JP7283286B2 - Broadcast receiving device, broadcast receiving method, broadcast receiving control program - Google Patents

Description

TECHNICAL FIELD The present invention relates to reception technology, and more particularly to a broadcast receiving apparatus for receiving broadcast waves, a broadcast receiving method, and a broadcast reception control program.

If multipath propagation exists when receiving digital television broadcast waves, fading occurs in the received signal, making stable reception difficult. In such an environment, diversity reception using a plurality of antennas is effective and has been put into practical use (see, for example, Patent Document 1).

WO 11/105074

A broadcast receiver that can receive broadcast waves lists broadcast stations that can be received in the vicinity of the area used by the user before starting to view a program included in the broadcast waves. At this time, a broadcast receiving apparatus capable of executing diversity reception simultaneously sets, for example, channels for which the presence or absence of broadcast waves should be checked to all tuners. As a result, the broadcast receiving apparatus uses all tuners to detect the presence or absence of broadcast waves, calculate CNR (Carrier to Noise Ratio), and obtain information such as TSID (Transport Stream Identification) (hereinafter referred to as "broadcasting station information"). ) are collected and processed. After confirming all the channels, the broadcast receiving apparatus lists the broadcasting stations based on the calculated CNR and the broadcasting station information. According to such processing, since the same channel is set to all tuners, the accuracy of listing broadcasting stations is increased, but the processing period is lengthened.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique for shortening the processing period while suppressing deterioration in the accuracy of listing broadcast stations.

In order to solve the above problems, a broadcast receiving apparatus according to one aspect of the present invention includes n (an even number of n>=4) tuners each capable of receiving broadcast waves from a broadcasting station via different antennas. , a synthesizing unit connected to n tuners and synthesizing signals output from the n/2 tuners, a decoding unit decoding the signals synthesized in the synthesizing unit, n tuners, a synthesizing unit, and a decoding unit By controlling (1) first processing for determining the presence or absence of broadcast waves, (2) second processing for calculating the combined CNR when it is determined that there is a broadcast wave in the first processing, ( 3) A control unit for sequentially executing a third process for obtaining broadcast station information after calculating the combined CNR in the second process. (1) during the first process, the control unit sets the first channel to n/2 tuners out of the n tuners and synchronizes in at least one of the n/2 tuners; is established, it is determined that there is a broadcast wave of the first channel, and (2) in the second process, the first channel is set to the n tuners and output from the n tuners The signals are synthesized by a synthesizing unit, the single CNR of each of the n tuners is calculated, the synthesized CNR of the n tuners is calculated, and (3) in the third process, the A first channel is set to n/2 tuners selected based on a single CNR, signals output from the n/2 tuners are combined in a synthesizing unit, and decoding is performed in a decoding unit. , while performing the first process or the third process on the first channel, using the unused n/2 tuners, a second channel different from the first channel perform a first process on

Another aspect of the present invention is a broadcast reception method. In this method, n tuners each capable of receiving broadcast waves from broadcasting stations are connected to the n tuners via different antennas, and the signals output from the n/2 tuners are synthesized. By controlling the synthesizing unit, the decoding unit that decodes the signal synthesized in the synthesizing unit, the n tuners, the synthesizing unit, and the decoding unit, (1) first processing for determining the presence or absence of broadcast waves, (2) A second process for calculating the combined CNR when it is determined in the first process that there is a broadcast wave, (3) A third process for acquiring broadcast station information after deriving the combined CNR in the second process. A broadcast receiving method in a broadcast receiving apparatus, comprising: a control unit that sequentially executes / determining that there is a broadcast wave of a first channel when synchronization is established in at least one of the two tuners; and transmitting the first channel to the n tuners in the second process a step of synthesizing signals output from n tuners in a synthesizing unit, calculating a single CNR in each of the n tuners, and calculating a synthesized CNR of the n tuners; , the first channel is set to n/2 tuners selected based on the single CNR in each of the n tuners, and the signals output from the n/2 tuners are sent to the synthesizing section. synthesizing and causing the decoding unit to perform decoding; and using unused n/2 tuners while performing the first process or the third process on the first channel , performing a first process on a second channel that is different from the first channel.

Any combination of the above constituent elements, and conversion of expressions of the present invention into methods, devices, systems, recording media, computer programs, etc. are also effective as aspects of the present invention.

According to the present invention, it is possible to shorten the processing period while suppressing deterioration in the accuracy of listing broadcast stations.

It is a figure which shows the structure of the broadcast receiving apparatus which concerns on an Example. 2 is a flow chart showing a processing procedure in the broadcast receiving device of FIG. 1; 2 is a diagram showing the data structure of a table stored in the storage unit of FIG. 1; FIG. 2 is a flow chart showing a processing procedure in the broadcast receiving device of FIG. 1; FIG. 2 is a flow chart showing the procedure of a first process in the broadcast receiving device of FIG. 1; FIG. 3 is a flow chart showing the procedure of a third process in the broadcast receiving device of FIG. 1; FIG. 10 is a flowchart showing another procedure of the third process in the broadcast receiving device of FIG. 1; FIG.

Before specifically describing the present invention, an overview will be given first. The present embodiment relates to a broadcast receiving apparatus having n (an even number of n>=4) tuners, for example, four tuners, and capable of performing diversity reception. Broadcast receivers are, for example, in-vehicle equipment and portable equipment. The broadcast receiving apparatus lists broadcast stations that can be received in the vicinity of the area used by the user, and then starts viewing a program included in the broadcast wave. Since this embodiment relates to the listing of broadcasting stations, a description of viewing programs included in broadcast waves will be omitted. As described above, the broadcast receiver sets all tuners to the same channel (hereinafter referred to as "method 1") and obtains broadcast station information through diversity reception using four tuners. According to Method 1 as described above, the processing period for acquiring the broadcasting station information becomes longer. Further, for example, when six or more tuners are provided, processing may be performed by dividing into two systems of three tuners. Although there is a mode with an odd number of tuners, such as five tuners divided into two systems of 3 tuners + 2 tuners, this embodiment will describe a mode with four or more even tuners.

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

It is assumed that the broadcasting stations are listed up in a place with a good reception environment in the area, and the vehicle is stopped so that the level of the received radio wave, for example, the CNR, varies with time. However, if the CNR fluctuates with time, it may not be possible to select the best broadcasting station for listing. For example, CH27 and CH35 are used by the same broadcasting station, and basically the CNR of CH27 is greater than the CNR of CH35. There is Under such circumstances, CH35 may be listed as the channel of the broadcasting station.

Even if such time variation of CNR occurs in one tuner, method 1 reduces the influence of time variation by diversity reception of four tuners. On the other hand, in method 2, since diversity reception is performed with two tuners, the effect of time fluctuation is greater than in method 1. Also, in method 1, the CNR is calculated by diversity reception of four tuners, but in method 2, the CNR is calculated by diversity reception of two tuners. For example, CH27 and CH35 are used by the same broadcasting station, and basically the CNR of CH27 is greater than the CNR of CH35. is sometimes judged to be Therefore, when method 2 is used, the processing period is shorter than that of method 1, but there is a possibility that the accuracy of listing broadcasting stations may be lowered.

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

FIG. 1 shows the configuration of a broadcast receiving apparatus 1000. As shown in FIG. Broadcast receiving apparatus 1000 includes first tuner 100a, second tuner 100b, third tuner 100c, and fourth tuner 100d, which are collectively referred to as tuner 100, first baseband processing section 200a, which is collectively referred to as baseband processing section 200; A second baseband processing unit 200b, a third baseband processing unit 200c, a fourth baseband processing unit 200d, a first synthesis unit 300a, a second synthesis unit 300b, and a de-mapping unit 310, which are generally referred to as synthesis units 300. A first de-mapping unit 310a, a second de-mapping unit 310b, a first MER calculation unit 320a, a second MER calculation unit 320b, and a composite CNR calculation unit 330, which are collectively referred to as a MER (Modulation Error Ratio) calculation unit 320. A first combined CNR calculation unit 330a, a second combined CNR calculation unit 330b, a first decoding unit 340a and a second decoding unit 340b, collectively referred to as a decoding unit 340, a first output unit 350a, collectively referred to as an output unit 350, a second 2 outputs 350b. The number of tuners 100 and baseband processing units 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. include. 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 section. Oscillators 140 a through 4 th local oscillator 140 d are collectively referred to as local oscillator 140 , first mixers 150 a through 4 th mixers 150 d are collectively referred to as mixer 150 , and first IF amplifier 160 a through fourth IF amplifier 160 d are collectively referred to as IF amplifier 160 . 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). It includes a section 250a, a first frame extraction section 260a, and a first CNR calculation section 270a. 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, a second frame extraction unit 260b, A second CNR calculator 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, a third frame extraction unit 260c, A third CNR calculator 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, a fourth frame extraction unit 260d, A fourth CNR calculator 270d is included.

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

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 on mutually different frequencies are defined, and each broadcasting station broadcasts broadcast waves in the permitted channels. The first tuner 100a can receive broadcast waves from a broadcasting station (not shown) via the first antenna 110a. First LNA 120a amplifies broadcast waves (hereinafter referred to as "received signals") received at first antenna 110a. Here, the received signal is an RF signal. The first RF amplifier 130a amplifies the received signal amplified by the first LNA 120a (hereinafter also referred to as "received signal"). The amplification factor of the first RF amplifier 130a changes according to the RF amplification factor control signal from the first gain control section 230a.

The first local oscillator 140a outputs a local oscillation signal with a frequency corresponding to the frequency of the channel to be received. The first mixer 150a down-converts the received signal amplified by the first RF amplifier 130a (hereinafter also referred to as the "received signal") by the local oscillation signal from the first local oscillator 140a. Down conversion results in conversion of the RF signal to an IF signal. The first IF amplifier 160a amplifies the received signal (hereinafter also referred to as "received signal") converted into an IF signal by the first mixer 150a. The amplification factor of first IF amplifier 160a changes according to the IF amplification factor control signal from first gain control section 230a.

The first A/D converter 210a converts the received signal amplified by the first IF amplifier 160a from an analog signal to a digital signal. The first level detector 220a detects the level of the received signal converted into a digital signal by the first A/D converter 210a (hereinafter also referred to as "received signal"). Based on the level detected by first level detector 220a, first gain control section 230a adjusts the gain of first LNA 120a so that the level of the received signal from first A/D converter 210a approaches the target value. It controls the amplification factor of the first IF amplifier 160a. The first gain control section 230a outputs the gain of the first LNA 120a as an RF gain control signal to the first RF amplifier 130a, and outputs the gain of the first IF amplifier 160a as an IF gain control signal to the first IF amplifier 160a.

