JP3037581B2 - Video 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 reproducing apparatus suitably used for a compact disk graphic reproducing apparatus and the like.

[0002]

2. Description of the Related Art A compact disk (hereinafter abbreviated as "CD") is a recording medium in which an analog sound signal is converted into a digital signal and recorded on a disk having a diameter of 12 cm. CDs include not only those that record sound such as music, but also CD graphics (Compact Disc Graphics; hereinafter abbreviated as “CDG”) in which video is recorded simultaneously with sound. In the CDG, sound and video corresponding to the sound are recorded simultaneously. For example, the CDG is used for karaoke or the like in which music and a video including a still image and lyrics that sequentially change according to the music are simultaneously output, and the operator sings to the music while watching the lyrics.

[0003] In the CDG, a video signal constituting one screen of video is digitally modulated and divided, and stored in a subcode of a unit called a plurality of frames.
Similarly, the audio signal is digitally modulated and stored in the data area of the unit. In the CDG reproducing device, the audio data is read out from the data area, digitally / analog-converted sequentially, and the sound is reproduced and output. At the same time, the video data in the subcode is read out, digital-to-analog converted, sequentially stored in a memory, and a video signal for one screen is reconstructed from a large number of video data. Play back and display on display.

[0004] For example, in a CDG or the like used for karaoke, a video is divided into a still image of a background displayed for a relatively long time and a lyric portion that changes sequentially, and the video signal of each video is changed over time. They are stored sequentially. For example, a video signal of a still image is digitally modulated and divided, and stored in sub-codes of many units in which sound output for about 30 seconds has been stored. In a CDG used for karaoke, video data of the still image serving as a background is sequentially stored from the start of music, and video data of lyrics is sequentially stored after the video data of the still image is stored.

[0005]

In a CDG reproducing apparatus used for karaoke or the like, a state in which only sound is reproduced, and
In some cases, it is possible to arbitrarily select a state in which video and sound are simultaneously reproduced. The two states can be switched, for example, by switching a switch.

[0006] In a recording medium, an audio signal of a sound as one music and a video signal of a video attached to the music are digitally modulated and stored in a number of units. When the switch is switched from a state in which only the sound that is the song is reproduced to a state in which the sound and the video attached thereto are reproduced, the video signal of the video is instructed to reproduce the video. At this point, the plurality of units are read from the middle of a group formed by sequentially arranging the units in time.

A video signal is digitally modulated, divided into a plurality of video data, and stored sequentially from the head unit of the group. If video data is read from a unit at an arbitrary position in this group and an attempt is made to reproduce the video, the video data stored before the arbitrary time cannot be obtained. Therefore, the video signal reconstructed from the read video data is a signal lacking the video data stored before the arbitrary time. As a result, for example, in the case of the above-mentioned karaoke, there is a problem that a part of the still image is missing, or the background still image is not displayed, and a distorted screen is displayed such that only the lyrics part is displayed.

When fast-forwarding and rewinding operations are performed while video and sound are being reproduced simultaneously, video data can only be obtained in an incomplete form in the fast-forwarding and rewinding sections. There is a problem. In the CD, fast-forwarding for increasing the relative reading speed between the recording medium and the reading means is performed by skipping the units sequentially arranged in the reading direction at regular intervals and reading the data, thereby shortening the reading time. Further, fast-return, in which the reading means is returned in the direction opposite to the reading direction of the recording medium, is also executed by skipping the unit at regular intervals in the direction opposite to the reading direction and reading.

As described above, a video signal is obtained by reconstructing video data sequentially stored in a continuous unit. Therefore, when fast forward and fast reverse are executed, only a part of video data necessary for video reproduction is obtained. And cannot reproduce a complete video.

It is an object of the present invention to provide a video reproducing apparatus capable of preventing a video from being disturbed.

[0011]

