JP2019114853A - Broadcast receiver and broadcast reception method - Google Patents

Abstract

To realize more appropriate channel changeover according to change of reception state.SOLUTION: As the operation state of broadcast receiver 10, there are first state for making at least one of multiple receiving parts 21-26 select a specified broadcast station, making at least another of the multiple receiving parts 21-26 perform fixed search of candidate channel of any one relay station, and making yet another of the multiple receiving parts 21-26 perform patrol search of one or more candidate channels of the relay station, and a second state for making the receiving parts of larger number than that of the receiving parts for making select the specified broadcast station in the first state select channel of the specified broadcast station, and making at least one residual receiving part perform patrol search of one or more candidate channel. When both reception sensitivity of a channel during channel selection in first state and reception sensitivity of a channel during fixed search are below a reference value, a control section 20 makes transition from the first state to the second state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a broadcast receiving apparatus and a broadcast receiving method.

  In an on-vehicle television, the reception state of a television broadcast signal and the receivable broadcast stations may change as the vehicle mounted moves. By entering different broadcast areas, the reception status of some channels may be degraded, and by entering a tunnel, the reception status of all channels may be degraded. In such a case, it is preferable that an appropriate channel be automatically selected after that. For example, there is known a technique of selecting a most suitable channel by executing a search process a plurality of times and comparing a plurality of search results (see, for example, Patent Document 1).

JP 2014-116692 A

  When an optimal channel is selected after acquiring a plurality of search results in the case where the reception state is deteriorated, the processing time until the plurality of searches end is long. Preferably, the optimum channel can be selected in a shorter time.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a technique for realizing more appropriate channel switching according to a change in reception state.

  A broadcast receiving apparatus according to an aspect of the present invention includes a plurality of receiving units for receiving a broadcast signal, a control unit for controlling channels to be selected by the plurality of receiving units, and reproduction of broadcast content received on a channel being selected. And a reproduction processing unit. As the operation of the plurality of receiving units, a) at least one of the plurality of receiving units is tuned to the channel of the designated broadcasting station designated by the user, and at least one of the plurality of receiving units corresponds to the designated broadcasting station A first state in which fixed search is performed for any one candidate channel of the relay station, and cyclic search is performed for one or more candidate channels of the relay station corresponding to the designated broadcasting station to at least one of the plurality of receiving units; ) The channel of the designated broadcasting station is selected as the number of receiving units which is two or more of the plurality of receiving units and which is larger than the number of the receiving units which tunes the channel of the designated broadcasting station in the first state. And a second state in which at least one of the remaining receiving units performs cyclic search for one or more candidate channels of the relay station corresponding to the designated broadcasting station. The control unit shifts from the first state to the second state when both of the reception sensitivity of the currently selected channel in the first state and the reception sensitivity of the channel in the fixed search are lower than the reference value.

  Another aspect of the present invention is a broadcast reception method. In this method, at least one of the plurality of receiving units is tuned to the channel of the designated broadcasting station designated by the user, and at least one of the plurality of receiving units is one of the relay stations corresponding to the designated broadcasting station. Executing a first state in which one candidate channel is fixedly searched, and at least one other of the plurality of receiving units is cyclically searched for at least one candidate channel of the relay station corresponding to the designated broadcasting station; If both the reception sensitivity of the currently selected channel and the reception sensitivity of the channel under fixed search are less than the reference value, then from the first state, two or more reception units among the plurality of reception units The channel of the designated broadcasting station is tuned to the number of receiving units more than the number of receiving units for tuning the channel of the designated broadcasting station in the first state, and the remaining at least one receiving unit corresponds to the designated broadcasting station One of the relay stations Comprising the steps of shifting to the second state to cyclically search for candidate channel above, the.

  It is to be noted that any combination of the above-described constituent elements, or one in which the constituent elements and expressions of the present invention are mutually replaced among methods, apparatuses, systems, etc. is also effective as an aspect of the present invention.

  According to the present invention, it is possible to switch the channel more appropriately according to the change of the reception state.

