JP2906983B2 - Disk device capable of recording / reproducing received AV data - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a "disk apparatus capable of recording / reproducing received AV data", and only to normal recording / reproduction of audio data and / or video data (hereinafter referred to as "AV data"). And a disk device capable of recording / reproducing AV data transmitted from a partner station via a communication line.

[0002]

2. Description of the Related Art Audio CDs (Compa
ct Disc) has been around for about 10 years, and it has already spread beyond conventional cassette tapes,
At the same time, a CD variation disc, CD-
Discs such as ROM and CD-I (Interactive) capable of recording general data and image / character information have also been developed and are being used for various purposes. Recently, semiconductor laser technology and MPEG (Moving Picture Image Coding Exp
ert Group) to improve data compression technology.
DVD (Digital) capable of recording / reproducing V data
Video Discs) have been developed, and are expected to be used as AV media for reducing the size and digitalization of conventional LDs (Laser Discs) and improving the data transfer speed and increasing the capacity.

Conventionally, a dedicated disk reproducing apparatus corresponding to the specification of each disk has been used for reproducing a CD or its variation disks. However, with the development of DVD, a data compression method has been standardized, and AV software has been standardized. As a result, a service network that not only reproduces the AV data of a disc with a separate disc playback device but also provides a wide range of AV software via a communication line may be realized. is expected.

On the other hand, in the United States, a network for supplying AV software to each home by using a digital subscriber line has already been put into practical use, and a newly developed ADSL (communication interface) has been developed as a communication interface on a subscriber terminal side. Asymm
etric Digital Subscriber Line) adapter is used,
A method is employed in which AV data received by the adapter is reproduced by a television receiver. This ADSL adapter uses a wideband that is unused in a digital subscriber line to exchange digital signals.
It employs a voice system, and has a communication interface function of communicating at a transmission rate of 1.5 (M bits / sec) on the downlink from the office to the home and at a low transmission rate on the reverse uplink.

[0005]

However, at present, there is no disk device capable of receiving and recording / reproducing AV data such as CD and DVD. This is because, when the disk device receives AV data, it is necessary to execute a communication protocol prior to receiving the data, and for various reasons such as the transmission data format at the time of communication has not been determined, ADSL as described above
When a communication interface such as an adapter is developed and a data compression technique is standardized by the MPEG system, it becomes easy to directly record / reproduce AV data received using a disk device as a communication terminal. Accordingly, the present invention provides a disk device capable of recording / reproducing received AV data only by adding a communication function and a mode switching function to a conventional disk device for a disk such as a CD or a DVD. It was created for the purpose of realizing a network service of AV software using such as.

[0006]

According to a first aspect of the present invention, there is provided a mode selecting means for setting a disc reproducing mode and a receiving / reproducing mode in a disc apparatus dedicated to reproducing AV data or a disc apparatus capable of recording / reproducing, Communication means for executing a communication protocol with a partner station via a communication line in a reproduction mode setting state and receiving AV data having a common format with decoded data of a disc transmitted from the partner station; and reception of the communication means. Data buffer means for temporarily accumulating AV data, and data for reading out the received AV data from the data buffer means in accordance with the data processing speed of the reproduction signal processing unit in the reception / reproduction mode setting state and transferring the data to the switching means Transfer means, and a disc output from a decoder for reproduction when the disc reproduction mode is set. A disk device capable of reproducing received AV data, comprising: switching means for inputting decoded AV data read by said data transfer means to a reproduction signal processing unit when said decoded data is set in said reception / reproduction mode. According to.

According to a second aspect of the present invention, in a disk device capable of recording / reproducing AV data, mode selection means for setting a normal recording mode and a reception recording mode, and a communication line in a setting state of the reception recording mode via a communication line. Communication means for executing a communication protocol with a partner station and receiving AV data having a common format with decoded data of a disk transmitted from the partner station; and data buffer means for temporarily storing received AV data of the communication means And receiving AV data from the data buffer means in accordance with the data recording speed of the recording unit on the disc in the setting state of the reception recording mode.
Data transfer means for reading data and transferring the data to the switching means, and normal input AV data output from the recording signal processing unit in the normal recording mode setting state, and the data transfer means in the reception recording mode setting state The present invention relates to a disk device capable of recording received AV data, characterized by comprising a switching means for inputting the received AV data read out to a recording encoder.

[0008]

[Action]

The present invention is applied to a disk device exclusively for reproducing AV data or a disk device capable of recording / reproducing, and is selectively set to a disk reproduction mode and a reception reproduction mode by mode selection means. In the disk reproduction mode, the switching means connects the reproduction decoder and the reproduction signal processing unit, and the reading unit reads the AV data from the disk and reproduces the data in the normal operation.

On the other hand, in the reception and reproduction mode, the communication station accesses the partner station, executes a predetermined communication protocol, and receives transmission data from the partner station. In this case, the partner station transmits AV data, which is a common format with the decoded data of the disk on the disk device side, as transmission source data. The AV data received by the communication means is temporarily stored in the data buffer means.

In the receiving / reproducing mode, the switching means connects the data buffer means to the reproduction signal processing unit, and the data transfer means transmits received AV data from the data buffer means in accordance with the data processing speed of the reproduction signal processing unit. It is read and transferred to the reproduction signal processing unit via the switching means. Therefore, the reproduction signal processing unit can perform the reproduction processing of the received AV data in the same manner as the decoded data of the disk in the disk reproduction mode, and the output side circuit after the reproduction signal processing unit is shared between the disk reproduction mode and the reception reproduction mode. It is possible to reproduce AV data.

The second invention is applied to a disk device capable of recording / reproducing AV data, and is selectively set to a normal recording mode or a reception recording mode by mode selection means. In the normal recording mode, the switching means connects the recording signal processing unit and the recording encoder,
Based on the normal operation, AV data directly input to the apparatus is transferred from the recording signal processing unit to the recording unit via the recording encoder, and the encoded data is recorded on the disk.

On the other hand, in the receiving and recording mode, similarly to the first invention, the communication means executes the access of the partner station and the communication protocol to receive the decoded data of the disk and the transmission data of the common format from the partner station. The reception buffer means temporarily stores the received AV data. And
In the receiving and recording mode, the switching means connects the data buffer means and the recording encoder, and the data transfer means reads out the received AV data from the receiving buffer means in accordance with the data recording speed of the recording unit, and records via the switching means. To the encoder for Therefore, the recording unit can directly record the received AV data encoded by the recording encoder on the disc, and record the AV data while sharing the recording unit encoder and the recording unit in the normal recording mode and the reception recording mode. Becomes possible.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a "disk device capable of recording / reproducing received AV data" of the present invention will be described below in detail with reference to the drawings. First, FIG. 1 shows a system block circuit diagram of a disk device for recording / reproducing a phase change disk in a CD or DVD data format. In the figure, 1 is a phase change disk, 2 is a spindle motor, 3 is a read / write unit, 4 is a spindle servo unit, 5 is a focus / tracking servo unit for the read / write unit 3, 6 is a servo control circuit, and 7 is a servo control circuit. An RF amplifier for amplifying the read signal of the read unit 3, a reproduction decoder 8 for decoding the amplified read signal, a laser drive unit 9 for controlling the laser power at the time of recording / reproduction, and 10 for converting the AV data into a write signal. Recording encoder for encoding, 11 is for signal detection /
A signal processing unit that performs demodulation / error detection / correction of EFM (Eight to Fourteen Modulation) signals, MPEG encoding / decoding of DVD data, etc., 12 is an output analog system circuit for AV signals, and 13 is an input analog system for AV signals. A circuit, 14 is a CPU for controlling the signal processing unit 11, 15 is an operation unit, 16 is a display unit, and 17 is a CPU for controlling the entire system.

The disk device further has the following features. The ADSL adapter 21 (communication line 20) described in the prior art
The specification is changed depending on the type of the communication line), and has a communication function of communicating with the partner station via the communication line 20. A reception buffer 22 for temporarily storing AV data received by the ADSL adapter 21 is provided. The data input circuit to the signal processing unit 11 is connected to the reproduction decoder 8
A switch circuit 23 for switching between the ADSL adapter 21 side and the ADSL adapter 21 side is provided. A switch circuit 24 for switching a data input circuit to the recording encoder 10 between the signal processing unit 11 and the reception buffer 22 is provided. A normal disk recording / reproduction mode and a reception recording / reproduction mode can be selectively set from the operation unit 15, and the CPU 17 switches the system mode according to each selected mode and has a program for executing a control procedure in each mode. The display section 16 is provided with an alarm buzzer 16a.
Note that the communication line 20 is a high-speed digital line, and the B-ISD
N (Integrated Service Digital Network) or the like is used.

