JP2021019321A - Broadcast receiver, broadcast reception method, broadcast reception control program - Google Patents

Abstract

To provide techniques for reducing a processing period while suppressing deterioration in the precision in listing broadcasting stations.SOLUTION: A first tuner 100a to a fourth tuner 100d can receive broadcast waves from broadcasting stations. A first synthesis unit 300a is connected with the first tuner 100a to fourth tuner 100d and synthesizes signals output from n/2 tuners. A first decoding unit 340a decodes the signals synthesized in the first synthesis unit 300a. A control unit 400 controls the first tuner 100a to the fourth tuner 100d, the first synthesis unit 300a and the first decoding unit 340a so as to sequentially execute: (1) first processing for determining whether a broadcast wave is present or absent; (2) second processing for calculating a synthesized CNR when the first processing has determined that a broadcast wave is present; and (3) third processing for acquiring broadcasting station information.SELECTED DRAWING: Figure 1

Description

The present invention relates to a receiving technique, and more particularly to a broadcast receiving device for receiving a broadcast wave, a broadcast receiving method, and a broadcast reception control program.

If multipath propagation is present when receiving a broadcast wave of a digital television, fading occurs in the received signal, which makes stable reception difficult. Diversity reception using a plurality of antennas is effective and practical for reception in such an environment (see, for example, Patent Document 1).

International Publication No. 11/105074

The broadcast receiving device capable of receiving the broadcast wave executes a list of broadcast stations that can be received in the vicinity of the area used by the user before starting viewing of the program included in the broadcast wave. At that time, the broadcast receiving device capable of executing diversity reception sets, for example, a channel for which the presence or absence of a broadcast wave should be confirmed in all tuners at the same time. As a result, the broadcast receiving device uses all tuners to detect the presence or absence of broadcast waves, calculate CNR (Carrier to Noise Ratio), and provide information such as TSID (Transport Stream identification) (hereinafter, "broadcast station information"). ) Is collected and processed. Further, the broadcast receiving device executes a list of broadcasting stations based on the calculated CNR and broadcasting station information after the confirmation for all channels is completed. According to such processing, since the same channel is set for all tuners, the accuracy of listing the broadcasting stations is improved, but the processing period is lengthened.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique for shortening a processing period while suppressing a decrease in accuracy of listing of broadcasting stations.

In order to solve the above problems, the broadcast receiving device of a certain aspect of the present invention includes n tuners (an even number of n> = 4) capable of receiving broadcast waves from a broadcasting station via different antennas. , A synthesizer that is connected to n tuners and synthesizes the signals output from n / 2 tuners, a decoding unit that decodes the synthesized signal in the synthesizer, and n tuners, a synthesizer, and a decoding unit. By controlling, (1) the first process for determining the presence or absence of a broadcast wave, (2) the second process for calculating the synthetic CNR when it is determined that there is a broadcast wave in the first process, ( 3) It is provided with a control unit that sequentially executes a third process for acquiring broadcast station information after calculating a synthetic CNR in the second process. At the time of (1) first processing, the control unit sets the first channel to n / 2 tuners out of n tuners, and synchronizes with at least one of n / 2 tuners. Is established, it is determined that there is a broadcast wave of the first channel, and (2) at the time of the second processing, the first channel is set to n tuners and output from n tuners. The signal is synthesized in the synthesis unit, the single CNR in each of the n tuners is calculated, the synthetic CNR of the n tuners is calculated, and (3) n / in the n tuners during the third processing. For each of the multiple types of combinations of the two tuners, the total value of the single CNRs of n / 2 tuners included in the combination is calculated, and the minimum total value of the total values that are equal to or greater than the threshold value is calculated. The first channel is set for the n / 2 tuners included in the combination corresponding to the selected total value, and the signals output from the n / 2 tuners are combined with the synthesizer. At the same time, the decoding unit is made to perform decoding, and while the first process or the third process is being executed for the first channel, the first unused n / 2 tuners are used. The first process is executed for the second channel different from the channel of.

Another aspect of the present invention is a broadcast receiving method. In this method, n tuners capable of receiving broadcast waves from a broadcasting station and signals output from n / 2 tuners connected to n tuners are combined through different antennas. By controlling the synthesizing unit, the decoding unit that decodes the signal synthesized in the synthesizing unit, and the n tuners, the synthesizing unit, and the decoding unit, (1) the first process for determining the presence or absence of a broadcast wave, (2) The second process for calculating the synthetic CNR when it is determined in the first process that there is a broadcast wave, (3) The third process for acquiring the broadcast station information after calculating the synthetic CNR in the second process. This is a broadcast receiving method in a broadcast receiving device including a control unit for sequentially executing the above, and in the first processing, n / 2 of the n tuners are set to the first channel, and n / When synchronization is established in at least one of the two tuners, the step of determining that there is a broadcast wave of the first channel and the second processing, the first channel is added to the n tuners. The step of setting and synthesizing the signals output from n tuners in the synthesizer, calculating the independent CNR of each of the n tuners, and calculating the composite CNR of n tuners, and the third process. At this time, the total value of the single CNRs of n / 2 tuners included in the combination is calculated for each of the plurality of types of combinations of n / 2 tuners in the n tuners, and the value is equal to or higher than the threshold value. Select the combination that is the smallest total value among the total values, and set the first channel to n / 2 tuners included in the combination corresponding to the selected total value, and set n / 2 tuners. Unused while performing the first process or the third process on the first channel and the step of causing the decoding unit to synthesize the signal output from the tuner and causing the decoding unit to perform decoding. It comprises a step of performing a first process on a second channel different from the first channel using n / 2 tuners.

It should be noted that any combination of the above components and the conversion of the expression of the present invention between methods, devices, systems, recording media, computer programs and the like are also effective as aspects of the present invention.

According to the present invention, the processing period can be shortened while suppressing a decrease in the accuracy of listing of broadcasting stations.

It is a figure which shows the structure of the broadcast receiving apparatus which concerns on Example. It is a flowchart which shows the processing procedure in the broadcast receiving apparatus of FIG. It is a figure which shows the data structure of the table stored in the storage part of FIG. It is a flowchart which shows the processing procedure in the broadcast receiving apparatus of FIG. It is a flowchart which shows the procedure of the 1st processing in the broadcast receiving apparatus of FIG. It is a flowchart which shows the procedure of the 3rd processing in the broadcast receiving apparatus of FIG. It is a flowchart which shows another procedure of the 3rd processing in the broadcast receiving apparatus of FIG.

Before explaining the present invention in detail, first, an outline will be given. The present embodiment relates to a broadcast receiving device having n (even number of n> = 4) tuners, for example, four tuners and capable of performing diversity reception. The broadcast receiving device is, for example, an in-vehicle device or a portable device. The broadcast receiving device lists the broadcasting stations that can be received around the area used by the user, and then starts viewing the program included in the broadcast wave. Since this embodiment relates to listing broadcasting stations, the description of viewing a program included in a broadcast wave will be omitted. As described above, the broadcast receiving device sets the same channel for all tuners (hereinafter referred to as "method 1"), and acquires broadcasting station information by diversity reception by four tuners. According to such method 1, the processing period for acquiring broadcasting station information becomes long. Further, for example, when six or more tuners are provided, the processing may be performed by dividing into two systems of three tuners. There is also a mode in which an odd number of tuners is provided, such as having five tuners and dividing into two systems of 3 tuners + 2 tuners, but in this embodiment, a mode in which four or more even numbered tuners are provided will be described.

On the other hand, in order to shorten the processing period for acquiring broadcasting station information, the 4 tuners are divided into 2 systems of 2 tuners, and different channels are set for each series (hereinafter, referred to as "method 2"). For example, the first channel is set in the first tuner and the second tuner, and the second channel is set in the third tuner and the fourth tuner. In the method 2, diversity reception by the two tuners is executed in parallel, and broadcasting station information is acquired. That is, since the tuner is divided into two sets and the processing is performed in parallel, the processing period is about half that of the method 1.

It is assumed that the list of broadcasting stations is made in a place where the reception environment is good in the area, and the vehicle is stopped so that the level of the received radio wave, for example, the time fluctuation of the CNR is small. However, if the time variation of CNR becomes large, it may not be possible to select the most suitable broadcasting station for listing. For example, CH27 and CH35 are used in the same broadcasting station, and the CNR of CH27 is basically larger than the CNR of CH35, but the CNR of CH35 becomes larger than the CNR of CH27 due to the time variation of CNR. There is. Under such circumstances, CH35 may be listed as the channel of the broadcasting station.

Even if such a time variation of the CNR occurs in one tuner, in the method 1, the influence of the time variation is reduced by receiving the diversity of the four tuners. On the other hand, in the method 2, since the diversity reception of the two tuners is executed, the influence of the time variation becomes larger than that in the method 1. Further, in the method 1, the CNR is calculated by receiving the diversity of the four tuners, but in the method 2, the CNR is calculated by receiving the diversity of the two tuners, so that the calculation accuracy of the CNR is lower than that of the method 1. For example, CH27 and CH35 are used in the same broadcasting station, and the CNR of CH27 is basically larger than the CNR of CH35, but the CNR of CH35 is larger than the CNR of CH27 due to the decrease in the calculation accuracy of CNR. May be determined. Therefore, when the method 2 is used, the processing period is shortened as compared with the method 1, but the accuracy of listing the broadcasting stations may be lowered.

From these, it is required to shorten the processing period while suppressing a decrease in the accuracy of listing of broadcasting stations. In this embodiment, the process is divided into three stages. In the first stage processing (hereinafter, referred to as “first processing”), it is determined whether or not there is a broadcast wave in a predetermined channel. In the second stage processing (hereinafter, referred to as “second processing”), when it is determined that there is a broadcast wave, the synthetic CNR by the diversity reception of the four tuners is calculated. In the third stage processing (hereinafter referred to as “third processing”), the decoding process is executed on the channel determined to have the broadcast wave to acquire the broadcasting station information. Here, in the first process and the third process, two tuners are used for one channel as in the method 2. As a result, the first process is executed for the second channel while the first process or the third process is being executed for the first channel. As a result, the processing period is shortened. Further, in the second process, as in the method 1, four tuners are used for one channel. As a result, the calculation accuracy of the synthetic CNR is improved, and the decrease in the accuracy of listing of broadcasting stations is suppressed.

FIG. 1 shows the configuration of the broadcast receiving device 1000. The broadcast receiving device 1000 includes a first tuner 100a, a second tuner 100b, a third tuner 100c, a fourth tuner 100d, and a first baseband processing unit 200a, which is collectively referred to as a baseband processing unit 200. 2 Baseband processing unit 200b, 3rd baseband processing unit 200c, 4th baseband processing unit 200d, 1st synthesis unit 300a collectively referred to as synthesis unit 300, 2nd synthesis unit 300b, and de mapping unit 310. The first de-mapping unit 310a, the second de-mapping unit 310b, the first MER calculation unit 320a, the second MER calculation unit 320b, and the synthetic CNR calculation unit 330, which are collectively referred to as the MER (Modulation Broadcast Ratio) calculation unit 320. First synthetic CNR calculation unit 330a, second synthetic CNR calculation unit 330b, first decoding unit 340a collectively referred to as decoding unit 340, second decoding unit 340b, first output unit 350a collectively referred to as output unit 350, first 2 Output unit 350b is included. The number of the tuner 100 and the baseband processing unit 200 is not limited to "4", and may be "4 or more".

The first tuner 100a includes a first antenna 110a, a first LNA (Low Noise Amplifier) 120a, a first RF (Radio Frequency) amplifier 130a, a first local oscillator 140a, a first mixer 150a, and a first IF (Intermediate Frequency) amplifier 160a. Including. The second tuner 100b includes a second antenna 110b, a second LNA 120b, a second RF amplifier 130b, a second local oscillator 140b, a second mixer 150b, and a second IF amplifier 160b. The third tuner 100c includes a third antenna 110c, a third LNA 120c, a third RF amplifier 130c, a third local oscillator 140c, a third mixer 150c, and a third IF amplifier 160c. The fourth tuner 100d includes a fourth antenna 110d, a fourth LNA 120d, a fourth RF amplifier 130d, a fourth local oscillator 140d, a fourth mixer 150d, and a fourth IF amplifier 160d.

Here, the first antenna 110a to the fourth antenna 110d are collectively referred to as the antenna 110, the first LNA 120a to the fourth LNA 120d are collectively referred to as the LNA 120, the first RF amplifier 130a to the fourth RF amplifier 130d are collectively referred to as the RF amplifier 130, and the first local unit. The antennas 140a to 4th local oscillator 140d are collectively referred to as local oscillator 140, the first mixer 150a to fourth mixer 150d are collectively referred to as mixer 150, and the first IF amplifier 160a to fourth IF amplifier 160d are collectively referred to as IF amplifier 160. Will be done.

The first baseband processing unit 200a includes a first A / D (Analog to Digital) converter 210a, a first level detector 220a, a first gain control unit 230a, a first orthogonal demodulation unit 240a, and a first FFT (Fast Fourier Transform). A unit 250a, a first frame extraction unit 260a, and a first CNR calculation unit 270a are included. The second baseband processing unit 200b includes a second A / D converter 210b, a second level detector 220b, a second gain control unit 230b, a second orthogonal demodulation unit 240b, a second FFT unit 250b, and a second frame extraction unit 260b. The second CNR calculation unit 270b is included. The third baseband processing unit 200c includes a third A / D converter 210c, a third level detector 220c, a third gain control unit 230c, a third orthogonal demodulation unit 240c, a third FFT unit 250c, and a third frame extraction unit 260c. The third CNR calculation unit 270c is included. The fourth baseband processing unit 200d includes a fourth A / D converter 210d, a fourth level detector 220d, a fourth gain control unit 230d, a fourth orthogonal demodulation unit 240d, a fourth FFT unit 250d, and a fourth frame extraction unit 260d. The fourth CNR calculation unit 270d is included.

The first A / D converter 210a to the fourth A / D converter 210d are collectively referred to as the A / D converter 210, and the first level detector 220a to the fourth level detector 220d are collectively referred to as the level detector 220. The gain control unit 230a to the fourth gain control unit 230d are collectively referred to as the gain control unit 230, the first orthogonal demodulation unit 240a to the fourth orthogonal demodulation unit 240d are collectively referred to as the orthogonal demodulation unit 240, and the first FFT unit 250a to the fourth FFT unit. The 250d is generically referred to as the FFT unit 250, the first frame extraction unit 260a to the fourth frame extraction unit 260d are collectively referred to as the frame extraction unit 260, and the first CNR calculation unit 270a to the fourth CNR calculation unit 270d are collectively referred to as the CNR calculation unit 270. To.

