JP3892862B2 - Information recording / reproducing device - Google Patents

Description

  The present invention relates to an information recording / reproducing apparatus for recording information such as video data and audio data on a disc-shaped information recording medium and reproducing information recorded on the information recording medium. In particular, the present invention relates to an information recording / reproducing apparatus that continuously records information on an information recording medium and simultaneously reproduces information continuously recorded.

  2. Description of the Related Art In recent years, research and development of information recording / reproducing apparatuses that continuously record information such as video data and audio data on an information recording medium and at the same time continuously reproduce the continuously recorded information has been actively conducted.

  When playback is started from the beginning of a program in the middle of recording while a program provided for a predetermined time is being recorded by such an information recording / playback apparatus, the recording start timing and playback start The difference time from the timing is the difference time between the recording end timing and the reproduction end timing. That is, after the recording of the program ends and a certain time has elapsed, the reproduction of the program ends.

  For example, as shown in FIG. 2, a predetermined program provided for two hours from 7:00 pm starts to be recorded from 7:00 pm, and playback starts from the beginning of the predetermined program one hour later, that is, from 8:00 pm When the recording is started, the recording end time of this predetermined program is 9 pm and the reproduction end time is 10 pm. If another program that you want to watch in real time is provided from 9:00 pm, whether to suspend playback of the above-mentioned predetermined program or record another program that is provided from 9:00 pm, etc. Is necessary.

  In the conventional information recording / reproducing apparatus, as described above, the difference time between the recording start timing and the reproduction start timing is directly the difference time between the recording end timing and the reproduction end timing. For example, when the second program is provided after the first program, the second program cannot be viewed in real time due to the influence of the difference time between the recording start timing and the reproduction start timing of the first program. There was a problem.

  An object of the present invention is made in view of the above-described circumstances, and reduces the difference time between the recording end timing and the reproduction end timing generated from the difference time between the recording start timing and the reproduction start timing of a predetermined program. It is an object of the present invention to provide an information recording / reproducing apparatus capable of performing the above.

  An information recording / reproducing apparatus according to the present invention includes a recording / reproducing unit for recording information on an information recording medium and reproducing information recorded on the information recording medium, and information recorded on the information recording medium by the recording / reproducing unit. And storage means for temporarily storing information reproduced from the information recording medium, and control of information recording and information reproduction timing by the recording / reproducing means, and the recording / reproducing means to the information recording medium. By temporarily storing the information to be recorded and the information reproduced from the information recording medium in the storage means, the predetermined information continuously provided from the outside is recorded on the information recording medium. Recording / reproducing control means for reproducing predetermined information.

  According to the present invention, it is possible to provide an information recording / reproducing apparatus capable of reducing the difference time between the recording end timing and the reproduction end timing generated from the difference time between the recording start timing and the reproduction start timing of a predetermined program.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of an information recording / reproducing apparatus having a time shift function according to the present invention.

  The information recording / reproducing apparatus shown in FIG. 1 includes a video A / D converter 1, an audio A / D converter 2, an MPEG2 encoder 3, a DATA encoder 4, a recording buffer 5, a modulation circuit 6, an optical head 7, and a demodulation circuit. 9, DATA decoder 10, playback buffer 11, MPEG2 decoder 12, audio D / A converter 13, video D / A converter 14, buffer controller 15, cutable data detector 16, system controller 17, and user I / F18 etc. are provided.

  The optical disk 8 as the information recording medium shown in FIG. 1 may be a magneto-optical disk or a magnetic disk. However, in this embodiment, a case where a DVD (Digital Video Disk) -RAM (random access memory) is applied as the optical disk 8 will be described.

  The video A / D converter 1 converts video information included in the recording data from an analog signal to a digital signal. The audio A / D converter 2 converts audio information included in the recording data from an analog signal to a digital signal. The MPEG2 encoder 3 compresses a digital signal provided via the video A / D converter 1 and the audio A / D converter 2. The MPEG2 encoder 3 detects the amount of movement (change information) from the recorded data. Information on the amount of motion detected by the MPEG2 encoder 3 is sent to the DATA encoder 4. The cuttable data detection unit 16 detects cutable information (information such as commercials) included in the recording data. The detection result of the cuttable information detected by the cuttable data detection unit 16 is sent to the DATA encoder 4. The digital signal compressed by the MPEG2 encoder 3 is sent to the DATA encoder 4.

