JPH0449792A - Recording medium playing device - Google Patents

Abstract

PURPOSE:To attain recorded orchestral accompaniment reproducing without damaging character information by executing chroma key synthesizing to a video signal to correspond to the video source of a side which does not include the character information when the video source includes the character information. CONSTITUTION:When a changeover switch SW1 is made switched into a movable contact (b) side and a changeover switch SW 2 is made switched into the movable contact (b) side in a condition that writing to a picture memory 15 is inhibited, a still picture is outputted in one video output and a moving picture reproduced from a normal disk is outputted in the other video output. The video output from the SW2 is supplied to a chroma key synthesizing circuit 20 through a D/A converter 19b and an external video signal obtained from a video camera 21 is chroma-key-synthesized. The chroma-key-synthesized signal and a signal not chroma-key-synthesized are supplied to the both movable contacts of a changeover switch SW3 repectively and a controller 28 switch- controls the SW3 so as to select any output by a command from an external operation key.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a recording medium playing device such as a video disc player.

[Background technology]

For example, a recording medium performance device having a function of chromakeying a video signal obtained from a video camera with a video signal obtained by playing a recording medium is disclosed in Japanese Patent Application Laid-Open No. 1-318385.
It is known from the publication no.

As described above, a recording medium performance device equipped with a ROMA key synthesis function has the advantage that any object photographed by the user can be combined into a video obtained by playing the recording medium. However, if the video obtained by playing on a recording medium contains text information such as the explanation of the video or the lyrics of the station, the disadvantage is that the text information may be partially or completely erased by the chromakey composite video. If this device is used as a karaoke device, a phenomenon occurs in which the user cannot sing because the lyrics are no longer visible.

[Conventional technology]

In order to overcome this drawback, the present applicant filed a patent application filed in 1993.
The technique described in No. 5048 was proposed.

According to this conventional technique, graphic data as lyrics information is demodulated from a recording medium that carries graphic information in addition to video information, and the graphic data is mixed with a video signal after chromakey synthesis.

In this way, the lyrics information based on the graphic data is mixed with the video signal after chromakey synthesis, so the lyrics information does not disappear.

[Problem to be solved by the invention]

However, according to this prior art, in order to demodulate graphic data, a subcode demodulating means, a graphic data demodulating means, a mixing means for mixing graphic data, etc. are required, and the circuit configuration becomes complicated. However, since it is necessary to maintain synchronization between the graphic data and the video signal during editing during recording, the editing work becomes complicated.

[Means to solve the problem]

In order to solve the above problem, the invention according to claim 1 provides an apparatus for playing a recording medium in which a plurality of types of video sources are recorded in chronological order in field units, wherein each video source read from the recording medium is An image memory that stores signals in field units, and a video signal of the field to be currently output.
signal selection control means for outputting a video signal of a temporally previous field stored in the image memory independently of each other; and a video signal obtained by the signal selection control means that outputs a video signal obtained from a video camera. It is configured to include chroma key synthesis means for performing chroma key synthesis on either of the above.

The invention according to claim 2 is an apparatus for playing a recording medium in which a plurality of types of video sources are recorded in chronological order in units of fields, the apparatus comprising: a plurality of video sources that store video signals read from the recording medium in units of fields; an image memory; and an image selection control means for writing the read video signal into the image memory in association with the type of the video source, and outputting video signals corresponding to each video source independently of each other by reading and writing the read video signal into the image memory in association with the type of the video source. , a chromakey composition means for chromakey composition of a video signal obtained from a video camera with one of the video signals obtained by the image selection control means.

[Function] According to the invention described in claim 1, each video signal read from the recording medium is stored in the image memory in units of fields. At this time, since each video signal corresponds to each of a plurality of types of video sources, the video signals of the respective video sources are sequentially updated and stored in the image memory. This stored video signal is currently output 1. This is a video signal that temporally precedes that of the field of interest. The signal selection means independently outputs the video signal of the field to be currently output and the video signal of the field temporally previous, that is, the video signal stored in the image memory.

As a result, for example, if one of the video sources includes text information, such as a video source for karaoke, chromakey synthesis can be performed on the video signal corresponding to the video source that does not include text information. For example, karaoke can be played back without losing text information, and at the same time, it is also possible to play back other videos that have been chroma keyed.

According to the second aspect of the invention, each video signal read from the recording medium is stored in each field in each of the plurality of image memories. At this time, the image selection means distributes and writes the read video signals to each image memory for each type of video source. Therefore, each image memory stores a video signal for each video source. The stored video signals are read out independently from each other by the image selection means.

