JP2002077750A - Tuning method and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus wherein a device capable of receiving a selected program is automatically retrieved by a simple operation to input only tuned program information a desired program is received by the retrieved device, the signal of the selected program is supplied to a viewing device, and the desired program can the viewed simply without performing a changeover operation to a device having a tuner function and without performing tuning on the side of the device having the tuning function. SOLUTION: The recognition of the device is executed at ST1, and the device having the tuner function is discriminated. When information on a program to be tuned is input at ST2, whether the program can be received by a built-in tuner or not is discriminated at ST3. When the program cannot be received, whether the device which can receive the program exists on a bus or not is discriminated at ST5. When it is discriminated that the device exists, a logical connection to the device having the tuner function is established at ST6. At ST7, a command which receives the selected program is issued to the device whose logical connection is established, and a tuning control operation is performed, At ST9, the program is output on the basis of a stream which is supplied from the device having the tuner function. The device having the tuner function and a tuning operation at the device having the tuner function can be performed automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tuning method and an electronic device. More specifically, a device having a tuner function capable of receiving a selected program is searched for from a device on the digital communication control bus, and a signal path is established between the searched device having the tuner function and the viewing device to control a control signal. Is transmitted, and the selected program is received by the searched device having the tuner function, and is controlled to be output from the viewing device.

[0002]

2. Description of the Related Art Conventionally, in order to not only watch an analog terrestrial broadcast program but also a satellite broadcast program or a broadcast program from a cable television, a viewing device such as a television device and an STB (Set Top Box) are used. And IRD (Integrated Rec.) Which is a receiving device with a built-in scramble decoder
As shown in FIG. 19, a tuner device such as an eiver / decoder is connected via an analog interface. Here, when viewing a satellite broadcast program or a distribution program on a viewing device, input switching is performed on the viewing device side, an input terminal to which the tuner device is connected is selected, and a desired program is received on the tuner device side. Tuning operation has been performed.

Further, a digital communication control bus for connecting a plurality of electronic devices, for example, a digital interface (hereinafter, “bus”) standardized as IEEE1394
By using this bus, one viewing device and a plurality of tuner devices can be connected, and a recording / reproducing device such as a video tape recorder or an optical disk device can also be connected.

[0004]

By the way, even when a viewing device and a tuner device are connected via a bus,
For example, when switching from a program being received by the tuner built into the viewing device to a program being received by the tuner device, the input switching operation must be performed on the viewing device side in the same way as when connecting via an analog interface. In addition to this, the tuner device must perform a tuning operation. Further, when a plurality of tuner devices are connected, it is necessary to confirm which tuner device receives the desired program and switch the input.

[0005] For this reason, when switching and viewing a desired program, input switching on the viewing device side and channel selection operation on the tuner device side must be repeated, so that the desired program can be easily viewed. Can not.

In view of the above, the present invention provides a channel selection method and an electronic device that allow a user to view a desired program with a simple operation when connecting and using a viewing device and a tuner device.

[0007]

A channel selection method according to the present invention comprises providing a device having a tuner function and a viewing device on a digital communication control bus capable of transmitting a control signal and an information signal in a mixed manner. Is performed, a device having a tuner function capable of receiving the selected program from the device on the digital communication control bus is searched, and a signal path is established between the searched device having the tuner function and the viewing device, and the connection is established. A control signal is transmitted through the selected signal path, and the selected program is received by the searched device having the tuner function and is controlled to be output from the viewing device.

An electronic apparatus according to the present invention is an electronic apparatus provided on a digital communication control bus capable of transmitting a control signal and an information signal in a mixed manner. A process of searching for a device having a tuner function capable of receiving a selected program from a device on the communication control bus; a process of establishing a signal path between the searched device having a tuner function; and It has control processing means for issuing a command to the device having the tuner function searched through the signal path and controlling the reception operation of the device having the tuner function.

In the present invention, a tuner device and an audio-visual device are provided on a digital communication control bus capable of transmitting control signals and information signals in a mixed manner, for example, an IEEE1394 bus. Here, when a program is selected, a command for receiving the selected program is issued,
A tuner device that can receive the selected program from the devices on the digital communication control bus is searched. Alternatively, information on the tuner function is read in advance, and a tuner device that can receive the selected program is searched from the read information on the tuner function. A point-to-point connection is established between the searched tuner device and the viewing device to establish a signal path, and a control signal is transmitted using the established signal path, and the searched tuner device is Receives the selected program.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of the receiving system. This receiving system connects a plurality of electronic devices using a digital communication control bus capable of transmitting control signals and information signals in a mixed manner, for example, a bus standardized as IEEE1394. In FIG. Viewing device 10 and STB (Set
The figure shows a case where tuner devices 11 and 12 such as a Top Box) and an IRD (Integrated Receiver / Decoder) are connected.

