JP2005073022A - Broadcast receiving device, and device, method, and program for remote control - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a broadcast receiving device to automatically determine which operation key can operate a remote control device, and to display the operation key in an understandable way in the remote control device. <P>SOLUTION: A broadcast receiving device 3 decodes a reception signal received by a channel selecting/decoding portion 31 through a broadcasting wave into a TS or a baseband signal. Operation available information which determines an operation key operable at a remote control device 2 is generated from the TS or the baseband signal by a reception signal interpreting portion 32. The operation available information is transmitted to the remote control device 2 as a display signal sg2 by a display signal modulating/transmitting portion 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a broadcast receiving device that receives a program broadcast via a broadcast wave and a remote control device that remotely operates the broadcast reception device, and presents operation keys that can be operated from the broadcast receiving device to the user by using the remote control device. The present invention relates to a user interface technology that makes it possible to do this.

  Conventionally, as a user interface of a broadcast receiving apparatus for digital broadcasting, a remote control system (hereinafter referred to as a remote control system) in which an operation unit is physically separated from a main body of the broadcast receiving apparatus is used. A remote control device used in such a remote control system has an operation unit such as an operation key, and has a function of transmitting a result of operation of the operation unit in one direction to a broadcast receiving device as a controlled device by wired or wireless means. I have. Thus, the user can perform a desired operation on the broadcast receiving device from the remote control device.

  In addition, as a bidirectional remote control system applying bidirectional communication, a technique is disclosed in which, after an operation key of a remote control device is operated, whether the operation key is valid or invalid is determined by a return signal from a broadcast receiving device ( For example, see Patent Document 1.) In this technology, after an operation key of a remote control device is pressed, whether or not the operation key is valid is indicated on the screen by the broadcast receiving device or the operation key is caused to emit light. . Such a remote control device has been reported as a bidirectional remote control device.

Furthermore, a technique for improving the usability of the remote control device by providing an operation mark by a light emitting means or the like on an operation key is disclosed (for example, see Patent Document 2). According to this technology, the user-friendliness of the remote control device is improved by associating the menu screen of the display unit of the broadcast receiving device with the operation position mark of the operation unit of the remote control device (for example, protrusion of the operation key or emission color). Can be made.
JP-A-11-341573 (paragraph numbers 0017 to 0027, FIGS. 1 and 2) JP 2001-359179 A (paragraph numbers 0007 to 0027, FIGS. 1 to 5)

  However, for example, in the operation of a broadcast receiving apparatus for digital broadcasting, in addition to conventional television channel switching and volume adjustment, a large number (for example, 30 or more) operations such as an “arrow” key and a “color” key A key is required, and the operation of the remote control device tends to be more complicated than a conventional television receiver. That is, the task of searching for an operation key to be operated from among such a large number of operation keys is generally troublesome for the user, and may be a factor that hinders the behavior of comfortably using the original digital broadcasting. Become. As described above, one of the causes that complicates the operation of the remote control device is that the operation keys that are originally used properly according to the operation purpose are uniformly arranged in one operation unit of the remote control device due to physical structure restrictions. This is due to the fact that it is implemented by such a method.

  As an approach to improve such a mounting method, a device such as dividing the remote control device into a plurality of parts, providing a lid on an operation key that is not frequently used, or providing an operation key on the back side of the remote control device is also performed. ing. However, this structure also causes problems such as difficulty in finding operation keys that are not frequently used. Attempts have also been made to reduce the number of operation keys of a remote control device used in a broadcast receiving apparatus for digital broadcasts, but there are also disadvantages such as the number of operation keys being limited and the functions that can be operated are limited. Furthermore, it is possible to implement a method such as displaying the operation unit as a part of the content on the data broadcast screen, etc. Therefore, there is a problem that the operation keys on the operation unit on the remote control device side and the picture display on the broadcast receiving device side cannot be displayed accurately in correspondence with each other.

  The technique of Patent Document 1 is to determine whether an operation key is valid or invalid after an operation key of a remote control device is operated, and the user selects an operation key before operating the remote control device. It cannot be applied to technology for supporting Furthermore, the technique of the above-mentioned patent document 2 is provided with an operation mark on the operation key of the remote control device to associate it with the screen display of the broadcast receiving device, and the mark is placed on the operation key having a unique function. Not attached. In addition, providing an operation mark on the operation key of the remote control device is not suitable for application to a screen that cannot be modified by a controlled device such as a data broadcast reception screen. In other words, the data broadcast reception screen is different from the Internet web browser, etc., and the display content, such as the size of characters and colors, is determined by the broadcast station, so the remote control device is used on the broadcast reception device side. Part of it cannot be changed. For example, it is not possible to explain how to use the operation keys of the remote control device by adding characters and figures on the broadcast receiving device side to the data broadcast reception screen.

  The present invention has been made in view of the problems as described above, and the broadcast receiving apparatus automatically determines which operation keys can be operated on the remote control device, and displays the operation keys in an easy-to-understand manner on the remote control device. By doing so, the remote control device that can support the user to select the operation key, the broadcast receiving device that is remotely operated by the remote control device, and the remote operation of the broadcast receiving device by exchanging signals between the remote control device and the broadcast receiving device. An object of the present invention is to provide a remote control method to be realized and a remote control program for causing a computer to realize the remote control.

  The present invention has been developed to achieve the above object, and first, the broadcast receiving device according to claim 1 can be operated by a remote control device based on a received signal received via a broadcast wave. A broadcast receiving device that performs operation corresponding to an operation key by transmitting operation enable / disable information indicating operation key information to the remote control device and receiving operation information indicating operation key information pressed by the remote control device. Thus, the demodulating unit, the operation availability determining unit, the operation availability information transmitting unit, the operation information receiving unit, and the control unit are provided.

  According to such a configuration, the broadcast receiving apparatus receives the reception signal received via the broadcast wave of digital broadcast or analog broadcast by the demodulating means as a transport stream (Transport Stream; TS) (when receiving digital broadcast) or baseband. Demodulate to signal (when receiving analog broadcast). Then, the broadcast receiving apparatus determines which operation key of the remote control apparatus is operable based on the transport stream or the baseband signal by the operation availability determination unit.

  For example, it is possible to determine what operation keys are valid on the current screen by acquiring program information from a transport stream that identifies a program selected by channel selection. Further, for example, by detecting whether or not voice or characters are multiplexed in the baseband signal, it is possible to determine whether or not the operation keys for [voice switching] and [caption] are valid.

Also, the broadcast receiving device transmits the determination result of the operation availability determination unit to the remote control device as operation availability information by the operation availability information transmission unit. As a result, the remote control device can recognize the currently effective operation key. In addition, it is possible to present to the user operation keys that can be used at present by the light emitting means or the like.
Then, the broadcast receiving device receives operation information indicating information of the pressed operation key from the remote control device by the operation information receiving unit, and the control unit performs an operation corresponding to the operation key, for example, a “number” key. The operation such as the channel switching by, the switching to the data broadcasting by the “d (data)” key is executed.

  The broadcast receiving apparatus according to claim 2 is the broadcast receiving apparatus according to claim 1, wherein the operation availability determination unit analyzes the content description language included in the demodulated signal so that the operation in data broadcasting is performed. Content description language analyzing means for determining whether or not the key is operable is provided.

