JP2007141310A - Information recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and reproducing device which can record and reproduce information to/from a plurality of types of recording medium without increase of hardware scale. <P>SOLUTION: A type of a loaded optical disk 114 (e.g. DVD, BD, etc.) is discriminated, and a configuration of a plurality of logic circuits in a reconfigurable circuit 106 is changed according to a program corresponding to a type of an optical disk 114. Therefore, a modulation/demodulation circuit and an error correction circuit corresponding to a type of an optical disk is built and it becomes possible to build a modulation/demodulation circuit and the error correction circuit of a different system corresponding to a plurality of types of optical disk without increase of hardware scale. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information recording / reproducing apparatus for recording or reproducing information on an information recording medium such as an optical disk, and more particularly to an information recording / reproducing apparatus suitable for recording and reproducing image data of a digital video camera.

  At present, an optical disk from a conventional magnetic recording tape is used as a recording medium of a digital video camera. Examples of a recording medium effective for a digital video camera in terms of recording capacity include a DVD and a Blu-ray-Disc (hereinafter referred to as BD).

  Comparing DVD and BD, although BD is superior in terms of recording capacity, DVD is less expensive in terms of media unit price per disc, and playback players are still widely used. is there.

  In consideration of the above situation, when using an optical disk as a recording medium for a digital video camera, it is desirable to use a video camera in which both DVD and BD can be used and the user uses DVD and BD properly in the situation.

  However, there are many differences between DVD and BD, such as the physical address structure on the disk, the reproduction signal encoding method, and the data compression method. For this reason, a signal processing system corresponding to each is required. This means that two signal processing systems corresponding to DVD and BD are required inside the video camera, and the scale of the hardware signal processing circuit block increases.

  One solution to this problem is to realize a recording / playback signal processing function by software. That is, a software program for signal processing corresponding to the type of the optical disk is stored in the internal memory, and a software program suitable for it is automatically selected according to the type of the optical disk. By doing so, it is possible to support a plurality of recording media without increasing the scale of the hardware signal processing circuit.

  However, this method may be applicable to a device that handles still images, for example, a digital camera, but is not applicable to a video camera.

In other words, a digital video camera is a device that handles moving image data. The moving image data has a much larger amount of data than still image data, and the moving image data must be recorded and reproduced in real time. Needed. For this reason, the software cannot ensure a sufficient signal processing speed necessary for the digital video camera. Therefore, in an actual digital video camera, much signal processing must be realized by hardware.
JP 9-74556 A

  As described above, since the physical address structure on the disc and the reproduction signal encoding method are completely different between the DVD and the BD, in order to support both recording media, the corresponding hardware must be provided inside. I must.

  However, this method increases the hardware scale inside the video camera, causing problems such as an increase in the price of the video camera and an increase in the size of the main body. In particular, unlike a stationary recorder, a video camera has an important issue of downsizing the main body in order to improve portability, and thus an increase in hardware scale is not desirable.

  An object of the present invention is to provide an information recording / reproducing apparatus capable of recording or reproducing information on a plurality of types of recording media without increasing the hardware scale.

  In order to achieve the above object, the present invention performs a modulation / demodulation process or an error correction process for recording or reproducing information on an information recording medium, and a modulation / demodulation method or Reconfigurable circuit having a plurality of logic circuits capable of changing the error correction method, means for determining the type of the recording medium, and modulation in the reconfigurable circuit corresponding to the type of the recording medium Corresponding to the type of the recording medium of the storage means based on the determination result of the determination means of the storage means having the program showing the configuration of the logic circuit performing the demodulation process or the logic circuit configuration performing the error correction process Select the program to be changed, change the configuration of a plurality of logic circuits in the reconfigurable circuit according to the selected program, and record the data. Characterized by comprising modulation and demodulation circuit corresponding to the type of the body, or a means for constructing an error correction circuit.

  In the present invention, the type of the information recording medium is determined, the configuration of the plurality of logic circuits in the reconfigurable circuit is changed according to the program corresponding to the type of the recording medium, and the modulation / demodulation circuit corresponding to the type of the recording medium Alternatively, an error correction circuit is constructed. By doing so, it is possible to construct modulation / demodulation circuits and error correction circuits of different systems corresponding to a plurality of types of recording media without increasing the scale of hardware.

  According to the present invention, it is possible to change the configuration of the logic circuit according to the type of the information recording medium and construct a modulation / demodulation circuit or an error correction circuit corresponding to the type of the information recording medium. Accordingly, information can be recorded or reproduced on a plurality of types of recording media without increasing the scale of the hardware circuit.