As shown in FIG. 2, each device includes a control processing block 30 for connecting to a bus. The physical layer control block 31 of the control processing block 30 performs initialization of a bus connecting the devices, arbitration of the right to use the bus, and the like. The link layer control block 32
And various control signals are communicated between them, and these signals are transmitted and received to and from the bus. The link layer control block 32 performs packet creation / detection, error correction processing, and the like. Then, the CPU 33 controls the physical layer control block 31 and the link layer control block 32 and performs processing relating to the application layer such as creation of commands and responses. When creating a command or response, the CPU 33 writes data to a predetermined address of a register provided in the link layer control block 32. Commands and responses transmitted by other devices are written to a predetermined address of the register, and then read by the CPU 33.

The CPU 33 includes a processing circuit 3 such as a signal processing circuit of a television apparatus or a tuning circuit of a tuner device.
5 is connected, and performs an operation according to the command supplied via the bus.

In the IEEE 1394 digital interface standard, a fixedly allocated 64-bit address space is used as shown in FIG. The upper 16 bits are a node ID (Node_ID), the upper 10 bits of the node ID are “bus_ID”, and the lower 6 bits are “physical”.
_ID ”. This “bus_ID” is for identifying a bus. When the “bus_ID” is 1023, it indicates a local bus, and specifies a bus directly connected to the device. "Physical_ID"
Is for identifying a node. Here, "phys
When the “ical_ID” is 63, it indicates broadcast, and all devices are designated.

The remaining 48 bits indicate an address in the device, and are divided into an initial memory space, a private space, and a register space. This register space is used for information exchange between devices. As shown in FIG.
CS standardized as EEE1212 (1212r)
It consists of a core register space for an R (Control and Status Register) architecture, a space for a serial bus, a configuration ROM space for representing the function of each node, and an initial unit space.

In the configuration ROM space, a Bus_Info_Block section and the like are provided in the general format, and the Bus_Info_Block section has a 3-byte “Node_Vendor_ID (Company_ID)” indicating a device release source, and a device release. There is provided a Node_Unique_ID composed of a 5-byte “Chip_ID” that can be freely determined in advance. In the case of the minimum format, "Vendor_ID (Com
pany_ID) "is provided.

In the initial unit space, "Output"
"Plug Control" register, "InputPlug Control" register, "FCP_COMMAND" for sending and receiving commands
A register and an “FCP_RESPONSE” register for transmitting and receiving a response to the command are provided.

Here, when the topology is changed at the start of operation or when a node is inserted or removed, a bus reset is performed, data reading or writing at each node is terminated, and data transfer is stopped. After that, signals are bidirectionally exchanged between the nodes, and processing for determining the node ID is performed. In the determination of the node ID, the node IDs are sequentially assigned in the order in which the buses are acquired. In addition, one node is elected as the root and
ronous) When communication is performed, this route is set as the cycle master that outputs a “Cycle Start” packet for maintaining the isochronous cycle, and the device with the maximum node ID value is the IRM (Isochr) for managing network resources
onous Resource Manager).

When performing data transfer, a bus use request is made before data transfer, and a route arbitrates a bus use request from each node. By this arbitration, a bus license is given to one node and data transfer is performed. Therefore, collision with a packet supplied from another node is prevented.

Next, when a signal such as an image or a sound or a control signal is transmitted via a bus between devices for recording / reproducing or inputting / outputting an image or a sound, for example, 1394T
AV / C Di standardized by A (Trade Association)
gital Interface Command Set General Specificatio
The transmission is performed in the packet format indicated by "n".

FIG. 5 shows the structure of a packet in asynchronous (Asynchronous) communication.
A function control protocol FCP (Function Control Protocol) standardized as IEC61883 by the onal Electrotechnical Commission (International Electrotechnical Commission) is used.