It is a block diagram which shows typically the function structure of a broadcast receiving apparatus. It is a flowchart which shows the flow of the broadcast reception method typically.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The specific numerical values and the like shown in the embodiments are merely examples for facilitating the understanding of the invention, and the invention is not limited unless otherwise specified. In the present specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals to omit repeated description, and elements not directly related to the present invention are not illustrated. Do.

  FIG. 1 is a block diagram schematically showing a functional configuration of the broadcast receiving apparatus 10. As shown in FIG. Each functional block to be illustrated can be realized by hardware as an element such as a CPU or memory of a computer or as a mechanical device, and software can be realized as a computer program or the like. It is drawn as a functional block to be realized. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by a combination of hardware and software.

  The broadcast receiving apparatus 10 is an apparatus for receiving digital television broadcasts, and is an on-vehicle digital television receiving apparatus mounted and used in a mobile object such as a vehicle. The broadcast content received by the broadcast receiving apparatus 10 is reproduced through the display device 40 and the speaker 42. The user selects a broadcast station or channel to view through the input device 44. If the reception sensitivity of the selected channel is good, the broadcast content of the specified channel is displayed or output.

  The broadcast receiving apparatus 10 includes a receiving circuit unit 12, a reproduction processing unit 14, a control unit 20, and a storage unit 30. The broadcast receiving device 10 is connected to the display device 40, the speaker 42 and the input device 44. The display device 40 is a liquid crystal display or the like, and is mounted at a position of a center console or a dashboard of the vehicle. The speaker 42 is an on-vehicle speaker, a speaker provided adjacent to the display device 40, or the like. The input device 44 is, for example, a touch panel sensor, and is provided in the display area of the display device 40. The input device 44 may not be a touch type, and may be configured by a button or the like arranged around the display device 40.

  The receiving circuit unit 12 includes a first receiving unit 21, a second receiving unit 22, a third receiving unit 23, a fourth receiving unit 24, a fifth receiving unit 25, a sixth receiving unit 26, a first demodulating unit 31, and a second receiving unit. The demodulation unit 32 and the third demodulation unit 33 are provided. A different antenna is connected to each of the plurality of receiving units 21 to 26, and receives a broadcast signal of a selected channel through each antenna. Each of the plurality of receiving units 21 to 26 is configured to receive, for example, a terrestrial digital broadcast signal.

  The first demodulation unit 31 is connected to the first reception unit 21 and the second reception unit 22, and demodulates the broadcast signal received by the first reception unit 21 and the second reception unit 22. The second demodulation unit 32 is connected to the third reception unit 23 and the fourth reception unit 24, and demodulates the broadcast signal received by the third reception unit 23 and the fourth reception unit 24. The third demodulation unit 33 is connected to the fifth reception unit 25 and the sixth reception unit 26, and demodulates the broadcast signal received by the fifth reception unit 25 and the sixth reception unit 26. Each of the plurality of demodulation units 31 to 33 is configured to generate, for example, a transport stream (TS) signal from the received terrestrial digital broadcast signal.

  The first demodulation unit 31 is configured to combine and demodulate the reception signal of the first reception unit 21 and the reception signal of the second reception unit 22, and is configured to generate a demodulation signal by a so-called two diversity reception method. Similarly, the second demodulation unit 32 is configured to combine and demodulate the reception signal of the third reception unit 23 and the reception signal of the fourth reception unit 24, and the third demodulation unit 33 is configured of the fifth reception unit 25. The reception signal and the reception signal of the sixth reception unit 26 are combined and demodulated. By using the diversity reception method, it is possible to improve the reception performance during the movement of the mounted vehicle.

  The reception circuit unit 12 has three reception systems A, B, and C when operating in the two diversity reception method. For example, the A system includes the first receiver 21, the second receiver 22, and the first demodulator 31, and the B system includes the third receiver 23, the fourth receiver 24, and the second demodulator 32. The C system includes the fifth receiver 25, the sixth receiver 26, and the third demodulator 33. In this specification, the operation of the reception circuit unit 12 may be described as the operation of each of the three reception systems A to C. At this time, the correspondence between each of the reception systems A to C, the plurality of reception units 21 to 26 and the plurality of demodulation units 31 to 33 does not necessarily have to be fixed, and the correspondence is in accordance with the operation state. It may change dynamically.

