JP2508496B2 - Video signal recorder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording apparatus in which one end of an oblique track formed by helical scanning is extended and a time-compressed coded audio signal is recorded therein.

[0002]

2. Description of the Related Art When character images such as titles, casts, and explanations are to be recorded later on a VTR-recorded image, these images are generally inserted into the original image information by insert editing. However, with this method, it is not possible to superimpose a character image on the original image (superimpose). Although character images can be overlaid and recorded while performing dubbing using at least two VTRs (recording and reproducing), this method is complicated and causes deterioration in image quality, and the apparatus becomes large in size.

In Japanese Patent Laid-Open No. 55-161478, a still video information such as characters and figures is frequency-converted into a frequency band of an audio signal and recorded on an after-recording audio track, and the reproduced video is reproduced. A video superimposing method is disclosed in which characters, figures, and the like are superposed on a screen.

[0004]

In the above-mentioned prior art,
Only one type of display mode, such as superimposing characters etc. on the video screen (moving image), is possible, and the moving image and the still image are alternately switched to be displayed, or only the still image is displayed one after another with a fixed time width. It is not possible to obtain a wide variety of information-rich videos that combine audio with video and still images by controlling the video / still image switching and superimposing in time with audio playback (narration, etc.). It was

In Japanese Patent Laid-Open No. 57-30476, a video disk, on which a video signal and an audio signal are frequency-multiplexed and recorded, is partially recorded with a program signal executable by a CPU instead of the audio signal. Play C
It is loaded into the program memory of the PU, and by executing the program, specific images and sounds are processed in a predetermined order, for a predetermined time
It is disclosed that the disc player is controlled so as to reproduce in a predetermined mode. But such a CPU
It is not easy for a user to create an executable program in a disc and record it on a disc, and a method of purchasing a disc on which a program signal is recorded in advance and reproducing the video information in a programmed mode is used. There was nothing else. Further, there is a problem that quick control cannot be performed because the processing steps such as reproduction of the program signal, reading into the memory, and execution are required. In view of this problem, the present invention is not limited to the C / V / V / V / V playback mode (switching, mixing, etc.).
Regardless of playing or reading the program executed by PU,
The user can easily set various playback modes by using a simple control code in order to easily and quickly control the playback of the tape and thereby obtain a wide variety of information-rich images. The purpose is to do so.

[0006]

According to a first aspect of the present invention, in a video signal recording apparatus for recording a video signal on an oblique track of a magnetic tape by helical scanning by a rotary head, the oblique track is a first signal recording area. And a second signal recording area, and a video signal recording circuit for recording the video signal in the first signal recording area, and a digital still image signal and a digital audio signal are selectively supplied. 2. A PCM signal recording circuit for selectively recording the digital still image signal or digital audio signal converted into PCM in the signal recording area of No. 2, and controlling switching and mixing of the reproduced digital still image signal and the reproduced digital audio signal on the reproducing side. In order to do the second
Of the identification information code signal to be recorded in the signal recording area of
And an identification information generating circuit to be supplied to the CM signal recording circuit. According to a second aspect of the present invention, the identification information generating circuit controls writing / reading of a video RAM for storing a reproduced digital still image signal on the reproducing side until the next still image information is read. In order to repeatedly output the still image information currently stored, an identification information code signal to be recorded in the second signal recording area is supplied to the PCM signal recording circuit. According to a third aspect of the present invention, the identification information generating circuit writes / writes in a video RAM for storing a reproduced digital still image signal on the reproducing side.
By controlling reading, the digital still image signal for one screen recorded in the second recording area over a plurality of tracks is read into the video RAM, and a still image display signal for one screen is output. The identification information code signal to be recorded in the second signal recording area is supplied to the PCM signal recording circuit. In a fourth aspect of the present invention, the identification information generating circuit controls the writing / reading of the video RAM storing the reproduced digital still image signal on the reproducing side, whereby the identification information indicating the end of display is detected. Up to the second information corresponding to the identification information , in order to repeatedly output the still image information currently stored.
Of the identification information code signal to be recorded in the signal recording area of
This is a configuration for supplying the CM signal recording circuit.