In this packet, the first 16-bit "destination_ID" indicates the node on the response side (reception side) of the transaction. The 6-bit transaction label "tl (Transaction label)" indicates a unique value for enabling only the requesting (sending) node and the responding node to recognize that the transaction is related to itself. The 2-bit retry code "rt (Retry
"code)" is a retry field, and indicates information on a retry method in a busy state. The 4-bit transaction code "tcode (Transaction cod
"e)" indicates that the packet is a block read request packet. The 16-bit “source_ID” indicates the node on the request side of the transaction. The 48-bit "destination_offset" is a destination address indicating, when the packet is, for example, a request packet, to which register position in the response side address space a request command or the like stored in "FCPframe" described later is to be written. Also, this is a destination address indicating which register position in the request-side address space to write read data or the like stored in the “FCP frame”. The 16-bit “data_length” indicates the block to be read or the length of the read block in bytes. “Header_CRC” is an area of CRC (Cyclic Redundancy Code) which is an error detection code of header information.

The "FCP frame" is an area for storing commands and data. When the packet is a request packet for making a read request, a read command is stored. When the packet is a response packet to the read request, the requested read data is stored.
“Data_CRC” is a CRC area for the “FCP frame”.

FIG. 6 shows the structure of the "FCP frame". FIG. 6A shows the case of a request packet, and FIG. 6B shows the case of a response packet. When using the AV / C protocol defined by 1394TA, the 4-bit “CTS (Command / Transa
ction Set) "is set to" 0000 ". In the request packet, the next 4 bits of “CT (Command type: ctype)” indicate the type of a command that makes a request to another device as shown in FIG. Or a command requesting operating status information (ST
ATUS), a command for notifying information (NOTIFY), and the like. Note that the subscript “16” indicates hexadecimal display.

In the response packet, a 4-bit "RC (Respons
e Code: response) ", a response type indicating a response to the command as shown in FIG. 8, for example, a response (ACCEPTE
D) or a response (REJ
ECTED), a response indicating that command execution is not supported (NOT IMPLEMENTED), a status indicating response (STABLE), an intermediate response (INTERIM), and the like.

For example, as shown in FIG. 9A, when a command is supplied from a controller (a device that outputs a request packet to another device) to a target (a device that receives a command and outputs a response packet), 10
The operation for the command is completed within 0 ms, and the response is supplied from the target side to the controller side.
If the operation is not completed within 100 ms, 1
The intermediate response is supplied to the controller within 00 ms, and then the final response is supplied to the controller.

The 5-bit "Su" following "CT" and "RC" in FIG.
The “bunit_type” and the 3-bit “Subunit_ID” indicate the destination of the command and the source of the response. In the “Subunit_type”, a subunit indicating a logical model of a function of a destination of a command or a transmission source of a response, that is, a subunit (Video monitor) of a function of displaying an image as shown in FIG. , A sub-unit (disc record)
er / player), a subunit (tape recorder / player) of a function of performing recording and reproduction using a tape, a subunit (Tuner) of a function of selecting a channel, and the like. For example, when the unit indicating the device itself is a television device, the television device has a tuner function and an image display function, and therefore, the television device has a function of selecting a channel with a monitor subunit of a function of displaying an image. Of tuner subunits. When the unit is a tuner device, it has a tuner subunit. When the unit is a stationary video tape recorder, the video tape recorder has a tuner function and a tape recording / reproducing function. It is a combination of recorder / player subunits.

When there are a plurality of subunits of the same type in the same unit, a discrimination number is indicated by “Subunit_ID” shown in FIG. 11 so that each subunit can be discriminated.

Further, the value of “Subunit_type” is set to “1”.
With the F ₁₆ "" By setting the value of Subunit_ID "to" 7 ", the command in the described below" OPC (opcode) ", be a command to the unit from the command for the first subunit Can be.

An 8-bit "OPC" shown in FIG. 6 indicates an instruction operation, and an "OPR (operand)" for every 8 bits following "OPC".
[0] to “OPR [n]” indicate additional information for the command “OPC”. The “OPC (opcode)” is divided into commands for units and subunits, commands for units, commands for subunits, and the like, as shown in FIG.

The request packet and the response packet shown in FIG. 6 are configured as described above. A command is supplied from the controller to the target by the asynchronous communication between the controller and the target, and a response is transmitted from the target to the controller. returned.

Next, the channel selection operation will be described. When the bus is reset at the start of operation or when a node is inserted or removed, device recognition is executed in step ST1 in FIG. 13 to determine a device having a tuner function. In the device recognition process, a device having a tuner subunit is determined using a command specified by 1394TA.

