JPH08106763A - Disk reproducing apparatus - Google Patents

Abstract

PURPOSE: To select sound data alone out of a disk wherein the sound data and digital data are recorded mixedly and to reproduce them continuously, by discriminating between tracks of the sound data and the digital data and by changing the order of tracks and executing reproduction. CONSTITUTION: Subcodes of a table of contents (TOC) for discriminating between tracks of sound and digital data in a lead-in area 1A of CD1 is demodulated by an EFM demodulation circuit 7 and a subcode demodulation circuit 9 and supplied to a microcomputer 14. The microcomputer 14 detects the track of the sound track recorded mixedly with the digital data in a program area 1B of the CD1. Based on the result of this detection, only the sound track is selected continuously automatically through a servo control circuit 3 and reproduction is executed. Thus, it is possible to select the sound data alone out of the CD wherein the sound data and the digital data are recorded mixedly and to reproduce them continuously, without any break.

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 reproducing a disc such as a compact disc in which audio data and other digital data tracks are mixed.

[0002]

2. Description of the Related Art Conventionally, a device capable of reading audio data from a compact disc and reproducing it, that is, a compact disc reproducing device, has a total playing time information of the disc, information of the total number of tracks of the disc, and information of each track. Information on the start time, information on whether each track is an audio track, or other digital tracks can be read. The information is the TOC (Table) information.
of contents) is recorded in a predetermined area of the CD.

Hereinafter, a predetermined area in which TOC information is recorded will be referred to as a lead-in area. Using the TOC information in this lead-in area, the total playing time of the disc is displayed, the remaining playing time of each track is displayed, and the songs recorded on the disc are specified and selected, according to the selected order. You can play.

During playback, the data read from the subcode Q recorded in the program area of the disc is used to display the elapsed playing time of the song being played, or to display audio data or digital data other than audio. It is possible to determine whether the data is data and not output the voice from the voice output unit when the data is not the voice data.

[0005]

When reproducing a disc in which audio data and other digital data tracks are mixed, the compact disk reproducing device does not output audio from the digital data tracks as well as the audio data tracks. Since it is played back, there is a problem that the free time is wasted and the usability is poor.

When a track of digital data is reproduced without outputting sound, when this disc is normally reproduced by a disk reproducing device and the sound data is recorded on a recording medium by a recording device connected to the reproducing device, the digital data part is recorded. Is recorded as a silent part. Therefore, by selecting only a track of audio data (hereinafter referred to as a program) and reproducing it, it is possible to prevent recording of a track of a silent part due to digital data.

In this case, however, a problem arises in that the operator must identify the audio data track or the other digital data track and program the audio data by key operation or the like so that the audio data continues. Therefore, the present invention has been made in order to solve the above problems, and its purpose is to identify whether the track is audio data track or other digital data track with TOC information being read. It is an object of the present invention to provide a disc reproducing apparatus which performs the above-mentioned operation and automatically programs and reproduces only a track of audio data.

[0008]

The present invention has means for selecting a track of audio data and a track of other digital data from the reproduced TOC information in the table of contents data, and automatically selects the audio data. This is a disc playback device that automatically programs and plays only the tracks. The compact disc reproducing apparatus of the present invention has means for reproducing a track of audio data, and means for selecting a track of audio data and a track of other digital data from the lead-in area of the compact disc. It is equipped with a means for changing the order of, and when playing a compact disc or the like in which audio data tracks and other digital data tracks are mixed, only the audio data tracks are automatically programmed to This is a device that plays back only the tracks.

[0009]

According to the present invention, even when reproducing a compact disc in which audio data and other digital data tracks are mixed, as in the conventional case, whether the operator is the audio data track or the other digital data track. It is possible to obtain continuous playback by automatically selecting only audio data without distinctively inputting a program.

[0010]

An embodiment of the present invention will be described with reference to the drawings. As an embodiment of the present invention, a compact disc reproducing apparatus will be taken up. First, FIG. 1 shows the configuration of a compact disc reproducing device capable of reproducing a compact disc (CD).
An example of the compact disc reproducing apparatus will be described with reference to a system diagram.

Reference numeral 1 denotes a CD as a compact disc, which is loaded onto the turntable 2B of the player 2 by loading the CD 1 into the compact disc reproducing apparatus. The CD 1 is fixed on the turntable 2B at its center and is rotatable by a spindle motor 2A. The optical pickup 4 is slidable in the axial direction of the CD 1 by a slide motor 5. The servo control circuit 3 controls the spindle motor 2A and the slide motor 5
Control of the optical pickup 4, focus control and tracking control of the optical pickup 4, control of the semiconductor laser in the optical pickup 4, and the like.

First, the path for outputting the sound of the recorded information on the CD 1 will be described. The information recorded on the CD 1 is the optical pickup 4
Read by the head amplifier 6 and applied to the EFM demodulation circuit 7. The EFM demodulation circuit 7 demodulates the EFM and divides it into voice data and subcode data.
This voice data is input to the CIRC demodulation circuit 8.
The CIRC demodulation circuit 8 performs alignment restoration processing of the audio data from the EFM demodulation circuit 7, and inputs the audio data to the digital filter 11. Digital filter 11 has Lch and Rch
The audio data is separated and input to the D / A converter 12. The D / A converter 12 converts the digital data into an analog signal and outputs the audio data to the reproduction output 13 as an analog signal.