  According to such a configuration, the broadcast receiving device analyzes which content description language is broadcast as a digital broadcast data broadcast by the content description language analysis means, thereby determining which operation keys of the remote control device can be operated. Can be determined. The content description language is a language that structurally describes content contents using tags (“<”, “>”). For example, BML (Broadcast Markup Language) used in digital broadcast data broadcasting Can be used.

  This BML is a page description language for data broadcasting based on XML (extensible Markup Language), formulated by ARIB (Radio Industry Association), and can be extracted from the payload (data part) of a TS packet. It is. In addition, in this BML, for example, a transition operation by the “arrow” key of the remote control device can be defined on a certain display screen. Thereby, the operation availability determination unit can determine which “arrow” key is valid on the display screen by referring to the definition.

  Furthermore, in the broadcast receiving device according to claim 3, in the broadcast receiving device according to claim 1 or 2, the operation availability determination unit analyzes the program information included in the demodulated signal, thereby Program information analysis means for determining whether or not an operation key can be operated in a program indicated by program information is provided.

  According to such a configuration, the broadcast receiving apparatus determines the effective operation key for each program by analyzing the program information included in the demodulated signal by the program information analysis means. This program information is an attribute of a program defined in advance by a broadcasting station or a program producer. For example, SI (Service Information: program arrangement information) and PSI (Program Specific Information: program specifying information) in digital broadcasting are used. Equivalent to. By analyzing the SI and PSI, the program information analysis means can detect the number of videos, the number of sounds (monaural, stereo, bilingual, etc.), the presence / absence of caption broadcasting, and the like in the program. Accordingly, the operation availability determination unit can determine whether or not operation keys such as [video switching], [audio switching], and [subtitles] are valid. SI and PSI are standardized by “ARIB STD-B10: Program arrangement information used for digital broadcasting”.

  The broadcast receiving device according to claim 4 is an operation key operable in the broadcast receiving device according to any one of claims 1 to 3 by analyzing an operation state of the broadcast receiving device. It is characterized by comprising an operation state analyzing means for determining the above.

  According to such a configuration, the broadcast receiving apparatus analyzes the state of its own operation state (for example, the operation state of the tuner or the volume setting state) by the operation state analysis unit, An operation key that can be operated is determined in accordance with the set state. Here, the self operation state refers to, for example, operation contents and setting contents in the broadcast receiving apparatus main body such as a tuner operation state and a volume setting state. Thus, for example, by detecting that the tuner is operating, the broadcast receiving apparatus can determine whether or not the operation key for adjusting the volume is valid. Alternatively, by detecting a state where the volume is currently set to the minimum, the broadcast receiving apparatus can determine that the operation key for lowering the volume is not effective.

  Furthermore, the remote control device according to claim 5 is based on operation availability information indicating information on operation keys that can be operated on the remote control device, transmitted from a broadcast receiving device that receives broadcast waves. The remote control device displays whether or not the operation key is an operation target and operates the broadcast receiving device based on the operation key to be operated, and includes an operation availability display unit for each operation key. An operation unit, an operation availability information reception unit, a display function control unit, and an operation information transmission unit are provided.

  According to this configuration, the remote control device receives the operation availability information from the broadcast receiving device by the operation availability information receiving unit, and which operation key can be operated by the operation availability display unit provided for each operation key of the operation unit. Displays whether or not it exists. This display can be performed, for example, by causing the light emitting element to emit light when the operation enable / disable display means for each operation key is used as the light emitting element. As a result, the user can recognize the operation keys that can be operated by the remote control device.

  According to a sixth aspect of the present invention, there is provided the remote control method according to the sixth aspect of the present invention, wherein the remote control device displays operation enable / disable information indicating information on operation keys operable by the remote control device based on a received signal received by the broadcast reception device via a broadcast wave. A remote control method for presenting operation keys operable by the remote control device by transmitting to a demodulation step, an operation availability determination step, an operation availability information transmission step, an operation availability information reception step, and a display And a function control step.

  According to this procedure, in the remote control method, in the broadcast receiving apparatus, the reception signal received via the broadcast wave of the digital broadcast or the analog broadcast in the demodulation step, the transport stream (when receiving the digital broadcast) or the baseband signal Demodulate (when receiving analog broadcast). Then, the remote control method determines which operation key of the remote control device can be operated based on the transport stream or the baseband signal in the operation availability determination step, and operates in the operation availability information transmission step. Operation enable / disable information indicating whether or not the key can be operated is transmitted to the remote control device.

  Then, in the remote control device, the remote control device receives the operation availability information transmitted from the broadcast receiving device in the operation availability information reception step, and in the display function control step, for each operation key based on the operation availability information. It controls the operation availability display means provided. For example, by using only a light emitting element corresponding to an operation key that can be operated with the operation availability information as a light emitting element as the operation availability display means, the user can recognize the operation key that is currently operable with the remote control device. Is possible.

  Furthermore, the remote control program according to claim 7 is for transmitting, to the remote control device, operation enable / disable information indicating information on operation keys operable on the remote control device, based on a received signal received via a broadcast wave. The broadcast receiving apparatus functions as a demodulation unit, an extraction unit, a content description language analysis unit, and an operation availability information transmission unit.

  According to this configuration, the remote control program demodulates the received signal received via the broadcast wave by the demodulating means, and extracts the content description language describing the contents of the data broadcast content from the demodulated signal by the extracting means. For example, BML (Broadcast Markup Language) is extracted from a transport stream of data broadcasting. In this content description language, for example, a transition operation by an “arrow” key of a remote control device can be defined on a certain display screen. Thus, the remote control program can determine the operation key used to view the content by analyzing the content description language by the content description language analysis means. Then, the remote control program converts the operation key determined to be used for viewing the content by the operation availability information transmitting means into a signal that can be recognized by the remote control device, and transmits the signal as operation availability information to the remote control device. For example, operation enable / disable information indicating “true” when the operation key is operable and “false” when the operation key is not operable is transmitted to the remote control device by infrared rays, radio waves, or the like. As a result, the remote control device can recognize the currently effective operation key.

According to the first aspect of the present invention, the broadcast receiving apparatus can notify (send) information indicating the operation key that can be operated at present to the remote control apparatus based on the received signal received via the broadcast wave.
According to the second aspect of the present invention, the broadcast receiving apparatus operates as a data broadcast related key by interpreting BML, which is a description language for television broadcasting that describes the program content of the currently received data broadcast. Possible operation keys can be notified (sent) to the remote control device.

According to the third aspect of the present invention, when the broadcast wave received by the broadcast receiving apparatus is a digital broadcast, video, audio, subtitle, and data broadcast from program information such as PSI / SI information extracted from the transport stream The information indicating which operation key can be operated can be notified (sent) to the remote control device.
According to the fourth aspect of the present invention, the broadcast receiving apparatus determines the operation state of the tuner, the volume setting state, and the like, and determines which operation key can be operated in accordance with the setting state. The information shown can be notified (sent) to the remote control device.

