JP5125692B2 - Broadcast receiver - Google Patents

Description

The present invention relates to, for example, RDS (Radio Data System) broadcast receiver corresponding to the broadcast, such as.

Patent Document 1 discloses an RDS receiver. The RDS receiver is equipped with two tuner sections, a main and a sub, and when the electric field strength of the RDS broadcast being selected by the main tuner section is lower than a threshold value, the output from the speaker is transmitted to the main tuner section. In addition to fixing to the RDS broadcast being selected, the sub-tuner seeks for the alternative frequency broadcast. In the sub-tuner, the electric field strength is a predetermined value or more and the same program as the program being selected in the main tuner If the RDS broadcast that is being broadcast is found, the tuning of the main tuner is switched to the found RDS broadcast (41 NO → 50 YES → 51 YES → 52 in FIG. 3 of Patent Document 1).
JP-A-5-75397

  Extraction of data included in the RDS broadcast signal must be further time-consuming after the FM demodulation process and further through the RDS demodulation process. In the RDS receiver of Patent Document 1, the sub tuner unit is tuned to the frequency of the alternative RDS broadcast, and the identifier data of the program currently being broadcast in the alternative RDS broadcast is extracted, and the identifier of the identifier data and the main tuner unit are extracted. Since the main tuner unit is switched to the alternative RDS broadcast after checking that the identifier of the program currently being broadcast matches, the quality of the RDS broadcast being selected by the main tuner unit is lowered before the alternative tuner is switched to the alternative RDS broadcast. The time until switching is extended, and the output period of low-quality RDS broadcasting is prolonged.

An object of the present invention is to provide a broadcast receiver capable of shortening the switching time when it is necessary to switch to a broadcast that is currently being output and to another broadcast that is broadcasting the same program.

A broadcast that is currently being output as a program (program) is called a first broadcast, and a broadcast with an alternative frequency acquired from alternative frequency data of the first broadcast is called a second broadcast. The present invention in order to solve the above problems, the data extracting means for extracting the alternative frequency data from the received signal together with the identifier data for the program the broadcast is currently being broadcast for broadcasting, currently the program, the broadcast being output the first is called the broadcast, the first broadcast and respective first and second tuner section in the second broadcast search period broadcasting alternative frequency obtained from the alternative frequency data in the first broadcast call it the second broadcast tuning control means for using the output of the first tuner section causes tuned the second broadcast program output, the first broadcast quality detection means for detecting the quality of the received signal of the first broadcast, the reception signal of the second broadcast Second broadcast quality detecting means for detecting the quality of the first broadcast, and the quality of the received signal of the first broadcast is lower than the first level and the quality of the received signal of the second broadcast is higher than the first level and the latest past Constant Identifiers of data for the second broadcast when it is identical to the program identifier Okunaka release current in the first broadcast, the row of the first broadcast updates for the second broadcast in the first broadcasting extracted in between The first broadcast update means includes the first broadcast update means, and after the second broadcast is changed to the first broadcast, the identifier of the current identifier data of the second broadcast does not match the identifier of the identifier data of the first broadcast. When it is found that there is a broadcast receiver, the first broadcast is returned to the one before update .

In order to solve the above problems, the present invention provides a data extracting means for extracting alternative frequency data together with identifier data for a program that is currently being broadcast from a received signal for the broadcast, and a program that is currently outputting the program. the first is called the broadcast, the respective broadcast alternative frequencies obtained from the alternative frequency data of the first broadcast in the second second broadcast search period to be referred to as a broadcast on the first and second switch Yuna section 1 Channel selection control means for selecting the broadcast and the second broadcast and using the output of the first tuner unit for program output, the first broadcast quality detection means for detecting the quality of the received signal of the first broadcast , and the second broadcast Second broadcast quality detection means for detecting the quality of the received signal, and the quality of the received signal of the first broadcast is less than the first level, and the quality of the received signal of the second broadcast is greater than or equal to the first level and most recently Past past Identifier of identifier data for the second broadcast when it is identical to the program identifier being broadcast by the first broadcast, a first broadcast updates for the second broadcast in the first broadcasting extracted in between First broadcast update means, wherein the data extraction means extracts genre data for a currently broadcast program from a received signal for broadcast, and the first broadcast update means determines the length of the past certain period as a genre. Provided is a broadcast receiver that is adjusted based on the genre of data .