According to the present invention, for each of a plurality of groups, a plurality of video data which are a part of a video signal for one screen, and a position indicating a recording position of each of the video data in each group. A recording medium on which data is recorded along a track, reading means for relatively moving along the track of the recording medium to read the video data and the position data, and a display for displaying a video Means,
Control means for reproducing a video of each group from the video data in response to an output from the reading means and displaying the video data on the display means, wherein a command signal for instructing a start of reading the video data is provided. A command signal output circuit that outputs the command signal, and responds to the output from the reading unit and the command signal output circuit, upon receiving the command signal,
Determining means for determining whether the recording position of the video data indicated by the position data read by the reading means is the first recording position of the group to which the read position data belongs; and responding to the output of the determining means, When the recording position indicated by the position data read by the reading means at the time of receiving the command signal is the first recording position of the video data of the group to which the position data belongs, the reading of the video data by the reading means is continued and the reading is continued. When the recording position is not the recording position of the head of the video data of the group, the recording medium and the reading means are relatively moved to the track so that the video data can be read from the head of one group. Along with at least the first video data and the subsequent video data of the group. The reading, the control means,
Reading position control means for displaying at least one screen image on the display means, wherein the control means performs relative reading between the recording medium and the reading means while the image is displayed on the display means. An image reproducing apparatus characterized in that fast-forwarding for increasing the speed and fast-returning of the reading means in a direction opposite to the reading direction of the recording medium are prohibited. Also, in the present invention, the reading position control means reads and reproduces at least the first video data and the following video data recorded in a group to which the position data read by the reading means belongs upon receiving the command signal. It is characterized by. Further, in the present invention, the reading position control means may include at least the first video data of the next group adjacent to the downstream side in the reading direction along the track of the group to which the position data read by the reading means at the time of receiving the command signal; It is characterized by reading and reproducing video data subsequent thereto. Further, in the present invention, a plurality of units are arranged along a track on the recording medium, and in each unit, the video data and position data indicating a position in a group to which the unit belongs are read by a reading unit. Sequentially arranged along the track reading direction, the video reproducing device sequentially stores video data for each group, and sequentially reads video data stored in the memory, And a display control means for visually displaying the display means. The present invention also provides
A sound data is also stored in each of the units, and the reading means further includes sounding means for reading the sound data and sounding and outputting the sound data in response to an output from the reading means. It is characterized by.
Further, the present invention, in response to the output from the command signal output circuit and the reading means, from the time of receiving the command signal, until at least the first video data of the group is read and reproduced immediately before the display. The apparatus further includes a video mute means for stopping the display of the video by the means. Further, according to the present invention, a plurality of units are arranged along a track, and each unit includes video data which is a part of a video signal for one screen of each of a plurality of groups and a position in the group to which the unit belongs. A recording medium on which the position data and the audio data are sequentially recorded in the reading direction of the track by the track reading means, and move relatively along the track of the recording medium to obtain video data, position data and audio data. A read unit for reading data, a display unit for displaying an image, and a control unit for responding to an output from the read unit, reproducing the image of each of the groups from the image data, and displaying the image on the display unit. An operation switch serving as a command signal source for outputting a command signal for instructing a start of reading of the video data; In response to the output from the means and the operation switch, the recording position of the video data represented by the position data read by the reading means when the command signal is received is the head recording position of the group to which the read position data belongs. Determining means for determining whether or not the recording position indicated by the position data read by the reading means at the time of receiving the command signal in response to the output of the determining means is the first recording position of the video data of the group to which the position data belongs. In some cases, the reading of the video data by the reading means is continued, and when the read recording position is not the first recording position of the video data of the group, 1
The recording medium and the reading means are relatively moved along the track so that the video data can be read from the head of one group, and the video data at least at the head of the group and the video data subsequent thereto are read. Reading position control means for displaying at least one image on the display means by the control means, a memory for sequentially storing video data for each group, and sequentially storing the video data stored in the memory. Display control means for readout and visual display on the display means, acoustic means for sonicating and outputting the acoustic data in response to the output of the reading means, output from the operation switch and the reading means In response to the command signal, at least the first video data of the group is read and reproduced from the time when the command signal is received. A video mute means for stopping display of a video by a display means until immediately before, wherein the control means controls a relative reading speed between the recording medium and the reading means while the video is displayed on the display means. And a fast-return that returns the reading unit to the direction opposite to the reading direction of the recording medium is prohibited. In the present invention, a plurality of units are arranged along a track, and each unit includes:
A recording medium on which audio data, position data indicating a position of the unit in a group to which the unit belongs, and video data which is a part of a video signal for one screen are recorded along a track of the recording medium; , Reading means for sequentially reading the unit, sounding means for sounding and outputting the sound data of the read unit in response to an output from the reading means, and a unit read by the reading means A memory for sequentially storing video data, and display means for displaying video,
Display control means for sequentially reading the video data stored in the memory, sequentially reconstructing a video signal for one screen from the video data of the plurality of units, and visually displaying the video on the display means, A command signal output circuit for outputting a command signal for instructing the start of reading of video data in a reproduced state, and responding to an output from the reading means and an output from the command signal output circuit; Determining means for determining whether or not the position indicated by the position data of the unit read by the unit is the head position of the group to which the read unit belongs; and responding to the output of the determining means; If the position of the read unit is the head position of the group, reading of the unit by the reading means is continued, and the image data of the read unit is read. (2) When the position of the unit read at the time of receiving the command signal is not the head position of the group, the reading unit continues reading the unit, and the unit at the head position of the group is read. After that, the read position control means for sequentially storing the read image data of the unit in the memory, and the output from the command signal output circuit and the output from the read means are responded to one screen from the time when the command signal is received. Until the point at which the video signal is reproduced and displayed, the video signal includes a video muting unit that stops displaying the video on the display unit.
A video reproducing apparatus characterized by continuously reproducing sound. Further, according to the present invention, a plurality of units are arranged along a track, and each unit has audio data, position data indicating the position of the unit in a group to which the unit belongs, and a video signal of one screen. A recording medium on which a portion of video data is recorded, reading means for relatively moving along a track of the recording medium to sequentially read the units, and reading means in response to an output from the reading means; Sounding means for sounding and outputting the sound data of the unit, and a memory for sequentially storing the image data of the unit read by the reading means,
Display means for displaying an image, and sequentially reading the image data stored in the memory, sequentially reconstructing a video signal for one screen from the image data of the plurality of units,
Display control means for visually displaying an image on a display means, a command signal output circuit for outputting a command signal for instructing start of reading of video data when only sound is reproduced, output from the reading means and a command signal Determining means for responding to the output from the output circuit and determining whether the position indicated by the position data of the unit read by the reading means at the time of receiving the command signal is the head position of the group to which the read unit belongs; (1) When the position of the unit read at the time of receiving the command signal is the head position of the group, the reading of the unit by the reading unit is continued, and the read image data of the unit is stored in the memory. (2) If the position of the unit read at the time of receiving the command signal is not the head position of the group, After relatively moving the reading position of the reading means relative to the recording medium to the head position of the group in the medium, the units are sequentially read by the reading means from the moved reading position, and the read image data of the unit is read. Reading position control means for sequentially storing the image data in the memory, after all the image data for reconstructing the image signal for one screen are stored in the memory at least, the image signal is reconstructed and the image is reproduced, A video reproducing apparatus characterized in that acoustic data read at the same time as data reading is sequentially converted to acoustic data. In addition, according to the present invention, when the video playback device is mounted on a vehicle, the command signal output circuit further includes a switch for operating a power-energized state, and the sounding unit and the reading unit are connected to a vehicle. Through the accessory switch,
Power is energized from the power supply of the vehicle, the memory, the display control means and the display means, via an accessory switch of the vehicle and a switch of the command signal output circuit,
It is characterized by being energized by a power supply of the vehicle.

[0012]

According to the present invention, the recording medium stores video data, which is data obtained by dividing the video signal of the video and which constitutes the video of each of the plurality of groups, at the recording position in each group of the video data. Is recorded along the track of the recording medium together with the position data representing In the video reproducing apparatus, the reading unit is relatively moved along the track of the recording medium to read the video data and the position data from the recording medium, and the group of the video data is read from each of the plurality of read video data. And reconstructs the video signal and displays it on the display means.

In the video reproducing apparatus, when a command signal notifying the start of reading of the video signal is output from the command signal output circuit, the position data of the video data currently read by the reading means is determined by the determining means. It is determined whether or not indicates the head position of the group to which. If so, the reading of the video data is continued. When the recording position indicated by the position data is not the first recording position of the group, the reading position control means moves the reading position of the reading means along the track relative to the recording medium. First, at least the first video data and the subsequent video data of one group are read and the video is reproduced.

Thus, in the state where only the data other than the video is reproduced, the reproducing apparatus always starts reading the video data when the reading of the video data is instructed when the reading of the data is completed halfway through the group. Video data can be read from. Further, the reading means fast-forwards the reading speed between the recording medium and the reading means relatively fast while the image data is read and the image is displayed on the display means, and the reading means reads the recording medium in the reading direction. Reverse fast return, which is opposite to the above, is prohibited. Thus, during video reproduction, fast forward and fast rewind for reading a large number of units in the group at regular intervals are not performed, so that the video data can always be read without missing. Therefore, it is possible to prevent image disturbance caused by incomplete video data.

According to the present invention, when the read position control means receives the command signal, at least the first video data recorded in the group to which the read position data read by the read means belongs, The video data is read and reproduced. Alternatively, at least the first video data and the subsequent video data of the next group adjacent on the downstream side in the reading direction along the track of the group to which the position data belongs are read and reproduced. Thus, the playback device can read the video data from the head of the group closest to the recording position that was being read when the reading of the video data was instructed.

Further, in the present invention, the group is:
Consists of multiple units. In each unit, the video data and position data indicating a position in the group to which the unit belongs are sequentially arranged and stored in the track reading direction. The control means sequentially stores the video data read by the reading means in a memory for each group, and the display control means sequentially reads the video data stored in the memory and visually displays it on a display means. . Thus, a series of video data formed by dividing a video signal of one screen and sequentially stored in a number of units arranged in the reading direction of the recording medium can be read without missing. Therefore, it is possible to prevent the image reproduced from the video data from being disturbed.

According to the present invention, acoustic data is also stored in each unit of the recording medium. The reading means of the video reproducing apparatus reads the audio data simultaneously with the video data and the position data, and audibly converts the audio data by the audio means provided in the apparatus and outputs the sound data. Thereby, sound can be reproduced simultaneously with the video stored in the recording medium.

Still further, according to the present invention, the video mute means provided in the video reproducing apparatus may be configured to read at least video data from an arbitrary position in the group by the reading means, and then at least output the video data from the next group of the group. Until the first video data is read and reproduced, the display means stops displaying the reproduced video. Thereby, when the video data is read from the middle of the group and the reproduced video signal is incomplete, it is possible to prevent a disturbed image generated due to the incomplete video signal from being displayed on the display means. .

Further, according to the present invention, in the video reproducing apparatus, when a command signal for instructing the start of reading of video data is output in a situation where only sound is reproduced, reading of the unit is continued and the head of the group is read. The video data is stored in the memory from the time when the unit at the position is read. The video display is stopped until the video signal for one screen is reproduced and can be displayed. The sound continues to be reproduced even while the video display is stopped. This prevents the display of an incompletely distorted image when switching from a state in which only sound is reproduced to a state in which both sound and video are reproduced. Further, according to the present invention, when a command signal for commanding to start reading of video data is output in a situation where only sound is being reproduced, if the reading position of the reading means is not at the group top position, Then, the unit starts reading after the reading position is relatively moved to the group head position. After all video data for reconstructing the video signal for one screen is stored in the memory, the video signal is reconstructed and the video is reproduced. At the same time, the audio data read simultaneously with the reading of the video data is sequentially converted into audio. This prevents the display of an incompletely distorted image when switching from a state in which only sound is reproduced to a state in which both sound and video are reproduced. According to the present invention, when the video playback device is mounted on a vehicle, the memory, the display control unit, and the display unit are connected to a power supply via not only an accessory switch of the vehicle but also a switch included in a command signal output circuit. Power is energized. by this,
The generation of noise in other audio equipment connected to the power supply of the vehicle due to the high-frequency video signal flowing through the memory, the display control means, and the display means is prevented.

[0020]

FIG. 1 shows a CDG including a video reproducing apparatus according to the present invention.
FIG. 2 is a block diagram showing a simplified electrical configuration of the playback device 1. The CDG reproducing device 1 has a sound reproducing unit 2 which is sound converting means for reproducing sound from sound data. The video reproduction unit 3 reproduces a video from video data and displays the video. The processing unit 4 controls the reproduction operation of the audio reproduction unit 2 and the video reproduction unit 3 in response to the output from the reading unit 5.

The CDG reproducing apparatus 1 of this embodiment is used, for example, mounted on an automobile or the like, and is powered by a power source 6 via an accessory switch 7. The video reproducing unit 3 is independently powered by a power source 6 via an accessory switch 7 and a karaoke switch 8. Therefore, what is energized only through the accessory switch 7 is the audio reproducing unit 2, the processing unit 4, and the reading unit 5 in the reproducing device 1. A high-frequency signal, for example, a video signal flows through the circuit of the video reproducing unit 3. The video playback unit 3 is independently energized by this high-frequency signal because other audio equipment, such as a radio, which is attached to the car on which the playback apparatus 1 is mounted and connected to the same power supply 6 This is to prevent noise from being generated on the TV and the television. The power supply 6 includes, in addition to the playback device 1,
For example, the ignition circuit 9 of the internal combustion engine 10 is also connected.

The CDG reproducing apparatus 1 shown in FIG. 1 reads a CDG 16 which is a recording medium by a reading means 5 to reproduce and output stored sound, and at the same time, a video reproducing section 2.
, A video stored together with sound, such as a display screen 11 shown in FIG. 2, is reproduced and displayed. For example, CDG1
When the sound and the video stored in 6 are used for karaoke, the video includes, for example, a background 12, which is a still image displayed for a relatively long time, and lyrics that change in a short time as the sound progresses. And a part 13.

As shown in FIG. 3, tracks 17 are formed spirally on one surface of the CDG 16, and along the tracks 17, a large number of units 18, also called frames, are sequentially stored. FIG. 4 is a diagram showing the track 17 of FIG. 3 in a straight line. In the track 17, the units 18 are sequentially arranged and stored in a track reading direction, for example, a direction from the left to the right in FIG.

As shown in FIG. 5, the unit 18 includes, in addition to audio data 21 which is audio data, a parity 22,
And the subcode 23 and the like. Parity 22 indicates that a signal read or reproduced from the CDG 16 is lost or an error occurs due to a scratch on the surface of the CDG 16, a stain such as a fingerprint attached to the surface, or deformation of the surface during handling of the CDG 16. And an error correction signal for correcting the signal. Subcode 2
Reference numeral 3 denotes a data area for storing data other than the sound, for example, data related to the sound, together with the sound stored as the sound data 21.

The subcode 23 includes P, Q, R,
Eight channels of S, T, U, V, and W are set. When the sound stored as the sound data is music, a signal indicating the start position of one piece of music is stored in the P channel. That is, in the P channel, a group, which is a set of a plurality of units 18, in which the unit 18 can reconstruct data stored in each unit 18 to form one coherent signal,
For example, in the case of music, data indicating whether or not it is the first unit 18 of the group 25 which is a set of a plurality of units 18 that can constitute the sound of one song is stored.

The Q channel indicates the number of audio channels, the presence / absence of emphasis, the music number, the index, the position data indicating the time position of the unit 18 in the music, and the time position of the unit 18 in the disc. Data is stored.

The song number indicates the number of the group to which the unit 18 belongs, that is, the group 25 from the first group 25 stored in the CDG 16. The index is one group 25
Is divided into a maximum of 99 regions, and which region of the divided many regions the unit 18 belongs to is shown. The time position of the unit 18 in the music is the unit 18
Is the unit 1 from the head unit 18 of the group 25 to which the unit 18 belongs.
8 is shown. That is, it indicates the time since the song was output. The time position of the unit 18 in the disk means that the unit 18 is the unit 18 minutes and seconds from the head unit 18 in the first group of the disk, that is, the unit 18 is stored in the CDG 16. Indicates the absolute time code indicating the cumulative time from the beginning of the first group of all the groups.

Data is not stored in the R to W channels of a CD in which only sound is stored. CD
In G16, video data obtained by digitally modulating and dividing the video signal is stored in this channel. The amount of video data stored in one unit 18 is equivalent to a video signal indicating one dot on the display screen.

Referring again to FIG. 1, in the reading means 5,
CDG1 rotated by driving means 31 such as a motor
6 unit 18 stored on the surface
Read by 0. The optical pickup 30 is moved by the driving means 31 in the radial direction of the CDG 16 as will be described later, and reads the unit 18 along the track 17 spirally formed on the surface of the CDG 16.

The read data is digital / analog (hereinafter, referred to as “digital / analog”) after error correction of the read data is performed.
In the conversion means 32, the digital signal is converted into an analog signal. Of the converted data, the acoustic data 21 is sequentially amplified by the amplifier 33,
The sound is output from the speaker 34 as sound.

The data read by the optical pickup 30 is given to a CDG decoder 36 of the video reproducing unit 3.
The CDG decoder 36 includes, for example, a D / A conversion circuit, and extracts video data from the subcode 23 of the unit 18 and sequentially stores the video data in the memory 37. Furthermore, the data read by the optical pickup 30 is given to the processing means 4. The processing unit 4 includes a control unit 41, a reading position control unit 42, a determination unit 43, a video muting unit 44, and the like, which will be described later. The D / A conversion unit 32 of the audio reproduction unit 2 and the video reproduction unit 3 It controls the CDG decoder 36.

As shown in FIG. 6, in the memory 37, for example, a large number of video data corresponding to one piece of music form one group 25 and are sequentially stored. In one group 25, a plurality of data sets exist. For example, when the video data of the video shown in FIG. 2 described above is stored in the group 25a shown in FIG. 6, the group 25a stores the background video data 26a which is a series of video data constituting the video signal of the background 12. (Collectively, "background video data 26") and lyric video data 27a, which is video data of the lyric portion 13 shown in FIG.
(Collectively, "lyric video data 27")
Each is stored. The background video data 26 and the lyric video data 27 constitute a series of video data that constitute a video signal of one screen.

The video data belonging to the background video data 26 is sequentially stored, for example, from the head of the group. Lyric image data 27 is sequentially stored in the unit 18 at a position following the unit 18 having the subcode in which the image data of the background image data 26 is stored, and in the subcode 23 of the unit 18 subsequent thereto. That is, 1
A large number of video data belonging to one group 25 are stored in the subcode 23 of the unit 18 located at the head of the group 25 and the subsequent unit 18. The optical pickup 30 of the reading means 5 reads these units 18 sequentially, and reads the read data from the CDG decoder 3.
Give to 6. The CDG decoder 36 extracts video data from sequentially supplied data and sequentially stores the video data in the memory 37.

A large number of video data stored in the memory 37 are sequentially read by the CDG decoder 36, and a video signal of the background 12 is demodulated from the background video data 26 composed of a large number of video data. . Similarly, the video signal of the lyric part 13 is demodulated from the lyric video data 27 composed of a large number of video data. The demodulated video signal is supplied to the display control means 38, and the video is reproduced from the video signal and displayed on the display means 39.

