JP2011250332A - Receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiving device which is mounted on a mobile object and which ensures that a broadcast program can be watched when channel select buttons are operated.SOLUTION: A receiving device includes: first and second tuners; reproducing means for reproducing a broadcast received by the first tuner as audio or video; a controller for independently setting up respective broadcast frequencies received by the first and the second tuners; and a plurality of channel selection buttons. The controller controls the first tuner to receive a broadcast having a frequency allocated to a channel selection button when any one of the channel selection buttons is pushed. The controller scans for a receivable frequency when finding that there is a channel selection button to which an unreceivable frequency is allocated as a result of controlling the second tuner, and allocates a receivable frequency to the channel selection botton to which the unreceivable frequency is allocated.

Description

  The present invention relates to a receiving device mounted on a moving body such as an automobile.

  A receiving device that is mounted on a moving body such as an automobile, receives a broadcast signal (radio signal, television signal) using a radio wave as a carrier path, and reproduces audio and video included in the broadcast signal is widely used. Yes. Such a receiving apparatus is generally provided with about 5 to 10 channel selection buttons to which a frequency of a specific station is assigned so that a broadcast of a specific station can be quickly received and reproduced.

  In general, the frequency of a broadcast signal to be provided varies depending on the region. For this reason, in a receiving device mounted on a mobile body such as an automobile, the frequency of a station that can be received in an area where the mobile body is normally located (hereinafter referred to as a normal area) is registered in the channel selection button. It is preferable that the first mode and the second mode in which a frequency of a station different from the first mode is registered in the channel selection button can be switched. That is, normally, the setting of the receiving apparatus is the first mode, and when the mobile object moves away from the normal area, the frequency of the station that can be received in that area by switching to the second mode. Is assigned to the channel selection button. After the mobile unit returns to the normal area, the frequency assigned to the channel selection button becomes that of the station that can receive in the normal area by switching the setting of the receiving device to the first mode again.

  When the receiving apparatus operates in the second mode, for example, like the receiving apparatus disclosed in Patent Document 1, the receiving apparatus configured as described above performs frequency scanning and displays a list of frequencies of receivable stations. Based on the obtained frequency list, the frequency is temporarily assigned to the channel selection button (auto store function).

JP 2006-222984 A

  However, even if a frequency is assigned to the channel selection button once using the auto store function, there is a case where it is impossible to receive a broadcast of a station having the assigned frequency due to movement of the mobile body. When such a phenomenon occurs, there may be a problem that the broadcast program cannot be viewed even if the channel selection button is operated.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a receiving apparatus that can reliably watch a broadcast program when a channel selection button is operated.

  In order to achieve the above object, a receiving apparatus of the present invention includes first and second tuners for receiving broadcasts, and reproduction means for reproducing broadcasts received by the first tuner as audio or video, A controller that controls the first and second tuners to independently set the broadcast frequencies received by the first and second tuners; and a plurality of channel selection buttons. Controlling the first tuner so that a broadcast of the frequency assigned to the pressed channel selection button is received when one of the channel selection buttons is pressed, and controlling the second tuner, Detects whether the frequency assigned to multiple channel selection buttons can be received, and selects the channel that cannot be received. When it is confirmed that there is a receivable frequency using the second tuner, and when a receivable frequency is found, a frequency that cannot be received is detected as a frequency that can be received. It is characterized by assigning to an assigned channel selection button.

  As described above, according to the present invention, there is a channel selection button that automatically detects the presence or absence of a channel selection button that is assigned a frequency at which a broadcast cannot be received due to movement of a mobile object and cannot receive a broadcast. When a frequency is scanned to detect a receivable broadcast frequency, the detected frequency is assigned to a channel selection button that cannot receive the broadcast. For this reason, when the channel selection button is operated, the broadcast program can be reliably viewed.

  In addition, when the controller scans whether there is a receivable frequency using the second tuner and finds a receivable frequency, the detected frequency is set to one of the plurality of channel selection buttons. If it is confirmed that the found frequency is assigned to one of the plurality of channel selection buttons, a scan is performed for other receivable frequencies. Preferably, the second tuner is controlled to be performed.

  With such a configuration, the same frequency is not assigned to a plurality of channel selection buttons.

  The controller also controls the second tuner to detect whether the frequency assigned to the channel selection button is receivable, to scan for a receivable frequency, and to detect the detected frequency. It is preferable that the process of allocating continuously to the channel selection button to which the frequency that cannot be received is allocated is repeatedly executed.

  With such a configuration, when a broadcast cannot be received at the frequency assigned to the channel selection button due to the movement of the mobile body, a new receivable frequency is immediately assigned to the channel selection button.

