JP2018056938A - Broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast receiver that searches for broadcasts receivable by diversity reception in a short time without the omission of search.SOLUTION: If diversity reception quality QrD is good, a broadcast receiver determines that a channel during reception is a receivable channel, i.e. a frequency channel receivable normally, and if the diversity reception quality QrD is not good, it checks to see if an average value of reception quality Qr1 at a first tuner 103 and reception quality Qr2 at a second tuner 104 is good. If the average value is not good, it determines that a channel during reception is not a receivable channel. If the average value is good, it waits until a detection value of the diversity reception quality QrD becomes stable after the elapse of a prescribed period, and determines whether a channel during reception is a receivable channel from the diversity reception quality QrD.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a broadcast receiving apparatus that performs diversity reception of a broadcast such as a radio broadcast.

  As a technique for performing diversity reception of broadcasting such as radio broadcasting, the level of the reception signal having the lower reception level of the two reception signals received by the two antennas is set to the level of the reception signal having the higher reception level. There is known a technique of phase diversity reception that amplifies the signals so as to coincide with each other and combines the phases of the two received signals (for example, Patent Document 1).

  In addition, as a technique for performing diversity reception of a broadcast such as a radio broadcast, in a radio broadcast receiving apparatus provided with two sets of an antenna and a tuner, when the reception quality of the broadcast of the receiving broadcast station is poor, the antenna and When two sets of tuners are used for broadcast phase diversity reception, and the reception quality of the broadcast of the receiving broadcast station is good, one set of antenna and tuner is used for receiving the broadcast while the other set is used. Is known in the art for searching for other broadcasts that can be received in the background (for example, Patent Document 2).

  Here, with this technology, after starting phase diversity reception, the audio output is muted until stable and steady phase diversity reception can be performed, thereby outputting a constant quality sound to the user. It is deterring that it is done.

JP 2009-153033 A JP 2009-153033 A

  As described above, in a radio broadcast receiving apparatus that includes two sets of antennas and tuners and performs phase diversity reception, when searching for a receivable broadcast using one set of antennas and tuners, two sets of antennas and When phase diversity reception using a tuner is performed, search for a receivable broadcast may be missed.

  On the other hand, if search for receivable broadcasts is performed by phase diversity reception, the occurrence of such a search omission can be eliminated. However, prior to phase alignment and level adjustment of received signals received by the two antennas, respectively. Since stable and steady broadcast phase diversity reception is possible only after processing is performed, there is a problem that it takes a long time to search for other receivable broadcasts.

  Accordingly, an object of the present invention is to perform a search for a receivable broadcast in a short time without a search omission in a broadcast receiving apparatus that performs diversity reception.

  In order to achieve the above object, the present invention provides a broadcast receiving apparatus that receives a broadcast that is wirelessly transmitted using a broadcast channel, a first receiving means that receives the broadcast, and a second receiving means that receives the broadcast. A diversity receiver that performs diversity reception of the broadcast using the first receiver and the second receiver, and a first reception that detects a reception quality of the inspection channel by the first receiver as a first reception quality. A quality detection unit; a second reception quality detection unit that detects reception quality of the inspection channel by the second reception unit as second reception quality; and detection of reception quality of the diversity reception unit of the inspection channel as diversity reception quality Diversity reception quality detection unit and whether the inspection channel that is the inspection target broadcast channel is a receivable broadcast channel that can be received normally. It is obtained by a receivable broadcast channel detecting means for performing constant-determining process. However, the receivable broadcast channel determination means determines that the inspection channel is the receivable broadcast channel when the diversity reception quality of the inspection channel is better than a predetermined first level in the determination process. When the diversity reception quality of the inspection channel cannot be determined as the receivable broadcast channel in the first determination step, the first reception of the inspection channel is performed. A second determination that determines an evaluation value that comprehensively evaluates quality and the second reception quality and determines that the inspection channel is not the receivable broadcast channel when the evaluation value is lower than a predetermined threshold value; And execute steps.

  Here, in such a broadcast receiving apparatus, the receivable broadcast channel determination unit evaluates the first reception quality and the second reception quality of the inspection channel in a comprehensive manner in the second determination step. When the value is not lower than a predetermined threshold value, the inspection channel may be determined to be the receivable broadcast channel.

