JP2000004274A - Electronic equipment and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform two-way communication with a personal computer, etc., by using a remote control terminal by first performing negotiation to discriminate the category of a slave device and deciding a communication method based on it in the communication between a master device and the slave device. SOLUTION: A terminal 2 is a terminal which is for performing two-way communication between a recording and reproducing device 1 and the outside and communication is performed with a prescribed protocol between an external device connected as a slave device and a system controller 11 in the device 1 as a master device. In such a case, the category of the slave device is automatically discriminated by mutually performing authentication and communication is performed in an optimum method. For instance, when remote control corresponding to the device 1 is connected to a remote control connecting part 23, it is discriminated that the remote control is connected to the controller 11 and display data to a displaying part of the remote control is sent from the controller 11 to the remote control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device and a communication method suitable for use in, for example, a portable audio device and adapted to determine the type of connected device.

[0002]

2. Description of the Related Art Conventionally, audio equipment intended for portable use has been widely used. In such an audio device, an MD (Mini Disc), a cassette tape, or the like is used as a recording medium, and sound is reproduced by small headphones. The housing is made as small as possible for convenient carrying.

[0003] Operation of portable audio equipment can be performed by a wired remote control commander (hereinafter abbreviated as "remote controller"). That is, by operating a key provided on the remote controller, a key signal corresponding to the operation is transmitted to the device. The state of the device such as playback or stop is controlled by the key signal.

[0004] In addition, the remote control is often provided with a display unit for performing display in accordance with the state transition of the connected portable audio equipment. This display unit is, for example, an LCD (L
The display indicates “play” or “stop” based on the key signal described above. In order to realize such a function, in addition to the above-described transmission of the key signal, communication is performed from the portable audio device to the remote controller according to a predetermined protocol, and display data accompanying the state transition of the device is transmitted. Is done.

[0005]

In recent years, connecting audio equipment to information equipment such as a personal computer has been put into practical use. Thus, for example, it is possible to connect a MD device using an MD as a recording medium and a personal computer via a predetermined interface, and easily perform title editing of music data recorded on the MD. In order to realize such an interface in a portable audio device, it is necessary to reduce the size of the housing as much as possible. Therefore, it is conceivable to use a terminal for connecting a remote controller as the interface.

[0006] As described above, the communication performed between the remote controller and the portable audio device is intended to transfer display data accompanying the state transition of the device to the display unit of the remote controller. Therefore, conventionally, there was a problem that the communication protocol using the remote control terminal did not support bidirectional data communication as performed between a personal computer and a portable audio device.

On the other hand, in communication performed between a personal computer and a portable audio device, it is considered that transfer of display data from the portable audio device is unnecessary. Therefore, even if the above-mentioned problem is solved and the protocol is extended for two-way communication, the above-described conventional specification of transferring the display data in accordance with the state transition of the portable audio device may cause the mobile phone to fail. This unnecessary display data is transferred from the audio equipment for personal use to the personal computer, and there is a problem in that the communication load becomes heavy.

Accordingly, it is an object of the present invention to provide an electronic device and a communication method for performing bidirectional communication with an information device such as a personal computer using a remote control terminal.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an electronic apparatus to which a slave device as an external device is connected. Communication means for performing communication with the slave device by means of communication with the slave device, and performing authentication by the communication means to mutually authenticate with the slave device, and permitting the start of data communication with the slave device when the authentication is confirmed. And electronic means.

According to another aspect of the present invention, there is provided a communication method performed between a master device and a slave device connected as an external device to the master device. When the slave device is connected to the master device in the connection step, the master device and the slave device communicate with each other to perform authentication, and when the authentication in the authentication step is confirmed, the master device Permitting the start of data communication between the communication device and a slave device.

As described above, in the present invention, communication is performed between the slave device and the master device connected by the connection means, and the master device and the slave device mutually authenticate by this communication. Since the start of data communication is permitted when the authentication is confirmed, the master device can perform data communication by a communication method suitable for the slave device.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an example of the configuration of a communication system according to this embodiment. In this example, the recording / reproducing apparatus 1 uses M as a recording medium.
This is a portable audio device that records and reproduces audio signals using D (Mini Disc). The recording / reproducing apparatus 1 includes a cable 102 and an interface converter 101
And the personal computer 100 via the cable 103.

The recording / reproducing apparatus 1 communicates with a remote controller (not shown) via a remote controller connecting section 23. Communication is performed between the remote controller and the recording / reproducing apparatus 1, and a signal for controlling the operation of the recording / reproducing apparatus 1,
Signals and the like for performing display according to a change in the state of the recording / reproducing apparatus 1 are exchanged with the display unit of the remote controller.