  According to the present invention, the current program identifier of the second broadcast is extracted if the program identifier extracted in the most recent fixed period for the second broadcast of the alternative frequency matches the current program identifier of the first broadcast. Therefore, since the second broadcast is immediately changed to the first broadcast, the program output can be promptly switched to the second broadcast in response to the deterioration of the quality of the first broadcast. Further, since the program identifier of the second broadcast to be compared with the current program identifier of the first broadcast is that of the program that the second broadcast has been broadcast for the most recent fixed period, the current identifier of the first broadcast And the success rate of switching to the second broadcast can be ensured to be sufficiently high.

  FIG. 1 is a block diagram of diversity RDS radio 10. Diversity RDS radio 10 is typically mounted on a vehicle and includes a main tuner unit 12a and a sub tuner unit 12b. Since the main tuner unit 12a and the sub tuner unit 12b have the same configuration, the numerals of the corresponding elements of the main tuner unit 12a and the sub tuner unit 12b are the same, and the subscripts are a and b, respectively. Will be described only for the main tuner unit 12a.

  RDS broadcast radio waves are captured by the antenna 15a and supplied as an RF signal from the antenna 15a to the F / E (front end) 16a. The F / E 16a converts the RF signal of the frequency of the RDS station that has been instructed by the control unit 29 into an IF signal. The IF signal from the amplifier 17a is amplified by the amplifier 17a and then supplied to an ADC (Analog / Digital Converter) 18a. The ADC 18a converts the signal from an analog format to a digital format and is supplied to the IF filter 19a.

  The IF filter 19a extracts a frequency band component corresponding to the control signal from the control unit 29 from the digital signal from the ADC 18a, and sends it to the FM demodulator 20a. The FM demodulator 20a performs FM demodulation processing on the IF signal, and the FM demodulated signal is supplied to the reception status detector 21a, the RDS demodulator 22a, and the FM processor 23a. The reception status detector 21a detects the quality of the reception status of the RDS broadcast selected by the F / E 16a based on, for example, the electric field strength of the received signal of the RDS broadcast.

  The RDS demodulator 22a further performs various processes such as RDS demodulation / synchronization and error correction on the FM demodulated signal from the FM demodulator 20a, so that the RDS broadcast received signal is included together with the audio signal. Extract data from the data signal. The data includes, for example, PI (program identifier), PS (broadcast station name display), PTY (genre identification code), EON (other network information = alternative frequency information), TP (traffic information broadcast presence / absence information) , TA (information on whether traffic information is being broadcast), RT (character data up to 64 characters), and CT (clock information).

  The control unit 29 determines the reception status, RDS demodulated data, RDS demodulation quality, and the like based on the input signals from the reception status detector 21a and the RDS demodulator 22a, and mutes, stereo blends, the FM processor 23a based on the determination result. Give instructions on high-cut and de-emphasis. The output of the FM processor 23a is supplied to the output selector 30.

  The output selector 30 selects an input from either the main tuner unit 12 a or the sub-tuner unit 12 b based on a control signal from the control unit 29 and sends it to a DAC (digital / analog converter) 31. The DAC 31 converts the digital audio signal from the output selector 30 into an analog audio signal and sends the analog audio signal to the speaker 32. The speaker 32 converts the input audio signal into audio and outputs it.

  FIG. 2 is a flowchart of an RDS radio control method 45 applied to the diversity RDS radio 10 of FIG. The RDS radio control method 45 is implemented in the control unit 29 of the diversity RDS radio 10. S46 and S47 relate to processing of a period in which AF (Alternative Frequency) search is not performed, that is, a diversity period. During the diversity period, the main tuner unit 12a and the sub tuner unit 12b select the same RDS broadcast.

