JPH06131807A - Class identifying device for disk type recording medium - Google Patents

Abstract

PURPOSE:To correctly identify a type without sound information or a type recording a sound and video information by identifying wether maximum recording time indicating the recording information of a CD area from the added information of track information is shorter or longer than reference time. CONSTITUTION:When a composite disk 1 is set on a reproducing device and a starting instruction is given by an operation key 12, an optical head 4 is moved to the innermost periphery of a disk 1 by a servo control circuit 5 instructed by a system controller (SC) 14. Then, the read-in area of the innemost periphery is read by the head 4, information in a TOC area is processed by the SC 14 via a signal processing circuit 6 and the maximum recording time is extracted from a subcode. This maximum recording time is compared with referene time 10 seconds by the SC 14 and when it is shorter, it is identified to be a CDVS and when it is longer, it is identified to be a CDV, displayed on a displaying section 11 and in accordance with the identification of the circuit 5, only a video or a sound and the video are outputted. Thus, the type of the disk 1 is correctly identified and the error of the identification is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for a disk type recording medium, and more particularly to a composite apparatus combining optical disks such as CD (compact disk) and VD (video disk) set in karaoke. The present invention relates to a disc type recording medium type discriminating apparatus for discriminating a disc type.

[0002]

2. Description of the Related Art A disk type recording medium, for example, an optical disk, is a spiral track formed on a recording surface of a disk in which a large number of pieces of information are consecutively recorded in a time-sequential order. A composite disc (CDV) is generally used in which a CD in which music program information and the like are recorded as a digital audio signal and a VD in which video information is modulated by a video format and recorded as an analog video signal are combined.

Recently, with the diversification of karaoke,
Similar to the CDV, a CDV Single (hereinafter abbreviated as CDVS) having an outer diameter of about 12 cm and recording video information so as to reproduce only a background image without recording music program information is becoming popular. These discs are shown in FIG.
As illustrated as a composite disc 1 in FIG. 1, a first area (hereinafter, C) on the inner circumference side in which music program information is recorded.
D area 1a) and an outer peripheral second area (hereinafter abbreviated as VD area) 1b in which video information is recorded, and the recorded contents of the areas 1a and 1b are on the innermost circumference. A lead-in area for recording additional information related to the.

In this lead-in area, a TOC (Ta
Area 1c called ble Of Contents)
Is provided, and various information is recorded in detail by subcodes divided into 8 channels of P, Q, R, S, T, U, V, and W. This subcode is used not only for controlling performance and display but also for recording and transmitting various other data. When the composite disc 1 is set in the karaoke, this subcode is first reproduced. It Then, the program number and the recording start position are recognized, the music performance is started according to the instruction by the key operation, and the video is reproduced.

By the way, in the method of recording and reproducing the subcode in this way, the P and Q channels of the 8 channels are for controlling the performance and the display, and the R, S, T, and
Six channels of U, V and W are user bits that constitute image processing information such as color designation. The bit of the channel Q relates to time information according to the track length from the start end of the program area to a predetermined position, and indicates the recording position of each program in order of the track number starting from the smallest track number shown in the lead-in area. It forms address time data that can be used as data. Further, in the bit of the channel Q, the maximum number of recorded songs and the maximum recording time of the entire composite disc 1 are recorded as additional information. The bits of the channel P form data including music start information.

Therefore, in the channel Q of the CDV, the recording start position corresponding to each music program number recorded in the CD area 1a is recorded in units of minutes and seconds, and the maximum number of recorded songs and maximum recording time are recorded. Etc. are recorded. On the other hand, the above-mentioned CDVS in which no music program is recorded
In this case, the maximum recording number is the same as the minimum track, but the maximum recording time is 4 seconds. These 4 seconds are required to set the silent time as short as possible when the CDVS is set in karaoke and to immediately shift to image reproduction.

[0007]

By the way, since the composite disc 1 of this kind is hard to distinguish in appearance, the color of the disc is gold or silver as compared with the prior art, and the disc is made of CDV or CDV / Single. Although they are displayed so that they can be distinguished from each other, it has not been thoroughly known to general users and various problems remain.

For example, commercially available CDV and CDVS
Since the drawings and designs of music are usually imaged on the disc, the CDVS is often thought of as a CDV and purchased. When this CDVS is set to karaoke and started, after only a few seconds of silence, only the image is played and the music is not played, so the user first mistakes it as a karaoke failure and asks for repair. Become. It took a considerable amount of time to realize that this was just a mistake in the type of disc, and was uncomfortable. Further, it is a waste of time to shift to the reproduction of the image after reproducing the silent part, and there is a problem that the viewer feels frustrated.

