JP2000163526A - Sound and video recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate drop-out of information due to vibration or shock and to eliminate an influence of dirt and flaws on the tone quality and the picture quality. SOLUTION: A device main body 1 transmits and receives sound information and video information to and from a recording medium 2 as a radio signal. In the recording medium 2, recording information including sound information and video information is stored in a memory 21 consisting of a non-volatile memory. Consequently, there are no mechanical mobile parts, and further, sound information and video information can be communicated between the device main body 1 and the recording medium 2 without contacting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording recorded information including at least one of sound information and video information on a recording medium, and reading the recorded information from at least the recording medium by means of a removable apparatus body. And a sound / video recording device.

[0002]

2. Description of the Related Art Conventionally, devices for recording sound information and video information include cassette tapes, CDs (compact disks), MDs (mini disks), video tapes, and video Cs.
Various devices such as D and DVD (digital video disk) are known. These devices involve mechanical operations when recording or reproducing sound information or video information,
For example, for cassette tapes and video tapes, the magnetic tape is moved relative to the head, and CD, MD, video C
D and DVD are configured to rotate the disk and move the head in the radial direction of the disk. That is, these devices require a mechanically movable part such as a motor.

On the other hand, as a device capable of recording video information and sound information without using a mechanical movable part, a device such as a digital camera that records video information and sound information in a memory has been considered.

[0004]

By the way, in an apparatus for relatively moving a magnetic tape or a disk and a head,
When subjected to vibration or shock as in the case of mounting on a vehicle, the relative displacement between the magnetic tape or disk and the head occurs, and the sound information and the video information cannot be read out in the recorded order. So-called skipping occurs. Further, maintenance of the mechanically movable part and cleaning of the head are required, and handling is troublesome. Furthermore, it is necessary to bring the magnetic tape or disk into contact with the head or to face the head directly. Therefore, the magnetic tape or disk is exposed, or it can be exposed by opening and closing the shutter. In addition, the magnetic tape or disk is liable to become dirty or scratched, and may become unusable due to the dirt or scratches.

On the other hand, in a device such as a digital camera having no mechanically movable part, there is no information dropout due to vibration or impact, so that there is no phenomenon such as sound skipping, and there is no mechanically movable part. Easy to handle.

However, in this type of apparatus, an electrical connection is made between a recording medium for storing recording information such as sound information and video information, and an apparatus main body for recording and reproducing the recording information on the recording medium. Is currently performed using a connector that brings the conductive portions into contact with each other, and if the conductive portion of the connector becomes dirty or scratched, it may become unusable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent information from being lost due to vibration or impact, and to have no problem in use even if dirt is attached or scratched. It is to provide a sound / video recording device.

[0008]

According to a first aspect of the present invention, there is provided a recording medium including a recording unit for storing recording information including at least one of sound information and video information in a case, and the recording medium is detachably mounted. The apparatus further includes a device main body for reading out recorded information from at least a recording unit without a mechanical operation when a recording medium is mounted, and the recording medium and the device main body include means for transmitting and receiving information by a wireless signal. According to this configuration, information is transmitted and received between the apparatus main body and the recording medium using a wireless signal without a mechanical operation. Even if it is used as an application, a phenomenon such as so-called skipping does not occur. In addition, since no mechanical operation is involved, handling is easy, and maintenance and cleaning are not required. Moreover, since a radio signal is used, dirt or scratches on the case of the recording medium do not affect reading or writing of the recorded information.
Further, since the electrical contact portion is unnecessary, it is not necessary to consider dirt and scratches on the electrical contact portion. As a result, there is no need to consider dirt and scratches, and the handling is easy.

According to a second aspect of the present invention, in the first aspect of the present invention, the recording unit comprises a memory, and the recording medium has a control unit for reading and writing recording information to and from the memory, and demodulates a radio signal. A first demodulation circuit, a first modulation circuit for modulating recording information, which is a digital signal read from a memory, wherein the apparatus main body modulates a digital signal to be sent to a recording medium; And a second demodulation circuit for demodulating a radio signal received from the recording medium.
In this configuration, since the recording information is transmitted and received by the modulated radio signal, the content of the recording information cannot be read even if a demodulation circuit that does not conform to the modulation method is used, and the recording information is read and illegally copied. To some extent.

According to a third aspect of the present invention, in the second aspect, the memory is a non-volatile memory, and the recording medium includes a power supply circuit for generating an internal power supply from a radio signal from the apparatus main body. In this configuration, since the recording information is stored in the non-volatile memory, the recording information can be held without power supply, and a power supply circuit that generates an internal power supply from a wireless signal from the apparatus main body is provided in the recording medium. Since there,
The recording medium does not require a power supply, and consequently does not require battery replacement.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a read-only mode in which only reading of recorded information from the memory is permitted, and reading and writing of recorded information in the memory are permitted. A recording / playback mode to be selected is provided on the recording medium. With this configuration, it is possible to select whether the recording medium is to be read-only or to be recordable / reproducible by the mode setting unit, thereby preventing erroneous erasure of the recording information already recorded in the recording unit.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the mode setting section comprises a code storage section, and an operation section for instructing a change in the contents of the code storage section is provided in the apparatus main body. According to this configuration, when the user operates the operation unit of the apparatus main body, the recording medium can be dedicated to reproduction or can be recorded / reproduced according to the purpose, so that the usability is good.

According to a sixth aspect of the present invention, in the second or third aspect, an identification code setting section for setting an identification code is provided on the recording medium, and the identification code set on the recording medium matches the predetermined code. An access control unit for permitting access to the recording medium when performing the operation is provided on the recording medium. According to this configuration, since the identification code is set in the recording medium and the identification code is determined on the recording medium, if the identification code transmitted from the apparatus main body to the recording medium does not match the identification code of the recording medium, the recording medium is Access to the recording medium is not permitted, and the recording information stored in the recording medium cannot be read or rewritten. For example, it is possible to prevent record information distributed only to a specific group from being read out or rewritten by a third party.

According to a seventh aspect of the present invention, in the sixth aspect, the identification code can be changed in the identification code setting section. According to this configuration,
The recording information can be individualized by setting individual identification codes for each recording medium. For example, if the identification code set on the recording medium is notified only to persons in a specific range, it is possible to limit the range of persons who can read the recorded information.