  Next, the best mode for carrying out the invention will be described in detail with reference to the accompanying drawings. Note that the dimensions, shapes, relative arrangements, and the like of the components exemplified in the present embodiment should be appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions, and the present invention is limited to these examples. It is not something. In the following embodiments, a video camera will be described as an example, but the information recording / reproducing apparatus of the present invention is not limited thereto.

  FIG. 1 is a block diagram showing a configuration of an embodiment of a video camera according to the present invention. In the figure, reference numeral 114 denotes an optical disk as an information recording medium, which can be exchanged for the video camera 115 main body. As the optical disc 114, for example, both DVD and BD can be used.

  101 is a CCD (image sensor), 102 is a DRAM (memory for camera signal processing), 103 is a DRAM (memory for FE / BE signal processing), 104 is a camera signal processing unit that processes signals from the CCD 101, and 105 is an I / F. Circuit. A detailed description of these photographing circuits and the like will be omitted.

  Further, the video camera 115 includes an optical pickup (OPU) 113 including a laser diode for DVD and a laser diode for BD, and an AFE (analog front end circuit) 112 that amplifies and processes a signal from the optical pickup 113. Yes.

  Based on the signal from the AFE 112, the detection circuit 111 determines whether the optical disk 114 is a DVD or a BD. As a determination method of the detection circuit 111, for example, there is a method of using the result because the reflectivity with respect to the laser diode is different between DVD and BD.

  For example, it is preferable to irradiate a loaded optical disk with laser light from any of the laser diodes, detect the reflected light, calculate the reflectance, and determine the type of the optical disk based on the calculation result.

  The detection circuit 111 detects whether the optical disk 114 is a DVD or a BD. The control circuit 108 instructs the selector circuit 109 to select program data corresponding to the optical disc 114 from the configuration program stored in the internal nonvolatile memory 110 based on the detection result.

  The internal nonvolatile memory 110 stores a program indicating how to connect and construct a logic circuit in the reconfigurable circuit 106 for each of DVD and BD, that is, a program indicating the configuration of the logic circuit. ing.

  The control circuit 108 constructs a logic circuit of the reconfigurable circuit 106 in accordance with program data read from the internal nonvolatile memory 110 via the selector circuit 109.

  In the reconfigurable circuit 106, a front end (FE) processing unit that performs rotation control of the optical disk 114 and data reading processing, a back end (BE) processing unit that performs compression / decompression processing of moving image / audio data, and the like. have.

  In the present embodiment, the configuration of the processing circuit related to information recording or reproduction of the reconfigurable circuit 106 can be switched corresponding to DVD and BD, respectively. For example, a video camera requires a modulation circuit / demodulation circuit that modulates a recording signal to be recorded on an optical disk and demodulates a reproduction signal reproduced from the optical disk.

  In the reconfigurable circuit 106, a plurality of logic circuits constituting these modulation / demodulation circuits are provided. Further, these logic circuits can change the circuit configuration by using a switch element or the like, and it is possible to construct modulation / demodulation circuits of different systems corresponding to the type of the medium.

  For example, when the optical disc is determined to be a DVD, it is possible to change the configuration of this logic circuit and construct an MPEG2 modulation / demodulation circuit for DVD. In this case, as described above, the nonvolatile memory 110 stores a configuration program indicating the configuration of the logic circuit corresponding to DVD and BD.

  If the disc is determined to be DVD, the control circuit 108 changes the configuration of the logic circuit in accordance with the program corresponding to the DVD in the nonvolatile memory 110, and constructs an MPEG2 modulation / demodulation circuit for DVD.

  On the other hand, if it is determined as BD, the configuration of the logic circuit is changed correspondingly, and H. H.264 modulation / demodulation circuit is constructed. Also in this case, the control circuit 108 changes the configuration of the logic circuit in accordance with the program corresponding to the BD, and the H.D. H.264 modulation / demodulation circuit is constructed.

  In addition, regarding an error correction circuit (ECC processing circuit) that performs error correction, it is possible to construct an error correction circuit for DVD and an error correction circuit for BD by similarly changing the configuration of the logic circuit. .

  Also in this case, a plurality of logic circuits constituting an error correction circuit are provided in the reconfigurable circuit 106, and the configuration of this logic circuit can be changed using a switch element or the like.

  Further, the nonvolatile memory 110 stores a configuration program indicating the configuration of the error correction circuit corresponding to DVD and BD.