  In addition, when the controller cannot receive the broadcast received by the first tuner, it stores the frequency of the broadcast received by the first tuner in a predetermined storage area, and assigns a frequency that cannot be received. When it is confirmed that the selected channel selection button is present, the second tuner is controlled to check whether the broadcast can be received at the frequency stored in the predetermined storage area, and the frequency stored in the predetermined storage area. When it is confirmed that the broadcast can be received, it is preferable that the frequency stored in the predetermined storage area is assigned to the channel selection button to which the frequency that cannot be received is assigned.

  With such a configuration, the frequency once received by the first tuner but not received by the movement of the mobile object is preferentially again when the broadcast reception at that frequency becomes possible. It will be assigned to the channel selection button.

  As described above, according to the present invention, it is possible to realize a receiving apparatus that can surely view a broadcast program when a channel selection button is operated.

FIG. 1 is a block diagram of a receiving apparatus according to an embodiment of the present invention. FIG. 2 is a front view of the front panel of the receiving apparatus according to the embodiment of the present invention. FIG. 3 is a flowchart of a program executed by the controller when shifting from the normal mode to the auto store mode in the receiving apparatus according to the embodiment of the present invention. FIG. 4 is a flowchart of a channel change subroutine according to the embodiment of the present invention. FIG. 5 is a flowchart of the frequency seek program according to the embodiment of the present invention. FIG. 6 is a flowchart of an AM seek subroutine according to the embodiment of this invention. FIG. 7 is a flowchart of the FM seek subroutine according to the embodiment of this invention.

  Embodiments of the present invention will be described below. FIG. 1 is a block diagram of a receiving apparatus according to this embodiment. The receiving apparatus according to the present embodiment is a so-called car radio that is mounted on a car, receives FM or AM radio broadcast signals, and reproduces them with a speaker. The receiving apparatus 1 according to the present embodiment includes a main receiving unit 10, a sub receiving unit 20, a display unit 30, an input unit 40, an audio circuit 51, a speaker 52, and a controller 60.

  The main receiver 10 includes an antenna 11 and a first tuner 12, receives a broadcast signal having a frequency set by the first tuner 12 via the antenna 11, extracts an audio signal from the received broadcast signal, This is output to the audio circuit 51.

  The audio signal output from the main receiving unit 10 is sent to the audio circuit 51. The audio circuit 51 amplifies the audio signal from the main receiver 10 and outputs it to the speaker 52. As a result, the sound of the broadcast program received by the main receiver 10 is emitted from the speaker 52.

  The sub-receiving unit 20 includes an antenna 21 and a second tuner 22, and receives a broadcast signal having a frequency set in the second tuner 22 by a frequency seek program described later via the antenna 21.

  The controller 60 controls the first tuner 12 and the second tuner 22 of the main receiver 10 and the sub receiver 20, and can separately set the frequency of the broadcast signal received by the main receiver 10 and the sub receiver 20. ing. The first tuner 12 and the second tuner 22 have a detection circuit (not shown) for detecting whether a broadcast signal is received at a set frequency, and the controller 60 is based on the detection circuit. By detecting the detection result, it is possible to determine the reception status of the first tuner 12 and the second tuner 22 (whether a broadcast signal is received at the set frequency).

  The input unit 40 is a control panel having a plurality of buttons and a dial. Although details will be described later, the user of the receiving apparatus 1 can change the frequency of the broadcast signal received by the first tuner 12 by operating the input unit 40. The display unit 30 displays the type of broadcast (FM / AM, etc.) and frequency currently received by the first tuner 12.

  Details of the display unit 30 and the input unit 40 will be described. The display unit 30 and the input unit 40 are mounted on the front panel 70 of the receiving device 1. FIG. 2 is a front view of the front panel 70 of the receiving device 1.

The display unit 30 is a panel that can display an image such as an LCD monitor. The input unit 40 includes, FM button 41, AM button 42, A-S (autoselect) button 43, the first knob 44, the second knob 45, and a six-channel selection buttons ₄₆ 1 to 46 _6.

  The FM button 41 and the AM button 42 are buttons for switching the broadcast currently received by the main receiver 10 (FIG. 1) to the FM broadcast and the AM broadcast, respectively. That is, when the FM button 41 is pressed, the broadcast currently received by the main receiver 10 is switched to the FM broadcast. In addition, when the AM button 42 is pressed, the broadcast currently received by the main receiving unit 10 is switched to the AM broadcast.

  The A-S button 43 is a button for switching between an auto store mode and a normal mode, which will be described later.