  In S46, the reception state of the RDS broadcast being selected is monitored by the main tuner unit 12a and the sub tuner unit 12b. Since S46 and S47 are diversity periods, the RDS broadcasts currently selected by the main tuner unit 12a and the sub tuner unit 12b are the same. Specifically, the reception state of the RDS broadcast refers to the quality of the received signal of the RDS broadcast. The higher the quality of the received signal, the higher the quality of audio from the speaker 32 related to the received signal. The quality of the received signal is such that, for example, the higher the RSSI (Receiving Signal Strength Indicator) of the received signal detected by the reception status detectors 21a and 21b, or the error rate detected by the RDS demodulators 22a and 22b. The lower, the higher.

  In S47, the output selector 30 selects the output of the main tuner unit 12a and the sub-tuner unit 12b that has the better reception state (reception signal quality) for the reception signal, and the audio related to the audio signal is sent from the speaker 32. .

  In S48, it is determined whether or not an AF (alternative frequency) search is performed. If the determination is positive, the process proceeds to S49, and if not, the process returns to S46. When performing an AF search, for example, (a) during the diversity period, when the quality of the higher received signal quality of the antennas 15a and 15b falls below a predetermined level A1, (b) both the antennas 15a and 15b Can be set when the quality of the received signals is both lower than the predetermined level A2, or when (c) a predetermined time or more has elapsed since the previous AF search.

  In S49, the tuning of the tuner unit that is not selected by the output selector 30 among the outputs of the main tuner unit 12a and the sub-tuner unit 12b, that is, the tuner unit with the lower received signal quality, is selected as the AF station (alternative frequency). Station). Here, the RDS broadcast station before the AF station switching, that is, the RDS broadcast station that has received diversity is referred to as “original station”.

  In S50, the reception state of the RDS broadcast in the main tuner unit 12a and the sub tuner unit 12b is monitored. In S51, it is determined whether the reception quality of the original station, that is, the quality of the reception signal of the original station is equal to or less than a certain value. If the determination is positive, the process proceeds to S52, and if not, the process proceeds to S65.

  When the process proceeds from S51 to S52, since the quality of the received signal of the original station is deteriorated, if there is a preferable AF station, the output from the speaker 32 needs to be switched to the audio of the AF station. Accordingly, in the subsequent S52 to S55, processing corresponding thereto is performed.

  When the process proceeds from S51 to S65, the output from the speaker 32 is switched from the original station program to the AF station program in S67 described later via S65. The switching in S67 is switching after confirming the PI (Program Identity) code of the current program of the AF station in S66. At this time, the original station before switching becomes the AF station after switching. Therefore, the PI code can be added to the AF list information in association with the AF station. Since the AF list information is referred to when the reception status of the original station deteriorates and the PI code within a certain past time is used in S53 and S54, the received signal quality of the original station is good. First, switching to the AF station can be used to update and enrich the AF list information.

  When the process proceeds from S51 to S65, since the quality of the received signal of the original station is good, only the PI code is added to the AF list information, and switching to the AF station in S67 may be omitted. If NO in S51, the process may return to S46 immediately without proceeding to S65.

  In S52, it is determined whether or not the quality of the received signal from the AF station is equal to or higher than a certain value. If the determination is NO, the process returns to S46 because it is meaningless to switch to the AF station if the quality of the received signal from the AF station is poor. In S52, the constant value that is compared with the quality of the received signal of the AF station is generally slightly higher than the constant value that is compared with the quality of the received signal of the original station in S51.

  In S53, the AF station determines whether the program has been received within the past fixed time and has been output from the speaker 32. If the determination is positive, the process proceeds to S54. If there is, the process proceeds to S66. In the determination in S53, the AF list is referred to. In the AF list, AF stations received and output within a certain past time, PI code at that time, and reception time are recorded in association with each other. The AF list can also record the received field strength of the AF station at that time, and sort the AF stations by the received field strength. In the determinations of S53 and S54, the corresponding AF stations can be selected in s55 by comparing in order from those of the AF stations having the highest received electric field strength.