According to the invention described in claim 5, the remote control device can present to the user whether or not each operation key can be operated based on the operation availability information received from the broadcast receiving device. . Thus, the user can easily select the operation keys that can be operated with the remote control device, perform a desired operation, and remotely operate the broadcast receiving device.
According to the sixth aspect of the present invention, the broadcast receiving apparatus automatically determines which operation keys can be operated on the remote control device, and illuminates the operation keys that can be operated on the remote control device. Display in state. Thereby, it is possible to support the operation of selecting the operation key when the user operates the remote control device in an easy-to-operate state.

  According to the seventh aspect of the invention, the broadcast receiving device determines which operation key of the remote control device can be operated based on the content description language, and determines whether or not the operation key can be operated. Information is transmitted to the remote control device. Accordingly, the user can confirm the operation keys that can be operated on the remote control device at a glance and perform an operation.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Outline of bidirectional remote control system]
First, an outline of a bidirectional remote control system including a remote control device and a broadcast receiving device according to the present invention will be described with reference to FIG. FIG. 1 is a conceptual diagram showing a concept of a bidirectional remote control system in which a broadcast receiving device is operated by a remote control device. The bidirectional remote control system 1 includes a remote control device 2 and a broadcast receiving device 3.

  When the user operates (presses) a desired operation key 2a, the remote control device 2 transmits information (operation information) of the pressed operation key 2a to the broadcast receiving device 3 as a remote control signal sg1, and the broadcast receiving device 3 Is remotely controlled. In addition, the remote control device 2 displays the operation key 2a that can be operated by a lamp based on the display signal sg2 transmitted from the broadcast receiving device 3 (light emission), so that the operation key 2a that can be operated by the user is displayed. It is also something to present.

The broadcast receiving apparatus 3 receives a broadcast program via a broadcast wave and presents video, audio, data, and the like. At this time, the broadcast receiving apparatus 3 performs an operation desired by the user (channel switching, volume adjustment, etc.) based on the remote control signal sg1 transmitted from the remote control apparatus 2. The broadcast receiving device 3 also transmits information (operation availability information) of the operation key 2a of the remote control device 2 operable on the current screen to the remote control device 2 as a display signal sg2.
In this way, by configuring the bidirectional remote control system, the user can recognize which operation keys 2a are currently usable by the remote control device 2.

[Configuration of bidirectional remote control system]
Next, with reference to FIG. 2, the configuration of the remote control device and the broadcast receiving device that constitute the bidirectional remote control system will be described. FIG. 2 is a block diagram showing configurations of a remote control device and a broadcast receiving device that constitute the bidirectional remote control system.

(Configuration of remote control device)
The remote control device 2 includes an operation unit 21, a remote control signal modulation / transmission unit 22, a display unit 23, and a display signal reception unit 24.
The operation unit (operation means) 21 includes a plurality of operation keys (see FIG. 1) for operating the broadcast receiving device 3, and accepts an operation on the broadcast receiving device 3 when the user presses the operation key. is there.

  The remote control signal modulation / transmission unit (operation information transmission means) 22 transmits operation information corresponding to the operation key to the broadcast receiving device 3 when the operation key is pressed. That is, the remote control signal modulation / transmission unit 22 generates a code corresponding to the operated operation key, and transmits this code as a remote control signal sg1 to the broadcast receiving apparatus 3 by infrared rays or radio waves.

The display unit (operation availability display means) 23 displays whether or not each operation key can be operated. For example, whether or not the operation key can be operated is displayed by a lamp corresponding to each operation key.
The display signal receiving unit (operation availability information receiving unit) 24 receives the display signal sg2 transmitted from the broadcast receiving device 3 and controls the display unit 23. That is, the display signal receiving unit 24 displays the lamps of the display unit 23 corresponding to the operation keys for the operation keys that can be operated based on the operation availability information notified by the display signal sg2.

Here, the detailed configuration of the remote control device 2 will be described with reference to FIG. Here, in particular, the internal configurations of the remote control signal modulation / transmission unit 22 and the display signal reception unit 24 will be described. FIG. 3 is a block diagram showing an internal configuration of the remote control device.
The remote control signal modulation / transmission unit 22 includes a key state reading circuit 22a, a transmission code storage unit 22b, a calculation unit 22c, a waveform generation unit 22d, and a light emitting element 22e. The display signal receiving unit 24 includes a receiving antenna 24a, a demodulator 24b, a display state storage unit 24c, and a display driving circuit 24d.

First, in the remote control signal modulation / transmission unit 22, the key state reading circuit 22 a detects a key state indicating whether or not the operation key is pressed on the operation unit 21. The detected key state is notified to the calculation unit 22c.
The transmission code storage unit 22b stores a predetermined code corresponding to the operation key, for example, a key ID that can be understood by the broadcast receiving apparatus 3, and is a storage medium such as a general semiconductor memory. .

  The computing unit (display function control means) 22c is display on / off that is control information for turning on / off the display of the display unit 23 for each operation key based on the operation availability information demodulated by the demodulator 24b of the display signal receiving unit 24. The display function of the display unit 23 is controlled by notifying the display drive circuit 24d of the information. In addition, when the key state reading circuit 22a notifies the key state that the operation key is pressed, the calculation unit 22c reads the key ID corresponding to the operation key from the transmission code storage unit 22b, and the code string (remote control) This is also notified to the waveform generator 22d as a code string.

The waveform generation unit 22d modulates (brightness modulates) the remote control code string indicating the key ID acquired from the calculation unit 22c into a remote control signal for spatial transmission and outputs the modulated remote control signal to the light emitting element 22e.
The light emitting element 22e outputs (radiates) the remote control signal output from the waveform generation unit 22d to the broadcast receiving device 3 by infrared rays. For example, the luminance of a light emitting element such as an LED or a laser diode is modulated and output.
Although the light emitting element 22e is used here, when the remote control signal is output by radio waves, the waveform generation unit 22d may output the remote control signal after modulating the remote control signal into a high frequency carrier wave. In this case, frequency modulation, amplitude modulation, phase modulation, pulse modulation, other modulation methods, or a method in which the above-described modulation methods are multiplexed can be used for modulation.

In the display signal receiving unit 24, the receiving antenna 24a receives the display signal sg2 output (radiated) from the broadcast receiving device 3 and transfers it to the demodulator 24b.
The demodulator 24b receives the operation availability information indicated by the display signal sg2 output from the receiving antenna 24a, and notifies the operation availability information to the calculation unit 22c of the remote control signal modulation / transmission unit 22.

The display state storage unit 24c stores information indicating ON / OFF of the display (display unit 23) corresponding to the operation availability information interpreted by the calculation unit 22c of the remote control signal modulation / transmission unit 22, for example, a bit string corresponding to the display lamp. The storage medium is a storage medium such as a general semiconductor memory. In addition, by storing information indicating the on / off state of the display unit 23 in the display state storage unit 24c, the on / off state of the display unit 23 can be maintained even when the display signal sg2 is not received. Is possible.
The display driving circuit 24d performs the blinking operation of the lamp of the display unit 23 based on the display on / off information notified from the calculation unit 22c of the remote control signal modulation / transmission unit 22.

  Here, with reference to FIG. 4 (refer to FIG. 3 as appropriate), the operation unit 21 and the display unit 23 will be described in detail. FIG. 4 is a circuit diagram illustrating a configuration example of the operation unit 21 and the display unit 23. Here, the circuit configuration is such that the switches sw and the light emitting elements op are arranged in a matrix on each of the horizontal signal lines w to z and each of the vertical signal lines 1 to 16. Further, here, the key top display kt of each operation key is also shown in the lower right of the switch sw in FIG.

