JP2004006046A - Information recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform successful termination processing in the case of recording information in a rewritable recording medium or a DRAW (direct-read-after-write) type recording medium. <P>SOLUTION: The problem is solved by switching termination processing depending on a fact that a kind of a medium in which information is recorded is the rewritable recording medium or the DRAW type recording medium and further switching a performing method of the termination processing based on the supply state of electric power to be supplied. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a technique for recording information on a rewritable recording medium or a write-once recording medium.

(4) As a recording medium for recording information and the like photographed by a video camera, a recording medium using a magnetic tape has been generally used. On the other hand, with the development of the recording / reproducing technology for the disk-shaped recording medium and the high-density technology, the disk-shaped recording medium has come into practical use as a recording medium. As an example, a video camera or an information recording device using a hard disk or an optical disk (such as a DVD disk) as a recording medium has appeared. A video camera, an information recording device, or an information reproducing device using this disc-shaped recording medium can perform random access and various editing operations easily compared to a conventional recording device using a magnetic tape as a recording medium. There is an advantage that the size can be reduced.

However, this DVD-RAM is not compatible with the DVD-video format. In other words, it is impossible to reproduce with the existing DVD reproducing device. Further, the medium of the DVD-RAM itself is still expensive, and the diffusion rate of a RAM-dedicated playback device and a RAM-compatible DVD playback device is not large at present. It is easily presumed that the reproduction by the DVD reproducing device is indispensable from the viewpoint of the spread rate. Then, it becomes necessary to reproduce the medium recorded by the DVD-RAM camera with the existing DVD reproducing apparatus. There are DVD-RW and DVD-R options as recording formats, but DVD-R is more important in terms of board cost and reproducibility on existing DVD players. As described above, in consideration of marketability, it is essential that the DVD-RAM camera has a DVD-R recording function.

By the way, there are two types of recording media for optical discs: rewritable media and write-once media. The rewritable type is, as the name implies, rewritable. On the other hand, the write-once type can be written only once. DVD-RAM, DVD-RW, PC-RW, and the like are known as rewritable types, and DVD-R is a write-once type. In any case, information can be recorded as an information recording medium. However, information recording methods are different from each other because of their respective characteristics. Therefore, the information recording apparatus needs to record based on the recording method.

DVD-R can record in the same UDF bridge format as a read-only disc. Therefore, the DVD-R has almost the same characteristics as a read-only disc with respect to reproduction after recording, and can be reproduced by an existing DVD reproduction device.

However, in order to reproduce the data recorded on the DVD-R with an existing DVD reproducing device, an end process including finalizing must be performed. The details of finalization will be described later. This finalizing process is not necessary for DVD-RAM. For this reason, in a video camera and an information recording device that record information on a DVD-R and a DVD-RAM, the end process after recording must be switched depending on the medium. The DVD-RAM termination process is a process of writing information conforming to the video recording standard to a disc in order to realize special reproduction of a shot video and the like. On the other hand, the DVD-R ending process is a process of writing information and a finalizing process in accordance with the video format of the read-only disc specified in the DVD-video book. The logical format of DVD is disclosed in Japanese Patent Application Laid-Open No. 8-273304.

Next, finalization recording will be briefly described with reference to FIG.
FIG. 2 is a diagram illustrating the finalization recording. 200 VTS_1, VTS_1. . . LI is a set of data such as video, audio, sub-audio and management information thereof, LI of 201 is a lead-in area in which data capacity is recorded, and 202 is an area indicating the end position of the recorded data. . As shown in FIG. 2, when recorded on a DVD-R, it is recorded in a unit called VTS (video title set: maximum 99). The VTS 200 is generated from three pieces of data: packed data of compressed video, audio, or sub-video, information for reproducing them, and backup of the information for reproducing. The upper part of FIG. 2 shows a recording state before finalization. In the state before finalization, the data cannot be reproduced by the existing DVD reproducing apparatus, so that the data is recorded in the lead-in area 201 and the lead-out area 202 as shown in the lower part of FIG. Although not shown in FIG. 2, between the lead-in area and the VTS 200, video manager information (information for searching for a title, etc.) and information on the volume and the file structure area are simultaneously recorded. Information for using a title set may be provided between the VTS 200 and the lead-out area 202 in some cases. The detailed structure of the data is also disclosed in JP-A-8-273304. By recording in the format as described above, the data can be reproduced by the existing DVD reproducing device.

In addition, when using a video camera, batteries (rechargeable batteries called battery packs or dry batteries) are usually used, but batteries (rechargeable batteries, dry batteries, solar batteries, etc.) are supplied in the first place. The amount of power that can be supplied is limited, or the amount of power that can be supplied may change depending on environmental conditions such as temperature and sunshine conditions. For example, the amount of power that can be supplied may be smaller than the amount of power required for the finalizing process due to a decrease in temperature.

(4) If the amount of power required for the finalizing process cannot be supplied as described above due to the battery running out during the finalizing process, the finalizing process will not be performed normally.

At this time, the finalizing process may be forcibly terminated even though the process is in progress, and information recorded on the disc may not be reproduced or the disc may be destroyed. Particularly, in the case of a DVD-R, writing can be performed only once, so that the finalization process cannot be performed normally, which is very problematic for an information recording apparatus that handles a DVD-R.

Therefore, an object of the present invention is to provide an information recording apparatus that enables good information to be written on a rewritable or write-once recording medium, and does not cause a failure in the end processing of the recording medium. The purpose is to do so.

Japanese Patent Application Laid-Open No. 5-54518 is a reference example of an optical disk recording apparatus which has a problem caused by a decrease in power supply voltage.

According to the above-mentioned publication, “With such a configuration, even if the voltage of the battery (battery) 31 decreases during recording (recording), the TOC information of the recorded contents up to that time is stored and held in the RAM 9, When the main power is restored, the TOC information is recorded on the optical disk 2. Therefore, it is possible to later reproduce the recorded contents immediately before the main power is turned off. In this case, the TOC information is not recorded on the disc, and the audio data without the TOC information cannot be reproduced because the head cannot be accessed for reproduction and cannot be reproduced. However, according to the embodiment of the present invention, the TOC information until immediately before the recording is interrupted by the power down is stored. , Thereby enabling it to record contents all playback. (Paragraph number: 0021) "made is described techniques.