  The past fixed time is, for example, about ten minutes in consideration of the movement of the automobile on which the diversity RDS radio 10 is mounted. If the AF station in S53 is an AF station that has output a program from the speaker 32, the PI code of the program is extracted at that time, so that the next determination in S54 is possible. Note that the diversity RDS radio 10 stores the PI code of a program of the RDS broadcast station output from the speaker 32 for a predetermined time or more.

  In S54, it is determined whether or not the PI code of the program extracted from the received signal when the AF station outputs the program from the speaker 32 within the past certain time and the PI code of the current program of the original station match. If the determination is positive and the determination is positive, the process proceeds to S55, and if not, the process proceeds to S66.

  In S55, the input selection in the output selector 30 is switched to the tuner unit that selects the AF station in the main tuner unit 12a and the sub tuner unit 12b. In order to extract the PI code of the program currently being broadcast in the AF station, RDS demodulation processing in the RDS demodulator 22a or 22b is necessary, and this processing takes time. However, switching from the original station to the AF station for the output program in S55 is performed without determining whether the PI code of the program currently broadcast at the AF station matches the PI code of the program currently broadcast at the original station. That is, it is carried out without waiting for the extraction of the PI code of the program currently being broadcast at the AF station. Therefore, when the output quality of the original station program from the speaker 32 deteriorates, it is possible to quickly switch to the AF station program. Further, the AF station is an AF station that has been selected in the past fixed time, and only when the PI code at that time matches the PI code of the current program of the original station, the output from the speaker 32 is output from the AF station. Since switching to a program is performed, switching to an AF station that does not match a program is sufficiently avoided by appropriately setting a certain past time.

  In S55, the tuning of the tuner unit that has not selected the AF station in the main tuner unit 12a and the sub-tuner unit 12b is also switched to the AF station, and the process returns to S46. That is, after switching the diversity RDS radio 10 to diversity reception, the process returns to S46.

  In S65, it is determined whether or not the quality of the received signal of the AF station is a certain value or higher. If the determination is positive, the process proceeds to S66, and if not, the process returns to S46. The constant value in S65 may be set to be the same as the constant value determined in S51 for the quality of the received signal of the original station, or may be set to a value equal to the current quality of the received signal of the original station. In the former case, output switching from the speaker 32 from the original station to the AF station in S67 is performed in a period in which the received signal satisfies the reference quality as a constant value in both the original station and the AF station. On the other hand, in the latter case, the output switching from the speaker 32 from the original station to the AF station in S67 is related to whether or not the received signals of the original station and the AF station satisfy the reference quality as a constant value. If the quality of the received signal of the AF station is higher than the quality of the received signal of the original station, the process is performed.

  In S66, it is determined whether or not the PI code extracted from the received signal of the AF station for the program currently being broadcast at the AF station matches the PI code of the program currently being broadcast at the original station. If not, the process proceeds to S67. If not, the process proceeds to S70. As described above, it takes time (eg, several hundreds msec) to extract the PI code from the received signal of the RDS broadcast, and the PI code is in an undetermined state until the processing is completed. This determination is negative.

  In S67, as in S55, the input selection in the output selector 30 is switched to the one that selects the AF station in the main tuner unit 12a and the sub tuner unit 12b. After switching, the process proceeds to S46.

  In S70, after starting the tuning of the AF station in one tuner unit in S49, it is determined whether or not a certain time has passed. If the determination is positive, the process proceeds to S71, and if not, the process proceeds to S66. Return. The fixed time in S70 is a time required for the extraction process of the PI code from the received signal of the RDS broadcast, and is about 500 msec, for example.

  When the process proceeds from S70 to S71, the detection of the PI code from the received signal of the AF station ends, and the detected PI code of the AF station program does not match the PI code of the original station program in S66. This is the case. Therefore, in this case, since the program of the original station and the program of the AF station are different from each other, switching of the output from the speaker 32 to AF is stopped, and in S71, the received signal that has selected the AF station is received. Return the channel selection to the original station. Then, in order to perform diversity processing again, the process returns from S71 to S81.