  In this circuit, the signal lines w to z are alternately at the L level (that is, the potential level at which current flows) in a sufficiently short cycle, and the signal lines 9 to 16 are alternately at the H level (that is, the potential at which current flows) at a sufficiently short cycle. Level) is repeated. In other words, when any one of the signal lines 9 to 16 is at the H level, the circuit configuration is such that a current flows during a period when the signal lines w to z corresponding to the matrix form are at the L level.

  For example, when it is desired to turn on the light emitting element op1 corresponding to the operation key [1] (key top display kt is [1]) at the intersection of the signal line z and the signal line 9, the display drive circuit 24d has the signal line z of L During the level period, the signal line 9 is set to the H level to supply a drive current to the light emitting element op1. That is, the display driving circuit 24d repeats such an operation at the timing of the H and L levels of each signal line, so that the driving current can be supplied to only the target light emitting element to light the lamp.

  The key state reading circuit 22a of the remote control signal modulation / transmission unit 22 constantly monitors the voltage application states of the signal lines w to z and the signal lines 1 to 8. Thus, for example, when the operation key [1] connected to the intersection of the signal line z and the signal line 1 is pressed and the switch sw1 (contact) is closed, the signal line 1 is only in the period when the signal line z is at the L level. Is at the L level, the key state reading circuit 22a can acquire the contact ON information that the operation key [1] is pressed. As described above, the display driving circuit 24d for lighting each light emitting element and the key state reading circuit 22a for detecting the ON state of each operation key operate independently.

As described above, by configuring the remote control device 2, the remote control device 2 acquires information on operation keys that can be currently operated from the broadcast receiving device 3, and gives only the operation keys that can be operated to the user. It can be presented so that it can be identified by a lamp or the like.
Returning to FIG. 2, the description of the configuration of the bidirectional remote control system will be continued.

(Configuration of broadcast receiver)
The broadcast receiving apparatus 3 includes a channel selection / demodulation unit 31, a reception signal interpretation unit 32, a display signal modulation / transmission unit 33, a screen drawing / display unit 34, a remote control signal reception unit 35, and an operation state analysis unit 36. ing.

  The channel selection / demodulation unit (demodulation means) 31 demodulates a reception signal received via a broadcast wave by a reception antenna (not shown). In other words, the channel selection / demodulation unit 31 selects a desired carrier wave from the broadcast wave, and transports a digital broadcasting transport stream (Transport Stream; TS) defined by the MPEG (Moving Picture Experts Group) system standard, or It demodulates to a baseband signal (video signal, audio signal) for analog broadcasting. The demodulated signal (transport stream or baseband signal) demodulated here is output to the received signal interpretation unit 32.

  The received signal interpretation unit (operation availability determination means) 32 interprets the demodulated signal demodulated by the channel selection / demodulation unit 31 and outputs it to the screen drawing / display unit 34 as video, audio, data, and the like. Further, the received signal interpretation unit 32 interprets the demodulated signal demodulated by the channel selection / demodulation unit 31 to determine which operation key of the remote control device 2 can be operated in the current screen state. But there is. The operation enable / disable information indicating the operation enable / disable of each operation key determined here is output to the display signal modulation / transmission unit 33.

  Here, the detailed configuration of the received signal interpreter 32 will be described with reference to FIG. FIG. 5 is a block diagram illustrating a detailed configuration of the reception signal interpretation unit 32. Here, the received signal interpretation unit 32 includes a PID (Packet Identifier) filter unit 32a, a BML interpretation unit 32b, a PSI / SI interpretation unit 32c, a character multiplexed signal separation / demodulation unit 32d, a program number detection unit 32e, and an audio subcarrier demodulation unit. 32f and a pilot signal detector 32g.

  The PID filter unit (extraction means) 32a extracts a TS packet of the target data broadcast PID (designated PID) from the transport stream in the digital broadcast input from the channel selection / demodulation unit 31, and performs BML interpretation. This is output to the unit 32b. This PID is an identification number uniquely assigned to each stream of the transport stream. For example, by extracting a TS packet having a PID corresponding to the currently selected data broadcast stream, only the BML broadcast by the data broadcast or the TS packet constituting the program information is converted to the BML interpreter 32b or the PSI. / SI can be output to the interpretation unit 32c.

  The BML interpretation unit (content description language analysis means) 32b extracts BML code, which is a description language for television broadcasting describing the contents of content, from the payload (data portion) of the TS packet output from the PID filter unit 32a. Then, by interpreting the BML code, it is determined which operation key is the operation key related to the currently received data broadcast. Also, this determination result is transmitted to the display signal modulation / transmission unit 33 as data broadcast related key information (operation availability information). A method for determining an operation key related to data broadcasting from the BML code will be described later in detail (described in FIG. 7).

  The PSI / SI interpretation unit (program information analysis means) 32c is currently receiving by extracting the program information from the payload (data portion) of the TS packet output from the PID filter unit 32a and interpreting the program information. It is determined which operation keys are effective in the broadcast program. The determination result is transmitted to the display signal modulation / transmission unit 33 as operation availability information. Here, the program information is an attribute of a program specified in advance by a broadcasting station or a program producer on digital broadcasting. For example, SI information (Service Information) in digital broadcasting, PSI This corresponds to information (Program Specific Information; program identification information). A method for determining an operation key related to the program from the program information will be described in detail later (described in FIG. 8).

  The character multiplexed signal separation / demodulation unit 32d extracts, from the analog broadcast video signal that is the baseband signal output from the channel selection / demodulation unit 31, a text broadcast packet that is a character multiplexed signal superimposed on the video signal. Is. The character multiplexed signal separation / demodulation unit 32d demodulates the code of the character multiplexed broadcast superimposed on the horizontal scanning period 21H (the 21st horizontal scanning period 1 to 525) of the video signal to extract the character broadcast packet. The teletext packet extracted here is output to the program number detection unit 32e.

The program number detection unit 32e acquires the teletext packet output from the text multiplexed signal separation / demodulation unit 32d and detects the program number “999” representing subtitle broadcast with reference to the table of contents, etc. Is determined. This determination result is transmitted to the display signal modulation / transmission unit 33 as operation availability information.
The audio subcarrier demodulation unit 32 f demodulates a pilot signal carried at a pilot signal frequency from an analog broadcast audio signal that is a baseband signal output from the channel selection / demodulation unit 31. The pilot signal demodulated here is output to pilot signal detector 32g.

The pilot signal detector 32g detects a pilot signal frequency corresponding to a pilot signal of two voices such as bilingual and commentary broadcast (sub voice) at the frequency of the pilot signal decoded by the voice subcarrier demodulator 32f. In this case, the presence / absence of multi-language audio broadcasting such as bilingual and commentary broadcasting is determined. This determination result is transmitted to the display signal modulation / transmission unit 33 as operation availability information.
In this way, by configuring the reception signal interpretation unit 32, it is possible to determine an operation key that is effective for the broadcast program being received.
Returning to FIG. 2, the description of the broadcast receiving device 3 will be continued.