The D / A conversion means 32 of the audio reproduction unit 2 and the CDG decoder 36 of the video reproduction unit 3 are controlled by the processing unit 4, respectively. The processing unit 4 performs D / A based on data read by the optical pickup 30 or the like.
By controlling the conversion means 32 and the CDG decoder 36,
Play and output audio and video.

The CDG reproducing apparatus shown in FIG. 1 can reproduce sound from the data read from the CDG 16 by the reading means 5 in the sound reproducing unit 2 and simultaneously reproduce and output a video in the video reproducing unit 3. In addition, the reproducing device 1 can reproduce only sound. In addition, it is possible to switch from a state in which only sound is reproduced to a state in which sound and video are reproduced at the same time. The switching is performed, for example, by turning on a karaoke switch 8 which is a power switch of the video reproduction unit 3 during reproduction of sound. The karaoke switch 8 is an operation switch of a command signal source that outputs a command signal for commanding to start reading of a video signal.

FIG. 7 is a flowchart for explaining a state switching operation in the CDG reproducing apparatus 1 of FIG. 1 for switching between a CD reproducing state in which only sound is reproduced and a karaoke state in which sound and video are reproduced simultaneously. It is. The C
In the DG reproducing apparatus, when switching from the CD reproducing state to the karaoke state, the unit 18 which is currently reading,
A series of images constituting one screen, such as a track down that returns the reading position of the unit 18 in the direction opposite to the reading direction, or a track up that advances in the same direction as the reading direction, such as the head unit 18 of one group. The data is moved to the head unit 18 where the data is stored.
The reading means 5 reads the data stored in the unit 18 and the unit 18 following the unit 18.

The process proceeds from step a1 to step a2, where the processing means 4 determines that the current state is the CD reproduction state. In this state, when the operator operates the karaoke switch (which may be abbreviated as “SW” in FIG. 1) 8 shown in FIG. 1 to turn it on, the video reproducing unit 3 is energized. Step a when the karaoke switch 8 is turned on
Proceeding to 4, the processing means 4 senses that the video reproducing unit 3 is energized and the state is switched from the CD reproducing state to the karaoke state.

Subsequently, the flow advances to step a5, where the judgment means 43
When the karaoke switch 8 is turned on, the unit 18 of the CDG 16 read by the optical pickup 30
The position data stored in the sub-code 23, that is, the temporal position in the group to which the unit 18 belongs is the head position of the group 25 in which the video data for one screen of the group 25 is stored. Is determined.

The unit 18 is used for the background video data 25
In the case of the first unit 18 storing the video data, the reading of the video data is continued as it is. Otherwise, a track down command is output from the reading position control means. The track down command is issued by moving the optical pickup 30 in the direction of arrow 47 in FIG.
6 is a command to move in the radial direction and in the direction opposite to the reading direction of the unit 18. As a result, the optical pickup 30 can be moved to a position at which the unit 18 located at the head of the portion where a series of video data for one screen of the group is recorded is read. The movement amount of the optical pickup 30 can be calculated from data stored in the P channel and the Q channel in the subcode 23 of the unit 18. Further, a track-up command for moving the optical pickup 30 in the direction of the arrow 48 in FIG. 3, that is, in the radial direction of the CDG 16 and along the reading direction of the unit 18 may be output.

When the track down command is output, the flow advances to step a6 to execute track down for moving the optical pickup 30 in the radial direction. Thus, the optical pickup 30 can be moved to a position where the unit 18 in which the head video data of the background video data 26 of the group 25 is stored is read.

The process proceeds from step a6 to step a7, where the units 18 are sequentially read from the head unit 18 of the group 25, and the read video data is sequentially stored in the memory 37. For example, when all video data for one screen is stored in the memory 37, the video data is sequentially read from the memory 37 to reconstruct a video signal, reproduce the video, and display the video on the display device 39. At the same time as reading the video data, the audio data 21 is sequentially read, and the audio signal is sequentially reproduced and output from the speaker 34 as sound.

The process proceeds from step a7 to step a8. When it is detected that the operator has switched the karaoke switch 8 from the ON state to the OFF state, the process returns to step a2, and the processing means 4 switches the state from the karaoke state to the CD reproduction state. . Thus, when the state is switched from the CD reproduction state to the karaoke state, the reading means 5 always starts reading from the head data of the video data. As a result, on the display screen 11 of the display means 39, an image for one screen including the background 12 and the lyrics portion 13 is always displayed without missing. Therefore, when the state is switched from the CD reproduction state to the karaoke state in the middle of a song, for example, video data is read from the middle of the group, and the display means 39 is prevented from displaying a distorted video in which a part of the video is missing. be able to.

Processing means 4 of CDG reproducing apparatus 1 of this embodiment
Is provided with a video mute means 44. The video mute means 44 starts displaying the disturbed image on the display means 39, for example, starts reading video data from the middle unit 18 of the group, and reconstructs the video reconstructed from the read video data stored in the memory 37. When the signal becomes an incomplete signal and a missing image is displayed on the display screen 11 of the display means 39, the group next to the group to which the unit 18 currently being read belongs, that is, the downstream side in the reading direction along the track. The unit 18 located at the head of the adjacent group and the unit 18 subsequent thereto are read, the video data read from the unit 18 is reconstructed, and the obtained video signal is displayed on the display means 39 via the display control means 38. Until the image mute is performed, the image is muted so that no image is displayed on the display means 39.

FIG. 8 is a flowchart for explaining a video mute operation for performing the above-described video mute. Proceeding from step b1 to step b2, the processing means 4
Recognizes that the CDG playback device 1 is in the CD playback state. Proceeding from step b2 to step b3, the operator switches the karaoke switch 8 to the ON state, and when the video reproducing unit 3 is energized, the process proceeds to step b4. In step b4, the processing unit 43 recognizes that the state has been switched from the CD reproduction state to the karaoke state.

