JP3844095B2 - Optical disc apparatus and optical disc recording method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc apparatus. And optical disc recording method For example, the present invention can be applied to a field editing system for processing a video signal obtained from a television camera at a recording site such as a performance hall. The present invention encodes the first and second video signals obtained simultaneously and in parallel and records them on one optical disc, thereby easily managing the materials based on the first and second video signals. To be able to handle.
[0002]
[Prior art]
Conventionally, in a recording site such as a performance hall, a plurality of television cameras are arranged, and each of the scenes is imaged by the plurality of television cameras. Furthermore, at the recording site, video signals obtained from the plurality of television cameras are switched by a switcher and recorded by one video tape recorder, and also recorded by a video tape recorder connected to each television camera. ing.
[0003]
[Problems to be solved by the invention]
By the way, when video signals obtained from a plurality of television cameras are switched and recorded by a single video tape recorder, the video signals recorded by this video tape recorder can be used for broadcasting as they are, but suddenly. For scenes and scenes that are difficult to predict at the recording site, there are drawbacks that are difficult to record.
[0004]
On the other hand, when the video signal of each television camera is recorded by each video tape recorder, such unexpected scenes and scenes that are difficult to predict at the recording site can be recorded without omission. In addition, the recorded contents can be re-edited in various ways, so that the usability can be improved as compared with the case where a plurality of video signals are switched and recorded by one video tape recorder.
[0005]
However, when the video signals of the respective television cameras are recorded by the respective video tape recorders in this way, there is a problem that the management of these materials becomes complicated because the materials are recorded on a plurality of recording media at the recording site. . Further, at the time of editing, it is necessary to handle materials recorded on the plurality of recording media. In this case, handling of the materials becomes complicated.
[0006]
By the way, at the editing site, a work tape is created from the recorded material tape made of magnetic tape, and an edit list (EDL: Edit Decision List) is created by offline editing using the work tape. Further, online editing work using the material tape is executed according to the editing list.
[0007]
The present invention has been made in view of the above points, and an optical disc apparatus capable of easily managing and easily handling each material based on a video signal of a plurality of channels. And optical disc recording method Is to try to propose.
[0008]
[Means for Solving the Problems]
In order to solve such a problem, in the present invention, the first video signal is subjected to data compression processing. Time code The first data processing means for generating the first encoded data including the second video signal input in parallel with the first video signal corresponds to the first data processing means. Data compression processing is performed by data processing, and the same as the first encoded data Time code And second data processing means for generating second encoded data, and assigning the first and second encoded data to each of the small areas formed by concentrically dividing the information recording surface. And recording means for recording the first and second encoded data on a single optical disk.
[0009]
If the first and second video signals are subjected to data compression processing to generate first and second encoded data, and the first and second encoded data are recorded on the optical disc, a plurality of channel video signals can be obtained. One optical disk can be recorded and managed. In addition, since the optical disk can be randomly accessed, it can be managed by an edit list and handling during editing can be improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0011]
(1) First embodiment
(1-1) Configuration of the first embodiment
FIG. 2 is a plan view showing the optical disc applied to the editing system according to the first embodiment. The optical disc 1 is housed and held in a predetermined cartridge 1A so that entry of dust or the like can be reduced. Further, when the optical disk 1 is loaded into a device such as a television camera or an optical disk device, the shutter disposed in the cartridge 1A is slid so that the information recording surface is exposed, whereby the television camera and the optical disk are formed. It can be accessed by a device or the like.
[0012]
This optical disc 1 is a rewritable so-called phase change type optical disc in which information recording surfaces are formed on both sides. A pre-groove carrying a laser beam guide groove is formed by meandering, and this pre-groove at the laser beam irradiation position is formed. The optical disc 1 can be rotated and driven under the condition that the ZCLV (Zone Constant Linear Velocity) linear velocity is constant.
[0013]
In this optical disc 1, a system data area ARS is formed on the inner circumference side. Here, the system data area ARS is concentrically divided into three areas ARSA, ARSB, and ARSC, and the management data recorded at the time of manufacturing the optical disc is recorded in the innermost area ARSA. Here, the management data includes an optimum light amount at the time of data recording on the optical disc 1, a serial number common to the optical disc 1, unique identification data assigned to the optical disc 1, and the like.
[0014]
In the subsequent outer area ARSB, management data for the digital video signal and digital audio signal recorded on the optical disc 1 is recorded. Here, the management data includes data necessary for accessing each digital video signal and digital audio signal, data necessary for decoding, data on imaging conditions, identification data indicating whether the file is editable set by the photographer, etc. Consists of.
[0015]
Of these, the data necessary for access is constituted by address information including the recording start position and recording end position of each file by the digital video signal and digital audio signal, the time code at the recording start time and the recording end time, and the like. The data necessary for decoding includes a video signal and audio signal format, audio data sampling rate, compressed / uncompressed identification data, and the like. The data of the conditions at the time of imaging is composed of the date and time when the image was taken, the location, the name of the cameraman, and the setting data of the television camera. The setting data is the white balance, gain, and audio signal level setting set for the television camera. Aperture data and the like are recorded. Thereby, in the optical disc 1, the history of each file recorded on the optical disc 1 can be confirmed by the management data recorded in the area ARSB.
[0016]
In the subsequent outer area ARSC, data for editing is recorded. Here, the editing data is recorded in a file format, and an editing list for editing each file recorded on the optical disc 1 is recorded. This edit list is formed by recording the data of the edit points set for each file in the playback order together with the transition form (for example, cut edit, cross fade, etc.) according to the time code and address. As a result, the optical disc 1 can select a desired edit list and sequentially reproduce the coverage contents recorded in accordance with the selected edit list.
[0017]
On the other hand, the outer area ARU is allocated to the user area, and a digital video signal and a digital audio signal are recorded. Here, the user area ARU is concentrically divided into small areas ARU1, ARU2,. Further, each of the small areas ARU1, ARU2,... Is concentrically divided into five areas, and the outermost area of these five areas is assigned to the recording area of the digital video signal V1, and each inner area is divided into the areas on the inner circumference side. Are assigned to recording areas for digital audio signals A1 to A4 of 4 channels, respectively. As a result, the optical disc 1 supports, for example, surrounding audio (hereinafter referred to as environmental sound) when imaging a subject, audio of commentary by an announcer, audio of commentary in various languages, background music, etc. for digital video signals. And can be recorded.
[0018]
In this embodiment, each of the small areas ARU1, ARU2,... Allocated in this way is a system of video signals input from the first and second television cameras in a cyclical manner from the outer peripheral side. It is made to be assigned to.
[0019]
FIG. 1 is a block diagram showing a recording system of an optical disc apparatus applied to this editing system. The optical disc apparatus 2 records digital video signals SVA and SVB output from two television cameras and audio signals SAA and SAB corresponding to the digital video signals SVA and SVB on the optical disc 1.
[0020]
That is, in the optical disc apparatus 2, the optical pickup 3 is moved in the radial direction of the optical disc 1 by a thread mechanism (not shown), and thereby a desired area of the optical disc 1 can be accessed. The optical pickup 3 irradiates the optical disc 1 with a laser beam, and generates and outputs a reproduction signal that is subjected to tracking control and focus control based on the light reception result of the return light and whose signal level changes according to the amount of the return light. .
[0021]
The optical pickup 3 outputs a monitor signal of the laser beam light amount whose signal level changes according to the light amount of the laser beam, and is output from the channel coding circuit 4 by controlling the servo circuit based on the signal level of the monitor signal. In response to the drive signal SR and the like, the light amount of the laser beam is intermittently raised from the light amount during reproduction to the optimum light amount for pit formation. As a result, the optical disc apparatus 2 thermally records desired data on the optical disc 1.
[0022]
At the time of this data recording, the optical pickup 3 sequentially seeks each area of the user area ARU, and in each area, the digital video signal and the digital audio signal are sequentially displaced from the outer circumference side to the inner circumference side. Thermal recording is performed on the optical disc 1. As a result, in the optical disc apparatus 2, when the optical disc 1 is rotationally driven under the condition of ZCLV, the digital video signal and the digital audio signal are sequentially received from the outer peripheral side area where data recorded at a high transfer rate can be reproduced. To be recorded.
[0023]
The spindle motor 5 rotates the optical disk 1 under the condition of ZCLV at the time of recording, and rotates the optical disk 1 under the condition that the angular speed is constant at a higher rotational speed than at the time of reproduction and recording, under the control of a servo circuit (not shown). . As a result, the optical disc apparatus 2 can intermittently process a reproduction signal obtained at a high transfer speed during reproduction to reproduce a continuous video signal and audio signal, and a waiting time generated by intermittent processing. Can be used to seek the optical pickup 3.
[0024]
The video process circuit 6A receives the digital video signal SVA output from the first television camera, corrects the signal level of the digital video signal SVA, and removes unnecessary data such as a blanking period for output. .
[0025]
The data compression circuit 7A sequentially compresses the digital video signal output from the video process circuit 6A in a format prescribed by MPEG (Moving Picture Experts Group), and outputs encoded data DVA. At this time, the data compression circuit 7A compresses the digital video signal so that the encoded data DVA has a constant data amount, for example, in units of GOP (Group Of Pictures) which is a data compression unit.
[0026]
The video process circuit 6B receives the digital video signal SVB output from the second television camera, corrects the signal level of the digital video signal SVB, and removes unnecessary data such as a blanking period for output. .
[0027]
The data compression circuit 7B sequentially compresses the digital video signal output from the video process circuit 6B in a format prescribed by MPEG and outputs encoded data DVB. At this time, the data compression circuit 7B compresses the digital video signal so that the amount of generated data is equal to the encoded data DVA.