  FIG. 3 is a block diagram of the phase diversity RDS radio 35. Among the elements of the phase diversity RDS radio 35, the same elements as those of the diversity RDS radio 10 are designated by the same reference numerals as those of the diversity RDS radio 10, and description thereof will be omitted, and only the differences will be described.

  In the phase diversity RDS radio 35, the main tuner unit 12a and the sub-tuner unit 12b perform the first half element unit up to the IF filters 19a and 19b that generate the IF signal band-limited by the IF selector 39, and FM-demodulate the IF signal. Are divided into the latter half element parts from the FM demodulator 20a, 20b. The MP remover 38 is supplied with the outputs of the IF filters 19a and 19b, generates a combined IF signal from which multipath is removed based on the phase difference between the outputs, and outputs the combined IF signal to the IF selector 39. The IF selector 39 controls switching of signal paths between the inputs from the three IF filters 19a and 19b and the MP remover 38 and the two outputs to the FM demodulators 20a and 20b.

  FIG. 4 is a flowchart of an RDS radio control method 80 applied to the phase diversity RDS radio 35 of FIG. The RDS radio control method 80 is implemented in the control unit 29 of the phase diversity RDS radio 35. In the steps of the RDS radio control method 80, the same steps as those of the RDS radio control method 45 (FIG. 2) are denoted by the same reference numerals as those of the corresponding steps of the RDS radio control method 45, and their descriptions are as follows. Omitted and described the differences. In the RDS radio control method 80, S46 to S50 of the RDS radio control method 45 are replaced with S81 to S84, and S55, S67, and S71 of the RDS radio control method 45 are replaced with S87, S88, and S89.

  S81 relates to phase diversity processing. In the phase diversity period, the F / Es 16a and 16b are tuned to the same RDS broadcast frequency. The IF selector 39 connects the inputs from the MP remover 38 and the IF filter 19b to the FM demodulators 20a and 20b, respectively, and the output selector 30 supplies the input from the FM processor 23a to the DAC 31. Therefore, the audio of the program output from the speaker 32 is obtained by removing noise caused by multipath during the phase diversity period. In S81, the FM demodulator 20a, 20b monitors the reception state of the combined IF signal and the IF signal from the IF filter 19b of the sub-tuner unit 12b.

  In S82, it is determined whether or not to perform AF search. If the determination is positive, the process proceeds to S83, and if not, the process returns to S81. As an AF search, for example, (a) During the phase diversity period, the higher the quality of the corresponding received signal as the reception state detected by the reception status detectors 21a and 21b is lower than the predetermined level B1. (B) When the quality of both of the received signals is lower than the predetermined level B2, or (c) when a predetermined time or more has passed since the previous AF search, etc. can be set. Furthermore, the operation rate of an MP (multipath) remover 38, which will be described later, is monitored, and (d) AF search is appropriately performed when the operation rate of the MP remover 38 is low, even if switching to RDS broadcasting is unnecessary. You may do it. In the case of (d), useful AF list information can be accumulated by appropriately performing AF search.

  In S83, the IF selector 39 supplies the inputs from the IF filters 19a and 19b to the FM demodulators 20a and 20b, respectively. Based on the detection of the reception status detectors 21a and 21b, the main tuner unit 12a and the sub-tuner unit 12b detect the better or worse reception state. In S83, the main tuner unit 12a and the sub-tuner unit 12b Among them, the tuner unit having the better reception state is selected from the original station, and the tuner unit having the lower reception state is switched from the original station to the AF station. In addition to the switching in the IF selector 39, the output selector 30 supplies the DAC 31 with the input from the main tuner section 12a and the sub tuner section 12b that selects the original station. In S84, the reception state of the reception signals of the original station and the AF station, that is, the quality of the reception signal is monitored.