  The first knob 44 is a frequency adjusting knob. That is, when the first knob 44 is rotated clockwise, the frequency of the radio wave received by the first tuner 12 of the main receiving unit 10 increases, and when the first knob 44 is rotated counterclockwise, the first receiving unit 10 of the main receiving unit 10 is rotated. The frequency of radio waves received by one tuner 12 decreases.

  The second knob 45 is a knob for adjusting the volume of the sound output from the speaker 52. That is, when the second knob 45 is rotated clockwise, the sound output from the speaker 52 increases, and when the second knob 45 is rotated counterclockwise, the sound output from the speaker 52 decreases.

The channel selection buttons 46 _{1 to} 46 ₆ are set with frequencies corresponding to the channel selection buttons 46 _{1 to} 46 ₆ , respectively, and the frequency of the radio wave received by the first tuner 12 of the main reception unit 10 when the channel selection buttons 46 _{1 to} 46 ₆ are pressed. Is the frequency set for each button. In the present embodiment, the FM broadcast is configured so that two frequencies can be registered in each of the channel selection buttons 46 _{1 to} 46 ₆ . In other words, in the present embodiment, six types of frequencies (first system) with high use frequency and six types of frequencies (second system) with relatively low use frequency are switched to channel selection buttons 46 _{1 to} 46 ₆ . Assigned. Whether the frequency of the first system or the second system is received is switched each time the FM button 41 is pressed. That is, by pressing the FM button 41 in a state where the husband of the channel selection buttons ₄₆ 1 to 46 ₆ s frequency of the first system are set, frequency set to each of the channel selection buttons ₄₆ 1 to 46 ₆ s is the switches to one of the two systems, by pressing the FM button 41 in a state in which the respective channel selection buttons ₄₆ 1 to 46 ₆ is the frequency of the second system is set, set each channel selection buttons ₄₆ 1 to 46 ₆ s Frequency to be switched to that of the first system.

Note that the frequency data received when the channel selection buttons 46 _{1 to} 46 ₆ are pressed are associated with the channel selection buttons 46 _{1 to} 46 ₆ and are stored in the flash memory 61 built in the controller 60 (FIG. 1). ) And is read from the flash memory 61 and stored in the built-in memory of the controller 60 when the receiving device 1 is activated.

The display unit 30 receives FM broadcast or AM broadcast, and for FM broadcast, which frequency of the first system or the second system is set to the channel selection button, information indicating whether the received and are broadcast frequency, and any frequency channel selection buttons 46 ₁ to 46 ₆ is selected and is displayed.

The receiving apparatus 1 of the present embodiment uses the frequency of the broadcast that is received when the channel selection buttons 46 _{1 to} 46 ₆ are pressed as the frequency in the normal mode registered by the user (stored in the flash memory 61) or can be received. a frequency scanning (seeking), it is possible to select whether to temporarily channel selection button 46 _{1-46 6} assigned the auto store mode frequency frequency determined to be received. This mode is selected by pressing the A-S button 43. In the auto store mode, as shown in FIG. 2, characters “AS” indicating the auto store mode are displayed on the display unit 30.

  The operation of the receiving device 1 in the auto store mode will be described below. FIG. 3 is a flowchart of a program executed by the controller 60 when shifting from the normal mode to the auto store mode. As will be described later, in this embodiment, the controller 60 always seeks a frequency that can be received by the sub-receiving unit 20 in the background regardless of whether or not it is in the auto store mode. For each of broadcasting, FM broadcasting (first system), and FM broadcasting (second system), a maximum of six receivable frequencies are continuously acquired. Receivable AM broadcast, FM broadcast (first system), and FM broadcast (second system) frequencies are stored in arrays FreqAM [n], FreqFM1 [n], and FreqFM2 [n], respectively. . In addition, n is an integer of 1-6.

  When the program of FIG. 3 is started, step S1 is executed. In step S1, it is detected which of the AM broadcast and FM broadcast the main reception unit 10 has received when the AS button 43 is pressed. If the received broadcast is an AM broadcast (S1: AM), the process proceeds to step S2.

In step S2, the controller 60 controls the first tuner 12 of the main receiving unit 10, setting the frequency of the first tuner 12 receives FreqAM [1] (i.e., the frequency set in the channel selection button 46 ₁₎ To do. Furthermore, the controller 60, information indicating that it is receiving the broadcast frequency of the channel selection buttons 46 ₁ to be displayed on the display unit 30. That is, the same state as when the channel selection button 46 ₁ is pressed. Next, the process proceeds to step S4.

  If the received broadcast is FM broadcast in step S1 (S1: FM), the process proceeds to step S3.

In step S3, the controller 60 controls the first tuner 12 of the main receiving unit 10, a frequency first tuner 12 receives FreqFM1 [1] (i.e., the channel selection button 46 ₁ during FM broadcast reception of the first system Set frequency). Furthermore, the controller 60, the setting of the channel selection buttons ₄₆ 1 to 46 ₆ is an FM broadcast (first system), and the information indicating that it is receiving the broadcast frequency of the channel selection buttons 46 _1, display Display on the unit 30. That is, the same state as when the FM broadcast of the first system is configured and the channel selection button 46 ₁ is pressed. Next, the process proceeds to step S4.

  In step S4, an event such as a button input or a decrease in the reception state (sensitivity) of the broadcast currently received by the main receiver 10 is received. If it is detected that some event has occurred, the process proceeds to step S5.

  Step S5 is a branching step that branches the process according to the type of event detected in step S4. If the detected event is to switch the received broadcast to the AM broadcast (that is, the AM button 42 is pressed when receiving the FM broadcast) (S5: switch to AM), the process proceeds to step S6.

  In step S6, the controller 60 controls the first tuner 12 of the main receiver 10 and switches the broadcast received by the first tuner 12 to the AM broadcast. Next, the process returns to step S2.

  In step S5, if an event is detected in which the FM button 41 is pressed (S5: FM button), the process proceeds to step S7.

In step S7, whether the broadcast received by the first tuner 12 is an AM broadcast or an FM broadcast, and when the FM broadcast is received, the channel selection buttons 46 _{1 to} 46 ₆ are set to the first. Whether it is a system or a second system is detected. If the current broadcast is an AM broadcast (S7: AM), the process proceeds to step S8.

In step S8, the controller 60 controls the first tuner 12 of the main receiving unit 10 and switches the broadcast received by the first tuner 12 to the FM broadcast. Next, the process proceeds to step S3. Then, by executing step S3, the frequency of the FM broadcast received by the first tuner 12 is set to FreqFM1 [1]. As described above, in this embodiment, when the FM button 41 is pressed when receiving an AM broadcast, reception is broadcast, broadcast frequency set to the channel selection button 46 _first FM broadcast (first line) Can be switched to.

  In step S7, if the broadcast received by the first tuner 12 is FM broadcast and the channel selection button is set to FM broadcast (first system) (S7: FM (1)), step Proceed to S9.

In step S9, the controller 60 controls the first tuner 12 of the main receiving unit 10, a frequency first tuner 12 receives FreqFM2 [1] (i.e., the channel selection button 46 ₁ during FM broadcast reception of the second system Set frequency). Furthermore, the controller 60, the setting of the channel selection buttons ₄₆ 1 to 46 ₆ is an FM broadcast (second system), and the information indicating that it is receiving the broadcast frequency of the channel selection buttons 46 _1, display Display on the unit 30. That is, the same state as when the FM broadcast of the second system is set and the channel selection button 46 ₁ is pressed. Next, the process proceeds to step S4.

Further, in step S7, the broadcast being received by the first tuner 12 is an FM broadcast, and if the channel selection button ₄₆ 1-46 ₆ settings is FM broadcast (second system) is (S7: FM ( 2)), go to step S3. Then, by executing step S3, the frequency of the FM broadcast received by the first tuner 12 is set to FreqFM1 [1]. Thus, in the present embodiment, the received and has and channel selection buttons 46 ₁ to 46 ₆ Configuring the FM broadcast FM button 41 is pressed when an FM broadcast (second system), receives broadcast but it is switched to the broadcast of the frequency set in the channel selection button 46 _first FM broadcast (first line).

Further, in step S5, if the event any of the channel selection buttons ₄₆ 1 to 46 ₆ is depressed is detected - go to (S5 channel selection buttons), step S10.

In step S10, a channel change subroutine is executed to change the frequency received by the first tuner 12 of the main receiver 10 in accordance with the pressed channel selection buttons 46 _{1 to} 46 ₆ (described later). Next, the process proceeds to step S4.

Further, in step S5, when the event A-S button 43 is depressed is detected (S5: A-S button), followed by terminating the program (channel selection button ₄₆ 1-46 ₆ setting of the normal mode Back to).

  If a decrease in the reception sensitivity of the broadcast received by the first tuner 12 of the main receiver 10 is detected in step S5, the process proceeds to step S11.

  In step S11, the frequency of the broadcast received by the first tuner 12 of the main receiver 10 is stored in a variable TempFreqAM (when receiving an AM broadcast) or a variable TempFreqFM (when receiving an FM broadcast). Next, the process proceeds to step S12.

In step S12, the controller 60 causes the display unit 30 to display a message for notifying the user that the reception state is currently poor. The user who has confirmed this message can change the frequency of the received broadcast to another effective (receivable) broadcast frequency by operating the channel selection buttons 46 _{1 to} 46 _{6 and the} like. Next, the process returns to step S4.