The recording / reproducing apparatus 1 and the interface converter 101 are connected by a cable 102 connected to the remote controller connecting section 23. The interface converter 101 has, for example, a CPU therein, and has a protocol used for communication on the recording / reproducing apparatus 1 side and a protocol used on the personal computer 100 side (for example, R
S-232C), and the communication between the personal computer 100 and the recording / reproducing device 1 is enabled.

FIG. 2 shows an example of the configuration of the recording / reproducing apparatus 1. Magneto-optical disk (MD) 9 on which audio data is recorded
0 is rotationally driven by the spindle motor 2. Then, when recording / reproducing with respect to the magneto-optical disk 90,
Laser light is emitted by the optical head 3.

At the time of recording, the optical head 3 outputs a high level laser output for heating the recording track to the Curie temperature. At the time of reproduction, a relatively low-level laser output for detecting data from reflected light by the magnetic Kerr effect is performed. Therefore, the optical head 3 is equipped with a laser diode as a laser output unit, an optical system including a polarization beam splitter and an objective lens, and a detector for detecting reflected light. Objective lens 3
“a” is held by a biaxial mechanism so as to be displaceable in a disk radial direction and in a direction of coming and coming from the disk.

The magnetic head 6a is arranged at a position facing the optical head 3 with the disk 90 interposed therebetween. The magnetic head 6a performs an operation of applying a magnetic field modulated by the supplied data to the magneto-optical disk 90. Optical head 3
The whole and the magnetic head 6a can be moved in the disk radial direction by the sled mechanism 5.

The information detected from the disk 90 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The arithmetic processing of the information supplied by the RF amplifier 7 is performed, and the reproduced RF signal and the tracking error signal T
E, focus error signal FE and groove information GF
M and the like are extracted. The groove information GFM is
This is absolute position information recorded on the magneto-optical disk 90 as a pre-groove (wobbling groove). The extracted reproduction RF signal is supplied to the encoder / decoder unit 8. The tracking error information TE and the focus error signal FE are supplied to the servo circuit 9. The groove information GFM is supplied to the address decoder 10.

The servo circuit 9 responds to the supplied tracking error signal TE and focus error signal FE, a track jump command and an access command from a system controller 11 composed of a microcomputer, rotation speed detection information of the spindle motor 2, and the like. And generate various servo drive signals. As a result, 2:00 Kukimitsu 4
And the sled mechanism 5 are controlled, focus and tracking control is performed, and the spindle motor 2 is controlled.
Is controlled to a constant linear velocity (CLV).

The address decoder 10 decodes the supplied groove information GFM to extract address information. This address information is supplied to the system controller 11 and used for various control operations. Also, the playback R
The F signal is subjected to decoding processing such as EFM modulation and CIRC in the encoder / decoder section 8. At this time, addresses, subcode data, and the like are extracted from the reproduced RF signal and supplied to the system controller 11.

The encoder / decoder section 8 performs EFM modulation,
The audio data (sector data) subjected to the decoding processing such as CIRC is temporarily written to the buffer memory 13 by the memory controller 12. The reading of data from the disk 90 by the optical head 3 and the transfer of reproduced data in the system from the optical head 3 to the buffer memory 13 are performed at 1.41 MHbit / sec. Further, data transfer is usually performed intermittently.

The data written in the buffer memory 13 is read out at a timing at which the transfer of the reproduced data becomes 0.3 Mbit / sec.
Supplied to Then, the digital audio signal is subjected to reproduction signal processing such as decoding processing for audio compression processing, and has a sampling frequency of 44.1 KHz and a quantization bit number of 16 bits.

This digital audio signal has a D / A
The signal is converted into an analog signal by the converter 15 and the output processing unit 1
In 6, level adjustment, impedance adjustment, etc. are performed.
Analog audio signal Aou from line output terminal 17
Output to the external device as t. The analog audio signal output from the output processing unit 16 is also supplied to the headphone amplifier 18. Headphone amplifier 1
The output of 8 is supplied to a headphone jack 22.
The headphone jack 22 is provided in the recording / reproducing apparatus 1 so as to form a part of the remote control connecting section 23 described above.