The present invention has been made in view of the above situation, and an object thereof is to provide a composite disc, which is set in a performance device such as karaoke, and which combines a CD and a VD, with a single type in which only audio signals are not recorded. A disc-type recording medium capable of determining whether or not the disc type is present to prevent the user from making an erroneous decision by providing information indicating the type of the disc, and solving the problem of causing discomfort to the viewer. It is to provide a type determination device.

[0010]

In order to achieve the above object, the present invention has an audio area for recording audio information in a spiral track, a video area for recording video information, and the audio and video areas. Reading means for reading the additional information of the disc type recording medium provided with an information area for recording additional information such as the number of recorded information and maximum recording time of the recorded information, and the maximum recording from the additional information read by the reading means. Extraction means for extracting time is compared with the maximum recording time indicating the information recorded in the audio area from the extraction information of this extraction means and a preset reference time, and the maximum recording time is shorter than this reference time. At this time, the disc type recording medium is provided with a determining means for determining that the type is a type in which acoustic information is not recorded.

[0011]

In the present invention, when the track information of the disk type recording medium is read by the reading means, the maximum recording time is extracted from the additional information by the extracting means. And
The determination means compares the maximum recording time, which indicates the information recorded in the CD area, of the maximum recording time with a preset reference time. As a result, when the maximum recording time is shorter than the reference time, it is determined that the disc type recording medium is a type in which no acoustic information is recorded.

On the other hand, when the maximum recording time is longer than the reference time, the acoustic information is recorded in the CD area, and V
It is determined that the type is such that video information is recorded in the D area. Therefore, even if the disc-type recording medium has the same shape or is difficult to distinguish in appearance, the type of the disc-type recording medium can be properly identified. Therefore, the problem of misidentification of the type, which has occurred when the disc type recording medium is set in the disc reproducing apparatus, can be avoided.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an electrical block diagram of karaoke to which the disc type recording medium type determining apparatus according to the present invention is applied. This disc type recording medium type determination device is applied to karaoke and is configured to determine the type of the composite disc 1 set in this karaoke.

The composite disc 1 is the same CDV and CDVS as the conventional one, in which a digital audio signal is recorded in the CD area 1a on the inner circumference side of a spirally formed track and at the outer circumference side. V
An analog video signal is recorded in the D area 1b. Further, in the TOC area 1c of the lead-in area formed on the innermost circumference, the program number, the maximum recording time, etc. are recorded by the subcode of the Q channel as additional information regarding the recording of the areas 1a, 1b. The maximum recording time of this additional information is recorded in CDV in units of minutes and seconds according to the number of programs, and in CDVS as 4 seconds.

In karaoke, the spindle motor 3 is rotated and driven with the composite disk 1 set on the mounting portion 2. An optical head 4 for irradiating a recording surface with a light beam to read and reproduce information is arranged on one side of the composite disk 1. The optical head 4 includes an optical system such as a laser diode and an objective lens, and is linearly driven by a drive mechanism. The information read by the optical head 4 is given to the signal processing circuit 6 and the servo control circuit 5.

The servo control circuit 5 detects the rotational speed of the spindle motor 3 by a rotary encoder (not shown), and based on the disk radial position information supplied from the system controller 14, the composite disk 1
The rotation speed of the spindle motor 3 is controlled so that the linear velocity of the optical head 4 with respect to is constant. Signal processing circuit 6
Is configured to process reproduction data read by the optical head 4, extract and align required data, and perform error correction processing if necessary. The digital data string from the signal processing circuit 6 is converted into an analog signal by a D / A converter (not shown),
It is sent to the audio control circuit 7 and the video control circuit 8.

The output of the audio control circuit 7 is supplied to the audio output terminal 9, and the output of the video control circuit 8 is supplied to the video output terminal 10. A mute signal from the system controller 14 is led to the voice control circuit 7. Of the data processed by the signal processing circuit 6, the additional information recorded in the TOC area 1c is recorded in the TOC area of the memory unit 13 by the system controller 14. The additional information and the like recorded in this TOC area are read by the system controller 14 as necessary and displayed on the display unit 11. This display unit 11
Is composed of a liquid crystal display, and in addition to the type of the composite disc 1, the song number, playing time, operating state, etc. are displayed.

The play and the mode designation by the user are performed by the operation keys 12 and read by the system controller 14. In this example, the composite disc 1
When the designation operation for determining the type of is performed, time data of 10 seconds is stored as the reference time. During this 10 seconds, the maximum number of recordings in the CD area 1a of the CDVS is 0, and the maximum recording time is 4 seconds.

The system controller 14 controls the operation of the entire karaoke and also serves as a judging means for judging the type of the composite disk 1. The system controller 14 is composed of a microcomputer and has a ROM / RAM. The system controller 14 sends a control signal to the servo control circuit 5 in accordance with data or a program stored in the ROM / RAM based on the operation signal sent from the operation key 12 to drive the spindle motor 2 and the drive mechanism. Controls on / off to execute commands such as play, search, and jump.

