JPH05234085A - Reproducing device - Google Patents

Abstract

PURPOSE:To obtain a reproducing device which does not reproduce an unneces sary noise even in a disk in which data except a music signal, such as program data, image data, character data are recorded in the part of a pre-gap of the head of a track. CONSTITUTION:The signal of a disk 1a is read by a light receiving/emitting means 2, demodulated by a signal demodulating means 3 and an error detection/ correction processing is executed. Subsequently, a main signal and a sub-signal are separated by a main signal/sub-signal separating means 4. By a main signal processing means 6, the music is regenerated from the main signal and by a sub-signal analyzing means 5, the control code of each track is identified from the sub-signal. Then, at the time of regeneration when the control code of the head track is an index '0', an access control means 15 does not regenerate the main signal as the music signal, and issues an instruction for regenerating the sound signal in the case of an index '1'.

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 an optical disc in which a program, an image, a character signal, etc. are recorded in addition to a music signal.

[0002]

2. Description of the Related Art Optical compact discs (referred to as CDs) and laser discs (referred to as LDs), and players for reproducing these discs are in widespread use. In these discs, a table of contents (referred to as TOC) area for recording information such as the start point of a song is provided in the innermost track of the disc.
In addition, the frame of each track is provided with a main signal section for recording a music signal and the like and a sub signal section for recording various control codes, and the player performs track access based on these pieces of information.

Next, a conventional reproducing apparatus for reproducing a music CD and a CD on which a music signal and other data are recorded will be described. FIG. 5A is an explanatory diagram showing the arrangement of main signals, sub-signals, etc. recorded in each frame of a conventional music CD. The signal of each frame is configured in units of (1/75) seconds. Within one frame, a main signal such as a music signal, sub-signals of various control codes, a sync signal indicating the beginning of 1-unit data, and 1 unit Error detection and correction signals for detecting and correcting the data error of are recorded respectively.

FIG. 5B is a schematic diagram showing the format of a conventional music CD. Music signals are recorded in the main signal portion of each track. In addition, the sub-signal part of each frame
The control code signals such as the absolute time (minute, second, frame number) of the unit data, [index 0] indicating the beginning of the track, and [index 1] indicating the start of the music signal in the track are displayed. It is recorded. Further, in each frame, the number of 0 to 74 indicating the arrangement order is (1/7
5) Allocated every second. Usually, the section of [index 0] is called a pre-gap section and is used as a segment between songs. The section of [index 0] does not have to be recorded in the tracks after the track # 2.

As shown in FIG. 5B, in the track # 1 in which the first music piece is recorded, a silent signal is recorded in the main signal portion in the pre-gap section of [index 0] located at the head portion. In addition, a lead-in area is provided in front of track # 1, a silent signal is recorded in the main signal portion, and TOC data is recorded in the sub signal portion. Assuming that a music signal of three songs is recorded on this CD, for example, a lead-out area indicating the end of the disc is provided after the track # 3 of the third song.

FIG. 6 is a diagram specifically showing the TOC data of this CD. In this figure, the start time of the music of track # 01 is (00 minutes, 02 seconds, 32 frames), and
It is recorded from the C point shown in (b). Similarly, the start times of the tracks # 02 and # 03 are (10
Minutes, 15 seconds, 12 frames), (25 minutes, 45 seconds, 00 frames)
It is recorded from B point and X point.
Next, on the track # A0, data indicating the starting song number at the beginning is recorded. Here, (01,00,00) means that
The starting music number is (01) and is a symbol indicating that the recording medium is a CD. Similarly, on track # A1 (03,0
0,00) indicates that the ending music number is (03). Also, (52,48,41) of track # A2 is shown in FIG. 5 (b).
It represents the last absolute time at which a voice signal can theoretically be recorded as indicated by the Y point.

FIG. 7 is a block diagram showing the structure of a general reproducing apparatus for reproducing a music CD and a CD on which other data is recorded. In the figure, a CD 1 is a disc on which audio signals and data for managing each audio signal are recorded. The light receiving and emitting device 2 is a C mounted on the disc reproducing device.
The signal of D1 is read, and includes an optical pickup that detects a recorded signal by tracking. The signal demodulating means 3 is a circuit that performs deinterleaving on a digital signal obtained from the read signal of the light receiving and emitting device 2, performs error detection, and performs error correction processing to demodulate the original digital data. The main signal / sub signal separation means 4 is a circuit for separating the output of the signal demodulation means 3 into a main signal and a sub signal.