The first quadrature demodulator 240a converts the IF signal into a baseband signal by performing quadrature demodulation on the received signal from the first A/D converter 210a. A received signal of the baseband signal (hereinafter also referred to as a "received signal") has an I component and a Q component. The first FFT section 250a transforms the time domain signal into a frequency domain signal by performing FFT on the received signal from the first quadrature demodulation section 240a. The first FFT section 250a converts the received signal, which is a signal in the frequency domain (hereinafter also referred to as "received signal"), into a first frame extraction section 260a, a first CNR calculation section 270a, a first combining section 300a, a second combining section 300b can be output.

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

The second tuner 100b to the fourth tuner 100d perform the same processing as the first tuner 100a, and the second baseband processing section 200b to the fourth baseband processing section 200d perform the same processing as the first baseband processing section 200a. Execute the process. Therefore, it can be said that n tuners 100 are capable of receiving broadcast waves from broadcasting stations via different antennas 110, respectively.

The first synthesizing section 300a is connected from the first baseband processing section 200a to the fourth baseband processing section 200d. The first synthesizing unit 300a selects two of the first baseband processing unit 200a to the fourth baseband processing unit 200d according to an instruction from the control unit 400, and selects the selected two baseband processing units 200 combine the received signals from At that time, weighting is performed by the 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 combining 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 weights the received signal from the first baseband processing unit 200a by the independent CNR in the second baseband processing unit 200b. The received signal from the processing section 200b is weighted. The first combiner 300a combines these weighted received signals. The fourth baseband processing unit 200d may be instructed from the first baseband processing unit 200a in accordance with an instruction from the control unit 400. FIG.

The first de-mapping section 310a determines data included in the broadcast wave from the received signal combined in the first combining section 300a (hereinafter also referred to as "received signal"). The first MER calculation unit 320a calculates the MER from the de-mapping result in the first de-mapping unit 310a. First combined CNR calculator 330a converts the MER calculated by first MER calculator 320a into an equivalent CNR. For example, the first combined CNR calculator 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 the combined CNR, which is the CNR in the case of diversity reception. 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 combined in the first combining section 300a. At that time, error correction processing may be performed. The first output section 350a outputs the data decoded by the first decoding section 340a as a TS signal or broadcasting station information.

The second synthesizing unit 300b to the second output unit 350b perform the same processing as the first synthesizing unit 300a to the first output unit 350a. Since the first output section 350a may be omitted from the first synthesizing section 300a in the present embodiment, the description thereof will be omitted here.

Control unit 400 controls the operation of broadcast receiving apparatus 1000 . For example, the control section 400 controls four tuners 100, four baseband processing sections 200, a synthesizing section 300, a decoding section 340, and the like. For this control, the control section 400 is connected to any component of the output section 350 from the tuner 100 . FIG. 2 is a flowchart showing a processing procedure in broadcast receiving apparatus 1000. As shown in FIG. This shows processing for one channel. Control unit 400 causes tuner 100 and baseband processing unit 200 to execute a first process for determining the presence or absence of broadcast waves (S10). If the first process determines that there are broadcast waves (Y in S12), the control unit 400 includes the tuner 100, the baseband processing unit 200, the combining unit 300, the de-mapping unit 310, the MER calculation unit 320, and the combined CNR calculation unit. 330 is caused to execute a second process for calculating the combined CNR (S14). After calculating the combined CNR in the second process, the control unit 400 causes the tuner 100, the baseband processing unit 200, the combining unit 300, the de-mapping unit 310, the decoding unit 340, and the output unit 350 to obtain broadcasting station information. is executed (S16). If the first process determines that there is no broadcast wave (N of S12), steps 14 and 16 are skipped, and the process for one channel ends. Return to FIG.

Below, the processing in the control unit 400 will be described in order of (1) first processing, (2) second processing, and (3) third processing.
(1) First process Control unit 400 selects two tuners 100 out of four tuners 100 to execute the first process. To select two tuners 100, 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 executed for the first time, that is, under the condition that no broadcasting stations are listed. In pattern 1-1, control unit 400 sets channels to be processed (hereinafter referred to as “first channels”) to two predetermined tuners 100 out of four tuners 100 . For example, the control unit 400 sets CH13 as the first channel for the first tuner 100a and the second tuner 100b. The first tuner 100a, the first baseband processing section 200a, the second tuner 100b, and the second baseband processing section 200b perform the above-described processing.

The control unit 400 receives results regarding whether or not frame synchronization has been established from the first frame extraction unit 260a and the second frame extraction unit 260b. When synchronization is established in at least one of the first frame extractor 260a and the second frame extractor 260b, the controller 400 determines that there is a broadcast wave of the first channel. 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 or the second frame extraction unit 260b. Further, since the third tuner 100c and the fourth tuner 100d are unused, the control unit 400 determines that the status is "reconfirmation required". Reconfirmation required indicates that the first processing needs to be performed again because it was determined that there was no broadcast wave in the first processing for the first time.