Next, the route for displaying the subcode information will be described. The recorded information of the CD 1 is read by the optical pickup 4, passes through the head amplifier 6, and the EFM demodulation circuit 7
Is added to The EFM demodulation circuit 7 demodulates the EFM and divides it into voice data and subcode data. This subcode data is demodulated by the subcode demodulation circuit 9 and input to the microcomputer 14. The microcomputer 14 uses the input subcode information to display the elapsed performance time and the like on the display unit 15.

Incidentally, the microcomputer 14 reproduces,
The servo control circuit 3 for controlling the focus, tracking, slide, spindle servo, etc. of the optical pickup 4 and the sub-code demodulation circuit 9 are connected via a bus,
Receives and transmits control data. In addition, the operation unit 16
Is an input unit of the microcomputer 14, an operation unit having various command signals and ten keys, and a display unit 15.
Is for displaying various data from the microcomputer 14 and is a display device such as a liquid crystal display or a fluorescent display tube.

Next, the shape of the compact disc will be described with reference to the shape of the compact disc shown in FIG. 1 indicates a compact disc, the diameter of which is 120
It is defined as mm. 1D shows the center hall,
Its diameter is defined as 15 mm. In this compact disc, areas in which information is recorded are divided into a lead-in area 1A, a program area 1B, and a lead-out area 1C.

In the lead-in area 1A, TOC information, that is, the table of contents information of the disc is recorded. The lead-in area 1A has a starting diameter of 46 mm or less, and the ending diameter, that is, the starting diameter of the program area 1B is 50 mm.
It is defined as mm. Music information is recorded in the program area 1B, and the diameter is defined to be 50 mm to 116 mm. The lead-out on the outside
In the area 1C, the end information of the last song of the disc is recorded, and the end diameter is the program area 1B.
The diameter is +1 mm or more.

Next, regarding the format of the TOC information of the subcode recorded in the lead-in area 1A, the data structure of the subcode (TOC) information in the lead-in area of FIG. 3 is used. explain. SQ1
S0 and S1 are synchronization signals for identifying the beginning of the subcode block. CONTROL of SQ2 is 4-bit information of Q1 to Q4 of subcode Q, ON / OFF of pre-emphasis, number of audio channels,
Indicates identification information of digital data.

When CONTROLS Q2 is "00x0", it represents 2-channel audio without pre-emphasis. When "10x0", no pre-emphasis,
Represents 4-channel audio. When it is "00x1", it represents 2-channel audio with pre-emphasis. When "10x1", there is pre-emphasis,
Represents 4-channel audio. When it is "01x0", it represents a data track. Here, "x" indicates "0" or "1".

ADR of SQ3 is Q5 to Q5 of subcode Q.
This is 4-bit information of Q8, which is identification information of the data format of the subcode Q, and modes 1 to 3 are defined. When ADRSQ3 is "0001", the data of subcode Q indicates the data of the track number and time information. When it is "0010", it indicates that the data of the subcode Q is data such as the catalog number of the disc. "
0011 ", the subcode Q data is ISRC
Indicates that this is code data.

TNO of SQ4 indicates a music number and is represented by a 2-digit BCD (decimal number). TNOSQ
When 4 is "00", it indicates a lead-in area. When it is "01" to "99", it indicates the song number in the program area. When "AA", it indicates that the area is a lead-out area.

In the data structure of the subcode (TOC) information in the lead-in area of FIG. 3, ADRSQ3 is "00".
01 "indicates the data structure when TNOSQ4 is" 00 ". POINT of SQ5 indicates the contents of the contents of the lead-in area. When POINTSQ5 is" 00 "to" 99 ", the number It represents the absolute time when the song starts. "
When A0 ", PMINSQ10 recorded later is recorded.
Indicates the first song number. When it is "A1", the data of PMINSQ10 recorded later indicates the last song number. When "A2", P recorded later
MINSQ10, PSECSQ11, PFRAMESQ
12 indicates the absolute time when the lead-out area starts. MINSQ6, SECSQ7, FRAMESQ8
Indicates the elapsed time in the song. CRCSQ13 indicates cyclic code error detection data.

Next, an example of contents of TOC information in the lead-in area will be described with reference to Table 1.

[0023]

[Table 1]

Data of frame numbers n to n + m are repeatedly recorded in the lead-in area, and in this example, data of frame numbers n to n + 17 are repeatedly recorded as a group. Among them, n ~ n
+2, n + 3 to n + 5, ..., N + 15 to n + 17, 3 frames are POINT, PMIN, PS
The same data is recorded in EC and PFRAME.