Next, the sub signal analyzing means 5 is a circuit for analyzing the control code contained in the sub signal obtained from the main signal / sub signal separating means 4. The control code indicates an attribute of data recorded on each track, and is an index signal shown in FIG. 5 (b). The main signal processing means 6 processes the main signal obtained from the main signal / sub signal separating means 4, and the digital audio signal separated here is given to the audio signal processing means 6a and converted into an analog audio signal. It The access control means 7 includes a microprocessor and a memory, and as shown in signal processing described later, an output control signal according to a control code from the operation key and the sub-signal analysis means 5 and an access control for moving the light receiving and emitting device 2. It outputs a signal and. The drive means 8 is a drive circuit that controls the rotation of the CD 1 and performs track access to the light receiving and emitting device 2.

The operation key judgment means 9 gives instructions to the access control means 7 such as selection of a music piece and start of reproduction, and judges the input of the operation keys 10 to 12 of the disc reproducing apparatus main body or the remote control device. The output of the access control means 7 is given to the main signal processing means 6 or the driving means 8. The play key 10 instructs the reproduction of the music of the CD 1, the fast-forward key 11 instructs the fast-forward in the direction of increasing the program number and the fast-reverse key 12 the operation key instructing the fast-rewind in the direction of the decreasing program number. Is.

The operations of the CD and the reproducing apparatus having the above-mentioned configurations will be described with reference to FIGS. 7 and 8. FIG. 8 is a flowchart showing signal processing in the access control unit 7. First, when the CD1 is set in the reproducing device and the CD1 is rotated by the driving means 8, the signal recorded in the lead-in area of FIG. 5B is read via the light receiving and emitting device 2. This signal is reproduced by the signal demodulating means 3 and given to the main signal / sub signal separating means 4. Main signal / sub signal separation means 4
Supplies the separated sub-signal to the sub-signal analysis means 5, where the TOC data contained in the lead-in area is read,
The data is stored in a storage unit (not shown).

When the CD 1 is in a reproducible state, the operation is started, and when the reproduction key 10 is pressed in step 21, the operation key determination means 9 determines the reproduction mode, and outputs a signal to the access control means 7. The first song played here is 1
If it is the tune, the access control unit 7 refers to the TOC data stored in the storage unit in step 22, and the first tune is as shown in FIG. 6 (00 minutes 02 seconds 32 frames).
Know that is the start time. Then, proceeding to step 23, the access control means 7 outputs an access control signal to the driving means 8 so as to move the light receiving and emitting device 2 immediately before the point C in FIG. In addition, between the points A and C, a silent area of usually 2 to 3 seconds is provided as a margin section. Now, when the point C is reached, the process proceeds to step 24 to check whether the control code is [index 1],
If it is [1], the process proceeds to step 25, and an ON signal is given to the main signal processing means 6 as an output control signal. Then, the main signal processing means 6 outputs the music signal of the first music piece to the audio signal processing means 6a. If a signal error is detected by the signal demodulating means 3 using the error detection / correction signal shown in FIG. 5A and it is determined that various error corrections are impossible,
The main signal processing means 6 does not output an audio signal or gives a signal subjected to interpolation processing to the audio signal processing means 6a.

Next, the operation when the fast-forward key 11 of the reproducing apparatus is operated will be described. By accessing the lead-in area immediately after the start of the operation, the access points in the lead-in area and the lead-out area have already been confirmed by the access control means 7 by the TOC data. When the fast forward key 11 is operated, step 30
The process proceeds to 31 to check whether the read track is the lead-out area, and if it is not the lead-out area, proceed to step 32, move the photodetector 2 to the outer peripheral side of the CD 1, and select the target track. .. Now fast forward key 11
When the operation is continued, the movement of the light receiving and emitting device 2 to the outer peripheral portion is continued. When the lead-out area is detected at the point Y, the process proceeds to step 33, and the movement of the light receiving / emitting device 2 is stopped.

Now, let us consider the operation when the reproduction of the last music is completed, or when the reproduction of the specific music is stopped and the fast-reverse key 12 is operated. When the fast rewind key 12 is operated, the process proceeds from step 34 to step 35 to check whether the read track is the lead-in area. If it is not the lead-in area, the process proceeds to step 36, and the photodetector 2
To the inner circumference. When the fast-reverse key 12 is continuously operated, the light receiving and emitting device 2 continues to move toward the inner peripheral side of the CD 1 to select the target track. If the lead-in area is detected at point A when the movement toward the inner circumference side is further continued, the process proceeds to step 33, and the movement of the light receiving and emitting device 2 is stopped.