The analog-digital conversion circuit (A / D) 8A performs an analog-digital conversion process on the audio signal SAA corresponding to the first digital video signal SVA, and outputs audio data. The audio signal SAA is obtained by, for example, a microphone arranged in a television camera that outputs the first digital video signal SVA. The analog-digital conversion circuit 8A is 48 [kHz] / Analog-digital conversion processing is performed at a sampling rate of 16 [Bit], 44 [kHz] / 8 [Bit], or the like.
[0028]
The packing circuit 9A blocks the audio data output from the analog-digital conversion circuit 8A in predetermined data units and outputs the blocks. At this time, the packing circuit 9A compresses and outputs the audio data according to the operator's selection.
[0029]
Analog-digital conversion circuit 8B performs analog-digital conversion processing on audio signal SAB corresponding to second digital video signal SVB in the same manner as analog-digital conversion circuit 8A, and outputs audio data. In the same manner as the packing circuit 9A, the packing circuit 9B blocks the audio data output from the analog-digital conversion circuit 8B in units of predetermined data and outputs the blocks.
[0030]
The memory 11 is a large-capacity buffer memory, and under the address control of the memory control circuit 10, the encoded data DVA and DVB output from the data compression circuits 7A and 7B, and the audio data DAA output from the packing circuits 9A and 9B. , DAB is taken sequentially and held temporarily. Further, the memory 11 sequentially blocks the encoded data DVA, DVB, audio data DAA, DAB at predetermined time intervals, and time-division multiplexes the encoded data DVA, DVB, audio data DAA, DAB in units of these blocks. Output. Here, this time interval is set to a period corresponding to a plurality of GOPs of the encoded data DVA and DVB. At this time, the memory 11 sequentially time-division multiplexes the encoded data DVA and DVB and the corresponding audio data DAA and DAB with a time interval sufficient for seeking the optical pickup 3 in between.
[0031]
The ECC circuit 13 adds an error correction code, a time code, etc. to the time-division multiplexed data, and then performs an interleaving process and outputs the result. At this time, the ECC circuit 13 sets 1 GOP for the encoded data DVA and DVB, and sets the data amount corresponding to the period of 1 GOP for the audio data DAA and DAB in the ECC data block as an error correction processing unit. An error correction code in the product code format is added to each ECC data block.
[0032]
The channel coding circuit 4 modulates the output data of the ECC circuit 13 by a modulation method suitable for recording on the optical disc 1, and then converts the data into serial data to generate a drive signal SR. Thus, in the optical disc apparatus 2, the drive signal SR based on the encoded data DVA, the drive signal SR based on the encoded data DVB, the drive signal SR based on the audio data DAA, and the drive signal SR based on the audio data DAB, with a predetermined time interval therebetween. Are sequentially output in a predetermined order, and the optical pickup 3 is sought in response to the output of the drive signal SR to sequentially access the corresponding area of the optical disc 1 by 2 The video signals SVA and SVB of the channels and the corresponding audio signals SAA and SAB are recorded on the optical disc 1 simultaneously and in parallel. As a result, the optical disc apparatus 2 records the materials based on the video signals SVA and SVB and the corresponding audio signals SAA and SAB on one recording medium, and accordingly, management of these materials can be simplified as compared with the related art. Has been made.
[0033]
The system control circuit 15 is constituted by a microcomputer that controls the operation of the optical disk device 2. When the optical disk 1 is loaded or when the power is turned on, the system control circuit 15 controls the servo circuit to control the optical pickup 3 of the optical disk 1. The management data 16 recorded in the system data area ARS of the optical disc 1 is obtained by seeking to the inner circumference side.
[0034]
The system control circuit 15 controls the operation of the recording system in response to the operator's operation. When the two-channel video signals SVA and SVB and the corresponding audio signals SAA and SAB are input, as described above. These video signals SVA, SVB and corresponding audio signals SAA, SAB are recorded on the optical disc 1 simultaneously and in parallel. At this time, the system control circuit 15 detects an empty area or the like of the optical disc 1 from the acquired management data 16 and controls access of the optical pickup 3 based on the detection result.
[0035]
When the recording of the video signal and the audio signal to the optical disc 1 is completed, the system control circuit 15 addresses the recording start position and recording end position of the video signal and the audio signal, and the time code at the start of recording and at the end of recording. For example, the management data is generated, and the management data is added to the management data 16 acquired from the optical disc 1. At this time, the system control circuit 15 adds management condition data by adding imaging condition data acquired from a television camera that sends out the video signals SVA and SVB, or imaging condition data input by an operator's operation. Is generated. The system control circuit 15 also assigns the audio signal sampling rate and compressed / uncompressed identification data to the management data.
[0036]
Further, the system control circuit 15 seeks the optical pickup 3 to the system data area ARS at a predetermined timing so that the management data 16 updated in this way matches the management data in the system data area ARS of the optical disc 1. The system data area ARS is updated.