  Next, the channel change subroutine of step S10 in FIG. 3 will be described. FIG. 4 is a flowchart of the channel change subroutine. When this subroutine is executed, step S101 is executed.

In step S101, whether the broadcast received by the first tuner 12 is an AM broadcast or an FM broadcast, and the channel selection buttons 46 _{1 to} 46 ₆ are set to the first when the FM broadcast is received. Whether it is a system or a second system is detected. If it is detected that the received broadcast is an AM broadcast (S101: AM), the process proceeds to step S102.

In step S102, the controller 60 controls the first tuner 12 of the main receiving unit 10, a frequency corresponding to the frequency of the first tuner 12 receives, the channel selection button 46 _n detected in In step S4 (Fig. 3) That is, it is changed to FreqAM [n]. Next, the process proceeds to step S103.

In step S103, the frequency and currently received, a message indicating that it is receiving a broadcast corresponding to the channel selection button 46 _n is displayed on the display unit 30. Then, this subroutine is finished.

Further, in step S101, a broadcast FM broadcasting is being received, and if the channel selection button ₄₆ 1-46 ₆ settings is detected that has a FM broadcast (first system) (S101: FM (1)), the process proceeds to step S104.

In step S104, the controller 60 controls the first tuner 12 of the main receiving unit 10, a frequency corresponding to the frequency of the first tuner 12 receives, the channel selection button 46 _n detected in In step S4 (Fig. 3) That is, it is changed to FreqFM1 [n]. Next, the process proceeds to step S105.

In step S105, the frequency and currently received, a message indicating that it is receiving a broadcast corresponding to the channel selection button 46 _n is displayed on the display unit 30. Then, this subroutine is finished.

Further, in step S101, a broadcast FM broadcasting is being received, and if the channel selection button ₄₆ 1-46 ₆ settings is detected that has a FM broadcast (second system) (S101: FM (2)), the process proceeds to step S106.

In step S106, the controller 60 controls the first tuner 12 of the main receiving unit 10, a frequency corresponding to the frequency of the first tuner 12 receives, the channel selection button 46 _n detected in In step S4 (Fig. 3) That is, it is changed to FreqFM2 [n]. Next, the process proceeds to step S107.

In step S107, the frequency and currently received, a message indicating that it is receiving a broadcast corresponding to the channel selection button 46 _n is displayed on the display unit 30. Then, this subroutine is finished.

  As described above, the controller 60 always seeks the frequency in the sub-reception unit 20 in the background regardless of whether or not the auto store mode is set. The frequency seek process will be described below.

  FIG. 5 is a flowchart of the frequency seek program. This program is started when the receiving apparatus 1 is started. When this program is started, step S210 is first executed.

  Step S210 is an AM seek subroutine for causing the second tuner 22 of the sub-receiving unit 20 to seek AM broadcasts. When this subroutine is completed, step S230 is executed next.

  Step S230 is an FM seek subroutine for causing the second tuner 22 of the sub-receiving unit 20 to seek FM broadcasts. When this subroutine is completed, step S251 is executed next.

  In step S251, it is detected whether or not the shutdown operation of the receiving device 1 has been performed. If the shutdown operation has been performed (S251: YES), this program is terminated. On the other hand, if the shutdown operation has not been performed (S251: NO), the process returns to step S210.

  Next, the AM seek subroutine (step S210 in FIG. 5) executed in the frequency seek program will be described. FIG. 6 is a flowchart of the AM seek subroutine. When this subroutine is executed, step S211 is executed.

  In step S <b> 211, the controller 60 controls the second tuner 22 of the sub-receiving unit 20 so that the AM broadcast is received by the second tuner 22. Next, the process proceeds to step S212.

  In step S212, a test is performed to determine whether or not the broadcast of the frequency stored in FreqAM [1] to FreqAM [6] can be received. That is, the controller 60 sequentially sets the broadcast frequency received by the second tuner 22 to FreqAM [1], FreqAM [2], FreqAM [3], FreqAM [4], FreqAM [5], and FreqAM [6]. Detecting whether broadcast can be received at each frequency. Next, the process proceeds to step S213.

  In step S213, a branch process based on the detection result in step S212 is performed. That is, it is determined whether or not there is a frequency that cannot be received among the frequencies stored in FreqAM [1] to FreqAM [6]. If no unreceivable frequency is found (S213: NO), this subroutine is terminated, and the FM scanning subroutine of step S230 (FIG. 5) is executed. On the other hand, if a frequency that cannot be received is found (S213: YES), the process proceeds to step S214.