[0014]

However, as shown in FIG.
In the pregap section shown in (b), a program other than a music signal, that is, data other than a music signal such as program data, image data, and character data is recorded in the pregap portion at the head of the track as shown in FIG. There is also CD1a. When the CD 1a is reproduced by the reproducing apparatus of FIG. 7, there is a problem that data other than music is reproduced as it is, and extremely large noise is output.

The present invention has been made in view of the above conventional problems, and data other than music signals such as program data, image data, and character data is recorded in the pregap portion at the head of a track. It is an object of the present invention to provide a reproducing apparatus capable of signal processing so that unnecessary noise is not reproduced even in a recorded CD.

[0016]

DISCLOSURE OF THE INVENTION The present invention is a disc reproducing apparatus having a track on which a music signal and a data signal such as a program, an image and a character are recorded, and a light receiving and emitting device for reading a signal from each track of the disc. Means, driving means for rotating the disk and accessing the light receiving and emitting means to a predetermined track, signal demodulating means for demodulating the output of the light receiving and emitting means for error detection and correction processing, and output of the signal demodulating means A main signal / sub signal separating means for separating the main signal and the sub signal, a main signal processing means for processing the main signal and outputting a music signal, and an attribute of the data recorded on each track by analyzing the sub signal. Means for identifying the control code indicating the control code and operation key determining means for identifying the operation mode of the reproducing apparatus by the signal from the operation key such as the reproduction key, the fast forward key, and the fast reverse key An access control means for outputting an access control signal to the drive means by the output of the operation key determination means and the control code of the sub signal analysis means, and for giving an output control signal for instructing the main signal processing means to output a music signal, It is characterized by having.

[0017]

According to the present invention having such a feature, the signal read from each track of the disk by the light receiving and emitting means is demodulated by the signal demodulating means and subjected to error detection and correction processing. Then, the main signal / sub signal separation means separates the main signal and the sub signal. A music signal is output from the separated main signal by the main signal processing means. Further, the sub-signal is given to the sub-signal analyzing means to identify the control code recorded on each track. Next, when an operation key such as a reproduction key, a fast-forward key or a fast-return key is operated, the operation key determination means identifies the operation mode of the reproduction device. Then, the access control means instructs the main signal processing means to output the music signal, and also gives the access control signal to the drive means based on the control code of the sub signal analysis means. In this way, the disc is driven to rotate and the light receiving and emitting means is accessed to a predetermined track. If the control code of the first track is index 0, the audio signal is not output, and if it is index 1, the audio signal is reproduced.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
Will be described with reference to. FIG. 1 shows the CD in this embodiment.
9 is a block diagram showing the configuration of the reproducing apparatus of FIG. 7, and the same parts as those of FIG. The difference from the conventional example is that instead of the access control means 7, an access control means 15 in which a signal processing procedure for processing the pregap data of the track # 1 is added is provided. The access control means 15 will be described later.
Control code discrimination means 15a, output control signal generation means 15
b, the access control signal generating means 15c is included. 3 and 4 are flowcharts showing the signal processing of the access control means 15 of this embodiment. In this figure, the operations in steps 21 to 36 are the same as those in the flowchart in FIG.

First, when the CD 1a as shown in FIG. 2 is set in the reproducing apparatus of this embodiment and the CD 1a is rotated by the driving means 8, the signal recorded in the lead-in area of FIG. Read. This signal is reproduced by the signal demodulating means 3 and given to the main signal / sub signal separating means 4. The main signal / sub signal separation means 4 gives the separated sub signal to the sub signal analysis means 5, where the TOC data contained in the lead-in area is read and the data is stored in the storage section.

When the CD 1a is in the reproducible state, the operation is started, and when the reproduction key 10 is pressed in step 21, the operation key determination means 9 determines the reproduction mode and outputs a signal to the access control means 15. Then, in steps 22 and 23, the TOC information is referenced to move to the point immediately before the point. Then, the track index is checked, and if [index 1] is not found in step 24, the process proceeds to step 40, and it is checked whether or not the track number is 1. Normally, the number of the first track is 1, so if the track number is not 1, it is determined that the circuit is malfunctioning and this process is stopped. If the track number is 1, the flow advances to step 41 to check the index. As shown in FIG. 2, the index of the pre-gap portion of track # 1 is [0]. Therefore, when this index is detected, it is checked whether or not data other than the music signal is recorded in the pre-gap portion. Move to next step 42.