[0037]
As a result, the optical disk apparatus 2 records data necessary for management of these materials on the optical disk 1 on which a plurality of materials are recorded, so that handling of these materials can be simplified.
[0038]
That is, FIG. 3 is a block diagram showing a reproduction system of the optical disc apparatus 2, and the system control circuit 15 updates the management data 16 obtained from the optical disc 1 and further updates the recording corresponding to the video signal and the like described above. Using the management data 16 as a reference, the optical pickup 3 is sought in response to the operation of the operator and the operation of the reproduction system is controlled, thereby reproducing the video signal and audio signal desired by the operator.
[0039]
Further, in this series of processing, the system control circuit 15 accepts the editing point setting by the operator and creates the editing list 17. When the operator executes a preview operation, the optical pickup 3 is sought according to the editing list 17. By controlling the operation of this reproduction system, the optical disk 1 is reproduced according to the edit list 17 and the edited result is output. Further, when the edit list is confirmed by the operation of the operator, the system control circuit 15 records the edit list 17 in the system data area ARS of the optical disc 1. As a result, the optical disc apparatus 2 records management data for managing these video signals on the optical disc 1 on which video signals of a plurality of channels are recorded, thereby improving the handling of editing work. In addition to this, the editing list is also recorded on the optical disc 1 to further improve the handling of the editing work.
[0040]
In the reproduction of the video signal and the audio signal, the system control circuit 15 seeks the optical pickup 3 at predetermined time intervals, and the area V1 where the video signal is recorded and the areas A1 to A1 where the audio signal is recorded. A4 is alternately accessed sequentially, and the video and audio signals that are reproduced intermittently and alternately in response to the access of the optical pickup 3 are output as continuous signals by the processing of the reproduction system. Further, when reproducing the video signal and the audio signal according to the edit list, the system control circuit 15 similarly seeks the optical pickup 3, and the area V1 where the video signal is recorded according to the edit list and the area A1 where the audio signal is recorded. .. -A4 are alternately accessed sequentially.
[0041]
That is, in the reproduction system of the optical disk apparatus 2, a reproduction signal RF having a higher transfer speed is obtained from the optical pickup 3 by rotating the optical disk 1 at a higher speed than during recording under the condition of a constant angular velocity. In this reproduction system, a reproduction signal processing circuit (not shown) reproduces a clock from the reproduction signal RF, and generates a digital reproduction signal by performing analog-digital conversion processing on the reproduction signal RF on the basis of this clock. Further, the playback system applies this PRML (Partial Response Maximum Likelihood) technique to process this digital playback signal, and generates playback data corresponding to the drive signal SR (FIG. 1) output from the channel coding circuit 4.
[0042]
The channel decoding circuit 20 decodes the output data of the ECC circuit 13 from the reproduction data and outputs it. The ECC decoding circuit 21 performs error correction processing on the output data of the channel decoding circuit 20 and deinterleave processing for output. In this embodiment, when the optical pickup 3 sequentially accesses the area V1 where the video signal is recorded and the areas A1 to A4 where the audio signal is recorded at predetermined time intervals, the ECC decoding circuit 21 The ECC data block based on the encoded data DVA and DVB and the ECC data block based on the audio data DAA and DAB are alternately subjected to error correction processing corresponding to the access of the optical pickup 3, and the encoded data DVA, DVB, audio Data DAA and DAB are output. At this time, the data is output at a high transfer speed corresponding to the rotational speed of the optical disc 1.
[0043]
The memory 22 is a large-capacity buffer memory, and takes in and temporarily stores the encoded data DVA, DVB and audio data DAA, DAB output from the ECC decoding circuit 21 under the address control of the memory control circuit 23. Further, the memory 22 extends the fetched encoded data DVA, DVB, and audio data DAA, DAB in the time axis and outputs them in a time-series manner.
[0044]
The data decompression circuit 24 receives the encoded data DVA and DVB that are continuous in time series via the memory control circuit 23, and decompresses and outputs the data. The video process circuit 25 adds data such as blanking to the video data output from the data decompression circuit 24, thereby reproducing and outputting the digital video signals SVA and SVB during recording.
[0045]
The depacking circuit 26 receives the audio data DAA and DAB which are continuous in time series via the memory control circuit 23, and processes and outputs the audio data DAA and DAB by data processing reverse to the packing circuits 9A and 9B. The digital / analog conversion circuit (D / A) 27 performs digital / analog conversion processing on the output data of the depacking circuit 26, thereby reproducing and outputting the audio signals SAA and SAB at the time of recording.
[0046]
(1-2) Operation of the first embodiment
In the above configuration, in the optical disc apparatus 2 (FIG. 1), when the optical disc 1 is loaded, the optical pickup 3 seeks to the inner circumference side of the optical disc 1 and is recorded in the inner circumference system data area ARS. Data 16 is obtained by the system control circuit 15. As a result, the system control circuit 15 detects the recordable area of the optical disc 1.
