JP2013162383A - Radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio receiver in which a broadcasting station list can be prevented from being updated during traveling in a tunnel or the like, in simple configuration.SOLUTION: A radio receiver comprises a broadcasting station list creation section 42 which creates a broadcasting station list, an approach determination section 43 whether a vehicle enters a tunnel or the like, a get-out determination section 44 which determines whether the vehicle gets out of the tunnel or the like, a list holding section 45 which holds contents of the broadcasting station list when it is determined that the vehicle enters the tunnel or the like, a seek processing section 46 which sweeps a reception frequency in one direction when a user instructs frequency sweeping, and stops sweeping the reception frequency when a broadcast signal is detected, a mute processing section 47 which maintains an output sound in a soundless state in parallel with seek operation, and a list holding determination section 48 which determines to continue or cancel content holding of the broadcasting station list based on a result of the determination by the get-out determination section 44 in parallel with the seek operation.

Description

  The present invention relates to a radio receiver such as RDS (Radio Data System).

  Conventionally, a receiving apparatus that creates a list of receivable broadcasting stations is known (see, for example, Patent Document 1). In this receiving apparatus, a position detection unit such as a GPS determines whether or not a mobile object equipped with the receiving apparatus has entered an area where it is difficult to receive such as an underground facility. ing. As a result, it is possible to avoid a situation where the number of broadcast stations registered in the broadcast station list decreases when the mobile object enters the reception difficulty area.

  Further, conventionally, when the preset reception levels of a plurality of broadcast stations (broadcast station lists) are below a reference value, the preset contents are automatically updated by replacing with a broadcast station whose reception level is above the reference value. A receiving apparatus is known (for example, see Patent Document 2). In this receiving device, the reception level of a plurality of preset broadcast stations is detected and received using a second configuration for searching for a broadcast station provided separately from the first configuration for listening to broadcasts. The preset contents are not updated when there are many broadcasting stations whose levels are below the reference value. This prevents updating of preset contents when entering a tunnel or the like.

JP 2010-268333 A JP-A-6-334490

  By the way, the receiving apparatus disclosed in Patent Document 1 requires a position detection unit such as a GPS and a navigation system that determines whether or not the detected position is included in the difficult reception area. There was a problem. Further, in the receiving device disclosed in Patent Document 2, the second configuration is used so that the audio output of the program being received is not affected, but two configurations for receiving broadcast signals are required. There was a problem that the configuration was complicated. Such a complicated configuration is undesirable because it leads to an increase in cost and the product price.

  The present invention was created in view of the above points, and an object of the present invention is to provide a radio receiver capable of preventing a broadcast station list from being updated while traveling through a tunnel or the like with a simple configuration. Is to provide.

  In order to solve the above-described problems, a radio receiver according to the present invention can be received by a broadcast signal receiving unit that receives a broadcast signal, an audio output unit that outputs sound corresponding to the broadcast signal, and a broadcast signal receiving unit. Broadcast station list creation means for creating a broadcast station list indicating broadcast signals, entry determination means for judging whether or not the broadcast signal has entered an area where reception of the broadcast signal is difficult, based on the reception state of the broadcast signal, and broadcast Based on the reception status of the signal, the escape determination means for determining whether or not the broadcast signal is difficult to receive, and the contents of the broadcast station list when the entry determination means determines that the broadcast has entered. A list holding means for holding a signal, an operating means for receiving a frequency sweep instruction by a user, and reception of a broadcast signal receiving means when a frequency sweep instruction is made by the user using the operating means. The frequency sweep processing means that stops the sweep of this reception frequency when the wave number is swept in one direction and the broadcast signal is detected, and the output of the audio output means is silenced in parallel with the frequency sweep operation by the frequency sweep processing means. In parallel with the frequency sweep operation by the silence sweep processing means and the frequency sweep processing means, the list holding that determines whether to continue or release the contents of the broadcast station list by the list holding means based on the determination result by the escape determination means Determination means.

  Specifically, the list holding determination means described above makes a decision to continue holding the contents of the broadcast station list when the escape determination means determines that it has not escaped from the area, and the escape determination means When it is determined that the user has escaped from the area, a decision is made to release the content of the broadcast station list. In particular, the broadcast signal receiving means described above preferably has a single tuner configuration for receiving one broadcast signal. In addition, it is desirable that the region where it is difficult to receive the broadcast signal to be determined by the entry determination unit and the exit determination unit described above is inside the tunnel and the building.

  Since the reception status of each broadcast signal is detected when performing a frequency sweep operation according to the user's instruction, each broadcast signal is examined without affecting the normal broadcast signal reception operation (audio output). It is possible to simplify the configuration without adding another configuration for detecting the reception state or using a navigation system or the like. In addition, since it is decided to keep or cancel the contents of the broadcast station list depending on whether or not you have escaped from the tunnel, etc., it is possible to prevent the contents of the broadcast station list from being updated while traveling through the tunnel. Can do.

  In addition, it is preferable that the list holding determination unit described above determines whether or not to keep the contents of the broadcast station list before or after the frequency sweep is started by the frequency sweep processing unit. Thereby, it is possible to determine whether or not to keep the contents of the broadcast station list without giving the user a sense of incongruity.

  Moreover, it is desirable that the above-described escape determination means detects the reception state for broadcast signals corresponding to the broadcast station list. Alternatively, it is desirable that the above-described escape determination means detect the reception state for all broadcast signals included in the reception frequency band. Since the number of receivable broadcast signals decreases by entering the inside of the tunnel or the building, it is possible to reliably detect the entry to the inside of the tunnel or the building based on the detection result of the reception state.