  The display signal modulation / transmission unit (operation availability information transmission means) 33 transmits the operation availability information that is the determination result of the reception signal interpretation unit 32 to the remote control device 2 as the display signal sg2. In other words, the display signal modulation / transmission unit 33 can determine the determination result by the reception signal interpretation unit 32 in an appropriate method that the display unit 23 of the remote control device 2 can understand, for example, “true” when operable, and inoperable. In this case, the display signal sg2 is configured based on information indicating “false”, and the display signal sg2 is transmitted to the display signal receiving unit 24 of the remote control device 2 by infrared rays, radio waves, or the like.

The screen drawing / display unit (control unit) 34 outputs (displays) the video signal and the audio signal demodulated by the channel selection / demodulation unit 31. The screen drawing / display unit 34 also draws a screen by analyzing BML included in the transport stream demodulated by the channel selection / demodulation unit 31 as data broadcasting.
The screen drawing / display unit 34 recognizes the pressed operation key based on the operation information received by the remote control signal receiving unit 35 and executes an operation corresponding to the operation key. For example, when switching of a channel is instructed by an operation key, the program is switched to video, audio, data, etc. corresponding to the channel and displayed.

  The remote control signal receiving unit (operation information receiving means) 35 receives operation information indicating an operation key signal pressed from the remote control device 2. The operation information received here is transmitted to each part of the broadcast receiving apparatus 3 as a control signal. For example, when the remote control signal sg1 corresponding to the operation key for switching the channel is received, the received signal interpretation unit 32 interprets only the demodulated signal (broadcast program) corresponding to the channel.

  The operation state analysis unit (operation state analysis means) 36 determines the operation keys that can be operated by analyzing the operation state (tuner operation state, volume setting state, etc.) of the broadcast receiving device 3, and is the determination result. The operation propriety information is transmitted to the display signal modulation / transmission unit 33. For example, when a tuner (not shown) is operating, it is determined that an operation key for adjusting the volume is valid. At this time, if the volume is set to the minimum in the current setting, it is determined that the operation key for lowering the volume is invalid.

By configuring the broadcast receiving device 3 in this way, the broadcast receiving device 3 determines an operation key that can be operated by the remote control device 2 based on the received signal received through the broadcast wave, and You can be notified.
Further, the control of the remote control device 2 in the broadcast receiving device 3 can be realized by causing a general computer to execute a program and operating an arithmetic device or a storage device in the computer. This program (remote control program) can be distributed by data broadcasting by describing it in BML.

[Operation of bidirectional remote control system]
Next, the operation of the bidirectional remote control system 1 will be described with reference to FIG.
First, the broadcast receiving apparatus 3 demodulates the received signal received via the broadcast wave by the channel selection / demodulation unit 31 (demodulation step), and the transport stream or base included in the demodulated signal by the received signal interpretation unit 32. Based on the band signal, it is determined which operation key of the remote controller 2 is operable (operation availability determination step). Then, the display signal modulation / transmission unit 33 transmits the determination result to the remote control device 2 as operation availability information (display signal sg2) (operation availability information transmission step). Note that the broadcast receiving device 3 transmits the operation keys operable in the current operation state in the broadcast receiving device 3 to the remote control device 2 as operation availability information (display signal sg2) by the operation state analyzing unit 36.

On the other hand, the remote control device 2 receives this operation availability information (display signal sg2) by the display signal receiving unit 24 (operation availability information receiving step), and the operation key that can be operated indicated by the operation availability information by the display unit 23. The lamp is made to emit light (display function control step).
Through the above operation, the bidirectional remote control system 1 can show the operation keys that can be operated at the current time on the remote control device 2 when the user views the broadcast program on the broadcast reception device 3.

(Operation key discrimination operation)
Here, with reference to FIG. 6 (refer to FIG. 2 as appropriate), the operation of determining the currently usable operation keys in the broadcast receiving apparatus 3 in the bidirectional remote control system 1 will be described. FIG. 6 is a flowchart showing an operation of discriminating operation keys that can be operated by the remote control device 2 in the broadcast receiving device 3.

  First, the broadcast receiving apparatus 3 sets an operation key to be determined as an invalid key other than the “power” key, by using an initial setting unit (not shown), prior to the start of operation key determination. . In other words, the received signal interpretation unit 32 performs default setting so that operation keys other than the “power” key are in an invalid state as an initial state (step S1). This setting corresponds to clearing (initialization) of variables when the received signal interpretation unit 32 is operated.

  Then, the broadcast receiving apparatus 3 uses the received signal interpretation unit 32 to determine which operation keys can be operated using the operation keys related to the data broadcast being received (step S2). The operation keys related to this data broadcast are operation keys that can be received (recognized) by a data broadcast reception browser (BML browser) that converts BML broadcast as data broadcast into a display format.

Next, the broadcast receiving device 3 uses the received signal interpretation unit 32 to determine which operation key is valid in the received program format from among the operation keys that are not received by the data broadcast receiving browser (step S3).
Then, the broadcast receiving device 3 is effective in the current operation state among the operation keys that the operation signal analyzing unit 32 did not determine as the effective operation keys in the step S2 and the step S3. The operation key is determined (step S4).
Then, the broadcast receiving device 3 transmits operation enable / disable information indicating the operable operation keys determined in step S2 to step S4 to the remote control device 2 by the display signal modulation / transmission unit 33 (step S5).

Note that this operation key determination operation is a loop process, and while the broadcast receiver 3 is powered on, the determination result is updated while executing the process repeatedly at regular intervals. Further, in an initial state such as immediately after the power of the broadcast receiving device 3 is turned on, the on / off states of the operation keys other than limited operation keys such as the “power” key and the “volume” key are indefinite. Become. However, as soon as the operation of each part of the broadcast receiving device 3 is started and the first determination process (steps S2 to S4) is executed, the state of each operation key is established in a stable state, so that the power is turned on. Considering the output time of the display of the broadcast receiving apparatus 3 immediately after the time, the time is not a problem.
Hereinafter, the operation in each step of Step S2 to Step S4 will be described in detail.

<Data broadcasting related key discrimination operation>
First, referring to FIG. 7 (refer to FIG. 5 as appropriate for the configuration), the data broadcast related key discriminating operation will be described. FIG. 7 is a flowchart showing an operation of discriminating a data broadcast related key. This operation corresponds to step S2 in FIG. 6 and is performed by the BML interpretation unit 32b of the reception signal interpretation unit 32.
In the BML interpretation unit 32b, each operation key is subjected to a discrimination process by the following two methods ((A) and (B)).

(A) Discriminating process based on <nav-key-1ist> characteristic In BML, whether or not to use the operation key of remote control device 2 in the BML browser is determined by the <key-group> value of <nav-key-1ist> characteristic. Defined. That is, by referring to the value of <key-group>, it is possible to determine which operation key is necessary in data broadcasting. The target operation keys are “number” keys such as [0] to [9], “channel selection” keys of [CH +] and [CH−], and “volume” of [volume +] and [volume−]. ”Key,“ color ”key of [red] / [blue] / [yellow] / [green],“ decision ”key and“ return ”key of [decision] and [return].