  The DATA encoder 4 provides identification information indicating that cutting is possible based on the detection result sent from the cutable data detection unit 16 as part of the header information recorded in the header area. Further, the DATA encoder 4 provides identification information indicating that N-times high speed reproduction is possible based on the detection result sent from the MPEG2 encoder 3 as a part of the header information recorded in the header area. Further, the DATA encoder 4 adds an error correction code to the digital data provided from the MPEG2 encoder 3 and performs a scramble process. As a result, the DATA encoder 4 generates recording data according to the format of the DVD-RAM recording / reproducing device.

  The recording data generated by the DATA encoder 4 is temporarily stored in the recording buffer 5, subjected to modulation suitable for recording on the optical disk by the signal modulation circuit 6, and recorded on the optical disk 8 via the optical head 7. The recording buffer 5 is controlled by a buffer control circuit 15 controlled by the system controller 17.

  The data recorded on the optical disk 8 is read by the optical head 7, and the data (compressed reproduction data) read from the optical head 7 is demodulated into a digital signal via the demodulation circuit 9 and input to the DATA decoder 10. The The DATA decoder 10 performs processing such as descrambling processing, error correction processing, and extraction of identification information from the header information recorded in the header area, on the input data (compressed reproduction data). Thereafter, the data (compressed reproduction data) is temporarily stored in the reproduction buffer 11. The reproduction buffer 11 is also controlled by the buffer control circuit 15. Data output from the reproduction buffer 11 is sent to the MPEG2 decoder 12 and decompressed. The video D / A converter 14 converts video information contained in the reproduction data expanded by the MPEG2 decoder 12 from a digital signal to an analog signal. The audio D / A converter 13 converts the audio information contained in the reproduction data expanded by the MPEG2 decoder 12 from a digital signal to an analog signal.

  The identification information included in the header information extracted by the DATA decoder 10 is sent to the system controller 17. The system controller 17 controls the DATA decoder 10 and the MPEG2 decoder 12 based on this identification information. Further, the system controller 17 calculates the difference between the recording start time and the reproduction start time, and controls the selection of the system clock for thinning out the output data and reproducing the audio data according to the difference time. The part that controls the thinning out of the output data is connected to the MPEG2 decoder 12, and the part that controls the selection of the system clock for reproducing the audio data is connected to the audio A / D converter 13. A control signal output from the system controller 17 is controlled by the user I / F 18.

  Subsequently, an information recording operation and an information reproducing operation by the above-described information recording / reproducing apparatus will be described with reference to FIGS. Incidentally, FIG. 6 is a flowchart showing an outline of an information recording operation and an information reproducing operation by the information recording / reproducing apparatus.

  In the above configuration, when the recording operation is started (ST2, YES), the recording data is also input to the cuttable portion detection unit 16, and the cuttable data is detected (ST4). For example, when a movie program is recorded, an IC or the like for detecting a commercial part has already been developed, and the commercial part is detected as information that can be cut. Information detected by the cutable portion detector 16 is sent to the DATA encoder 4 in synchronization with the data. Further, the MPEG2 encoder 3 can detect the amount of movement (change information) of the recorded data (ST8), and data when the detected amount of movement is small (data that can be played back at high speed N times: below a specified level). The information detected in synchronization with the moving image information including the change information) is sent to the DATA encoder 4. Furthermore, the MPEG2 encoder 3 can detect still image information (data that can be played back at high speed N times) from the recorded data (ST8), and the detected information in synchronization with the detected data is a DATA encoder. Send to 4. The DATA encoder 4 attaches the above-described detection information to the data header portion, and generates data conforming to the format of the DVD-RAM recording / reproducing device. More specifically, identification information indicating that cutting is possible is included in the header of the storage area (sector area on the information recording medium) that is the storage destination of the cutable information detected by the cuttable detection unit 16. Is recorded (ST6). Also, N-times high-speed high-speed playback is performed in the header portion of a storage area (sector area on the information recording medium) that is a storage destination of moving picture information including still picture information detected by the MPEG2 encoder 3 and change information below a specified level. The identification information shown is recorded (ST10). Thereafter, the data is recorded on the optical disk 8 via the recording buffer 5, the modulation circuit 6, and the optical head 7.