The broadcast receiving device 1000 is a device for receiving broadcast waves of television broadcasting, for example, terrestrial digital television broadcasting. Here, a plurality of channels arranged at different frequencies are defined, and each broadcasting station broadcasts a broadcast wave on the permitted channel. The first tuner 100a can receive broadcast waves from a broadcasting station (not shown) via the first antenna 110a. The first LNA 120a amplifies the broadcast wave (hereinafter, referred to as “received signal”) received by the first antenna 110a. Here, the received signal is an RF signal. The first RF amplifier 130a amplifies the received signal amplified in the first LNA 120a (hereinafter, also referred to as “received signal”). The amplification factor in the first RF amplifier 130a changes depending on the RF amplification factor control signal from the first gain control unit 230a.

The first local oscillator 140a outputs a local oscillation signal having a frequency corresponding to the frequency of the channel to be received. The first mixer 150a performs down-conversion on the received signal (hereinafter, also referred to as “received signal”) amplified by the first RF amplifier 130a by the local oscillation signal from the first local oscillator 140a. As a result of down conversion, the RF signal is converted into an IF signal. The first IF amplifier 160a amplifies the received signal converted into the IF signal in the first mixer 150a (hereinafter, also referred to as “received signal”). The amplification factor in the first IF amplifier 160a changes depending on the IF amplification factor control signal from the first gain control unit 230a.

The first A / D converter 210a executes conversion from an analog signal to a digital signal with respect to the received signal amplified by the first IF amplifier 160a. The first level detector 220a detects the level of the received signal (hereinafter, also referred to as “received signal”) converted into a digital signal by the first A / D converter 210a. Based on the level detected by the first level detector 220a, the first gain control unit 230a sets the amplification factor of the first LNA 120a so that the level of the received signal from the first A / D converter 210a approaches the target value. The amplification factor of the first IF amplifier 160a is controlled. The first gain control unit 230a outputs the amplification factor of the first LNA 120a as an RF amplification factor control signal to the first RF amplifier 130a, and outputs the amplification factor of the first IF amplifier 160a to the first IF amplifier 160a as an IF amplification factor control signal.

The first orthogonal demodulation unit 240a converts the IF signal into a baseband signal by performing orthogonal demodulation on the received signal from the first A / D converter 210a. The received signal of the baseband signal (hereinafter, also referred to as “received signal”) has an I component and a Q component. The first FFT unit 250a converts the time domain signal into the frequency domain signal by executing the FFT on the received signal from the first orthogonal demodulation unit 240a. The first FFT unit 250a uses the reception signal (hereinafter, also referred to as “received signal”) which is a signal in the frequency domain as the first frame extraction unit 260a, the first CNR calculation unit 270a, the first synthesis unit 300a, and the second synthesis unit. It can be output to 300b.

The first frame extraction unit 260a extracts a frame synchronization signal among TMCC (Transmission and Multiplexing Configuration and Control) signals from the reception signal from the first FFT unit 250a. Successful extraction of the frame synchronization signal corresponds to establishment of frame synchronization, and failure to extract the frame synchronization signal corresponds to failure to establish frame synchronization. The first CNR calculation unit 270a calculates, for example, the ratio of the power density of the subcarrier to the noise power density in the region without the subcarrier as a CNR from the received signal from the first FFT unit 250a. It can be said that this CNR is a single CNR in the first tuner 100a or the first baseband processing unit 200a. The CNR may be calculated as appropriate using a known method.

The second tuner 100b to the fourth tuner 100d execute the same processing as the first tuner 100a, and the second baseband processing unit 200b to the fourth baseband processing unit 200d are the same as the first baseband processing unit 200a. Execute the process. Therefore, it can be said that the n tuners 100 can receive broadcast waves from the broadcasting station via different antennas 110.

The first synthesis unit 300a is connected from the first baseband processing unit 200a to the fourth baseband processing unit 200d. The first synthesis unit 300a selects two of the first baseband processing unit 200a to the fourth baseband processing unit 200d in response to an instruction from the control unit 400, and the two selected baseband processing units 200 Synthesize the received signal from. At that time, weighting is performed by a single CNR in the selected baseband processing unit 200. Here, it is assumed that the first baseband processing unit 200a and the second baseband processing unit 200b are selected. The first synthesis unit 300a weights the received signal from the first baseband processing unit 200a by the independent CNR in the first baseband processing unit 200a, and the second baseband by the independent CNR in the second baseband processing unit 200b. The received signal from the processing unit 200b is weighted. The first synthesis unit 300a synthesizes these weighted received signals. In response to the instruction from the control unit 400, the first baseband processing unit 200a may instruct the fourth baseband processing unit 200d.

The first de mapping unit 310a determines the data included in the broadcast wave from the received signal (hereinafter, also referred to as “received signal”) synthesized by the first combining unit 300a. The first MER calculation unit 320a calculates the MER from the result of de-mapping in the first de-mapping unit 310a. The first synthetic CNR calculation unit 330a converts the MER calculated by the first MER calculation unit 320a into an equivalent CNR. For example, the first synthetic CNR calculation unit 330a holds a conversion table of MER and CNR in advance, and calculates CNR from MER by referring to the conversion table. This CNR corresponds to a synthetic CNR which is a CNR when diversity is received. The first decoding unit 340a decodes the result of de-mapping in the first de-mapping unit 310a. This corresponds to decoding the received signal synthesized by the first synthesis unit 300a. At that time, error correction processing may be performed. The first output unit 350a outputs the data decoded by the first decoding unit 340a as a TS signal or broadcasting station information.

The second synthesis unit 300b to the second output unit 350b execute the same processing as the first synthesis unit 300a to the first output unit 350a. In this embodiment, the first synthesis unit 300a to the first output unit 350a may be omitted, and thus the description thereof will be omitted here.

The control unit 400 controls the operation of the broadcast receiving device 1000. For example, the control unit 400 controls four tuners 100, four baseband processing units 200, a synthesis unit 300, a decoding unit 340, and the like. For this control, the control unit 400 is connected from the tuner 100 to any component of the output unit 350. FIG. 2 is a flowchart showing a processing procedure in the broadcast receiving device 1000. This indicates processing for one channel. The control unit 400 causes the tuner 100 and the baseband processing unit 200 to execute the first process for determining the presence or absence of broadcast waves (S10). When it is determined by the first processing that there is a broadcast wave (Y in S12), the control unit 400 includes the tuner 100, the baseband processing unit 200, the synthesis unit 300, the de-mapping unit 310, the MER calculation unit 320, and the synthesis CNR calculation unit. The 330 is made to execute the second process for calculating the synthetic CNR (S14). After calculating the synthetic CNR in the second processing, the control unit 400 acquires the broadcasting station information to the tuner 100, the baseband processing unit 200, the synthesis unit 300, the de mapping unit 310, the decoding unit 340, and the output unit 350. The third process of (S16) is executed. When it is determined by the first process that there is no broadcast wave (N in S12), steps 14 and 16 are skipped, and the process for one channel is completed. Return to FIG.