(B) Discriminating process by <nav-index> characteristic In BML, an operation when an operation key is pressed is defined by a <nav-index> characteristic. That is, it is possible to determine which operation key is necessary in data broadcasting by referring to the value of the <nav-index> characteristic.
Specifically, the element (for example, a button on the screen) currently focused (selected) on the BML browser is detected from the <nav-index> characteristic, and the focus is moved from that element. When the destination is defined, it is determined that the “arrow” key for moving the focus is operable.

  As a definition at this time, for example, when the focus can be moved from the currently focused (selected) element A to the element B with the upward “arrow” key, the BML code includes < The <nav-index> value of the element B is defined as nav-up> characteristic value. Similarly, for the downward, left, and rightward movements, the <nav-down>, <nav-1eft>, and <nav-right> characteristic values become the <nav-index> value of the destination element. If there is no destination, it is described as “none”, so it is possible to determine whether or not the destination is defined.

Hereinafter, description will be given with reference to the flowchart of FIG.
First, the BML interpretation unit 32b determines whether a TS packet is input, that is, whether a data broadcast is being received (step S11). Here, when the data broadcast is not received (No in step S11), it is not necessary to determine the operation key in the data broadcast, and thus the operation ends.
On the other hand, when the data broadcast is received (Yes in step S11), the BML code is acquired (extracted) from the TS packet of the data broadcast being received (step S12).

(A) Discriminating process based on <nav-key-1ist> characteristic Then, the BML interpretation unit 32b uses basic operation keys (a “decision” key and a “return” key) as a <key-group> value of the BML code. It is determined whether or not “basic” to be shown is defined (step S13). Here, when “basic” is defined (Yes in step S13), it is set in the operation availability information that the “decision” key and the “return” key are valid (step S14), and the process proceeds to step S15. On the other hand, if “basic” is not defined (No in step S13), the process proceeds to step S15.
In BML, “basic” is used as a “decision” key, a “return” key, and an “up / down / left / right” key. Here, the “up / down / left / right” key has priority in the <nav-index> characteristic. It shall be determined.

  Then, the BML interpretation unit 32b uses “data” indicating four color buttons (“red”, “blue”, “yellow”, and “green” “color” keys) as <key-group> values of the BML code. It is determined whether or not “-button” is defined (step S15). Here, when “data-button” is defined (Yes in step S15), the “color” key is set to be valid / invalid information (step S16), and the process proceeds to step S17. On the other hand, if “data-button” is not defined (No in step S15), the process directly proceeds to step S17.

  Further, the BML interpretation unit 32b determines whether or not “numerical-tuning” indicating a “number” key ([0] to [9], etc.) is defined as the <key-group> value of the BML code. (Step S17). Here, when “numerical-tuning” is defined (Yes in step S17), it is set in the operation availability information that the “number” key is valid (step S18), and the process proceeds to step S19. On the other hand, if “numerical-tuning” is not defined (No in step S17), the process proceeds to step S19.

  Further, the BML interpretation unit 32b defines “other-tuning” indicating a key for increasing / decreasing a channel (a “channel selection key of [CH +] and [CH−])” as a <key-group> value of a BML code. It is determined whether or not it has been performed (step S19). Here, when “other-tuning” is defined (Yes in step S19), the operation permission / prohibition information is set that the “channel selection” key is valid (step S20), and the process proceeds to step S21. On the other hand, if “other-tuning” is not defined (No in step S19), the process directly proceeds to step S21.

  Then, the BML interpretation unit 32b determines whether or not “misc” indicating another key is defined as the <key-group> value of the BML code (step S21). Here, when “misc” is defined (Yes in step S21), it is set in the operation availability information that the “volume” key is valid (step S22), and the process proceeds to step S23. On the other hand, if “misc” is not defined (No in step S21), the process directly proceeds to step S23.

Note that BML defines “misc” as another key. However, in general, it is difficult to use other keys other than the “volume” key in data broadcasting, so “misc” is defined here. If it is determined, the “volume” key is determined to be valid.
The operation so far (steps S13 to S22) corresponds to the discrimination processing based on the above-described (A) <nav-key-1ist> characteristic.

(B) Discriminating process based on <nav-index> characteristic Next, the BML interpretation unit 32b converts the object (element) currently focused (selected) on the screen (on the BML browser) into the <nav-index> characteristic. Based on the identification (step S23).
Then, the BML interpretation unit 32b determines whether or not the <nav-up> characteristic value is defined as the <nav-index> value of the BML code (whether there is an upward movement destination) (step S24). ). Here, when the <nav-up> characteristic value is defined (Yes in step S24), it is set in the operation availability information that the “up arrow” key is valid (step S25), and the process proceeds to step S26. On the other hand, if the <nav-up> characteristic value is not defined (No in step S24), the process directly proceeds to step S26.

  Further, the BML interpretation unit 32b determines whether the <nav-down> characteristic value is defined as the <nav-index> value of the BML code (whether there is a downward movement destination) (step S26). ). Here, when the <nav-down> characteristic value is defined (Yes in step S26), the “down arrow” key is set as valid in the operation availability information (step S27), and the process proceeds to step S28. On the other hand, if the <nav-down> characteristic value is not defined (No in step S26), the process directly proceeds to step S28.

  Then, the BML interpretation unit 32b determines whether or not the <nav-left> characteristic value is defined as the <nav-index> value of the BML code (whether there is a leftward movement destination) (step S28). ). Here, if the <nav-left> characteristic value is defined (Yes in step S28), the “left arrow” key is set as valid in the operation availability information (step S29), and the process proceeds to step S30. On the other hand, if the <nav-left> characteristic value is not defined (No in step S28), the process directly proceeds to step S30.

  Furthermore, the BML interpretation unit 32b determines whether or not the <nav-right> characteristic value is defined as the <nav-index> value of the BML code (whether there is a rightward destination) (step S30). ). Here, when the <nav-right> characteristic value is defined (Yes in step S30), the operation right / left information is set to be valid (step S31), and the operation ends. On the other hand, if the <nav-right> characteristic value is not defined (No in step S30), the operation ends without setting the operation availability information.

Note that steps S23 to S31 correspond to the discrimination processing based on the (B) <nav-index> characteristic described above.
By the above operation, the BML interpretation unit 32b can determine the operation keys related to the data broadcast being received from the BML code.

<Receiving program related key discrimination operation>
Next, referring to FIG. 8 (refer to FIG. 5 for the configuration as appropriate), the operation key determining operation related to the program being received will be described. FIG. 8 is a flowchart showing the operation of determining operation keys related to the program being received. This operation corresponds to step S3 in FIG.

  First, the PSI / SI interpretation unit 32c determines whether or not there are a plurality of videos broadcast in the program (step S41). Here, when there are a plurality of videos (Yes in step S41), it is set in the operation availability information that the “video switching” key is valid (step S42), and the process proceeds to step S43. On the other hand, when there are not a plurality of videos (No in step S41), the process proceeds to step S43 as it is.

In addition, in order to detect the number of videos (number of streams) broadcasted in a program, publicly known information disclosed in “ARIB STD-B10: Program Sequence Information Used for Digital Broadcasting” (Radio Industry Association) This technique can be used.
For example, at the time of digital broadcast reception, the PSI / SI interpretation unit 32c refers to a PMT (Program Map Table) in which an identification number (PID) of a TS packet in a broadcast program being received is referred to, and a stream indicating the stream format The number of videos can be detected by counting the number of items whose format identifier value represents video (“01” or “02”). As a result, the PSI / SI interpretation unit 32c can determine that the “video switching” key is valid when there are a plurality of videos. In analog broadcasting, since there is no concept of multiple images, the number of images is “1”.

  Next, the PSI / SI interpretation unit 32c or the pilot signal detection unit 32g determines whether or not there are a plurality of audio broadcasts in the program (step S43). Here, when there are a plurality of voices (Yes in step S43), it is set in the operation availability information that the “voice switching” key is valid (step S44), and the process proceeds to step S45. On the other hand, when there are not a plurality of voices (No in step S43), the process proceeds to step S45 as it is.

In addition, in order to detect the number of audio broadcasts (number of streams) in a program, it can be performed using a known technique disclosed in “ARIB STD-B10” as in the case of video.
For example, at the time of digital broadcast reception, the PSI / SI interpretation unit 32c counts the number of items in which the stream format identifier value represents audio (“03”, “04”, or “0F”) in audio as well as video. By doing so, the number of voices can be detected. Furthermore, for audio, even if it is a single stream, the component type of the audio component descriptor in the packet of PES (Packetized Elementary Stream; packetized stream) is dual monaural (“02”), multiple languages (“ 04 ") and the like are detected as a plurality of sounds. Thus, the PSI / SI interpreter 32c can determine that the “voice switching” key is valid when there are a plurality of voices.

At the time of analog broadcast reception, the pilot signal detection unit 32g corresponds to the pilot signal of two voices such as bilingual and explanation broadcast (sub voice) at the frequency of the pilot signal decoded by the voice subcarrier demodulation unit 32f. By detecting the pilot signal frequency to be detected, the presence / absence of multi-audio broadcasting such as bilingual and commentary broadcasting is determined.
Then, the PSI / SI interpretation unit 32c or the program number detection unit 32e determines whether or not a caption broadcast is being broadcast in the program (step S45). Here, when a caption broadcast is being broadcast (Yes in step S45), the operation propriety information is set that the “caption” key is valid (step S46), and the process proceeds to step S47. On the other hand, if the subtitle broadcast is not broadcast (No in step S45), the process proceeds to step S47 as it is.

In order to detect a caption broadcast broadcast in a program, a known technique disclosed in “ARIB STD-B24: Data Broadcast Coding Method and Transmission Method in Digital Broadcasting” (Radio Industry Association) Can be used.
For example, at the time of digital broadcast reception, the PSI / SI interpretation unit 32c refers to the PMT in which the identification number (PID) of the TS packet in the broadcast program being received is referenced, and the stream format identifier value indicating the stream format Is a value representing PES (“02”) and the value of the data encoding scheme descriptor is a value representing caption / super (“08”), it can be determined that caption broadcasting is being broadcast. .

  At the time of analog broadcast reception, the program number detection unit 32e uses the character multiplexed signal separation / demodulation unit 32d to code the character multiplexed broadcast superimposed on the horizontal scanning period 21H (21st of horizontal scanning periods 1 to 525) of the video signal. By detecting the program number “999” representing subtitle broadcast with reference to the table of contents or the like from the teletext packet demodulated, it is possible to determine the presence or absence of subtitle broadcast.

Then, the BML interpretation unit 32b determines whether the data broadcast is being received based on whether a TS packet is input (step S47). Here, if it is determined that the data broadcast is received (Yes in step S47), the “d (data)” key is set as valid in the operation availability information (step S48), and the operation is terminated. On the other hand, if it is determined that the data broadcast has not been received (No in step S47), the operation is terminated without setting the operation availability information. The determination of whether or not the “d (data)” key can be operated based on the presence / absence of the data broadcast may be performed in step S11 shown in FIG.
With the above operation, the received signal interpreter 32 can determine the operable operation keys from the currently received broadcast program.

<Broadcast receiving device state-related key discrimination operation>
Next, referring to FIG. 9 (refer to FIG. 2 as appropriate), an operation for determining an operable key based on the state (operation state, setting state) of the broadcast receiving apparatus will be described. FIG. 9 is a flowchart showing the operation key discrimination operation according to the state of the broadcast receiving apparatus. This operation corresponds to step S4 in FIG.

  First, the operation state analysis unit 36 determines whether or not a tuner (not shown) is operating (step S51). Here, when the tuner is operating (Yes in step S51), the “channel selection” key of [CH +] and [CH−] is set to be valid information (step S52), and step S53 is set. Proceed to On the other hand, if the tuner is not operating (No in step S51), the process proceeds directly to step S53.

  Then, the operation state analysis unit 36 detects the current volume setting state, and determines whether the mute or volume is set to the minimum (step S53). If the mute or volume is set to the minimum (Yes in step S53), the process proceeds to step S55. If the mute or volume is not set to the minimum (No in step S53), [volume- ] “Volume” key is set as valid / invalid information (step S54).

Further, the operation state analysis unit 36 determines whether or not the sound volume is set to the maximum in the current sound volume setting state (step S55). Here, when the volume is set to the maximum (Yes in step S55), the operation is ended without setting the operation availability information. On the other hand, if the volume is not set to the maximum (No in step S55), the “volume” key of [volume +] is set as valid / invalid information (step S56), and the operation is terminated.
With the above operation, the operation state analysis unit 36 can determine the operation keys that can be operated based on the current state of the broadcast program apparatus.

  The operation for determining the operation key that can be operated by the remote control device 2 in the broadcast receiving device 3 has been described above. The operation availability information set by this operation is obtained from the display signal modulation / transmission unit 33 (see FIG. 2). Via the remote control device 2. Thereby, the user who operates the remote control device 2 can easily know which operation key is the currently effective operation key according to the display state of the operation key.

(Correspondence between operation key discrimination and each operation key)
Here, FIG. 10 summarizes the correspondence between the operation key determination operation described in FIGS. 7 to 9 and each operation key determined by the determination operation. FIG. 10 is a correspondence table showing the correspondence between the operation key discrimination operation and each operation key.

  In FIG. 10, whether each operation key of the key top (display of the operation surface of the operation key) kt corresponds to the data broadcast related key dk determined by the data broadcast related key determination operation described with reference to FIG. The broadcast receiving apparatus state-related key sk determined by the broadcast receiving apparatus state-related key determining operation described with reference to FIG. 9 corresponds to the receiving program-related key rk determined by the receiving program-related key determining operation described in FIG. It shows whether it corresponds. Note that the shaded column indicates that the operation key is not a discrimination target.

  Here, the operation key determined to be operable as the data broadcast related key dk is determined by the value of <key-group> of BML. For example, when “numerical-tuning” is defined as the <key-group> value, it is determined that the “number” key ([0] to [9], etc.) is operable. Further, when “other-tuning” is defined as the <key-group> value, it is determined that the “channel selection” keys of [CH +] and [CH−] are operable. If “data-button” is defined, it is determined that the “color” keys of [red], [blue], [yellow], and [green] are operable.

  Also, when “misc” is defined as the <key-group> value, the “volume” key of “volume +” and “volume−”, “video switch” key, “audio switch” key, “subtitle” "Key" and "data" key are determined to be operable. However, here, the “video switching” key, “audio switching” key, “caption” key, and “d (data)” key give priority to other items and can be operated as the program-related key rk during reception. Is determined.

  Furthermore, when “basic” is defined as the <key-group> value, it is determined that the “decision” key, the “return” key, and the “up / down / left / right” key are operable. Here, the “up / down / left / right” key gives priority to other items, and it is determined whether or not it can be operated as the broadcast receiving apparatus state related key sk.

  In addition to the <key-group> value, the value of BML <nav-index> also determines whether the data broadcast-related key dk can be operated. For example, when the <nav-up> characteristic value is defined as the <nav-index> value, it is determined that the “up (arrow)” key is operable. Further, when the <nav-down> characteristic value is defined as the <nav-index> value, it is determined that the “down (arrow)” key can be operated. Further, when the <nav-left> characteristic value is defined as the <nav-index> value, it is determined that the “left (arrow)” key can be operated. Further, when the <nav-right> characteristic value is defined as the <nav-index> value, it is determined that the “right (arrow)” key can be operated.

In addition, the operation keys to be discriminated as the program-in-reception key rk and the broadcast receiving apparatus state-related key sk are the operation keys marked with ○ in the figure.
As described above, by classifying the operation keys as the data broadcast related key dk, the receiving program related key rk, and the broadcast receiving apparatus state related key sk, it is possible to determine which operation key is valid. .

It is a conceptual diagram which shows the concept of the bidirectional | two-way remote control system which concerns on this invention. It is a block diagram which shows each structure of the remote control apparatus and broadcast receiving apparatus which comprise the bidirectional | two-way remote control system which concerns on this invention. It is a block diagram which shows the internal structure of the remote control apparatus which concerns on this invention. 4 is a specific circuit example of an operation unit and a display unit of the remote control device according to the present invention. It is a block diagram which shows the structure of the received signal interpretation part of the broadcast receiver which concerns on this invention. 6 is a flowchart showing an operation of discriminating operation keys that can be operated by a remote control device in the broadcast receiving apparatus according to the present invention. 6 is a flowchart showing an operation of discriminating a data broadcast related key in the broadcast receiving apparatus according to the present invention. 6 is a flowchart showing an operation key discriminating operation related to a program being received in the broadcast receiving apparatus according to the present invention. 5 is a flowchart showing an operation key discriminating operation according to the state of the broadcast receiving apparatus in the broadcast receiving apparatus according to the present invention. 5 is a correspondence table showing a correspondence relationship between operation key determination operations and operation keys.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bidirectional remote control system 2 Remote control device 21 Operation part (operation means)
22 Remote control signal modulation / transmission unit (operation information transmission means)
22a Key state reading circuit 22b Transmission code storage unit 22c Calculation unit (display function control means)
22d Waveform generating unit 22e Light emitting element 23 Display unit (operation availability display means)
24 Display signal receiving unit (operation availability information receiving means)
24a reception antenna 24b demodulator 24c display state storage unit 24d display drive circuit 3 broadcast receiving device 31 channel selection / demodulation unit (demodulation means)
32 Received signal interpreter (operation availability determination means)
32a PID filter part (extraction means)
32b BML interpreter (content description language analysis means)
32c PSI / SI interpreter (program information analysis means)
32d Character multiplexed signal separation / demodulation unit 32e Program number detection unit 32f Audio subcarrier demodulation unit 32g Pilot signal detection unit 33 Display signal modulation / transmission unit (operation availability information transmission means)
34 Screen drawing / display unit (control means)
35 Remote control signal receiver (operation information receiver)
36 Operation state analysis unit (operation state analysis means)

Claims (7)

Based on a received signal received via a broadcast wave, operation enable / disable information indicating information on operation keys that can be operated by the remote control device is transmitted to the remote control device, and information on operation keys pressed by the remote control device is indicated. A broadcast receiving device that performs an operation corresponding to the operation key by receiving operation information,
Demodulation means for demodulating the received signal;
Based on the demodulated signal demodulated by the demodulating means, an operation availability judging means for judging whether or not each operation key of the remote control device is operable,
An operation propriety information transmitting unit that transmits the determination result of the operation propriety determination unit to the remote control device as the operation propriety information;
Operation information receiving means for receiving the operation information indicating the information of the pressed operation key from the remote control device;
Control means for recognizing the pressed operation key based on the operation information received by the operation information receiving means and executing an operation corresponding to the operation key;
A broadcast receiving apparatus comprising:   The operation availability determination means includes content description language analysis means for determining whether or not the operation key is operable in data broadcasting by analyzing the content description language included in the demodulated signal. The broadcast receiving apparatus according to claim 1.   The operation availability determination means includes program information analysis means for determining whether or not an operation key can be operated in a program indicated by the program information by analyzing the program information included in the demodulated signal. The broadcast receiving apparatus according to claim 1, wherein the broadcast receiving apparatus is provided.   The broadcast reception according to any one of claims 1 to 3, further comprising operation state analysis means for determining an operable key by analyzing an operation state of the broadcast reception device. apparatus. Whether or not each operation key is an operation key to be operated is determined based on operation availability information transmitted from a broadcast receiving device that receives broadcast waves and indicating operation key information that can be operated by a remote control device. A remote control device for displaying and operating the broadcast receiving device based on an operation key to be operated;
An operation means comprising an operation availability display means having a display function indicating whether or not the operation key is operable, for each operation key;
Operation availability information receiving means for receiving the operation availability information;
Display function control means for controlling the display function of the operation availability display means based on the operation availability information received by the operation availability information receiving means;
Operation information transmitting means for transmitting operation information corresponding to the operation key to the broadcast receiving device when the operation key is pressed;
A remote control device comprising: The broadcast receiving device can operate the remote control device by transmitting to the remote control device operation enable / disable information indicating information of operation keys that can be operated on the remote control device based on a received signal received via a broadcast wave. A remote control method for presenting operation keys,
A demodulation step in which the broadcast receiving apparatus demodulates the received signal;
Based on the demodulated signal demodulated in this demodulation step, an operation propriety determination step for determining whether or not the operation key of the remote control device is operable,
An operation propriety information transmission step for transmitting the determination result determined in the operation propriety determination step to the remote control device as the operation propriety information;
An operation availability information receiving step in which the remote control device receives the operation availability information;
Based on the operation availability information received in the operation availability information receiving step by the remote control device, an operation availability display means provided for each operation key and having a display function indicating whether or not the operation key is operable. Display function control step for controlling,
The remote control method characterized by including. Based on a received signal received via a broadcast wave, in order to transmit operation enable / disable information indicating information on operation keys operable with the remote control device to the remote control device,
Demodulation means for demodulating the received signal;
Extraction means for extracting a content description language describing the content of the data broadcast content from the demodulated signal demodulated by the demodulation means;
Content description language analyzing means for determining an operation key used for viewing the content by analyzing the content description language extracted by the extracting means;
Operation enable / disable information transmitting means for converting an operation key determined to be used for viewing the content by the content description language analyzing means into a signal recognizable by the remote control device and transmitting the operation key to the remote control device as operation enable / disable information. ,
A remote control program characterized in that it functions as a remote control program.

Images