  During continuous recording (ST12, NO), when a continuous reproduction operation is started (ST16, YES), data recording / reproducing on the optical disk is performed alternately in a time division manner. At this time, the difference time between the recording start time and the reproduction start time is calculated (ST18). Furthermore, based on the calculated difference time and total recording time, a playback method is determined from cut playback, N-times high speed playback, and frame skip playback (ST20). That is, a suitable reproduction method is determined in order to bring the recording end timing close to the reproduction end timing. Of course, the reproduction time may be shortened by combining at least two reproduction methods from the above three reproduction methods.

  For example, if recording of this program is started one hour after starting recording of the program for 2 hours, there is only 1 hour from the start of playback to the end of recording, and this 1 hour is 2 hours in total. In order to reproduce this program, extremely high-speed reproduction is required. In such a case, all reproduction methods of cut reproduction, N-times high-speed reproduction, and frame skip reproduction are adopted. In addition, when the program starts to be played 10 minutes after the start of recording of the program for 2 hours, 1 hour and 50 minutes remain from the start of playback to the end of recording. Some high-speed playback is sufficient to play a program of 2 hours in 50 minutes. In such a case, a playback method suitable for shortening about 10 minutes is selected from cut playback, N-times high speed playback, and frame skip playback.

  Data read from the optical disk 8 is input to the DATA decoder 10 via the optical head 7 and the demodulation circuit 9. The DATA decoder 10 extracts data header and header information recorded in the header part. The header information is sent to the system controller 17.

  When cut reproduction is adopted as a reproduction method (ST22, YES), the data decoder 10 is controlled while the fact that cut is possible is extracted based on the header information (identification information indicating that cut is possible) Data transfer to the reproduction buffer 11 is stopped. The main part data stored in the reproduction buffer 11 is sequentially transferred to the MPEG2 decoder 12 and passed to the subsequent video equipment as reproduction data via the video D / A converter 14 and the audio D / A converter 13. Is output. In this way, cut reproduction based on identification information indicating reproduction omission included in the header information is executed (ST24). FIG. 3 shows an example of a time shift operation in the case of reproducing by skipping a cuttable portion.

  When N-times high-speed playback is adopted as a playback method (ST26, YES), at least one of still image and moving image information including change information below a specified level is based on header information (identification information indicating high-speed playback). During extraction, the MPEG2 decoder 12 is controlled to perform N-times reproduction such as reproduction of only I pictures, and the subsequent data is reproduced as reproduction data via the video D / A converter 14 and the audio D / A converter 13. Output to video equipment. In this way, N-times high-speed reproduction based on identification information indicating high-speed reproduction included in the header information is executed (ST26). FIG. 4 shows an example of time shift operation when a still image portion is reproduced at N times speed.

  When frame skip playback is adopted as the playback method (ST30, YES), the difference time between the recording start time (recording start timing) and the playback start time (playback start timing) calculated by the system control 17 and all recording The thinning out of the output data according to the time is performed by controlling the MPEG2 decoder (ST32).

The number of frame strokes to be thinned out is calculated by the following formula.
Recording time / (Recording time + Difference time) = Thinning rate Number of frames per second × Thinning rate = Number of frames per second after thinning
Number of frames per second-Number of frames per second after decimation = Number of frames decimation
For example,
When the difference time is 20 minutes and the total recording time is 120 minutes
From the above formula
Decimation rate = 0.85714228571429
Number of frames per second after decimation = 25.71428571429
Number of frames to be thinned = 4.2857514285714
From the above, when data of about 4 frames is thinned out per second and output as playback data via the video D / A converter 14, playback can be ended almost simultaneously with the end of recording.

  Similarly, the system clock for audio data reproduction is selected by the following equation (ST32).

(Recording time + Difference time) ÷ Recording time = System clock magnification
Therefore, when using a 33MHz system clock for normal playback audio
System clock magnification = 1.166666666667
33MHz × 1.1666666666667 = 38.5MHz
By setting the system clock of the audio D / A converter 13 to 38.5 MHz, the audio reproduction can be ended almost at the same time as the end of the recording as in the case of the image reproduction. FIG. 5 shows the state of frame thinning and the change of the audio reproduction clock during frame thinning reproduction.

  When the user desires to reproduce the recorded program without changing the data, a DATA decoder 10 for controlling the system control 17 by operating the user I / F 18 to shorten the time shift interval, Control over the MPEG2 decoder 12 and the audio A / D converter 13 is prohibited.

  As described above, according to the present invention, it is possible to omit the reproduction time of a portion that can be cut from recorded data. In addition, it is possible to shorten the playback time by realizing a playback speed higher than the normal playback speed. In addition, the time shift interval of the playback end with respect to the recording end time can be omitted by omitting a still image or an image portion with little motion that is considered to have no problem even if it is played back at N times speed (N = 1 or more) in story development. Can be shortened. In addition, it is possible to play back the recorded program without changing the program.

  The above-described information recording / reproducing apparatus and information recording / reproducing method of the present invention will be summarized below.

  (1) An information recording / reproducing apparatus records information on an information recording medium, recording / reproducing means for reproducing information recorded on the information recording medium, and information recorded on the information recording medium by the recording / reproducing means. And storage means for temporarily storing information reproduced from the information recording medium, and control of information recording and information reproduction timing by the recording / reproducing means, and the recording / reproducing means to the information recording medium. By temporarily storing the information to be recorded and the information reproduced from the information recording medium in the storage means, the predetermined information continuously provided from the outside over a predetermined time is supplied to the information recording medium for a predetermined time. Recording and reproduction control for continuously reproducing the predetermined information continuously recorded on the information recording medium in a shorter time than the predetermined time. And a stage.

  (2) In the information recording / reproducing apparatus described in (1) above, when the predetermined information is recorded by the recording / reproducing means, the identification information indicating that the reproduction is omitted is added to the specific information included in the predetermined information When the predetermined information is continuously reproduced by the information adding means and the recording / reproducing control means, the identification information is detected from the predetermined information and the reproduction of the specific information is omitted, thereby shortening the predetermined time. And a reproduction control means for continuously reproducing the predetermined information.

  (3) In the information recording / reproducing apparatus according to (1) or (2), when the predetermined information is recorded by the recording / reproducing means, still image information included in the predetermined information and change information below a specified level are included. Identification information adding means for adding identification information indicating high-speed playback to at least one of the included moving image information, and when the predetermined information is continuously played back by the recording / playback control means, The predetermined information is detected by detecting the identification information, reproducing information not corresponding to the specific information at a first reproduction speed, and reproducing the specific information at a second reproduction speed higher than the first reproduction speed. Reproduction control means for continuously reproducing the predetermined information in a shorter time than the time.

  (4) In the information recording / reproducing apparatus according to (1), (2), or (3), the recording / reproducing control means starts the continuous recording start of the predetermined information and the continuous reproduction start timing of the predetermined information. And a plurality of reproduction frames reproduced from the predetermined information based on the difference time detected by the detection means and the predetermined time required for continuous recording of the predetermined information. A frame to be thinned out is determined, and a second audio reproduction clock having a higher frequency than the first audio reproduction clock when reproducing the predetermined information over the predetermined time is determined, and image reproduction by frame decimation is performed. And reproduction control means for continuously reproducing the predetermined information in a shorter time than the predetermined time by audio reproduction by the second audio reproduction clock. .

  (5) In the information recording / reproducing apparatus described in (1) above, when the predetermined information is recorded by the recording / reproducing means, the first information indicating that the reproduction is omitted with respect to the first specific information included in the predetermined information When the predetermined information is continuously reproduced by the first identification information adding means for adding identification information and the recording / reproducing control means, the first identification information is detected from the predetermined information to detect the first identification information. When the predetermined information is recorded by the first reproduction control means for continuously reproducing the predetermined information in a shorter time than the predetermined time by omitting the reproduction of the information and the recording / reproducing means, the predetermined information is included in the predetermined information. Second identification information adding means for adding second identification information indicating high-speed playback to at least one second specific information of still image information and moving image information including change information of a predetermined level or less; When the predetermined information is continuously reproduced by the recording / reproduction control means, the second identification information is detected from the predetermined information, and information not corresponding to the second specific information is reproduced at the first reproduction speed, Second reproduction control means for continuously reproducing the predetermined information in a shorter time than the predetermined time by reproducing the second specific information at a second reproduction speed higher than the first reproduction speed; Detecting means for detecting a difference time between a timing for starting the continuous recording of the predetermined information by the recording / reproducing control means and a timing for starting the continuous reproduction of the predetermined information; a difference time detected by the detecting means; Based on the predetermined time required for continuous recording, a frame to be thinned out is determined from a plurality of reproduction frames reproduced from the predetermined information, and the predetermined information is A second audio reproduction clock having a frequency higher than that of the first audio reproduction clock used for reproduction over a predetermined time is determined, and image reproduction by frame thinning and audio reproduction by the second audio reproduction clock are used to determine the predetermined audio reproduction clock. Based on the third reproduction control means for continuously reproducing the predetermined information in a shorter time than the time, the difference time detected by the detecting means, and the predetermined time required for continuous recording of the predetermined information, Selection means for selecting at least one of the first, second, and third reproduction control means and executing reproduction control.

  (6) An information recording / reproducing method controls information recording on an information recording medium and timing of reproducing information recorded on the information recording medium, information recorded on the information recording medium, and information recording medium A first step of continuously recording predetermined information provided from outside for a predetermined time on the information recording medium for a predetermined time by temporarily storing information reproduced from the storage unit; In parallel with the continuous recording in the first step, there is provided a second step in which the predetermined information continuously recorded in the first step is continuously reproduced in a shorter time than the predetermined time.

  (7) In the information recording / reproducing method described in (6) above, when the predetermined information is recorded on the information recording medium in the first step, reproduction of the specific information included in the predetermined information is omitted. When the predetermined information is continuously reproduced by the third step of adding identification information indicating the above and the second step, the identification information is detected from the predetermined information and reproduction of the specific information is omitted. The fourth step of continuously reproducing the predetermined information in a shorter time than the predetermined time.

  (8) In the information recording / reproducing method described in (6) or (7) above, when the predetermined information is recorded on the information recording medium in the first step, still image information included in the predetermined information And a third step of adding identification information indicating high-speed playback to at least one specific information of moving image information including change information below a specified level, and the predetermined information is continuously played back by the second step. The identification information is detected from the predetermined information, information not corresponding to the specific information is reproduced at a first reproduction speed, and the specific information is reproduced at a second reproduction speed higher than the first reproduction speed. And the fourth step of continuously reproducing the predetermined information in a shorter time than the predetermined time.

  (9) In the information recording / reproducing method described in (6), (7), or (8) above, the timing of continuous recording start of the predetermined information and the continuous reproduction of the predetermined information in the first and second steps. From the predetermined information, based on a third step for detecting a difference time from a start timing, the difference time detected by the third step, and the predetermined time required for continuous recording of the predetermined information. A frame to be thinned out is determined from among a plurality of reproduction frames to be reproduced, and a second audio reproduction clock having a frequency higher than that of the first audio reproduction clock when reproducing the predetermined information over the predetermined time is determined. The predetermined information is continuously reproduced in a shorter time than the predetermined time by image reproduction by frame thinning and audio reproduction by the second audio reproduction clock. And a step.

  (10) In the information recording / reproducing method described in (6) above, when the predetermined information is recorded on the information recording medium in the first step, the first specific information included in the predetermined information is recorded. When the predetermined information is continuously reproduced by the third step of adding the first identification information indicating omission of reproduction and the second step, the first identification information is detected from the predetermined information. A fourth step of continuously reproducing the predetermined information in a shorter time than the predetermined time by omitting reproduction of the first specific information, and the predetermined information with respect to the information recording medium by the first step. Is recorded, the second identification information indicating high-speed reproduction with respect to at least one second specific information of the still image information included in the predetermined information and the moving image information including the change information not exceeding the specified level. When the predetermined information is continuously reproduced by the fifth step and the second step, the second identification information is detected from the predetermined information, and the information does not correspond to the second specific information Is reproduced at a first reproduction speed, and the second specific information is reproduced at a second reproduction speed higher than the first reproduction speed, whereby the predetermined information is continuously reproduced in a shorter time than the predetermined time. A sixth step for detecting, a seventh step for detecting a difference time between a timing for starting the continuous recording of the predetermined information and a timing for starting the continuous reproduction of the predetermined information according to the first and second steps; Based on the difference time detected in step 7 and the predetermined time required for continuous recording of the predetermined information, thinning out a plurality of reproduction frames reproduced from the predetermined information Determining a frame, determining a second audio reproduction clock having a frequency higher than that of the first audio reproduction clock when reproducing the predetermined information over the predetermined time, and reproducing the image by thinning out the frame and the second Necessary for continuous recording of the predetermined time and the difference time detected by the seventh step, the eighth step of continuously reproducing the predetermined information in a shorter time than the predetermined time by the sound reproduction by the sound reproduction clock. And a ninth step of executing reproduction control by selecting at least one of the fourth, sixth and eighth steps based on the predetermined time.

It is a figure which shows schematic structure of the information recording / reproducing apparatus which has a real-time shift function based on this invention. It is a figure which shows the operation example of the conventional time shift. It is a figure which shows the example of a time shift operation | movement when skipping the part which can be cut and reproducing | regenerating by the information recording / reproducing apparatus shown in FIG. It is a figure which shows the example of a time shift operation | movement in the case of reproducing | regenerating a still image part by N times speed with the information recording / reproducing apparatus shown in FIG. FIG. 2 is a diagram showing an example of high-speed playback operation by thinning out frames and increasing the frequency of an audio playback clock by the information recording / playback apparatus shown in FIG. 3 is a flowchart showing an outline of an information recording / reproducing operation in which a real-time shift function is applied by the information recording / reproducing apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Video A / D converter 2 ... Audio A / D converter 3 ... MPEG2 encoder 4 ... DATA encoder 5 ... Recording buffer 6 ... Modulation circuit 7 ... Optical head 8 ... Optical disk 9 ... Demodulation circuit 10 ... DATA decoder 11 ... Playback buffer 12 ... MPEG2 decoder 13 ... Audio D / A converter 14 ... Video D / A converter 15 ... Buffer controller 16 ... Cutable section detector 17 ... System control 18 ... User I / F

Claims (1)

Recording and reproducing means for recording information on the information recording medium and reproducing information recorded on the information recording medium;
Storage means for temporarily storing information recorded on the information recording medium by the recording / reproducing means, and information reproduced from the information recording medium;
The timing of information recording and information reproduction by the recording / reproducing unit is controlled, and information recorded on the information recording medium and information reproduced from the information recording medium by the recording / reproducing unit are temporarily stored in the storage unit. by storing manner, while continuously recorded for a predetermined time a predetermined information provided continuously from the outside to the information recording medium for a predetermined time, the predetermined information is continuously recorded on the information recording medium Recording / playback control means for continuously playing back in a shorter time than the predetermined time ;
First identification information adding means for adding first identification information indicating omission of reproduction to the first specific information included in the predetermined information when the predetermined information is recorded by the recording / reproducing means;
When the predetermined information is recorded by the recording / reproducing means, high-speed reproduction is performed on at least one second specific information of still image information included in the predetermined information and moving image information including change information below a specified level. Second identification information adding means for adding second identification information to be shown;
Detecting means for detecting a difference time between a timing for starting continuous recording of the predetermined information by the recording / reproducing control means and a timing for starting continuous reproduction of the predetermined information;
The recording / reproducing control unit is configured to select one of the first, second, and third reproducing controls based on the difference time detected by the detecting unit and the predetermined time required for continuous recording of the predetermined information. Select and run at least one
In the first reproduction control, when the predetermined information is continuously reproduced by the recording / reproduction control means, the first identification information is detected from the predetermined information and reproduction of the first specific information is omitted. A reproduction control for continuously reproducing the predetermined information in a shorter time than the predetermined time,
In the second reproduction control, when the predetermined information is continuously reproduced by the recording / reproduction control means, the second identification information is detected from the predetermined information, and information not corresponding to the second specific information is detected. The predetermined information is continuously reproduced in a shorter time than the predetermined time by reproducing at the first reproduction speed and reproducing the second specific information at the second reproduction speed higher than the first reproduction speed. Playback control,
In the third reproduction control, the number of frames to be thinned out from a plurality of frames of the predetermined information is determined based on the difference time detected by the detection unit and the predetermined time required for continuous recording of the predetermined information. And determining a second audio reproduction clock having a frequency higher than that of the first audio reproduction clock when reproducing the predetermined information over the predetermined time, and reproducing the image by frame thinning and the second audio reproduction. Reproduction control for continuously reproducing the predetermined information in a shorter time than the predetermined time by sound reproduction by a clock;
When the difference time detected by the detection means is n hours and the predetermined time required for continuous recording of the predetermined information is 2n hours, the recording / playback control means , Select and execute all of the third playback controls.
An information recording / reproducing apparatus.

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