  In step S214, the controller 60 controls the second tuner 22 of the sub-receiving unit 20 to check whether the broadcast can be received at the frequency stored in the variable TempFreqAM in step S11 (FIG. 3). If the broadcast can be received at the frequency stored in the variable TempFreqAM (S214: YES), the process proceeds to step S215.

In step S215, the frequency stored in the variable TempFreqAM is stored in FreqAM [n] in which the frequency that could not be received in step S212 is stored. Next, the contents of the variable TempFreqAM are cleared. As a result, when the channel selection button 46 _n (FIG. 2) is pressed, the broadcast of the frequency stored in FreqAM [n] (that is, the frequency stored in the variable TempFreqAM) can be received (FIG. 4: Step S102). ). In this case, the broadcast received when the channel selection button 46 _n is pressed is a broadcast that was previously received on the main receiving unit 10 side, but is temporarily unreceivable as the automobile moves. That is, it broadcasts once became unreceivable the main receiving unit 10 side to be preferentially allocated to the channel selection button 46 _n. Next, the process proceeds to step S220.

  If it is confirmed in step S214 that the broadcast cannot be received at the frequency stored in the variable TempFreqAM (S214: NO), the process proceeds to step S216.

  In step S216, frequency seek processing for detecting receivable broadcast frequencies is performed. In this step, the reception frequency of the second tuner 22 is first set to the minimum receivable frequency, and the frequency is gradually increased until a receivable broadcast is found. If a receivable broadcast is detected or the reception frequency of the second tuner 22 reaches the maximum receivable frequency, the frequency seek process is interrupted, and then step S217 is executed.

  In step S217, depending on whether the interruption of the frequency seek process in step S216 is due to the detection of a receivable broadcast or the reception frequency of the second tuner 22 has reached the maximum receivable frequency. Branch processing to branch the processing. If the interruption of the frequency seek processing in step S216 is due to the fact that the reception frequency of the second tuner 22 has reached the maximum receivable frequency (S217: NO), this routine is terminated, and then step S230 (FIG. The FM seek subroutine of 5) is executed. On the other hand, if the interruption of the frequency seek process in step S216 is due to the detection of a receivable broadcast (S217: YES), the process proceeds to step S218.

  In step S218, the frequency of the broadcast detected in step S216 is compared with the frequencies stored in FreqAM [1] to FreqAM [6]. If the same value as the frequency of the broadcast detected in step S216 is stored in any of FreqAM [1] to FreqAM [6] (step S218: YES), the process returns to step S216 and the frequency seek process is resumed. . The frequency seek process in this case is resumed from the frequency at which the previous seek was interrupted. On the other hand, if the same value as the frequency of the broadcast detected in step S216 is not stored in any of FreqAM [1] to FreqAM [6] (S218: NO), the process proceeds to step S219.

In step S219, the frequency detected in step S216 is stored in FreqAM [n] in which the frequency that could not be received in step S212 is stored. As a result, when the channel selection button 46 _n (FIG. 2) is pressed, the broadcast of the frequency stored in FreqAM [n] can be received (FIG. 4: step S102). Next, the process proceeds to step S220.

In step S220, still there are any remaining FreqAM [n] whose frequency is stored can not be received in the other (i.e., still or channel selection button 46 _n can not receive a broadcasting button is left) if the Judgment is made. If broadcasts can be received at all frequencies of FreqAM [1] to FreqAM [6] (S220: NO), this routine is terminated, and then the FM seek subroutine of step S230 (FIG. 5) is executed. On the other hand, if it is determined that FreqAM [n] in which other frequencies that cannot be received yet remain (S220: YES), the process returns to step S216, and the frequency seek process is resumed. The frequency seek process in this case is resumed from the frequency at which the previous seek was interrupted. If step S220 is executed subsequent to step S215, the frequency seek process has not yet been performed, so the frequency seek process in step S216 is performed from the lowest frequency that can be received by the second tuner 22. .

As described above, when this subroutine is executed, if there is a channel selection button 46 _{1 to} 46 ₆ that cannot receive the broadcast even if the button is pressed, it is determined whether there is any other frequency at which the broadcast can be received. detected by the frequency seek process, when the receivable and frequency that is not registered in the other button is detected is adapted to allocate the detected frequency to the channel selection button 46 _{1-46 6} can not receive the broadcast . As a result, when there are 6 or more receivable broadcasts, the receivable broadcast frequencies are always assigned to all of the channel selection buttons 46 _{1 to} 46 ₆ .

  Next, the FM seek subroutine (step S230 in FIG. 5) executed in the frequency seek program will be described. FIG. 7 is a flowchart of the FM seek subroutine. When this subroutine is executed, step S231 is executed.