According to an eighth aspect of the present invention, in the second or third aspect, an identification code setting section for setting an identification code is provided in the apparatus main body, and the identification code transmitted by a radio signal from the apparatus main body is set to a predetermined value. An access control unit for permitting access when the code matches the code is provided in the recording medium. According to this configuration, since the identification code is set in the apparatus main body and the identification code is determined on the recording medium side, the recording medium is stored in the recording medium without permitting access from the apparatus main body to which the identification code does not conform. The recorded information cannot be read or rewritten. For example, an identification code can be set by classifying the apparatus main body according to the type of the user, and whether or not the recording medium can be accessed can be selected for each user.

According to a ninth aspect of the present invention, in the eighth aspect, the identification code can be changed in the identification code setting section. According to this configuration,
It is possible to classify the device bodies by setting individual identification codes for each device body. For example, if an identification code compatible with a recording medium is notified only to a specific range of people, it is possible to limit the range of people who can read recorded information.

According to a tenth aspect of the present invention, in the second or third aspect of the present invention, the recording medium includes a duplication history storage unit for recording the presence or absence of duplication of the recording information between the recording media, and the apparatus main body is used when the duplication is performed. A copy control unit that writes a copy code indicating that the copy has been made into the copy history storage unit of the copy source recording medium and that prohibits copying from the recording medium on which the copy code has been written as the copy source. In this configuration, if the original is copied once, the duplicate code is written, so that the original is not permitted to be copied twice or more, and when the copyright is set to the audio information or the video information, the right is protected.

According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, an identification code input section for inputting an identification code is provided in the apparatus main body, and the identification code input from the identification code input section and transmitted by a radio signal is set to a predetermined value. An access control unit that permits access when the code matches the code is provided on the recording medium, and when access to the recording medium is permitted by a specific identification code, the duplicate code in the duplicate history storage unit can be erased. In this configuration, when the apparatus has the apparatus main body in which a specific identification code is set, the duplicate code can be erased and the duplication can be performed again. For example, CD
In such a rental business, copying is permitted only for personal use. Therefore, by erasing the copy code of the recording medium returned after the rental, the rental can be performed again, and the recording medium can be rented.

According to a twelfth aspect of the present invention, in the second or third aspect of the present invention, the recording medium includes a duplication history storage unit for recording the presence or absence of duplication of the recording information between the recording media, and the apparatus main body is used when the duplication is performed. A copy control unit that writes a copy code indicating that the copy has been made into the copy history storage unit of the copy destination recording medium and prohibits the copy from being performed on the recording medium on which the copy code is written is a copy source. In this configuration, copying from the copied recording medium to another recording medium is not permitted, and this leads to protection of the right when the copyright is set for the audio information or the video information.

According to a thirteenth aspect of the present invention, in the second or the third aspect of the present invention, there is provided an erroneous erasure preventing claw capable of cutting off a case, and the device main body includes a claw detecting portion for detecting the presence or absence of the erroneous erasure preventing claw. A read control unit that permits only reading of recorded information from the recording medium when the nail detection unit detects that the erroneous erasure prevention nail is cut off. According to this configuration, since writing to the recording medium is prohibited by cutting off the erroneous erasure prevention claw, careless erasure or rewriting of the recording information stored in the recording medium is prohibited, and writing is prohibited. Can be visually recognized.

According to a fourteenth aspect of the present invention, in the second or third aspect, the recording medium has a receiving antenna for receiving a radio signal from the main unit, a transmitting antenna for transmitting a radio signal to the main unit, and a receiving antenna. And an erroneous erasure prevention member which is provided so as to be removable on the case so as to straddle a part of the case and makes the receiving antenna unreceivable when removed. According to this configuration, since writing to the recording medium is prohibited by cutting off the erroneous erasure prevention body, careless erasure or rewriting of recording information stored in the recording medium is prohibited, and writing is prevented. Can be visually recognized.

According to a fifteenth aspect of the present invention, in the second or third aspect of the present invention, the apparatus main body is provided with a compression unit for compressing when recording information is written to a recording medium. According to this configuration, since the recording information is compressed and written on the recording medium, the amount of information that can be stored in the recording unit of the recording medium can be increased without deteriorating the quality of the recording information.

According to a sixteenth aspect of the present invention, in the second or third aspect, the apparatus main body is provided with a decompression section for decompressing the recording information when the recording information is compressed when reading the recording information from the recording medium. Thus, the reproduction time of the sound information or the video information can be made relatively long while using a recording medium having a relatively small capacity, and the reproduction can be performed for a long time even with a small recording medium.

According to a seventeenth aspect of the present invention, in the second or third aspect, a retransmission request unit for retransmitting the recording information to the recording medium when the apparatus main body detects a transmission error when reading the recording information from the recording medium. Even if a transmission error occurs due to external noise or the like, the same recorded information is retransmitted, so that the recorded information becomes unreproducible or the quality of sound information or video information obtained by reproducing the recorded information is reduced. Can be prevented.

According to an eighteenth aspect, in the seventeenth aspect, the apparatus main body temporarily stores the recording information read from the recording medium and adjusts the recording information read from the recording medium to an appropriate speed and outputs the adjusted information. Since the recorded information once stored in the buffer memory is reproduced, the recorded information stored in the buffer memory is pre-read for the reproduced sound information or video information. While the retransmission is being performed for a transmission error or the like as in the configuration of claim 17, by continuing to reproduce the recorded information stored in the buffer memory,
The sound information and video information being reproduced are not interrupted.

According to a nineteenth aspect, in the second or third aspect, a plurality of recording media can be mounted on the apparatus main body, and the apparatus main body recognizes the mounting position of each recording medium and recognizes the mounting position. Is provided with an access order control unit that accesses each recording medium in the order defined based on the storage medium, so that a plurality of recording media are mounted on the apparatus body while using a recording medium with a relatively small storage capacity. This makes it possible to record and reproduce sound information and video information continuously over a relatively long time.

[0027]

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

(Embodiment 1) The audio / video recording apparatus of the present embodiment includes an apparatus main body 1 and a recording medium 2. In the embodiment described below, it is assumed that both the sound information such as music and the video information such as a still image are stored as the recording information to be stored in the recording medium 2. And video information.
The video information is not limited to a still image, and may be a moving image.

As shown in FIG. 1, the apparatus main body 1 has an external input / output unit 11 for connecting an external device. The external devices connected to the external input / output unit 11 include a device for inputting sound information and video information, and a device for outputting the sound information and video information to a speaker and a display device for reproduction. Although the recorded information including the sound information and the video information is handled as a digital signal inside the apparatus main body 1, the external input / output unit 11 may be provided with an analog signal input / output unit. In this case, the external input / output unit 11 is provided with a converter for mutually converting a digital signal and an analog signal.