Control unit 400 stores the result of such processing in storage unit 500 . FIG. 3 shows the data structure of a table stored in the storage unit 500. As shown in FIG. 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 process has been executed for the first time from CH13 to CH18 and the first process for CH19 has not been executed for the first time. The "status" indicates any of unconfirmed, reconfirmation required, presence/absence confirmed, and confirmed. Unconfirmed indicates that the first process has not been executed for the first time. Further, reconfirmation required is as described above, and presence/absence determination and confirmed will be described later. "Broadcast wave presence/absence determination result" indicates "yes" or "no". "Yes" indicates that it is determined that there is a broadcast wave, that is, that frame synchronization has been established, and "None" indicates that it is determined that there is no broadcast wave. "First tuner" to "fourth tuner" indicate whether they are used or not. "Used" indicates that the tuner 100 is used, and "Unused" indicates that the tuner 100 is not used. At the time when pattern 1-1 ends, the "first tuner" column and the "second tuner" column are indicated as "used (1)", and the "third tuner" column and the "fourth tuner" column are indicated. is indicated as "unused". Here, (1) indicates that it is the tuner used in the first process of the first time. 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 airwaves in a channel for which four tuners 100 are available and whose status is "reconfirmation required". Since the channel whose status is "reconfirmation required" has already performed the first process for the first time, pattern 1-2 corresponds to the case where the first process is performed for the second time. The control unit 400 derives the number of times of use of the combination of the two tuners 100 used when it is determined that there is no broadcast wave in the first process already executed for the first time. 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 of use of the third tuner 100c and the fourth tuner 100d is "2", and the number of times of use of the first tuner 100a and the second tuner 100b is "1".

Further, control unit 400 selects two tuners 100 other than the two tuners 100 included in the combination with the largest number of times of use for use in the first process. In the case of the above example, the combination with the largest number of times of use is the third tuner 100c and the fourth tuner 100d, so the control section 400 selects the first tuner 100a and the second tuner 100b. Furthermore, the control unit 400 extracts, for example, CH14 as the first channel to be processed from the channels CH14 and CH17 on which the first processing by the selected first tuner 100a and second tuner 100b is not performed. The subsequent processing is the same as pattern 1-1, so the description is omitted here. Among them, the status for the first channel is updated to "Confirmed". Further, 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 confirmed". In other words, when the status is “presence/absence confirmed”, it is a transitional state in which “broadcast wave is present” but the third process is not performed. Also, the first and second tuners for the first channel are changed to "use (2)". Here, (2) indicates the tuner used in the second first process.

(C) Pattern 1-3
Pattern 1-3 is the case where four tuners 100 are available, there is no channel whose status is "reconfirmation required", and there is a channel determined to be "broadcast wave present" by the first processing for the first time. is executed. This is performed for channels that have not been subjected to the first process for the first time. The control unit 400 derives the number of times of use of the combination of the two tuners 100 used in the channel determined to have "broadcast wave" by the first processing for the first time 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, for CH16, a first tuner 100a and a second tuner 100b are used. Also, 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 being used. As a result, the number of uses of the first tuner 100a and the second tuner 100b is "2".

In addition, control unit 400 selects two tuners 100 included in the combination with the largest number of times of use for use in the first process. In the case of the above example, the combination that has the largest number of times of use is the first tuner 100a and the second tuner 100b, so the control section 400 selects the first tuner 100a and the second tuner 100b. The subsequent processing is the same as that of pattern 1-1, so the description is omitted here.

(D) Pattern 1-4
Patterns 1-4 are executed to reconfirm the presence or absence of airwaves in channels for which two tuners 100 are available and whose status is "reconfirmation required". This assumes that two tuners other than the two available tuners 100 are being used in the first or third process for other channels. Also, since the first process has been performed for the first time in the channel whose status is "reconfirmation required", pattern 1-4 corresponds to the case where the first process is performed for the second time. The control unit 400 extracts, from among the channels whose status is "reconfirmation required", channels in which two tuners 100 other than the two usable tuners 100 are used in the first processing for the first time, as the first channels. 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 selects the third tuner 100c and the fourth tuner 100d among CH14 and CH17 used in the first processing of the first time, for example Extract CH14 as the first channel.

The subsequent processing is the same as pattern 1-1, so the description is omitted here. Among them, the status for the first channel is updated to "presence/absence determined".

(E) Pattern 1-5
Patterns 1-5 can use two tuners 100, for example, a first tuner 100a and a second tuner 100b. It is executed when there are not two tuners 100 to be used in one process. Therefore, pattern 1-5 is executed for a channel that has not yet been subjected to the first process for the first time, for example, CH19 shown in FIG. The control unit 400 uses two tuners 100 that are available.

(F) Pattern 1-6
Pattern 1-6 is executed when there is no channel for which the first process has not been executed for the first time in pattern 1-5. In this case, since there is no tuner 100 to be used for the first process, control unit 400 shifts to the standby state.

(2) Second process The control unit 400 sets the first channel determined to have broadcast waves in the first process to the four tuners 100 . Further, the control unit 400 causes the first combining unit 300a to combine the received signals output from the four baseband processing units 200, and calculates the combined CNR of the received signals combined in the first combining unit 300a. Let the part 330a calculate. Furthermore, 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 combined CNR and independent CNR in the table of the storage unit 500 . FIG. 3 shows the composite CNR for CH16 determined to have broadcast waves in the first process, and the single CNR for the first tuner to the single CNR for the fourth tuner. Here, the first tuner independent CNR to the fourth tuner independent CNR correspond to the independent CNR calculated by the fourth CNR calculating section 270d from the independent CNR calculated by the first CNR calculating section 270a. Return to FIG.