The purpose of the above publication is to “restore the TOC information immediately before the recording is interrupted due to the power down, so that all the recorded contents up to that point can be reproduced”. Is interrupted, the TOC information is not recorded on the disc, and the audio data without the TOC information cannot be reproduced because the head access for reproduction cannot be performed and cannot be reproduced. "

That is, when the power is turned off, the TOC information of the currently recorded contents is lost if the power is turned off unless a means is provided for holding the TOC information. The TOC information is stored and held in the RAM 9. The above publication is characterized in that it does not disappear.

On the other hand, what is problematic in the present invention is that the finalization process is forcibly terminated in the middle of the process as described above, and the information recorded on the disc cannot be reproduced or the disc is destroyed. This is not described in the above publication.

No description is made regarding the fact that finalization processing cannot be performed normally in the case of a DVD-R that can be written only once.

In order to achieve the above object, the present invention discriminates the type of recording medium to be recorded and switches the end processing for each recording medium so as to execute the end processing corresponding to each type of the recording medium. And Alternatively, the end processing is switched so as to correspond to the recording method on the recording medium.

(5) The terminating process in a rewritable type, for example, a DVD-RAM as a recording medium, is a process of writing information conforming to a video recording standard to a disc in order to realize special reproduction of a shot video and the like.

On the other hand, in a write-once type termination process in, for example, a DVD-R, writing and finalizing information in accordance with the video format of a read-only disc specified in a DVD-video book are performed.

Further, when the information recording device performs the above-described termination processing, it is determined whether or not the amount of power required to perform the termination processing can be supplied. Then, an end process is performed.

The determination as to whether or not the amount of power required to perform the termination processing can be supplied is made by determining whether the power supply is supplied by a battery or a commercial AC power supply. , Can be determined.

That is, if the power is supplied from the commercial AC power supply, the termination processing is performed on the assumption that the amount of power required to perform the termination processing can be supplied. Therefore, when supplied by a battery, the termination process cannot be performed.

However, even when the power is supplied by a battery, the amount of power that can be supplied by the battery that supplies the power can be determined, and the amount of power required to perform the termination process can be supplied (for example, If the amount of power that can be supplied is larger than the amount of power used for the termination processing, the termination processing can be performed.

In the present invention, when performing a termination process after recording information on a write-once recording medium, for example, a DVD-R, particularly in a case where a finalization process is performed, whether or not an amount of power required for the finalization process can be supplied. Is determined, and the finalizing process is performed when a necessary amount of power can be supplied. Also in this case, the above-described means is used to determine whether or not the amount of power required for the finalizing process can be supplied.

When the power supply is a commercial AC power supply as described above, the termination processing is performed.However, this is limited to the amount of power that can be supplied, such as a battery (a rechargeable battery, a dry battery, or the like). On the other hand, a commercial AC power supply is illustrated as an example of an electric power that can be supplied without limitation. Therefore, if there is no limit to the amount of power that can be supplied, it can be used as a power supply source for performing the termination process. For example, electric power obtained from an automobile may be used as a power supply source. In addition, although the battery is also a rechargeable battery or a dry battery, it is an example of a battery having a limited amount of power that can be supplied. For example, a configuration in which a solar battery or the like is used for power supply as the above battery can be sufficiently realized. Can be performed, but the termination process may not be performed depending on the amount of power that can be supplied.

Batteries (rechargeable batteries, dry batteries, solar cells, etc.) are limited in the amount of power that can be supplied.However, there is a characteristic that the amount of power that can be supplied may vary depending on environmental conditions such as temperature and sunshine conditions. It has.

On the other hand, a commercial AC power supply has an infinite amount of power that can be supplied, and generally can supply power stably, and the supplied power varies depending on environmental conditions such as a battery. It is unlikely to occur.

Therefore, even when the fluctuation of the power supplied on average is taken into consideration, when power is supplied from the commercial AC power supply, the data recorded in the information recording device is protected as a termination process, It is intended to improve the reliability of the information recording device.

However, even when the battery is supplied with power, the stability of the supplied power is detected, and if the power required for the termination process can be supplied stably, the termination process is executed. It may be.

It should be noted that the detection or determination that the power required for the termination process can be supplied stably is performed even when the change in the supplied power with respect to time is stable, even if the power can be supplied stably. good. For example, by referring to the power supplied from the battery with respect to time, continuously or discretely, the change state and characteristics of the supply power are obtained, and based on the change state and characteristics, the termination processing is required. It is possible to detect or determine that power can be supplied stably.

In addition, in detecting or determining the stability of power supply based on the state of the change and the characteristics, the characteristics of the battery (including the discharge characteristics and the like) are referred to, or the temperature change is measured and referenced by a temperature sensor. For example, sensors and means for measuring environmental conditions, such as measuring and referring to sunshine conditions with a sensor for light, may be provided and executed.

In order to achieve the above object, the present invention provides a video compression unit for compressing a video signal, an audio compression unit for compressing an audio signal, video data output by the video compression unit, and output by the audio compression unit. Multiplexing means for multiplexing audio data in a predetermined format; determining means for determining the type of recording medium; reading and writing means for performing writing or reading according to the medium; power supply means for driving the apparatus; Control means for controlling the information recording device, and for monitoring or determining the connection state of the power supply, and a termination process based on the control of the recording medium based on the control of the control means. An information recording apparatus (a camera-integrated type) including a ending means for performing the operation and a notifying means for notifying a warning message is configured. Note that the control means for monitoring or determining the connection state of the power supply does not necessarily need to be implemented by the control means, and may be provided with means for separately implementing the control means.

In order to achieve the above object, according to the present invention, in an information recording apparatus for recording information on a recording medium, a driver means for reading and writing information from and to the recording medium, and a recording medium for determining a type of the recording medium Determining means, end processing means for performing end processing of the recording medium via the driver means, and control means for controlling the information recording device, wherein the end processing means is based on a type of the recording medium. , End processing is switched.

In order to achieve the above object, according to the present invention, a recording medium for recording information is a rewritable recording medium or a write-once recording medium.

In order to achieve the above object, according to the present invention, a power supply unit that supplies power to the information recording device, and a power supply determination unit that determines a supply state of the power supply unit, the power supply determination unit includes It is determined whether the power supply is supplied by a battery or a commercial AC power supply, and when the power supply is supplied by the commercial AC power supply, the termination processing means performs termination processing.