[0047]
In this state, for example, at a recording site such as a performance hall, the digital video signals SVA and SVB are input from the first and second television cameras arranged at predetermined locations, and the digital video signals SVA and SVB correspond to the digital video signals SVA and SVB. When the audio signals SAA and SAB are input and recording on the optical disc 1 is instructed by the operator, in the optical disc apparatus 2, the digital video signals SVA and SVB are subjected to predetermined processing by the video process circuits 6A and 6B, respectively. Then, the data compression circuits 7A and 7B perform data compression processing by the MPEG technique so that the GOP generated data amount as a data compression unit becomes equal, and are thereby converted into encoded data DVA and DVB, respectively. Further, continuous encoded data DVA and DVB are stored in the memory 11 via the memory control circuit 10.
[0048]
In parallel with the processing of the video signals SVA and SVB, the audio signals SAA and SAB are converted into audio data at a predetermined sampling rate in the analog-digital conversion circuits 8A and 8B, and then passed through the packing circuits 9A and 9B. To compressed / uncompressed audio data DAA and DAB. Further, the continuous audio data DAA and DAB obtained in this way are temporarily stored in the memory 11 via the memory control circuit 10.
[0049]
The encoded data DVA, DVB, audio data DAA, DAB temporarily stored in the memory 11 in this way is blocked at a predetermined time interval in units of GOP and time-axis compressed, and this time-axis compressed. The encoded data DVA, DVB and audio data DAA, DAB are sequentially time-division multiplexed with the time interval required for seeking the optical pickup 3 therebetween, and output to the ECC circuit 13. Further, in the ECC circuit 13, an error correction code is added in units of ECC data blocks, and then converted into a drive signal SR for the optical pickup 3 by the channel coding circuit 4. Further, the light amount of the laser beam emitted from the optical pickup 3 is intermittently raised from the light amount at the time of reproduction by this drive signal SR, whereby the first video signal SVA, the second video signal SVB, and the first video. An audio signal SAA corresponding to the signal SVA and an audio signal SAB corresponding to the second video signal SVB are sequentially and cyclically recorded on the optical disc 1 in a predetermined order.
[0050]
At this time, from the outer peripheral side of the optical disc 1 (FIG. 2), the area assigned to the video signal in the small area ARU1 assigned to the system of the first video signal SVA, assigned to the audio signal of one channel of this small area ARU1. In the drive signal SR, the area assigned to the video signal of the small area ARU2 assigned to the system of the second video signal SVB and the area assigned to the audio signal of one channel of the small area ARU2 in the drive signal SR. The optical pickup 3 seeks sequentially and cyclically according to the order, and the optical disk 1 is driven to rotate by ZCLV in response to the seek of the optical pickup 3, whereby the first video signal SVA, The second video signal SVB, the audio signal SAA corresponding to the first video signal SVA, the second Audio signal SAB corresponding to the video signal SVB are recorded in the corresponding region.
[0051]
As a result, in the optical disc apparatus 2, the video signals SVA and SVB which are inputted simultaneously and in parallel and have the same time information are recorded on the optical disc 1 which is one recording medium together with the corresponding audio signals SAA and SAB. As a result, it is possible to manage each material by the video signals SVA, SVB and audio signals SAA, SAB in a centralized manner, and the management of the material is simplified as compared with the conventional magnetic tape. The
[0052]
Further, when the recording of the video signals SVA, SVB and audio signals SAA, SAB onto the optical disc 1 is completed in this way, the management data 16 is generated by the system control circuit 15, and this management data 16 is the system data of the optical disc 1. Recorded in the area ARS. As a result, the history and the like of a plurality of materials recorded on the optical disc 1 are also recorded on the same optical disc 1, and the management of these materials is further simplified.
[0053]
That is, the optical disc 1 is brought back to the broadcasting station from the recording site and edited by the optical disc device 2 by the same optical disc device or at the recording site.
[0054]
In the editing in the optical disc apparatus 2 (FIG. 3), when the optical disc 1 is loaded, the optical pickup 3 seeks to the inner circumference side of the optical disc 1 and management data recorded in the system data area ARS on the inner circumference side. 16 is acquired by the system control circuit 15, whereby the recording position information, history, etc. of the video signals SVA, SVB, audio signals SAA, SAB recorded on the optical disc 1 are acquired in the system control circuit 15.
[0055]
When the operator gives an instruction to reproduce desired video signals and audio signals based on this history, the optical disc apparatus 2 seeks the corresponding area in the optical pickup 3 while the optical disc 1 is rotated at a high speed under the condition of a constant angular velocity. Then, a reproduction signal RF having a higher transfer speed than that at the time of recording is reproduced from an area desired by the operator. Further, the reproduction signal RF is converted into reproduction data, and encoded data and audio data are decoded from the reproduction data and stored in the memory 22.