(3) Third Process As the third process, the control section 400 sets the first channel to the two tuners 100 selected based on the single CNR of each of the four tuners 100 . Further, the control section 400 causes the first combining section 300a to combine the received signals output from the two tuners 100, and causes the first decoding section 340a to perform decoding. To select two tuners 100, the control unit 400 executes (a) pattern 3-1 or (e) pattern 3-5. Also, (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. It is executed to give priority to reconfirming the presence or absence of broadcast waves in In such a situation, two tuners 100 other than the two tuners 100 to be used for reconfirming the presence or absence of broadcast waves on other channels (hereinafter referred to as "candidate tuners 100 for use") are used for the third process. is preferred. However, if the decoding in the third process using the use candidate tuner 100 fails, it is not desirable to use the use candidate tuner 100 in the third process. Therefore, control unit 400 first determines whether or not use candidate tuner 100 can be used for the third process.

More specifically, when there is another channel whose status requires reconfirmation, the control unit 400 selects the combination of the two tuners 100 used when it is determined that there is no broadcast wave in the first processing for the first time. 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 of use of the third tuner 100c and the fourth tuner 100d is "2", and the number of times of use of the first tuner 100a and the second tuner 100b is "1".

In addition, control unit 400 identifies two tuners 100 included in the combination with the largest number of times of use. In the case of the above example, the number of times of use of the combination of the third tuner 100c and the fourth tuner 100d is "2", which is the largest number, so the third tuner 100c and the fourth tuner 100d are selected. When reconfirming the presence or absence of broadcast waves for CH14 and CH17, the first tuner 100a and the second tuner 100b should be used. Equivalent to. Control unit 400 calculates the total value of the independent 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 calculating the total value, for example, addition of true values of individual CNRs is used. If the total value is greater than or equal to the first threshold, control unit 400 determines to use the two tuners 100 for the third process. The first threshold is a value determined by adding a margin such as 3 dB to the lowest CNR that can be decoded in the first decoding unit 340a. Subsequently, the control unit 400 causes the first combining unit 300a to combine received signals output from the baseband processing units 200 connected to the two tuners 100 that have been determined to be used. Further, the control unit 400 obtains the broadcast station information output from the first output unit 350a by causing the first decoding unit 340a to perform decoding. Further, when acquiring the broadcasting station information, the control unit 400 sets the status of the first channel to "confirmed", sets the broadcast wave presence/absence determination result to "yes", and sets the table stored in the storage unit 500. Update each.

(b) Pattern 3-2
Pattern 3-2 is executed when the total value of the single CNRs of the two tuners 100 specified in pattern 3-1 is smaller than the first threshold. If the total value is smaller than the first threshold value, control unit 400 again identifies two tuners 100 included in the combination with the next largest number of times of use. In the case of the above example, the first tuner 100a and the second tuner 100b are selected. This corresponds to reconfirming the presence or absence of broadcast waves for CH15 instead of reconfirming the presence or absence of broadcast waves for CH14 and CH17. Control unit 400 calculates the total value of the independent CNRs of the two tuners 100 that have been identified 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 greater than or equal to the first threshold, control unit 400 determines to use the two tuners 100 for the third process. The subsequent processing is the same as pattern 3-1, so the description 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 identified in pattern 3-2 is smaller than the first threshold. This is the case where there is no combination that results in a total value that is large enough to perform decoding in the third process. No priority is given to reconfirmation of the presence or absence of

Control unit 400 calculates the total value of individual CNRs of two tuners 100 included in each of the multiple types of combinations of two tuners 100 in four tuners 100 . A combination of a plurality of types includes 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 a combination of the second tuner 100b. A combination with the third tuner 100c, a combination of the second tuner 100b and the fourth tuner 100d, and a combination of the third tuner 100c and the fourth tuner 100d are included. Control unit 400 compares the total value of each combination with the second threshold, and selects the total value equal to or greater than the second threshold. The second threshold, like the first threshold, is determined by adding a margin to the lowest CNR that can be decoded in first decoding section 340a. The second threshold may be the same value as the first threshold, or may be a different value. Also, the control unit 400 selects the minimum total value from the selected total values. Further, control unit 400 determines to use two tuners 100 included in the combination corresponding to the selected minimum total value for the third process. The subsequent processing is the same as pattern 3-1, so the description is omitted here.

(d) Pattern 3-4
Pattern 3-4 is executed when there is no total value equal to or greater than the second threshold in pattern 3-3. If there is no total value greater than or equal to the second threshold value, control unit 400 determines to use two tuners 100 included in the combination corresponding to the maximum total value for the third process. The subsequent processing is the same as pattern 3-1, so the description 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 processing for the first time. That is, pattern 3-5 is executed when the conditions for executing pattern 3-1 are not met. If there is no other channel whose status is determined to be "reconfirmation required", the first processing performed on the other channels is the first first processing. Any combination may be used in the first processing for the first time, but if a combination used in a channel that has already been determined to have "broadcast waves" is used, other channels will also be determined to have "broadcast waves". increase the likelihood of Therefore, it is preferable to use two tuners 100 other than the two tuners 100 (hereinafter referred to as "candidate tuners 100 for use") other than the two tuners 100 that have already been used in the channel determined to have "broadcast waves" in the third process. However, if the decoding in the third process using the use candidate tuner 100 fails, it is not desirable to use the use candidate tuner 100 in the third process. Therefore, control unit 400 first determines whether or not use candidate tuner 100 can be used for the third process.