The sound information and the video information input from the external input / output unit 11 are given as recording information to the modulation circuit 13 through the control unit 12, and the modulation circuit 13 digitally modulates the recording information, And transmits it as a wireless signal. The radio signal received by the antenna 16 is input to the demodulation circuit 14 through the transmission / reception unit 15, and the recording information extracted by the demodulation circuit 14 is transmitted to the control unit 12.
, Sound information and video information output from the control unit 12 are output from the external input / output unit 11 to an external device. further,
The apparatus main body 1 has a keypad 17 for instructing reading, writing, stopping, etc. of the recording medium 2 and for inputting numerical values.
A dip switch 18 serving as an identification code setting unit described later is provided.

On the other hand, the recording medium 2 has an antenna 26 for transmitting and receiving radio signals to and from the apparatus main body 1.
The radio signal received by the demodulation circuit 2
The recording information input to the demodulation circuit 4 and extracted by the demodulation circuit 24 is stored in a memory 21 composed of a non-volatile memory such as an EEPROM through a control unit 22. The recording information stored in the memory 21 is read out by the control unit 22, digitally modulated by the modulation circuit 23, and transmitted as a wireless signal through the transmission / reception unit 25 and the antenna 26. Between the device body 1 and the recording medium 2, recording information is transmitted using radio waves as a radio signal, or the antennas 16 and 26 of the device body 1 and the recording medium 2 are transformer-coupled to each other to convert a magnetic field into a radio signal. The recording information is transmitted by using the information. The recording medium 2 is provided with a power supply circuit 27 for generating an internal power supply based on a radio signal from the apparatus main body 1, and a dip switch 2 serving as an identification code setting unit described later.
8 is also provided.

As described above, the recording medium 2 is supplied with power by a radio signal from the apparatus main body 1 and is stored in a non-volatile manner in the memory 21 so that the recording information stored in the memory 21 is not lost even without power supply. Because it uses memory,
There is no need to provide a power source such as a battery in the recording medium 2, and maintenance such as battery replacement is not required.

A digital signal is transmitted between the apparatus main body 1 and the recording medium 2, and a data packet is transmitted in the same manner as in normal data communication.

As described above, the recording information includes sound information and video information. The sound information is sampled at a sampling frequency that is about twice the upper limit of the audible frequency (40 kHz), and then quantized into a digital signal. If it converts, it depends on the number of quantization bits,
General sound information is about 10 Mbytes per minute. If sound information is digitized to have this amount of information, CD
High quality can be obtained. Since the upper limit of the capacity of the nonvolatile memory provided as a card-type memory is currently about 96 Mbytes, music can be recorded for about 10 minutes by using this. If the size can be increased, the storage capacity of the memory 21 is set to 600M.
It is also possible to have a capacity on the order of bytes, which is about the same as a CD. Furthermore, if the sampling frequency is set lower than that of the CD as in the case of the MD, some high frequency components are sacrificed, but the amount of information can be reduced without extremely lowering the quality. It is possible to extend the recordable time for 21 capacities. Therefore, it is also possible to select which of the sound quality and the recording time is prioritized according to the purpose such as recording of music or recording of a lecture or a conference.

With respect to video information, an information amount of about 3 Mbytes is required to obtain a quality such that a still image is displayed on the entire screen of a television receiver. With this amount of information, a currently available nonvolatile memory can be used, and with a capacity of about 96 Mbytes as described above, 30 or more still images can be recorded. is there. If a large-capacity memory is used, moving images can be recorded as video information.

Here, by using the information compression technique, it is possible to increase the amount of information that can be stored in the memory 21 without significantly deteriorating the quality of the recorded information. desirable. When the information compression technology is used, the compression and decompression of information are performed by the main unit 1
Perform in. That is, the control unit 12 of the apparatus main body 1 includes a compression unit that compresses when recording information stored in the memory 21 is written, and a decompression unit that expands when reading recording information that is compressed by the compression unit and stored in the memory 21. To achieve.
When a compression / decompression program such as LHA or ZIP is used as the compression unit and the decompression unit, the data amount of the recorded information is about 20 to 30% as compared with a case where this type of program is not used. The amount of information that can be stored in the memory 21 increases. That is, even when the storage capacity of the recording medium 2 is relatively small, recording and reproduction can be performed for a relatively long time.

As shown in FIG. 2, the apparatus main body 1 includes a housing 10, and a keypad 17 and a dip switch 18 are exposed on the front surface of the housing 10. A slot 19 through which the recording medium 2 can be inserted and removed is opened on the front surface of the housing 10. In the slot 19, holding means (not shown) is provided.
, The recording medium 2 is held at a fixed position. In a case where a configuration in which a part of the recording medium 2 is inserted into the slot 19 is adopted, the recording medium 2 can be taken out of the housing 10 by pinching and pulling out the protruding portion of the recording medium 2 from the housing 10. . When the entire recording medium 2 is inserted into the slot 19, an ejection button may be provided so that the recording medium 2 is ejected from the slot 19 when the ejection button is operated.

The recording medium 2 is a card type case 20.
The dip switch 28 is exposed on one surface of the front and back of the case 20. There is no exposed member other than the dip switch on the outer surface of the case 20, so that foreign matter such as dust does not easily enter the inside of the case 20. As described above, since radio waves or magnetic fields are used as radio signals between the apparatus main body 1 and the recording medium 2, the case 2
Even if 0 is soiled or the case 20 is damaged, transmission of recording information between the apparatus main body 1 and the recording medium 2 does not hinder. Moreover, since the read and write of the record information is performed without the mechanical operation using the radio signal, the read and write of the record information is not affected by the vibration or the shock, and the apparatus main body 1 and the recording medium are not affected. Since it is close to 2, it is hardly affected by external noise. As a result, even in an environment such as an in-vehicle environment where vibrations and shocks are generated and external noise is relatively large, it is difficult for information to drop out, and so-called sound skipping does not occur.

Hereinafter, the function of the present embodiment will be described in more detail. The memory 21 stores a security code as recording information in addition to the sound information and the video information.
FIG. 3 shows a memory map of the memory 21. As shown in FIG. 3, the security code is stored in a code area D1 which is a head portion (addresses 0 to 4) of the memory 21. In the illustrated example, one type of information is stored at one address of the code area D1, and a total of five types of information are stored in the memory 21 as security codes. The address higher than the code area D1 storing the security code is an information area D2 storing audio information and video information.