  In step S <b> 231, the controller 60 controls the second tuner 22 of the sub-receiving unit 20 so that the FM broadcast is received by the second tuner 22. Next, the process proceeds to step S232.

  In step S232, a test is performed to determine whether or not the broadcasts at the frequencies stored in FreqFM1 [1] to FreqFM1 [6] and FreqFM2 [1] to FreqFM2 [6] are receivable. That is, the controller 60 sets the frequency of the broadcast received by the second tuner 22 to FreqFM1 [1], FreqFM1 [2], FreqFM1 [3], FreqFM1 [4], FreqFM1 [5], FreqFM1 [6], FreqFM2 [1. ], FreqFM2 [2], FreqFM2 [3], FreqFM2 [4], FreqFM2 [5], FreqFM2 [6], and detects whether or not the broadcast can be received at each frequency. Next, the process proceeds to step S233.

  In step S233, branch processing based on the detection result in step S232 is performed. That is, it is determined whether or not there is a frequency that cannot be received among the frequencies stored in FreqFM1 [1] to FreqFM1 [6] and FreqFM2 [1] to FreqFM2 [6]. If no unreceivable frequency is found (S233: NO), this subroutine is terminated, and the process proceeds to step S251 (FIG. 5). On the other hand, if a frequency that cannot be received is found (S233: YES), the process proceeds to step S234.

  In step S234, the controller 60 controls the second tuner 22 of the sub-receiving unit 20 to confirm whether or not the broadcast can be received at the frequency stored in the variable TempFreqFM in step S11 (FIG. 3). If the broadcast can be received at the frequency stored in the variable TempFreqFM (S234: YES), the process proceeds to step S235.

In step S235, the frequency stored in the variable TempFreqFM is stored in FreqFM1 [n] or FreqFM2 [n] in which the frequency that could not be received in step S232 is stored. Next, the contents of the variable TempFreqFM are cleared. As a result, if the frequency storage destination in this step is FreqFM1 [n], the frequency stored in FreqFM1 [n] when the channel selection button 46 _n (FIG. 2) is pressed when receiving the first FM broadcast. Broadcast (that is, the frequency stored in the variable TempFreqFM) can be received (FIG. 4: Step S104). On the other hand, if the frequency storage destination in this step is FreqFM2 [n], when the channel selection button 46 _n (FIG. 2) is pressed when receiving the FM broadcast of the second system, the frequency stored in FreqFM2 [n] Broadcast can be received (FIG. 4: step S106). The broadcast received when the channel selection button 46 _n is pressed is a broadcast that was previously received by the main receiving unit 10 side, but has once become unreceivable as the automobile moves. That is, it broadcasts once became unreceivable the main receiving unit 10 side to be preferentially allocated to the channel selection button 46 _n. Next, the process proceeds to step S240.

  If it is confirmed in step S234 that the broadcast cannot be received at the frequency stored in the variable TempFreqFM (S234: NO), the process proceeds to step S236.

  In step S236, frequency seek processing for detecting receivable broadcast frequencies is performed. In this step, the reception frequency of the second tuner 22 is first set to the minimum receivable frequency, and the frequency is gradually increased until a receivable broadcast is found. When a receivable broadcast is detected or the reception frequency of the second tuner 22 reaches the maximum receivable frequency, the frequency seek process is interrupted, and then step S237 is executed.

  In step S237, whether the interruption of the frequency seek process in step S236 is due to the detection of a receivable broadcast or the reception frequency of the second tuner 22 has reached the maximum receivable frequency. Branch processing to branch the processing. If the interruption of the frequency seek process in step S236 is due to the fact that the reception frequency of the second tuner 22 has reached the maximum receivable frequency (S237: NO), this routine is terminated, and then step S251 (FIG. Go to 5). On the other hand, if the interruption of the frequency seek process in step S236 is due to the detection of a receivable broadcast (S237: YES), the process proceeds to step S238.

  In step S238, the frequency of the broadcast detected in step S236 is compared with the frequencies stored in FreqFM1 [1] to FreqFM1 [6] and FreqFM2 [1] to FreqFM2 [6]. When the same value as the frequency of the broadcast detected in step S236 is stored in any of FreqFM1 [1] to FreqFM1 [6] and FreqFM2 [1] to FreqFM2 [6] (step S238: YES), step Returning to S236, the frequency seek process is resumed. The frequency seek process in this case is resumed from the frequency at which the previous frequency seek process was interrupted. On the other hand, when the same value as the frequency of the broadcast detected in step S236 is not stored in any of FreqFM1 [1] to FreqFM1 [6] and FreqFM2 [1] to FreqFM2 [6] (S238: NO), Proceed to step S239.