Specifically, the control unit 400 derives the number of times of use of the combination of the two tuners 100 used in the channel already determined to have "broadcast wave" 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, for CH16, a first tuner 100a and a second tuner 100b are used. Also, CH18 is determined to have "broadcast waves" by the second first process, and at that time, the first tuner 100a and the second tuner 100b are being used. As a result, the number of uses of the first tuner 100a and the second tuner 100b is "2".

Control unit 400 also identifies two tuners 100 other than the two tuners 100 included in the combination that has the largest number of uses. In the case of the above example, the number of times of use of the first tuner 100a and the second tuner 100b is "2", which is the largest number. 4 tuner 100d is selected. The third tuner 100c and the fourth tuner 100d correspond to the candidate tuners 100 for use. Control unit 400 calculates the total value of the independent CNRs of the two specified 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 greater than or equal to the first threshold, control unit 400 determines to use the two tuners 100 for the third process. The subsequent processing is the same as pattern 3-1, so the description is omitted here. Here, if the total value is smaller than the first threshold, the control unit 400 executes the same processing as (b) pattern 3-2, (c) pattern 3-3, and (d) pattern 3-4. .

After executing the above third process, the control unit 400 obtains the composite CNR and broadcasting station information for each of the plurality of channels, and lists the broadcasting stations based on them. A well-known technique may be used for listing broadcasting stations, so the explanation is omitted here. Also, while executing the first process or the third process for the first channel, the control unit 400 uses two unused tuners 100 to perform a different tune from the first channel. A first process is executed for another channel (hereinafter referred to as "second channel"). Furthermore, 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 regarded as the first channel so far, The second process and the third process for this are executed in order.

In terms of hardware, this configuration can be realized by any computer's CPU, memory, and other LSIs, and in terms of software, it is realized by programs loaded in the memory, etc., but here it is realized by linking them. It depicts the function blocks to be used. Therefore, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

The operation of the broadcast receiving apparatus 1000 configured as above will be described. FIG. 4 is a flowchart showing a processing procedure in broadcast receiving apparatus 1000. As shown in FIG. The control unit 400 searches for a CH requiring reconfirmation in the two specified tuners 100 (S50). If there is a corresponding CH (Y of S52), the control unit 400 searches for a CH requiring reconfirmation (S54). If there is no corresponding CH (N of S52), the control unit 400 searches for an unconfirmed CH (S56). If there is a broadcast wave (Y of S58), the control unit 400 records the history in the storage unit 500 as "broadcast wave present" (S60). The control unit 400 updates the status of the CH to "presence/absence confirmed" in the table stored in the storage unit 500 (S61).

If the processing of the tuner 100 other than the two tuners 100 in step 50 is the first processing (Y of S62), the control unit 400 waits until the first processing of the other system can be canceled ( S63), the individual CNRs of the four tuners 100 are measured, and the combined CNR of the four tuners is calculated (S64). If demodulation is possible with the selected two tuners 100 (Y of S66), the control section 400 acquires broadcasting station information with the two selected tuners 100 (S68). If demodulation is not possible with two tuners 100 (N of 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 stop the processing of tuners 100 other than the two tuners 100 in step 50 (N of S62), the processing is terminated.

If there is no broadcast wave (N of S58), the control unit 400 records the history in the storage unit 500 as "no broadcast wave" (S72). If the status of the CH is "unconfirmed" (Y of 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 of S74), the control unit 400 updates the status of the CH to "presence/absence confirmed" in the table stored in the storage unit 500 (S78).

FIG. 5 is a flowchart showing the procedure of the first process in broadcast receiving apparatus 1000. As shown in FIG. If four tuners 100 are available (Y of S100), the control unit 400 refers to the table stored in the storage unit 500 and checks whether there is a channel whose status is "reconfirmation required" (S102). ). If there is a corresponding CH (Y of S104), the control unit 400 selects the combination of the tuners 100 that have been used in the largest number among the CHs of "reconfirmation required" (S106). Control unit 400 determines the use of two tuners 100 other than the two tuners 100 included in the selected combination (S108).

If there is no corresponding CH (N of S104), the control section 400 refers to the table stored in the storage section 500 and checks whether there is a CH with "broadcast wave present" (S110). If there is a corresponding CH (Y of S112), the control unit 400 determines that the tuner 100 is included in the most common combination among the combinations of the tuners 100 used when it is determined that there is a broadcast wave, among the "broadcast wave present" CHs. Use of the two tuners 100 is determined (S114). If there is no corresponding CH (N of S112), the control unit 400 determines use of the first tuner 100a and the second tuner 100b (S116). The control unit 400 searches for an unconfirmed CH (S118).