[0056]
When a predetermined amount of encoded data or audio data is stored in the memory 22, the optical pickup 3 seeks, and audio data or encoded data corresponding to the data stored in the memory 22 is similarly received from the optical disc 1. It is reproduced and stored in the memory 22.
[0057]
The reproduction of the encoded data and audio data is alternately repeated. In the optical disc apparatus 2, the encoded data and audio data corresponding to the video signal and audio signal designated by the operator are intermittently and at a high transfer rate. It is reproduced from the optical disc 1 and stored in the memory 22.
[0058]
In parallel with the storage of such encoded data and audio data, in the optical disc apparatus 2, the data decompression circuit 24 and the depacking circuit 26 are represented by data strings in which the encoded data and audio data stored in the memory 22 are continuous. Are converted into the original video signal SVA or SVB and the audio signal SAA or SAB, respectively. As a result, an edit point is sequentially set by the operator by the reproduced video signal SVA or SVB and audio signal SAA or SAB, and an edit list 17 based on the edit point is created by the system control circuit 15.
[0059]
When the edit list 17 is created in this way and the operator instructs the preview, the optical pickup 3 seeks in the order in accordance with the edit list 17 in the optical disc apparatus 2 and, according to the edit list, as in the above-described reproduction. In order, encoded data and audio data are alternately reproduced at a high transfer rate intermittently from the optical disc 1. Further, the reproduced encoded data and audio data are temporarily stored in the memory 22 and output to the data decompression circuit 24 and the depacking circuit 26 as a continuous data string, thereby reproducing the video signal reproduced in the order according to the edit list. And an audio signal are output.
[0060]
As a result, the operator manages a single optical disc, and edits a video signal of a plurality of channels by simple handling in which the single optical disc 1 is loaded into the optical disc apparatus 2 and an edit point is set. You can also check the editing results.
[0061]
Thus, an editing operation is executed again as necessary according to the editing result, and in the optical disc apparatus 2, the editing list 17 is updated by the system control circuit 15 in response to the editing point change by the operator. When the edit list 17 is finalized, the optical pickup 3 seeks the system data area ARS of the optical disc 1 under the control of the system control circuit 15 in response to the operator's operation, and this edit is performed while the optical disc 1 is driven to rotate by ZCLV. List 17 is recorded in system data area ARS.
[0062]
As a result, in the optical disc 1, the video signals SVA are recorded on the optical disc 1 in which the video signals SVA, SVB and the corresponding audio signals SAA, SAB which are input simultaneously and in parallel and have the same time information are recorded. SVB, audio signal SAA, SAB edit list is recorded, and handling of each material by the video signal SVA, SVB, audio signal SAA, SAB is further simplified.
[0063]
That is, by loading the optical disc 1 having the edit list 17 recorded in this manner into an online optical disc apparatus and reproducing the material of the optical disc 1 according to this edit list, the edit result can be output online. The process from recording to program transmission can be executed by one recording medium.
[0064]
(1-3) Effects of the first embodiment
According to the above configuration, the video signals SVA and SVB input simultaneously in parallel are encoded and recorded on the optical disc 1, so that they are input in parallel and have the same time information. The video signals SVA and SVB can be centrally managed and handled by one recording medium.
[0065]
At this time, the video signals SVA and SVB are data-compressed so that the data amounts of the encoded data DVA and DVB are equal, so that any of the video signals SVA and SVB is selected and edited as necessary. be able to. Thereby, for example, it can be applied to a baseball broadcast, and for example, a scene of a home run can be confirmed later by various camera work. Further, for example, like the multi-angle of DVD, both of these two video signals can be selected and edited.
[0066]
In addition, by recording the management data of these video signals on the optical disc 1, and also by recording the edit list on the optical disc 1, the process from recording to program transmission can be executed with one recording medium. As a result, management and handling can be simplified as compared with the prior art. By the way, if the edit list is also recorded on one optical disc 1, multi-angle editing is performed by managing the edit list because video signals of a plurality of channels managed by the same time code are recorded on one recording medium. It is thought that the work can be simplified.
[0067]
Furthermore, when the contents recorded on the optical disk 1 are simply confirmed by assigning the first and second video signal systems to the small areas obtained by concentrically dividing the information recording surface, You can access and check the contents of each channel. For unnecessary channels, desired data can be overwritten in each small area, and the information recording surface can be used effectively.
[0068]
(2) Second embodiment
FIG. 4 is a block diagram showing a recording system of the optical disc apparatus according to the second embodiment. In this embodiment, video signals input simultaneously and in parallel are data-compressed so as to have different encoded data amounts by data compression, and recorded on one optical disc 41. In this optical disk device 40, the same components as those of the optical disk device 2 described above with reference to FIG.
[0069]
The optical disk device 40 records digital video signals SVA and SVC on the optical disk 41. Among these, the digital video signal SVC is a video signal accompanying the main digital video signal SVA, and is a video signal in which deterioration in image quality is not a problem. In this embodiment, the digital video signal SVC This is a digital video signal constituting the caption of this video.