[0007]

It is possible to record moving images, still images, and audio in a mixed manner, and it is possible to easily set the reproduction mode of these combinations by specifying and recording the identification information code signal assigned on the recording side. On the playback side, the playback of a program that can be executed by the CPU, such as switching the still image display in time with the narration sound, mixing / switching with the video screen (moving image), and displaying the display time width of the still image, The operation is simple and quick by controlling the video RAM, the switching / mixing device, etc. by the identification information, which is a simple code signal obtained from the reproduction signal, without depending on the reading.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. FIG. 1 is a block circuit diagram of a recording / reproducing system of a VTR to which the present invention is applied, and FIG. 2 is a track diagram showing a recording format on a magnetic tape.

As shown in FIG. 1, the magnetic tape T is wound around the peripheral surface of the rotary head drum (1) at an angle of about 210 °, and a pair of heads A and B having an interval of 180 ° slant the track (shown in FIG. 2). 17A) and (17B) are formed alternately. The section (a to b) of the winding angle of about 30 ° becomes the recording portion S _P of the encoded audio signal of the track shown in FIG.
The section (b to c) of 0 ° is the recording portion S _{V of the} video signal.

The video signal is supplied to the rotary magnetic heads A and B through the video recording circuit (2) and the head input / output switching circuit (3), and the video recording portion S of the track shown in FIG.
Recorded in _V.

Audio signals of the right and left channels L + R and L-R (or audio signals of L and R) are sent to the PCM recording circuit (6) via the A / D converter (4) and the channel switching circuit (5). Given, correction code, data sync, PLL
Additional processing such as synchronization clock, time axis compression, NR
Conversion to the Z code system and processing of FM modulation are performed. PCM
Of speech signal head A through the input-output switching circuit (3), is supplied to B, and the encoded audio signal recording portion S _P output track, the contents of the two channels (L + R data 1, L
-R is recorded as data 2) as shown in the diagram of the recording format of FIG.

When characters, such as titles, casts, explanations, etc., are to be superimposed on the recorded video source, the necessary information is picked up by a TV camera and given as a still image input to the A / D converter (8) for digital input. After being converted into a signal, it is once written in the video RAM (9). Then, while watching the playback monitor of the already recorded video source, the digital still image is read from the video RAM (9) at the desired insertion position, and the channel switching circuit (5) reads, for example, the second still image.
Channel (LR) is selected and recording (after recording) is performed through the PCM recording circuit (6). As a result, it is possible to record character information without affecting the video recording portion S _V. Regarding the audio, the already recorded L + R channel monaural audio information remains, so that the reproduced audio can be obtained without any trouble.

Along with recording digital still image information, VT
An ID (identification) signal is formed in the ID generation circuit (7) on the basis of the mode signal generated from the operation unit of R. This ID signal identifies whether the content of the PCM recording portion S _P is audio information or still image information, controls the acquisition of data at the time of reproduction, and controls audio and video as described later. It is a code signal for instructing a reproduction mode. The ID signal is given to the PCM recording circuit (6),
It is recorded together with the PCM data at a predetermined position of the PCM recording portion S _P in FIG. As the recording format of the ID signal, an ID bit is provided in the data recording portion, or a clock signal for PLL synchronization during reproduction is 101010 ----------
To 110110 ----------, or various methods of changing the pattern of the data sync or the delimiter marker can be adopted.

The digital still image to be after-recorded may be, for example, a screen (18) having 192 dots vertically and 256 dots horizontally as shown in FIG. If a screen monochrome, it is possible to record one still image on a PCM recording portion S _P output one track. Again 1
16-color color still images may be recorded with 4 bits per dot. In this case, it is necessary to record still image information over 2 to 16 tracks.

A so-called analog still image in which intermediate colors are also displayed can be digitized and recorded. In this case, dozens to hundreds of trucks are required. Further, information such as quizzes and answers to problems, which are generated by using a microcomputer, and contents of character multiplex broadcasting may be recorded. In the case of a digital still image as shown in FIG. 4, the same color portion is converted into information such as size and length to reduce the amount of recorded information, and several pieces of still image information are recorded in one track. It is also possible to record

The insertion position of the still image can be selected in a gap of voice or a gap of talk when music or narration is already recorded. 2 channel recording part (data 1, data 2) in the part with no audio information
Both can be used for still image recording. When a track for several tens to 100 fields is required for one piece of still picture information, the still picture information can be intermittently recorded for each gap of the audio information.

Next, reproduction will be described. Head A,
The reproduction signal of B passes through the input / output switching circuit (3), is branched into a video signal and a PCM signal, and is supplied to the video reproduction circuit (13) and the PCM reproduction circuit (10), respectively.
In the PCM reproduction circuit (10), the ID signal is extracted and I
The control signals are sent to the D detection circuit (16) and various control signals for controlling the reproduction mode of the image and the sound are generated. These control signals are distributed to the distribution switch circuit (11) and the video RAM.
(9), D / A converter (14), switching / mixing circuit (1
5) is supplied to the display processing circuit (20).

In the recording portion of a normal encoded audio signal, P
The output of the CM reproduction circuit (10) is the branch switch circuit (1
It is given to the D / A converter (12) as an audio signal of 2 channels (L, R) through 1) and is derived as an audio monitor output.

In the portion where the still image information is recorded, the ID detection circuit (16) detects this and the distribution switch circuit (11).
To the video RAM (9) from the switch circuit (11) to output the still image information of the PCM reproduction circuit (10).
Given to. At this time, the distribution switch circuit (11)
PCM recording portion S audio information of the first channel has been left to the _P L + R performs switching operation so that both the output of the left and right channel (monaural). Therefore, the reproduced sound is output without interruption at the still image recording portion.

The still picture information written in the video RAM (9) is read out by the control of the ID detection circuit (16),
After being converted into a video signal by the D / A converter (14),
Derived through the switching / mixing circuit (15). Video R
The read control of AM (9) is performed based on the ID information,
For example, when still image information is obtained in a certain field, it is repeatedly output until the next information is collected. Alternatively, output until the ID information indicating the end of display is reproduced,
Alternatively, control is performed such that the output is continued until the normal voice recording mode is restored.

The control signal at the output of the ID detection circuit (16) also controls the switching / mixing circuit (15). Playback ID, for example
Depending on the information, the still image video signal and the video playback circuit (1
Is the video signal output from 3) switched and sent?
Alternatively, control is performed such that a still image video signal is superimposed (superimposed) on the video signal and sent out.

[0022]

According to the present invention, it is possible to record a moving picture, a still picture, and an audio in a mixed manner, and it is possible to easily perform the designated recording of the identification information code signal in which the reproduction mode of these combinations is assigned on the recording side. It can be set. Therefore, on the playback side, a display mode such as switching of still image display in time with narration sound, mixing / switching with a video screen (moving image), display time width of still image, etc. It can be executed simply and quickly by controlling the video RAM, the switching / mixing device, etc. by the identification information, which is a simple code signal obtained from the reproduction signal along with the tape reproduction, without depending on the reproduction or reading. Like Further, according to the first aspect of the present invention, a CPU can execute and record a reproduction mode in which a reproduction side alternately displays a moving image and a still image and displays both of them. It is possible to set easily by specifying and recording the identification information code signal by the user. Further, according to the second aspect of the present invention, by controlling the writing / reading of the video RAM according to the identification information on the reproducing side, a reproducing mode in which still images related to the moving image are displayed one after another as time passes (tape reproduction) The CPU
It is possible to easily set by specifying and recording the identification information code signal by the user, instead of creating and recording an executable program. According to the third aspect of the invention, by controlling the writing / reading of the video RAM according to the identification information on the reproducing side, a digital still image signal over a plurality of tracks is accumulated in the RAM according to the identification information according to the reproduction of the tape, and the color still image is stored. The control mode for displaying a multi-gradation still image or the like can be easily set by designating and recording the identification information code signal by the user instead of creating and recording a program executable by the CPU. According to the fourth invention,
A control mode for controlling the display time width of a still image switched from a moving image along with tape playback or a still image displayed by being superimposed on the moving image by controlling writing / reading of the video RAM according to the identification information on the reproducing side. Can be easily set by the designated recording of the identification information code signal by the user, without depending on the creation and recording of the program executable by the CPU.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a recording / reproducing system of a VTR according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of tracks showing a recording pattern on a magnetic tape.