In step S239, the frequency detected in step S236 is stored in FreqFM1 [n] or FreqFM2 [n] in which the frequency that could not be received in step S232 is stored. As a result, if the frequency storage destination in this step is FreqFM1 [n], the broadcast of frequency FreqFM1 [n] is received when the channel selection button 46 _n (FIG. 2) is pressed during FM broadcast reception of the first system. (FIG. 4: Step S104). On the other hand, if the frequency storage destination in this step is FreqFM2 [n], the broadcast of frequency FreqFM2 [n] can be received when the channel selection button 46 _n (FIG. 2) is pressed when receiving the FM broadcast of the second system. (FIG. 4: Step S106). Next, the process proceeds to step S240.

In step S240, still there are any remaining FreqFM1 stored frequencies can not be received in the other [n] or FreqFM2 [n] (i.e., left the channel selection button 46 _n which still can not receive the broadcast by pressing the button Is determined). If broadcasts can be received at all frequencies of FreqFM1 [1] to FreqFM1 [6] and FreqFM2 [1] to FreqFM2 [6] (S240: NO), this routine ends, and then step S251 (FIG. 5). ) On the other hand, if it is determined that FreqFM1 [n] or FreqFM2 [n] in which frequencies that cannot be received yet remain (S240: YES), the process returns to step S236 to restart the frequency seek process. The frequency seek process in this case is resumed from the frequency at which the previous frequency seek process was interrupted. If step S240 is executed subsequent to step S235, the frequency seek process has not yet been performed, so the frequency seek process in step S236 is performed from the lowest frequency that can be received by the second tuner 22. .

As described above, when this subroutine is executed, if there is a channel selection button 46 _{1 to} 46 ₆ that cannot receive the broadcast even if the button is pressed, it is determined whether there is any other frequency at which the broadcast can be received. detected by the frequency seek process, when the receivable and frequency that is not registered to another channel selection button is detected, so assign frequencies detected in the channel selection button 46 _{1-46 6} can not receive the broadcast ing. As a result, when there are 12 or more receivable broadcasts, the receivable broadcast frequencies are always assigned to all of the channel selection buttons 46 _{1 to} 46 ₆ .

  In addition, although the receiving apparatus 1 of this embodiment was demonstrated as a structure which receives a broadcast signal and reproduces | regenerates an audio | voice, it is not restricted to this structure. For example, a configuration in which a broadcast signal is received and video is reproduced, and a configuration in which a broadcast signal is received and audio and video are reproduced may be employed.

DESCRIPTION OF SYMBOLS 1 Receiver 10 Main receiver 12 First tuner 20 Sub-receiver 22 Second tuner 30 Display unit 40 Input unit 60 Controller

Claims (4)

First and second tuners for receiving broadcasts;
Playback means for playing back the broadcast received by the first tuner as audio or video;
A controller that controls the first and second tuners to independently set the frequency of the broadcast received by the first and second tuners;
Multiple channel select buttons,
Have
The controller is
Controlling the first tuner so that a broadcast of a frequency assigned to the pressed channel selection button is received when any of the plurality of channel selection buttons is pressed;
The second tuner is controlled to detect whether the frequency assigned to the plurality of channel selection buttons is receivable, and it is confirmed that there is a channel selection button assigned a frequency that cannot be received. When the second tuner is used to scan whether there is a receivable frequency, and when a receivable frequency is found, the channel to which the frequency that cannot be received is assigned to the found frequency. A receiving device assigned to a selection button.   The controller scans whether there is a receivable frequency using the second tuner, and when a receivable frequency is found, the detected frequency is set to one of the plurality of channel selection buttons. If it is confirmed that the found frequency is assigned to one of the plurality of channel selection buttons, a scan is performed for other receivable frequencies. The receiving apparatus according to claim 1, wherein the second tuner is controlled to be performed.   The controller controls the second tuner to detect whether a frequency assigned to the channel selection button is receivable, scan for a receivable frequency, and detect a detected frequency. The receiving apparatus according to claim 1 or 2, wherein the process of assigning to a channel selection button to which a frequency that cannot be received is assigned is repeatedly executed. The controller is
When the broadcast received by the first tuner cannot be received, the frequency of the broadcast received by the first tuner is stored in a predetermined storage area,
When it is confirmed that there is a channel selection button to which a frequency that cannot be received is assigned, the second tuner is controlled to check whether the broadcast can be received at the frequency stored in the predetermined storage area,
When it is confirmed that the broadcast can be received at the frequency stored in the predetermined storage area, the frequency stored in the predetermined storage area is assigned to the channel selection button to which the frequency that cannot be received is assigned. The receiving device according to any one of claims 1 to 3.

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