JP4394037B2 - Information recording medium playback device - Google Patents

Description

  The present invention relates to an information recording medium reproducing apparatus for reproducing information from an information recording medium such as an optical disc, and more particularly to an information recording medium reproducing apparatus that performs a search process when a reading failure occurs in an information recording medium. .

  An information recording medium playback device (hereinafter simply referred to as a playback device) reads information (for example, music information) written on an information recording medium such as an optical disk and reproduces and outputs this music information as music. Is reproduced from the SUBQ information read from the optical disc, and the reproduction time and song number information are generated and displayed.

  On the other hand, if the information storage medium is scratched or dirty, reading failure occurs at that portion. In order to deal with such reading defects, the playback device has an error correction function, and even if there are some scratches or dirt, the error correction function restores (corrects) the information and reproduces it. There is something. However, if the information recording medium has scratches or dirt that cannot be repaired by the error correction function, unsightly noise will occur during reproduction.

  In order to deal with such problems, that is, when there are scratches that cannot be repaired by the error correction function, the identification information of the recording medium and the error location are stored in advance in the nonvolatile memory, and the recording medium is reproduced. In some cases, the identification information and the error position stored in advance in the nonvolatile memory are read out, and reproduction is skipped at the error position (see, for example, Patent Document 1). That is, when reading failure occurs in the information recording medium, the reproduction is resumed after searching (for example, skipping) to a readable position.

Japanese Patent Application Laid-Open No. 2001-273730 (pages 3 to 4, FIGS. 1 to 6)

  Since the conventional playback device is configured as described above, when skipping by search, the display of the playback time described above is stopped, so that a user who is viewing music or the like is stopped. The music is interrupted and the above display time is not displayed, and the user cannot grasp the reproduction status of the information recording medium such as an optical disk.

  In other words, if the music is interrupted and the display time is not displayed during playback, the user may think that the playback device itself has failed, the user has a problem with the information recording medium, or the playback device has failed. In other words, it is difficult to tell whether or not other problems have occurred, and when a reading failure occurs due to scratches on the information recording medium, the processing status in the playback apparatus cannot be recognized.

  The present invention has been made to solve the above-described problems, and provides an information recording medium reproducing apparatus that allows a user to accurately recognize the processing status when a reading failure occurs in an information recording medium. For the purpose.

  The information recording medium playback apparatus according to the present invention displays the time from the start of playback of information as a playback time at predetermined time intervals while playing back information from the information recording medium on which information is recorded. The information recording medium reproducing device includes a reading defect detection unit that detects an information reading defect from the information recording medium, and a pseudo reproduction time that is obtained in accordance with a time interval different from a predetermined time interval when the information reading defect is detected. It is characterized by having a reproduction time calculating means and a control means for performing a skip process according to the pseudo reproduction time and displaying the pseudo reproduction time on the display unit.

  According to the present invention, when an information reading failure is detected, the pseudo reproduction time is obtained according to a time interval different from the reproduction time, the skip process is performed according to the pseudo reproduction time, and the pseudo reproduction time is displayed on the display unit. Thus, when the reading failure occurs in the information recording medium, there is an effect that the user can accurately recognize the processing status that the skip processing is performed.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an optical disk reproducing apparatus which is an example of an information recording medium reproducing apparatus according to Embodiment 1 of the present invention. The illustrated optical disk reproducing apparatus 10 includes a control device 11, a reproduction control unit 12, a motor driver 13, and a spindle. The motor 14, the pickup drive motor 15, the pickup 16, a high frequency (RF) amplifier 17, and a display unit 18 are provided (other components such as a speaker are omitted).

  When reproducing the CD 19 which is one of the optical disks, the reproduction control unit 12 controls the motor driver 13 under the control of the control device 11 to rotationally drive the CD 19 by the spindle motor 14, and the pickup drive motor 15 is also activated. By driving, the pickup 16 is moved in the up and down direction and the left and right direction indicated by solid arrows in the figure, and information (for example, music information) recorded on the CD 19 is read. Music information read from the CD 19 is amplified by the RF amplifier 17, decoded by the reproduction control unit 12, output as a music signal, and output as music (sound) from the speaker.