The process proceeds from step b4 to step b5, and the judging means 43 judges whether or not the unit 18 currently read by the optical pickup 30 of the reading means 5 is located at the head of the group 25. If so, the reading of the video data is continued, and the video is reproduced and displayed on the display means 39. If not,
At the same time as the reading of the unit 18 is continued, the above-described video muting is performed by the video muting means 44. Therefore, while the video mute is being performed, for example, although the sound is continuously reproduced, the video corresponding to the sound is not displayed on the display screen. At this time, the display screen may display an image that does not correspond to sound, for example, a blue background image in which the entire display screen is a blue image.

The process proceeds from step b5 to step b6, where the unit 18 reading by the optical pick-up 30
Group 25 to which target unit 18 determined in 4 belongs
Then, it is determined whether or not the head unit 18 of the next group 25 has been reached and all of the sound data and the like read so far have been reproduced. When the reproduction ends, the process proceeds to step b7.

In step b7, the audio data and the video data are sequentially read from the head unit 18 of the next group, the video data is sequentially stored, and the video data for one screen is read. The video signal is reproduced, and it is detected that the video signal can be displayed on the display screen. When the state is detected, the video mute is released. Proceed from step b7 to step b8,
When it is detected that the operator has switched the karaoke switch 8 to the off state, the flow returns to step b2 to return to the CD reproduction state.

As a result, for example, video data is read from the middle of a group, and a video signal reproduced from the read video data is incomplete and an incomplete disorder such that a part of the screen is missing is obtained. It is possible to prevent an image from being displayed on the display screen.

[0050]

In a CD for reproducing sound, fast forward or fast reverse can be performed while outputting sound. For example, in order to perform fast-forwarding while making a sound, the relative reading speed between the CDG 16 and the optical pickup 30 of the reading means 5 is increased, and the units 18 on the track are arranged at regular intervals, for example, one unit every several units. 18 is read, and a sound is reproduced and output from the read sound data. To perform fast rewind while making a sound, the reading speed is increased, the CDG 16 and the optical pickup 30 are moved in a direction opposite to the track reading direction, and the unit 18 is read at regular intervals to read the acoustic data. .

In the CDG reproducing apparatus, when such fast forward and fast reverse are performed during video reproduction, the video signal is digitally modulated and divided, and the video signal stored in a large number of units 18 arranged along the track is obtained. Will be read step by step. That is, the video data is partially read and stored. Therefore, a complete video signal cannot be reconstructed from the read video data, and a normal video without any disturbance cannot be reproduced. In the present embodiment, fast-forward and fast-reverse operations are prohibited in the karaoke state in which video and sound are reproduced simultaneously.

FIG. 9 is a flowchart for explaining a prohibition operation for prohibiting fast-forward or fast-return in the karaoke state.

The process proceeds from step c1 to step c2, where the processing means 4 recognizes that the CDG reproducing device 1 is in a CD reproducing state. Proceeding from step c2 to step c3, the operator switches the karaoke switch 8 to the ON state,
When the sound reproducing unit 2 detects that the power is energized, the process proceeds to step c4. In step c4, the processing means 4
It recognizes that the state has been switched from the reproduction state to the karaoke state.

The process proceeds from step c4 to step c5, and the control means 41 inhibits the above-mentioned fast-forward operation and fast-return operation. For example, when the operator performs a fast-forward operation or a fast-reverse operation, the process proceeds from step c5 to step c6.
, The operation is not accepted, and fast forward and fast reverse are not performed. Therefore, the optical pickup 30 always has the CDG
The reading speed is kept constant relative to the
Are sequentially read along the track 17.

The process proceeds from step c6 to step c7. When it is detected that the operator has switched the karaoke switch to the off state, the process proceeds to step c8. In step c8, the state is switched from the karaoke state to the CD reproduction state, and the prohibition of the fast-forward and fast-return operations is released. In the CD playback state, when the operator performs a fast forward operation or a fast reverse operation,
Proceeding from step c8 to step c9, the operation is accepted, and fast forward or fast reverse is executed.

By the above operation, in the karaoke state where the video and the sound are reproduced simultaneously, the fast forward and the fast reverse are prohibited. As a result, the optical pickup 30 always reads the units 18 continuously reproduced along the track at a constant speed and continuously reads the units 18 continuously.
The video data stored divided into eight pieces can be sequentially read. Therefore, since the video data is not lost, a normal video signal can be reconstructed from the read video data, and a good video having no missing portion can be reproduced and displayed on the display means.

Further, as shown in FIG. 8, when the video signal reconstructed from the video data is incomplete, the video data is sequentially read from the head unit 18 of the next group to reconstruct the video signal. In the case where the video mute is performed until the video is displayed on the display means, a series of video data 26b1 and 27b1 in which video data is sequentially stored from the head unit 18 of the group in one group as described above. Then, when another series of video data 26b2 and 27b2 exists, the video mute is performed when the video signal reconstructed from the video data of the second video data 26b2 and 27b2 can be displayed on the display means 39. May be canceled.

[0059]

As described above, according to the present invention, in a recording medium having a plurality of units arranged along a track, each unit has a plurality of video data constituting each group of video, Position data indicating the position in the group to which the unit belongs is stored. The video reproducing apparatus of the present invention reads this recording medium by the reading means, reproduces a video from the plurality of video data, and displays the video on the display means.

When a command signal for reading the video data and the position data is output, the recording medium and the reading means are moved relative to each other so that the reading means can always read the video data sequentially from the head of one group. Is moved along the track in the reading direction or back to the reading direction. Thus, after receiving the command signal, the reading means sequentially reads the video data from the head of the group to which the unit read immediately before the reception belongs or the head video data of the next group and stores the video data in the memory. The display control means sequentially reads the video data stored in the memory, demodulates a video signal from the plurality of video data, reproduces a video from the video signal, and visually displays the video on the display means.

As described above, even when an instruction to read video data is issued while data other than video data stored at an arbitrary recording position in the group is being read, the data reading position is always moved to the head of the group. . Therefore,
Since the video data can be read without missing from the head of the group, the disturbance of the video visually displayed on the display screen can be prevented. While reading video data, fast-forward and fast-reverse reading of group units at regular intervals are prohibited. Therefore, the video data sequentially stored along the track can be read without missing. Therefore, the disturbance of the image can be further prevented.

According to the present invention, sound data is also stored in each unit. The reading means can also read audio data simultaneously with the video data and the position data, and output the read audio data. Therefore, video and sound can be reproduced simultaneously.

According to the present invention, when reading of video data is instructed from an arbitrary position in the group, at least the first video data of the group is read and reproduced by the reading means from the start of reading. Until immediately before, no image is displayed on the display means. Thus, it is possible to prevent incomplete video data from being reproduced and displaying a disturbed video on the display unit.

Further, according to the present invention, when a command signal for instructing start of reading of video data is output in a CD reproducing state in which only sound is reproduced,
The reading of the unit is continued, and the video data is stored in the memory from the time when the unit at the head of the group is read. Until the video signal for one screen is reproduced and can be displayed, the video display is stopped, and the acoustic data read while the video display is stopped continues to be converted to sound. by this,
When switching from the CD playback state to the karaoke state in which both sound and video are played, incomplete disturbed image display is prevented. Further, according to the present invention, the video playback device
When a command signal for instructing the start of reading of video data is output in the CD reproducing state, the reading position of the reading means is relatively moved to the head position of the group, unit reading is started after the movement, and the sound read simultaneously with the video data is read. The data is sequentially sonicated. After the video data necessary to reconstruct the video signal for one screen is stored in the memory, the video signal reconstruction and the video reproduction are started. by this,
When switching from the CD playback state to the karaoke state, the display of incompletely distorted images is prevented. According to the present invention, when the video playback device is mounted on a vehicle, the memory, the display control unit, and the display unit are energized from a power supply through an accessory switch of the vehicle and a switch included in the command signal output circuit. You. This prevents noise caused by the high-frequency video signal from occurring in other audio equipment connected to the power supply.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a simplified electrical configuration of a CDG playback device 1 according to one embodiment of the present invention.

FIG. 2 is a display screen displayed on a display unit 39 of the CDG reproducing apparatus 1 of FIG.

FIG. 3 is a diagram for explaining tracks of a CDG 16 which is a recording medium read by the CDG reproducing device 1 of FIG.

FIG. 4 is a diagram showing a track 17 of FIG. 3 in a straight line.

5 is a diagram for explaining a data configuration of a unit 18 in FIG.

FIG. 6 shows a group 25 stored in the memory 37 of FIG.
FIG. 4 is a diagram for explaining video data.

FIG. 7 is a flowchart for explaining a state switching operation of the CDG playback device 1 of FIG. 1;

FIG. 8 is a flowchart for explaining a video mute operation of the CDG playback device 1 of FIG. 1;

FIG. 9 is a flowchart for explaining a prohibition operation of fast-forward and fast-return operations of the CDG reproduction device 1 of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CDG reproduction apparatus 2 Audio reproduction part 3 Video reproduction part 4 Processing means 5 Reading means 6 Power supply 7 Accessory switch 8 Karaoke switch 17 Track 18 Unit 21 Audio data 22 Parity 23 Subcode 25 Group 26 Background video data 27 Lyric video data 31 Light Pip-up 32 D / A conversion means 34 Speaker 36 CDG decoder 37 Memory 38 Display control means 39 Display means 41 Control means 42 Reading position control means 43 Judgment means 44 Video mute means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 27/10 G11B 7/00 G11B 20/00 H04N 5/76-5/91 H04N 7/12

Claims (10)