[0070]
The optical disc apparatus 40 receives audio signals SAA and SAC, and the audio signal SAC is an audio signal accompanying the main audio signal SAA and is an audio signal that does not cause much deterioration in sound quality. In the embodiment, the audio signals SAA and SAC are in a relationship between main audio and sub audio in so-called audio multiplex broadcasting.
[0071]
The data compression circuit 7C compresses the digital video signal SVC input via the video process circuit 6C using the MPEG technique, and outputs encoded data DVC. At this time, the data compression circuit 7C compresses the digital video signal SVC so that the generated data amount becomes 1/10 or less as compared with the data amount of the encoded data DVA by the main video signal SVA.
[0072]
The analog-digital conversion circuit 8C performs analog-digital conversion processing on the audio signal SAC at a lower rate than the main audio signal SAA, as selected by the operator. Further, the packing circuit 9C compresses the output data of the analog-to-digital conversion circuit 8C at a data compression rate higher than that of the main audio signal SAA, as selected by the operator.
[0073]
FIG. 5 is a block diagram showing a video signal reproduction system of the optical disc apparatus 40. As shown in FIG. In this optical disk device 40, the same components as those of the optical disk device 2 described above with reference to FIG.
[0074]
In this optical disc apparatus 40, as in the optical disc apparatus 2 according to the first embodiment, the management data 16 is acquired from the optical disc 41, and the optical disc 41 is reproduced by an operator's operation according to the management data 16. Thus, the edit list 17 is created. Here, since the main video signal SVA and the sub video signal SVC accompanying the main video signal SVA are recorded on the optical disc 41, the editing operation is performed on the main video signal SVA. Will be.
[0075]
When the operator instructs a preview or outputs an editing result, the system control circuit 15 sequentially seeks the optical pickup 3 in accordance with the editing list, whereby the encoded data DVA by the main video signal SVA and the sub video are recorded. The encoded data DVC and the audio data DAA, DAC by the signal SVC are sequentially and cyclically reproduced.
[0076]
At this time, in accordance with the edit list 17, the system control circuit 15 receives the encoded data DVC, audio data DAA, and DAC by the secondary video signal SVC to which the same time code as the encoded data DVA by the main video signal SVA is assigned. Play sequentially and cyclically.
[0077]
The memory 22 temporarily stores the encoded data DVA, the encoded data DVB, the audio data DAA, and DAC that are input in this way, and outputs them simultaneously and in parallel by corresponding timing. The data decompression circuit 24C decompresses and outputs the sub-encoded data DVC, and the effector 43 converts the video generated from the sub-encoded data DVC into the main video signal SVA output from the data decompression circuit 24. The signal SVC is superimposed and output.
[0078]
As a result, in this embodiment, the subtitle is superimposed on the image by the main video signal SVA by the sub video signal SVC, and the digital video signal DV is output.
[0079]
Note that an audio signal signal processing system (not shown) in this embodiment performs digital-to-analog conversion processing on two sets of audio data output simultaneously and in parallel, and outputs the two sets of audio signals.
[0080]
According to the configuration shown in FIGS. 4 and 5, the main video signal and the accompanying sub video signal may be simultaneously processed in parallel and recorded on the optical disc 1, or the audio signals SAA and SAB may be recorded. Even if these are recorded simultaneously, management and handling of these materials can be simplified.
[0081]
At this time, the information recording surface of the optical disc 41 can be effectively used by compressing the sub video signal by changing the amount of generated data.
[0082]
At this time, by recording the management data and the edit list together, it is possible to easily edit the corresponding sub video signal SVC and audio signals SAA and SAC by editing the main video signal SVA. , The usability can be further improved.
[0083]
(3) Other embodiments
In the above-described embodiment, the case where two-channel video signals and audio signals are recorded simultaneously in parallel has been described. However, the present invention is not limited to this, and two or more channels of video signals and audio signals are simultaneously parallel-recorded. Therefore, the present invention can be widely applied to the case where recording is performed.
[0084]
Further, in the above-described embodiment, the case where the information recording surface of the optical disk is concentrically divided into small areas and each small area is sequentially assigned to the first video signal system and the second video signal system has been described. However, the present invention is not limited to this. For example, encoded data and audio data time-division multiplexed by an error correction processing unit and a data compression unit are recorded on an optical disc as they are by this time-division multiplexed data stream. These video systems may be recorded on an optical disk.
[0085]
In the above-described embodiment, the case of recording / reproducing with one optical pickup has been described. However, the present invention is not limited to this, and an audio signal and a video signal may be reproduced with a plurality of optical pickups. .
[0086]
In the above embodiment, the case where the video signal and the audio signal are sequentially and sequentially recorded from the outer peripheral side has been described. However, the present invention is not limited to this, and when a sufficient data transfer speed can be ensured, Recording may be performed from the inner circumference side where data can be stably reproduced with little surface blurring, or may be recorded discretely with a certain area in between in relation to address management.
[0087]
Further, in the above-described embodiment, the case where the system data area is formed on the innermost periphery has been described. However, the present invention is not limited to this, and various areas can be set as necessary. Similarly, the system data area can be set to various areas.
[0088]
Further, in the above-described embodiment, the case where the optical disk is driven under the condition of ZCLV to record a digital video signal and the like and is reproduced under the condition of the constant angular velocity has been described. However, the present invention is not limited to this. When a magneto-optical disk is applied as a recording medium and a sufficient recording capacity can be secured, the optical disk may be driven under the condition of a constant angular velocity in both recording and reproduction. Even when a phase change type optical disk is used, if desired data can be reliably recorded even with linear velocities different between the inner and outer circumferences by controlling the amount of laser light, the angular velocity is constant for both recording and reproduction. The optical disk may be driven.
[0089]
In the above-described embodiment, the case where the digital video signal is compressed by MPEG and recorded on the optical disc has been described. However, the present invention is not limited to this, and the present invention is also applicable to the case where data is compressed and recorded by various methods. Can be widely applied.
[0090]
Further, in the above-described embodiment, the case where the digital video signal and the digital audio signal are recorded on the phase change type optical disc that can be recorded on both sides has been described. However, the present invention is not limited to this, and the light that can be recorded on both sides is recorded. A magnetic disk or a write-once type optical disk may be used. If a sufficient recording capacity can be secured, only one side may be used.
[0091]
In the above-described embodiment, the case where the present invention is applied to an optical disc apparatus that records a video signal input from a television camera has been described. However, the present invention is not limited to this and is integrated with a television camera. Thus, the present invention can be widely applied to an optical disc apparatus or the like for recording a video signal obtained from the television camera and an externally input video signal.
[0092]
【The invention's effect】
As described above, according to the present invention, the first and second video signals are encoded and recorded on the optical disc simultaneously and in parallel, so that the material based on the first and second video signals is recorded on one optical disc. Can be easily managed and handled easily.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a recording system of an optical disc apparatus according to a first embodiment of the present invention.
FIG. 2 is a plan view showing an optical disc applied to the optical disc apparatus of FIG.
FIG. 3 is a block diagram showing the reproduction system of FIG. 2;
FIG. 4 is a block diagram showing a recording system of an optical disc apparatus according to a second embodiment of the present invention.
5 is a block diagram showing the reproduction system of FIG. 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,41 ... Optical disk, 2, 40 ... Optical disk apparatus, 3 ... Optical pick-up, 7A, 7B, 7C ... Data compression circuit, 10, 23 ... Memory control circuit, 11, 22 ... Memory, 15 ... ... system control circuit, 24, 24C ... data decompression circuit, ARS ... system data area, ARU ... user area

Claims (10)

First data processing means for generating first encoded data having a time code by performing data compression processing on the first video signal;
The second video signal input in parallel with the first video signal is subjected to data compression processing by data processing corresponding to the first data processing means, and the same time as the first encoded data. a second data processing means for generating a second coded data having a code,
The first and second encoded data are assigned to each small area formed by concentrically dividing the information recording surface, and the first and second encoded data are recorded on one optical disk. An optical disc apparatus comprising: a recording unit. The first and second data processing means are:
The optical disc apparatus according to claim 1, wherein the first and second video signals are data-compressed so that the first and second encoded data have the same data amount. The second data processing means includes
The data compression of the second video signal is performed so that the data amount of the second encoded data is lower than the data amount of the first encoded data. Optical disk device. In a predetermined area of the optical disc,
The optical disc apparatus according to claim 1, wherein management data of the first and second encoded data is recorded. In a predetermined area of the optical disc,
The optical disc apparatus according to claim 1, wherein an edit list recording area is formed by the first and second encoded data. A first data processing step of generating a first encoded data having a time code by subjecting the first video signal to data compression processing;
The second video signal input in parallel with the first video signal is subjected to data compression processing by data processing corresponding to the first data processing step, and is the same as the first encoded data. A second data processing step of generating second encoded data having a time code ;
The first and second encoded data are assigned to each small area formed by concentrically dividing the information recording surface, and the first and second encoded data are recorded on one optical disk. An optical disc recording method comprising: a recording step. The first and second data processing steps include:
7. The optical disc recording method according to claim 6, wherein the first and second video signals are data-compressed so that the first and second encoded data have the same data amount. The second data processing step includes:
The data compression of the second video signal is performed such that the data amount of the second encoded data is reduced as compared with the data amount of the first encoded data. Optical disc recording method. In a predetermined area of the optical disc,
The optical disc recording method according to claim 6, wherein management data for the first and second encoded data is recorded. In a predetermined area of the optical disc,
The optical disc recording method according to claim 6, wherein an edit list recording area is formed by the first and second encoded data.

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