JPH0197078A - Recording medium and reproduced signal processor therefor - Google Patents

Abstract

PURPOSE:To combine a pseudo video which corresponds to the content of a real video and corresponds to the input operation of the operator of a processor so as to attain display based on digital data by inputting digital data constituted by means of codes to a part of a video signal period where analogue data are inputted to record them. CONSTITUTION:Analogue data on the real video obtained by making an object into the video is inputted to the video signal period and a recording medium which has modulated and recorded picture signals where digital data constituted by the codes are inputted is generated by using a part of the video signal period. Data are reproduced in a recording and reproducing device(VTR), and a large quantity of coded digital data which are synchronous with or which precedes to a change in the display content of the real video are fetched from the reproduced signals in the reproduced signal processor. Furthermore, a part of digital data is selected according to the input operation of the user of the processor from a keyboard and the pseudo video is generated based on digital data which have been thus obtained. The change of the real video and timing are combined, the pseudo video and the real video are combined so as to generate the signals of the videos and they are supplied to a video reproduction device (television receiver).

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording medium on which both analog data and digital data are recorded, and processing of a reproduction signal of the recording medium.

<Terminology> The image signal referred to in this specification is a signal that has a video signal period, a vertical retrace period, and an underwater retrace period, and has a signal that can be displayed on a video reproducing device during the video signal period.

<Conventional technology and its problems> V as a recording/playback device that plays back image signals from a recording medium
TR and video disc players are becoming popular, but the recording media they play usually contains real video signals consisting of analog data obtained by visualizing the subject, and this is played back. However, since it is only analog data, it is not possible to display interactive images that change in response to the user's needs. In addition, some video tapes used for learning have analog data of real images and sounds recorded on the video track and audio track, respectively, and digital data consisting of codes is recorded on part of the audio track. . With this video tape, the actual audio is interrupted when the digital data is reproduced, and the amount of digital data reproduced per unit time is small, so complex information processing cannot be performed in accordance with changes in the moving real video.

Another method for reproducing digital data composed of codes from a videotape is a method in which video information is not recorded on an image track, but instead audio information is reproduced from a recording medium on which PCM recording is made. In this method, image signal reproduction cannot be performed simultaneously.

On the other hand, a method of superimposing digital data for pseudo video onto an image signal consisting of analog data using a small number of scanning lines during the vertical retrace period has been put to practical use in teletext broadcasting. However, one bit of a teletext digital signal is very short (approximately 175 ns), which is less than half of the PCM recording described above, so it is difficult to record and play it back with a recording/playback device. If the scanning line portion is used to record at the same density as the PCM recording mentioned above, the amount of digital data that can be played back per unit time will be small. Information is inserted during the retrace period, but this causes the superposition of digital data to go unnoticed.

In order to incorporate moving real video played back from a recording medium by a recording/playback device and display the video in an interactive manner, an information processing device directly connected to the recording/playback device and a code for operating the information processing device are required. It is necessary to reproduce a large amount of the recorded digital data together with the analog data, but this cannot be done using conventional recording media and conventional reproduction devices.

<Object of the Invention> The present invention eliminates such conventional drawbacks, makes it possible to read out a large amount of digital data related to video display from the same recording medium in a short time while reproducing real video, and to reproduce the real video. It is possible to change and display a video that is a combination of pseudo videos in response to the input operations of the device user and also in response to the content of the actual video.

<Means for solving the problem> Analog data related to the real image obtained by visualizing the subject is inserted into the video signal period, and at the same time, digital data composed of codes is input using a part of the video signal period. A recording medium is created by modulating and recording an image signal. After this is played back by a recording/playback device, a large amount of encoded digital data that is synchronized with or precedes changes in the displayed content of the actual video is extracted from the playback signal, and a portion of this digital data is transmitted to the user of the device. A pseudo video is created based on the digital data obtained by this input operation, and a video signal is created by combining the pseudo video and the real video by matching the timing with changes in the real video.

<Example> FIG. 1 shows an example of a regeneration processing system in which the present invention is implemented. A recording/playback device (VTR) that plays a recording medium (video cassette tape) and a video playback device (TV receiver)
A reproduction signal processing device is connected between them, and auxiliary input devices (microphone, simulation unit) and auxiliary output devices (headphones, printer) are further connected to these.

The playback signal processing device in this example is a computer with a keyboard, but in addition to general circuits including memory and CPU, it also includes a digital signal extraction circuit, an analog signal processing circuit, a timing signal extraction circuit, an error correction circuit, a pseudo video This is a computer that also incorporates a creation circuit, a video signal synthesis circuit, a pseudo-audio creation circuit, an audio signal synthesis circuit, a volume control circuit, and a recording/playback device control signal generation circuit.