When an audio signal based on an analog signal is input to the magneto-optical disk 90 and recording is performed, the recording signal (analog audio signal Ain) supplied to the line input terminal 20 is subjected to A / D conversion. After being converted into digital data by the device 19, the digital data is supplied to the encoder / decoder section 14 and subjected to audio compression encoding processing. In addition,
Although not shown, a microphone input terminal may be provided to use the microphone input as a recording signal. Further, it is possible to adopt a configuration in which a digital audio signal can be directly input.

The recording data compressed by the encoder / decoder 14 is temporarily written and accumulated in the buffer memory 13 by the memory controller 12,
The data is read out for each predetermined amount of data unit and sent to the encoder / decoder unit 8. Then, the encoder / decoder unit 8 performs encoding processing such as CIRC encoding and EFM modulation, and then supplies the encoded data to the magnetic head driving circuit 6.

The magnetic head drive circuit 6 supplies a magnetic head drive signal to the magnetic head 6a in accordance with the encoded recording data. That is, the application of the N or S magnetic field to the magneto-optical disk 90 by the magnetic head 6a is performed. At this time, the system controller 1
1 supplies a control signal to the optical head 3 so as to output a recording level laser beam.

The remote controller connecting section 23 has four terminals T1 to T1.
It has T4. By connecting a corresponding remote controller to the connection unit 23, it is possible to control the operation of the recording / reproducing apparatus 1 by the remote controller and to perform display associated with the state transition of the recording / reproducing apparatus 1 on the display unit of the remote controller. Remote control connection 2
When a corresponding remote controller is connected to terminal 3, terminal T1
Is connected to the earth line of the remote controller and supplies power to the remote controller via the terminal T4. Also,
Control signals based on various key operations on the remote controller are supplied to the system controller 11 via the terminal T3.

Further, a terminal T2 is a terminal for performing bidirectional communication between the recording / reproducing apparatus 1 and the outside. Although details will be described later, communication is performed by a predetermined protocol between an external device connected as a slave device and the system controller 11 of the recording / reproducing device 1 as a master device. By performing mutual authentication, the type of the slave device is automatically determined, and communication is performed by an optimal method. For example, when a remote controller corresponding to the recording / reproducing device 1 is connected to the remote controller connection unit 23, it is determined that the remote controller is connected to the system controller 11, and the display data on the display unit of the remote controller is transmitted to the system controller 11. Sent to the remote controller.

The operation section 29 is provided with various operation keys for the user to instruct recording / reproduction / editing operations. As an example, the operation unit 29 includes a play key, a record key, a stop key, an AMS / search key, a pause key,
An edit mode key, an edit operation key, and a display mode key are provided. The operation unit 29 is provided with controls for inputting a disc title, a track name, and other information. As the editing operation, track name input, disc name input, track division, track concatenation, track movement (change of track number as reproduction order), track deletion, and the like can be performed. The operation unit 29 is provided with operators required for performing these operations.

Operation information from the operation keys of the operation section 29 and the like and operation information from the remote controller input via the terminal T3 are supplied to the system controller 11. The system controller 11 performs operation control based on the supplied operation information.

The display unit 30 is, for example, an LCD (Liquid Crys).
tal Display) and a display driver (not shown) for driving the LCD, and are provided on the housing of the recording / reproducing apparatus 1. The display on the display unit 30 is controlled based on the display control signal supplied from the system controller 11. That is, at the time of display on the display unit 30, display data is sent from the system controller 11 to a display driver (not shown). The LCD is driven by the display driver, and required numbers, characters, symbols, and the like are displayed on the display unit 30.

It should be noted that the system controller 11
The microcomputer is provided with a U, a ROM storing programs and a predetermined data table, a RAM used as a work memory, an interface, and the like. The system controller 11 controls the various operations described above.

By the way, when performing the recording / reproducing operation on the disk 90, the management information recorded on the disk 90, that is, the P-TOC (premastered TO
C: Table Of Contents) and U-TOC (user T)
OC) must be read. System controller 1
1 determines the address of the area to be recorded on the disk 90 and the address of the area to be reproduced according to the read management information. These pieces of management information are stored in the buffer memory 13.

These pieces of management information are read out to the system controller 11 by executing a reproduction operation on the innermost side of the disc on which the management information is recorded when the disc 90 is loaded. The read management information is stored in the buffer memory 13 so that it can be referred to when recording / reproducing / editing the disc 90 thereafter.

The U-TOC is rewritten according to data recording and various editing operations. System controller 11
Thus, each time a recording / editing operation is performed, the buffer memory 13
The above U-TOC data is updated. Further, at a predetermined timing according to the rewriting operation, the U-
The area of TOC is rewritten.