In order to achieve the above object, according to the present invention, a power supply unit that supplies power to the information recording device, and a power supply determination unit that determines a supply state of the power supply unit, the power supply determination unit includes It is determined whether the power supply is supplied by a battery or a commercial AC power supply, and when the power supply is supplied by the battery, the termination processing means does not perform the termination processing.

In order to achieve the above object, according to the present invention, a power supply unit that supplies power to the information recording device, and a power supply determination unit that determines a supply state of the power supply unit, the power supply determination unit includes Then, the amount of power that can be supplied by the battery that supplies power is determined, and when the amount of power that can be supplied by the battery is larger than the amount of power used for the termination processing, the termination processing unit performs the termination processing.

According to the present invention, in order to achieve the above object, a notifying unit is provided, and the notifying unit notifies the power supply from the commercial AC power supply.

According to another aspect of the present invention, there is provided an information recording apparatus for recording information on a rewritable recording medium or a write-once recording medium, comprising: driver means for reading and writing information from and to a recording medium; The type of the medium is a rewritable recording medium or a recording medium discriminating means for discriminating whether it is a write-once recording medium, and via the driver means, the rewritable recording medium or the write-once recording medium. Comprising: termination processing means for performing termination processing on a recording medium; and control means for controlling the information recording device, wherein the recording medium is a rewritable recording medium and a write-once recording medium based on the discrimination of the recording medium discrimination means. Then, the termination processing means switches the termination processing.

Further, in order to achieve the above object, according to the present invention, in an information recording apparatus for recording information on a write-once recording medium, a driver for reading and writing information on the write-once recording medium; Termination processing means for performing termination processing based on a recording method on the write-once recording medium; power supply means for supplying power to the information recording device; power supply determination means for determining a supply state of the power supply means; Control means for controlling the information recording device, wherein the power supply determining means determines whether the power supply is supplied by a battery or a commercial AC power supply, and the power supply is supplied by the commercial AC power supply. In this case, the termination processing means performs termination processing.

Further, in order to achieve the above object, according to the present invention, in an information recording apparatus for recording information on a write-once recording medium, a driver for reading and writing information on the write-once recording medium; Termination processing means for performing termination processing based on a recording method on the write-once recording medium; power supply means for supplying power to the information recording device; power supply determination means for determining a supply state of the power supply means; Control means for controlling the information recording device, wherein the power supply determining means determines whether the power supply is supplied by a battery or a commercial AC power supply, and the power supply is supplied by the battery. Then, the termination processing means does not perform termination processing.

Further, in order to achieve the above object, according to the present invention, in an information recording apparatus for recording information on a write-once recording medium, a driver for reading and writing information on the write-once recording medium; Termination processing means for performing termination processing based on a recording method on the write-once recording medium; power supply means for supplying power to the information recording device; power supply determination means for determining a supply state of the power supply means; Control means for controlling the information recording device, wherein the power supply determining means determines the amount of power that can be supplied by the battery to be supplied with power, and when the amount of power that can be supplied by the battery is larger than the amount of power used for the termination process. The termination processing means performs termination processing.

In order to achieve the above object, according to the present invention, in a rewritable recording medium or an information recording device that records on a write-once recording medium, a power supply monitoring unit that monitors a unit that supplies power to the information recording device is provided. When the power supply monitoring unit determines that the power is supplied by the AC power supply, the termination processing unit performs termination processing on the write-once recording medium.

In order to achieve the above object, according to the present invention, in a rewritable recording medium, or an information recording apparatus that records on a write-once recording medium, a notification unit is provided, and the power supply monitoring unit is supplied with power by a battery. When it is determined that the recording medium is present, the end processing unit does not perform the end processing on the write-once type recording medium, and notifies the power supply with the AC power by the notification unit.

According to the present invention, it has become possible to provide an information recording apparatus capable of switching the end processing according to the type of recording medium (rewritable type, write-once type recording medium).

Further, when the information recording device performs the end process, it is determined whether the amount of power required to perform the end process can be supplied, when the necessary amount of power can be supplied, Since the termination processing is performed, the termination processing can be performed normally.

Therefore, it is possible to prevent the information recorded on the disk from being unreproducible or from being destroyed even if the end processing is being performed, and the information recorded on the information recording device is recorded in the information recording apparatus. The data can be protected and the reliability of the information recording device can be improved. According to the present invention, the end processing can be normally performed. Therefore, the present invention is very useful for a write-once recording medium such as a DVD-R which can be written only once.

The present invention is applicable not only to the write-once type recording medium, but also to a recording medium that requires an end process after recording, and is also useful for a rewritable recording medium such as a DVD-RAM. It is something.

Also, although the embodiments according to the present invention have been described, according to the present invention, it is possible to provide, for example, an information recording apparatus such as a camera integrated type in which a DVD-RAM and a DVD-R are integrally mounted.

Hereinafter, embodiments of the present invention will be described.

(1) The first embodiment will be described with reference to FIG. The system of the embodiment is a system capable of recording both DVD-RAM and DVD-R optical disks.

FIG. 1 is a system diagram of an embodiment of the present invention. In the figure, reference numeral 100 denotes a control unit for controlling the start and end timings of recording, confirmation of discrimination of a recording medium and monitoring of a power supply state, 101 a video input terminal for digital video signals, and 102 a A video compressor 103 for compressing a video signal output from the video input terminal 101; an audio input terminal 103 for digital audio signals; and an audio 104 for compressing an audio signal output from the audio input terminal 103 A compression unit 105 multiplexes the data output from the video compression unit 102 and the audio compression unit 104 into a system stream compliant with standards such as MPEG, and 106 stores a system stream generated by the multiplexing unit 105 on a recording medium. And a driver unit 107 that performs writing and reading according to the medium after determining that the recording medium is read and written by the driver unit 106. Reference numeral 108 denotes a DVD-RAM and a DVD-R, reference numeral 108 denotes an end processing unit for switching the end processing when the recording medium 107 is a DVD-RAM or DVD-R, and reference numeral 109 denotes a battery (not shown) for driving a video camera. The power supply unit is connected to a rechargeable battery, a dry cell, or the like) or a commercial AC power supply (hereinafter, referred to as an AC power supply).

The control unit 100 checks the recording medium and monitors the state of the power supply. However, a device for confirming the determination of the recording medium (in another expression, a recording medium determining device for determining the type of the recording medium) and a device for monitoring the state of the power supply (in another expression, the power supply monitoring device or the power supply device) The power supply determining means for determining the supply state) may be provided separately from the control unit 100.