  The receiving circuit unit 12 may be configured to be able to realize three or more diversity receptions, or may be configured not to use diversity reception. When diversity reception is not used, one demodulation unit may be provided for one reception unit. Also, the diversity reception scheme may be switched according to the sensitivity of the received signal. For example, when the sensitivity of the received signal is low, the received signals of the four reception units 21 to 24 are combined and demodulated. It may be configured.

  The reproduction processing unit 14 reproduces the broadcast content from the TS signal generated by any of the first demodulation unit 31, the second demodulation unit 32, and the third demodulation unit 33. The reproduction processing unit 14 includes a video processing unit 16 and an audio processing unit 18. The video processing unit 16 extracts video data from the acquired TS signal, and causes the display device 40 to display a video based on the extracted video data. The audio processing unit 18 extracts audio data from the acquired TS signal, and causes the speaker 42 to output an audio based on the extracted audio data.

  The reproduction processing unit 14 extracts program information, information for data broadcasting, and the like included in the TS signal, and generates a display screen for displaying the extracted information on the display device 40. The reproduction processing unit 14 generates an operation screen for enabling a user's input operation through the input device 44. For example, an operation screen for realizing channel tuning operation by the user, brightness adjustment of the display device 40, and volume adjustment of the speaker 42 is generated. In addition, the reproduction processing unit 14 generates a display screen for notifying an error such as reception impossibility when the channel currently selected is not received. The reproduction processing unit 14 may continue to display the image received immediately before that as a still image when the currently selected channel becomes unreceivable, or may continuously display a single color still image such as black. You may

  The control unit 20 controls the operation of the reception circuit unit 12 and the reproduction processing unit 14. The control unit 20 causes the reception circuit unit 12 to select a channel of a broadcast station (also referred to as a designated broadcast station) designated by the user so that broadcast contents received on the channel of the designated broadcast station can be reproduced. The control unit 20 searches and specifies in advance the affiliated stations and relay stations corresponding to the designated broadcast station so that smooth switching can be performed even when the broadcast area is switched due to the movement of the mounted vehicle. . When the broadcast area is switched, the channel being viewed is seamlessly displayed by automatically switching to a broadcast station having a higher reception sensitivity.

  Here, the relay station refers to a broadcast station that receives and amplifies the radio wave of the parent broadcast station and broadcasts it. The relay station may output radio waves of the same broadcast content to the same physical channel (frequency band) as the parent broadcast station, or may output radio waves of the same broadcast content to different physical channels. On the other hand, an affiliated station refers to a local broadcasting station belonging to the same network series as any of the main broadcasting stations (key stations). The affiliated stations use the same physical channel or a different physical channel as the main broadcast station, and output radio waves of unique broadcast contents for each broadcast content common to the main broadcast station and the affiliated stations according to the broadcast time zone.

  In terrestrial digital broadcasting in Japan, physical channels of 13 ch to 52 ch are used. Since the combination of specific physical channels to be used differs depending on the broadcast area, in order to receive the broadcast content of a specific broadcast station, it is necessary to appropriately select the physical channel to be selected according to the broadcast area. The broadcast signal transmitted from the parent broadcast station may include relay station list information indicating a list of physical channels of relay stations corresponding to the local station, and should be searched by acquiring the relay station list. Candidate channels of relay stations can be narrowed down. Further, the TS signal to be demodulated from the broadcast signal includes identification information (for example, TSID) for specifying the broadcasting station, and the broadcasting station can be specified by referring to the identification information. Since the parent broadcast station and its relay station are given a common TSID, the channel of the relay station corresponding to the designated broadcast station can be specified in advance by searching for a physical channel with a matching TSID. In the case of an affiliated station, different TSIDs are assigned. In this case, it is possible to identify in advance the channel information of the affiliated stations corresponding to the designated broadcast station by holding in advance table information of TSID which defines the series relationship of each broadcast station and referring to the held table information. By comparing the TSIDs in this manner, it is possible to identify the channel of the relay station or affiliated station whose broadcast content is common.