  When the optical disc is determined to be a DVD, the control circuit 108 changes the configuration of the logic circuit according to a program corresponding to the DVD in the nonvolatile memory 110, and constructs an error correction circuit for the DVD. If the optical disc is determined to be BD, the control circuit 108 similarly changes the configuration of the logic circuit according to the program corresponding to the BD, and constructs an error correction circuit for BD.

  Thus, the video camera 115 according to the present invention changes the configuration of the modulation / demodulation circuit or the error correction circuit according to the type of the optical disk. By doing so, it is possible to record and reproduce information on a plurality of types of optical disks without increasing the hardware circuit scale.

  In addition, regarding the modulation / demodulation circuit and the error correction circuit, it has been described that the circuit for DVD and BD is constructed by changing the configuration of the logic circuit, but the present invention is not limited to this. Similarly, with respect to the circuits in the front end (FE) processing unit, the configuration of the hardware can be simplified by changing the configuration of the logic circuit.

  Further, the recording medium is not limited to DVD or BD, and other optical discs can be used in the present invention. For example, it is possible to use a CD and a DVD. Even in that case, the configuration of a large number of logic circuits necessary for configuring the target circuit in the reconfigurable circuit 106 can be changed using switch elements or the like.

  The nonvolatile memory 110 stores a configuration program indicating the configuration of the target circuit corresponding to the CD and the DVD. Then, the circuit for CD and DVD is constructed by changing the configuration of the logic circuit according to the program corresponding to each of CD and DVD.

  Further, in the case of using a CD and a DVD, if it is difficult to discriminate the recording medium based on the reflectance with respect to the laser diode, the medium may be discriminated using a difference in physical address on the optical disc. That is, the disc type can be easily determined from the disc format difference.

  Further, as described above, the reconfigurable program necessary for reconfigurable is stored in the internal nonvolatile memory 110. At that time, the data may be rewritten via the Internet or downloaded from an external device such as a personal computer. Furthermore, data can be read from the optical disc, or data can be rewritten by reading data from other recording media (for example, a card-type memory).

  FIG. 2 is a perspective view showing the appearance of the video camera according to the present invention. In the figure, reference numeral 201 denotes an optical disk storage unit for storing the optical disk 114, and the optical disk can be exchanged by opening and closing the lid. An opening / closing control unit that controls opening / closing of the optical disk storage unit 201 is provided in the video camera 115.

  FIG. 3 is a block diagram showing an embodiment including an opening / closing controller of the present invention. In FIG. 3, the same parts as those in FIG. 3 shows only a part of FIG. 1, and the CCD 101, the DRAMs 102 and 103, the camera signal processing unit 104, the I / F circuit 105, and the like are omitted.

  In FIG. 3, an open / close control unit that controls the open / close of the optical disc storage unit 201 is 302, and the open / close control unit 302 is controlled by the MPU 107.

  The optical disk 114 can be inserted into and removed from the optical disk storage unit 301 only when the power is turned on. That is, the optical disc storage unit 201 is provided with a lock mechanism (not shown), and the optical disc 114 can be exchanged by releasing the lock mechanism only when the power is turned on under the control of the opening / closing control unit 302 as described above. When the power is turned off, the lid of the optical disc storage unit 201 is locked by the lock mechanism. When the power is turned off, the MPU 107 stores the type of the optical disk 114 as data in the internal nonvolatile memory 110.

  On the other hand, when the power of the video camera is turned on, the MPU 107 reads data indicating the type of the optical disk from the internal nonvolatile memory 110. Accordingly, the selector circuit 109 is controlled and the logic circuit of the reconfigurable circuit 106 can be constructed faster than the detection circuit 111 detects the type of the optical disk via the AFE 112.

  In addition, once the logic circuit of the reconfigurable circuit 106 is constructed at the time of power-on, it is not necessary to rebuild the logic circuit of the reconfigurable circuit 106 unless the type of the optical disk changes thereafter.

  Therefore, the detection circuit 111 is controlled in accordance with the control of the opening / closing control unit 302 that performs opening / closing control of the lid of the optical disc storage unit 201 when the power is turned on. That is, the optical circuit 114 is discriminated by the detection circuit 111 only when the power is turned on, and the logic circuit of the reconfigurable circuit 106 is constructed only when the optical disk is replaced.