First, the recording method will be described. When the user desires recording, the control unit causes the driver unit 106 to confirm whether the recording medium 107 is a DVD-RAM or a DVD-R. The discrimination result of the disc is stored in a flag. The flag is 2-bit judge_disc_flg. For example, if the flag value is 00b, the medium is DVD-RAM, if 01b is DVD-R, and if 10b and 11b, the medium is other than the above. The flag is not limited to 2 bits as long as it is sufficient to be able to identify the disk. Thereafter, initialization of each block is performed as necessary, and preparation for recording is started. The disc may be determined when the disc is inserted into the system. After initialization, an A / D converter (not shown) is operated to take in video data and audio data, and digital video data is input from the video input terminal 101, and audio digital data is input into the audio input terminal. 103. It is assumed that the input digital video signal has been subjected to luminance and color signal processing as necessary, and is compressed by the video compression unit 102 in accordance with the MPEG standard. If necessary, a buffer for storing data before and after the video compression unit may be provided. The digital audio signal input from the audio input terminal 103 is subjected to audio compression according to the MPEG standard or Dolby Digital (AC3) standard in the audio compression unit 104 via a buffer or the like as necessary. In the case of linear PCM recording, no compression is performed. The multiplexing unit 105 generates a system stream conforming to the MPEG standard from the video compression data and the audio compression data generated by the video compression unit 102 and the audio compression unit 104, and packetizes the data into a specified DVD format. Do. For DVD-RAM, packetization is performed according to the video recording standard, and for DVD-R, packetization is performed according to the video format of a read-only disc. In this case, a buffer is often provided before and after the multiplexing unit. The system stream generated by the multiplexing unit 105 is recorded on the recording medium 107 via a buffer or the like not shown in FIG. Thereafter, when the user issues an end instruction (for example, pressing a button of the system (recording and recording stop may be the same button)), the control unit issues an end instruction to each block. An A / D converter not shown in FIG. 1 is also stopped. At this time, finalization is not performed when recording is performed in the DVD-RAM format. If recording is performed on a DVD-R, finalizing recording enables reproduction on an existing DVD reproducing apparatus. However, once finalizing is performed, additional writing to the disc cannot be performed. Therefore, it is general that finalization is not always performed. Of course, finalization may be automatically performed at the end of DVD-R recording.

Next, the termination process when the user requests the finalize will be described with reference to FIGS. 1, 3, and 8. FIG. FIG. 3 is a flowchart of the finalizing process, and FIG. 8 is a diagram for explaining a flow of switching of the end process accompanying the discrimination.

(4) After DVD-R recording, a finalizing process must be performed in order to reproduce the data on an existing DVD reproducing device. However, when the battery runs out during the finalizing process (when the amount of power supplied from the battery becomes smaller than the amount of power required for the finalizing process), the finalizing process is not normally performed.

In this case, even if the finalization process is in progress, it may be forcibly terminated, and there is a possibility that reproduction cannot be performed again unless the last written position is remembered. In the worst case, the disk may be destroyed.

(4) When the user selects the finalizing process in order to avoid the above problem, the control unit 100 checks the connection state of the power supply unit 109 and the connected one. The control unit 100 stores the current power supply connection state in a 1-bit flag. This flag is set to connect_flg. If the value is 0b, the battery is connected, and if the value is 1b, the AC power is connected. This flag does not need to be limited to one bit as long as the connection state of the battery or the AC power supply is known.

Here, the processing in the end processing unit 108 will be described with reference to FIG.
The termination processing unit 108 receives a flag “connect_flg” indicating that the recording medium 107 is a DVD-RAM or a DVD-R at the same time as receiving a termination processing command from the control unit. The process is started in START (800), and in order to perform Disc discrimination, the above-described flag is discriminated to determine what the recording medium is (801). If it is a DVD-R (801-DVD-R), a DVD-R end process 802 is performed. In the case of a DVD-RAM (801-DVD-RAM), an end process 803 for performing an end process corresponding to the DVD-RAM is performed.

End processing 803 is for writing IFO information conforming to the DVD-RAM video recording standard. The IFO information is information for performing special reproduction or the like.

On the other hand, in the DVD-R termination processing 802, IFO information conforming to the reproduction-only video format is written, and finalization is performed as necessary. FIG. 3 shows a processing flow regarding finalization performed in the DVD-R termination processing 802 at this time.

In the following description, it is assumed that the processing is started from START 300 after writing the IFO information.

First, the power supply connected in the power supply connection check 301 is checked. As a result, when the connect_flg flag indicating the connection state of the power supply is 0b, the battery is connected, and when the connect_flg flag is 1b, the connection is the AC power supply. Based on the power supply connection check 301, if the AC power supply is connected (302-YES), the finalizing process 303 is executed, and if the battery is connected (302-NO), the process ends without performing the finalizing process (304).

A battery such as a rechargeable battery is connected to a portable information recording device such as a video camera. In the first place, a battery (a rechargeable battery, a dry battery, a solar cell, or the like) or the like has a limited amount of power that can be supplied, or the amount of power that can be supplied changes depending on environmental conditions such as temperature and sunshine conditions. The video camera has a display of the battery capacity, but since it is displayed in several steps, there is a case where the accurate battery life (the remaining amount of power that can be supplied) is not known. For that reason, there are many cases where the battery runs out halfway, even if you think you can still use it. That is, when a battery is connected and power is supplied from the battery, the battery cannot always supply necessary power until the finalization process is completed. Therefore, performing the finalizing process in a state where power is supplied from the battery has a possibility that the finalizing process cannot be performed normally due to a shortage of the amount of power that can be supplied by the battery. Therefore, it is considered better not to execute the finalizing process in a state where power is supplied from the battery.

On the other hand, the AC power supply has a limited amount of power that can be supplied, and the power that can be supplied hardly fluctuates even when environmental conditions such as temperature and sunshine conditions change. Therefore, if the power is supplied from the AC power supply, the amount of power required to perform the finalizing process can be supplied, so that the finalizing can be completed normally even if the finalizing process is executed. Therefore, if the power is supplied from the AC power supply, the finalizing process may be executed.

In the above embodiment, when the information recording device such as a video camera performs the finalizing process, it is determined whether or not the amount of power required for performing the finalizing process can be supplied. Finalization processing is performed when can be supplied.