  The control unit 20 operates the reception circuit unit 12 in the operation state of the first state or the second state. In the first state, at least one of the plurality of reception units 21 to 26 is tuned to the channel of the designated broadcast station designated by the user, and at least one of the plurality of reception units 21 to 26 corresponds to the designated broadcast station The candidate channel of any one of the relay stations is fixedly searched, and at least one of the plurality of receivers 21 to 26 is cyclically searched for one or more candidate channels of the relay station corresponding to the designated broadcasting station. For example, the designated broadcast station is selected to the A system, and any candidate channel of the relay station is continuously searched (fixed search) to the B system, and one or more candidate channels of the relay station are cyclically searched to the C system. Let

  On the other hand, in the second state, the channel of the designated broadcasting station is selected as the number of receiving parts having a number larger than the number of receiving parts for selecting the channel of the designated broadcasting station in the first state among the plurality of receiving parts 21 to 26. And at least one of the remaining receiving units make a cyclic search of one or more candidate channels of the relay station corresponding to the designated broadcasting station. For example, the channel of the designated broadcast station is tuned to both the A channel and the B channel, and one or more candidate channels of the relay station corresponding to the designated broadcast station are cyclically searched to the C channel.

  The control unit 20 specifies a channel of a relay station or affiliated station corresponding to the designated broadcasting station from the demodulated TS signal. For example, the control unit 20 acquires the relay station list of the designated broadcast station from the TS signal demodulated in the A system, and sets the physical channel included in the relay station list as a candidate channel of the relay station. The control unit 20 causes the C channel to sequentially search the physical channels included in the relay station list, and specifies a channel of a receivable relay station. The control unit 20 may hold in advance table information in which the series relationship of each broadcasting station is determined, and may specify the candidate channel of the corresponding relay station or affiliated station with reference to the held table information.

  The control unit 20 acquires information on the reception sensitivity of the receivable channel from the reception circuit unit 12. For example, the control unit 20 acquires the reception sensitivity of the channel of the designated broadcast station received by the A system and the reception sensitivity of the candidate channel of the relay station or the affiliated station received by the B system or the C system. If the acquired reception sensitivity is equal to or higher than a predetermined reference value, the control unit 20 determines that the reception can be performed, and if the acquired reception sensitivity is less than the predetermined reference value, the control can not be received. judge. The reception sensitivity of the broadcast signal is determined, for example, based on the value of the carrier-to-noise ratio (C / N ratio) of the broadcast signal.

  The control unit 20 causes the storage unit 30 to hold search results of candidate channels of relay stations and affiliated stations. The control unit 20 registers the physical channel included in the relay station list in the storage unit 30 as a "candidate channel". Among the candidate channels, the control unit 20 registers a channel whose reception sensitivity is confirmed to be equal to or higher than the reference value by the search in the storage unit 30 as a “receivable channel”. Among the receivable channels, the control unit 20 registers a channel whose broadcast content is common to the designated broadcasting station in the storage unit 30 as a “substitutable channel”. Whether or not the channel corresponds to the alternative channel is determined based on whether or not the TSID of the currently viewed channel matches or corresponds to the TSID of the searched channel. The storage unit 30 may hold together the value of the reception sensitivity (for example, the C / N ratio value) of each channel as one of the search results.

  The control unit 20 operates the reception circuit unit 12 in the first state if the designated broadcasting station can receive and the “substitutable channel” is registered in the storage unit 30. Specifically, the channel A is tuned to the channel being viewed, the channel B is fixedly searched for the alternative channel, and the channel C is cyclically searched for the candidate channel. Thus, in the first state, it is possible to simultaneously measure the reception sensitivities of both the viewing channel and the receivable channel. Furthermore, based on the reception sensitivities of a plurality of channels simultaneously measured, the control unit 20 enters a place where broadcast radio waves such as tunnels and underground facilities do not reach and whether the vehicle is in a "reception impossible state" or not. To judge.