The data of n to n + 2 is track number "0".
1 "indicates that the start time is 00 minutes 02 seconds 40 frames. Similarly, for the data of n + 3 to n + 5, the start time of the track number" 02 "is 20 minutes 05 seconds 35 in absolute time.
Indicates a frame. For the data of n + 6 to n + 8, the start time of track number "03" is 50 minutes 20 seconds 50.
Indicates a frame. The data of n + 9 to n + 11 indicates that the minimum track number is “01”. n
For the data of +12 to n + 14, the last track number is "0".
The data of n + 15 to n + 17 indicates that the start time of the lead-out area is 55 minutes 15 seconds 05 frames. From this information, this disc has a total of 3 songs. So, the total playing time is 55 minutes 15
It can be seen that the performance time of the first song is 20 minutes 2 seconds 69 frames, the performance time of the second song is 30 minutes 30 seconds 15 frames, and so on.

A procedure for identifying a track of audio data and a track of other digital data from the TOC information in the lead-in area and automatically selecting only the track of the audio data to perform a program is shown. An embodiment of the compact disc reproducing apparatus shown in FIG. 1 and a flowchart of FIG. 4 will be described.

The power of the compact disc reproducing device is turned on.
The performed state is step ST1. When the state of step ST1 is reached, the process proceeds to step ST2, in which the microcomputer 14 rotates the spindle motor 2A via the servo control circuit 3 and operates the slide motor 5 to move the optical pickup 4 to the lead-in area 1A. Move to. Next, in step ST3, the TOC recorded in the lead-in area 1A by the optical pickup 4 is recorded.
Read the information. The read data passes through the head amplifier 6, the EFM demodulation circuit 7, and the subcode demodulation circuit 9,
It is input to the microcomputer 14.

In step ST4, the input information is
The data storage area of the microcomputer 14 stores information as to whether each track is audio data or track data of other digital data, playing time of each track, total playing time information of the disc, and the like, and the process proceeds to step ST5. Here, when the data track is included in the stored data, the mode is changed to the program mode, and the process proceeds to step ST6. If there is no data track, the direct mode is still maintained, and the state shifts to the direct mode reproduction start preparation completed state in step ST14. After changing to the program mode in step ST6, the process proceeds to step ST7.

In step ST7, the minimum track number is input to the variable TR, and the process proceeds to step ST8. In step ST8, it is checked whether the variable TR is larger than the maximum track number. When TR is smaller than the maximum track number, the process proceeds to step ST9 and it is determined whether the track indicated by the variable TR is a track of audio data or another data track. If the track is a track of audio data, the process proceeds to step ST10 and variable T
Program the track number indicated by R.

In order to check the next track, the process proceeds to step ST12, and the value obtained by incrementing the variable TR by 1 is added to the variable T.
Input to R and shift to step ST8. Similarly, the track is checked in step ST9, and if the track is a data track, the process proceeds to step ST11,
Step S without programming the track indicated by the variable TR
The process proceeds to T12 and step ST8.

When the variable TR becomes larger than the maximum track number in step ST8, checking of all tracks is completed, and the process proceeds to step ST13, in which only the audio data song is selected, and the program mode reproduction ready state is set. Becomes

[0032]

According to the present invention, when reproducing a disc in which audio data and other digital data tracks are mixed, the operator discriminates between audio data tracks and other digital data tracks as in the prior art. However, only the audio data can be automatically selected and continuously played back without a designated program. Further, when a disc is inserted and the program mode is automatically set, it can be automatically determined that the disc is a disc in which audio data and other digital data tracks are mixed.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a compact disc reproducing apparatus of the present invention.

FIG. 2 is an external view showing the shape of a compact disc.

[Figure 3] Subcode (TOC) in the lead-in area
The figure which shows the data structure of information.

FIG. 4 is a flowchart showing an automatic program for audio data tracks in a compact disc reproducing device.

[Explanation of symbols]

 1 compact disc (CD) 1A lead-in area 1B program area 1C lead-out area 2 player 2A spindle motor 2B turntable 3 servo control circuit 4 optical pickup 5 slide motor 6 head amplifier 7 EFM demodulation circuit 8 CIRC demodulation Circuit 9 Sub-code demodulation circuit 11 Digital filter 12 D / A converter 13 Playback output 14 Microcomputer 15 Display section 16 Operation section

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G11B 27/10 A 9369-5D

Claims (2)

[Claims] 1. A disc reproducing apparatus, which comprises means for reproducing a track of audio data, selecting means for selecting a track of audio data and a track of digital data from the reproduced data in the table of contents area of the disk, and the order of the tracks. When reproducing a disc in which audio data tracks and other digital data tracks are mixed, the audio data tracks are selected by the selecting means and only the audio data tracks are reproduced. Characteristic disc playback device. 2. A disc reproducing apparatus, means for reproducing a track of audio data, selecting means for selecting a track of audio data and a track of other digital data from the reproduced data of the table of contents area of the disk, and a track. When playing a disc in which the audio data tracks and other digital data tracks are mixed, the audio data tracks and digital audio tracks are automatically selected by the above selection means. A disc reproducing apparatus having means for discriminating and displaying a disc in which data tracks are mixed.