Further, the maximum recording time data is extracted from the sub-code of the additional information sent through the signal processing circuit 6 and is compared with the reference time data of the memory section 13,
The display unit 1 performs control to determine the type of the composite disk 1.
The identification signal is sent to the display unit 1 to display CDV or CDVS. Next, the operation of the disc type recording medium type determination apparatus will be described with reference to the flowchart of FIG.

However, the above-mentioned CDV and CDVS determined by the disc type recording medium type determination device are:
A case will be described in which the user has an appearance that cannot be easily identified and is mounted on the karaoke as the composite disc 1. First, when the composite disc 1 is set to the reproducing position and a start command is issued by the operation key 12, the system controller 14 sends a control signal to the servo control circuit 5 to drive the drive mechanism to combine the optical head 4 with the optical head 4. The disc 1 is moved to the innermost position. When the optical head 4 reaches the innermost position, the lead-in area is read (step S11).

The T recorded in this lead-in area
When the read information of the OC area 1c is guided to the system controller 14 via the signal processing circuit 6, the type of the composite disk 1 is determined by extracting the subcode. here,
The subcode channel Q bit is the composite disc 1
Since the address time data that includes the time information corresponding to the track length and can be used as position data indicating the recording position is formed, the maximum recording time in this address time data is extracted (step S12).

When this maximum recording time data is compared with the reference time data of 10 seconds (step S13), if it is less than 10 seconds, it is judged that the composite disc 1 is CDVS (step S14). On the other hand, when the maximum recording time is longer than the reference time data, it is determined to be CDV (step S15). The determination results are sent to the display unit 11 to display that the composite disc 1 currently set in karaoke is CDVS or CDV (step S16). Therefore, the user
It is possible to know whether the composite disc 1 is a single type of video only or a composite type in which audio and video are combined.

By the way, when the composite disk 1 is a CDVS, a control signal is sent from the system controller 14 to the servo control circuit 5 to drive the drive mechanism to move the optical head 4 to the VD area 1b. As a result, the video information is immediately reproduced and the silent part of the CD area 1a is not reproduced, so that the user can confirm that the CDVS is displayed on the display unit 11 and the background image is displayed, so that the video is displayed without confusion. Can be used.

On the other hand, when the composite disc 1 is a CDV, the system controller 14 gives a command to the reproduction operation to the VD area 1b, and the music and video information are reproduced together to visually recognize the background image and watch the accompaniment. Is possible. It should be noted that in the above embodiment, the disc type recording medium type determination device is applied to a karaoke system for CDV and CD.
Although the case of determining the VS has been described, the type of various discs in which the recording area is divided into a plurality of areas and different information is recorded in each area by being configured in the electric circuit section of another disc reproducing apparatus is described. It may be determined.

[0026]

As described above, according to the present invention, the maximum recording time indicating the information recorded in the first area from the additional information in the TOC area is read as the reference time after reading the track information of the disk type recording medium. When comparing, if it is shorter than the reference time, it is judged that this disc type recording medium is a type that does not record acoustic information, so if the disc type recording medium has the same shape or it is difficult to distinguish in appearance. Even in this case, it is possible to properly know whether or not this type of disc-type recording medium is of a type in which audio information and video information are recorded.

Therefore, a CDV that does not record acoustic information, which is a modification of the CDV set in a performance device such as karaoke,
When I set the Single and started it, I mistakenly thought that the music was not played and the performance device was broken.
The problem of having to ask for repairs disappears. Further, in the CDV / Single, it is possible to shift to the reproduction of an image without reproducing a silent portion, so that there is no loss time and there is an effect that a problem that a viewer feels frustrated can be solved.

[Brief description of drawings]

FIG. 1 is an electrical block diagram of a karaoke to which a disc type recording medium type determining apparatus according to an exemplary embodiment of the present invention is applied.

FIG. 2 is a schematic diagram of a disc showing a state in which recording areas are separated.

FIG. 3 is a flowchart for explaining a type determination operation.

[Explanation of symbols]

 1 Disc type recording medium 1a 1st area 1b 2nd area 1c TOC area

Claims (1)

[Claims] 1. An audio area in which acoustic information is recorded on a spiral track, a video area in which video information is recorded, and additional information such as the number of recordings of the audio and information recorded in the video area and the maximum recording time. Reading means for reading the additional information of the disc type recording medium provided with an information area for recording, extracting means for extracting the maximum recording time from the additional information read by the reading means, and the extraction information of the extracting means The maximum recording time indicating the information recorded in the audio area is compared with a preset reference time, and when the maximum recording time is shorter than the reference time, the disc-type recording medium records acoustic information. A disc type recording medium type determination device, comprising: a determination unit that determines that the type is a non-existent type.