  When the reception sensitivities of the two channels simultaneously measured in the A system and the B system become less than the reference value at the same timing, the control unit 20 determines that the above-mentioned "reception impossible state" has been made. If the radio wave intensities of the plurality of channels decrease in the same manner, it is considered that there is a high possibility that the vehicle has moved to a place where radio waves can not be received. The control unit 20 performs “reception when the first timing when the reception sensitivity of the channel A channel is less than the reference value and the second timing when the reception sensitivity of the channel B channel is less than the reference value satisfy a predetermined relationship. It may be determined that the state is "impossible". For example, if the time difference between the first timing and the second timing is within a predetermined value (for example, 0.1 seconds, 0.5 seconds, 1 second, 5 seconds), it may be determined that the "reception disabled state" has been reached. Good. On the other hand, when the time difference between the first timing and the second timing exceeds the predetermined value, it is determined that the "non-receivable state" is not maintained, and the previous operation state is maintained.

  The control unit 20 shifts the operation of the reception circuit unit 12 from the first state to the second state when it determines that the “reception disabled state” has been reached in the first state. Specifically, the fixed search of the receivable channel by the B system is stopped, and both the A system and the B system are tuned to the currently viewed channel. In the case of the unreceivable state, even if the channel is automatically switched, the channel after switching can not be viewed either, so there is no merit of channel switching. In addition, when it is recovered from the tunnel or underground facility and restored to the viewable state, it is considered that there is a high possibility that the reception sensitivity of the designated broadcasting station is good as in the situation immediately before the view becomes impossible. In this case, when the channel being viewed is automatically switched to the channel of the relay station or affiliated station, the designated broadcast station must be re-selected after being able to receive, and the state of the viewing channel being restored is restored. It takes a long time to do it. Therefore, in the present embodiment, when the reception is not possible, the original channel is continuously tuned without automatically switching the channel. By this, it is possible to reproduce the broadcast content of the channel being selected from the timing when the reception becomes possible. Furthermore, by tuning the currently viewed channel to both the A system and the B system and enhancing the reception sensitivity, it is possible to shorten the time from the recovery of the reception state to the return to the viewable state. Also in the second state, the C system continuously searches for a candidate channel of the relay station.

  In the second state, when the reception state of the currently viewed channel becomes equal to or higher than the reference value and the reception becomes possible in the second state, the control unit 20 cancels the "reception impossible state" and shifts from the second state to the first state. Resume playback of the medium channel. On the other hand, if the reception sensitivity of the alternative searchable channel being cyclically searched in the C system becomes equal to or higher than the reference value while reception is not possible in the second state while receiving a channel being viewed, the “reception not possible state” is canceled Change the station to the alternative channel, and tune both the A system and the B system to the alternative channel. As a result, when it is considered that the user has passed through a tunnel or the like and entered a different broadcast area, the channel can be automatically switched to an alternative channel in which the broadcast content is common, and the reproduction of the same broadcast content can be resumed.

  FIG. 2 is a flow chart schematically showing the flow of the broadcast receiving method. The broadcast receiving apparatus 10 selects a broadcast station designated by the user in both A and B systems (S10), reproduces the received broadcast content, and acquires a relay station list (S12). If the reception sensitivity of the designated broadcasting station is equal to or higher than the reference value and can be received (Y in S14) and the substitutable channel is registered (Y in S16), the designated broadcasting station is tuned to the A system, The alternative channel is fixedly searched in the system (S18). If no substitutable channel is registered (N in S16), S18 is skipped, and tuning of the designated broadcasting station in the A system and the B system is continued. Subsequently, the candidate channel of the relay station is cyclically searched in the C system (S20), and the reception sensitivity of the search target is equal to or higher than the reference value and can be received (Y in S22). If the channel is common to the channel (Y in S24), the channel is registered in the storage unit 30 as a substitutable channel (S26). If the reception sensitivity of the search target is less than the reference value and reception is not possible (N of S22), the processing of S24 to S26 is skipped. If the broadcast content of the search target is not in common with the currently viewed channel (N in S24), the processing in S26 is skipped. If the situation in which the channel being viewed can be received continues (Y in S14), the processing in S16 to S26 is repeatedly performed on one or more candidate channels included in the relay station list. As a result, the information on the “substitutable channel” corresponding to the currently viewed channel is kept up-to-date.