The determination as to whether the amount of power required to perform the finalization process can be supplied is performed by determining whether the power supply is supplied from a battery or from an AC power supply. Things.

That is, if the power supply is provided by the AC power supply, the finalizing process is performed on the assumption that the amount of power required to perform the finalizing process can be supplied. Therefore, when supplied by a battery, the finalizing process cannot be performed.

If the finalization process is performed while the battery is used as a power source and power is supplied from the battery, the power may not be supplied halfway and the finalization process may not be completed normally. In order to give priority to the reliability as described above and to protect the data recorded on the recording medium, it is inevitable that the finalization process is not executed when the battery is used as a power supply.

On the other hand, in a state where the AC power supply is connected to an information recording apparatus such as a video camera and the power is supplied from the AC power supply, normally, the power required for the finalization processing is constantly supplied from the AC power supply. Can be completed normally, the data recorded in the information recording device is protected, and the reliability of the information recording device can be improved.

As described above, in the above-described embodiment, when the user wants to perform finalization, the power supply connection state is monitored, and the finalization is not permitted except for the AC power supply. Can be avoided.

Although the above embodiment has been described with respect to an example of the end processing for a DVD-R, the present embodiment can be applied to a recording medium that requires the end processing after recording. May also be implemented.

Next, as a second embodiment, an embodiment in which the finalizing process is executed even when the power supply is other than the AC power will be described with reference to FIGS. FIG. 4 also shows a flow of the finalizing process, and a description of the same processes as those in FIG. 3 will be omitted. The system configuration is the same as in the first embodiment. In the first embodiment, the power supply is monitored, the power supply is determined, and when the AC power supply is connected, the finalization process is executed. It is something that can be avoided.

However, in the case of a portable information recording device such as a video camera, in many cases, an image is generally taken outdoors, and in this case, the AC power supply is not used while being used. In this case, in the first embodiment, since the AC power is not connected, the finalizing process cannot be performed, which may be inconvenient. For example, some users may wish to finalize even outdoors since they have already recorded the entire disc.

Here, the second embodiment is to solve this inconvenience, and is an embodiment in which the finalizing process can be executed even when a battery is connected. In the second embodiment, the connected power is checked in the power connection check 301, and if the AC power is connected (302-YES), the same processing as that of the first embodiment is executed thereafter.

On the other hand, as a result of the power connection check (301), if the battery is connected (302-NO), the amount of power that can be supplied by the battery connected to the power supply unit 109 is checked (401), and the finalization process is performed. If the required amount of power can be supplied (for example, the amount of power that the battery can supply is larger than the amount of power required to perform the termination process) (402-YES), the finalizing process 303 is executed, and If it is not possible to supply the amount of power required to perform the finalizing process (402-NO), the process ends without performing the finalizing process (304).

In the above embodiment, even when a battery is connected, the finalizing process is executed when the amount of power supplied from the battery is larger than the amount of power required to execute the finalizing process. is there.

Here, other points to be considered when using a battery will be described, and a new technology will be described.

This is because batteries (rechargeable batteries, dry batteries, solar batteries, etc.) are limited in the amount of power that can be supplied as described above, but the amount of power that can be supplied depends on changes in environmental conditions such as temperature and sunlight conditions. It has characteristics that may change.

Therefore, when the finalizing process is started, the amount of power stored in the battery is large, and even if the amount of power supplied from the battery is larger than the amount of power required to execute the finalizing process, the environmental Due to a change in conditions or the like, at some point, the supplied power may be lower than the power required to execute the finalizing process, and the process may not be executed normally.

In this case, it is detected whether or not the amount of power remaining without being discharged to the battery, that is, the amount of power that can be supplied from the battery is larger than the amount of power required to execute the finalizing process. Judgment is not enough. That is, it is necessary to additionally perform a process of detecting and determining whether or not the necessary power can be stably supplied during the execution of the finalizing process. In other words, in addition to checking whether the total amount of power required for the finalization process can be supplied, it is also necessary to stably supply the power required to continue the finalization process every moment until the process is completed. It is also necessary to determine whether or not the battery can be connected.

In this case as well, the stability of the power supplied from the battery is detected, and if the power required for the finalizing process can be supplied stably, the finalizing process may be executed. Conversely, even if the amount of power that can be supplied by the battery can supply the entire amount of power required for finalization processing, the power required to continue processing the finalization processing every moment is stable until the processing is completed. If the supply cannot be continued, the finalizing process is not executed.

FIG. 11 illustrates this processing. FIG. 11 is obtained by adding a power supply stability check 410 for detecting the stability of the supplied power to the process of FIG. 4. Therefore, the added process will be described.

That is, in FIG. 11, the stability of the power that can be supplied is checked (410), and if the amount of power required to perform the finalizing process can be supplied stably (412-YES), the finalizing process is performed. If the power is not supplied stably (412-NO), the process is terminated without performing the finalizing process (304).

It should be noted that the detection or determination that the power required for the finalizing process can be supplied stably is performed even if the change in the supplied power with respect to time is stable even if the power can be supplied stably. good. For example, by referring to the power supplied from the battery with respect to time, continuously or discretely, a change state and characteristics of the supply power are obtained, and based on the change state and characteristics, necessary for finalization processing. It is possible to detect or determine that power can be supplied stably.

Further, in detecting or determining the stability of the power supply based on the state of the change and the characteristics, the characteristics of the battery (including the discharge characteristics and the like) are referred to (in this case, the type of the connected battery). May need to be detected or determined, or set by the user in the initial setting.), A temperature sensor is used to measure and refer to a temperature change, and a light sensor is used to measure and refer to sunshine conditions. Sensors and means for measuring environmental conditions may be provided and executed.

Although it is related to the items described in the first embodiment, the AC power supply is not limited in the amount of electric power that can be supplied, and usually can supply electric power stably, As described above, the supplied power hardly changes depending on environmental conditions.

Therefore, when the power is supplied from the AC power supply, the finalizing process is performed in the information recording device even when the fluctuation of the supplied power on average and the stability of the power supply are considered. Data can be protected, and the reliability of the information recording device can be improved.

Next, as a third embodiment, an embodiment for notifying the processing contents when the end processing in the first embodiment is being executed will be described with reference to FIGS. 1, 5, and 7. FIG.