If the four tuners 100 are not available (N of S100), the control unit 400 refers to the table stored in the storage unit 500, and selects two channels in use among the CHs whose status is “reconfirmation required”. It is checked whether there is a channel using one tuner 100 (S120). If there is a corresponding CH (Y of S122), the control unit 400 determines to use two tuners 100 other than the two tuners 100 in use for the corresponding CH (S126). If there is no corresponding CH (N of S122), or if there is an unconfirmed CH (Y of S124), the control unit 400 instructs the corresponding CH to use two tuners 100 other than the two tuners 100 in use. Determine (S126). If there is no unconfirmed CH (N of S124), the controller 400 fails (S128).

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

FIG. 6 is a flowchart showing the procedure of the third process in broadcast receiving apparatus 1000. As shown in FIG. The control unit 400 calculates the total value of the six sets (S200). The control unit 400 lists CHs whose status is "reconfirmation required" in the table stored in the storage unit 500 (S202). The control unit 400 selects the most common combination 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 greater than or equal to the first threshold value (Y of S208), control unit 400 determines the use of 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 of S208), control unit 400 deletes the two selected tuners 100 from the list (S210). If the list is not empty (N of S212), the process returns to step 204. If the list is empty (Y of S212), control unit 400 checks whether there is a combination of two tuners that is equal to or greater than the second threshold among the six sets of total values (S214). If there is such a combination (Y of S216), the control unit 400 determines the combination of two tuners with the minimum total value among the combinations that are equal to or greater than the second threshold (S218). If there is no such combination (N of S216), control unit 400 determines the combination of two tuners that provides the maximum total value (S220).

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

FIG. 7 is a flowchart showing another procedure of the third process in broadcast receiving apparatus 1000. In FIG. The control unit 400 calculates the total value of the six sets (S300). The control unit 400 lists CHs "with broadcast waves" in the table stored in the storage unit 500 (S302). Control unit 400 selects the most common combination of 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 greater than or equal to the first threshold value (Y of S308), control unit 400 determines the use of two tuners 100 corresponding to the total value (S322).

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

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

According to this embodiment, two unused tuners are used to perform a different tuner than the first channel while performing the first or third process on the first channel. Since the first processing is executed for two channels, the processing period can be shortened. In addition, when it is determined in the first process that there is a broadcast wave, the composite CNR is calculated using four tuners, so it is possible to suppress deterioration in the accuracy of listing broadcasting stations. Further, the number of times of use of the combination of two tuners used when it is determined that there is no broadcast wave is derived for each combination, and the two tuners other than the two tuners included in the combination with the largest number of times of use are selected in the first process. use, so reconfirmation can be performed efficiently. Further, when it is determined that there is no broadcast wave, the next first processing is executed by setting the first channel to two tuners other than the two tuners used. I can judge. 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. can be obtained.

In addition, the number of times of use of the combination of two tuners used when it is determined that there is no broadcast wave in the first process of the first time is derived for each combination, and the single CNR of the two tuners included in the combination with the largest number of times of use. is greater than or equal to the first threshold value, two tuners are selected, so that the possibility of obtaining broadcast station information in the third process can be improved. In addition, the number of times of use of the combination of two tuners used when it is determined that there is no broadcast wave in the first process of the first time is derived for each combination, and the single CNR of the two tuners included in the combination with the largest number of times of use. is greater than or equal to the first threshold value, two tuners are selected, so the second first process is executed for the other channel determined to have no broadcast wave in the first first process. can do

If the total value is smaller than the first threshold value, and if the total value of the single CNRs of the two tuners included in the combination with the next largest number of times of use is equal to or greater than the first threshold value, the two tuners are selected. Since it is selected, it is possible to improve the possibility of acquiring the broadcasting station information in the third process. If the total value is smaller than the first threshold value, and if the total value of the single CNRs of the two tuners included in the combination with the next largest number of times of use is equal to or greater than the first threshold value, the two tuners are selected. Since it is selected, it is possible to cause the second first process to be executed for other channels determined to have no broadcast wave in the first first process. 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 the processing period can be shortened.

Also, after calculating the total value of the individual CNRs of the two tuners included in each combination, the smallest total value among the total values equal to or greater than the second threshold is selected, and the selected total value is selected. Since the combination that does is used for the third process, it is possible to improve the possibility of acquiring the broadcast station information in the third process. Also, after calculating the total value of the individual CNRs of the two tuners included in each combination, the smallest total value among the total values equal to or greater than the second threshold is selected, and the selected total value is selected. Since the combination that does is used for the third process, it is possible to cause other channels to perform the first process. Also, when there is no total value equal to or greater 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 the third process can be executed.

The present invention has been described above based on the examples. It should be understood by those skilled in the art that this embodiment is merely an example, and that various modifications can be made to combinations of each component and each treatment process, and such modifications are within the scope of the present invention. .

As the third process, the control unit 400 in this embodiment executes (a) pattern 3-1 or (e) pattern 3-5, and then (b) pattern 3-2 to (d) pattern 3-4. perform at least one of However, not limited to this, 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 with a large single CNR can be used for the first processing for the second channel while enabling 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 Section 210 A/D Converter 220 Level Detector 230 Gain Control Section 240 Quadrature 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 composite CNR calculation unit 340 decoding unit 350 output unit 400 control unit 500 storage unit, 1000 broadcast receiver.