  In S87, the tuner unit that selects the original station is also tuned to the AF station, and the IF selector 39 performs FM demodulation on the combined IF signal from the MP remover 38 and the IF signal from the IF filter 19b, respectively. The output selector 30 supplies the input signal from the FM processor 23a to the DAC 31. That is, after returning to phase diversity, the process returns to S46. In FIG. 4, “path1” and “path2” are described for S87 and S88 and S89, which will be described later, but the signal paths connected to the FM demodulators 20a and 20b in the MP remover 38 are respectively shown. "path1" and "path2" are defined.

  In S88, the same processing as S87 is performed. In S89, of the main tuner unit 12a and the sub-tuner unit 12b, the channel that was switched to the AF station in S83 is switched from the AF station to the original station, and the IF selector 39 receives the synthesis from the MP remover 38. The IF signal and the IF signal from the IF filter 19b are supplied to the FM demodulators 20a and 20b, respectively, and the output selector 30 is supplied with the input signal from the FM processor 23a to the DAC 31.

  FIG. 5 is a block diagram of the broadcast receiver 100. Specific examples of the broadcast receiver 100 are a diversity RDS radio 10 and a phase diversity RDS radio 35. Broadcast receiver 100 is not limited to a vehicle-mounted type. The broadcast receiver 100 is not limited to an RDS broadcast receiver. Other than the RDS broadcast, any broadcast may be used as long as an identifier of the program and information on an alternative frequency are transmitted along with the audio of the program. The broadcast receiver 100 may be a receiver for not only radio broadcasting but also television broadcasting. The broadcast receiver 100 includes data extraction means 101, channel selection control means 102, first broadcast quality detection means 103, second broadcast quality detection means 104, and first broadcast update means 105.

  The data extraction means 101 extracts alternative frequency data together with identifier data for a program that is currently being broadcast from the received signal for the broadcast. A broadcast that is currently being output as a program is called a first broadcast, and a broadcast with an alternative frequency acquired from alternative frequency data of the first broadcast is called a second broadcast. The channel selection control means 102 causes the first and second tuner units to select the first broadcast and the second broadcast, respectively, and uses the output of the first tuner unit for program output during the second broadcast search period.

  The first broadcast quality detection means 103 detects the quality of the received signal of the first broadcast. The second broadcast quality detecting means 104 detects the quality of the received signal of the second broadcast. The first broadcast update means 105 extracts the first broadcast received signal quality less than the first level and the second broadcast received signal quality equal to or higher than the first level and within the latest fixed period. When the identifier of the identifier data for the second broadcast is the same as the identifier of the program currently being broadcast in the first broadcast, the first broadcast is updated to make the second broadcast the first broadcast.

  Specific examples of the first and second tuner sections are one and the other of the main tuner section 12a and the sub tuner section 12b. The broadcast receiver is not limited to one equipped with two tuner units. Three or more tuner units may be equipped. The first broadcast and the second broadcast correspond to the original station and the AF station in the RDS radio control method 45 (FIG. 2) and the RDS radio control method 80 (FIG. 4). When the broadcast receiver 100 is equipped with two tuner units, the first tuner unit, for example, of the two tuner units, has the higher received signal quality of the first broadcast immediately before the start of the search period. The tuner section.

  Typically, the channel selection control means 102 performs diversity by the first and second tuner units in a period before the second broadcast search period. Therefore, the first broadcast updating means 105 determines which of the first and second tuner sections has a higher quality of the received signal of the first broadcast by the first broadcast update means 105 in the diversity period. By using the measurement result of the quality of the received signal of the tuner unit, the determination by the first broadcast updating means 105 can be performed smoothly.

  According to the broadcast receiver 100, since the second broadcast is changed to the first broadcast without extracting the identifier data of the currently broadcast program of the second broadcast or without waiting for the extraction, the first quality deteriorated first. The broadcast program can be quickly switched to the second broadcast program. Also, since the identifier data for the second broadcast is not the current one, but is the one within the latest past certain period, it is completely that the current program of the second broadcast matches the program of the first broadcast. However, the success rate of switching to the second broadcast can be set to 100% or a value sufficiently close thereto by appropriately setting a certain past period.