As a result, for example, if one of the video sources includes text information, such as a video source for karaoke, the video signal from a video camera, etc. can be chromakey synthesized with the video signal corresponding to the video source that does not include text information. This makes it possible to play back karaoke without damaging text information, and it also becomes possible to play back chromakey composite images.

〔Example〕

An embodiment of the recording medium playing device of the present invention will be described below with reference to the drawings.

First Embodiment In FIG. 1, a video disc 4 is rotationally driven by a motor (not shown) and a servo loop (not shown). The recorded information on this disc 4 is read by the optical pickup 1. This pickup 1 is
It has a laser diode, an actuator for converging the light beam emitted from the laser diode onto the recording surface of the disk, an actuator for controlling the radial position of the convergence point of the light beam, and the like. A servo loop is provided to drive and control various actuators of the pickup 1, but it is omitted in this figure because it is not particularly necessary for the explanation.

Read RF multiplied signal R read by pickup 1
After passing through the F amplifier 2, it is supplied to the HPE (bypass filter) 3. The HPE 3 passes only the frequency band of the video signal component in the read RF signal. The read RF multiplied signal that has passed through the HPE 3 is supplied to the FM demodulation circuit 7, where it is FM demodulated. A composite video signal (hereinafter simply referred to as a video signal) which is the demodulated output of the FM demodulation circuit 7 is supplied to an A/D converter 8 and a synchronization separation circuit 9. In the synchronization separation circuit 9, for example, a horizontal synchronization signal in the video signal is separated and extracted. This horizontal synchronization signal is supplied to the PLI circuit 10. In the PLL circuit 10, a clock whose phase is synchronized with the video signal is generated based on the horizontal synchronization signal.

The clock generated by the PLL circuit 10 is supplied to the write control circuit 11 and becomes the conversion clock of the A/D converter 8, and at the same time becomes the write clock to the line memory 12 at the next stage. The digital video signal written in the line memory 12 is read out by a read control signal from the read control circuit 14 based on the master clock of the clock oscillator 13, and then written into the image memory 15 by a write control signal from the write control circuit 16. written to a predetermined address. Read control signal RC8 of line memory 12
The write control signal WC32 and the read control signal RC32 of [I, Image Memory] 5 are all generated based on a master clock by a clock oscillator 13 whose time axis is stable. In this way, the video signal is written to the line memory ]2 based on the clock phase-synchronized with the video signal,
By reading this based on a master clock with a stable time axis, a video signal whose time axis fluctuations (jitter) have been corrected can be obtained, and this is the time axis correction process.

The image memory 15 has a storage capacity capable of storing one field's worth of video signals, and each time a video signal is read out from the line memory 12, it is sequentially written to a predetermined address in the image memory 15, and is written independently of the writing. The write control signal WC82 from the write control circuit 16 is read out sequentially.
and read control signal RC82 from read control circuit 17
By controlling the read address to be one field away from the write address, it functions as a one-field delay circuit. In this case, since the read control signal RC32 is a signal that is phase-synchronized with the reference synchronization signal of the reference synchronization signal generator 18, a video signal with discontinuous synchronization signals is written into the image memory 15 due to the track jump operation due to special playback. too,
By reading out using the readout control signal RC32 which is phase-synchronized with the reference synchronization signal, it is possible to convert into a video signal synchronized with the horizontal and vertical synchronization signals, and synchronous conversion processing is performed.

The digital video signal read out from the image memory 15 and delayed by one field is supplied to the movable contact A of the changeover switch SW1 and the movable contact a of the changeover switch SW2, and is supplied to the movable contact a of the changeover switch SW1 and the other of the changeover switches SW1 and SW2. The movable contact is supplied with a digital video signal from the line memory 12 that is not delayed by one field. The changeover switches SWI and SW2 are both configured to select the a contact or the b contact in response to a switching command signal from the switch control circuit 35. The digital video signal supplied via the changeover switch SW is sent to the D/A converter 1.
9a, the signal is converted into an analog video signal and supplied to one of the movable contacts (movable contact a) of the changeover switch SW4 and the changeover switch SW5.

On the other hand, the digital video signal supplied via the changeover switch SW2 is converted into an analog video signal by the D/A converter 19b and then supplied to the chromakey synthesis circuit 20, and the output of the chromakey synthesis circuit 20 is transferred to the changeover switch SW3. A D/A converter 19b is connected to one movable contact a of
The output is directly supplied to the other movable contact of the changeover switch SW3. The changeover switch SW3 is changed over in response to a changeover command signal from the controller 28.