  By the way, TOC (Table of Contents) information (identification information) indicating the number of music information, performance time, and music number information is recorded on the CD 19, and when the music information is reproduced, the TOC information is reproduced and controlled. Given to the control device 11 from the unit 12, the control device 11 displays the music number information on the display unit 18, and at the same time, the performance time and reproduction time of the music related to the music number information (from the start of reproduction of the music) Is displayed on the display unit 18.

  As described above, if the CD 19 is scratched or the like, reading failure occurs at that portion. At this time, skip processing is performed as described later, and a pseudo reproduction time described later is displayed on the display unit 18. , Let the user recognize that skip processing is being performed.

  FIG. 2 is a block diagram showing the configuration of the control device (microcomputer) 11 and the playback control unit (signal processing IC) 12 shown in FIG. 1. The control device 11 includes the main playback control unit 21, the search control unit 22, and the TOC information. The reproduction control unit 12 includes a decoder 31, a time information extraction unit 32, a data loss detection unit (reading defect detection unit) 33, and a servo. A control unit 34 is provided. In FIG. 2, the spindle motor 14 and the pickup drive motor 15 are omitted.

  As shown in the figure, the main reproduction control unit 21 is connected to the outputs of the time information extraction unit 32 and the data loss detection unit 33, and the main reproduction control unit 21 controls the drive of the pickup via the motor driver 13 by the servo control unit 34. In addition, as will be described later, the display control unit 25 displays the song number information, the performance time, and the reproduction time on the display unit 18.

  If the CD 19 is defective in reading, that is, if there is data loss in the output from the RF amplifier 17, the data loss detection unit 33 detects the data loss and notifies the main reproduction control unit 21 to that effect. When the main reproduction control unit 21 receives data loss, the pseudo reproduction time calculation means 24 is activated. The pseudo reproduction calculation means 24 calculates the pseudo reproduction time based on the TOC information stored in the TOC information storage unit 23 as will be described later, and displays the pseudo reproduction time on the display unit 18 by the display control unit 25.

  On the other hand, the main reproduction control unit 21 controls the servo control unit 34 by the search control unit 22 according to the pseudo reproduction time given from the pseudo reproduction time calculating means, and executes the skip process.

Next, the operation will be described.
With reference to FIG. 2, the display of the reproduction time when reproducing the CD 19 (FIG. 1) will be described. Music information read from the CD 19 by the pickup 16 is given to the reproduction control unit 12 via the RF amplifier 17. In the reproduction control unit 12, the music information is decoded by the decoder 31 and given to the time information extraction unit 32. Then, the time information extraction unit 32 extracts the TOC information from the music information and gives it to the main reproduction control unit 21 of the control device 11. The main playback control unit 21 stores the TOC information in the TOC information storage unit 23 and controls the display control unit 25 according to the TOC information, and the display control unit 25 controls the above-described song number information, performance time, and playback. The time is displayed on the display unit 18.

  Now, if there is a scratch or the like on the CD 19, a reading failure occurs at that portion, and when a reading failure occurs, the pseudo reproduction time is displayed on the display unit 18 as follows. Referring also to FIG. 3, when the reading process is started, the frame reading process is performed (step ST1). As described above, the data loss detection unit 33 detects the data loss, and when a reading failure occurs, the data loss detection unit 33 notifies the main reproduction control unit 21 that the data is lost (in the case of data loss) The time information received from the time information extraction unit 32 will also be interrupted).

  When the frame reading process is performed, the main playback control unit 21 determines whether or not the reading has failed (step ST2). On the other hand, if no data loss is received, it is determined that the data is normal, the buffer transfer process (step ST3) is performed to reproduce the music, and the process returns to step ST1.

  If it is determined that the reading has failed, the main reproduction control unit 21 activates the pseudo reproduction time calculation means 24 and calculates the pseudo reproduction time by the pseudo reproduction performance time calculation means 24. As shown in FIG. 4, the pseudo reproduction time calculation unit 24 includes a time comparison unit 41, a track (Tr) time conversion unit 42, and a pseudo reproduction time calculation unit 43. The pseudo reproduction time calculation unit 43 performs pseudo reproduction. The pseudo playback time is calculated as time = current disc (CD) playback time + n seconds (n is a positive number: step ST4). This pseudo playback time is the time on the disk (disk time), and the pseudo playback time is given to the main playback control unit 21 and the time comparison means 41.

  The time comparison unit 41 reads the TOC information from the TOC information storage unit 23, sets i (variable) = TOC last track (Tr) (step ST5), and Tr start time [i-1] ≦ pseudo reproduction time. (Step ST6). That is, the time comparison means 41 searches the current music number by comparing the head time of each song in the TOC information with the pseudo playback time based on the pseudo playback time.

  In step ST6, if Tr start time [i-1]> pseudo reproduction time, the time comparison means 41 sets i = i-1 (step ST7), and executes step ST6 again. On the other hand, if Tr start time [i−1] ≦ pseudo reproduction time, the time comparison means 41 sets track number = i (step ST8). That is, the searched song number is set as the current song number.

  Subsequently, the track time conversion means 42 obtains track reproduction time = pseudo reproduction time−Tr start time [i−1] (conversion to track time (step ST9)), that is, pseudo reproduction time and The difference from the searched start time of the current song is set as the track playback time. Then, the track time conversion means 42 outputs the song number and the track reproduction time to the display control unit 25 (display time update request: step ST10). The display control unit 25 displays the song number and the track reproduction time on the display unit 18 in response to the display time update request.

  On the other hand, when the main reproduction control unit 21 receives the pseudo reproduction time from the pseudo reproduction time calculating unit 43, the search control unit 22 controls the servo control unit 34 to perform search control (skip processing) based on the pseudo reproduction time. (Search for pseudo reproduction time: step ST11). Then, the process returns to step ST1.

  In this way, when a reading failure occurs in the CD 19, the playback time is displayed on the display unit 18 in accordance with the pseudo playback time, so that the user performs skip processing according to the playback time displayed on the display unit 18. Can be easily recognized. At this time, the above-described pseudo reproduction time is set to a number of seconds other than 1 second. For example, if the pseudo playback time is 3 seconds, the playback time displayed on the display unit 18 is not updated every second, and the user is not normally playing back, that is, skip processing is being performed. Can be easily recognized.

  In other words, if the pseudo playback time is 1 second, when the skip process occurs continuously at 1 second intervals, the user is updated normally every second, so that the playback sound is output normally. It will be mistaken that there is a failure that will not be done.

  In the above example, when the user performs a stop operation during the skip process, the main playback control unit 21 sets the resume time (next playback start position) as the current simulated playback time. In this way, the reproduction process is performed from the part after the skip process has already been performed, and as a result of skipping the previous skip process, it is possible to shift to a normal reproduction process in a short time. It will be possible.

  The display of the playback time corresponding to the pseudo playback time is also performed in the fast forward mode and the fast reverse mode. When the user performs a stop operation in the fast forward mode or the fast reverse mode, the main playback control unit 21 starts the display. Let time be the current simulated playback time. As a result, when the reproduction is performed again, the reproduction process is performed from the portion after the skip processing has already been performed.

  When the user performs a pause operation during the skip process, the main playback control unit 21 considers the position indicated by the pseudo playback time as the pause position. In this way, at the time of the next reproduction process, the reproduction process is performed from the portion after the skip process.

  In addition, if a skip process occurs while the remaining disk playback time is displayed, the pseudo playback time calculating means 24 determines the remaining disk playback time as the difference between the total playback time of the disk and the pseudo playback time. Update the display.

  In the current song repeat mode, when a song change is detected when the song number is searched in the above-described steps ST5 and ST6, it is determined that the playback song has ended, and a search is performed at the beginning of the current song (playback song). Do. Further, in the random mode, when a song change is detected when the song number is searched in the above-described steps ST5 and ST6, it is determined that the reproduction song has ended, and the process proceeds to random song selection.

  When calculating the in-track time (P-TIME), the difference between the track start time of the track number obtained from the track start time in the TOC information and the time added due to poor reading due to CD scratches, etc. Ask for. For example, the skip time is read time + skip amount, and when searching for a playback track, the track start time is searched from the TOC information based on the skip time, and the playback time = skip time−track start time is obtained. It is done.

  If it is determined that there is a song change by comparing the current playback song number with the song number obtained by the playback track search, the track number display is updated to notify the user that the song has changed. Further, when skip processing is continuously performed and the end of the session or the end of the disc is detected, it is assumed that the playback position is at the end of the session or the end of the disc, and processing such as pause, track up, or disc change is performed. .

  Furthermore, when all of the songs are skipped, the corresponding song numbers may be stored, and the next song may be skipped in units of songs at the next playback. Alternatively, the skip time, that is, the pseudo reproduction time may be changed according to the number of skip processes.

  As is clear from the above description, the main reproduction control unit 21, the search control unit 22, the display control unit 25, and the servo control unit 34 collectively function as control means.

  As described above, according to the first embodiment, when a reading failure from a disk is detected, a pseudo reproduction time (for example, every 2 seconds) different from the reproduction time (for example, every 1 second) is obtained. Since the skip process is performed according to the pseudo playback time and the pseudo playback time is displayed on the display unit, when the reading failure occurs on the disc, the user accurately recognizes the processing status that the skip process is being performed. can do.

  According to the first embodiment, the current song is searched by comparing the head time and the pseudo playback time of each song according to the TOC information written on the disc and the pseudo playback time, and the pseudo playback time and the search are searched. The difference between the current track start time and the track playback time is obtained as the track playback time, and the track number and track playback time are displayed on the display unit, so the user can easily recognize that the track has changed during the skip process. There is an effect that can be done.

  According to the first embodiment, when the skip process is continuously performed, the interval of the pseudo reproduction time is changed, so that the user easily recognizes that the skip process is continuously performed. be able to.

  According to the first embodiment, when skip processing is performed over one entire song, the song number of the song is recorded, and when the disc is reproduced again, the recorded song number is changed. Since the entire song is skipped, there is an effect that normal playback can be performed in a short time.

It is a figure which shows the optical disk reproducing | regenerating apparatus which is an example of the information recording medium reproducing | regenerating apparatus by Embodiment 1 of this invention. It is a block diagram which shows the structure of the control apparatus (microcomputer) and reproduction | regeneration control part (signal processing IC) shown in FIG. 3 is a flowchart for explaining a process when a reading failure occurs in the optical disc playback apparatus shown in FIG. 1. It is a block diagram which shows the structure of the pseudo reproduction time calculating means shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical disk reproducing device, 11 Control apparatus (microcomputer), 12 Playback control part (signal processing IC), 13 Motor driver, 14 Spindle motor, 15 Pickup drive motor, 16 Pickup, 17 High frequency (RF) amplifier, 18 Display part, 19 CD, 21 main playback control unit, 22 search control unit, 23 TOC information storage unit, 24 pseudo playback time calculation means, 25 display control unit, 31 decoder, 32 time information extraction unit, 33 data missing detection unit, 34 servo control unit 41 time comparison means, 42 track (Tr) time conversion means, 43 pseudo reproduction time calculation section.

Claims (5)

In an information recording medium reproducing apparatus that displays the time from the reproduction start of the information as a reproduction time at a predetermined time interval while reproducing the information from the information recording medium on which the information is recorded.
A reading failure detection means for detecting an information reading failure from the information recording medium;
When the information reading failure is detected, pseudo reproduction time calculating means for obtaining a pseudo reproduction time according to a time interval different from the predetermined time interval;
An information recording medium playback apparatus comprising: a control unit that performs skip processing according to the pseudo playback time and displays the pseudo playback time on a display unit.   2. The information recording medium reproducing apparatus according to claim 1, wherein the pseudo reproduction time calculating means obtains the pseudo reproduction time by adding a predetermined time to the reproduction time. Identification information indicating at least the number of information written in the information recording medium, the start time for each information, and information number information is recorded in the information recording medium,
Time comparison means for searching the current information by comparing the head time of each information and the pseudo playback time according to the identification information and the pseudo playback time;
Track conversion means for obtaining the difference between the pseudo playback time and the start time of the searched current information as the track playback time;
3. The information recording medium reproducing apparatus according to claim 1, wherein the control means displays the information number and the track reproduction time on the display unit.   2. The information recording medium reproducing apparatus according to claim 1, wherein the pseudo reproduction time calculating means changes the interval of the pseudo reproduction time when the skip processing is continuously performed. A plurality of information is recorded on the information recording medium,
When skip processing is performed over the entire information, the control means records the information number of the information, and the information is recorded according to the information number recorded when the information recording medium is reproduced again. 4. The information recording medium reproducing apparatus according to claim 3, wherein the whole is subjected to a skip process.

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