  The first broadcast update unit 105 collects identifier data extracted from the second broadcast at time intervals within a certain past period in a period in which the quality of the received signal of the first broadcast is equal to or higher than the first level. This collection can be performed so that the quality of the received signal of the first broadcast is good and the program of the first broadcast is being output, that is, not noticed by the user. And by collecting such identifiers, the identifier information of the second broadcast used for the identifier coincidence determination in the first broadcast updating means 105 is fully accumulated within the latest fixed period, and the quality of the received signal of the first broadcast is improved. When it becomes less than the first level, it is possible to smoothly switch to the second broadcast.

  Even if the quality of the received signal of the first broadcast is higher than or equal to the first level, the first broadcast updating means 105 has the quality of the received signal of the second broadcast being higher than or equal to the first level, If the identifier of the identifier data extracted from the identifier data is the same as the identifier of the identifier data extracted from the current first broadcast, the first broadcast is updated to make the second broadcast the first broadcast. A specific example is S51 negative → S65 positive → S66 positive → S67 in the RDS radio control method 45 (FIG. 2). In this way, the first broadcast before switching becomes the second broadcast after switching by switching the first broadcast to the second broadcast even though there is no quality deterioration in the received signal of the first broadcast. By sufficiently storing the program identifier information of the second broadcast in the past fixed period, it is possible to facilitate the identifier match determination in the first broadcast update means 105 later.

  If the first broadcast update means 105 determines that the identifier of the current identifier data of the second broadcast does not match the identifier of the identifier data of the first broadcast after the second broadcast is changed to the first broadcast, Return one broadcast to the one before the update. Despite the fact that the identifier of the second broadcast in the most recent past period coincided with the current identifier of the first broadcast, the program of the second broadcast does not coincide with the program of the first broadcast. obtain. In such a case, it is possible to immediately return to the state before switching to the second broadcast and appropriately deal with the failure to switch to the second broadcast.

  Preferably, the data extraction unit 101 extracts genre data for a program currently being broadcast from a reception signal for the broadcast. The 1st broadcast update means 105 adjusts the length of the past fixed period based on the genre of genre data. Genre data in RDS broadcasting can be obtained from PTY (program type). About the length of the program, there is an approximate length according to the genre such as news, music program, live sports and talk program. Therefore, the reliability of the identifier match determination in the first broadcast update unit 105 can be improved by adjusting the length of the past fixed period according to the genre of the currently broadcast program.

  Preferably, the first broadcast update unit 105 detects the time when the identifier of the program of the first broadcast has changed, and sets the start time of the past certain period based on the detected time. The time when the identifier of the program of the first broadcast has changed coincides with the start time of the subsequent program. Therefore, the first broadcast update is performed by adjusting the start time of the past fixed period based on the time when the identifier is changed, and by adjusting the past fixed period to the past broadcast time of each program currently being broadcast in the first broadcast. The reliability of the identifier match determination in the means 105 can be improved.

  The past fixed period can also be set in relation to the vehicle speed of the automobile on which the broadcast receiver 100 is mounted, for example. The past certain period is set shorter as the vehicle speed is higher.

  FIG. 6 is a flowchart of the broadcast receiver control method 120. The broadcast receiver control method 120 is applied to the broadcast receiver 100 and includes S121 to S125. The order of S123 and S124 may be reversed.

  In S121, alternative frequency data is extracted from the received signal for the broadcast together with identifier data for the program that is currently being broadcast. In S122, in the second broadcast search period, the first and second tuner units are selected for the first broadcast and the second broadcast, respectively, and the output of the first tuner unit is used for the program output.

  In S123, the quality of the received signal of the first broadcast is detected. In S124, the quality of the received signal of the second broadcast is detected. In S125, the quality of the received signal of the first broadcast is less than the first level, the quality of the received signal of the second broadcast is greater than or equal to the first level, and the second broadcast extracted within the latest past fixed period If the identifier of the identifier data is the same as the identifier of the program currently being broadcast in the first broadcast, the first broadcast update is performed to change the second broadcast to the first broadcast.