Hereinafter, the processes in the control unit 400 will be described in the order of (1) first process, (2) second process, and (3) third process.
(1) First Process The control unit 400 selects two tuners 100 out of the four tuners 100 and causes the first process to be executed. In order to select the two tuners 100, the control unit 400 executes one of (A) pattern 1-1 to (F) pattern 1-6.

(A) Pattern 1-1
Pattern 1-1 is executed when the first process is first executed, that is, in a situation where the broadcasting stations are not listed. In the pattern 1-1, the control unit 400 sets a channel to be processed (hereinafter, referred to as “first channel”) in two predetermined tuners 100 out of the four tuners 100. For example, the control unit 400 sets CH13 as the first channel in the first tuner 100a and the second tuner 100b. The first tuner 100a and the first baseband processing unit 200a, and the second tuner 100b and the second baseband processing unit 200b execute the above-described processing.

The control unit 400 receives a result regarding whether or not frame synchronization has been established from the first frame extraction unit 260a and the second frame extraction unit 260b. The control unit 400 determines that there is a broadcast wave of the first channel when synchronization is established in at least one of the first frame extraction unit 260a and the second frame extraction unit 260b. Following this, the control unit 400 executes the second process. On the other hand, the control unit 400 determines that there is no broadcast wave of the first channel when synchronization is not established in either the first frame extraction unit 260a and the second frame extraction unit 260b. Further, the control unit 400 determines that the status is "reconfirmation required" because the third tuner 100c and the fourth tuner 100d are unused. The reconfirmation required indicates that the first process needs to be performed again because it is determined that there is no broadcast wave in the first first process.

The control unit 400 stores the result of such processing in the storage unit 500. FIG. 3 shows the data structure of the table stored in the storage unit 500. This table shows the history of past processing. FIG. 3 is an example of a table showing the processing history at the time when the first first processing is executed from CH13 to CH18 and the first first processing is not executed in CH19. "Status" indicates whether it is unconfirmed, reconfirmed, confirmed, or confirmed. Unconfirmed indicates that the first first process has not been executed. The reconfirmation required is as described above, and the presence / absence confirmation and confirmation will be described later. “Yes” or “No” is indicated in the “broadcast wave presence / absence determination result”. Yes indicates that there is a broadcast wave, that is, frame synchronization has been established, and none indicates that there is no broadcast wave. The "first tuner" to the "fourth tuner" are indicated as used or unused. Use indicates the case where the tuner 100 is used, and unused indicates the case where the tuner 100 is not used. At the end of pattern 1-1, the "1st tuner" column and the "2nd tuner" column are indicated as "use (1)", and the "3rd tuner" column and the "4th tuner" column are displayed. Is shown as "unused". Here, (1) indicates that the tuner was used in the first first process. Other items will be described later. Return to FIG.

(B) Pattern 1-2
Pattern 1-2 is executed to reconfirm the presence or absence of broadcast waves on a channel in which four tuners 100 are available and the status is "reconfirmation required". In the channel whose status is "reconfirmation required", the first processing is performed for the first time, so pattern 1-2 corresponds to the case where the first processing for the second time is executed. The control unit 400 derives the number of times the combination of the two tuners 100 used when it is determined that there is no broadcast wave in the first first process already executed is used for each combination. In the case of FIG. 3, the control unit 400 targets CH14, CH15, and CH17 as channels whose status is “reconfirmation required”. Here, the third tuner 100c and the fourth tuner 100d are used for CH14 and CH17, and the first tuner 100a and the second tuner 100b are used for CH15. As a result, the number of times the third tuner 100c and the fourth tuner 100d are used is "2", and the number of times the first tuner 100a and the second tuner 100b are used is "1".

Further, the control unit 400 selects two tuners 100 other than the two tuners 100 included in the combination that will be used most frequently for use in the first process. In the case of the above example, since the combination that is used most frequently is the third tuner 100c and the fourth tuner 100d, the control unit 400 selects the first tuner 100a and the second tuner 100b. Further, the control unit 400 extracts, for example, CH14 as the first channel to be processed from the channels CH14 and CH17 that have not been subjected to the first processing by the selected first tuner 100a and the second tuner 100b. Since the processing following this is the same as that of pattern 1-1, the description thereof will be omitted here, but when the control unit 400 determines that there is no broadcast wave of the first channel, the table stored in the storage unit 500 Among them, the status for the first channel is updated to "confirmed". When the control unit 400 determines that there is a broadcast wave of the first channel, the status for the first channel in the table stored in the storage unit 500 is updated to "presence / absence confirmation". In other words, when the status is "presence / absence confirmed", it is determined that "there is a broadcast wave", but the third process is not performed, which is a transitional state. Further, the first tuner and the second tuner for the first channel are changed to "use (2)". Here, (2) indicates that the tuner was used in the second first processing.

(C) Pattern 1-3
Patterns 1-3 are cases where four tuners 100 can be used, there is no channel whose status is "reconfirmation required", and there is a channel determined to have "broadcast wave" by the first first process. Is executed. This is executed for the channel that has not executed the first first process. The control unit 400 derives the number of times the combination of the two tuners 100 used in the channel determined to have "broadcast wave" by the first first process is used for each combination. In the case of FIG. 3, the control unit 400 targets CH16 and CH18 as channels determined to have “broadcast waves”. Here, the first tuner 100a and the second tuner 100b are used for CH16. Further, CH18 is determined to have "broadcast waves" by the second first processing, and at that time, the first tuner 100a and the second tuner 100b are used. As a result, the number of times the first tuner 100a and the second tuner 100b are used becomes "2".

Further, the control unit 400 selects two tuners 100 included in the combination having the largest number of uses for use in the first process. In the case of the above example, since the combination that is used most frequently is the first tuner 100a and the second tuner 100b, the control unit 400 selects the first tuner 100a and the second tuner 100b. Since the processing following this is the same as that of pattern 1-1, the description thereof will be omitted here.

(D) Pattern 1-4
Patterns 1-4 are executed to reconfirm the presence or absence of broadcast waves on a channel in which two tuners 100 are available and the status is "reconfirmation required". This presupposes a situation in which two tuners other than the two available tuners 100 are used in the first or third process for other channels. Further, in the channel whose status is "reconfirmation required", the first processing is performed for the first time, so that the pattern 1-4 corresponds to the case where the first processing for the second time is executed. The control unit 400 extracts the channels whose status is "reconfirmation required", in which two tuners 100 other than the two usable tuners 100 are used in the first first processing, as the first channel. To do. In the case of FIG. 3, the control unit 400 targets CH14, CH15, and CH17 as channels whose status is “reconfirmation required”. Here, when the first tuner 100a and the second tuner 100b can be used, the control unit 400 uses, for example, among CH14 and CH17 in which the third tuner 100c and the fourth tuner 100d are used in the first first processing. CH14 is extracted as the first channel.

Since the processing following this is the same as that of pattern 1-1, the description thereof will be omitted here, but when the control unit 400 determines that there is no broadcast wave of the first channel, the table stored in the storage unit 500 Among them, the status for the first channel is updated to "presence / absence confirmed".