Specifically, each unit (equipment) targeted from a unit (equipment) which is a controller
When outputting a request packet to
The value of “e” is set to “1F ₁₆ ”, the value of “Subunit_ID” is set to “7”, and the Unit Commands shown in FIG.
(Ut command) issuance mode. In addition, "OP
The command “SUBUNIT INFO” for the unit is issued with the value of “C” set to “31 ₁₆ ”. This "SUBUNIT INFO"
Is a command that causes the unit that has received the command to respond to what subunit the unit that has received the command is configured.

From the unit on the target side, select "SUBUNIT
When a response packet to "INFO" is supplied, the contents of the information regarding the subunit are determined, and it is determined which unit has the tuner subunit.

As described above, the command “SUBUNIT INFO” is issued from the device on the controller side, the tuner subunit is determined based on the response packet from the device on the target side, and the determination result is sent to the device on the controller side. It is stored as tuner information. For example, the viewing device stores the Node_Unique_ID of the device having the tuner subunit as tuner information.

In step ST2, when viewing a broadcast program, for example, a channel selection operation screen shown in FIG. 15 is displayed on the screen of the viewing device. On this channel selection operation screen, for example, a broadcasting system such as analog terrestrial broadcasting, satellite broadcasting (CS broadcasting or BS broadcasting) or cable television is displayed, and when the displayed broadcasting system is selected, this broadcasting system is displayed. It is made possible to select the channel number in. Here, the channel selection operation is performed by the viewer,
When channel selection program information indicating which channel program is to be selected in which broadcast system is input, step ST
Proceed to 3.

In step ST3, it is determined whether or not the program indicated by the input channel selection program information can be received by the internal tuner of the viewing device. Here, when it is determined that reception is possible, the process proceeds to step ST4, and when it is determined that reception is not possible, the process proceeds to step ST5. For example, when the internal tuner of the audio-visual device 10 supports only analog terrestrial broadcasting and the broadcast system of the selected program is analog terrestrial broadcasting, step ST4 is performed.
Proceed to. If the broadcast system of the selected program is a satellite broadcast, the process proceeds to step ST5.

In step ST4, the selected program is received by the internal tuner, and the flow advances to step ST8.

In step ST5, it is determined whether or not a corresponding device capable of receiving the selected program exists on the bus. In the determination of the corresponding device, since the tuner information is stored in the device on the controller side, "AV / C" standardized by 1394TA is applied to the device having the tuner subunit indicated by the tuner information. Tuner M
odel and Command Set '' Tuner Subunit Commands
(Tuner subunit command) to search for compatible devices.

That is, “Subunit_typ” of the request packet
e ”is set to“ 5 ”and the value of“ OPC ”is set to“ C
8 ₁₆ ”, the command“ DIRECT SELECT INFORMATION TYPE ”of the tuner subunit command shown in FIG. 16 is issued. The value of “OPR” is set as a data value indicating the selected program. Further, by setting the value of “CT” to “0”, a command for receiving the selected program or setting the value of “CT” to “2” and inquiring whether or not the selected program can be received can be performed. Command.

Here, in the response packet from the device on the target side, the value of “RC” is “9” or “C ₁₆ ”, and when it is determined that the value is “ACCEPTED” or “IMPLEMENTED”, It is determined that the selected program can be received by the tuner subunit of the device. Also, "R
When the value of "C" is determined to be "8" and "NOT IMPLEMENTED", it is determined that the selected program cannot be received. Further, when the value of “RC” is determined to be “A ₁₆ ” and “REJECTED”, it is determined that there is a possibility that the selected program can be received. In this way, the corresponding device can be determined.

In the determination of the corresponding device, the command “DIRECT” is sequentially sent to all the devices indicated by the tuner information.
It is also possible to issue a SELECT INFORMATION TYPE to determine the response result, and when a tuner subunit with "RC" of "ACCEPTED" or "IMPLEMENTED" is detected, a tuner that can receive the selected program Assuming that the device has been detected, the determination of the corresponding device may be terminated. Furthermore, when the tuner subunit that is “REJECTED” is detected, the determination of the corresponding device may be terminated.

In step ST5, when it is determined that the corresponding device exists on the bus, that is, when a tuner device capable of receiving the selected program is detected, the process proceeds to step ST6. When it is not determined that the corresponding device exists on the bus, the channel selection operation is terminated.

