JP2508495B2 - Video signal playback device - 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 for reproducing a video signal recorded in a first signal recording area and a PCM signal recorded in a second signal recording area of an oblique track formed by helical scanning. The present invention relates to a signal reproducing device.

[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 is possible in which a still image such as characters is superimposed on the video screen (moving image), and the moving image and the still image can be alternately switched to be displayed, or only the still image can be forwarded in a fixed time width one after another. Could not be displayed, or it was not possible to control the switching of the moving image / still image and superimposition in synchronization with the sound reproduction (narration, etc.).

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,
It is an object of the present invention to make it possible to easily and quickly control the reproduction of a tape and thereby obtain a variety of images with a large amount of information.

[0006]

According to a first aspect of the present invention, a video signal recorded in a first signal recording area of an oblique track on a magnetic tape and a PCM recorded in a second signal recording area are provided. In a video signal reproducing device for reproducing signals respectively, a video reproducing circuit for reproducing the video signal recorded in the first signal recording area and a PCM reproducing for reproducing the PCM signal recorded in the second signal recording area. A circuit, a detection unit for detecting a plurality of types of identification information indicating a processing mode of the PCM signal from the reproduction signal, a digital still image signal based on the reproduction signal from the PCM reproduction circuit, and a reproduction video from the video reproduction circuit. And a display processing unit having switching / mixing means for controlling switching and mixing with a signal. According to a second aspect of the present invention, the display processing unit includes a video RAM for storing a digital still image signal based on a reproduction signal from the PCM reproduction circuit.
Further , by controlling writing / reading of the video RAM according to the identification information, the still image information currently stored is repeatedly output until the next still image information is read. According to a third aspect of the present invention, the display processing section further comprises a video RAM for storing a digital still image signal based on the reproduction signal from the PCM reproduction circuit, and the video RAM is written in accordance with the identification information. By controlling reading / reading, a digital still image signal for one screen recorded over a plurality of tracks in the second recording area is read into the video RAM, and a still image display signal for one screen is output. is there. Further, in the invention of claim 4, the display processing section further comprises a video RAM for storing a digital still image signal based on a reproduction signal from the PCM reproduction circuit, and the video R according to the identification information.
By controlling the writing / reading of AM, the still image information currently stored is repeatedly output until the identification information indicating the end of display is detected.
According to a fifth aspect of the present invention, the display processing unit is the PC.
A video RAM for storing a digital still image signal based on a reproduction signal from the M reproduction circuit is further provided, and by controlling writing / reading of the video RAM according to the identification information, until the identification information indicating audio recording is detected. The still image information currently stored is repeatedly output.

[0007]

[Function] Based on the identification information corresponding to the digital still image signal and the digital audio signal, switching of the still image display in time with narration voice, mixing / switching with the video screen (moving image), display time width of the still image Playback of programs that can be executed by the CPU
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.

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, since the identification information, which is a simple code signal, is detected along with the reproduction of the tape, it is complicated to reproduce and read the program executable by the conventional CPU. With a simple configuration and control that does not rely on various information processing steps, it is possible to switch the still image display according to the narration, mix / switch with the video screen (moving image), and quickly control the display mode such as the display time width. By combining moving images, still images, and audio, a variety of video and audio with a large amount of information can be obtained. And controls the switching and mixing of the digital still picture signal and the reproduced video signal in accordance with Reclaimed identification information was or, or be displayed by switching video and still images are alternately be or be displayed in a superimposed both By the detection of the identification information accompanying the reproduction of the tape, it is automatically and quickly performed with a simple configuration and control. Bill again
According to the invention of Item 2, by controlling the writing / reading of the video RAM in accordance with the identification information, the still image information currently stored is repeatedly output until the next still image information is read. With the control, still images related to the moving image can be displayed one after another as time passes (tape reproduction). According to the third aspect of the present invention, by controlling the writing / reading of the video RAM according to the identification information, the digital still image signal for one screen recorded in the second recording area over a plurality of tracks is stored in the video RAM. Since it reads and outputs a one-screen still image display signal, the simple configuration is possible even if one screen such as a color still image or a multi-gradation still image is not recorded due to the small recording capacity of the second recording area. With control, digital still image signals over a plurality of tracks can be stored in the RAM according to the identification information as the tape is reproduced, and a color still image, a multi-tone still image, etc. can be displayed. Further, according to the invention of claim 4, by controlling the writing / reading of the video RAM according to the identification information, the currently stored still image information is repeatedly output until the identification information indicating the end of the display is detected. Therefore, with a simple configuration and control, it is possible to easily control the display time width of the still image switched from the moving image along with the tape reproduction or the still image displayed by being superimposed on the moving image. Further, according to the invention of claim 5, by controlling the writing / reading of the video RAM according to the identification information, the still image information currently stored is repeatedly output until the identification information indicating the audio recording is detected. With a simple configuration and control, it is possible to easily control the switching of the still image display according to the audio reproduction such as the narration accompanying the tape reproduction.

[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 20 display processing circuit 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-55-161478 (JP, A) Special Features Kai 57-30476 (JP, A) JP-A 56-64579 (JP, A) Actual development Sho 56-71678 (JP, U)

Claims (5)

(57) [Claims] 1. A video signal reproducing apparatus for reproducing a video signal recorded in a first signal recording area and a PCM signal recorded in a second signal recording area of an oblique track on a magnetic tape, respectively. A video reproducing circuit for reproducing the video signal recorded in the signal recording area, a PCM reproducing circuit for reproducing the PCM signal recorded in the second signal recording area, and a processing mode of the PCM signal from the reproduced signal. And a switching unit for controlling switching and mixing of a digital still image signal based on a reproduction signal from the PCM reproduction circuit and a reproduction video signal from the video reproduction circuit according to the identification information. And a display processing unit having a mixing means. 2. The display processing section further comprises a video RAM for storing a digital still image signal based on a reproduction signal from the PCM reproduction circuit, and controls writing / reading of the video RAM according to the identification information. until the next still picture information is read, to claim 1, characterized in that repeatedly outputs still image information currently stored
The video signal reproducing device described . 3. The display processing unit further comprises a video RAM for storing a digital still image signal based on a reproduction signal from the PCM reproduction circuit, and controls writing / reading of the video RAM according to the identification information. , A digital still image signal for one screen recorded over a plurality of tracks in the second recording area is added to the video RA.
2. The video signal reproducing device according to claim 1, wherein the video signal reproducing device reads data into M and outputs a still image display signal of one screen. 4. The display processing section further comprises a video RAM for storing a digital still image signal based on a reproduction signal from the PCM reproduction circuit, and controls writing / reading of the video RAM according to the identification information. The video signal reproducing apparatus according to claim 1, wherein the still image information currently stored is repeatedly output until the identification information indicating the end of display is detected. 5. The display processing section further comprises a video RAM for storing a digital still image signal based on a reproduction signal from the PCM reproduction circuit, and controls writing / reading of the video RAM according to the identification information. The video signal reproducing apparatus according to claim 1, wherein the still image information currently stored is repeatedly output until the identification information indicating the audio recording is detected.