(E) Pattern 1-5
In pattern 1-5, two tuners 100, such as the first tuner 100a and the second tuner 100b, can be used, but the two tuners 100 are the second second for the channel whose status is "reconfirmation required". This is executed when the two tuners 100 should not be used in one process. Therefore, the pattern 1-5 executes the first first process for the unexecuted channel, for example, CH19 shown in FIG. The control unit 400 uses two available tuners 100.

(F) Pattern 1-6
Pattern 1-6 is executed when there is no unexecuted channel in the first first process in pattern 1-5. In this case, since there is no tuner 100 to be used for the first process, the control unit 400 shifts to the standby state.

(2) Second processing The control unit 400 sets the four tuners 100 for the first channel determined to have a broadcast wave in the first processing. Further, the control unit 400 causes the first synthesis unit 300a to synthesize the reception signals output from the four baseband processing units 200, and calculates the synthesis CNR of the reception signal synthesized by the first synthesis unit 300a as the first synthesis CNR. Let unit 330a calculate. Further, the control unit 400 causes each of the first CNR calculation unit 270a to the fourth CNR calculation unit 270d to calculate a single CNR. The control unit 400 stores the calculated synthetic CNR and single CNR in the table of the storage unit 500. FIG. 3 shows a synthetic CNR for CH16 determined to have a broadcast wave in the first process, and a CNR of the first tuner alone to a CNR of the fourth tuner alone. Here, the 1st tuner single CNR to the 4th tuner single CNR correspond to the single CNR calculated by the 4th CNR calculation unit 270d from the single CNR calculated by the 1st CNR calculation unit 270a. Return to FIG.

(3) Third Process As the third process, the control unit 400 sets the first channel to the two tuners 100 selected based on the single CNR in each of the four tuners 100. Further, the control unit 400 causes the first synthesis unit 300a to synthesize the received signals output from the two tuners 100, and causes the first decoding unit 340a to perform decoding. In order to select the two tuners 100, the control unit 400 executes (a) pattern 3-1 or (e) pattern 3-5. Further, (b) pattern 3-2 to (d) pattern 3-4 are executed in combination with (a) pattern 3-1 or (e) pattern 3-5.

(A) Pattern 3-1
Pattern 3-1 executes the third process for the first channel, but when there is another channel whose status is determined to be "reconfirmation required" by the first first process, the other channel. It is executed to give priority to reconfirmation of the presence or absence of broadcast waves in. In such a situation, two tuners 100 (hereinafter referred to as "candidate tuners 100") other than the two tuners 100 that should be used for reconfirming the presence or absence of broadcast waves in other channels are used for the third process. Is preferable. However, if the decoding in the third process using the candidate tuner 100 fails, it is not desirable to use the candidate tuner 100 in the third process. Therefore, the control unit 400 first determines whether or not the tuner 100, which is a candidate for use, can be used for the third process.

Specifically, the control unit 400 is a combination of two tuners 100 used when it is determined that there is no broadcast wave in the first first processing when there is another channel whose status needs to be reconfirmed. The number of times of use is derived for each combination. In the case of FIG. 3, the control unit 400 targets CH14, CH15, and CH17 as channels whose status is “reconfirmation required”. Here, the third tuner 100c and the fourth tuner 100d are used for CH14 and CH17, and the first tuner 100a and the second tuner 100b are used for CH15. As a result, the number of times the third tuner 100c and the fourth tuner 100d are used is "2", and the number of times the first tuner 100a and the second tuner 100b are used is "1".

In addition, the control unit 400 identifies two tuners 100 included in the combination that is used most frequently. In the case of the above example, the number of times the combination of the third tuner 100c and the fourth tuner 100d is used is "2", which is the largest number, so that the third tuner 100c and the fourth tuner 100d are selected. When making CH14 and CH17 reconfirm the presence or absence of broadcast waves, the first tuner 100a and the second tuner 100b should be used. Therefore, the candidate tuners 100 are the third tuner 100c and the fourth tuner 100d. Equivalent to. The control unit 400 calculates the total value of the single CNRs of the two identified tuners 100. In the case of the above example, the total value of the single CNR of the third tuner 100c and the single CNR of the fourth tuner 100d is calculated. For the calculation of the total value, for example, the addition of the true value of each individual CNR is used. If the total value is equal to or greater than the first threshold value, the control unit 400 determines that the two tuners 100 are used for the third process. The first threshold value is a value determined by adding a margin, for example, 3 dB, to the minimum CNR that can be decoded by the first decoding unit 340a. Following this, the control unit 400 causes the first synthesis unit 300a to synthesize the received signal output from the baseband processing unit 200 connected to each of the two tuners 100 that have been determined to be used. Further, the control unit 400 acquires the broadcasting station information output from the first output unit 350a by causing the first decoding unit 340a to perform decoding. Further, when the control unit 400 acquires the broadcasting station information, the control unit 400 sets the status for the first channel in the table stored in the storage unit 500 to "confirmed" and the broadcast wave presence / absence determination result to "yes". Update each.

(B) Pattern 3-2
Pattern 3-2 is executed when the total value of the single CNRs of the two tuners 100 identified in pattern 3-1 is smaller than the first threshold value. When the total value is smaller than the first threshold value, the control unit 400 reidentifies the two tuners 100 included in the combination having the next highest number of uses. In the case of the above example, the first tuner 100a and the second tuner 100b are selected. This corresponds to having CH15 reconfirm the presence or absence of broadcast waves instead of having CH14 and CH17 reconfirm the presence or absence of broadcast waves. The control unit 400 calculates the total value of the single CNRs of the two tuners 100 specified again. In the case of the above example, the total value of the single CNR of the first tuner 100a and the single CNR of the second tuner 100b is calculated. If the total value is equal to or greater than the first threshold value, the control unit 400 determines that the two tuners 100 are used for the third process. Since the processing following this is the same as that of pattern 3-1, the description thereof is omitted here.

(C) Pattern 3-3
Pattern 3-3 is executed when the total value of the single CNRs of the two tuners 100 specified in pattern 3-2 is smaller than the first threshold value. This is the case when there is no combination that is a total value large enough to perform the decoding in the third process, and in such a situation, the broadcast wave on another channel whose status is "reconfirmation required". Reconfirmation of the presence or absence of is not prioritized.

The control unit 400 calculates the total value of the single CNRs of the two tuners 100 included in the combination for each of the plurality of types of combinations of the two tuners 100 in the four tuners 100. The plurality of types of combinations include a combination of the first tuner 100a and the second tuner 100b, a combination of the first tuner 100a and the third tuner 100c, a combination of the first tuner 100a and the fourth tuner 100d, and the second tuner 100b. The combination with the third tuner 100c, the combination with the second tuner 100b and the fourth tuner 100d, and the combination with the third tuner 100c and the fourth tuner 100d are included. The control unit 400 compares the total value of each combination with the second threshold value, and selects a total value that is equal to or greater than the second threshold value. The second threshold value is determined by adding a margin to the minimum CNR that can be decoded by the first decoding unit 340a, similarly to the first threshold value. The second threshold value may be the same value as the first threshold value, or may be a different value. Further, the control unit 400 selects the minimum total value among the selected total values. Further, the control unit 400 determines to use the two tuners 100 included in the combination corresponding to the selected minimum total value for the third process. Since the processing following this is the same as that of pattern 3-1, the description thereof is omitted here.