The operation procedure of the disk device in each mode will be described below with reference to the flowcharts of FIGS. FIG. 3 shows an operation procedure in a normal disc reproduction mode. First, when the disc reproduction mode is selected and set by the operation unit 15, the CPU 17 sets the connection state of the switch circuit 23 to the reproduction decoder 8 side (a side). Next, when there is a reproduction instruction input from the operation unit 15 with the disk 1 set, the servo control circuit 6 controls the spindle servo unit 4 and the focus / tracking servo unit 5, and follows the normal operation at the start of disk reproduction. The reading unit 3 is moved to the lead-in area of the disk 1, and the TOC (Table of Contents) information of the disk 1 is read (S1, S2).
2).

The TOC information includes table-of-contents information such as the number and time information of the program (music and video) recorded on the disc 1. The Q channel is the same as the sub-coding of the data area as shown in FIG. Data bits representing the information have a frame structure as shown in
Control bit (4 bits) preceding (72 bits)
And address bits (4 bits) are added. The control bits Q1 to Q4 indicate that the disk is an audio disk when Q2 is "0", and indicate a data disk when it is "1". In this embodiment, it is the phase change disk 1. Therefore, in the former case, it is recorded in the CD format, and in the latter case, it is recorded in the DVD format. Then, the read TO
The C information is fetched from the decoder 8 to the CPU 17 via the CPU 14, and the CPU 17 determines the type of the disk 1 from the contents of the control bits Q1 to Q4.

As a result of the above determination, if the disc 1 is recorded in the CD format, the CPU 17
Immediately sets the CD flag, and sets the signal processing unit 11 to the CD reproduction processing mode by the CPU 14 (S3 → S4, S5). Then, after confirming the input instruction data and displaying the music number or the like corresponding to the instruction data on the display unit 16, the servo control is executed, and the reading unit 3 is moved to the recording position of the instruction music data to be sequentially read. Playing back the music data (S6-S
Ten). At this time, the reproduced signal is [Reading part 3 → RF amplifier 7 →
It is output as a D / A-converted audio signal through the reproduction decoder 8 → the switch circuit 23 → the signal processing unit 11 → the output analog circuit 12). Thereafter, each time the reproduction of the music data for one movement is completed, the input instruction data is confirmed, and the steps S6 to S10 are executed to decode and reproduce all the specified music data. (S11 → S6
~ S10).

On the other hand, the control bit Q of the TOC information
If Q2 is "1" as a result of the judgment of 1 to Q4, the DV
Instead of determining that the disc is recorded in the D format, the CPU 17 moves the reading unit 3 from the lead-in area to the data area, and checks whether or not the disc 1 is of the DVD format based on the read subheader. (S3 → S12, S13). Further, in this case, even if the subheader indicates the DVD format, the determination is not determined, the first track (only the control code and the like are recorded in the DVD) is read, and the It is confirmed whether the data is data (S14, S15). Then, the confirmation result is notified from the CPU 14 to the CPU 17.
17 sets a DVD flag at that stage and sets the signal processing unit 9 to the DVD reproduction processing mode by the CPU 14.
(S16 → S17, S18).

As a result, the reproduction signal of the DVD format of the disc 1 passes through the [reading unit 3 → RF amplifier 7 → reproduction decoder 8 → switch circuit 23 → signal processing unit 11 → output analog system circuit 12] for audio / video. Output as a signal. still. In this case, since it is a DVD format,
The signal processing section 11 expands the MPEG data and outputs it to the output analog circuit 12. The reproduction procedure for each chapter from the disc 1 is the same as that in the case of the CD format. The CPU 17 displays each chapter while displaying the video and music contents of the reproduction chapter instructed and input from the operation unit 15. Regenerate (S19-S24). On the other hand, if the data is not in the DVD format in step S13 (for example, if the data is a CD-ROM) or if the data is not MPEG data in step S16, the CPU 17 that has received the notification cannot reproduce the data on the display unit 16. A message to the effect is displayed (S13, S16 → S25).