In step ST6, a logical connection with the determined corresponding device is established. In this logical connection, for example, the viewing device on the controller side is an IRM (Isochronous Re-
The channel P for transmitting the information signal of the program and the necessary band are acquired from the source manager), and the channel P is set in the oPCR (Output Plug Control Register) of the determined corresponding device. In addition, the iPCR (Input
By setting a channel P in the Plug Control Register, a point-to-point logical connection is established and step S
Proceed to T7.

In step ST7, channel selection control is performed on the corresponding device for which the logical connection has been established. That is, for the tuner device for which the logical connection has been established, step ST5
In the same way as with the command "DIRECT SELECT INFORMATION TYP
Issue "E". In this case, since the selected program is selected by the corresponding device, the value of “CT” is “0”.
Issue a control command.

On the corresponding device side, this command "DIRECT S
A channel selection operation is performed based on “ELECT INFORMATION TYPE”, and the received transport stream TS is transmitted to the viewing device via channel P by isochronous communication.

By issuing the command “DIRECT SELECT INFORMATION TYPE” after the logical connection is established, the transport stream TS of the selected program can be obtained.
Can be correctly supplied to the viewing device 10.

In step ST8, when "RC" is set to "ACCEPTED" in the response packet from the corresponding device, the reception process of the transport stream TS is started, and thereafter, the transport stream TS is transmitted from the corresponding device by isochronous communication. The video stream and the audio stream are separated from the transport stream TS and decoded, and an image and a sound are output from the viewing device 10. When the process proceeds from step ST4 to step ST8, the image and sound are output from the audio-visual device 10 based on the signal received by the internal tuner.

As described above, only by inputting the selected program information, a device capable of receiving the selected program is automatically searched, and a desired program is received by the searched device. The signal of the selected program is supplied to the viewing device, and the image and sound of the program are output. Therefore, a desired program can be easily viewed without switching to a device having a tuner function capable of receiving the selected program or performing a channel selection operation on the device having the tuner function.

Also, since a device search is performed based on a response to a command for receiving the selected program,
The device that receives the selected program can be searched correctly.

By the way, in the above-described embodiment, after the program is selected, the command “DIRECT SELECT INFORMATION
TYPE "to determine the device that can receive the selected program. However, the device recognition in step ST1 not only determines the device having a tuner function, but also It may be determined in accordance with whether reception is possible.

In this case, in step ST1, the command “SUBUNIT INFO” is issued to determine the tuner sub-unit, and a sub-unit command is issued to the determined tuner sub-unit to obtain information on the tuner sub-unit. Is read. That is,
The value of “Subunit_type” of the request packet is set to “5”, and the value of “OPC” is set to “08 ₁₆ ” or “09 ₁₆ ”.
By issuing a command “OPEN DESCRIPTOR” or “READ DESCRIPTOR” common to the unit and the subunit in FIG. 17, the “Tuner Subunit Identifier Descripto” standardized by the “AV / C Tuner Model and Command Set”
Read r.

[Tuner Subunit Identifier Descripto]
r ”includes“ subunit_dependent_informati ”shown in FIG.
on "is provided, and as shown in FIG. 18A, the number of receivable systems and the specification" system_speci
fication ”and“ system_specification ”in FIG.
It is shown as B. This "system_specificatio
In “n”, “system_ID” indicates what kind of broadcast is received.

For this reason, the tuner subunit “Tune
By reading "r Subunit Identifier Descriptor", it is possible to determine what kind of broadcast program can be received. Also, information indicating what kind of broadcast system a program can be received is stored as tuner information in the unit on the control side.

In step ST5, a compatible device capable of receiving the selected program is determined based on the tuner information stored in the device on the control side. Here, since the tuner information indicates information indicating a device having a tuner subunit, and what kind of broadcast system program can be received in this tuner subunit, by using this tuner information, Devices that can receive the selected program can be easily searched. If the tuner device that can receive the program selected from the tuner information cannot be searched, the tuner device that can receive the selected program can be searched for by issuing the command “DIRECT SELECTINFORMATION TYPE” in the same manner as described above. .

As described above, when the device is recognized, the tuner function is determined and stored in detail in advance, and a desired program can be easily viewed even if the channel selection operation is performed using this information. . In addition, since the search is performed using the tuner function stored in advance, a device that can receive the selected program can be quickly detected.

In the above embodiment, a case has been described where the audio-visual device is the controller and the tuner device is the target. However, what kind of channel selection operation is performed on the target with the audio-visual device as the target. Even if the tuner is notified to the tuner device on the controller side and the channel selection process is performed in accordance with the channel selection operation, the desired program can be easily viewed in the same manner.