(D) Pattern 3-4
Pattern 3-4 is executed when there is no total value equal to or higher than the second threshold value in pattern 3-3. When there is no total value equal to or higher than the second threshold value, the control unit 400 determines to use the two tuners 100 included in the combination corresponding to the maximum total value for the third process. Since the processing following this is the same as that of pattern 3-1, the description thereof is omitted here.

(E) Pattern 3-5
Pattern 3-5 is executed when there is no other channel whose status is determined to be "reconfirmation required" by the first first process. That is, pattern 3-5 is executed when the conditions for executing pattern 3-1 are not satisfied. If there is no other channel whose status is determined to be "reconfirmation required", the first process performed on the other channel is the first first process. Any combination may be used in the first processing of the first time, but if the combination used in the channel already determined to have "broadcast wave" is used, it is determined to have "broadcast wave" in other channels as well. The possibility of Therefore, it is preferable to use two tuners 100 (hereinafter, referred to as "candidate tuners 100") other than the two tuners 100 used in the channel already determined to have "broadcast waves" for the third processing. However, if the decoding in the third process using the candidate tuner 100 fails, it is not desirable to use the candidate tuner 100 in the third process. Therefore, the control unit 400 first determines whether or not the tuner 100, which is a candidate for use, can be used for the third process.

Specifically, the control unit 400 derives the number of times the combination of the two tuners 100 used in the channel already determined to have "broadcast wave" has been used for each combination. In the case of FIG. 3, the control unit 400 targets CH16 and CH18 as channels determined to have “broadcast waves”. Here, the first tuner 100a and the second tuner 100b are used for CH16. Further, CH18 is determined to have "broadcast waves" by the second first processing, and at that time, the first tuner 100a and the second tuner 100b are used. As a result, the number of times the first tuner 100a and the second tuner 100b are used becomes "2".

Further, the control unit 400 specifies two tuners 100 other than the two tuners 100 included in the combination that is used most frequently. In the case of the above example, since the number of times the first tuner 100a and the second tuner 100b are used is "2", which is the largest number, the third tuner 100c and the third tuner 100c and the second tuner 100b, which are combinations other than the first tuner 100a and the second tuner 100b, are used. 4 Tuner 100d is selected. The third tuner 100c and the fourth tuner 100d correspond to the tuner 100 which is a candidate for use. The control unit 400 calculates the total value of the single CNRs of the two identified tuners 100. In the case of the above example, the total value of the single CNR of the third tuner 100c and the single CNR of the fourth tuner 100d is calculated. If the total value is equal to or greater than the first threshold value, the control unit 400 determines that the two tuners 100 are used for the third process. Since the processing following this is the same as that of pattern 3-1, the description thereof is omitted here. Here, when the total value is smaller than the first threshold value, the control unit 400 executes the same processing as in (b) pattern 3-2, (c) pattern 3-3, and (d) pattern 3-4. ..

After executing the above third process, when the control unit 400 acquires the synthetic CNR and the broadcasting station information for each of the plurality of channels, the control unit 400 lists the broadcasting stations based on them. Since a known technique may be used for listing the broadcasting stations, the description thereof is omitted here. Further, while the first process or the third process is being executed for the first channel, the control unit 400 uses two unused tuners 100 and is different from the first channel. The first process for another channel (hereinafter, referred to as "second channel") is executed. Further, when the control unit 400 determines that the processing for the first channel is completed and that there is a broadcast wave in the first processing for the second channel, the second channel is set as the first channel so far. The second process and the third process for this are executed in order.

This configuration can be realized by the CPU, memory, and other LSIs of any computer in terms of hardware, and by programs loaded in memory in terms of software, but here it is realized by cooperation between them. It depicts a functional block to be done. Therefore, it will be understood by those skilled in the art that these functional blocks can be realized in various ways by hardware only, software only, or a combination thereof.

The operation of the broadcast receiving device 1000 with the above configuration will be described. FIG. 4 is a flowchart showing a processing procedure in the broadcast receiving device 1000. The control unit 400 searches for CHs requiring reconfirmation with the two designated tuners 100 (S50). If there is a corresponding CH (Y in S52), the control unit 400 searches for a CH that requires reconfirmation (S54). If there is no corresponding CH (N in S52), the control unit 400 searches for an unconfirmed CH (S56). If there is a broadcast wave (Y in S58), the control unit 400 records the history in the storage unit 500 with “with broadcast wave” (S60). The control unit 400 updates the status of the CH to "presence / absence determination" in the table stored in the storage unit 500 (S61).

If the processing of the tuner 100 other than the two tuners 100 in the other system, that is, the step 50 is the first processing (Y in S62), the control unit 400 waits until the first processing of the other system can be canceled (Y). S63) The single CNR is measured with the four tuners 100, and the synthetic CNR of the four tuners is calculated (S64). When demodulation is possible with the two selected tuners 100 (Y in S66), the control unit 400 acquires the broadcasting station information with the two selected tuners 100 (S68). If the two tuners 100 are not demodulatory (N in S66), step 68 is skipped. The control unit 400 updates the status of the CH to "confirmed" in the table stored in the storage unit 500 (S70). If it is not possible to cancel the processing of the tuners 100 other than the two tuners 100 in another system, that is, in step 50 (N in S62), the processing is terminated.

If there is no broadcast wave (N in S58), the control unit 400 records the history in the storage unit 500 with “no broadcast wave” (S72). If the status of the CH is "unconfirmed" (Y in S74), the control unit 400 updates the status of the CH to "reconfirmation required" in the table stored in the storage unit 500 (S76). If the status of the CH is not "unconfirmed" (N in S74), the control unit 400 updates the status of the CH to "confirmed presence / absence" in the table stored in the storage unit 500 (S78).

FIG. 5 is a flowchart showing a procedure of the first processing in the broadcast receiving device 1000. When the four tuners 100 are free (Y in S100), the control unit 400 refers to the table stored in the storage unit 500 and confirms whether there is a CH whose status is "reconfirmation required" (S102). ). When there is a corresponding CH (Y in S104), the control unit 400 selects the most combination of the tuner 100 combinations used in the “reconfirmation required” CH (S106). The control unit 400 determines the use of two tuners 100 other than the two tuners 100 included in the selected combination (S108).

When there is no corresponding CH (N in S104), the control unit 400 refers to the table stored in the storage unit 500 and confirms whether or not there is a CH “with broadcast wave” (S110). When there is a corresponding CH (Y in S112), the control unit 400 is included in the largest number of combinations of tuners 100 used when it is determined that there is a broadcast wave among the CHs of "with broadcast wave". The use of the two tuners 100 is determined (S114). When there is no corresponding CH (N in S112), the control unit 400 determines the use of the first tuner 100a and the second tuner 100b (S116). The control unit 400 searches for an unconfirmed CH (S118).

When the four tuners 100 are not available (N in S100), the control unit 400 refers to the table stored in the storage unit 500 and uses 2 in the CH whose status is "reconfirmation required". It is confirmed whether there is a CH using one tuner 100 (S120). When there is a corresponding CH (Y in S122), the control unit 400 determines the use of two tuners 100 other than the two tuners 100 in use for the corresponding CH (S126). If there is no corresponding CH (N in S122) and there is an unconfirmed CH (Y in S124), the control unit 400 uses two tuners 100 other than the two tuners 100 in use for the corresponding CH. Determine (S126). If there is no unconfirmed CH (N in S124), the control unit 400 fails (S128).