  Alternatively, in such a broadcast receiving apparatus, the receivable broadcast channel determination unit evaluates the first reception quality and the second reception quality of the inspection channel comprehensively in the second determination step. Is determined to be lower than a predetermined threshold value, the diversity reception quality of the check channel is checked again after a predetermined period of time, and the diversity reception quality of the check channel after the predetermined period of time is When the level is better than 1, the test channel is determined to be the receivable broadcast channel, and the diversity reception quality of the test channel after the predetermined period is not better than the first level You may comprise so that the 3rd determination step which determines that the said test | inspection channel is not the said receivable broadcast channel may be performed.

  Alternatively, in such a broadcast receiving apparatus, the receivable broadcast channel determination unit evaluates the first reception quality and the second reception quality of the inspection channel comprehensively in the second determination step. Is determined to be lower than a predetermined threshold value, the diversity reception quality of the check channel is monitored until a predetermined period elapses, and the diversity reception quality is the first channel before the predetermined period elapses. If it becomes better than the level, it is determined that the inspection channel is the receivable broadcast channel at that time, and the diversity reception quality does not become better than the first level before the predetermined period elapses The inspection channel may be determined not to be the receivable broadcast channel.

  In each of the above broadcast receiving apparatuses, the first level is, for example, the minimum value of the diversity reception quality level of the inspection channel that can guarantee that the diversity reception unit can normally receive the inspection channel. .

  In the broadcast receiving apparatus described above, the evaluation value obtained by comprehensively evaluating the first reception quality and the second reception quality of the inspection channel is an average of the first reception quality and the second reception quality. A value or the like can be used.

  Now, the broadcast receiving apparatus as described above searches for a broadcast channel that can normally receive the broadcast, and sets the searched broadcast channel as a use channel that is a broadcast channel that receives the broadcast and outputs audio to the user. A seek unit is provided, and in the seek unit, the receivable broadcast channel determination unit performs the determination process for each inspection channel while switching the broadcast channel as the inspection channel, and each broadcast channel is the receivable broadcast channel. The broadcast channel that is first detected as the receivable broadcast channel may be set as the use channel.

  The broadcast receiving apparatus includes a station list in which broadcast channels that can be normally received by the broadcast receiving apparatus are registered, and a scanning unit that creates the station list, and the inspection unit includes the inspection channel. The receivable broadcast channel determination means is made to perform the determination process for each inspection channel while switching the broadcast channel to detect whether each broadcast channel is the receivable broadcast channel, and the receivable broadcast A broadcast channel detected to be a channel may be registered in the station list.

Here, in the above broadcast receiving apparatus, the broadcast is, for example, a radio broadcast. Moreover, the above broadcast receiving apparatus may be a broadcast receiving apparatus mounted on an automobile.
According to the broadcast receiving apparatus as described above, by appropriately setting the first level and the threshold value, it is calculated before the arrival of a period during which it is guaranteed that the diversity reception quality is stably calculated. If it is clear from the diversity reception quality that the broadcast of the inspection channel can be normally received by diversity reception, or the comprehensive evaluation value of the first reception quality and the second reception quality of the inspection channel, If it is clear that the broadcast cannot be received normally, it is determined whether the inspection channel is a receivable broadcast channel without waiting for the arrival of a period in which the stability of diversity reception quality detection is guaranteed. Can do.

  In this broadcast receiving apparatus, the diversity reception quality calculated before the arrival of the period during which it is guaranteed that the diversity reception quality is stably calculated, the first reception quality and the second reception quality of the inspection channel. Even if it is not clear from the overall evaluation values of the diversity channel whether or not the broadcast of the inspection channel can be received normally by diversity reception, it is necessary to wait for the arrival of a period during which the stable detection of diversity reception quality is guaranteed. Whether or not the inspection channel is a receivable broadcast channel is determined from the reception quality.