The addresses assigned as the code area D1 are, from the lowest order, a code storage unit C1, an identification code storage unit C2, a copy history storage unit C3, a compatible code storage unit C4, and a serial number storage unit C5. Information is stored.

The code storage unit C1 is an area for writing contents for designating a read-only mode for permitting only reading of recorded information and a recording / reproducing mode for permitting both reading and writing of recorded information. "0" for playback only mode, "1"
To the recording / playback mode. When the content of the code storage unit C1 is in the reproduction-only mode, the control unit 2 of the recording medium 2
2 prohibits writing of sound information and video information to the memory 21.

Since the reproduction only mode or the recording / reproducing mode can be selected by rewriting the contents of the code storage unit C1, the contents of the code storage unit C1 can be changed using the keypad 17 in the apparatus main body 1. It is like that. Therefore, if the reproduction only mode is instructed from the apparatus main body 1 to the recorded recording medium 2 and written in the code storage unit C1, it is possible to prevent the recorded contents from being accidentally erased. Further, when another record information is to be recorded on the recorded recording medium 2, the recording medium 2 can be made recordable by instructing the recording / reproducing mode from the apparatus main body 1 and writing it into the code storage unit C 1. . As described above, the code storage unit C1 to the keypad 17 constitute a mode setting unit.

The identification code storage section C2 is an area for writing a 4-bit identification code. The control unit 22 of the recording medium 2 collates the identification code stored in the memory 21 with the identification code transmitted from the apparatus main body 1. When the identification code stored in the identification code storage unit C2 is “0000”, the access (recording or reproduction) from the apparatus main body 1 to the recording medium 2 regardless of whether the identification code is transmitted from the apparatus main body 1 or not. ) Becomes possible. That is, reproduction or recording / reproduction on the recording medium 2 can be performed by all the apparatus main bodies 1.

On the other hand, when the identification code is other than "0000", access to the recording medium 2 becomes possible only when the identification code transmitted from the apparatus main body 1 matches the identification code. The identification code from the apparatus main body 1 is input through the keypad 17. That is, when the recording medium 2 whose identification code is not “0000” is inserted into the slot 19 of the apparatus main body 1, the identification code is input using the keypad 17 and the input identification code is stored in the recording medium 2.
If the identification code does not match, the recording medium 2 cannot be accessed. By setting the identification code in this way, access to the recording medium 2 is not permitted for a user who does not know the identification code, and access to the recording medium 2 can be restricted.

In the illustrated example, the dip switch 28 of the recording medium 2 functions as an identification code setting unit, and the identification code written in the identification code storage unit C2 can be changed by operating the dip switch 28.
In this case as well, if the DIP switch 28 is carelessly operated, the identification code is changed, and the identification code becomes “000”.
If it is set to "0", the access cannot be restricted. Therefore, when the access is restricted, it is desirable to provide the DIP switch 28 at a place where the operation becomes difficult, or to realize an equivalent function by a circuit pattern.

When the identification code is set by the DIP switch 28, the identification code storage section C2 is not always necessary. When the identification code storage section C2 is provided, the DIP switch 28 does not necessarily have to be provided. If it is necessary to change the contents of the identification code storage unit C2 without providing the DIP switch 28, the keypad 17 of the apparatus main body 1 is used as an operation unit, and the identification code registered in the identification code storage unit C2 is used. The identification code can be changed by inputting, and then a new identification code may be input using the same keypad 17.

In the copy history storage section C3, a 1-bit copy code is written. That is, the copy code is “0”
And "1", "0" indicates that copying is possible, and "1" indicates that copying is not possible. How to use the duplicate code will be described later.

The compatible code storage unit C4 has almost the same function as the identification code storage unit C2, but the identification code stored in the identification code storage unit C2 is input using the keypad 17 in the apparatus main body 1. On the other hand, the matching code is checked against the identification code thus set, while the matching code is checked against the machine number code (also a kind of the identification code) set in the apparatus main body 1. That is, the machine number code is not input to the apparatus main body 1 like the identification code, but is set uniquely to the apparatus main body 1. The compatible code is also 4 bits like the identification code, and when it is "0000", it can be accessed regardless of the machine number code of the apparatus main body 1.

When the compatible code is other than "0000", access to the recording medium 2 from the apparatus body 1 is permitted only when the machine number code set in the apparatus body 1 matches the compatible code.

In the illustrated example, the DIP switch 18 provided on the apparatus main body 1 serves as an identification code setting section for setting the machine number code.
It can be set by a bit dip switch 18. However, in the configuration in which the DIP switch 18 is exposed as in the illustrated example, it is easy to change the machine number code of the apparatus main body 1. Therefore, when restricting access to the recording medium 2 by the machine number code, the DIP switch 18 is used. Is desirably provided in a place where operation is difficult, or equivalent functions are provided by a circuit pattern instead of the dip switch.

In the above-described example, the collation of the identification code and the machine number code is performed by the recording medium 2, but may be performed by the control unit 12 of the apparatus main body 1. That is, the apparatus main body 1 reads the identification code and the compatible code of the recording medium 2 and
The control unit 12 of the apparatus main body 1 may collate with the identification code and the machine number code set in the apparatus main body 1. Alternatively, the identification code of one of the apparatus main body 1 and the recording medium 2 may be collated, and the other may be collated with the device number code. As is apparent from the above description, the control units 12 and 22 for the apparatus main body 1 and the recording medium 2 function as access control units for restricting access to the recording medium 2 from the apparatus main body 1.

The serial number storage section C5 stores a serial number represented by a serial number of 16 bits in the order of manufacturing the recording medium 2. However, since the serial number immediately reaches the upper limit with 16 bits, the serial number is cyclically assigned. In other words, after reaching the upper limit, the serial number is again assigned with a serial number from the lower limit.

A method of using the copy code in the copy history storage unit C3 will be described with reference to FIG. FIG.
Is a flowchart in the case of instructing the start of copying.
Since only one slot 19 is provided in the apparatus main body 1, two recording media 2 are replaced and duplicated.

First, when copying is instructed with the recording medium 2 to be copied inserted into the slot 19 of the apparatus main body 1, an identification code is requested. Therefore, the identification code is input from the keypad 17 of the apparatus main body 1 ( S1). When the input identification code matches the identification code set in the recording medium 2, the identification code can be changed (S2). Here, if a new identification code is input (S3), the identification code is changed, and the state returns to the state where the identification code is input (S1). Also, if the operation is performed without entering the identification code,
If the identification code of the recording medium 2 is not "0000", the recording medium 2 notifies the apparatus body 1 that the identification code is incorrect (S4). Here, if the identification code is incorrectly made twice consecutively, the power supply to the apparatus main body 1 is stopped (S5).