Here, the route transitioning through step 100, step 102, step 104, step 110, step 112, step 116, and step 118 is (A) pattern 1-1. The route that transitions through step 100, step 102, step 104, step 106, and step 108 is (B) pattern 1-2. The route transitioning through step 100, step 102, step 104, step 110, step 112, step 114, and step 118 is (C) pattern 1-3. The route transitioning through step 100, step 120, step 122, and step 126 is (D) pattern 1-4. The route transitioning through step 100, step 120, step 122, step 124, and step 126 is (E) pattern 1-5. The route transitioning through step 100, step 120, step 122, step 124, and step 128 is (F) pattern 1-6.

FIG. 6 is a flowchart showing a procedure of the third process in the broadcast receiving device 1000. The control unit 400 calculates the total value of the six sets (S200). The control unit 400 lists the CHs whose status is "reconfirmation required" among the tables stored in the storage unit 500 (S202). The control unit 400 selects the most combination of the combinations of the tuners 100 used (S204), and selects the total value for the two tuners 100 included in the selected combination (S206). If the total value is equal to or greater than the first threshold value (Y in S208), the control unit 400 determines the use of the two tuners 100 corresponding to the total value (S222).

If the total value is not equal to or greater than the first threshold value (N in S208), the control unit 400 deletes the two selected tuners 100 from the list (S210). If the list is not empty (N in S212), the process returns to step 204. If the list is empty (Y in S212), the control unit 400 confirms whether there is a combination of two tuners that is equal to or higher than the second threshold value among the total values of the six sets (S214). When there is a corresponding combination (Y in S216), the control unit 400 determines the combination of the two tuners having the minimum total value among the combinations having the second threshold value or more (S218). When there is no corresponding combination (N in S216), the control unit 400 determines the combination of the two tuners having the maximum total value (S220).

The route transitioning through step 200, step 202, step 204, step 206, step 208, and step 222 is (a) pattern 3-1. The route transitioning through step 208, step 210, step 212, step 204, step 206, and step 208 is (b) pattern 3-2. The route transitioning through step 212, step 214, step 216, and step 218 is (c) pattern 3-3. The route transitioning through step 212, step 214, step 216, and step 220 is (d) pattern 3-4.

FIG. 7 is a flowchart showing another procedure of the third process in the broadcast receiving device 1000. The control unit 400 calculates the total value of the six sets (S300). The control unit 400 lists the CHs “with broadcast wave” among the tables stored in the storage unit 500 (S302). The control unit 400 selects the most combination of the combinations of the tuners 100 used (S304), and selects the total value for two tuners 100 other than the two tuners 100 included in the selected combination (S306). .. If the total value is equal to or greater than the first threshold value (Y in S308), the control unit 400 determines the use of the two tuners 100 corresponding to the total value (S322).

If the total value is not equal to or greater than the first threshold value (N in S308), the control unit 400 deletes the two selected tuners 100 from the list (S310). If the list is not empty (N in S312), the process returns to step 304. If the list is empty (Y in S312), the control unit 400 checks whether there is a combination of two tuners that is equal to or higher than the second threshold value among the total values of the six sets (S314). When there is a corresponding combination (Y in S316), the control unit 400 determines the combination of the two tuners having the minimum total value among the combinations having the second threshold value or more (S318). When there is no corresponding combination (N in S316), the control unit 400 determines the combination of the two tuners having the maximum total value (S320).

The route transitioning through step 300, step 302, step 304, step 306, step 308, and step 322 is (e) pattern 3-5. The route transitioning through step 308, step 310, step 312, step 304, step 306, and step 308 is (b) pattern 3-2. The route transitioning through step 312, step 314, step 316, and step 318 is (c) pattern 3-3. The route transitioning through step 312, step 314, step 316, and step 320 is (d) pattern 3-4.

According to this embodiment, the first channel is different from the first channel by using two unused tuners while executing the first process or the third process. Since the first process is executed for the second channel, the process period can be shortened. Further, when it is determined in the first process that there is a broadcast wave, the composite CNR is calculated using four tuners, so that it is possible to suppress a decrease in the accuracy of listing the broadcasting stations. Further, the number of times of use of the combination of the two tuners used when it is determined that there is no broadcast wave is derived for each combination, and two tuners other than the two tuners included in the combination having the maximum number of times of use are used in the first processing. Since it is used, reconfirmation can be performed efficiently. Further, when it is determined that there is no broadcast wave, the next first process is executed by setting the first channel to two tuners other than the two tuners used, so that the presence or absence of the broadcast wave in all tuners is checked. Can be judged. Further, when it is determined that there is a broadcast wave in the next first process, the second process and the third process are executed. Therefore, even if the first process is executed without using the four tuners, the broadcasting station information Can be obtained.

Further, the number of times of use of the combination of the two tuners used when it is determined that there is no broadcast wave in the first first processing is derived for each combination, and the single CNR of the two tuners included in the combination having the maximum number of times of use is obtained. If the total value of is equal to or greater than the first threshold value, two tuners are selected, so that the possibility of acquiring broadcasting station information in the third process can be improved. Further, the number of times of use of the combination of the two tuners used when it is determined that there is no broadcast wave in the first first processing is derived for each combination, and the single CNR of the two tuners included in the combination having the maximum number of times of use is obtained. If the total value of is equal to or higher than the first threshold value, two tuners are selected. Therefore, the second first process is executed for the other channels determined to have no broadcast wave in the first first process. Can be done.

If the total value is smaller than the first threshold value and the total value of the single CNRs of the two tuners included in the combination with the next highest number of uses is greater than or equal to the first threshold value, the two tuners are used. Since the selection is made, the possibility of acquiring the broadcasting station information in the third process can be improved. If the total value is smaller than the first threshold value and the total value of the single CNRs of the two tuners included in the combination with the next highest number of uses is greater than or equal to the first threshold value, the two tuners are used. Since the selection is made, it is possible to execute the second first processing on the other channels determined to have no broadcast wave in the first first processing. Further, when the processing for the first channel is completed and it is determined that there is a broadcast wave for the second channel, the second processing and the third processing for the second channel are executed in order, so that the processing period Can be shortened.

In addition, after calculating the total value of the single CNRs of the two tuners included in each combination, the minimum total value among the total values that are equal to or higher than the second threshold value is selected, and the selected total value is supported. Since the combination of the above is used for the third process, the possibility of acquiring the broadcasting station information in the third process can be improved. In addition, after calculating the total value of the single CNRs of the two tuners included in each combination, the minimum total value among the total values that are equal to or higher than the second threshold value is selected, and the selected total value is supported. Since the combination to be used is used for the third process, the first process can be executed on another channel. Further, when there is no total value equal to or more than the second threshold value, the two tuners included in the combination corresponding to the maximum total value are used for the third process, so that the third process can be executed.

The present invention has been described above based on examples. This embodiment is an example, and it is understood by those skilled in the art that various modifications are possible for each of these components and combinations of each processing process, and that such modifications are also within the scope of the present invention. ..