FIG. 3 is a schematic diagram showing a recording format of a recording portion of the encoded audio signal of the track of FIG.

FIG. 4 is a schematic diagram of a screen showing an example of still image information to be after-recorded.

[Explanation of symbols]

1 rotary head drum 6 PCM recording circuit 7 ID generation circuit 17A track 17B track 18 screen T magnetic tape S _V video signal recording part _SP PCM signal recording part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Nakano 4-14-1, Asahi-cho, Atsugi-shi, Kanagawa Sony Corporation Atsugi Plant (56) References JP-A-54-125014 (JP, A) Special Features Kai 55-161478 (JP, A)

Claims (4)

(57) [Claims] 1. A video signal recording apparatus for recording a video signal on an oblique track of a magnetic tape by helical scanning by a rotary head, wherein the oblique track has a first signal recording area and a second signal recording area, and A video signal recording circuit for recording the video signal in the first signal recording area, and a digital still picture signal and a digital audio signal are selectively supplied, and the digital still picture converted into PCM in the second signal recording area. A PCM signal recording circuit for selectively recording an image signal or a digital audio signal, and a second signal recording area for controlling switching and mixing of the reproduced digital still image signal and the reproduced digital audio signal on the reproducing side. An identification information generating circuit for supplying an identification information code signal to be recorded to the PCM signal recording circuit. A video signal recording device characterized by the above. 2. A video signal recording apparatus for recording a video signal on an oblique track of a magnetic tape by helical scanning by a rotary head, wherein the oblique track has a first signal recording area and a second signal recording area, and A video signal recording circuit for recording the video signal in the first signal recording area, and a digital still picture signal and a digital audio signal are selectively supplied, and the digital still picture converted into PCM in the second signal recording area. PCM signal recording circuit for selectively recording image signals or digital audio signals, and video R for storing reproduced digital still image signals on the reproducing side
An identification information code recorded in the second signal recording area in order to repeatedly output the currently stored still image information until the next still image information is read by controlling the writing / reading of AM. A video signal recording apparatus comprising: an identification information generating circuit for supplying a signal to the PCM signal recording circuit. 3. A video signal recording apparatus for recording a video signal on an oblique track of a magnetic tape by helical scanning by a rotary head, wherein the oblique track has a first signal recording area and a second signal recording area, and A video signal recording circuit for recording the video signal in the first signal recording area, and a digital still picture signal and a digital audio signal are selectively supplied, and the digital still picture converted into PCM in the second signal recording area. PCM signal recording circuit for selectively recording image signals or digital audio signals, and video R for storing reproduced digital still image signals on the reproducing side
By controlling the writing / reading of AM, the second
In order to read the digital still image signal of one screen recorded in the recording area of a plurality of tracks into the video RAM and output the still image display signal of one screen,
An identification information generating circuit for supplying an identification information code signal to be recorded in the second signal recording area to the PCM signal recording circuit. 4. A video signal recording apparatus for recording a video signal on an oblique track of a magnetic tape by helical scanning by a rotary head, wherein the oblique track has a first signal recording area and a second signal recording area, and A video signal recording circuit for recording the video signal in the first signal recording area, and a digital still picture signal and a digital audio signal are selectively supplied, and the digital still picture converted into PCM in the second signal recording area. PCM signal recording circuit for selectively recording image signals or digital audio signals, and video R for storing reproduced digital still image signals on the reproducing side
By controlling the writing / reading of AM, the above-mentioned identification is performed in order to repeatedly output the still image information currently stored until the identification information indicating the end of display is detected.
A video signal recording apparatus comprising: an identification information generating circuit which supplies an identification information code signal to be recorded in the second signal recording area in correspondence with information to the PCM signal recording circuit.