The chromakey synthesis circuit 20 converts the first video (D/A converter 1
This is to insert and synthesize a region other than a specific color (for example, blue) in the second image (the image obtained by the video camera 21) into the image obtained by the output video signal of the output video signal 9b, and its configuration will be described later.

The analog video signal obtained through the changeover switch SW3 is transferred to the changeover switch SW4 and other movable contacts of SW5 (
The output of the changeover switch SW4 is outputted as the first image output, and the output of the changeover switch SW5 is outputted as the second image output. Changeover switch S
W4 and changeover switch SW5 are the switch control circuit 29
It is switched by a switching command signal from.

A control code separation circuit 23 is connected to the output of the FM demodulation circuit 7. The control code separation circuit 23 extracts the user code of a predetermined horizontal scanning pulse from the video signal and supplies it to the controller 28 . The user code is either a disk on which a normal video signal with two consecutive fields constituting one frame is recorded, or a special source disk on which two different source signals are alternately recorded for each field (hereinafter referred to as W source). (referred to as a disk). Details of this W source disk will be described later. The controller 28 is composed of a microcomputer, and generates a control signal for stopping the write control operation of the write control circuit 6 or controlling the switching of the changeover switches SW1 to SW5 according to a user code.

In addition, the output of the RF amplifier 2 includes an LPF (low pass filter) 24 and a BPF (band pass filter) 30.
．． 32 are connected. The LPF 24 passes only the frequency band of the digital signal component in the read RF signal.

Read RF multiplied signal EFM demodulation circuit 2 that has passed through LPF 24
5.

The EFM demodulation circuit 25 performs EFM demodulation processing on the pulse signal obtained by slicing the RF multiplied signal, and outputs PCM data, that is, time-division multiplexed left and right channel audio information. Digital data output from the EFM demodulation circuit 25 is converted into analog signals by D/A converters 26a and 26b, resulting in left and right channel audio signals.

BPF30 and 32 have different frequency characteristics,
Only the frequency bands of left and right channel analog audio signal components in the read RF signal are passed. BPF3
From 0, the analog audio signal component of the left channel is output and demodulated by the demodulation circuit 31. BPF30
The analog audio signal component of the right channel is outputted from and demodulated by the demodulation circuit 33.

FIG. 2 shows a specific configuration of the chromakey synthesis circuit 20. In this circuit, a video camera 21. The component video signals from the encoder 41 are converted into composite video signals and supplied to the compositing circuit 42. The component video signal includes a luminance signal Y1 and a color difference signal RY.

B-Y and synchronization signals are included. The color difference signal 13-Y signal of the component video signal is supplied to a comparator 43 and compared with a reference voltage Es.

When BY≧Es, the output level of the comparator 43 becomes high level, and when BY<Es, the output level of the comparator 43 becomes low level. The output signal of this comparator 43 is
2. The synthesis circuit 42 outputs the video signal from the D/A converter 19b when the comparator 43 outputs a high level, and outputs the video signal from the encoder 41 when the output is a low level. Therefore, if the background of the subject of the video camera 21 is set to blue, the output level of the comparator 43 will be low in the subject area, and the output level of the comparator 43 will be low in the background area.
The output level of is high. Therefore, video camera 2
1 is the image shown in Figure 3(a), and D/
The image based on the video signal from the A converter 19b is shown in Figure 3 (
In the case shown in b), the image based on the output video signal of the combining circuit 42 is such that the background of the subject becomes an image based on the video signal from the D/A converter 19b, as shown in FIG. 3(e).

On the other hand, in the W source disk described above, as shown in FIG. 4, the field of one signal source A is A t -A, .
, A , , A ......, and the fields of the other signal source B are B , B , B , , B
4..., the first field of the first frame is field A, the second field is field B, the first field of the next frame is field A, the second field is field B4, etc. It is recorded by alternately combining signal sources A and B for each field. Note that the audio signal is common to signal sources A and B.

In order to indicate that a double source disc on which a video signal has been recorded is different from a normal video disc, a user code is recorded on a predetermined horizontal scanning pulse in the video signal, and by detecting this, a double source disc can be detected. Discern.

Furthermore, when the W source disc is used as a so-called karaoke video disc, the image produced by signal source A contains lyrics information, and the image produced by signal source B does not contain lyrics information.