FIG. 4 shows an operation procedure in the reception / reproduction mode. First, when the reception / reproduction mode is selected and set from the operation unit 15, the CPU 17 switches the connection state of the switch circuit 23 to the reception buffer 22 side (b side). Next, in this mode, a partner station such as an AV software service center is called via the communication line 20. Specifically, when the telephone number of the partner station is input from the operation unit 15 and a calling instruction is given, the CPU 17
A call is made to the partner station via the adapter 21 and a call setting is made by the partner station responding (S31). Note that the call setting and the communication relating to the next communication protocol are performed at a low transmission rate using the control channel of the communication line 20.

When the call is set, the CPU 17 causes the ADSL adapter 21 to execute a communication protocol which has been previously determined with the partner station, and when a data link is established by communication using a proper transmission control code. , AD
The SL adapter 21 is ready set to the high-speed transmission data reception mode (S32 to S34). On the other hand, the partner station has completed preparations for data transfer when the data link has been established.
The PU 17 causes the ADSL adapter 21 to transmit a data transfer request code and shifts to the start of data reception (S35, S3).
6). In such a service network, the content of the video or music to be serviced in a pamphlet or the like is often notified to the recipient side with a code number. In such a case, the operation unit 15 requests the content. It is also possible to input a code number of a video or music and notify the code number to the service center at the stage of executing the communication protocol to select a video or music to receive a service.

By the way, the other station transmits the decoded data of the CD or DVD held by the same station through a high-speed data channel in the downstream direction (service center or the like → disk device). That is, when the partner station is a service center or the like, CD and DVD decoded data are stored in the library, and the ADSL installed in the station is
Communication line 20 after link establishment by compatible transmission system
Send to Therefore, the disk device can receive the decoded data of the CD or DVD as it is, and can perform the same processing as the decoded data in the disk reproduction mode.

In the disk device, the switch circuit 23 connects the reception buffer 22 and the signal processing unit 11 based on the setting of the reception and reproduction mode as described above. Become. However, communication line
While the data transmission speed of 20 is constant, the signal processing unit
Since the data processing speed of the data processing unit 11 fluctuates, the CPU 17 controls the data read / transfer speed from the reception buffer 22 in accordance with the data processing speed of the signal processing unit 11.

After the start of the data reception, the partner station sets the AV
A procedure for transmitting TOC data prior to data transmission, and a procedure for discriminating whether the transmission data is a CD format or a DVD format based on the TOC data on the disk device side, and a procedure for setting a CD reproduction processing mode in the case of the CD format The procedure for setting whether or not the transmission data corresponding to the first track is MPEG data and setting the DVD playback processing mode, and the procedure for playing back music and the like, are as follows.
The only difference is whether the data to be played back is the data of the disc 1 or the received data, and is executed in the same manner as in the disc playback mode (S38 to S57). Therefore, in the disk device, the signal processing unit 11 and the output analog system circuit 12 can be shared in the disk reproduction mode and the reception reproduction mode, and the AV data received from the partner station can be reproduced in the reception reproduction mode. In this reception / reproduction mode, D
When the data is not in the VD format (S46) or when the data is not MPEG data (S48), the CPU 17 displays on the display unit 16 that reproduction is impossible, and the partner station continues data transmission as it is. The ADSL adapter 21 sends a data transmission stop request through the control channel of the communication line 20, and after confirming the request, disconnects the current connection line (S46, S48 → S55-S57).

Next, the operation of the disk device in the recording mode will be described. When the normal recording mode is set from the operation unit 15 in this disk device, the CPU 17 switches the switch circuit 24 to the recording encoder 10.
And the signal processing unit 11 in the connection state (c side).
The data is processed by the signal processing unit 11 through the input analog system circuit 13, and the servo control circuit 6 performs the focus / tracking servo of the recording unit 3 while the recording encoder 1
0 is the encoded recording signal and the laser driver 9 is the recording unit 3
Is recorded on the disk 1 by controlling the laser power. In this case, the signal processing unit 11 sets a processing mode corresponding to the case where the input data is in the CD format and the case where the input data is in the DVD format. The details will be described in the next reception recording mode.

The feature of this disk device is that AV data transmitted from the partner station is recorded on the disk 1 in the reception and recording mode. The operation procedure in the reception and reproduction mode is shown in the flowchart of FIG. First, the operation unit
When the reception recording mode is selected and set from 15, the CPU 17 changes the connection state of the switch circuit 24 to the reception buffer 22 side (d side).
The connection state of the switch circuit 23 is also changed to the reception buffer 22 side (b
Side). When this mode is set, the CPU 17 sets a preliminary reproduction mode, activates the disk 1 set in advance by the servo control circuit 6, and uses the U-TOC (User's Table O
f Contents) Read the data and send the data
(S61).