If the identification code is not changed in step S2, the set contents of the code storage section C1 are checked on the recording medium 2 after a certain period of time (S6). The notification is sent to the apparatus main body 1 (S7). That is, the recording medium 2 can be reproduced only. When the setting content of the code storage unit C1 indicates the recording / reproducing mode, the setting content of the copy history storage unit C3 is checked on the recording medium (S8), and if the copy code is "1", copying is impossible. Then, it notifies the device main body 1 that copying is not possible (S9), and notifies that it is for reproduction only (S7).

The copy code of the copy history storage unit C3 is "0"
If so, the copy is possible, so the device main body 1 is notified that the copy is possible (S10), and the copy is started (S11). Thereafter, the recording information is copied to another copy destination recording medium 2 by appropriately replacing the recording medium 2. However, when the copy destination recording medium 2 is read-only, the fact is notified. The copy code of the copy history storage unit C3 is set to "1" in the copy destination recording medium 2 in which the record information is copied in this manner (S12).
Copying from the recording medium 2 to another recording medium 2 is prohibited. In other words, the information on the recording medium 2 that is the copy destination is prohibited from being copied again and is copied only once, so that the rights such as the copyright set in the recorded information can be protected. Here, the function as a duplication control unit that prohibits duplication when the duplication code is “1” is realized by the control unit 12 of the apparatus main body 1. By setting the copy code of the recording medium 2 of the copy destination as well as the copy source to “1”, it is also possible to prohibit the creation of a copy using the recording medium 2 of the copy destination as the copy source.

Incidentally, in the CD rental business and the like, copying is permitted only once for personal use only.
In order to use the recording medium 2 in this embodiment in the rental business, the rental code must be able to be erased by the rental company. In other words, the copy code of the recording medium 2 borrowed from the rental company is “0”, and the copy code is set to “1” after one copy. If the copy code of is changed to “0” again, rental can be performed again.

Therefore, as shown in FIG. 5, a rental store-specific identification code issued only to the rental agent is input from the keypad 17 of the apparatus main body 1 (S21), and this identification code is set on the recording medium 2. When the control unit 22 determines that the code matches the specified code, the copy code can be changed (S22). That is, the keypad 17 functions as an identification code input unit. In this state,
The apparatus main body 1 can set the copy code written in the copy history storage section C3 of the recording medium 2 to "0" (S23). Thus, at the next rental, the copy code can be set to “0” and rented out.
Can be used as a replication source only once.

As described above, since the recording information is transmitted between the apparatus main body 1 and the recording medium 2 by radio signals, the influence of external noise and the like when reading the recording information from the recording medium 2 is reduced. When received, the quality of sound information or video information to be reproduced may be degraded. Therefore, the control unit 12 of the apparatus main body 1 monitors the presence or absence of a transmission error of each data packet when reading the recording information from the recording medium 2 and detects a transmission error when there is a transmission error with respect to the recording medium 2. A function of a retransmission request unit for requesting retransmission of a data packet is provided. That is, when a transmission error occurs, it is considered that the quality of the reproduced sound information or video information is degraded. Therefore, a retransmission request unit is provided to suppress such a decline in quality. Here, the upper limit value of the number of retransmission requests is set to about 2 to 3 times.

On the other hand, when the retransmission is requested, the control unit 1 controls the reproduction of the audio information and the video information so as not to be interrupted.
2 is provided with a buffer memory. That is, the buffer memory is a memory for temporarily storing the recording information read from the recording medium 2, and maintains the speed at which the data is output from the buffer memory constant regardless of the speed at which the data is input to the buffer memory. It has a function to adjust the speed. By using such a buffer memory, the reproduction speed can be kept constant irrespective of the speed at which the recorded information is read from the recording medium 2. In other words, by pre-reading the recording information with respect to the audio information and video information to be reproduced, even if the reading of the recording information is temporarily interrupted during retransmission, the audio information and the video information can be reproduced without interruption. is there. By using this buffer memory, it is possible to prevent interruption of reproduction of audio information and video information even when retransmission is requested.

The buffer memory need only have a storage capacity capable of storing about several seconds of audio information and video information, since the reproduction of audio information and video information is not interrupted during a retransmission request. If the storage capacity of the buffer memory can be set to the same level as that of the recording medium 2, the recording medium 2
May be read out and stored in the buffer memory, and then reproduced. In the case of employing such a configuration, by setting the upper limit of the number of retransmissions to be more than two or three times, it is possible to further suppress the deterioration of the quality of sound information and video information due to transmission errors. Alternatively, the storage capacity used as the buffer memory may be adjustable by the user. The retransmission request unit and the buffer memory are used not only during normal reproduction of sound information and video information but also during duplication.

(Second Embodiment) In the first embodiment, whether the recording medium 2 is read-only or recordable / reproducible is determined by the information written in the memory 21 provided in the recording medium 2. In this case, whether the recording medium 2 is read-only or recording / reproducing is selected according to the presence or absence of the erroneous erasure prevention claw 20a provided on the side surface of the case 20 of the recording medium 2. The erroneous erasure prevention claw 20a is provided so as to be cuttable from the case 20, and is made exclusive for reproduction by being cut off using a driver or the like.

Whether or not the erroneous erasure preventing claw 20a has been cut is detected by a claw detecting section 10a formed of a microswitch provided inside the slot 19 of the apparatus main body 1.
When the erroneous erasure prevention claw 20a is not cut off, the nail detection unit 10a is pressed by the erroneous erasure prevention claw 20a to be turned on. Further, a recess (not shown) is formed on the back side of the erroneous erasure prevention claw 20a in the case 20, and when the erroneous erasure prevention claw 20a is cut off, the claw detection unit 10 is formed.
a cannot be maintained in the on state by entering the recess, and is turned off. In this manner, the presence or absence of the erroneous erasure prevention claw 20a can be determined by the apparatus main body 1. In addition, the fact that the erroneous erasure prevention claw 20a is cut off allows the user to visually recognize that the claw 20a is exclusively for reproduction. Other configurations and operations are the same as those of the first embodiment.