FIG. 3 is an external view of an example of the plug 110 used in correspondence with the above-mentioned remote controller connection section 23 and headphone jack 22. Front view (FIG. 3A), side view (FIG. 3B), and plan view (FIG. 3C) of plug 110
Show it each. The plug 110 has a structure in which a stereo compatible headphone plug 112 and a connector unit 113 are integrally attached to a plug body 111 as shown in the figure.

The headphone plug 112 corresponds to the headphone terminal 22 of the recording / reproducing apparatus 1. Also,
As shown in FIG. 3A, assuming that the left surface of connector portion 113 is the A surface and the right surface thereof is the B surface when viewed from the front, connector portion 113 has a B surface as shown in FIGS. 3A and 3B. Electrode terminals 121, 122, 12 only on the surface side
3 and 124 are provided. Electrode terminals 121 and 12
2, 123 and 124 correspond to, for example, the terminals T1, T2, T3 and T4 in the remote controller connection unit 23, respectively.

Electrode terminals 121, 122, 123 and 1
The wiring line drawn from the cable 24 passes through the inside of the cable 102 and is connected to, for example, a circuit unit of a remote controller (not shown). In the connection example as shown in FIG. 1, the electrode terminals 121, 122, 123 and 1
24 and the interface converter 101 are connected to the cable 10
2 are connected. When the connection as shown in FIG. 1 is performed, the headphone plug 112 can be omitted.

Next, the communication performed via the terminal T2 will be described. This communication is performed by the recording / reproduction device 1
As a master device, and an external device connected by a terminal T2 as a slave device. This communication is performed between the system controller 11 and the external device via the terminal T2.
This is performed by transmitting data in packet units via the. At the start of the communication, the master device and the slave device perform negotiation, which will be described later, so that mutual authentication is performed, and the type of the slave device is determined. Based on this determination result, the system controller 11 can set communication conditions corresponding to the slave device.

As shown in FIG. 4, one bit is composed of a data period Wd and a clock period Wc, and is expressed by combining a high level and a low level of a signal. The data period Wd is determined based on the length of the clock period Wc. In this example, data '0' is
A and data '1' is represented as shown in FIG. 4B. Further, the lengths of these periods are changed depending on the contents of negotiations described later.

FIG. 5 shows a configuration example of 1-byte data. Eight bits from D0 to D7 are arranged from the LSB to the MSB. Note that the period of the first one bit is
This is for starting the shift register on the receiving side. Ignored by software. If the receiving side can handle this, the one-bit period can be omitted.

FIG. 6 shows an example of a data packet structure. A synchronization signal SYNC is arranged at the beginning to indicate the start of a packet. The subsequent 1-byte data Req is data for notifying the slave side of a transmission request or a reception status of the previous packet. The next data Dir is data indicating the direction of the following data with reference to the transmission request of the slave device. Next to the data Dir, data B0 to B9 of 10 bytes, which is the body of the packet, are arranged. The data B0 to B9 include predetermined editing commands and operation commands for the recording / reproducing apparatus 1, display data for a remote controller, and discs such as disc names and track names read from the U-TOC of the disc 90 by the recording / reproducing apparatus 1. Information is stored. One byte of data CS is a checksum for data B0 to B9.

FIG. 7 is a flowchart of an example of a communication procedure performed between a master device (recording / reproducing device 1) and a slave device connected as an external device using such a packet structure. In brief,
In step S10, the master device and the slave device are connected, and in steps S11 to S14, the above-described negotiation processing is performed. In the master device, the device type of the slave device is determined, and the communication method corresponding to the slave device is determined. Is done. Then, in step S15, a display based on the device type of the slave device is made on the master device side.

In performing such processing, a value representing a device type corresponding to each type is given to the master device and the slave device in advance. The device type value is stored in advance in, for example, a ROM in each of the master and slave devices. Alternatively, the value of the device type may be generated by a predetermined software process. The device type value is
In the above-described packet configuration, the data is stored in the data B0 to B9 and transmitted. On the other hand, on the master device side, the device type of the slave device is stored as a table in, for example, the ROM.

FIG. 8 shows an example of the value of the device type. FIG. 8A is an example of a device type value given to a slave device. Examples of the slave device include a remote controller for operating the recording / reproducing device 1, a personal computer, a labeler for creating a label based on the TOC information read from the disk 90, an electronic still camera,
A MIDI sound source or the like which is a sound source device corresponding to MIDI (Musical Instrument Digital Interface) is defined.