Next, as in the case of the above-mentioned reception and reproduction mode, a data link is established by setting up a call with the partner station and executing a communication protocol, and the ADSL adapter 21 is set to the reception ready state to make a data transfer request (S62). ). Also, a procedure for discriminating between the CD format and the DVD format based on the TOC data after the start of the data reception, a procedure for setting the CD reproduction processing mode in the case of the CD format, and whether or not the transmission data corresponding to the first track is MPEG data The procedure for setting the DVD playback processing mode after confirming the above is executed in the same manner as in the reception playback mode (S63-
S65, S72-S75). If the data is not in the DVD format (S73) or if the data is not MPEG data (S75), a recording disabled display is displayed on the display unit 16 and a data transmission stop request is made to the partner station to make the current line. (S85 ~ S8
7).

In the receiving and recording mode,
Since it is necessary to confirm whether the free recording capacity of 1 is enough to record all the data transmitted from the partner station, the disc 1 is stored on the basis of the previously saved U-TOC data. The free recording capacity is obtained as a value converted into time, and the reproduction time of all data transmitted based on the received TOC data is obtained, and by comparing them, it is determined whether the free recording capacity of the disc 1 is sufficient. A determination is made (S66, S76).

If the result of the above determination is that the free recording capacity of the disk 1 is sufficient, the processing shifts to recording of received data on the disk 1. First, when the discrimination result based on the TOC data is in the CD format, the reception CD flag is turned ON, and the reception CD data in the reception buffer 22 is read out and transferred to the recording encoder 10 via the switch circuit 24. Then, the laser drive unit 9 applies the recording unit 3 to the disk 1 that has been previously driven and controlled by the servo control circuit 6.
Record received CD data while controlling laser power
(S67, S69-S71). Note that, even in this recording state, since the data receiving speed and the recording speed on the disc 1 are different, the CPU 1
Reference numeral 7 controls the data read / transfer speed from the reception buffer 22 in accordance with the data recording speed.

The CPU 17 sets the signal processing unit 11 to the CD reproduction processing mode based on the reception CD flag being turned on,
The received CD data read from the receiving buffer 22 is transferred to the signal processing unit 11 via the switch circuit 23 connected to the b side, and the processed data is output via the analog circuit 12 for audio output for monitoring. (S68, S70).

On the other hand, when it is determined that the received data is in the DVD format (S65 to S75), the receiving DVD flag is turned on, the received DVD data in the receiving buffer 22 is read, and transferred to the recording encoder 10. The MPEG data is recorded on the disc 1 in the same operation procedure as in the case of the CD format (S77 to S81). Also,
The signal processing unit 11 is set to the DVD reproduction processing mode for outputting the monitor audio / video data (S7).
8).

By the way, the case where the disc 1 has a free recording capacity capable of recording all the received data has been described (S66 → S67, S76 → S77), but if the free recording capacity is insufficient, the CPU 17 Immediately sound the alarm buzzer 16a provided on the display unit 16 to notify the operator of that (S66, S76 → S82). Also, since the partner station continues data transmission as it is, a data transmission stop request is sent to the partner station as in the case of the reception / reproduction mode, and the current connection line is disconnected (S83, S84).

In this embodiment, the disk drive systems 2, 4, 5, 6
And the signal read / write systems 3, 7, and 9 have a single configuration.
If each unit can be independently set in mode by the PU 17, the disc reproduction mode and the reception / recording mode can be set simultaneously, and the reception AV data is recorded on the other disc while reproducing the AV data of one disc. This makes it possible to prevent erroneous overwriting of received AV data on a disk that should not be erased.

Further, there are grades such as MPEG1 and MPEG2 in the data compression / expansion of the MPEG system. However, it is also possible to identify those grades and execute processing corresponding to the identified grade in the signal processing unit 11. is there. In that case, S13 in FIG. 3 described above,
At step S46 in FIG. 4 and step S73 in FIG. 5, the grade is identified, and the signal processing unit 11 is set to a processing mode corresponding to the grade. In addition, although there are a plurality of levels and profiles in MPEG2, the above-described identification can be extended to those contents, and processing corresponding to the identified level can be performed.