Claims (8)

n (an even number of n>=4) tuners each capable of receiving broadcast waves from broadcasting stations via different antennas;
a synthesizing unit connected to the n tuners and synthesizing signals output from the n/2 tuners;
a decoding unit that decodes the signal synthesized by the synthesizing unit;
By controlling the n tuners, the synthesizing section, and the decoding section, (1) a first process for determining the presence or absence of broadcast waves, and (2) it is determined that there are broadcast waves in the first process. a second process for calculating the composite CNR in the case of a
The control unit
(1) during the first processing, setting a first channel to n/2 tuners out of the n tuners, and synchronization is established in at least one of the n/2 tuners; If established, determine that there is a broadcast wave of the first channel,
(2) In the second processing, the n tuners are set to the first channel, the synthesizing unit synthesizes the signals output from the n tuners, and the n tuners are combined. calculating a single CNR for each of the tuners, calculating a combined CNR for the n tuners;
(3) in the third processing, setting the first channel to n/2 tuners selected based on the single CNR in each of the n tuners; causing the synthesizing unit to synthesize the signal output from the tuner and causing the decoding unit to perform decoding;
During the execution of the first process or the third process for the first channel, unused n/2 tuners are used to perform a different tuner than the first channel. 1. A broadcast receiving apparatus characterized by executing the first processing for two channels. The control unit is used when the first processing 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 processing The number of times of use of the n/2 tuner combinations is derived for each combination, and among the derived number of times of use for each combination, the n/2 tuners other than the n/2 tuners included in the combination with the largest number of times of use are derived. 2. A broadcast receiving apparatus according to claim 1, wherein two tuners are used in said first processing for said first channel. When it is determined that there is no broadcast wave in the first process for the first channel, the control unit switches the n/2 tuners other than the n/2 tuners used in the first process to the first channel. By setting the channel of the following first processing is executed,
3. The broadcast receiving apparatus according to claim 1, wherein said control unit causes said second process and said third process to be executed when it is determined that there is a broadcast wave in said next first process. . The control unit manages the status for each of a plurality of channels that can be set as the first channel and the second channel, and the status is determined to be no broadcast wave in the first processing for the first time. including reconfirmation required,
The control unit selects n/2 tuners used when it is determined that there is no broadcast wave in the first process when there is a channel with a status that requires reconfirmation during the third process. If the total value of single CNRs of n/2 tuners included in the combination with the largest number of times of use is equal to or greater than the threshold value, the n/2 tuners 4. The broadcast receiving apparatus according to any one of claims 1 to 3, characterized in that it selects . In the third processing, if the total value is smaller than the threshold value, the total value of single CNRs of n/2 tuners included in the combination with the next largest number of times of use is set to the threshold value. 5. The broadcast receiving apparatus according to claim 4, wherein if the number is equal to or greater than the value, the n/2 tuners are selected. When the processing for the first channel is completed and it is determined that there is a broadcast wave in the first processing for the second channel, the control unit performs the second processing for the second channel and the first processing for the second channel. 6. The broadcast receiving apparatus according to any one of claims 1 to 5, wherein 3 processes are executed in order. n (an even number of n>=4) tuners capable of receiving broadcast waves from broadcasting stations are connected to the n tuners via different antennas, and output from n/2 tuners (1) Presence or absence of broadcast waves (2) a second process for calculating a composite CNR when it is determined that there is a broadcast wave in the first process; (3) after deriving the composite CNR in the second process A broadcast receiving method in a broadcast receiving device comprising a control unit that sequentially executes a third process for acquiring broadcast station information,
When the first channel is set to n/2 tuners out of the n tuners during the first processing, and synchronization is established in at least one of the n/2 tuners a step of determining that there is a broadcast wave of the first channel;
In the second processing, the first channel is set to the n tuners, the synthesizing unit synthesizes the signals output from the n tuners, and each of the n tuners calculating the single CNR at and calculating the combined CNR of the n tuners;
During the third processing, setting the first channel to n/2 tuners selected based on the single CNR in each of the n tuners, and outputting from the n/2 tuners a step of synthesizing the signals obtained by the synthesizing unit and causing the decoding unit to perform decoding;
During the execution of the first process or the third process for the first channel, unused n/2 tuners are used to obtain a different tuner than the first channel. performing said first processing on two channels;
A broadcast receiving method comprising: n (an even number of n>=4) tuners capable of receiving broadcast waves from broadcasting stations are connected to the n tuners via different antennas, and output from n/2 tuners (1) Presence or absence of broadcast waves (2) a second process for calculating a composite CNR when it is determined that there is a broadcast wave in the first process; (3) after calculating the composite CNR in the second process A broadcast reception control program to be executed by a broadcast receiving apparatus comprising a control unit for sequentially executing a third process for acquiring broadcast station information,
When the first channel is set to n/2 tuners out of the n tuners during the first processing, and synchronization is established in at least one of the n/2 tuners a step of determining that there is a broadcast wave of the first channel;
In the second processing, the first channel is set to the n tuners, the synthesizing unit synthesizes the signals output from the n tuners, and each of the n tuners calculating the single CNR at and calculating the combined CNR of the n tuners;
During the third processing, setting the first channel to n/2 tuners selected based on the single CNR in each of the n tuners, and outputting from the n/2 tuners a step of synthesizing the signals obtained by the synthesizing unit and causing the decoding unit to perform decoding;
During the execution of the first process or the third process for the first channel, unused n/2 tuners are used to obtain a different tuner than the first channel. performing said first processing on two channels;
A broadcast reception control program characterized by causing a computer to execute

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