Therefore, according to such a broadcast receiving apparatus, it is possible to search for a broadcast that can be received by the broadcast receiving apparatus that performs diversity reception in a shorter time and without omission of search.
In addition, the present invention also provides a broadcast receiving apparatus that receives a broadcast that is wirelessly transmitted using a broadcast channel, a first receiving means that receives the broadcast, a second receiving means that receives the broadcast, A diversity receiving unit that performs diversity reception of the broadcast using the first receiving unit and the second receiving unit, and a first reception quality detection that detects the reception quality of the inspection channel by the first receiving unit as the first reception quality A diversity reception unit that detects reception quality of the diversity reception unit of the check channel as diversity reception quality, a second reception quality detection unit that detects reception quality of the inspection channel by the second reception unit as second reception quality, Determine whether the reception quality detection unit and the inspection channel that is the broadcast channel to be inspected are receivable broadcast channels that can be received normally. It is obtained by a receivable broadcast channel detecting means for performing a constant process. Here, the receivable broadcast channel determination means determines that the inspection channel is the receivable broadcast channel when the first reception quality of the inspection channel is better than a predetermined level in the determination process. When the diversity reception quality of the inspection channel cannot be determined to be the receivable broadcast channel in the first determination step of determining and the first determination step, the first reception quality of the inspection channel and the first A second determination step of checking an evaluation value that comprehensively evaluates two reception qualities and determining that the inspection channel is not the receivable broadcast channel when the evaluation value is lower than a predetermined threshold; In the second determination step, an evaluation value obtained by comprehensively evaluating the first reception quality and the second reception quality of the inspection channel is a predetermined value. If the diversity reception quality becomes better than a predetermined first level by a predetermined period when it is determined that it is not lower than a predetermined value, it is determined that the inspection channel is the receivable broadcast channel. And a third determination step of determining that the inspection channel is not the receivable broadcast channel when the diversity reception quality does not become better than the first level before the predetermined period elapses.

  According to such a broadcast receiving apparatus, it is clear that the broadcast of the inspection channel can be normally received by diversity reception from the first reception quality by appropriately setting a predetermined level and threshold. If it is clear from the comprehensive evaluation values of the first reception quality and the second reception quality of the inspection channel that the broadcast of the inspection channel cannot be normally received by diversity reception, the detection of the diversity reception quality is stable. It is possible to determine whether the inspection channel is a receivable broadcast channel without waiting for the guaranteed period to arrive.

  In this broadcast receiving apparatus, it is not clear from the first reception quality or the comprehensive evaluation values of the first reception quality and the second reception quality whether the inspection channel broadcast can be normally received by diversity reception. Only when waiting for the arrival of a period during which the detection of diversity reception quality is guaranteed to be stable, using the first level, determining whether the inspection channel is a receivable broadcast channel from the diversity reception quality; Become.

  Therefore, according to such a broadcast receiving apparatus, it is possible to search for a broadcast that can be received by the broadcast receiving apparatus that performs diversity reception in a shorter time and without omission of search.

  As described above, according to the present invention, in a broadcast receiving apparatus that performs diversity reception, a search for a receivable broadcast can be performed in a short time without a search omission.

It is a block diagram which shows the structure of the radio broadcast receiver which concerns on embodiment of this invention. It is a flowchart which shows the seek process which concerns on embodiment of this invention. It is a figure which shows transition of the diversity reception quality which concerns on embodiment of this invention. It is a flowchart which shows the other example of the seek process which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows a configuration of a radio broadcast receiving apparatus according to this embodiment.
As illustrated, the radio broadcast receiving apparatus includes a first antenna 101, a second antenna 102, a first tuner 103 that receives a broadcast using the first antenna 101, and a second antenna that receives a broadcast using the second antenna 102. A tuner 104, a synthesis processing unit 105, a demodulation unit 106, an amplifier 107, a speaker 108, a control unit 109, an input device 110, a display device 111, and a memory 112 are provided.

  Here, in such a configuration, one frequency channel is selectively set as a reception channel in the first tuner 103 and the second tuner 104 by the control unit 109. Then, the first tuner 103 generates an IF signal of the reception channel from the RF signal received by the first antenna 101 and outputs it to the combining process, and the second tuner 104 receives the reception channel from the RF signal received by the second antenna 102. The IF signal is generated and output to the synthesis processing unit 105.

  Also, the first tuner 103 calculates the reception quality of the reception channel in the first tuner 103 as the reception quality Qr1 of the first tuner 103 based on S meter (signal strength), SN ratio, multipath distortion, etc. The second tuner 104 calculates the reception quality of the reception channel in the second tuner 104 as the reception quality Qr2 of the second tuner 104 based on the S meter (signal strength), the SN ratio, multipath distortion, and the like.

  Next, the synthesis processing unit 105 performs phase diversity synthesis that combines the IF signal input from the first tuner 103 and the IF signal input from the second tuner 104 after phase adjustment and gain adjustment, and the synthesized IF signal is combined. Output to the demodulator 106. Further, combining processing section 105 calculates the reception quality of the reception channel in combining processing section 105 as diversity reception quality QrD based on the signal strength of the combined IF signal.

  The synthesis processing unit 105 completes the above-described preprocessing such as phase adjustment, phase difference detection for gain adjustment, level detection, and the like, and can receive the reception channel by phase diversity synthesis. The guaranteed period during which the received diversity reception quality QrD can be assured is a period after a certain period of time has elapsed since the reception of the reception channel by the first tuner 103 and the second tuner 104. It becomes.

  Next, the demodulation unit 106 restores the sound from the IF signal input from the synthesis processing unit 105 and outputs the restored sound to the amplifier 107. The amplifier 107 amplifies the sound output from the receiving unit with the gain set by the control unit 109 and outputs the amplified sound from the speaker 108.

  In such a radio broadcast receiving apparatus, when the control unit 109 receives a channel selection operation from the user via the input device 110, the control unit 109 sets the frequency channel of the selected broadcast station as a reception channel. The tuner 103 and the second tuner 104 are set, and the synthesis processing unit 105 receives the broadcast of the selected broadcast station by phase diversity and outputs the sound from the speaker 108.

Hereinafter, the seek process performed by the control unit 109 will be described.
Here, the seek process is a process that starts when a seek instruction operation is received from the user via the input device 110. In addition, this seek process searches for a frequency channel that can be received satisfactorily while changing the frequency channel set as the receiving channel in the seek direction, receives the broadcast of the frequency channel that can be searched first, and the audio of the received broadcast This is a process for starting output from the speaker 108. The seek direction is a direction instructed by a seek instruction operation, and is either a direction in which the frequency increases or a direction in which the frequency decreases.

FIG. 2 shows the procedure of this seek process.
As shown in the figure, in this process, first, the amplifier 107 is controlled to mute the output of the sound to the speaker 108 (step 202).
Then, the frequency channel set in the first tuner 103 and the second tuner 104 is changed to a frequency channel adjacent in the seek direction to the frequency channel currently set in the first tuner 103 as a reception channel (step 204). . Here, in radio broadcasting, a frequency channel can be assigned to a frequency that is an integer multiple of a predetermined unit frequency interval with respect to a predetermined reference frequency within a broadcasting frequency band of the radio broadcasting. The frequency channel adjacent to the frequency channel set in the first tuner 103 in the seek direction is more than the frequency channel set in the first tuner 103 if the seek direction is a direction that increases the frequency. If the frequency channel has a large frequency for the unit frequency interval and the seek direction is a direction to decrease the frequency, the frequency channel has a frequency that is smaller by the unit frequency interval than the frequency channel set in the first tuner 103. is there.

  Now, if the frequency channels set in the first tuner 103 and the second tuner 104 are changed, a predetermined time T1 (T1 is 10 ms, for example) is waited for (step 206). Diversity reception quality QrD calculated by unit 105 is acquired, and it is checked whether diversity reception quality QrD is better than threshold value ThGD (step 208).

  Here, as the predetermined time T1, reception of a new reception channel is started by the first tuner 103 and the second tuner 104, and then reception by the first tuner 103 and the second tuner 104 is stabilized, and reception quality Qr1, Set the time required for stable calculation of Qr2. As the threshold ThGD, a minimum value of the reception quality QrD that ensures that the broadcast can be normally received by phase diversity reception is set.

  If the diversity reception quality QrD is better than the threshold ThGD (step 208), the audio output mute is canceled (step 210), and the diversity received audio is output from the speaker 108. Then, the seek process ends.

  Here, the time required until an approximately stable value is detected as the diversity reception quality QrD varies depending on the reception qualities Qr1 and Qr2 and the synthesis algorithm for phase diversity reception.

  For example, the phase diversity reception combining algorithm sets the ratio of the initial state of the IF signal component of the first tuner 103 and the IF signal component of the second tuner 104 included in the IF signal output from the combining processing unit 105 to the first value. When the IF signal component of the tuner 103 is assumed to be 100% and the ratio of the IF signal component of the second tuner 104 included in the IF signal output from the synthesis processing unit 105 is gradually increased until the optimum ratio is reached. As shown in FIG. 3a, when the reception quality Qr1 is good, a good value as the diversity reception quality QrD is immediately detected as an approximately stable value, while shown in FIG. 3b. Thus, when the reception quality Qr1 is not good and the reception quality Qr2 is good, a good value is detected immediately as the diversity reception quality QrD. , Good value and thus takes a relatively long time to become to be stably detected.

  Regardless of the synthesis algorithm, in general, when the difference between the reception quality Qr1 and Qr2 is small, the time required until an approximately stable value is detected as the diversity reception quality QrD is short, and the reception quality Qr1 If the difference in Qr2 is large, there may be a case where it takes a long time until a stable value is detected as the diversity reception quality QrD. Therefore, it is unlikely that the diversity reception quality QrD will deteriorate, and in any case, if a good value is detected as the diversity reception quality QrD before reaching the guarantee period described above, the diversity reception quality QrD A stable value of can be considered good.

  Therefore, even before the guarantee period described above is reached, if it is detected in step 208 that the diversity reception quality QrD is better than the threshold value ThGD, the frequency at which the inspection channel can receive broadcasts satisfactorily. Since it can be considered as a channel, the correct seek processing is completed by causing the speaker 108 to output the voice diversity-received from the reception channel at that time.

  On the other hand, if it is determined in step 208 that the diversity reception quality QrD is not better than the threshold ThGD, the reception quality Qr1 of the first tuner 103 and the second tuner 104 calculated by the first tuner 103 are calculated. The reception quality Qr2 and the combined value QrM of the second tuner 104 that is being operated are calculated (step 212).

  Here, as the combined value QrM, a value representing a comprehensive evaluation of the first reception quality Qr1 and the second reception quality Qr2 is used. That is, for example, as the combined value QrM, the reception quality Qr1 of the first tuner 103, the reception quality Qr2 of the second tuner 104, and the average value are used.

Then, it is checked whether or not the calculated composite value QM is better than the threshold value ThGM (step 214). If not, the process returns to step 204.
Here, as the threshold value ThGM, the highest value of the combined value QrM that ensures that the broadcast cannot be received normally even when phase diversity reception is performed is set. More specifically, for example, when the reception quality Qr1 of the first tuner 103, the reception quality Qr2 of the second tuner 104, and the average value are used as the combined value QrM, the threshold ThGM is the threshold described above. Predetermined from a value obtained by subtracting a predetermined margin from the same value as the value ThGD, or the minimum value of the reception quality Qr1 that ensures that the broadcast can be normally received by the single reception of the first tuner 103 without performing phase diversity reception. A value obtained by subtracting the margin can be used.

  On the other hand, if the calculated composite value QM is better than the threshold value ThGM (step 214), the process waits for a predetermined time T2 (T2 is 40 ms, for example) (step 216), and if the predetermined time T2 has elapsed. Then, it is checked whether or not the diversity reception quality QrD calculated by the synthesis processing unit 105 is better than the threshold value ThGD (step 218). If not, the process returns to step 204.

  Here, as the predetermined time T2, new reception is performed by the first tuner 103 and the second tuner 104 until the start of the above-described guarantee period, which is a period during which it is possible to guarantee that the diversity reception quality QrD is stably calculated. A time is set by subtracting the above-described time T1 from the elapsed time from the start of channel reception.

  That is, for example, as shown in FIG. 3b, after reception of a new reception channel is started by the first tuner 103 and the second tuner 104, reception by the first tuner 103 and the second tuner 104 is stabilized and received. If the time required for stable calculation of quality Qr1 and Qr2 is 10 ms, 10 ms is set as time T1, diversity reception in the synthesis processing unit 105 is stable, and diversity reception quality QrD is calculated stably. If the elapsed time from the start of reception of a new reception channel by the first tuner 103 and the second tuner 104 until the start of the above-described guarantee period, which is a period during which it can be guaranteed, is 50 ms. T2 is set to 40ms obtained by subtracting time T1 from 50ms.

  On the other hand, if the diversity reception quality QrD is better than the threshold value ThGD (step 218), the audio output mute is canceled (step 210), and the diversity received audio is output from the speaker 108.

Then, the seek process ends.
The seek process performed by the control unit 109 has been described above.
The embodiment of the present invention has been described above.
As described above, according to the present embodiment, it is clear that the broadcast of the reception channel can be normally received from the diversity reception quality QrD before the arrival of the period during which it is guaranteed that the calculation is stable. When it is clear from the combined value QrM of the reception quality Qr1 and the second reception quality Qr2 that the reception channel broadcast cannot be received normally even by diversity reception, the diversity reception quality QrD is stably calculated. It is determined whether or not the receiving channel is a receivable broadcast channel without waiting for the period for which the

  Then, the diversity reception quality QrD before the arrival of a period during which it is guaranteed to be stably calculated, and the combined value QrM of the first reception quality Qr1 and the second reception quality Qr2, can be used to broadcast the reception channel. Only when it is not clear whether it can be received normally or not, it waits for the arrival of a period during which it is guaranteed that the diversity reception quality QrD is stably calculated, and broadcasts the reception channel from the diversity reception quality QrD normally. It is determined whether or not it can be received.

Therefore, according to the present embodiment, a search for a receivable broadcast channel can be performed in a shorter time and without a search omission.
By the way, in step 208 of the seek process in the above embodiment, it is checked whether or not the reception quality Qr1 is better than the predetermined threshold value ThG1, and if good, the process proceeds to step 210, and if not good, the process goes to step 212. It is good also as a process to advance. Here, in this case, the threshold value ThG1 is set to the lowest value of the reception quality Qr1 at which broadcast can be received by the single reception of one tuner regardless of the phase diversity reception. Here, when a single tuner can receive a broadcast alone, the broadcast can also be received by phase diversity reception, so in this way also in step 208, it is determined that phase diversity reception is possible. be able to.

  In the above seek process, if it is determined in step 214 that the composite value QM calculated in step 212 is better than the threshold value ThGM, the process proceeds to step 210 as it is to cancel the mute of the audio output. (Step 212), the diversity received voice may be output from the speaker 108, and the seek process may be terminated.

  Alternatively, as shown in FIG. 4, in the above seek process, when it is determined in step 214 that the composite value QM calculated in step 212 is better than the threshold value ThGM, the above-described time T2 is set as the timeout time. Is started (step 302), and before the diversity reception quality QrD becomes better than the threshold ThGD (step 304), if the timer times out (step 306), the processing from step 204 is started. Returning, if the diversity reception quality QrD becomes better than the threshold ThGD before the timer times out (step 306) (step 304), the process proceeds to step 2102 to unmute the audio output and The received sound may be output from the speaker 108 and the seek process may be terminated.

  In the above embodiment, the frequency channel that can be received satisfactorily while changing the frequency channel set as the reception channel in the increasing direction or the decreasing direction is searched, and reception and reception of the frequency channel broadcast that can be searched first. The seek processing for starting the output of the broadcast audio from the speaker 108 has been described. According to the reception quality Qr1 / Qr2 and the diversity reception quality QrD detected by the first tuner 103 and the second tuner 104 described above, The technology for determining whether or not frequency channel broadcasts can be received can be similarly applied to detection of whether or not frequency channel broadcasts can be received in various applications such as various searches and various scans.

  For example, in a radio broadcast receiving apparatus, when the radio broadcast receiving apparatus is not used by a user, that is, when sound received from a broadcast is not output from the speaker 108 via the amplifier 107, the background is good. It is also possible to search for a frequency channel capable of receiving broadcasts, and to perform a scanning process for registering the searched frequency channel list in the memory 112 as a station list. The station list is a list used for selecting a broadcast channel of the user.

  Here, in this scanning process, the control unit 109 receives, for example, changing the frequency channel set as the reception channel in the first tuner 103 and the second tuner 104 at a unit frequency interval in the broadcast frequency band of the broadcast. The following processing is performed for each frequency channel set as a channel.

  That is, after waiting for the elapse of the predetermined time T1, the diversity reception quality QrD is checked whether the reception quality is better than the threshold ThGD or whether the reception quality Qr1 is better than the threshold ThG1, If the reception quality is good, the frequency channel set as the reception channel is registered in the station list, and the process proceeds to the next frequency channel. On the other hand, if the diversity reception quality QrD is not better than the threshold ThGD, the reception quality Qr1 of the first tuner 103, the reception quality Qr2 of the second tuner 104 calculated by the second tuner 104, and the combined value QrM are calculated. . If the combined value QM is not better than the threshold value ThGM, the process immediately proceeds to the process for the next frequency channel. On the other hand, if the combined value QM is better than the threshold value ThGM, it is checked whether or not the diversity reception quality QrD is better than the threshold value ThGD after the elapse of the predetermined time T2 described above or until the elapse of time. If the diversity reception quality QrD is not better than the threshold ThGD when the predetermined time T2 has elapsed, the processing proceeds to the next frequency channel. On the other hand, if the diversity reception quality QrD is better than the threshold ThGD before or after the elapse of the predetermined time T2, the frequency channel set for the reception channel is registered in the station list and the next frequency is set. Proceed to processing for the channel.

  However, even in this scanning process, if the combined value QM is better than the threshold value ThGM, the frequency channel set as the receiving channel unconditionally is registered in the station list, and the next frequency channel is checked. You may make it progress to the process of.

  In the above embodiment, the application to a broadcast receiving apparatus that receives a radio broadcast has been described as an example. However, in the present embodiment, a technique for determining a frequency channel capable of receiving a broadcast satisfactorily is described in this embodiment. The present invention can be similarly applied to a broadcast receiving apparatus that receives an arbitrary broadcast such as a broadcast receiving apparatus that receives a TV broadcast.

  DESCRIPTION OF SYMBOLS 101 ... 1st antenna, 102 ... 2nd antenna, 103 ... 1st tuner, 104 ... 2nd tuner, 105 ... Composition processing part, 106 ... Demodulation part, 107 ... Amplifier, 108 ... Speaker, 109 ... Control part, 110 ... Input device, 111... Display device, 112.

Claims (11)