The system configuration is the same as in the first embodiment. FIG. 5 is a flowchart in which confirmation screen displays 500 and 501 are added to FIG. FIG. 7 shows an operation GUI of this system. 701 is a thumbnail image. A thumbnail image is a reduced image of a recorded image. The first picture is displayed so that you can easily see what is being recorded. A portion 702 displays the type of the recording medium. 703 is a display showing the current state. The whole program is all the recorded images in this case.

(4) When the user attempts to finalize, a pull-down menu 710 is displayed on the screen 700. The finalizing item is selected from the pull-down menu 710. Then, the processing item is displayed in the display area of 720, and it is known that the process has shifted to the finalizing process, and at the same time, a finalizing confirmation screen is displayed. This is 721. The message "Do you want to finalize" on the confirmation screen 721 prompts the user to confirm, for example, "Do you want to finalize after returning home?" If so, it is not limited to the above message. The user can see the confirmation screen 721 only when finalization is performed.

Displaying the confirmation screen 721 is the confirmation screen display 501 in FIG. If finalization is to be stopped here, No may be selected, and when finalization is performed, Yes may be selected. When finalization is not performed because the AC power supply is not connected, the confirmation screen 721 does not need to display “Do you want to perform finalization?”, And a message notifying the user of the fact is given. May be. If so, the confirmation screen display 500 shown in FIG. 5 is used. For example, any message that prompts the user to connect the AC power, such as “finalization cannot be performed because the AC power is not connected” or “Please connect the AC power” may be used.

(4) As described above, the operability is improved by informing the user of the content of the finalizing process.

Next, also in the fourth embodiment, an embodiment for notifying the processing contents when the end processing in the second embodiment is being executed will be described with reference to FIGS. 1, 6, and 7. FIG.

The system configuration is the same as in the first embodiment. FIG. 6 is a flowchart in which confirmation screen displays 600 and 601 are added to FIG. FIG. 7 shows an operation GUI of this system. 701 is a thumbnail image. The thumbnail image is the first image of the input image. A portion 702 displays the type of the recording medium. 703 is a display showing the current state. When the user attempts to finalize, a pull-down menu 710 is displayed on the screen 700. The finalizing item is selected from the pull-down menu 710. Then, it is found that the process has been shifted to the finalizing process as indicated by 720, and at the same time, a finalizing confirmation screen is displayed. This is 721. The expression “Do you want to finalize” on the confirmation screen 721 is, for example, “Do you want to finalize after returning home?” Or “Do you really want to do it?” anything is fine. The user can see the confirmation screen 721 only when finalization is performed. Displaying the confirmation screen 721 is the confirmation screen display 601 in FIG. If finalization is to be stopped here, No may be selected, and when finalization is performed, Yes may be selected. Further, when the finalization is not performed because the power amount of the battery is smaller than the power amount necessary for performing the finalizing process, a display to inform the user may be made. If so, the confirmation screen display 600 shown in FIG. 6 is used. For example, "finalization cannot be performed because the power supply capacity is insufficient", "please recharge", or "finalize after replacing with new batteries", "connect the AC power supply. And so on.

(4) As described above, the operability is improved as in the third embodiment by notifying the user of the contents of the finalizing process.

Next, an embodiment of a video camera and a DVD recorder as information recording / reproducing devices incorporating the system configuration described in the first to fourth embodiments will be described.

First, as a fifth embodiment, a video camera capable of recording both DVD-RAM and DVD-R optical disks will be described with reference to FIG.

# 900 is a lens. A CCD 901 converts an optical signal obtained through the lens 900 into an electric signal. Reference numeral 902 denotes an A / D converter that converts an analog electric signal converted by the CCD 901 into a digital signal, and 903 converts the digital signal converted by the A / D converter 902 into a format that allows MPEG compression. A signal processing unit 904 that performs format conversion to NTSC or the like during reproduction, and a video compression / expansion unit 904 that compresses the video signal converted by the signal processing unit 903 into MPEG. At the time of reproduction, the compressed signal is expanded and sent to the signal processing unit 903. Reference numeral 906 denotes a microphone; 907, an AMP unit that amplifies an audio signal from the microphone 906; 908, an A / D and D / A converter that converts the audio signal amplified by the AMP unit 907 into a digital signal; 915 is an LCD panel such as a liquid crystal monitor, and 916 is a speaker.

The control unit 905, the driver unit 911, the recording medium 912, the power supply unit 913, and the termination processing unit 914 perform the same processing as in the first to fourth embodiments. The same processing as in the first to fourth embodiments is performed for 904 and 909, but decompression is also performed during reproduction. For 910, the same multiplexing processing as in the first to fourth embodiments is performed, but at the time of reproduction, the packetized compressed signal may be separated.

The video signal input from the lens 900 is input to the AD converter 902 through the CCD 901 and is converted into a digital signal here. The converted digital signal is converted into a format that allows MPEG recording by the signal processing unit 903 and is MPEG-compressed by the video compression / expansion unit. This video compression / expansion unit corresponds to the video compression unit 102 in FIG. At the time of reproduction, decompression of compressed data is also performed. The audio signal input from the microphone 906 is amplified by the AMP 907 and then converted to a digital signal by the A / D and D / A converter 908. The converted digital signal is compressed by an audio compression / decompression unit 909 such as MPEG or Dolby Digital. This audio compression / expansion unit corresponds to the audio compression unit 104 in FIG. At the time of reproduction, decompression of compressed data is also performed. The processes after the video compression / expansion unit 904 and the audio compression / expansion unit 909 are as described in the first to fourth embodiments.

Next, processing at the time of reproduction will be described with reference to FIG.
When the user gives a reproduction instruction, the driver unit 911 determines whether the recording medium is a DVD-RAM or DVD-R, reads data according to the medium, and sends the data to the multiplexing / demultiplexing unit 910 via a buffer or the like. Send. The transmitted data is packetized and separated, and the video elementary stream is sent to the video compression / expansion unit 904 and the audio elementary stream is sent to the audio compression / expansion unit 909.

(5) The expanded video signal is converted into a format such as NTSC by the signal processing unit 903 and displayed on the LCD panel 915.

After the audio is expanded by the audio compression / expansion unit 909, it is converted into an analog audio signal by the A / D and D / A converter 908, and is amplified by the AMP 907. The amplified audio signal is output through the speaker 916. The synchronization of the video and audio at this time is performed by the multiplexing / demultiplexing unit 910.