[0057]

According to the present invention, when a program is selected, a device having a tuner function capable of receiving the selected program is searched, and the searched device having the tuner function and the viewing device are searched. A signal path is established, a control signal is transmitted on the established signal path, and control is performed such that the selected program is received by the searched device having the tuner function and output from the viewing device. For this reason,
The selected program can be easily viewed without operating the device having the tuner function and the viewing device.

When searching for a device having a tuner function capable of receiving the selected program, a command for receiving the selected program is issued to the device having the tuner function, and the command is issued. Since it is determined whether or not the selected program can be received based on the response from the selected device, the device having the tuner function capable of receiving the selected program can be correctly determined.

Further, when searching for a device having a tuner function capable of receiving a selected program, information having a tuner function capable of receiving a program selected from this information is used as a device for pre-reading information on the tuner function. Determine. As described above, since the information read out in advance is used, it is possible to quickly identify a device having a tuner function capable of receiving the selected program.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a receiving system.

FIG. 2 is a diagram illustrating a configuration of a device connected to a bus.

FIG. 3 is a diagram showing an IEEE 1394 address space.

FIG. 4 is a diagram showing a register space.

FIG. 5 is a diagram showing a configuration of a packet.

FIG. 6 is a diagram showing a configuration of an FCP frame.

FIG. 7 is a diagram showing CT (ctype).

FIG. 8 is a diagram showing RC (response).

FIG. 9 is a diagram showing a processing operation.

FIG. 10 is a diagram showing Subunit_type.

FIG. 11 is a diagram showing Subunit_ID.

FIG. 12 is a diagram showing an OP (opecode).

FIG. 13 is a flowchart showing a channel selection operation.

FIG. 14 is a diagram showing Unit Commands.

FIG. 15 is a diagram showing a program selection screen.

FIG. 16 is a diagram showing Tuner Subunit Commands.

FIG. 17 is a diagram showing commands common to Unit / Subunit.

FIG. 18 is a diagram showing a Tuner Subunit Identifier Descriptor.

FIG. 19 is a diagram showing a configuration using an analog interface.

[Explanation of symbols]

10: audio-visual equipment, 11, 12: tuner equipment,
30: control processing block, 31: physical layer control block, 32: link layer control block, 35: processing circuit

Claims (6)

[Claims] An apparatus having a tuner function and an audio-visual apparatus are provided on a digital communication control bus capable of transmitting a control signal and an information signal in a mixed manner, and when a program is selected, the digital communication control bus is used. Searching for a device having a tuner function capable of receiving the selected program from the device, establishing a signal path between the searched device having the tuner function and the audio-visual device; and controlling the control signal on the established signal path. Transmission of
A tuning method, wherein the selected program is received by the searched device having a tuner function and is controlled to be output from the viewing device. 2. When searching for a device having a tuner function capable of receiving the selected program from devices on the digital communication control bus, the device having the tuner function is notified of the selected program. Issue a command to receive, based on the response from the device that issued the command,
2. The tuning method according to claim 1, wherein it is determined whether or not the selected program can be received. 3. A device having the tuner function is read in advance from a device having the tuner function, and when searching for a device having a tuner function capable of receiving the selected program from a device on the digital communication control bus, 2. A device having a tuner function capable of receiving the selected program is identified from the information on the tuner function read in advance.
The tuning method described. 4. An electronic device provided on a digital communication control bus capable of transmitting a control signal and an information signal in a mixed manner, wherein, when a program is selected, the device is selected from devices on the digital communication control bus. Processing for searching for a device having a tuner function capable of receiving the searched program; processing for establishing a signal path between the searched device having the tuner function; and processing for establishing a signal path via the established signal path. An electronic device, comprising: a control processing unit that issues a command to a searched device having a tuner function and performs a process of controlling a reception operation of the device having the tuner function. 5. The control processing means performs a process of searching for a device having a tuner function capable of receiving the selected program from a device on the digital communication control bus,
Issuing a command to receive the selected program to the device having the tuner function, and determining a device capable of receiving the selected program based on a response from the device to which the command is issued. The electronic device according to claim 4, wherein: 6. The control processing means includes a process of searching for a device having a tuner function capable of receiving the selected program from a device on the digital communication control bus,
5. The apparatus according to claim 4, wherein information relating to the tuner function is read in advance from a device having the tuner function, and a device capable of receiving the selected program is determined from the information relating to the tuner function read in advance.
Electronic equipment.