  4 and 5 are block diagrams showing other embodiments of the present invention. 4 and 5, the same parts as those in FIG. 1 are denoted by the same reference numerals. 4 and 5 show only a part of FIG. 1, and the CCD 101, DRAM 102, camera signal processing unit 104, I / F circuit 105, etc. are omitted.

  In the FE / BE signal processing unit of an optical disc, the BE circuit scale is generally much larger than that of FE. In the FE, the modulation / demodulation circuit and error correction circuit (ECC signal processing unit) of the reproduction / recording signal are larger in circuit scale than other circuit blocks.

  For this reason, as shown in FIG. 4, it is good also considering only the block with a comparatively large circuit scale of BE part and FE part as a reconfigurable. This is shown as Reconfigurable FE-1 / BE401. Reference numeral 402 denotes FE-2, which indicates another relatively small circuit block of the FE portion.

  In the reconfigurable FE-1 / BE 401, a number of logic circuits constituting a modulation / demodulation circuit or an error correction circuit are provided in the same manner as in the description of FIG. Then, by switching the connection of a large number of logic circuits in accordance with the type of the optical disk, a DVD modulation / demodulation circuit or error correction circuit or a BD modulation / demodulation circuit or error correction circuit is configured. This is similar to the description of FIG.

  Further, as shown in FIG. 5, it is effective in optimizing the entire circuit scale that only the BE circuit unit is a reconfigurable BE 501 and the FE unit is an IC chip 502 that cannot reconfigure the logical circuit. is there. In this case as well, the modulation / demodulation circuit and error correction circuit for DVD or the modulation / demodulation circuit and error correction circuit for BD are configured by switching the connection of a plurality of logic circuits as in FIG.

  In FIG. 5, logic circuits corresponding to each of a plurality of recording media must be provided in parallel in the FE. That is, it is necessary to have logic circuits corresponding to the DVD and BD in parallel inside the IC chip 502 as shown as FE for DVD and FE for BD.

It is a block diagram which shows one Embodiment of the video camera which concerns on this invention. It is a perspective view which shows the external appearance of the video camera which concerns on this invention. It is a block diagram which shows other embodiment of this invention. It is a block diagram which shows embodiment which makes a part of BE and FE of this invention a reconfigurable circuit. It is a block diagram which shows embodiment which makes BE of this invention a reconfigurable circuit.

Explanation of symbols

101 CCD (imaging device)
102 DRAM (memory for camera signal processing)
103 DRAM (FE / BE signal processing memory)
104 Camera Signal Processing Unit 105 I / F Circuit 106 Reconfigurable Circuit 107 MPU
108 Control circuit (CTRL)
109 Selector circuit (SEL)
110 Nonvolatile memory 111 Detection circuit 112 AFE (Analog front-end circuit)
113 Optical pickup (OPU)
114 Optical disc 115 Video camera 201 Optical disc storage portion 302 Opening / closing control portion 401 Reconfigurable FE-1 / BE
402 FE-2
501 Recon Figureable BE
502 IC chip

Claims (5)

A plurality of modulation / demodulation processes or error correction processes for recording or reproducing information on an information recording medium, and the modulation / demodulation system or error correction system can be changed according to the type of the recording medium A reconfigurable circuit having a logic circuit of
Means for determining the type of the recording medium;
A storage unit having a program indicating a configuration of a logic circuit that performs modulation / demodulation processing in the reconfigurable circuit corresponding to a type of the recording medium or a program indicating a configuration of a logic circuit that performs error correction processing;
Selecting a program corresponding to the type of recording medium of the storage means based on the determination result of the determining means, changing the configuration of a plurality of logic circuits in the reconfigurable circuit according to the selected program, and the recording medium And a means for constructing a modulation / demodulation circuit or an error correction circuit corresponding to the type of information recording / reproducing apparatus. 2. The information recording / reproducing apparatus according to claim 1, wherein the discriminating unit discriminates a type of the recording medium based on a difference in reflectance of the previous recording medium. 2. The information recording / reproducing apparatus according to claim 1, wherein the discriminating unit discriminates a type of the recording medium based on a difference in structure of a physical address on the recording medium. The information recording / reproducing apparatus according to claim 1, wherein the storage unit is rewritable from an external apparatus. Opening / closing control means for controlling so that the medium storage section for storing the recording medium can be opened / closed only during a period when the power of the apparatus is on, and information indicating the type of the recording medium when the power is turned off Means for determining the type of the recording medium based on the information of the type storing means without determining the type of the recording medium by the determining means when the power is turned on again. The information recording / reproducing apparatus of any one of Claims 1-4.

Images