Next, the operation of the above embodiment will be explained.

First, it is assumed that the switches SWI to SW5 all select movable contact a when the switching command signal is at a high level, and select movable contact S when the switching command signal is at a low level.

First, we will explain the operation when a normal disc is played. The controller 28 reads the user code obtained from the control code separation circuit 23, and if it determines that the disc to be played is a regular disc, it instructs the write control circuit 16 to write to the image memory 15. Occur. On the other hand, regardless of which movable contact is selected for SWI and SW2, the fields are normally played back in the same order as recorded on the disk, so the controller 2
Reference numeral 8 indicates a changeover switch SW for the switch control circuit 35 in response to a selection command from an external operation key (not shown), for example.
A command is given to generate a switching command signal to select SW1 and SW2.

Note that when a still image command is given by an external operation key, the write control circuit 16 is controlled to prohibit writing of a new video signal to the image memory 15, and at least one of the changeover switches SWI and SW2 is set to the image memory 15. If you select the output of image memory 15
Still images obtained from can be output. For example, when writing to the image memo 15 is prohibited and the changeover switch SWI is set to the movable contact side and the changeover switch SW2 is set to the movable contact side, one video output will output a still image, and the other video output will output a still image. The video that is normally played from the disc will be output.

The video output from the changeover switch SW2 is a D/A converter],
After being analog-converted by 9b, it is supplied to a chromakey synthesis circuit 20, where the external video signal obtained from the video camera 21 is subjected to chromakey synthesis. The chromakey synthesized signal and the non-chromakey synthesized signal are respectively supplied to both rotary contacts of the changeover switch SW3, and the controller 28 selects either output according to a command from the external operation key.
Switch control.

The output of the D/A converter 19a is connected to the movable contacts a of the changeover switches SW4 and SW5, and the output from the changeover switch SW3 is connected to the movable contacts of the changeover switches SW4 and SW5. Switching is controlled by a switching command signal from the switch control circuit 29.

The selection contents of the changeover switch SW4 and changeover switch SW5 are arbitrary. For example, if the first video output and the second video output are to have exactly the same output, selector switch SW4
, SW5 can be unified to movable contact a or b,
Furthermore, when the changeover switch SW3 is switched to the movable contact a side, if SW4 is set to the a side and SW5 is set to the b side, the output image from the D/A converter 19a as the first image output is changed to the second The chromakey-combined output videos are output as image outputs.

In this way, when playing back a regular disc, the write control circuit 16! ! ili #! :Memory] 5 and an appropriate combination of changeover switches SWI to SW5, if the first and second images are both moving images, or both are still images, one of them is still. It is possible to select whether one image is a moving image or the other is a moving image, and furthermore, it is possible to embed an external image by chromakey synthesis while outputting the second image.

On the other hand, the operation when the control code separation circuit 23 detects an identification signal indicating that it is a W source disk will be described.

The controller 28 issues a write command to the image memory 15 to the write control circuit 16. The image memory 15 acts as a field delay circuit, so when the changeover switch SWI is changed over for each field, only the information of one signal source (for example, signal source A) is transferred to the changeover switch SWI.
It appears in the way I appears. If the switching of the changeover switch SW2 is performed in synchronization with the changeover of the changeover switch SW1, only the information of the other signal source (for example, signal source B) appears at the output of the changeover switch SW2.

This situation is shown in FIG. 5, in which (a) shows the signals stored in the image memory and read out in field units, and (b) shows the signals stored in the image memory and read out in field units, and (b) shows the signals stored in the image memory and read out in field units.
It shows a switching command signal given to W2. Among the outputs of the image memory 15, which are outputted as A, SB2, A3, etc. on the time axis from the left side of the figure, in the field period corresponding to signal source A, both switches select the movable contact a, and the signal Both switches b are selected in the field period corresponding to source B.

Now, focusing on the changeover switch sw1, when the changeover command signal is at a high level, movable contact a is selected and a signal that is not delayed by l field is selected, and when the changeover command signal is at a low level, movable contact A is selected and the image memory 15
Since the field-delayed signal is selected, the output image of the changeover switch sw1 includes, for example, only the field information for the signal source.

On the other hand, if we pay attention to the changeover switch sw2, we can see that the image memory 1
5, the selection between the l-field delayed signal and the non-delayed signal is complementary to the case of the changeover switch SWI, so that the output of the changeover switch SW2 includes, for example, only the field information of the signal source B. Become.

In this way, it becomes possible to individually reproduce each signal source originally included in the W source disc.

Note that when a still image is output, it is necessary to prohibit writing to the image memory, so it is impossible to restore at least one of the signal sources. Therefore, when a still image output is commanded, the respective changeover switches SW1 and 8w2 are set to select the output of the image memory 15, respectively.
Either outputs a still image from one of the signal sources, or ignores a still image request from an external operation key.

On the other hand, the changeover switch sw3 is selected depending on the user's desire to perform chroma key synthesis or not, and is switched to movable contact a when chromakey synthesis is to be performed, and to movable contact s when chromakey synthesis is not to be performed.

The changeover switch SW4 and the changeover switch SW5 are controlled by the switch control circuit 29 so as to have complementary connections. That is, in the case of a W source disc, signal source A and signal source B are output separately as outputs of the respective changeover switches.

For example, signal source 8 appears at the output of changeover switch SWI, signal source B appears at the output of changeover switch SW2, and the movable contact of changeover switch SW4 is connected to a, and the movable contact of changeover switch SW5 is connected to b. Then, the signal source A will be output to the first image output, and the signal source B will be output to the second image output. Even when chromakey synthesis is performed on the output of the second signal source B, the signal source A is output as is.

Therefore, if signal source A records a video signal that includes lyrics information, and signal source B records a video signal that does not include lyrics information, the user can record the video signal that includes lyrics information in signal source A, that is, the first image that includes lyrics information. The user can sing while viewing the information output on the monitor, and also enjoy the chromakey-combined signal source B, that is, the second image information.

Note that if a signal source containing lyrics information is recorded in the second field, selector switches SW1 and SW2 are
The switching control may be reversed from that of the above embodiment. The user can specify which field the source information recorded contains lyrics information by using an external operation key, or the controller 28 can automatically specify which field contains the lyrics information by including the discrimination information in the control code described in 7 above. The information may be given to the switch control circuit 35, and the switch control circuit 35 may give the switching timing of the changeover switches SWI, SW2 as a switching command signal in accordance with this information.

FIG. 6 shows an example of the configuration of a recording apparatus for obtaining a double source disc.

In the figure, source A and source B video signals are output from video signal sources 51 and 52 such as video tape recorders. The video signal sources 51 and 52 are configured to output source A and source B video signals in synchronization with a synchronization signal output from, for example, a synchronization signal generator (not shown).

Video signals of sources A and B output from video signal sources 51 and 52 are supplied to a video multiplexing circuit 53.

The video multiplexing circuit 53 generates a switching command signal for every other field using a synchronizing signal output from a synchronizing signal generator (not shown), and uses this switching command signal to select one of the video signals of sources A and B. It is configured to selectively output one of the two. Therefore, the output of the video multiplexing circuit 53 is a signal obtained by thinning out the video signals of sources A and B every other field and arranging them alternately.

The output of this video multiplexing circuit 53 is supplied to an FM modulator 55. The FM modulator 55 generates a video FM signal as a first modulated carrier signal in which the frequency of the carrier signal of the first predetermined frequency is modulated. This video FM signal is supplied to an adder circuit 56.

Also, an audio signal source 57 such as an audio tape recorder
An analog audio signal is output from. The audio signal output from audio signal source 57 is supplied to FM modulator 58 .

The frequency of the carrier wave signal of the second predetermined frequency is modulated in the FM modulator 58 to generate an audio FM signal. This audio FM signal is supplied to an adder circuit 56 and added to the video FM signal.

On the other hand, the audio signal source 59 generates a digital audio signal. Further, digital data signals such as graphic signals other than digital audio signals are outputted from a digital data generation source 59 such as a microcomputer. Further, the digital audio signal and digital data signal are encoded in the CD format in encoding circuits 61 and 62, respectively. Each output data of the encoding circuits 61 and 62 is supplied to a multiplexing circuit 63. The multiplexing circuit 63 is configured to output data output from either one of the encoding circuits 61 and 63 in accordance with a reference timing signal output from, for example, a timing signal generator (not shown). The output of this multiplexing circuit 63 is converted into an EFM signal as a second modulated carrier signal that is supplied to an EFM modulator 64. , EF, M modulator 64 outputs are sent to the adder circuit 6
5 and added to the output of the adder circuit 45. The output of this adder circuit 65 is supplied to a recording device 66. The recording device 166 is, for example, a well-known optical video disc recorder.
The output of
A recording track made up of bits is formed on the recording surface of the master disk, which rotates at a speed of /30 seconds).

In the above-described embodiments, a video disk player has been described as a recording medium performance device, but the present invention is not limited to this, and the present invention can be applied to other recording medium performance devices such as a VTR.

In addition, in the above embodiment, the changeover switches SWI, SW2
, SW3, and SW4, the switch control circuits 35 and 29 are used, but the switching command signal may be directly supplied from the controller 28 to each changeover switch.

Second Embodiment A second embodiment is shown in FIGS. 7 and 8. In the first embodiment, the image memory 15 is used as a delay circuit, and the current field and the image signal of the previous field stored in the image memory 15 are selectively switched to the image of the signal source A by selectively switching the switches SW1 and SW2. Monitor the signal and the video signal of signal source B independently MONI, MON
It was designed to be able to output 2 outputs. In contrast, the present embodiment uses a plurality of (two in FIG. 7) image memories that store a plurality of video signals in units of fields [5-1]
．． 15-2... are provided, and the write control circuit 16 outputs a write enable signal WEIWE2 (eighth
1! iU) out of the memory input MIN output from the line memory 12, the same type of video signal (for example,
A for A, B for B, etc.) in each image memory 15.
-1, 15-2 respectively, and write, and the read control circuit 17 independently outputs memory output M.
M. , (1, .0, 2).

The same type of video signals can be assigned, for example, by selecting even fields and odd fields. An inverter INv is used as a means for operating each image memory 15-1, 15-2 in a complementary manner with the write enable signals WEI and WF2 having opposite phases.

In such a configuration, a karaoke video source including text information is assigned as a video signal to be written to the image memory 15-1, a video source not including text information is assigned as a video signal to be written to the image memory 15-2, and If, after passing through the D/A converter 19b, the memory output M output from the image memory 15-2 is synthesized with a video signal from a video camera or the like by the chromakey synthesis circuit 20,
It is possible to play back and enjoy karaoke videos that do not lose text information and chromakey composite videos. FIG. 8 shows the writing state and output state of the above video signal.

Although the above description has been made on the assumption that a W source disc is used, the present invention can also be applied when there is a disc in which a plurality of video sources are stored divided into the same number of fields. In that case, the image memory 15-1.
15-2, . . . 15-n are provided for the number of fields (or the number of video sources), and are configured to generate and control a write enable signal corresponding to each field period.

〔Effect of the invention〕

As described above, according to the recording medium playing device of the present invention, when playing back an optical disc in which a plurality of different sources are recorded field by field, each source is played back independently, and one of the sources is played back independently. Since chromakey synthesis is now possible, for example, when used as a karaoke machine, if lyrics information is included in a source that is not chromakey synthesized, the user can sing while viewing this lyrics information on a monitor, while still being able to perform chromakey synthesis. You can enjoy the video output.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a positional embodiment of the present invention;
FIG. 2 is a block diagram showing the configuration of an embodiment of the position of the chromakey synthesis circuit, FIG. 3 is a diagram showing the chromakey synthesis operation, FIG. 4 is a diagram showing the video recording state of the W source disc, and FIG.
The diagram shows selector switches SWI and SW2 in the device shown in Figure 1.
FIG. 6 is a block diagram showing an example of the configuration of a recording device for obtaining a double source disc. FIG. 7 is a block diagram of main parts showing the second embodiment.
FIG. 8 is an explanatory diagram of the operation. 1...Pickup, 15...Image memory, SW1
~SW5... Changeover switch, 20... Chromakey synthesis circuit, 21... Video camera, 28... Controller. Applicant Yasushi Ishikawa No. 3 Figure 74 → Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. An apparatus for playing a recording medium in which a plurality of types of video sources are recorded chronologically in field units, the image storing each video signal read from the recording medium in field units. a memory; a signal selection control means for independently outputting a video signal of a field to be currently output and a video signal of a temporally previous field stored in the image memory; and an image obtained from a video camera. 2. A recording medium performance device comprising: chromakey synthesis means for chromakey synthesis of a signal with any of the video signals obtained by the signal selection control means. 2. A device for playing a recording medium in which a plurality of types of video sources are recorded chronologically in field units, comprising: a plurality of image memories that store video signals read from the recording medium in field units; and the reading device. image selection control means for writing and reading video signals corresponding to the video source types into the image memory and outputting video signals corresponding to each video source independently of each other; 1. A recording medium performance device comprising: chromakey synthesis means for chromakey synthesis of a video signal with any of the video signals obtained by the image selection control means.