Other examples of regeneration processing systems implementing the present invention are shown in Figs.
It is shown in FIG. The difference from the example shown in FIG. 1 is that in the example shown in FIG. 2, the recording medium is a video disc, and the recording/playback device is a video disc player. In the example of FIG. 3, the playback signal processing device A includes a digital signal extraction circuit, an analog signal processing circuit, a timing signal extraction circuit, a memory circuit, an error correction circuit, a video signal synthesis circuit, an audio signal synthesis circuit, a volume control circuit, and a recording circuit. Playback signal processing device B (small computer) that has a playback device control signal generation circuit and a keyboard.
are connected by a cord. In the example of FIG. 4, the playback signal processing device is combined with a recording and playback device (VTR),
The input section including the keyboard emits infrared signals to transmit input operations by the device user to the reproduction signal processing device. In the example of FIG. 5, the reproduction signal processing device is combined with a video reproduction device (television receiver), and the input section is separated as in the example of FIG.

In the playback signal processing device, as shown in FIG. 7, the image signal coming from the recording and playback device is converted into an analog signal (1) and a digital signal (2) related to the actual video by a digital signal extraction circuit.
Next, the digital signal is separated into a timing signal and digital data (3) by a timing signal extraction circuit, and then the digital data is error corrected. Next, digital data that matches the specifications that have been input and stored in advance into the reproduced signal processing device by the user of the device through keyboard operations is selected and stored in the main memory. Next, digital data corresponding to the specifications of the device user and corresponding to the contents of the actual video are selected and retrieved one after another from the main memory in synchronization with the timing signal. The digital data selected as described above is processed by a pseudo video creation circuit and a pseudo audio creation circuit.
They are converted into a pseudo video signal (4) and a pseudo audio signal (6), respectively. The pseudo video signal is combined with the processed analog signal in a video synthesis circuit, and the resulting composite image signal (5) is output to a video reproduction device (television receiver) either as is or after being RF modulated. Pseudo audio signal (6
) is synthesized with the analog audio signal coming from the recording/playback device or the microphone in the audio signal synthesis circuit, and the resulting synthesized audio signal (7
) is output to a playback device (headphones, television receiver) after volume adjustment or RF modulation. A part of the digital data for the pseudo video is also diverted to other output devices, and is output to the connected auxiliary output device (printer) when an instruction is given by the device user's keyboard operation. Another method of input by the device user may be through keyboard operations and a simulation unit that generates book value signals.

When a conventional videotape (Fig. 8A) on which an image signal containing only analog data is recorded during the video period is played back on a VTR in the conventional manner (Fig. 6), except for the vertical blanking period,
l The signal during the horizontal scanning period has a waveform that can change continuously (a schematic diagram is shown in Figure 1A), and when an image is displayed on a television receiver, 482 scanning lines of similar signals are gathered per frame, and the analog The actual image based on the data is displayed on the entire screen. On the other hand, in the recording medium of the present invention, the eighth
As simplistically illustrated in Figure 9 and Figure 9, the video signal period of each field is There are areas in which analog data and digital data are each recorded as modulated signals. When these recording media are played back on a VTR or video disc player in the conventional manner and the images are displayed on a television receiver, as shown in Figure 11 A, B, C, and D, digital data is displayed on the screen in addition to the actual images. The signals are displayed as they are as a collection of broken lines, indicating that digital data is recorded on this recording medium.

Note that in FIG. 8C, the number of zones has been reduced to about 1150 and is drawn schematically.

Regarding the video signal period of the recording medium, for example, the first two-thirds of each field contains analog data as shown in Figure 10A, and the remaining one-third contains digital data as shown in Figure 10B. Recording medium (Figure 8 B1 Figure 9 A
, B), the screen will look like Figure 11A, and it is a recording medium in which Figure 10B is similarly inserted in the first 1/3 of each field, and Figure 1O Figure 8 is inserted in the remaining 2/3 of each field. and
The screen will look like Figure 11B, and the first 2/3 of each field will contain Figure 10A, and the remaining 1/3 will have Figure 1O C.
If the recording medium is recorded with , the screen will be as shown in Figure 11, and if the recording medium is recorded with Figure 10C inserted in each field (Figure 8C), the screen will be as shown in Figure 11C. The screen will look like this. However, the proportion of the area containing digital data is not limited to the above example.