In this example, for the slave device, 4
Bits give the value of the device type. The value of each device type is '0' for the personal computer.
000, labeler is '0001', electronic still camera is '0010', and MIDI sound source is '0011'. If no value is given to the remote controller and the value of the device type does not return, it is determined that the slave device is a remote controller.

FIG. 8B is an example of the device type value given to the master device. As the master device, for example,
An audio playback device, an audio recording / playback device, an MD data device adapted to record data on the MD, and the like are defined. In addition, regarding the device for MD data, 2 according to the format of MD data.
The type is defined.

In this example, a device type value is given to the master device in three bits. The value of each device type is "00" for the audio playback device.
0, audio recording / reproducing device is '001', MD
The device for the first format of data is '010', M
The device for the second format of the D data is '011'.

The flowchart of FIG. 7 will be described in more detail. In the first step S10, a slave device is connected to the master device. For example, in the recording / reproducing apparatus 1 which is a master apparatus, a plug 110 is attached to the remote controller connection unit 23, and the personal computer 100 and the recording / reproducing apparatus 1 are connected via the cable 102, the interface converter 101, and the cable 103. Connected.

The negotiation process is started from step S11. Note that a synchronization signal is always output from the master device, and when the devices are connected to each other in step S10, the negotiation process can be automatically started.

In step S11, a SLAVE TYPE REQUEST command is issued from the recording / reproducing device 1 as the master device to the external device as the slave device, and a device type of the slave device is requested. The external device receiving this command sets the recording / reproducing device 1 based on the device type value given in advance.
, A SLAVE TYPE DATA command is issued, and the device type of the external device is notified to the recording / reproducing apparatus 1 (step S12).

SLAVE T sent from an external device
The YPE DATA is received by the recording / reproducing device 1 and stored in, for example, a RAM included in the system controller 11. As described above, the recording / reproducing apparatus 1 which is the master apparatus includes, for example, the RO included in the system controller 11.
M has a slave type table in advance. In the recording / reproducing apparatus 1, the SLAV received from the external device
E TYPE DATA is compared with the slave type table to determine the type of the connected external device. Then, a communication method with the connected external device is determined based on the determination result (step S13).

For example, SLAVE TYPE DATA
Is "0000", the connected external device is determined to be a personal computer, and the setting is made so that display data is not transmitted to the external device. At the same time, it is set to use a command capable of bidirectional communication with an external device. This command is, for example, a command that has been conventionally used for transmitting display data to the remote controller is extended and used based on a code that is not used for communication with the remote controller. In addition,
When the external device is a personal computer, it is more preferable to set the communication speed to be high.

On the other hand, when SLAVE TYPE DATA is not returned, it is determined that the connected external device is a remote controller. Not limited to this, SLAVE
Such a determination may be made when TYPEDATA is a value other than the defined value. When the external device is a remote control, the setting is made so that display data is transmitted to the external device. The communication speed and the like are set to default values.

When the communication method is determined in step S13, the determined communication method is notified to the connected external device in the next step S14. Then, on the recording / reproducing apparatus 1 side, a display according to the determined communication method is made on the display unit 30. For example, when the external device is a personal computer and performs bidirectional communication, "PC-LINK" or the like is displayed on the display unit 30 to indicate that (step S1).
5).

Prior to the notification of the determined communication method in step S14, the recording / reproducing apparatus 1 sends the external device a SLAVE T as fixed data.
YPE DATA is sent. As a result, the negotiation process is established, and the next step is triggered. If the determined value is not the expected value, the slave can stop or limit the communication. This is the same even when the determined value is a default value. As described above, in the present invention, both the master device and the slave device authenticate each other and perform communication.

Further, in the above description, as the negotiation process, the master device requests the slave device for the device type, but the slave device may request the master device for the device type. In this case, the slave device requests a device type from the master device, and in response to the request, the master device issues a MASTER TYPE to the slave device.
It is assumed that the negotiation process has been established when DATA is returned.

Between the recording / reproducing apparatus 1 and an external device,
The subsequent communication is performed according to the communication method determined in step S13.

As an example, as shown in FIG. 1, when a personal computer 100 is connected as an external device to the recording / reproducing apparatus 1, in the above-described step S13, bidirectional high-speed communication is performed, and A communication method is determined so that display data accompanying a change in the state of the recording / reproducing apparatus 1 is not transmitted to the personal computer 100.