  The processes of S121 to S125 correspond to the functions of the data extraction unit 101 to the first broadcast update unit 105 of the broadcast receiver 100 (FIG. 5), respectively. Therefore, the specific modes described for the functions of the data extraction unit 101 to the first broadcast update unit 105 can also be applied as specific modes for the processes of S121 to S125.

  The program to which the present invention is applied causes a computer to function as each means of the broadcast receiver 100. Another program to which the present invention is applied causes a computer to execute each step of the broadcast receiver control method 120.

  This specification discloses various ranges and levels of the invention. The invention is not limited to the various technical scopes and specific levels of the apparatuses and methods described in the present specification, but within the scope of obviousness of those skilled in the art, the actions and effects independent of the apparatuses and methods. Extracting one or more elements to be played, one or more elements changed within a self-evident range, and combinations of one or more elements between devices and methods Including things.

It is a block diagram of diversity RDS radio. It is a flowchart of the control method applied to the diversity RDS radio of FIG. It is a block diagram of a phase diversity RDS radio. It is a flowchart of the control method applied to the phase diversity RDS radio of FIG. It is a block diagram of a broadcast receiver. It is a flowchart of a broadcast receiver control method.

Explanation of symbols

100: Broadcast receiver 101: Data extraction means 102: Channel selection control means 103: First broadcast quality detection means 104: Second broadcast quality detection means 105: First broadcast update means 120: Broadcast receiver Control method.

Claims (2)

Data extracting means for extracting both the alternative frequency data from the received signal the identifier data for the program is being broadcast the broadcast current for broadcasting,
A broadcast that is currently being output is called a first broadcast, and a broadcast of an alternative frequency acquired from the alternative frequency data of the first broadcast is called a second broadcast. In the second broadcast search period, the first and second broadcasts are called. tuning control means for with each of the tuner to select a first broadcast and the second broadcast using the output of the first tuner section to the program output,
First broadcast quality detection means for detecting the quality of the received signal of the first broadcast;
Second broadcast quality detection means for detecting the quality of the received signal of the second broadcast; and
The identifier data for the second broadcast that is extracted within the latest fixed period and the quality of the received signal of the first broadcast is less than the first level and the quality of the received signal of the second broadcast is higher than the first level. If the identifier of the first broadcast is the same as the identifier of the program currently being broadcast in the first broadcast, the first broadcast update means for performing the first broadcast update to make the second broadcast the first broadcast,
The first broadcast update means, after the second broadcast in the first broadcast, if the current identifier data of the identifier of the second broadcast is found to be an identifier inconsistent identifier data of the first broadcast, A broadcast receiver, wherein the first broadcast is returned to the one before update . Data extracting means for extracting both the alternative frequency data from the received signal the identifier data for the program is being broadcast the broadcast current for broadcasting,
A broadcast that is currently being output is called a first broadcast, and a broadcast of an alternative frequency acquired from the alternative frequency data of the first broadcast is called a second broadcast. In the second broadcast search period, the first and second broadcasts are called. tuning control means for with each of the tuner to select a first broadcast and the second broadcast using the output of the first tuner section to the program output,
First broadcast quality detection means for detecting the quality of the received signal of the first broadcast;
Second broadcast quality detection means for detecting the quality of the received signal of the second broadcast; and
The identifier data for the second broadcast that is extracted within the latest fixed period and the quality of the received signal of the first broadcast is less than the first level and the quality of the received signal of the second broadcast is higher than the first level. If the identifier of the first broadcast is the same as the identifier of the program currently being broadcast in the first broadcast, the first broadcast update means for performing the first broadcast update to make the second broadcast the first broadcast,
It said data extracting means extracts Ja Nrudeta for the program currently being broadcast from the received signal for broadcasting,
The first broadcast update means, broadcast receiver, which comprises-out based the length genre genre data adjustment of the past predetermined period.

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