(Embodiment 3) In this embodiment, an erroneous erasure preventive body 20b is provided on the side surface of the case 20, as in Embodiment 2. In the present embodiment, as the antenna 26 of the recording medium 2, a loop-shaped receiving antenna 26 a formed along one of the front and back surfaces of the case 20 and a receiving antenna 26
and a transmission antenna 26b in the form of a loop antenna disposed inside the transmission antenna 26a. A part of the erroneous erasure prevention body 20b is formed so as to straddle a part of the receiving antenna 26a, and the erroneous erasure prevention body 20b can be cut off by being separated from the case 20. That is, the erroneous erasure prevention body 20b is a tape-shaped member, and when cut off from the case 20, a part of the receiving antenna 26a is cut off,
a stops functioning. As a result, only transmission is possible, and the recording medium 2 operates as read-only. Even with this configuration, it can be visually recognized that the data is exclusively for reproduction. Other configurations and operations are the same as those of the first embodiment.

(Embodiment 4) In each of the above embodiments,
The example in which one recording medium 2 can be mounted on one apparatus main body 1 has been described. However, in the present embodiment, a plurality of recording media 2 can be mounted on one apparatus main body 1. . The configuration in which the plurality of recording media 2 are mounted in the apparatus main body 1 includes a configuration in which the plurality of recording media 2 is mounted in another cartridge and the cartridge is mounted in one slot 19 provided in the apparatus main body 1. A configuration in which a plurality of slots 19 in which each one of them 2 can be mounted is provided in the apparatus main body 1, the apparatus main body 1
Any one of the configurations in which a plurality of recording media 2 are sequentially inserted into one slot 19 provided in the above may be adopted.

In any configuration, the apparatus main body 1 is provided with an access order control unit for recognizing the mounting position of each recording medium 2 and accessing (recording or reproducing) each recording medium 2 in a prescribed order. This access order control unit is included in the control unit 12.

When a mechanism for mounting a plurality of recording media 2 in one slot is adopted, all recording media 2
Are stored within a range in which a wireless signal can be transmitted and received with the antenna 16 of the apparatus main body 1, and the access order control unit recognizes the mounting position of each recording medium 2 based on the intensity of the transmitted and received wireless signal. In the case of this configuration, it is sufficient to provide the apparatus body 1 with the antenna 16 shared by the plurality of recording media 2. When a plurality of slots 19 are provided, an antenna 16 is required for each slot 19. However, the access order control unit detects the presence or absence of the recording medium 2 in each slot 19, Can be recognized.

Unless otherwise specified, the access order control unit accesses each recording medium 2 in the order in which the users are arranged. For example, assuming that a cartridge capable of mounting the recording media 2 vertically and vertically is used, each recording medium 2 is accessed sequentially from bottom to top, and a plurality of slots 19 are vertically arranged. The recording medium 2 inserted in each slot 19 is accessed sequentially from bottom to top, or, if a plurality of recording mediums 2 are inserted into one slot 19, the recording medium 2 inserted first is accessed sequentially. You do it.

As described in the first embodiment, the memory 21 used for the recording medium 2 has a storage capacity of about 10 minutes for music at the current technical level.
On the other hand, records, cassette tapes, CDs, MDs and the like conventionally provided as music media all have a storage capacity of about one hour. Therefore, if a plurality of recording media 2 can be attached to the apparatus main body 1 as in the present embodiment, recording / reproduction over a long period of time can be performed as long as a conventional music medium without replacing the recording media 2. Will be possible.

In particular, if one piece of music (music of 10 minutes or less) is recorded on one recording medium 2 and the apparatus main body 1 is configured so that about ten recording media 2 can be mounted. ,
It is possible to use the same music as an album in which about 10 music pieces of about 5 to 10 minutes are recorded in one medium. By adopting such a usage pattern, it is possible not only to reproduce each song in sequence like an album, but also to change the reproduction order by changing the mounting position (arrangement) of the recording medium 2. It is also possible to do. Further, in the conventional album, all the songs recorded in the album were sold collectively, but in the above-described form, each song can be sold individually, and the purchaser side It is also possible to select and purchase only favorite songs.

In the above-described example, the access order is fixedly determined at the mounting position of the recording medium 2, but the user sets the order of accessing the recording medium 2 by giving an instruction to the access order control unit. May be configured.

[0072]

According to the first aspect of the present invention, there is provided a recording medium having a recording unit for storing recording information including at least one of sound information and video information in a case, and a recording medium having a recording medium detachably mounted thereon. An apparatus main body that reads out recorded information from at least the recording section without mechanical operation at the time of mounting is provided, and the recording medium and the apparatus main body are provided with means for transmitting and receiving information by a wireless signal, and the apparatus main body, the recording medium, Since information is transmitted and received using wireless signals without mechanical operation between the devices, there is no loss of information due to vibration or impact, and even when used for vehicles or portable devices, such as so-called sound skipping There is an advantage that no phenomenon occurs. In addition, since no mechanical operation is involved, handling is easy, maintenance and cleaning are unnecessary, and since radio signals are used, dirt or scratches on the recording medium case affect reading or writing of recorded information. Since there is no need for electrical contacts, there is no need to consider dirt and scratches on the electrical contacts, and consequently there is no need to consider dirt and scratches, and handling is easy. There is an advantage.

According to a second aspect of the present invention, in the first aspect of the present invention, the recording unit comprises a memory, the recording medium includes a control unit for reading and writing recording information from and to the memory, and demodulates a radio signal. A first demodulation circuit, a first modulation circuit for modulating recording information, which is a digital signal read from a memory, wherein the apparatus main body modulates a digital signal to be sent to a recording medium; And a second demodulation circuit for demodulating a radio signal received from the recording medium,
Since the recorded information is transmitted and received using a modulated radio signal, the contents of the recorded information cannot be read even if a demodulation circuit that does not conform to the modulation method is used, and the recorded information is prevented from being read and illegally copied to some extent. Has the effect of doing

According to a third aspect of the present invention, in the second aspect, the memory is a non-volatile memory, and the recording medium includes a power supply circuit for generating an internal power supply from a radio signal from the apparatus main body. Since the recording information is stored in the non-volatile memory, the recording information can be held without power supply, and the power supply circuit for generating the internal power from the wireless signal from the apparatus main body is provided in the recording medium. Has the advantage that no power supply is required and consequently no battery replacement is required.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a read-only mode for permitting only reading of recorded information from a memory and a reading and writing of recorded information for a memory are permitted. The recording medium is provided with a mode setting section for selecting a recording / reproducing mode to be used.The mode setting section can select whether the recording medium is for reproduction only or for recording / reproduction. There is an advantage that erasure of recorded information by mistake is prevented.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the mode setting unit comprises a code storage unit, and an operation unit for instructing a change in the contents of the code storage unit is provided in the apparatus main body. By operating the operation unit of the apparatus main body, there is an advantage that the recording medium can be made read-only or recordable / reproducible according to the purpose, and the usability is good.