[0035]

The "disk device capable of recording / reproducing received AV data" of the present invention has the following effects by having the above configuration. According to the first and second aspects of the present invention, in a disk device, AV data transmitted from a partner station via a communication line is received, and built-in hardware is used in a normal recording / reproduction mode and a reception recording / reproduction mode. It is possible to record / reproduce received AV data while sharing, realize a network construction that efficiently uses hardware resources and allows a user to enjoy a wide range of AV software with simple operations. According to a third aspect of the present invention, in the reception recording mode, it is confirmed in advance whether or not all available AV data can be recorded in the free recording capacity of the disc, and a notification is made when the free recording capacity of the disc is insufficient. It is possible to automatically execute a response such as a request to stop transmission of AV data to a partner station.

[Brief description of the drawings]

FIG. 1 shows a disk device according to an embodiment of a “disk device capable of recording / reproducing received AV data” (a disk device which performs recording / reproduction in a CD or DVD data format for a phase change disk) 3) is a system block circuit diagram.

FIG. 2 is a diagram illustrating a frame structure of a Q channel of TOC information.

FIG. 3 is a flowchart showing an operation procedure in a disk reproduction mode.

FIG. 4 is a flowchart showing an operation procedure in a reception / reproduction mode.

FIG. 5 is a flowchart illustrating an operation procedure in a reception recording mode.

[Explanation of symbols]

1… Phase change disk (disk), 2… Spindle motor,
3 read / write unit, 4 spindle servo unit, 5 focus / tracking servo unit, 6 servo control circuit,
7 RF amplifier, 8 reproduction decoder, 9 laser driving unit, 10 recording encoder, 11 signal processing unit (reproduction signal processing unit, recording signal processing unit), 12 output analog system circuit, 13
... Input analog circuits, 14, 17 CPU (14, 17; mode selection means, 17; communication means, data transfer means, switching means), 15
... Operation part (mode selection means), 16 ... Display part, 16a ... Buzzer for alarm, 20 ... Communication line, 21 ... ADSL adapter (communication means), 22 ... Reception buffer (data buffer means), 23,
24 ... Switch circuit (switching means).

Continuation of front page (56) References JP-A-5-207411 (JP, A) JP-A-4-195858 (JP, A) JP-A-4-34052 (JP, U) (58) Fields surveyed (Int .Cl. ⁶ , DB name) G11B 20/10

Claims (3)

(57) [Claims] 1. A mode selection means for setting a disk reproduction mode and a reception / reproduction mode in a disk apparatus dedicated to reproduction of audio data and / or video data (AV data) or a disk apparatus capable of recording / reproduction, said reception / reproduction An AV having a common format with the decoded data of the disc transmitted from the partner station while executing the communication protocol with the partner station via the communication line in the mode setting state
Communication means for receiving data, and reception AV of the communication means
Data buffer means for temporarily storing data, and data transfer for reading received AV data from the data buffer means in accordance with the data processing speed of the reproduction signal processing unit in the setting of the reception / reproduction mode and transferring the data to the switching means described later. Means for inputting, to the reproduction signal processing unit, the decoded data of the disk output from the reproduction decoder in the disk reproduction mode setting state, and the reception AV data read by the data transfer means in the reception reproduction mode setting state. A disk device capable of reproducing received AV data, comprising a switching means. 2. A disk device capable of recording / reproducing audio data and / or video data (AV data), a mode selection means for setting a normal recording mode and a reception recording mode, and Communication means for executing a communication protocol with a partner station via a communication line and receiving AV data having a common format with decoded data of a disc transmitted from the partner station;
Data buffer means for temporarily storing the received AV data of the communication means, and read-out of the received AV data from the data buffer means in accordance with the data recording speed of the recording unit on the disk in the setting state of the reception recording mode, and switching to be described later. Data transfer means for transferring the received input AV data output from the recording signal processing unit in the normal recording mode setting state, and the received AV data read by the data transfer means in the reception recording mode setting state. Characterized by comprising a switching means for inputting the data to a recording encoder. 3. A first detecting means for detecting a free recording capacity of a disk by driving a disk which has been set in advance when a reception recording mode is set, and TOC information transmitted from a partner station prior to transmission of AV data. Detecting means for detecting the data amount of the AV data transmitted based on the data, and notifying the fact when the data amount detected by the second detecting means is larger than the free recording capacity detected by the first detecting means. 3. A disk device capable of recording received AV data according to claim 2, further comprising a notifying means for performing the recording.