  When the reception sensitivity of the designated broadcasting station in the A system falls below the reference value and reception becomes impossible (N in S14), and the reception sensitivity of the alternative channel in the B system falls below the reference value and the reception becomes impossible The first timing when the reception sensitivity in the A system is less than the reference value and the second timing when the reception sensitivity in the B system is less than the reference value are compared (S32). If the time difference between the first timing and the second timing is within the predetermined value (Y in S32), it is determined that the reception is not possible, and the designated broadcasting station is tuned to both the A system and the B system and the second state (S34), and the candidate channel of the relay station is cyclically searched in the C system (S36). When the designated broadcasting station can receive the data in the A system and the B system (Y in S38), the unreceivable state is canceled and the processes in S14 to S26 are executed. If the designated broadcasting station can not receive in the A system and B system (N in S38) and the substitutable channel can not be received in the C system (N in S40), the processes in S36 to S40 are repeated. On the other hand, if the alternative channel can be received by system C (Y at S40), the designated broadcasting station is changed to the alternative channel (S42), and it is possible to return to the beginning of the flow and substitute by system A and B The channel is selected as a designated broadcast station (S10). In S30, when the alternative channel can be received by the B system (Y in S30), the designated broadcasting station is changed to the alternative channel (S42), and the flow is returned to the beginning and the alternative by the A system and the B system. A possible channel is selected as a designated broadcast station (S10). In S32, when the time difference between the first timing and the second timing exceeds the predetermined value (N in S32), the process returns to S14.

  According to the present embodiment, when the reception sensitivities of the different channels received by the A system and the B system simultaneously decrease, it is determined that the reception is not possible, thereby entering the tunnel, the underground facility, etc. and all the broadcasts. It can be more accurately determined that the radio wave can not be received. In addition, when it becomes unreceivable, transition to the second state where channel A is tuned to the same channel for both system A and system B, thereby enhancing the radio wave reception sensitivity when trying to get out of a tunnel or underground facility. , You can resume playing the broadcast contents of the viewing channel earlier. As a result, the time during which the broadcast content is interrupted due to the change in the reception state can be shortened as much as possible, and the convenience of the user can be improved.

  As mentioned above, although the present invention was explained with reference to the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment, but what was suitably combined and replaced with composition shown in each display example. Are also included in the present invention.

  In the above-mentioned embodiment, the case where the alternative possible channel is continuously tuned to the B system in the first state has been shown. In a modification, the B channel in the first state may be continuously tuned to a receivable channel other than the alternative channel. Even in this case, it is possible to detect that the reception sensitivities of the plurality of receivable channels have simultaneously decreased to determine whether or not the reception is not possible.

  In the above-mentioned embodiment, the case where three reception systems A to C are realized using six reception units is shown. In a modification, three or more reception systems A to C may be realized using five or less or seven or more reception units. For example, while using four receiving units, two receiving units may be assigned to the A system, and one receiving unit may be assigned to each of the B system and the C system. In addition, one receiving unit may be assigned to the A system and the B system, and two receiving units may be assigned to the C system.

  In the above embodiment, the broadcast receiving apparatus 10 for receiving terrestrial digital broadcast has been described. In the modification, the above-described content may be applied to a broadcast receiving apparatus for receiving broadcasts other than terrestrial digital broadcasts. For example, in the broadcast receiving apparatus for receiving a radio broadcast, the above-mentioned automatic switching to the relay station or affiliated station, or a stepwise search processing method may be applied.

  DESCRIPTION OF SYMBOLS 10 ... Broadcast receiving apparatus, 12 ... Reception circuit part, 14 ... Reproduction processing part, 16 ... Video processing part, 18 ... Audio processing part, 20 ... Control part, 21 ... 1st receiving part, 22 ... 2nd receiving part, 23 ... third reception unit, 24 ... fourth reception unit, 25 ... fifth reception unit, 26 ... sixth reception unit, 30 ... storage unit, 31 ... first demodulation unit, 32 ... second demodulation unit, 33 ... third Demodulation unit, 40: display device, 42: speaker, 44: input device.