A broadcast receiving apparatus for receiving a broadcast transmitted wirelessly using a broadcast channel,
First receiving means for receiving the broadcast;
Second receiving means for receiving the broadcast;
A diversity receiver for performing diversity reception of the broadcast using the first receiver and the second receiver;
A first reception quality detection unit that detects reception quality of the inspection channel by the first reception unit as first reception quality;
A second reception quality detection unit that detects reception quality of the inspection channel by the second reception unit as second reception quality;
A diversity reception quality detection unit that detects reception quality of the diversity reception unit of the inspection channel as diversity reception quality;
Receivable broadcast channel determination means for performing determination processing to determine whether the inspection channel that is the inspection target broadcast channel is a receivable broadcast channel that can be normally received;
In the determination process, the receivable broadcast channel determination means
Performing a first determination step of determining that the inspection channel is the receivable broadcast channel when the diversity reception quality of the inspection channel is better than a predetermined first level;
When the diversity reception quality of the inspection channel cannot be determined to be the receivable broadcast channel in the first determination step, the first reception quality and the second reception quality of the inspection channel are comprehensively determined. The broadcast reception characterized by examining the evaluated evaluation value and executing a second determination step of determining that the inspection channel is not the receivable broadcast channel when the evaluation value is lower than a predetermined threshold value. apparatus. The broadcast receiving device according to claim 1,
The receivable broadcast channel determination means, in the second determination step, an evaluation value obtained by comprehensively evaluating the first reception quality and the second reception quality of the inspection channel is not lower than a predetermined threshold value. In this case, it is determined that the inspection channel is the receivable broadcast channel. The broadcast receiving device according to claim 1,
The receivable broadcast channel determination means includes
In the second determination step, when it is determined that an evaluation value obtained by comprehensively evaluating the first reception quality and the second reception quality of the inspection channel is not lower than a predetermined threshold value,
The diversity reception quality of the inspection channel is checked again after a predetermined period of time. When the diversity reception quality of the inspection channel after the predetermined period of time is better than the first level, the inspection channel can be received. Third determination step that determines that the check channel is not a receivable broadcast channel when the diversity reception quality of the check channel is not better than the first level after determining that the channel is a broadcast channel. The broadcast receiving apparatus characterized by performing. The broadcast receiving device according to claim 1,
The receivable broadcast channel determination means includes
In the second determination step, when it is determined that an evaluation value obtained by comprehensively evaluating the first reception quality and the second reception quality of the inspection channel is not lower than a predetermined threshold value, a predetermined period The diversity reception quality of the inspection channel is monitored until the time elapses, and if the diversity reception quality becomes better than the first level before the predetermined period elapses, the inspection channel receives the broadcast that can be received at that time. A third determination step that determines that the check channel is not the receivable broadcast channel when the diversity reception quality does not become better than the first level before the predetermined period of time elapses. A broadcast receiving apparatus characterized by being executed. A broadcast receiving apparatus for receiving a broadcast transmitted wirelessly using a broadcast channel,
First receiving means for receiving the broadcast;
Second receiving means for receiving the broadcast;
A diversity receiver for performing diversity reception of the broadcast using the first receiver and the second receiver;
A first reception quality detection unit that detects reception quality of the inspection channel by the first reception unit as first reception quality;
A second reception quality detection unit that detects reception quality of the inspection channel by the second reception unit as second reception quality;
A diversity reception quality detection unit that detects reception quality of the diversity reception unit of the inspection channel as diversity reception quality;
Receivable broadcast channel determination means for performing determination processing to determine whether the inspection channel that is the inspection target broadcast channel is a receivable broadcast channel that can be normally received;
In the determination process, the receivable broadcast channel determination means
A first determination step of determining that the inspection channel is the receivable broadcast channel when the first reception quality of the inspection channel is better than a predetermined level;
When the diversity reception quality of the inspection channel cannot be determined to be the receivable broadcast channel in the first determination step, the first reception quality and the second reception quality of the inspection channel are comprehensively determined. A second determination step of checking the evaluated evaluation value and determining that the inspection channel is not the receivable broadcast channel when the evaluation value is lower than a predetermined threshold;
In the second determination step, when it is determined that an evaluation value obtained by comprehensively evaluating the first reception quality and the second reception quality of the inspection channel is not lower than a predetermined threshold value, a predetermined period If the diversity reception quality is better than a predetermined first level before the elapse of time, it is determined that the inspection channel is the receivable broadcast channel, and the diversity reception quality is And a third determination step of determining that the inspection channel is not the receivable broadcast channel when it is not better than the first level. The broadcast receiving device according to claim 1, 2, 3, 4 or 5,
The broadcast receiving apparatus according to claim 1, wherein the first level is a minimum value of the diversity reception quality level of the inspection channel that can guarantee that the diversity reception unit can normally receive the inspection channel. The broadcast receiving device according to claim 1, 2, 3, 4, 5 or 6,
An evaluation value obtained by comprehensively evaluating the first reception quality and the second reception quality of the inspection channel is an average value of the first reception quality and the second reception quality. apparatus. The broadcast receiving device according to claim 1, 2, 3, 4, 5, 6 or 7,
Searching for a broadcast channel that can normally receive a broadcast, and setting the searched broadcast channel to a use channel that is a broadcast channel that receives the broadcast and outputs audio to the user;
The seek means allows the receivable broadcast channel determination means to perform the determination process for each inspection channel while switching the broadcast channel as the inspection channel, and whether each broadcast channel is the receivable broadcast channel or not. And a broadcast channel first detected as being a receivable broadcast channel is set as the use channel. The broadcast receiving device according to claim 1, 2, 3, 4, 5, 6, 7 or 8.
A station list in which broadcast channels that can be normally received by the broadcast receiving apparatus are registered;
Scanning means for creating the station list,
The scanning unit causes the receivable broadcast channel determination unit to perform the determination process for each inspection channel while switching the broadcast channel as the inspection channel, and whether each broadcast channel is the receivable broadcast channel or not. And a broadcast channel detected to be a receivable broadcast channel is registered in the station list. The broadcast receiving device according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9,
The broadcast receiving apparatus, wherein the broadcast is a radio broadcast. The broadcast receiving device according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 11,
The broadcast receiving apparatus is a broadcast receiving apparatus mounted on an automobile.