As described above, a video camera capable of recording on both DVD-RAM and DVD-R optical discs performs finalization processing by switching finalization recording depending on the state of power supply connection and the capacity of the battery during DVD-R recording. It is no longer possible to prevent normal processing, so that it is possible to prevent the optical disk from being unable to be played back and the optical disk from being destroyed. Further, by displaying the warning message, it is possible to know the contents of the process currently being executed and to know what to do next, so that the operability is also improved.

Next, a video recorder capable of recording both DVD-RAM and DVD-R optical disks will be described as a sixth embodiment with reference to FIG. The recorder referred to here is not necessarily limited to a portable portable type and a portable type, but includes a stationary deck.

1001 denotes a video input terminal such as a line input, 1002 denotes an A / D converter for converting an analog electric signal from the video input terminal 1001 into a digital signal, and 1003 denotes a digital signal converted by the A / D converter 1002. A signal processing unit 1004 converts the signal into a format that can be compressed by MPEG, and converts the format to NTSC or the like at the time of reproduction. A video compression unit 1004 compresses the video signal converted by the signal processing unit 1003 into MPEG. Extension part.

(4) At the time of reproduction, the compressed signal is expanded and sent to the signal processing unit 1003. 1006 is an audio input terminal for audio input, 1007 is an AMP unit for amplifying the audio signal from the audio input terminal 1006, and 1008 is an A for converting the audio signal amplified by the AMP unit 1007 to a digital signal. A / D and D / A converter, 1015 is an LCD panel such as a liquid crystal monitor, and 1016 is a speaker. A control unit 1005, a driver unit 1011, a recording medium 1012, a power supply unit 1013, and a termination processing unit 1014 perform the same processing as in the first to fourth embodiments. The same processing as in the first to fourth embodiments is performed for 1004 and 1009, but decompression is also performed during reproduction. The multiplexing process similar to that of the first to fourth embodiments is also performed for 1010, but the packetized compressed signal may be separated during reproduction.

The video signal input from the video input terminal 1000 is input to the AD converter 1002, where it is converted into a digital signal. The converted digital signal is converted into a format that allows MPEG recording by the signal processing unit 1003, and MPEG-compressed by the video compression / expansion unit 1004. The video compression / expansion unit 1004 corresponds to the video compression unit 102 in FIG. At the time of reproduction, decompression of compressed data is also performed. The audio signal input from the audio input terminal 1006 is amplified by the AMP 1007 and then converted into a digital signal by the A / D and D / A converter 1008. The converted digital signal is compressed by an audio compression / expansion unit 1009 such as MPEG or Dolby Digital. The audio compression / expansion unit 1009 corresponds to the audio compression unit 104 in FIG. At the time of reproduction, decompression of compressed data is also performed. The processing after the video compression / expansion unit 1004 and the audio compression / expansion unit 1009 is as described in the first to fourth embodiments.

Next, processing at the time of reproduction will be described with reference to FIG.
When the user issues a reproduction instruction, the driver unit 1011 determines whether the recording medium is a DVD-RAM or DVD-R, reads data according to the medium, and sends the data to the multiplexing / demultiplexing unit 1010 via a buffer or the like. Send. The transmitted data is packetized and separated, so that the video elementary stream is sent to the video compression / expansion unit 1004 and the audio elementary stream is sent to the audio compression / expansion unit 1009. The decompressed video signal is converted into a format such as NTSC by the signal processing unit 1003 and displayed on the LCD panel 1015.

The audio is expanded by the audio compression / expansion unit 1009, converted to an analog audio signal by the A / D and D / A converter 1008, and amplified by the AMP 1007 unit. The amplified audio signal is output through speaker 1016. The synchronization of the video and audio at this time is performed by the multiplexing / demultiplexing unit 1010.

As described above, a video recorder that can record on both DVD-RAM and DVD-R optical discs, and performs finalization processing by switching finalization recording according to the state of power supply connection and battery capacity during DVD-R recording. Can not be processed normally, forcibly terminated, etc., for example, and it is also possible to prevent the disk from being destroyed. The operability is also improved by displaying the warning message.

Although the above embodiment has been described with respect to an example of the end processing for a DVD-R, the present embodiment can be applied to a recording medium that requires the end processing after recording. May also be implemented.

Although the present invention has been described in the embodiments, the present invention is also applicable to an information recording device (a camera-integrated information recording device) for recording a signal from a video camera, a portable information recording device, and a stationary information recording device. It is possible.

The configuration described in JP-A-5-54518 of the reference example may be used in combination with the present invention.

Here, another effect of the embodiment according to the present invention will be described.

(4) If the end processing is performed after recording on the write-once recording medium, the recording medium cannot be removed during the end processing, so that the recording cannot be performed and the user has to wait.

に よ っ て Depending on the recording standard adopted, data is written to an area that is not recorded in the end processing. Therefore, as the information recording time is shorter, the area where no information is recorded becomes larger, and the amount of data written to the area at the time of the end processing becomes larger, so that it takes more time and waits. Therefore, the longer the end process takes, the longer the time spent waiting for the start of recording after replacing with a new recording medium.

However, when the above-described embodiment in which the termination process is performed when an AC power supply is connected to a portable information recording device such as a camera is applied, the portable information recording device such as a camera generally uses a battery. , The power is supplied and the AC power supply is not connected, so that the termination processing is not performed. Therefore, an effect is obtained that the user does not have to wait for data writing in the end processing.

Also, despite the large unrecorded area on the write-once recording medium (i.e., there are many areas that can be recorded), additional recording cannot be performed as a result of the termination processing due to an incorrect instruction, for example, According to the above embodiment, it can be avoided that it cannot be used effectively.

1 is a system diagram showing an embodiment according to the present invention. It is a figure explaining finalization. FIG. 11 is a diagram for describing a finalization processing flow. FIG. 11 is a diagram for describing a finalization processing flow. FIG. 11 is a diagram for describing a finalization processing flow. FIG. 11 is a diagram for describing a finalization processing flow. It is a figure explaining a display screen. FIG. 14 is a diagram illustrating a flow of switching end processing according to Disc discrimination. FIG. 2 is a diagram illustrating a video camera that can record on a DVD-RAM and a DVD-R. FIG. 2 is a diagram for describing a video recorder that can be recorded on a DVD-RAM and a DVD-R. FIG. 11 is a diagram for describing a finalization processing flow.

Explanation of reference numerals

Reference Signs List 100 control unit 101 video input terminal 102 video compression unit 103 audio input terminal 104 audio compression unit 105 multiplexing unit 106 driver unit 107 recording medium 108 termination processing unit 109 power supply unit 200 VTS (video title set)
201 Lead-in area 202 Lead-out area 300 Finalization processing 301 Power connection check unit 302 Judgment unit 303 Finalization recording unit 304 END
400 Finalization processing 401 Power amount check unit 402 Judgment unit 403 Finalization recording unit 404 END
500 Confirmation screen display 501 Confirmation screen display 600 Confirmation screen display 601 Confirmation screen display 700 Display screen 701 Thumbnail image 702 Disk discrimination display 703, 720 Processing content display bar 710 Pulldown menu 721 Finalize confirmation screen 800 Disc discrimination section 801 Disc discrimination section 802 DVD -R end processing unit 803 end processing unit 900 lens 901 CCD
902 AD converter 903 Signal processing unit 904 Video compression / expansion unit 905 Control unit 906 Microphone 907 AMP
908 A / D and D / A converter 909 Audio compression / expansion unit 910 Multiplex / separation unit 911 Driver unit 912 Recording medium 913 Power supply unit 914 Termination processing unit 915 LCD panel 916 Speaker 1001 Video input terminal 1002 A / D converter 1003 Signal processing unit 1004 Video compression / decompression unit 1005 Control unit 1006 Audio input terminal 1007 AMP
1008 A / D and D / A converter 1009 Audio compression / expansion unit 1010 Multiplexing / demultiplexing unit 1011 Driver unit 1012 Recording medium 1013 Power supply unit 1014 Termination processing unit 1015 LCD panel 1016 Speaker

Claims (12)

In an information recording device that records information on a recording medium,
Driver means for reading and writing information from and to the recording medium;
Recording medium determining means for determining the type of the recording medium,
End processing means for performing end processing of the recording medium via the driver means;
Control means for controlling the information recording device,
The information recording apparatus according to claim 1, wherein the termination processing unit switches termination processing based on a type of the recording medium. The information recording device according to claim 1,
The information recording apparatus, wherein the recording medium is a rewritable recording medium or a write-once recording medium. The information recording device according to claim 1,
Power supply means for supplying power to the information recording device;
Power supply determining means for determining a supply state of the power supply means,
With
The power supply determining means determines whether the power supply is supplied by a battery or a commercial AC power supply,
The information recording apparatus according to claim 1, wherein when power is supplied from a commercial AC power supply, the termination processing unit performs termination processing. The information recording device according to claim 1,
Power supply means for supplying power to the information recording device;
Power supply determining means for determining a supply state of the power supply means,
With
The power supply determining means determines whether the power supply is supplied by a battery or a commercial AC power supply,
The information recording apparatus according to claim 1, wherein when power is supplied from a battery, the termination processing unit does not perform termination processing. The information recording device according to claim 1,
Power supply means for supplying power to the information recording device;
Power supply determining means for determining a supply state of the power supply means,
With
The power supply determining unit determines an amount of power that can be supplied by a battery that supplies power,
The information recording apparatus according to claim 1, wherein when the amount of power that can be supplied by the battery is larger than the amount of power used for the termination processing, the termination processing unit performs the termination processing. The information recording device according to claim 4,
Equipped with notification means,
An information recording apparatus, wherein a notification is made by the notifying means to supply electric power from a commercial AC power supply. In an information recording apparatus that records information on a rewritable recording medium or a write-once recording medium,
Driver means for reading and writing information from and to a recording medium;
The type of the recording medium is a rewritable recording medium, or a recording medium determining unit that determines whether it is a write-once recording medium,
Via the driver means, the rewritable recording medium, or end processing means for performing end processing to the write-once recording medium,
Control means for controlling the information recording device,
Based on the discrimination of the recording medium discriminating means,
An information recording apparatus for recording information on a rewritable recording medium or a write-once recording medium, wherein the end processing means switches an end process between the rewritable recording medium and the write-once recording medium. . In an information recording apparatus that records information on a write-once recording medium,
Driver means for reading and writing information on the write-once recording medium;
End processing means for performing end processing based on a recording method on the write-once recording medium via the driver means,
Power supply means for supplying power to the information recording device;
Power supply determining means for determining a supply state of the power supply means,
Control means for controlling the information recording device,
The power supply determining means determines whether the power supply is supplied by a battery or a commercial AC power supply,
An information recording apparatus for recording information on a write-once recording medium, wherein the termination processing means performs termination processing when power is supplied from a commercial AC power supply. In an information recording apparatus that records information on a write-once recording medium,
Driver means for reading and writing information on the write-once recording medium;
End processing means for performing end processing based on a recording method on the write-once recording medium via the driver means,
Power supply means for supplying power to the information recording device;
Power supply determining means for determining a supply state of the power supply means,
Control means for controlling the information recording device,
The power supply determining means determines whether the power supply is supplied by a battery or a commercial AC power supply,
The information recording apparatus for recording information on a write-once type recording medium, wherein the termination processing unit does not perform termination processing when power is supplied from a battery. In an information recording apparatus that records information on a write-once recording medium,
Driver means for reading and writing information on the write-once recording medium;
End processing means for performing end processing based on a recording method on the write-once recording medium via the driver means,
Power supply means for supplying power to the information recording device;
Power supply determining means for determining a supply state of the power supply means,
Control means for controlling the information recording device,
The power supply determining unit determines an amount of power that can be supplied by a battery that supplies power,
An information recording apparatus for recording information on a write-once type recording medium, wherein the termination processing means performs termination processing when the amount of power that can be supplied by the battery is larger than the amount of power used for termination processing. The rewritable recording medium according to claim 1, or an information recording apparatus that records on a write-once recording medium,
Power supply monitoring means for monitoring means for supplying power to the information recording device,
When the power monitoring means determines that the power is supplied by the AC power,
An information recording apparatus for recording on a rewritable recording medium or a write-once recording medium, wherein the end processing is performed on the write-once recording medium by the end processing means. The rewritable recording medium according to claim 11, or an information recording apparatus that records on a write-once recording medium,
Equipped with notification means,
If the power monitoring means determines that power is supplied by the battery,
Without performing end processing on the write-once recording medium by the end processing means,
An information recording apparatus for recording on a rewritable recording medium or a write-once recording medium, wherein the notifying unit notifies that power is supplied from an AC power supply.

Images