The control unit 400 in this embodiment executes (a) pattern 3-1 or (e) pattern 3-5 as the third process, and then (b) pattern 3-2 to (d) pattern 3-4. Do at least one of. However, the present invention is not limited to this, and for example, the control unit 400 may execute only (c) pattern 3-3 or (d) pattern 3-4. According to this modification, the tuner 100 having a large single CNR can be used for the first processing for the second channel while enabling the decoding in the third processing.

100 Tuner, 110 Antenna, 120 LNA, 130 RF Amplifier, 140 Local Oscillator, 150 Mixer, 160 IF Amplifier, 200 Baseband Processing Unit, 210 A / D Converter, 220 Level Detector, 230 Gain Control Unit, 240 Orthogonal Demodulation unit, 250 FFT unit, 260 frame extraction unit, 270 CNR calculation unit, 300 synthesis unit, 310 de mapping unit, 320 MER calculation unit, 330 synthesis CNR calculation unit, 340 decoding unit, 350 output unit, 400 control unit, 500 storage units, 1000 broadcast receivers.

Claims (7)

N tuners (even number of n> = 4) that can receive broadcast waves from broadcasting stations via different antennas,
A compositing unit that is connected to the n tuners and synthesizes signals output from the n / 2 tuners.
A decoding unit that decodes the signal synthesized in the synthesis unit, and
By controlling the n tuners, the synthesis unit, and the decoding unit, it was determined in (1) the first process for determining the presence or absence of a broadcast wave, and (2) the presence of a broadcast wave in the first process. In this case, it is provided with a second process for calculating the synthetic CNR, and (3) a control unit for sequentially executing a third process for acquiring broadcasting station information after calculating the synthetic CNR in the second process.
The control unit
(1) At the time of the first processing, the first channel is set to n / 2 tuners of the n tuners, and synchronization is performed in at least one of the n / 2 tuners. If it is established, it is determined that there is a broadcast wave of the first channel.
(2) At the time of the second processing, the first channel is set in the n tuners, the signals output from the n tuners are synthesized in the synthesis unit, and the n tuners are combined. A single CNR for each of the tuners was calculated, and a synthetic CNR for the n tuners was calculated.
(3) At the time of the third processing, the total value of the single CNRs of n / 2 tuners included in the combination is calculated for each of the plurality of types of combinations of n / 2 tuners in the n tuners. The combination that is the smallest total value among the total values that are calculated and equal to or greater than the threshold value is selected, and the first channel is added to the n / 2 tuners included in the combination corresponding to the selected total value. After setting, the signals output from the n / 2 tuners are combined with the synthesizing unit, and the decoding unit is made to perform decoding.
While the first process or the third process is being executed for the first channel, an unused n / 2 tuner is used, and the first channel is different from the first channel. A broadcast receiving device characterized by executing the first process for two channels. The control unit is used when the first process has already been executed for each of the plurality of channels and when it is determined that there is no broadcast wave for each of the plurality of channels in the already executed first process. The number of times of use of the combination of n / 2 tuners is derived for each combination, and among the number of times of use for each of the derived combinations, n / other than n / 2 tuners included in the combination having the largest number of times of use. The broadcast receiving device according to claim 1, wherein the two tuners are used in the first processing for the first channel. When the control unit determines that there is no broadcast wave in the first process for the first channel, the first is applied to n / 2 tuners other than the n / 2 tuners used in the first process. By setting the channel of, the next first process is executed,
The broadcast receiving device according to claim 1 or 2, wherein the control unit executes the second process and the third process when it is determined that there is a broadcast wave in the next first process. .. When there is no total value equal to or greater than the threshold value in the third process, the control unit sets the first channel to n / 2 tuners included in the combination corresponding to the maximum total value. The broadcast receiving device according to any one of claims 1 to 3, wherein signals output from the n / 2 tuners are synthesized by the synthesis unit and decoding is performed by the decoding unit. When the control unit determines that the processing for the first channel is completed and that there is a broadcast wave in the first processing for the second channel, the second processing for the second channel and the second processing for the second channel are performed. The broadcast receiving device according to any one of claims 1 to 4, wherein the three processes are executed in order. An n tuners that can receive broadcast waves from a broadcasting station via different antennas, and a synthesizer that is connected to the n tuners and synthesizes signals output from the n / 2 tuners. By controlling the decoding unit that decodes the signal synthesized in the synthesis unit, the n tuners, the synthesis unit, and the decoding unit, (1) the first process for determining the presence or absence of a broadcast wave. , (2) The second process for calculating the synthetic CNR when it is determined that there is a broadcast wave in the first process, (3) For acquiring the broadcast station information after calculating the synthetic CNR in the second process. A broadcast receiving method in a broadcast receiving device including a control unit for sequentially executing a third process.
When the first channel is set to n / 2 tuners of the n tuners during the first process and synchronization is established in at least one of the n / 2 tuners. In addition, the step of determining that there is a broadcast wave of the first channel,
At the time of the second processing, the first channel is set in the n tuners, the signals output from the n tuners are synthesized in the synthesis unit, and each of the n tuners is combined. In the step of calculating the single CNR in the above and calculating the synthetic CNR of the n tuners,
At the time of the third processing, the total value of the single CNRs of n / 2 tuners included in the combination was calculated for each of the plurality of types of combinations of n / 2 tuners in the n tuners. Select the combination that is the minimum total value among the total values that exceed the threshold value, and set the first channel to n / 2 tuners included in the combination that corresponds to the selected total value. , A step of causing the synthesizer to synthesize signals output from the n / 2 tuners and having the decoding unit perform decoding.
While the first process or the third process is being performed on the first channel, an unused n / 2 tuner is used to make a different channel from the first channel. The step of executing the first process for the channel 2 and
A broadcast receiving method characterized by comprising. An n tuners that can receive broadcast waves from a broadcasting station via different antennas, and a synthesizer that is connected to the n tuners and synthesizes signals output from the n / 2 tuners. By controlling the decoding unit that decodes the signal synthesized in the synthesis unit, the n tuners, the synthesis unit, and the decoding unit, (1) the first process for determining the presence or absence of a broadcast wave. , (2) Second process for calculating synthetic CNR when it is determined in the first process that there is a broadcast wave, (3) For acquiring broadcast station information after calculating synthetic CNR in the second process. A broadcast reception control program that is executed by a broadcast receiving device including a control unit that executes a third process in order.
When the first channel is set to n / 2 tuners of the n tuners during the first process and synchronization is established in at least one of the n / 2 tuners. In addition, the step of determining that there is a broadcast wave of the first channel,
At the time of the second processing, the first channel is set in the n tuners, the signals output from the n tuners are synthesized in the synthesis unit, and each of the n tuners is combined. In the step of calculating the single CNR in the above and calculating the synthetic CNR of the n tuners,
At the time of the third processing, the total value of the single CNRs of n / 2 tuners included in the combination was calculated for each of the plurality of types of combinations of n / 2 tuners in the n tuners. Select the combination that is the minimum total value among the total values that exceed the threshold value, and set the first channel to n / 2 tuners included in the combination that corresponds to the selected total value. , A step of causing the synthesizer to synthesize signals output from the n / 2 tuners and having the decoding unit perform decoding.
While the first process or the third process is being performed on the first channel, an unused n / 2 tuner is used to make a different channel from the first channel. The step of executing the first process for the channel 2 and
A broadcast reception control program characterized by having a computer execute.

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