According to a sixth aspect of the present invention, in the second or third aspect, an identification code setting section for setting an identification code is provided on a recording medium, and the identification code set on the recording medium matches the predetermined code. The recording medium is provided with an access control unit for permitting access to the recording medium when the identification code is set on the recording medium and the identification code is determined on the recording medium. If the identification code does not match the identification code of the recording medium, access to the recording medium is not permitted, and the recording information stored in the recording medium cannot be read or rewritten. As a result, for example, it is possible to prevent record information to be distributed only to a specific group from being read by a third party or rewritten.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the identification code can be changed in the identification code setting section, and each identification code is set for each recording medium. Since the recorded information can be individualized, for example, if the identification code set on the recording medium is notified only to a specific range of people, it is possible to limit the range of people who can read the recorded information become.

According to an eighth aspect of the present invention, in the second or third aspect, an identification code setting section for setting an identification code is provided in the apparatus main body, and the identification code transmitted by a radio signal from the apparatus main body is set to a predetermined value. An access control unit that permits access when the code matches the code is provided on the recording medium, and the identification code is set in the apparatus main body and the identification code is determined on the recording medium side. Since the access from the apparatus main body is not permitted, the recording information stored in the recording medium cannot be read or rewritten. As a result, for example, the identification code can be set by classifying the device body according to the type of the user,
It is possible to select whether or not to access the recording medium for each user.

A ninth aspect of the present invention is characterized in that, in the invention of the eighth aspect, the identification code can be changed in the identification code setting section, and individual identification codes are set for each apparatus main body. Since it is possible to classify the apparatus main body, for example, if the identification code compatible with the recording medium is made known only to persons in a specific range, the range of persons who can read the recorded information can be limited. Will be possible.

According to a tenth aspect of the present invention, in the second or third aspect of the present invention, the recording medium includes a duplication history storage unit for recording the presence or absence of duplication of the recording information between the recording media, and the apparatus main body is used when the duplication is performed. A copy control unit for writing a copy code indicating that the copy has been made in the copy history storage unit of the copy source recording medium, and prohibiting the copy medium from which the copy code has been written to be a copy source; In this case, if the original is duplicated once, the duplicate code is written, so that duplication from the original twice or more is not permitted, which leads to protection of the right when copyright or the like is set to the audio information or the video information.

According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, an identification code input section for setting an identification code is provided in the apparatus main body, and the identification code input from the identification code input section and transmitted by a radio signal is set to a predetermined value. An access control unit that permits access when the code matches the code is provided on the recording medium, and when access to the recording medium is permitted by a specific identification code, the copy code in the copy history storage unit can be erased. In the case where the apparatus has an apparatus main body in which the identification code is set, the duplicate code can be erased and the duplication can be performed again. As a result, for example, by erasing the copy code of the recording medium returned after being lent in the rental business, it is possible to rent again, and the recording medium can be rented.

According to a twelfth aspect of the present invention, in the second or third aspect of the present invention, the recording medium includes a duplicate history storage unit for recording the presence or absence of duplication of the record information between the recording media, and the apparatus main body is used when the duplication is performed. A copy control unit for writing a copy code indicating that the copy has been made in the copy history storage unit of the copy destination recording medium and prohibiting the copy from being performed on the recording medium on which the copy code is written; Copying from the recorded recording medium to another recording medium is not permitted, and when copyright or the like is set to the audio information or the video information, the right is protected.

According to a thirteenth aspect of the present invention, in accordance with the second or third aspect of the present invention, there is provided an erroneous erasure preventing claw whose case can be cut off, and the apparatus main body includes a claw detecting portion for detecting the presence or absence of the erroneous erasure preventing claw. A read control unit that permits only reading of recorded information from the recording medium when the nail detecting unit detects the removal of the erroneous erasure preventing nail. Is prohibited, careless erasure or rewriting of the recording information stored in the recording medium is prohibited, and it can be visually recognized that the writing is prohibited.

According to a fourteenth aspect of the present invention, in the second or third aspect, the recording medium has a receiving antenna for receiving a radio signal from the apparatus main body, a transmitting antenna for transmitting a radio signal to the apparatus main body, and a receiving antenna. And an erroneous erasure preventive body that is provided in the case so as to be able to straddle a part of the erroneous eraser and that disables transmission of the receiving antenna at the time of removal. Since this is prohibited, careless erasure or rewriting of the recording information stored in the recording medium is prohibited, and it can be visually recognized that the writing is prohibited.

According to a fifteenth aspect of the present invention, in the second or third aspect of the present invention, the apparatus main body is provided with a compression means for compressing the recording information when writing the recording information to the recording medium. Therefore, there is an advantage that the amount of information that can be stored in the recording unit of the recording medium can be increased without deteriorating the quality of the recording information.

According to a sixteenth aspect of the present invention, in the second or third aspect of the present invention, the apparatus main body is provided with a decompression means for decompressing the recorded information when the recorded information is compressed when reading the recorded information from the recording medium. Thus, the reproduction time of the sound information or the video information can be made relatively long while using a recording medium having a relatively small capacity, and there is an effect that the reproduction can be performed for a long time even with a small recording medium.

A seventeenth aspect of the present invention is the retransmission request means according to the second or third aspect, wherein the apparatus body retransmits the recording information to the recording medium when detecting a transmission error when reading the recording information from the recording medium. Even if a transmission error occurs due to external noise or the like, the same recorded information is retransmitted, so that the recorded information becomes unreproducible or the quality of sound information or video information obtained by reproducing the recorded information is reduced. There is an effect that it can be prevented. In other words, it can be used even in an environment where external noise is relatively high, such as in a car.

According to an eighteenth aspect of the present invention, in accordance with the seventeenth aspect, the apparatus main body temporarily stores the recording information read from the recording medium and adjusts the recording information read from the recording medium to an appropriate speed for output. Since the recorded information once stored in the buffer memory is reproduced, the recorded information stored in the buffer memory is pre-read for the reproduced sound information or video information. While the retransmission is being performed for a transmission error or the like as in the configuration of claim 17, by continuing to reproduce the recorded information stored in the buffer memory,
There is an effect that sound information and video information being reproduced are not interrupted.