At step 42, access control means 1
5 indicates (A) output output of the output control signal, (B) stop of access operation, and (C) access operation [index 1].
Either the process of moving to the point of (1) or (D) displaying that it is a non-reproduction region is performed. The operation (A) is a process for preventing program data, image data, character data, and the like from being output as unnecessary noise when these data are reproduced as a music signal if program data, image data, character data, and the like are recorded in this section. The operation (B) is a process of stopping the reproduction, fast-forward and fast-reverse operations to prevent access to the data section other than the music signal. The operation (C) is a process of moving the light receiver / receiver 2 from the access point for reproduction, fast forward, and fast reverse to the vicinity of the [index 1] point of the track 1. The operation (D) is a process of displaying a message on the display unit inside or outside the playback device or notifying by voice that the area is a non-playback area. In addition, operation (A) ~
The item (D) is one or a combination of a plurality of items as in (A) and (D), and the main signal processing means 6 or the driving means 8 is provided.
Given to.

Here, the access control means 15 achieves the function of the control code discrimination means 15a for identifying the index number of the control code in steps 24 and 41,
In steps 25 and 42, the control code discrimination means 15a
Output control signal generating means 1 for outputting data included in the main signal to the main signal processing means 6 or for stopping the data based on the output of
Achieve the function of 5b, steps 23, 32, 36, 42
In operation key judgment means 9 and control code judgment means 1
Based on the output of 5a, the function of the access control signal generating means 15c for indicating the access position of the light receiving and emitting means 2 is achieved.

According to such an operation procedure, the access control means 15 identifies that the signal recorded in the main signal portion of the track 1 is data other than music by detecting [index 0]. You can At this time, the output control signal for instructing the reproduction of the audio signal is turned off to prevent the output of unnecessary noise, and the program data,
Image data, character data, etc. can be output independently from the playback device.

[0024]

As described above, according to the present invention, when a disc in which data other than music signals such as program data, image data and character data is recorded in the pregap portion at the beginning of a track is set in the reproducing apparatus. , Play, fast forward,
Even during an operation involving access such as fast rewind, it is possible to identify a track on which an audio signal has been recorded and reproduce only music as in the case of a music disc without reproducing unnecessary noise. Therefore, it is possible to realize a reproducing apparatus that does not reproduce unpleasant noise regardless of the type of disc.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a disc including a music signal and other data.

FIG. 3 is a flowchart (part 1) showing the operation of the reproducing apparatus in the present embodiment.

FIG. 4 is a flowchart (No. 2) showing the operation of the reproducing apparatus in the present embodiment.

5A is an explanatory diagram showing a configuration of a main signal, a sub signal, etc. of a disc, and FIG. 5B is a schematic diagram showing a format configuration of a music disc.

FIG. 6 is an explanatory diagram showing an example of TOC data of a disc.

FIG. 7 is a block diagram showing a configuration of a conventional playback device.

FIG. 8 is a flowchart showing the operation of a conventional playback device.

[Explanation of symbols]

 1, 1a CD 2 Optical receiver / emitter 3 Signal demodulating means 4 Main signal / sub signal separating means 5 Sub signal analyzing means 6a Audio signal processing means 6 Main signal processing means 8 Driving means 9 Operation key judging means 10 Playback key 11 Fast forward key 12 fast return key 15 access control means 15a control code discrimination means 15b output control signal generation means 15c access control signal generation means

Claims (2)

[Claims] 1. A reproducing apparatus for a disc having tracks on which music signals and data signals such as programs, images and characters are recorded, and a light receiving and emitting means for reading signals from each track of the disc; The drive means for rotating and driving the light receiving and emitting means to a predetermined track, the signal demodulating means for demodulating the output of the light receiving and emitting means to perform error detection and correction processing, and the output of the signal demodulating means are mainly used. A main signal / sub signal separating means for separating a signal and a sub signal, a main signal processing means for processing the main signal and outputting a music signal, and an attribute of data recorded on each track by analyzing the sub signal Indicating the control code, and an operation key for identifying the operation mode of the reproducing device by a signal from an operation key such as a reproduction key, a fast-forward key, a fast-reverse key. An output control signal for outputting an access control signal to the driving means by the judging means, the output of the operation key judging means, and the control code of the sub-signal analyzing means, and outputting the music signal to the main signal processing means. An access control means for providing the reproducing apparatus. 2. The access control means outputs a data included in a main signal to the main signal processing means based on an output of the control code determining means for identifying an index number of the control code and the control code determining means. Output control signal generating means for turning on or off, and access control signal generating means for instructing the access position of the light receiving and emitting means based on the outputs of the operation key determining means and the control code determining means. The reproducing apparatus according to claim 1, wherein: