JPH04291077A - Recording medium reproducing device - Google Patents

Abstract

PURPOSE:To allow the easy confirmation of the audio signals recorded on a recording medium even in the absence of a jacket, etc., and selection by displaying the title reproduced from the recording medium. CONSTITUTION:The users' bits R to W outputted from an EFM demodulating circuit 26 are inputted to a users' bit processing section 35. The users' bit processing section 35 successively stores the inputted users' bits R to W to a RAM 36 and processes one-pack component (24 symbolters) as a unit. The titles of respective pieces of the music processed in such a manner are read out of the RAM 36 and are written into a graphic memory 38 via a graphic processing section 37. The above-mentioned operations are executed at every top of respective pieces of the music of a CD and all the times of the respective pieces of the music are eventually recorded. The graphic processing section 37 reads out the titles stored in the graphic memory 38 and displays the titles on a display section 40 via a display driving section 39.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium reproducing apparatus, typified by a compact disc player, for reproducing a compact disc (CD) on which audio signals and corresponding graphics data are stored.

0002

2. Description of the Related Art CDs have a large capacity and can record many songs. Furthermore, since high-speed random access is easy, a desired song can be selected from among many songs and played quickly. Because it has such characteristics,
Recently, so-called karaoke machines using CDs have become popular.

[0003] In a karaoke device, the user selects a desired song, but in order to perform this song selection operation, the user must know the songs recorded on the disc.

[0004] For this reason, a track index is generally printed on the jacket attached to the case in which the CD is stored, and the user looks at this jacket and selects the desired track.

[0005]

[Problem to be Solved by the Invention] However, this method of selecting songs while looking at the jacket has the risk of losing the jacket or mixing it up with the jacket of another disc, causing confusion in the song selection operation. was.

[0006] Particularly in recent years, magazine-type CD players have been known in which a plurality of discs are loaded into a magazine and can play one disc in the magazine, but it is difficult to remember which disc is loaded in the tray in the magazine. Otherwise,
The corresponding jacket index is not available.

The present invention has been made to overcome these conventional problems, and an object of the present invention is to provide a recording medium reproducing apparatus that can easily and reliably know the recorded contents of a recording medium to be reproduced. .

[0008]

[Means for Solving the Problems] A recording medium reproducing apparatus according to claim 1 includes a reproducing means for reproducing a recording medium on which a plurality of audio signals are recorded together with graphics data indicating a title; The apparatus is characterized by comprising a display means for displaying the information, and a control means for reproducing and displaying the title of the audio signal before the reproduction of a predetermined audio signal of the recording medium is started.

The recording medium reproducing apparatus according to claim 2 further comprises a storage means having an area for individually storing the titles recorded on the recording medium, and the control means causes the display means to divide the screen into a plurality of parts. The feature is that it is displayed as follows.

A third aspect of the recording medium reproducing apparatus is characterized in that the control means determines the number of divisions within one screen of the display means according to the number of audio signals recorded on the recording medium.

In the recording medium reproducing apparatus according to claim 4, when the number of titles to be displayed exceeds the number of images that can be displayed on one screen of the display means, the control means controls the display means to display the remaining titles in accordance with a command. The feature is that the output is switched to

0012

In the recording medium reproducing apparatus according to the first aspect of the present invention, the title of the audio signal recorded on the recording medium that is reproduced from the recording medium is displayed. Therefore, it becomes easy to select a desired audio signal.

In the recording medium reproducing apparatus according to claim 2, the storage means has an area for individually storing titles, and the control means divides the individually stored titles on one screen of the display means. and display at the same time. Therefore, the title can be easily confirmed.

In the recording medium reproducing apparatus according to the third aspect of the present invention, the control means determines the number of divisions of one screen of the display means according to the number of audio signals recorded on the recording medium. Therefore, even if there are many titles, they can be easily displayed.

In the recording medium reproducing apparatus according to the fourth aspect, when the number of titles to be displayed exceeds a predetermined number, the remaining titles are switched and output in accordance with a command. Therefore,
Even if there are a large number of titles, they can be easily selected and displayed.

[0016]

[Example] Prior to explaining the recording medium reproducing apparatus of the present invention, a compact disc (C
The format of D) will be explained.

FIG. 3 shows the format of data recorded on a CD. One frame consisting of 588 channel bits after EFM modulation is roughly divided into a 24-bit sync pattern as a frame synchronization signal, and one symbol (= 14 channel bits) subcode data, 12
It consists of symbols of audio data, 4 symbols of parity for error detection and correction, 12 symbols of audio data, and 4 symbols of parity. In addition,
Three bits of data called margin bits are inserted between each symbol, and the DC component is suppressed by the margin bits.

One sub-coding frame is composed of 98 sub-code frames. This situation is shown in FIG.

That is, the subcode is obtained by repeating one frame of data shown in FIG. 3 for 98 frames.
Among the 8 symbols of subcode data, the first 2 symbols are configured as a subcode sync pattern, and the bits of each symbol in the remaining 96 symbols are configured as data P to W, respectively. Among the data from P to W, P,
The Q data is called a control bit, and the R to W data are called user's bits. This P data is used as a code indicating whether it is between songs or in the middle of a song. Also Q
The data is used as a code representing the address (time code) of information recorded on the disc, the details of which are shown in FIG.

[0020] The Q data is configured in units of 96 bits. Each of these bits in turn is a flag (4 bits) that indicates information such as on/off of emphasis on audio data.
, address (4 bits) where data "0001" is currently mainly used, track number (01-99) (8 bits) indicating the song number, index code (01-99) indicating the chapter within one song. (8 bits), elapsed time within one song in minutes (PMIN) (8 bits), seconds (PSEC)
(8 bits), subcode frame (PFRAME) (
Relative time data shown in units of 8 bits), currently '
00000000" is defined as the zero code (8 bits), and the elapsed time from the start point of the disk in minutes (AMIN) (8 bits) and seconds (ASEC) (8 bits).
The AFRAME consists of absolute time data indicated in units of bits), subcode frames (AFRAME) (8 bits), and error detection codes (16 bits).

[0021] A CD is provided with a lead-in area, a program area (between the lead-in area and the lead-out area), and a lead-out area (the outermost circumference) depending on the recording position on the disc. Although the information indicated by the Q data is different in each area, the subcode information in the lead-in area is particularly
Table of Contents)
By reading this before playing the disc,
It is possible to know the total number of tracks on the disc, the total playing time, etc.

[0022] That is, in the lead-in area,
When the track number of Q data is set to "00" and the code called POINT set instead of the index code is "A0", PMIN indicates the first track number of the disk, and when it is "A1". PMIN of
is the last track number of the disc, and PMIN, PSEC, and PFRAME at "A2" are each defined to indicate the absolute time at which the lead-out area begins. Here, the TOC POINT is “A0
'', the reason why the first track number is intentionally indicated is that the first song does not necessarily have to be ``track number = 1'' according to the standard.

As a result, the number of songs recorded on the disc can be calculated from the PMIN obtained when POINT=A0 and A1, and the POINT
= PMIN, PSEC, PFRAME obtained from A2
You can find out the total playing time of the entire disc.

[0024] Also, if POINT is 01 to 99,
Since the start time (absolute time) of the track number represented by the number is indicated by PMIN, PSEC, and PFRAME, it is possible to access the track specified by the user.

Next, the user's bits R to W data will be explained with reference to FIG.

The user's bits are composed of 6 bits R to W, and 24 symbols obtained by equally dividing 96 symbols into four are treated as the minimum unit (pack) of data. Note that 4 packs (96 symbols) are referred to as a packet.

FIG. 7 shows details of one pack. The first symbol (hereinafter referred to as symbol 0) is the mode (3 bits)
and item (3 bits). Details of this mode and items will be described later.

The following symbol 1 is an instruction indicating the type of instruction, and symbols 2 and 3 are parity Q (Q0, Q1) which are error detection and correction codes for symbols 0 to 3. Symbols 4 to 19 following the parity are data fields, which are composed of graphics data and the like. Symbols 20 to 23 following the data field are parity P(P0,
P1, P2, P3).

Next, the above-mentioned modes and items will be explained. The currently defined combinations of modes and items are as follows. Mode 0 (000), item 0 (000)...ZERO
Mode Mode 1 (001), Item 0 (000)...Line Graphics Mode Mode 1 (001), Item 1 (001)...TV Graphics Mode Mode 7 (111), Item 0 (000)...User Mode Other settings Definition modes and item combinations are reserved for future use.

As is clear from this definition, if the mode is 1, the data recorded in the data field is graphics data, and conversely, if the mode is 0, it is not compatible with graphics.

FIG. 8 shows the configuration of a TV graphics mode pack of mode 1 and item 1. The data field (FIG. 7) contains graphics data.

The TV graphics mode is a mode for displaying images on the TV screen, and the number of fonts that can be displayed is 48 in the horizontal (ROW) direction and 48 in the vertical (COLUMN) direction, as shown in FIG. is 16. However, one font is added to each of the top, bottom, left and right sides of the outside of the screen area, and the image data is composed of 50 (horizontal) fonts x 18 (vertical) fonts. This outermost font is used as a pointer and is not displayed on the screen. Note that the font here is a screen configuration unit configured by arranging 6 pixels in the horizontal direction and 12 in the vertical direction.

FIG. 9 shows an example of the structure of a data field (graphics data) in the TV graphics mode.

In this embodiment, the horizontal address (ROW) is determined by symbol 6, the vertical address (COLUMN) is determined by symbol 7, and symbols 8 to
19, the photon data displayed at that address is written. Of the font data, data defined by symbol 4 is used as background color data, and data defined by symbol 5 is used as foreground color data.

FIG. 11 shows how the above-mentioned subcode changes in the recording area on the disc.

As shown in Figure (a), the CD has a lead-in area, a program area, and a program area from the inner circumference to the outer circumference.
It has a lead-out area, and in the lead-in area, "00" is set as the track number, and the relative time data monotonically increases (d in the same figure). In the program area, the track number is sequentially incremented by 1 for each program (c in the same figure).
At the beginning, an actual pause area where the P data is "1" is formed for 2 seconds or more (FIG. 2(b)). In the actual pose area, the index code is "00".
" is set, and the relative time data for this period monotonically decreases to 0 at the beginning of "01" as the index code. On the other hand, the absolute time data (e in the figure) monotonically increases from the beginning of track number "01" to the start point of the lead-out area.

The audio data (main code) and graphics data (subcode) in each track number are recorded except for the actual pause period, as shown in FIG. 2(f).

In the present invention, the title (song name) of the audio data is recorded as graphics data corresponding to the audio data of each track number.

Next, an embodiment of a compact disc player to which the recording medium reproducing apparatus of the present invention is applied will be described with reference to FIG.

The CD 21 is rotationally driven by a spindle motor 23, and information is reproduced by a pickup 22. RF reproduced and output by the pickup 22
The signal is amplified by the RF amplifier 25 and sent to the EFM demodulation circuit 26.
supplied to The EFM demodulation circuit 26 demodulates the EFM modulated recording signal from 14 bits to 8 bits of digital data, and the demodulated digital data is subjected to processing such as error detection, correction, and deinterleaving in the audio signal processing section 27. administered. The RAM 29 is a memory used for deinterleaving and the like. The digital data processed by the audio signal processing section 27 is converted into analog data by the D/A converter 28 and then sent to the audio amplifier 3.
Audio is output via 0.

On the other hand, a part of the output of the RF amplifier 25 is supplied to the servo controller 32 in order to obtain a focus error signal, a tracking error signal, etc. The servo controller 32 generates a tracking error signal, focus error signal, radial error signal, time axis error signal, etc. using a well-known method, picks up these error signals 22 (focus error signal, tracking error signal), and sends the pickup 22 to the disk. The signal is supplied to the feed motor 33 (radial error signal) and the spindle motor 23 (time axis error signal) which are driven in the radial direction to perform servo operations such as focus servo, tracking servo, carriage servo, and spindle servo. Since these various servos are well known, they will not be described in detail here.

The servo controller 32 also forcibly supplies drive current to the feed motor 33 and the pickup 22 to perform track jump and search operations, thereby moving the pickup 22 to any desired position on the disk. The position on the disk is detected from the above-mentioned absolute time or relative time.

The EFM demodulation circuit 26 supplies the P and Q data (control bits) of the subcode data to the control bit processing section 34, which reads them and controls the entire device. It is supplied to the controller 31.

Further, the user's bits R to W are demodulated in the user's bit processing section 35. RAM36
is the memory required for demodulation processing. The demodulated user bits R to W are sent to the graphic processing unit 37.
is converted into an image signal, for example, an RGB component signal, and stored in the graphic memory 38. The image data read from the graphic memory 38 is supplied to a display unit 40 such as a display via a display drive unit 39 and displayed.

The system controller 31 controls the entire apparatus according to the output of the sensor 24 that detects the presence or absence of a disk, the key input unit 41 that inputs user operation commands, and P and Q data from the control bit processing unit 34. It is something to do.

Next, the operation will be explained with reference to FIG. First, in step S201, a TOC data reading operation is performed. That is, when the sensor 24 detects that the CD 21 is mounted, the system controller 31 drives the spindle motor 23 via the servo controller 32 to rotate the CD 21. At this time, the pickup 22 is transferred to the lead-in area of the CD 21 by the feed motor 33. Then, the information in the lead-in area is reproduced by the pickup 22, and the reproduced signal is sent to the EFM demodulation circuit 26 via the RF amplifier 25.
is supplied to Control bits P and Q of the data demodulated by the EFM demodulation circuit 26 are input to the control bit processing section 34 and read. Data P and Q read by the control bit processing section 34 are supplied to the system controller 31. The system controller 31 calculates the number of songs from the track numbers recorded on the CD 21 from the input data Q, and also reads TOC data such as the start address (absolute time) of each song.

Next, the system controller 31 proceeds to step S202, reproduces the graphics data of each song, and reads the user's bits R to W of its subcode. That is, the title of each song is written in user's bits R to W at the beginning of the graphics data of each song. The system controller 31 reads and displays this title.

That is, the user's bits R to W output from the EFM demodulation circuit 26 are input to the user's bit processing section 35. The user's bit processing unit 35 sequentially stores the input user's bits R to W in the RAM 36, and processes them in units of one pack (24 symbols) as explained in FIGS. 7 and 8. The title of each song processed in this way is read out from the RAM 36 and written into the graphic memory 38 via the graphic processing section 37. The above operations are performed at the beginning of each song on the CD 21. As a result, all the titles of the songs recorded on the CD 21 are recorded in the graphic memory 38. Then, the graphic processing section 37 reads out the title stored in the graphic memory 38 and displays it on the display section 40 via the display driving section 39.

FIG. 13 shows an example of a display on the display section 40. If the number of songs recorded on the CD21 is four or less, the screen is divided into four as shown in FIG. 13(A),
Each title is displayed in each of the four divided areas. Also,
If the number of songs recorded on the CD 21 is 5 or more and 9 or less, the display is displayed as shown in FIG. 13(B). In this case, the screen is divided into nine areas, and the title of each song is displayed in each area. Furthermore, if the number of songs recorded on the CD 21 is 10 or more, as shown in FIG. 13(C), prepare multiple screens in FIG. 13(B),
Select one of the screens and display it. The selection is made by the user via the key input section 41. The system controller 31 displays a specified number of screens in a specified order in response to input from the key input unit 41.

This display operation will be described in more detail later with reference to FIG. 12.

Next, returning to FIG. 1, the system controller 31
After executing the above-described display operation in step S202, the process advances to step S203 and shifts to a standby state for music selection operation. That is, the user looks at the titles displayed as shown in FIG. 13 and selects the desired song. This selection signal is input to the system controller 31 by operating the key input section 41. In this way, when a predetermined song is specified, the system controller 31 proceeds to step S204 and moves the pickup 22 to the address where the specified song is recorded.

That is, this transfer operation is performed as follows. As mentioned above, the system controller 31
stores the absolute time of the start point of each song from the TOC data read in step S201. Then, the feed motor 33 is controlled via the servo controller 32 to move the pickup 22 at high speed in the radial direction of the CD 21.
At that time, the control bits input from the control bit processing unit 34 are read, and the absolute time at which the pickup 22 is located is detected from data Q of the control bits. Then, when the absolute time coincides with the absolute time of the starting point of the song inputted from the key input section 41, the movement of the pickup 22 is stopped.

Next, the process advances to step S205, where the playback of the song is started and the graphics data obtained from the playback signal is displayed on the display section 40.

That is, the signal reproduced by the pickup 22 is transmitted to the EFM demodulation circuit 26 via the RF amplifier 25.
supplied to Audio data demodulated by the EFM demodulation circuit 26 is supplied to an audio signal processing section 27. The audio signal processing unit 27 processes the data as necessary.
The data is stored in the AM 29 and subjected to processing such as deinterleaving, and further processing such as error detection and correction. And D/A
After converting the signal into an analog signal by the converter 28, the signal is outputted to a speaker (not shown) or the like via the audio amplifier 30.

Further, the user's bits R to W outputted from the EFM demodulation circuit 26 are processed by the user's bit processing section 35.
The image data is processed by and supplied to the graphic processing section 37. The graphics processing unit 37 writes the obtained graphics data into the graphics memory 38 and stores it therein. Further, the data stored in the graphic memory 38 is read out and output to the display section 40 via the display drive section 39 for display. In this way, the graphics data recorded corresponding to each song is displayed on the display section 40.

Next, the process advances to step S206, and it is determined whether or not the reproduction of the designated song has ended. If it has not, the process returns to step S205 and the same process is repeated. When the reproduction of the designated song is finished, the process returns to step S202 and the title display screen as shown in FIG. 13 is displayed again.

FIG. 12 shows step S202 in FIG.
2 is a flowchart showing more detailed processing.

First, in step S301, the TOC
It is determined whether the maximum track number (Tmax) obtained from Tmax is 0 or not. If not 0, step S302
The maximum track number is set as Tmax.

Next, in step S303, 1 is set as the initial value of the track number Tn to be searched, and in step S304, the number of divisions per screen and the required number of screens are determined according to the value of Tmax. That is, when Tmax=1 to 4, as shown in FIG. 13(A), when Tmax=5 to 9, as shown in FIG. 13(B), and when Tmax>9, as shown in FIG. 13(C). like,
Determine the number of separations for each screen. Then step S3
05, the track number Tn (in this case Tn=1
) is searched, the graphics data at the beginning thereof is read, and this is developed in the graphics memory 38. In step S306, Tn is incremented by one, and in step S307, Tn and Tmax are compared, and Tn
Steps S304 to S30 until exceeds Tmax
Repeat step 6.

When Tn becomes larger than Tmax, the process advances to step S308, and the graphics data stored in the graphic memory 38 is displayed on the display unit 40. In step S309, if the graphics data to be displayed spans multiple screens (the case shown in FIG. 13(C)), it is determined whether or not the user has issued a command to switch the display, and whether or not the command to switch the display has been issued is determined. If so, the area (address) of the graphics data stored in the graphics memory 38 is switched in step S310. Then, the process returns to step S308 again to display it.

[0061] The present invention has been described above with reference to a case in which it is applied to a compact disc and its player, but the present invention is applicable to various types of magnetic tapes capable of recording graphics data such as CD-ROM, CD-I, DAT, and other magnetic tapes. It can also be applied to devices that play back recording media.

[0062]

As described above, according to the recording medium reproducing apparatus according to claim 1, since the title reproduced from the recording medium is displayed, even if there is no jacket etc., the title recorded on the recording medium can be displayed. Audio signals can be easily checked and selected.

[0063] According to the recording medium reproducing apparatus according to the second aspect, since the screen is divided to display a plurality of titles, it is possible to efficiently display and confirm the plurality of titles.

According to the recording medium reproducing apparatus according to the third aspect, since the number of screen divisions is determined in accordance with the number of audio signals, display in an appropriate state can be performed in accordance with the number of titles. It becomes possible.

According to the recording medium reproducing apparatus according to the fourth aspect, since the screen is switched when there are a large number of titles, it is possible to display even a large number of titles.

[Brief explanation of the drawing]

FIG. 1 is a flowchart explaining the operation of the embodiment shown in FIG.

FIG. 2 is a block diagram showing the configuration of an embodiment of the recording medium playback device of the present invention.

[Figure 3] Conceptual diagram showing the structure of one frame of CD format

[Figure 4] Conceptual diagram showing the configuration of subcodes of CD format

[Figure 5] Conceptual diagram showing the structure of subcode Q data

[Figure 6] Conceptual diagram showing the configuration of user's bits of the subcode

[Figure 7] Conceptual diagram showing the configuration of one pack in User's Bit

[Figure 8] Conceptual diagram showing the configuration of one pack in TV graphics mode

[Figure 9] Conceptual diagram showing details of data fields in TV graphics mode

[Figure 10] Conceptual diagram explaining the number of fonts that can be displayed

[Figure 11] Conceptual diagram showing the contents of subcodes in a disc

FIG. 12 is a flowchart explaining a part of the operation of the embodiment in FIG. 1;

[Figure 13] Diagram explaining screen division

[Explanation of symbols]

21 Compact disc 22 Pickup 27 Audio signal processing section 31 System controller 34 Control bit processing section 38 Graphic memory 40 Display section

Claims (4)

[Claims] 1. Reproducing means for reproducing a recording medium in which a plurality of audio signals are recorded together with graphics data indicating the title; display means for displaying the title; A recording medium reproducing apparatus comprising: a control means for reproducing and displaying a title of the audio signal before reproduction is started. 2. The recording medium playback device further comprises a storage unit having an area for individually storing titles recorded on the recording medium, and the control unit causes the display unit to divide the screen into a plurality of parts. 2. The recording medium playback device according to claim 1, wherein the recording medium playback device displays the following information. 3. The recording medium according to claim 2, wherein the control means determines the number of divisions within one screen of the display means according to the number of audio signals recorded on the recording medium. playback device. 4. The control means is characterized in that when the number of titles to be displayed exceeds the number of images that can be displayed on one screen of the display means, the control means switches and displays the remaining titles on the display means in response to a command. The recording medium reproducing device according to claim 1.