Claims (8)

A plurality of receivers for receiving a broadcast signal;
A control unit that controls a channel to be tuned to the plurality of receiving units;
A reproduction processing unit for reproducing the broadcast content received by the channel being selected;
As the operation of the plurality of receiving units,
a) At least one of the plurality of receiving units is tuned to a channel of a designated broadcasting station designated by the user, and at least one of the plurality of receiving units is any one of relay stations corresponding to the designated broadcasting station A first state in which one candidate channel is fixedly searched, and at least one of the plurality of receiving units is cyclically searched for one or more candidate channels of a relay station corresponding to a designated broadcasting station;
b) The number of receiving units of two or more receiving units among the plurality of receiving units, the number of receiving units being greater than the number of receiving units for tuning the channel of the designated broadcasting station in the first state; There is a second state in which the channel is tuned and the remaining at least one receiving unit makes a cyclic search of one or more candidate channels of the relay station corresponding to the designated broadcasting station.
The control unit causes the transition from the first state to the second state when both of the reception sensitivity of the channel currently selected in the first state and the reception sensitivity of the channel in the fixed search are lower than a reference value. A broadcast receiver characterized in that.   The control unit is configured such that the reception sensitivity of the channel being selected in the first state falls below a reference value at the first timing, and the reception sensitivity of the channel under fixed search in the first state falls below the reference value The broadcast receiving apparatus according to claim 1, wherein when the time difference from the second timing to be decreased is within a predetermined value, the first state is shifted to the second state.   The control unit is configured such that the reception sensitivity of the channel being selected in the first state falls below a reference value at the first timing, and the reception sensitivity of the channel under fixed search in the first state falls below the reference value 3. The broadcast receiving apparatus according to claim 2, wherein the first state is maintained when the time difference from the second timing to be decreased exceeds the predetermined value.   The control unit may shift from the second state to the first state when the reception sensitivity of the channel being selected in the second state recovers to a reference value or more. The broadcast receiving device according to any one of the above.   When the control sensitivity of the channel of the designated broadcast station being selected in the second state is less than the reference value while at least one of the reception sensitivities of the channel in cyclic search is recovered to the reference value or more 5. The broadcast receiving apparatus according to any one of claims 1 to 4, wherein a channel of a relay station in which the reception sensitivity common to the designated broadcast station and the broadcast content is recovered to a reference value or more is selected.   When the control sensitivity of the channel of the designated broadcast station being selected in the second state is less than the reference value while at least one of the reception sensitivities of the channel in cyclic search is recovered to the reference value or more If the channel of the relay station having the same broadcast content as the designated broadcasting station is selected while maintaining the second state, and the reception sensitivity of the channel being selected in the second state recovers to the reference value or more, The broadcast receiving apparatus according to any one of claims 1 to 4, wherein transition from the second state to the first state is made. A channel of a designated broadcasting station designated by the user is selected in at least one of a plurality of receiving units, and any one candidate channel of relay stations corresponding to the designated broadcasting station in another at least one of the plurality of receiving units Performing a fixed state search and performing a first state in which at least one of the plurality of receiving units is cyclically searched for one or more candidate channels of the relay station corresponding to the designated broadcasting station;
When both of the reception sensitivity of the channel being selected in the first state and the reception sensitivity of the channel in the fixed search are less than the reference value, two or more of the plurality of reception units from the first state The number of receiving units that are larger than the number of receiving units that tune the channel of the designated broadcasting station in the first state, and causes the channel of the designated broadcasting station to tune, and the remaining at least one receiving unit And D. transitioning to a second state in which one or more candidate channels of the relay station corresponding to the designated broadcast station are cyclically searched. A channel of a designated broadcasting station designated by the user is selected in at least one of a plurality of receiving units, and any one candidate channel of relay stations corresponding to the designated broadcasting station in another at least one of the plurality of receiving units Performing a first state in which at least one of the plurality of receiving units is subjected to a cyclic search for one or more candidate channels of the relay station corresponding to the designated broadcasting station.
When both of the reception sensitivity of the channel being selected in the first state and the reception sensitivity of the channel in the fixed search are less than the reference value, two or more of the plurality of reception units from the first state The number of receiving units that are larger than the number of receiving units that tune the channel of the designated broadcasting station in the first state, and causes the channel of the designated broadcasting station to tune, and the remaining at least one receiving unit A program causing a computer to realize a function of shifting to a second state in which one or more candidate channels of a relay station corresponding to a designated broadcasting station are cyclically searched.

Images