The invention of claim 19 is the invention according to claim 2 or 3, wherein a plurality of recording media can be mounted on the apparatus main body, and the apparatus main body recognizes the mounting position of each recording medium and recognizes the mounting position. Is provided with an access order control unit that accesses each recording medium in the order defined based on the storage medium, so that a plurality of recording media are mounted on the apparatus body while using a recording medium with a relatively small storage capacity. Thus, there is an advantage that it is possible to continuously record and reproduce sound information and video information over a relatively long time.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view showing the appearance of the above.

FIG. 3 is a diagram showing a memory map of the recording medium according to the first embodiment.

FIG. 4 is an operation explanatory diagram of the above.

FIG. 5 is an operation explanatory view of the above.

FIG. 6 is a perspective view of a main part showing Embodiment 2 of the present invention.

FIG. 7 is a perspective view showing a recording medium used in Embodiment 3 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Recording medium 10 Case 12 Control part 13 Modulation circuit 14 Demodulation circuit 15 Transmission / reception part 16 Antenna 17 Keypad 18 Dip switch 20 Case 20a Erroneous erasure prevention claw 20b Erroneous erasure prevention body 21 Memory 22 Control part 23 Modulation circuit 24 Demodulation circuit 25 transmitting / receiving unit 26 antenna 26a receiving antenna 26b transmitting antenna

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B058 CA17 CA27 CA28 KA02 KA04 KA27 KA31 YA16 5C052 AA02 CC06 CC11 CC20 EE10 GA00 GA07 GB00 GB01 GB07 GC05 GE06 GE08

Claims (19)

[Claims] 1. A recording medium provided in a case with a recording section for storing recording information including at least one of sound information and video information, and a recording medium is detachably mounted and a mechanical operation is performed when the recording medium is mounted. An audio / video recording apparatus, comprising: an apparatus main body that reads out recording information from at least a recording unit, and a unit that exchanges information with a recording medium and an apparatus main body by a wireless signal. 2. The recording section comprises a memory, and the recording medium comprises:
A control unit for reading and writing recording information to and from a memory, a first demodulation circuit for demodulating a radio signal, and a first modulation circuit for modulating recording information as a digital signal read from the memory And a second modulation circuit for modulating a digital signal to be sent to the recording medium, and a second demodulation circuit for demodulating a radio signal received from the recording medium. Audio / video recording device. 3. The sound / voice memory according to claim 2, wherein the memory is a non-volatile memory, and the recording medium includes a power supply circuit for generating an internal power supply from a radio signal from the apparatus main body.
Video recording device. 4. A recording medium is provided with a mode setting unit for selecting a reproduction-only mode for permitting only reading of recorded information from a memory and a recording / reproducing mode for permitting reading and writing of recorded information to a memory. The audio / video recording apparatus according to claim 2 or 3, wherein: 5. The mode setting section comprises a code storage section,
5. The audio / video recording apparatus according to claim 4, further comprising an operation section for instructing a change in the contents of the code storage section, in the apparatus main body. 6. An identification code setting unit for setting an identification code is provided on a recording medium, and access to the recording medium is permitted when the identification code set on the recording medium matches the identification code transmitted from the apparatus main body. 4. The audio / video recording device according to claim 2, wherein the access control unit is provided on a recording medium. 7. The audio / video recording apparatus according to claim 6, wherein the identification code setting section is capable of changing the identification code. An identification code setting unit for setting an identification code is provided in the apparatus main body, and an access control unit for permitting access when the identification code transmitted by a radio signal from the apparatus main body matches a predetermined code is provided on a recording medium. The audio / video recording apparatus according to claim 2 or 3, wherein the audio / video recording apparatus is provided. 9. The audio / video recording apparatus according to claim 8, wherein the identification code setting section can change the identification code. 10. The recording medium includes a copy history storage unit for recording whether or not the record information is duplicated between the recording media, and the apparatus main unit confirms that the copy was made in the copy history storage unit of the copy source recording medium at the time of the copy. 4. The audio / video recording apparatus according to claim 2, further comprising a duplication control unit that writes the indicated duplication code and prohibits duplication using a recording medium on which the duplication code is written as a duplication source. 11. An access control for providing an identification code input unit for setting an identification code in an apparatus main body, and permitting access when an identification code input from the identification code input unit and transmitted by a wireless signal matches a predetermined code. 11. The audio / video recording apparatus according to claim 10, wherein the unit is provided on a recording medium, and when the access to the recording medium is permitted by a specific identification code, the duplicate code in the duplicate history storage unit can be erased. 12. The recording medium includes a copy history storage unit for recording whether or not the record information is duplicated between the record media, and the apparatus body is copied to the copy history storage unit of the copy destination at the time of the copy. 4. The audio / video recording apparatus according to claim 2, further comprising a duplication control unit that writes a duplication code indicating the duplication and prohibits duplication from a recording medium on which the duplication code is written as a duplication source. 13. The case is provided with an erroneous erasure preventing claw that can be cut off, and the apparatus main body is provided with a claw detecting unit for detecting the presence or absence of the erroneous erasure preventing claw, and when the claw detecting unit detects the removal of the erroneous erasure preventing claw. 4. The audio / video recording apparatus according to claim 2, further comprising: a read control unit that permits only reading of recorded information from a recording medium. 14. A recording medium, comprising: a receiving antenna for receiving a radio signal from the apparatus main body; a transmitting antenna for transmitting a radio signal to the apparatus main body; 3. An erroneous erasure prevention unit that disables transmission of a receiving antenna.
Or the sound / video recording device according to claim 3. 15. The audio / video recording apparatus according to claim 2, wherein the apparatus main body includes a compression unit that compresses when recording information is written to a recording medium. 16. The apparatus according to claim 2, wherein the apparatus main body includes an expansion section for expanding the recording information when the recording information is read from the recording medium, if the recording information is compressed.
The audio / video recording device according to the above. 17. The apparatus according to claim 2, wherein the apparatus main body includes a retransmission request unit for retransmitting the recording information to the recording medium when detecting a transmission error when reading the recording information from the recording medium. Sound / video recording device. 18. The apparatus main body includes a buffer memory for temporarily storing recording information read from a recording medium, adjusting the recording information read from the recording medium to an appropriate speed, and outputting the adjusted information. 18. The sound / video recording device according to item 17. 19. The apparatus main body has a plurality of recording media mountable thereon, and includes an access order control unit for recognizing a mounting position of each recording medium and accessing each recording medium in an order defined based on the mounting position. The audio / video recording device according to claim 2 or 3, wherein: