JPH05282779A - Reproducing input/output control system - Google Patents

Abstract

PURPOSE:To reduce the capacity of a buffer memory for storing an audio signal when a still video signal and the audio signal are continuously formed and introduced by reproducing a disk stored them by a single pickup. CONSTITUTION:A system controller 9 designates a reproducing address and reads out video data or audio data with a sector unit from an optical disk 1, the video data is stored in a frame memory M with a sector unit via a data extension circuit 3, and the audio data is stored in a buffer memory 11 with a sector unit via a data processing circuit 10. The reproduced audio data is stored in the buffer memory 11 at a constant period, the audio data is read out from the buffer memory 11 without intermittence, and the audio signal is continuously formed and introduced from a DA conversion circuit 14 for audio signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction input / output control system suitable for reproducing video data and audio data from a common disk with a single pickup.

[0002]

2. Description of the Related Art JP-A-63-69062 (G11)
B20 / 02) proposes a still image disc reproducing apparatus with audio in which audio information related to still image video information is recorded in the same recording medium and video and audio are reproduced by a single pickup. This conventional technology adopts a configuration in which audio information is pre-reproduced and stored in a memory in order to derive a related audio together with a reproduced video without interruption, and the audio information stored in an arbitrary period during video reproduction is read out. ing.

[0003]

However, in this prior art, the continuous reproduction period of the audio signal is limited by the storage capacity of the memory, and it is difficult to generate video and audio continuously for a long period of time. .. Therefore, it is necessary to store both the reproduced video and the reproduced audio in a memory so that both the audio and the video can be continuously formed and derived, and the capacity of the memory for storing the audio must be minimized.

[0004]

According to the present invention, a unit image sector having a constant data amount obtained by dividing still image image information for one screen into N pieces and at least a unit image sector formed corresponding to each unit image sector. After reproducing a disk record formed by recording the unit audio sector of the data amount on the same medium, searching and reproducing the unit video sector, processing the reproduced unit video data and storing it in the frame memory, and then searching the unit audio sector. In a system for reproducing and reproducing unit audio data, storing the processed audio data in a buffer memory, and continuously reading the stored data from the buffer memory to form and derive a continuous audio signal, the frame from the start of search of the unit video sector a maximum time T ₀ required until storage completion to the memory, Yosu from the search starting of the unit audio sector until storage completion to the buffer memory The sum more audio information time T between a maximum time T _1, is characterized in that the data amount of the audio sector.

[0005]

According to the present invention, therefore, the unit audio sector is reproduced and stored in the buffer memory even during the reproduction of the unit video sector, and the audio signal is continuously formed and derived even during the display period of the still image. ..

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is applied to a still picture reproducing system for reproducing a still picture image information and audio information on a single optical disk by a single pickup to form and derive a continuous sound together with a still picture. An example to be adopted will be described. As shown in FIG. 2, the still image reproducing system of the present embodiment is a system for displaying still image images stored in a plurality of frame memories on a monitor screen by alternately switching them using an effect such as a wipe. Prior to the above, one frame of still picture image information is read from the optical disk into a vacant frame memory, and related audio is continuously formed without interruption.

Video data and audio data are recorded in sector units on the optical disk of this embodiment. Each sector is stored corresponding to an address and is composed of a unit video sector or a unit audio sector. The unit video sector corresponds to 1 / N of one frame of a still image, and N sectors form one frame of still image data. Further, the unit audio sector is formed at least corresponding to the unit video sector, and the unit audio sector corresponding to the unit video sector is associated with a common or similar address so that it is surely read back and forth. It is managed and stored in the disk.

Further, the unit audio sector is the maximum read time T ₀ required when the system reads the unit video sector.
And the audio information corresponding to a time T equal to or longer than the sum of the maximum read time T ₁ required for reading the unit audio sector. FIG. 3 is a diagram showing a video and audio reading operation along with a temporal history. As is clear from this figure, first, when reading a unit video sector, the pickup of the optical disc player searches for a reproduction address. The unit video sector detected by the search is
Played immediately. The reproduced video data is data-compressed and subjected to data expansion processing. The video data restored by this decompression process is stored in the memory. Therefore, the storage completion timing is delayed from the reproduction completion timing, and the reproduction start timing changes depending on the search time. Therefore, in the present embodiment, the read period of the unit video sector at the time of reproduction is set to the maximum read time T ₀ required for reading the unit video sector, and normally between the video storage completion timing and the audio read operation start timing. The video margin is left.

Similarly for the subsequent reading of the unit audio sector, the audio sector detected by the search is subjected to processing such as error correction after the reproduction of the unit audio data, and is stored in the buffer memory. Therefore, the reading period of the unit audio sector is set to the maximum reading time T ₁ required for reading the unit audio sector, and normally an audio margin is left from the audio storage completion timing to the next video reading operation start timing. ..

FIG. 6 is an explanatory diagram illustrating the relationship between the sector arrangement of an optical disc storing unit video sectors obtained by dividing one frame into 1/9 and reading. First, the sectors are arranged in the order of reproduction as shown in the figure. With such an arrangement, the search can be executed quickly. In this embodiment, in order to always form and derive audio, a unit audio sector is always recorded between each of the nine unit video sectors forming one frame. Further, in the portion where the video sector is not recorded, only the unit audio sector is continuously recorded. When reproducing and reading the unit sector of the data array described above, the video reading period T ₀ and the audio reading period T ₁ are set alternately. As a result, the unit video sector and the unit audio sector are alternately reproduced in the portion where the unit video sector and the unit audio sector are recorded alternately, but the video reading is performed in the portion where only the unit audio sector is recorded. The period T ₀ becomes a rest period and only the audio information is reproduced.

FIG. 1 is a circuit block diagram of the reproducing input / output system of this embodiment. This system sequentially reproduces information on the optical disk according to the information reproduction program recorded on the floppy disk to form a still image and continuous audio. First, the information reproduction program is read from the floppy disk drive 16 equipped with the floppy disk. It is read into the system controller 9. The system controller 9 executes the following control according to the information reproducing program.

First, the system controller 9 specifies to the optical disc player 1 a reproduction address for identifying a unit audio sector or a video sector. The optical disc player 1 searches for an address designated by a single built-in pickup. When the reproduction address is detected as a result of the search, the optical disc player 1 inputs the search completion output to the system controller 9 and supplies the reproduction data to the changeover switch 2.

The system controller 9 switches the changeover switch 2 to the data expansion circuit 3 side when a unit video reproduction command is issued, and activates the data expansion circuit 3 and the video storage circuit 4 immediately after the sector detection output is input. The unit video data is stored in the designated addresses of the frame memories M1 to M3. In addition, the system controller 9
When the unit voice reproduction command is issued, the changeover switch 2 is switched to the data processing circuit 10 side, and immediately after the sector detection output is input, the data processing circuit 3 and the voice storage circuit 12 are operated to unitize the unit voice data. Buffer memory 11
To memorize. The storage capacity of the buffer memory 11 is set to be slightly larger than the data amount of the unit audio data.

The audio controller 9 operates the video reading circuit 5 and the effect circuit 6 according to the information reproducing program, and the effect circuit 6 selectively switches the video data read by the video reading circuit 5. It is derived. The derived video data is converted into an analog video signal by the video DA conversion circuit 7 and supplied to the video monitor 8 for monitoring.

Further, the system controller 9 controls the reading operation described above and, at the same time, constantly generates a control output for maintaining the driving state of the audio reading circuit 13. Therefore, the audio data stored in the buffer memory 11 is constantly read out, analogized by the audio DA conversion circuit 14, and supplied to the audio monitor 15 as continuous audio.

Therefore, according to the above-mentioned embodiment, since the unit audio sector is interposed between the unit video sectors divided into nine, the unit audio data can be reproduced in a short cycle and the audio is continuously formed. Nevertheless, the storage capacity of the buffer memory can be reduced. Further, in the present embodiment, if one screen is divided into N, a reduced screen for one screen is recorded as one unit video sector, and audio information corresponding to the corresponding unit audio sector is recorded. It is possible to process video and audio that are completed in a unit sector.

FIG. 4 and FIG. 5 are explanatory diagrams for managing the reduced screen and the corresponding audio in sector units. Figure 4
Reduced video V _{11 to} V in each of 9 divided unit video sectors
FIG. 5 is an operation explanatory diagram in the case of sequentially reproducing an optical disc in which ₁₉ is recorded and corresponding audio information A _{11 to} A ₁₉ is recorded in a unit audio sector, and FIG. 5 shows a position of a reduced video screen displayed on the monitor screen. .. When reproducing the reduced video and audio as described above, in the embodiment circuit of FIG. 1, the video storage circuit 4 stores the video data only in a specific frame memory and the video read circuit 5 stores the video data. It is assumed that only the frame memory in which is stored is set to the read state, and the effect circuit 6 outputs the read data as it is.

According to this structure, the reduced image data sequentially read completes the reduced screen on the monitor screen.
Immediately after completion, the corresponding voice is formed and derived. In the case of the present embodiment, the audio corresponding to the reduced video is recorded adjacent to each sector in association with each other, and even when the reduced screen is selected and reproduced, the correspondence with the reproduced audio is not broken, and there are 9 or more types. Even if a desired video is arbitrarily selected from the reduced video, the reduced video is arranged on the monitor screen in the order of selection, and the corresponding audio is also formed and derived in order.

[0019]

As described above, according to the present invention, the capacity of the buffer memory can be reduced by frequently reproducing the audio data, and the effect is great.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a video reading period and an effect period.

FIG. 3 is an explanatory diagram showing a procedure of reading video and audio.

FIG. 4 is an explanatory diagram showing a reading order of reduced images.

FIG. 5 is an explanatory diagram showing a display state of a reduced image.

FIG. 6 is an explanatory diagram showing sector arrangement and reproduction timing.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location H04N 5/85 Z 7916-5C 5/93 G 4227-5C

Claims (1)

[Claims] 1. A unit video sector having a constant data amount obtained by dividing one screen of still image video information into N pieces, and at least a unit audio sector having a constant data amount formed corresponding to each unit video sector. A disc record recorded on the same medium is played back, the unit video sector is searched and played back, the playback unit video data is processed and stored in a frame memory, and then the unit audio sector is searched and played back to process the playback unit audio data. In the reproduction input / output control system which sequentially stores the data in the buffer memory and continuously reads the stored data from the buffer memory to form and derive a continuous audio signal, storing in the frame memory from the start of searching the unit video sector. The maximum time T ₀ required for completion and the maximum time T required for completion of storage in the buffer memory from the start of searching the unit audio sector A reproduction input / output control system characterized in that audio information for a time T equal to or greater than the sum of ₁ is used as the data amount of the audio sector.