one horizontal scanning.
Superimpose bit data. This is done for each field by 4th of the 13th, 14th, 15th, 21st of the blanking period.
Transmission with one horizontal scan line.

In order to record a character broadcast signal on which a character multiplex signal is superimposed by a home VTR such as the S-VHS system, it is possible to stop Y / C separation in the character signal multiplex section at the time of recording. No. 30388, "Comb filter circuit", and Japanese Patent Laid-Open No. 1-51788, "Magnetic tape recording / reproducing apparatus". Since the Y / C separation is to separate the luminance signal Y and the color signal C by utilizing the correlation of the video signals, the waveform information of the uncorrelated character information is distorted due to the Y / C separation processing. Character information is destroyed. Y / of the character information part
By stopping C separation and processing as a luminance signal, S
-Household VT with wide band of luminance signal such as VHS system
With R, it is possible to record and reproduce teletext signals.

Further, Japanese Patent Application Laid-Open No. 2-140081 proposes a technique in which a character information signal adding circuit is provided in a luminance signal transmission line to record a date and an explanation (character) in a character multiplex broadcast signal format.

However, in the contents described in each of the above-mentioned publications, the character multiplex broadcasting broadcast from the television broadcasting station is simply recorded on the home VTR, or the date and the explanation (character) are recorded. However, a user of a home VTR has been unable to record information such as characters and graphics in a character multiplex broadcasting format and utilize the information during reproduction.

[0008]

As described above, in the character multiplex broadcasting, information such as characters and figures is digitized and multiplexed on four horizontal scanning lines in the vertical blanking period for transmission, and character news or the like is displayed on the television screen. Although it is a broadcast, the user records information such as characters and figures in a character multiplex broadcast format,
There is no recording / playback device that can utilize this during playback.

According to the present invention, the user records not only information such as characters and figures but also control information of the reproduction signal processing circuit by the character multiplex broadcasting system, and optimizes the signal processing circuit at the time of reproduction, (EN) Provided is a recording / reproducing apparatus which can be linked to facilitate retrieval of recorded contents, that is, a recording / reproducing apparatus which allows a user to utilize a character multiplex area.

[0010]

In order to solve the above-mentioned problems, a character multiplex broadcasting recording / reproducing apparatus of the present invention character-multiplexes control parameter data of a reproduction signal processing circuit such as parameters for motion detection and noise reduction. A character multiplex encoding means for encoding as a character multiplex broadcast signal format as character information for broadcasting, a multiplexing means for multiplexing the signal encoded by the encoding means for a predetermined period of a recording luminance signal, and a multiplex by the multiplexing means. And a recording processing circuit that modulates the signal into a signal format for recording and records the signal on a recording medium.

Also, during a predetermined period of the vertical blanking period of the video signal, the control parameter of the reproduction signal processing circuit modulates the signal multiplexed in the teletext signal format and reproduces it from the recording medium on which it is recorded. A reproduction video processing circuit for demodulating to the original video signal, a decoding means for decoding character multiplex broadcasting signal format encoded data multiplexed in the output video signal of the reproduction video processing circuit, and control from the data decoded by the means It is characterized by comprising a decoding means for decoding a parameter and a control means for controlling the reproduction signal processing circuit by the parameter.

As described above, the control parameters of the reproduction signal processing circuit such as the noise reduction parameter and the filter coefficient are recorded as a character signal, and the reproduction video processing circuit is controlled by using this during reproduction, which is suitable for the picture. It is possible to set the reproduction video processing parameter and obtain the effect intended by the person who records the image during reproduction.

Further, an encoding means for encoding characters or data into a character multiplex broadcasting signal format, a multiplexing means for multiplexing the signal encoded by the encoding means for a predetermined period of a recording luminance signal, and the multiplexing means. A recording processing circuit that modulates and records the multiplexed signal in a signal format to be recorded on a recording medium, and a signal for cueing when new character information is encoded and recorded by the encoding means. And a means for recording.

Furthermore, a first search means for searching a prerecorded signal for cueing and a character multiplex broadcast signal format prerecorded in the portion searched by the search means are encoded. The decoding means for decoding the character or data information, the second searching means for searching the next cueing signal after the decoding by the decoding means, and the decoding means for displaying a plurality of decoded character or data information. It is characterized by comprising a display means for displaying a plurality of images on one display screen.

Thus, when a plurality of programs are recorded on one recording medium, program information such as the title of the program is recorded as a character signal at the beginning of the program, and a cue signal is recorded in conjunction with it. At the time of reproduction, it is possible to check the contents of the tape by searching for the cue signal, decoding the character information of that portion, and displaying it on the screen. When a plurality of programs are recorded, when the title of one program is decoded, the next title is searched, and a list of recorded programs can be displayed by reducing the plurality of title screens and displaying them on one screen.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit configuration diagram for explaining a first embodiment of the present invention, and the operation will be described together with the configuration of this embodiment with reference to this figure.

First, recording will be described. Video input I
The composite video signal input to N is input to the sync separation / timing generation circuit 1 and the Y / C separation circuit 2, respectively. The sync separation / timing generation circuit 1 separates a vertical sync signal and a horizontal sync signal from the composite video signal, and based on the separated sync signal, a timing signal TS for indicating the position where the character signal is multiplexed. Occur. The Y / C separation circuit 2 separates the luminance signal Y and the color signal C from the input composite video signal, and inputs the luminance signal Y to the multiplexing circuit 4 and the color signal C to the low frequency conversion circuit 3, respectively. The low frequency conversion circuit 3 frequency-converts the separated color signal C into a low frequency (carrier frequency 629 kHz in the VHS method). The character encoder 5 inputs the control data of a reproduction signal processing circuit, which will be described later, as a character signal shown in FIG. 2 and encodes it into a digital code of a character multiplex broadcasting format.

The multiplexing circuit 4 is based on the timing signal TS of the sync separation / timing generation circuit 1, and is the thirteenth, fourteenth, and first vertical blanking periods of the separated luminance signal Y.
Encoded character data is multiplexed in a predetermined period of 5,21 lines. This multiplexed signal is the FM modulation circuit 6
Frequency modulation using. In the adder 7, the FM modulated multiplexed signal and the low frequency conversion color signal are added, and the magnetic head 8
Is recorded on the magnetic tape 9.

Next, the reproduction signal processing circuit will be described. FM to be recorded on the magnetic tape 9 by the magnetic head 10.
The addition signal of the modulation-multiplexed signal and the low-frequency conversion color signal is read out, and the FM modulation-multiplexed signal and the low-frequency conversion color signal are separated using the filter circuit 11. The FM demodulation circuit 12 is
The M modulation multiplexed signal is FM demodulated, and the high frequency conversion circuit 13 returns the low frequency conversion color signal to a carrier color signal (carrier frequency 3.58 MHz in the case of the NTSC system). The demodulated multiplexed signal (luminance signal) is input to the character decoder 15 and the YNR (luminance noise reduction) circuit 17, respectively.
The color signal is input to a CNR (color noise reduction) circuit 18. The character decoder 15 decodes the character information of the multiplexed signal to reproduce the character information of FIG.

In the control information decoding circuit 16, from the decoded character information shown in FIG. 2, this control data causes the YNR circuit 17 to have a cyclic noise reduction coefficient of 0.5 and the CNR circuit 18 to have a cyclic noise reduction coefficient of 0.75. Is decoded and the YNR circuit 17 and the CNR circuit 18 are controlled. The correspondence between the character information and the control data is determined, for example, as shown in FIG. 2, such that the character information starting with "$$$", which is usually impossible, is a control parameter of the reproduction signal processing circuit. Good. The relationship between various parameters of the reproduction signal processing circuit and the character information may be such that the character and the parameter are associated with each other or that the first data is the luminance noise reduction parameter. Even when a character is displayed on a reproducing device or a television that does not support the control parameter, the screen display as shown in FIG.

Therefore, if the display of the character information is stopped, the original video signal can be reproduced correctly and the recorded contents are not destroyed, so there is no problem. When these noise-reduced luminance signal and chrominance signal are input to, for example, the television receiver 14, the recorded and reproduced video signal can be displayed.

FIG. 3 is a circuit configuration diagram for explaining a specific example of the noise reduction circuit. This is a noise reduction circuit that uses frame correlation of video signals.

From the input video signal, a signal delayed by one frame period in the frame memory 24 is subtracted by the subtractor 20,
Extract frame uncorrelated components. The limiter 21 limits the amplitude of the large-amplitude component to extract the small-amplitude component, and the coefficient unit 22 multiplies the small-amplitude component by a coefficient k (0 ≦ k <1) to obtain a noise component. This noise component is subtracted from the input video signal by the subtractor 19 to obtain a noise-reduced signal.
When the input video signal on the non-recursive side is selected by the switch 23 and output to the frame memory 24, non-recursive noise reduction is performed. The switch 23 selects the output signal of the subtractor 19 on the cyclic side to select the frame memory 24.
When output to, it becomes a cyclic noise reduction.

The switching of the switch 23 and the coefficient value of the coefficient circuit 22 are set based on the control signal from the control information decoding circuit 16.

The cyclic noise reduction has a large noise reduction effect, but cannot form a null point. The larger the noise reduction coefficient, the greater the effect, but the adverse effect of erroneously reducing the non-correlation component due to the change in the pattern as noise increases.

Therefore, by recording the noise reduction parameter in the character multiplex area and using it in the reproduction noise reduction circuit as in this embodiment, the afterimage is less likely to be adversely affected depending on the image and the effect is large. Enables noise reduction.

In this embodiment, the cyclic / non-cyclic switching and the coefficient are controlled, but the limiter level may be switched, or the frame noise reduction / field noise reduction / line noise reduction may be switched. The frequency band for noise reduction processing may be changed.

The reproduction signal processing is not limited to the noise reduction. Recently, we often detect motion of video such as motion adaptive noise reduction and perform processing according to the motion, but record motion detection parameter in character information area according to whether there is much motion of target video. By doing so, the optimum motion detection characteristic can be set for the image.

If the control parameters of the frequency characteristics such as the emphasis on the high frequency band and the drop of a certain frequency level are recorded, the image will be sharp or moist depending on the content of the image. It can be made into a picture. The signal processing is not limited to video processing, and a signal processing circuit for a reproduced audio signal may be controlled.

In this way, information obtained by digitally encoding the control parameters of the reproduction signal processing circuit in the teletext format is recorded and reproduced as a luminance signal having a wide recording and reproduction frequency band, and the signal processing circuit is controlled by this parameter during reproduction. As a result, the characteristics of the reproduction signal processing circuit can be optimized.

By the way, in order to stably reproduce the character information, it is desirable to remove the jitter of the reproduced signal by the time base collector. In addition, an S-VHS type VTR
The VTR of the ED beta system or the Hi8 system is not limited thereto. Further, the recording medium of the VTR is not limited to the magnetic tape, and the recording medium may be a disk or a semiconductor memory. Then, the modulation method for recording on the medium may be digital recording.

FIG. 4 is a circuit configuration diagram for explaining the second embodiment of the present invention. In this embodiment, VI
By combining with SS / VASS signals, it is easy to search for character information. The same components as those of the first embodiment are designated by the same reference numerals, and here, the relationship with the VISS / VASS signal, which is a difference from the first embodiment, will be mainly described.

The character encoder 5 during recording sends a trigger signal to the VISS / VASS creating / decoding circuit 26 when recording new character information. VISS / VASS creation / decoding circuit 26
The VISS / VASS signal is output according to the trigger, and the control head 25 records it on the control track of the magnetic tape 9.

An example of the time chart at this time will be described with reference to FIG. When recording a plurality of programs, four programs in this example, on the magnetic tape 9, the title of the program is recorded as character information at the start of recording the program, and at the same time, the VISS / VASS signal is recorded on the control track. The recorded contents of the tape are (a), VISS / VASS
The signal is (b). The upper part of (a) shows the video information, and the lower part shows the character information. (C) is a detection signal, (d)
Is a completion signal, (e) is tape speed, and (f)
Indicates a reduced multiple screen.

The operation during reproduction will be described. First, the tape is fed at high speed to set the fast-forward / rewind playback state. When the VISS / VASS creating / decoding circuit 26 detects the VISS / VASS signal from the signal reproduced by the control head 25, the detection signal is sent to the character decoder 27 and the tape running control circuit 28. With the detection signal, the tape running control circuit sets the tape feed to the normal reproduction speed. Further, the character decoder 27 starts decoding the character information signal.

When the character decoder finishes decoding the character information, it sends a completion signal to the tape running control circuit 28,
The tape running control circuit 28 returns the tape feed to the fast forward / rewind reproduction state. The screen reduction multiplexing circuit 29 reduces the character information for one screen coming from the character decoder, and creates one character information screen from the plurality of reduced screens. If this is switched to the luminance signal / color signal output by the switch circuit 30 and displayed on the television screen, the program information recorded on the tape can be confirmed.

FIG. 6 shows a display example of the reduction multiplex screen displayed on the television receiver 14 based on the output of the screen reduction multiplex circuit 29.

In this embodiment, the VISS / VASS signal is used as the cue signal, but the present invention is not limited to this. For example, a signal of a specific carrier frequency is recorded instead of the video signal for a predetermined period at the start of a program, You may make it search the carrier signal of this frequency at the time of reproduction | regeneration. A carrier signal outside the audible band may be recorded on the audio recording track. In the digital recording method, a pattern that cannot be normal video or audio may be recorded. Alternatively, a non-recorded portion may be created for a predetermined period and the non-recorded portion may be searched during reproduction.

Next, a third embodiment of the present invention will be described with reference to the circuit configuration diagram of FIG. The difference between this embodiment and the first and second embodiments described above is that the character information to be recorded with a display device can be confirmed at the time of recording. As a result, since the character information can be confirmed in advance, it is possible to eliminate erroneous characters. Furthermore, since it is possible to confirm the state in which the character information is displayed during reproduction, it is possible to set the character display position and the like at a more optimal position, such as preventing the character information from overlapping the important video.

In FIG. 7, the image pickup circuit 32 shoots an image in accordance with the scan timing signal STS of the synchronization generation / timing generation circuit 31. The luminance signal is sent to the multiplexing circuit 4, and the color signal is sent to the low frequency conversion circuit 3 and the character decoder 33. The multiplexing circuit 4 multiplexes the character information signal encoded by the character encoder 5 at a predetermined position in the vertical blanking period of the luminance signal. The multiplexed signal is the FM modulation circuit 6
Is output to the character decoder 33.

The character decoder 33 decodes the character information and displays it on the liquid crystal display device 34. Thereby, the character information to be recorded can be confirmed on the liquid crystal display screen. When it is not necessary to see the character information, the image being captured may be displayed.

FIG. 8 shows an example of screen display in this embodiment. The upper left is a screen for shooting, the lower left is a title screen for inputting characters, and the upper right is a screen where character information is decoded and displayed. A title is inserted in the shooting screen. The lower right is a recording signal on the tape, and the character information is recorded at a predetermined position in the vertical blanking period. This display screen is the same as the state where the reproduced signal is displayed on a television receiver that does not support teletext.

The character input is not limited to being encoded and then decoded and displayed. The so-called superimpose method is used to superimpose the character input on the recorded video signal and display it on the liquid crystal display. You may. Also,
The display device is not limited to the liquid crystal display.

[0044]

As described above, according to the present invention, by recording the control parameter of the reproduction signal processing circuit in the character information area and utilizing the information at the time of reproduction to control the reproduction signal processing circuit, It is possible to perform optimum reproduction signal processing according to the recorded signal content.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram for explaining a first embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a screen display example of control data input of FIG.

3 is a circuit configuration diagram for explaining a specific example of the noise reduction circuit of FIG.

FIG. 4 is a circuit configuration diagram for explaining a second embodiment of the present invention.

FIG. 5 is a timing chart during reproduction according to the second embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating a display example of a reduced multiplex screen according to the second embodiment of the present invention.

FIG. 7 is a circuit configuration diagram for explaining a third embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining a screen display example according to the third embodiment of the present invention.

FIG. 9 is an explanatory diagram for explaining an example of a waveform of a general character multiplex broadcast signal.

[Explanation of symbols]

1 ... Synchronous separation / timing generation circuit, 2 ... Y / C separation circuit, 3 ... Low frequency conversion circuit, 4 ... Multiplexing circuit, 5 ... Character encoder, 6 ... FM modulation circuit, 7 ... Adder, 8, 10 ... Magnetic head, 9 ... Magnetic tape, 11 ... Filter circuit, 12
... FM demodulation circuit, 13 ... High frequency conversion circuit, 14 ... Television receiver, 15, 27, 33 ... Character decoder, 16 ... Control information decoding circuit, 17 ... YNR circuit, 18 ... CNR circuit, 1
9, 20 ... Subtractor, 21 ... Limiter, 22 ... Coefficient circuit,
23 ... Switch, 24 ... Frame memory, 25 ... Control head, 26 ... VISS / VASS creation / decoding circuit, 28
... Tape running control circuit, 29 ... Screen reduction multiplex circuit, 30
... switch circuit, 31 ... synchronization generation / timing generation circuit, 32 ... imaging circuit, 34 ... liquid crystal display device.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04N 7/08 7/081

Claims (5)

[Claims] 1. A character multiplex encoding means for encoding control parameter data of a reproduction signal processing circuit such as parameters for motion detection or noise reduction into a character multiplex broadcast signal format as character information for character multiplex broadcasting, and encoding by said encoding means. And a recording processing circuit that modulates the recorded signal into a signal format for recording the signal multiplexed by the multiplexing unit and records the signal on a recording medium. A character multiplex broadcast recording device characterized by the following. 2. A control parameter of a reproduction signal processing circuit modulates a signal multiplexed in a teletext signal format and reproduces it from a recording medium in which it is recorded during a predetermined period of a vertical blanking period of a video signal. A reproduced video processing circuit for demodulating to the original video signal, a decoding means for decoding character multiplex broadcast signal format encoded data multiplexed in the output video signal of the reproduced video processing circuit, and control from the data decoded by the means A character multiplex broadcasting reproducing apparatus comprising a decoding means for decoding a parameter and a control means for controlling the reproduction signal processing circuit by the parameter. 3. Encoding means for encoding characters or data into a character multiplex broadcast signal format, multiplexing means for multiplexing the signal encoded by said encoding means in a predetermined period of a recording luminance signal, and said multiplexing means. A recording processing circuit that modulates and records the multiplexed signal in a signal format to be recorded on a recording medium, and a signal for cueing when new character information is encoded and recorded by the encoding means. A character multiplex broadcast recording apparatus comprising: 4. A first search means for searching a prerecorded cueing signal, and a character encoded in a prerecorded character multiplex broadcast signal format in a portion searched by the search means, or Decoding means for decoding the data information, second search means for searching for the next cueing signal after decoding by the decoding means, and a plurality of decoded characters or data information decoded by the decoding means. A character multiplex broadcast reproducing apparatus, comprising: a display unit for displaying the same on a single display screen. 5. The character multiplex broadcast recording according to claim 1, further comprising display means for displaying character information or data information to be encoded in the character multiplex format and recorded in the character multiplex area. apparatus.