(57) [Claims] For each of a plurality of groups, a plurality of video data, which are a part of a video signal for one screen, and position data indicating a recording position of each of the video data in each group are arranged along a track. A recording medium on which is recorded, reading means for relatively moving along a track of the recording medium to read the video data and the position data, display means for displaying an image, Control means for reproducing a video of each group from the video data in response to the output and displaying the video data on the display means, a command signal for outputting a command signal for instructing a start of reading of the video data. An output circuit, responsive to outputs from the reading means and the command signal output circuit, wherein the position read by the reading means upon receipt of the command signal; A determination unit for determining whether the recording position of the video data indicated by the data is the first recording position of the group to which the read position data belongs; and responding to the output of the determination unit and reading when the command signal is received. When the recording position indicated by the position data read by the means is the first recording position of the video data of the group to which the position data belongs, the reading of the video data by the reading means is continued, and the read recording position is
When it is not the recording position of the head of the video data of the group, the recording medium and the reading unit are relatively moved along the track so that the video data can be read from the head of one group, Reading position control means for reading at least the first video data of the group and subsequent video data, and causing the control means to display at least one screen of video on the display means, wherein the control means While an image is displayed, fast-forwarding, which increases the relative reading speed between the recording medium and the reading means, and fast-returning, which returns the reading means in the direction opposite to the reading direction of the recording medium, are prohibited. A video playback device characterized by the above-mentioned. 2. The reading position control means reads and reproduces at least the first video data and the following video data recorded in a group to which the position data read by the reading means when the command signal is received. The video reproducing apparatus according to claim 1, wherein: 3. The read position control means, at the time of receiving the command signal, reads at least the first video data of the next group adjacent to the downstream side in the read direction along the track of the group to which the position data read by the read means belongs. 2. The video reproducing apparatus according to claim 1, wherein the video data subsequent thereto is read and reproduced. 4. A plurality of units are arranged along a track on the recording medium, and in each unit, the video data and position data representing a position in a group to which the unit belongs are read by a reading unit. The video reproducing device is sequentially arranged along a track reading direction, the memory sequentially storing video data of each group, and sequentially reading the video data stored in the memory, 2. The video reproducing apparatus according to claim 1, further comprising a display control means for visually displaying the display means. 5. An acoustic system comprising: a sound data storage unit for storing sound data in each of the units; and a sounding unit for reading the sound data, and sounding and outputting the sound data in response to an output from the reading unit. 5. The video reproducing apparatus according to claim 4, further comprising means. 6. The display device, in response to an output from the command signal output circuit and the reading means, from when the command signal is received until immediately before at least the first video data of the group is read and reproduced. 2. The video reproducing apparatus according to claim 1, further comprising a video muting means for stopping the display of the video by said means. 7. A plurality of units are arranged along a track. Each unit includes video data that is a part of a video signal for one screen of each of a plurality of groups and a position in the group to which the unit belongs. A recording medium on which position data and audio data are sequentially recorded in a reading direction by a track reading unit; moving relatively along a track of the recording medium to obtain video data, position data, and audio data; Reading means for reading data; display means for displaying an image; and control means for responding to the output from the reading means, reproducing the image of each of the groups from the image data, and displaying the image on the display means. An operation switch serving as a command signal source for outputting a command signal for commanding start of reading of the video data; In response to the output from the operating means and the operation switch, the recording position of the video data represented by the position data read by the reading means at the time of receiving the command signal is the head recording position of the group to which the read position data belongs. Determining means for determining whether or not there is a recording position indicated by the position data read by the reading means upon receipt of the command signal in response to the output of the determining means, wherein the recording position at the head of the video data of the group to which the position data belongs When, the reading of the video data by the reading means is continued, and when the read recording position is not the first recording position of the video data of the group, the video data can be read from the head of one group. Moving the recording medium and the reading means relatively along the track, Reading position control means for reading at least the first video data and the following video data and displaying at least one picture on the display means by the control means, and a memory for sequentially storing the video data for each group Display control means for sequentially reading video data stored in the memory and visually displaying the data on the display means; and sounding means for sounding and outputting the sound data in response to an output of the reading means. Responding to the output from the operation switch and the reading means, and stopping the display of the video by the display means from the time of receiving the command signal until immediately before the video data of at least the head of the group is read and reproduced. The control unit controls the recording medium while an image is displayed on the display unit. A video playback apparatus for prohibiting fast-forwarding, which increases the relative reading speed between the reading means and the reading means, and fast-returning, in which the reading means is returned in a direction opposite to the reading direction of the recording medium. 8. A plurality of units are arranged along a track. Each unit has audio data, position data indicating the position of the unit in a group to which the unit belongs, and a video signal for one screen. A recording medium on which a portion of video data is recorded; reading means for moving relatively along a track of the recording medium to sequentially read units; and reading means for reading in response to an output from the reading means. Sounding means for converting the sound data of the unit into sound, and outputting the image data; a memory for sequentially storing the image data of the unit read by the reading means; a display means for displaying an image; Image data is sequentially read, a video signal for one screen is sequentially reconstructed from the video data of a plurality of units, and the image is displayed on the display means. Display control means for displaying, a command signal output circuit for outputting a command signal for instructing start of reading of video data in a state where only sound is reproduced, and an output from the reading means and an output from the command signal output circuit. Determining means for determining whether the position indicated by the position data of the unit read by the reading means when the command signal is received is the head position of the group to which the read unit belongs; and responding to the output of the determining means. (1) When the position of the unit read at the time of receiving the command signal is the head position of the group, reading of the unit by the reading means is continued, and the image data of the read unit is sequentially stored in the memory. 2) If the position of the unit read when the command signal is received is not the head position of the group, the unit Reading position control means for continuing reading of data and reading the video data of the read units sequentially into the memory after the unit at the head position of the group has been read, and output and reading means from the command signal output circuit Video mute means for stopping display of video on the display means from the time when the command signal is received until the time when the video signal for one screen is reproduced and becomes displayable in response to the output from the control signal. The means for reproducing the sound while the display of the image is stopped is provided. 9. A plurality of units are arranged along a track. Each unit has audio data, position data indicating the position of the unit in a group to which the unit belongs, and a video signal of one screen. A recording medium on which a portion of video data is recorded; reading means for moving relatively along a track of the recording medium to sequentially read units; and reading means for reading in response to an output from the reading means. Sounding means for converting the sound data of the unit into sound, and outputting the image data; a memory for sequentially storing the image data of the unit read by the reading means; a display means for displaying an image; Image data is sequentially read, a video signal for one screen is sequentially reconstructed from the video data of a plurality of units, and the image is displayed on the display means. Display control means for displaying, a command signal output circuit for outputting a command signal for instructing start of reading of video data in a state where only sound is reproduced, and an output from the reading means and an output from the command signal output circuit. Determining means for determining whether the position indicated by the position data of the unit read by the reading means when the command signal is received is the head position of the group to which the read unit belongs, and responding to the output of the determining means. (1) When the position of the unit read at the time of receiving the command signal is the head position of the group, reading of the unit by the reading means is continued, and the image data of the read unit is sequentially stored in the memory. 2) If the position of the unit read at the time of receiving the command signal is not the head position of the group, After the reading position of the reading unit with respect to the recording medium is relatively moved to the leading position, the units are sequentially read from the moved reading position by the reading unit, and the read image data of the units is sequentially stored in the memory. Read position control means, after at least all video data for reconstructing a video signal for one screen is stored in the memory, the video signal is reconstructed and the video is reproduced, and at the same time when the video data is read, The read acoustic data is
A video playback device characterized by being sequentially sounded. 10. When the video playback device is mounted on a vehicle, the command signal output circuit further includes a switch for operating an energized state, and the sounding unit and the reading unit are connected to a vehicle. Power is supplied from a power supply of the vehicle via an accessory switch. The memory, the display control means, and the display means are connected to a power supply of the vehicle via an accessory switch of the vehicle and a switch included in the command signal output circuit. The electric power is energized from the above, any one of Claims 1-9 characterized by the above-mentioned.
The video playback device according to the item.