The predetermined software installed in the personal computer 100 causes the recording / reproducing apparatus 1 to send a U-format to the recording / reproducing apparatus 1 from the disk 90 loaded in the recording / reproducing apparatus 1.
A command is issued to read the TOC data. In the recording / reproducing apparatus 1, based on this command, the U-
Read the TOC data. The read U-TOC data is transmitted to the personal computer 100.

In the personal computer 100, for example, track name editing processing is performed using predetermined software based on the transmitted U-TOC data. The edited and updated U-TOC data is transmitted to the recording / reproducing apparatus 1, and the U-TOC data on the disk 90 is rewritten and updated. As described above, by using the present invention, it is possible to connect the personal computer 100 to the recording / reproducing apparatus 1 and edit the U-TOC data of the disk 90 loaded in the recording / reproducing apparatus 1.

As another example, when a remote controller corresponding to the recording / reproducing apparatus 1 is connected to the recording / reproducing apparatus 1 as an external device, the above-described step S13 is performed.
The communication speed is set to a default value, and the recording / reproducing apparatus 1 is unidirectionally transmitted from the recording / reproducing apparatus 1 to the remote controller.
The communication method is determined so that the display data accompanying the state transition is transmitted. The operation of the recording / reproducing apparatus 1 is controlled by a key signal based on the operation of the remote controller,
To the remote controller, display data accompanying the state transition is transmitted based on the determined communication method. The display based on the transmitted display data is displayed on the display unit of the remote controller.

Note that, in the master device, for example, the negotiation may not be established because the device type returned from the slave device is undefined. In such a case, communication between the master device and the slave device is performed under default conditions.

In some cases, during the negotiation process, the master device or the slave device cannot reply to the other party. In such a case, if the master device cannot reply, the SKIP command is returned. If the slave device cannot reply, a WAIT command is returned to the other party. After these commands are returned, the next packet is waited. In other cases, the negotiation is terminated.

In the above description, the present invention has been described as being applied to a portable audio device, but this is not limited to this example. As long as a plurality of types of devices can be connected as external devices for performing data communication, the present invention can be applied to other devices.

[0066]

As described above, according to the present invention, when communicating between a master device and a slave device,
First, a negotiation process is performed to determine the type of the slave device, and a communication method is determined based on the determination result. Therefore, remote control with one terminal,
This has the effect of enabling communication with a plurality of types of external devices such as personal computers.

Further, according to this embodiment, the determination of the slave device is made automatically when the slave device is connected to the master device. Therefore, there is an effect that switching of the communication method according to the type of the slave device can be automatically performed without providing a switch for switching connection.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of a configuration of a communication system according to an embodiment.

FIG. 2 is a block diagram illustrating an example of a configuration of a recording / reproducing device.

FIG. 3 is an external view of an example of a plug used corresponding to a remote control connection portion and a headphone jack.

FIG. 4 is a schematic diagram illustrating a configuration of one bit of data used for communication.

FIG. 5 is a schematic diagram illustrating a configuration of one byte of data used for communication.

FIG. 6 is a schematic diagram illustrating a packet configuration of data used for communication.

FIG. 7 is a flowchart illustrating an example of a communication procedure performed between a master device and a slave device.

FIG. 8 is a schematic diagram illustrating an example of a device type value.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording / reproducing apparatus, 11 ... System controller, 12 ... Memory controller, 13 ... Buffer memory, 22 ... Headphone jack, 23 ...
Remote controller connection unit, 30 display unit, 90 magneto-optical disk, 100 personal computer, 1
01 ... Interface converter, 102,103
..Cables, 110, plugs, 121, 122,
123, 124 ... electrode terminals, 1 to T4 ... terminals

Claims (4)

[Claims] An electronic device to which a slave device as an external device is connected, a connection unit to which the slave device is connected, a communication unit that communicates with the slave device via the connection unit, and the communication unit An electronic device comprising: an authentication unit for performing communication and mutually authenticating with the slave device, and permitting a start of data communication with the slave device when the authentication is confirmed. . 2. The electronic device according to claim 1, wherein the authentication unit performs the authentication by requesting a device type from the slave device through communication by the communication unit. 3. The electronic device according to claim 1, wherein, if the authentication is not successful, the slave device is a remote control commander. 4. A communication method performed between a master device and a slave device connected as an external device to the master device, wherein: a connection step in which the slave device is connected to the master device; When the slave device is connected to the master device in the connection step, an authentication step of performing communication between the master device and the slave device and performing mutual authentication, and authentication by the authentication step are determined. Permitting the start of data communication between the master device and the slave device.