In the example of FIG. 11A, digital data is recorded in 160 scan lines per frame, and 8
Compared to teletext, which uses the scanning lines of a book, it contains far more digital data. Insert digital data here that slightly precedes the actual video display content in each frame (even if the video content involves movement or changes, digital data that always precedes the change in display content as the screen progresses) is inserted here. Data is added to the main memory.From the large amount of digital data obtained in this way, the digital data that corresponds to the operation of the device user is selected and entered in synchronization with the moment when the content of the actual video changes. Pseudo video signals are created one after another based on the digital data selected from the main memory while adjusting to changes in the real video using timing signals.The pseudo video signals created in this way are illustrated in Fig. 12. , the inserted image signals are synthesized so that the pseudo image appears on the screen in the area indicated by the broken line in Figure 11.Furthermore, according to the screen position information included in the digital data and the direction instruction input by the device user, the real image is synthesized. A part of the analog data related to the real video is replaced with a pseudo video and an image signal to be displayed is synthesized.Following the image contour information included in the digital data and the direction instruction input by the device user, a part of the analog data related to the real video is processed to create an image. After moving a part of the image, a pseudo image based on digital data is inserted and an image signal is synthesized.

In situations where there is no need to change the display content of the pseudo video,
The digital data that will be needed later is stored in the digital data area of the video track for such a scene, and a large amount of digital data is extracted from here and stored in the main memory. The video track at the end of the video track contains digital data for generating the recording/playback device control signal (8 in Figure 7), and this control signal causes the recording/playback device to stop or rewind only. At this time, an image signal consisting only of pseudo images is created based on the digital data stored in the main memory in advance.Also, in video tracks for scenes where digital data is not required, the digital data area is Without this, only the analog data area is left.

<Effects of the Invention> As described above, according to the present invention, it is possible to read out digital data composed of a large amount of codes from the same recording medium in a short time while reproducing real video using the recording medium. Furthermore, based on the digital data, it becomes possible to display a pseudo image that corresponds to the content of the real image and also corresponds to the input operations of the device user in combination with the real image. Furthermore, when the recording medium of the present invention is played back and displayed using only a recording/playback device and a video playback device in the conventional manner without being processed by an information processing device, the existence of digital data can be notified by a broken line.

[Brief explanation of the drawing]

FIGS. 1 to 5 are examples of regeneration processing systems embodying the present invention. FIG. 6 shows a conventional playback system. FIG. 7 is a block diagram schematically showing the flow of signals in a reproduction processing system embodying the present invention. FIG. 8 is a schematic diagram of videotape recording, illustrating a one-field video trough, .DELTA. is the conventional one, and B and C are the embodiments of the present invention. FIG. 9 is a similar schematic diagram of a video disc embodying the invention, where A is a VHD format and B is a CAV format. Figure 1O shows the outline of the waveform of the I horizontal scanning period consisting of the video signal period and the horizontal retrace period of the image signal.
indicates that both analog data and digital data are included in the video signal period. FIG. 11 is an image display of broken lines indicating the digital data portion. 12th
The figure shows an example of a composite image in which the present invention is implemented. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Data Data Figure 10 Figure 11 Figure 12

Claims (14)

[Claims] (1) A recording medium characterized by recording an image signal in which digital data composed of codes is inserted into some video signal periods and analog data is inserted into other video signal periods. (2) The recording medium according to claim 1, which includes data regarding the creation of a pseudo video as digital data composed of codes. (3) Claim 1 includes data regarding control of a recording/playback device as digital data composed of codes.
Recording medium described in section. (4) The recording medium according to claim 1, which includes a timing signal for video switching as digital data made up of codes. (5) The recording medium according to claim 1, which contains data obtained by photographing a moving subject as analog data. (6) The recording medium according to claim 1, wherein the recording medium is a video cassette tape. (7) The recording medium according to claim 1, wherein the recording medium is a video disc. (8) Insert digital data composed of codes into a part of the video signal period in the image signal reproduced from the recording medium,
A reproduction signal processing device characterized in that, when an image signal containing analog data is input in another video signal period, information processing regarding the input signal is performed. (9) The reproduced signal processing device according to claim 8, wherein the information processing extracts digital data from the input signal. (10) Claim 8, characterized in that the information processing selects digital data that matches the input operation of the device user from digital data in the input signal.
The reproduced signal processing device described in Section 1. (11) The reproduction according to claim 8, wherein the information processing creates a signal that is reproduced as a pseudo video when input to a video reproduction device, based on digital data in the input signal. Signal processing device. (12) The reproduced signal processing device according to claim 8, wherein the information processing changes a part of analog data included in the image signal based on digital data in the input signal. (13) Information processing generates an image signal for displaying a combination of a pseudo video signal synthesized based on digital data in the input signal and a signal containing analog data played back by a recording/playback device. 9. The reproduced signal processing device according to claim 8, wherein the reproduction signal processing device is characterized in that: (14) The playback signal processing device according to claim 8, wherein the information processing generates a signal for controlling a recording/playback device based on digital data in the input signal.