  Further, it is desirable that the above-described silence processing means maintains the output silence state during the operation of the list holding determination means. As a result, it is possible to determine whether or not to keep the contents of the broadcast station list using the silent state during the frequency sweep operation, and to prevent the user from feeling uncomfortable.

  In addition, a channel selection processing unit that instructs the broadcast signal reception unit to switch the broadcast signal, and a broadcast station list that updates the content of the broadcast list based on the reception state of the broadcast signal switched by the channel selection processing unit Updating means, and when the decision to continue holding the contents of the broadcasting station list is made by the list holding determination means, the broadcasting station list updating means changes the contents of the broadcasting station list regardless of the reception state of the broadcast signal. It is desirable to hold. Further, it is desirable that the above-described channel selection processing unit instructs switching to any broadcast signal included in the broadcast station list. As a result, even if the reception state of the selected broadcast signal is poor, the contents of the broadcast station list can be maintained if the cause is the entry into a tunnel or the like, and the temporary reception state deteriorates. It is possible to prevent the contents of the broadcast station squirrel from being updated for the reason.

  Further, it is desirable that the above-described entry determination unit determines whether or not the broadcast signal reception unit has entered a region where it is difficult to receive the broadcast signal, based on the reception state of the broadcast signal being received. Unlike entering the tunnel, the reception status of the broadcast signal changes abruptly (deteriorates) when entering the tunnel, so checking the reception status ensures that you have entered the tunnel or building. Can be detected.

It is a figure which shows the structure of the radio receiver of one Embodiment. It is explanatory drawing of the basic baseband coding structure of RDS data. It is a flowchart which shows the operation | movement procedure which switched the content holding state of the produced broadcast station list according to the presence or absence of the approach to a tunnel etc. It is a flowchart which shows the channel selection operation | movement reflecting the determination result of broadcast station list holding | maintenance. It is explanatory drawing of channel selection operation | movement when approaching in a tunnel during driving | running | working and holding | maintaining a broadcast station list | wrist is continued.

  Hereinafter, a radio receiver according to an embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a radio receiver according to an embodiment. The radio receiver shown in FIG. 1 is mounted on a vehicle and receives an RDS broadcast, and includes an antenna 10, a front end (F / E) 12, an intermediate frequency amplifier (IFA) 14, an S meter (signal meter). ) 16, demodulator 20, amplifier 22, speaker 24, RS decoder 30, controller 40, broadcast station list storage unit 50, display unit 60, and operation unit 62. This radio receiver has a single tuner configuration for receiving one broadcast signal.

  In RDS broadcasting, 57 kHz, which is the third harmonic of the 19 kHz stereo pilot signal, is used as a subcarrier, and the subcarrier is amplified by a data signal indicating data related to program-related information or traffic information that is filtered and two-phase coded. Radio data (RDS data) is modulated and the amplitude-modulated subcarrier is frequency-modulated to the main carrier and broadcast.

  FIG. 2 is an explanatory diagram of a basic baseband coding structure of RDS data. As shown in FIG. 2, the RDS data is composed of groups of 104 bits as one group, and each group is composed of 4 blocks (A, B, C, D), and each block is a 16-bit information word. (M0 to m15) and 10-bit check words and offset words (C′0 to C′9).

  In block A, program identification data (PI code: Program Identification Code) indicating a network including country name data and program data is arranged. Block B includes traffic information broadcasting station identification data (TP code: Traffic program Identification code) indicating a traffic information broadcasting station that broadcasts a traffic information program, and program content identification data (PTY code: Program) indicating the type of program. Type code) is arranged. In block C, data relating to the frequency of each station in the network station group broadcasting the same program, that is, alternative frequency data (AF data: Alternative Frequency code) is arranged. In the block D, broadcasting station name data (PS data: Program Service code) such as a broadcasting station name and a network name is arranged.

  The front end 12 extracts a desired broadcast signal from broadcast signals received via the antenna 10 and performs frequency conversion to generate an IF signal (intermediate frequency signal) corresponding to the broadcast wave. The intermediate frequency amplifier 14 amplifies the IF signal output from the front end 12. The S meter 16 detects the signal strength of the IF signal output from the intermediate frequency amplifier 14, that is, the electric field strength of the broadcast signal received by the front end 12.

  The demodulator 20 performs FM demodulation processing and stereo demodulation processing based on the IF signal input from the intermediate frequency amplifier 14. RDS data including program identification data (PI) and program content identification data (TYP) is superimposed on the data after FM demodulation. The audio signal stereo-demodulated by the demodulator 20 is amplified by the amplifier 22 and an audio sound is output from the speaker 24.

  The RDS decoder 30 performs a predetermined decoding process on the data demodulated by the demodulator 20 and restores the RDS data. Further, the RDS decoder 30 performs an operation of detecting an error in the RDS data while maintaining block synchronization and correcting the error. Normally, RDS data error detection and correction operations are separate from the RDS data decoding process, and a separate error detection / correction unit is provided.

  The control unit 40 controls the entire radio receiver. The control unit 40 includes a CPU, a RAM, a ROM, and the like, and performs various operations by executing a predetermined program. For example, it controls the channel selection operation for selecting and receiving programs, the seek operation for searching for receivable broadcast signals by sweeping the frequency in one direction, and the operation for creating a broadcast station list indicating receivable broadcast signals. This is performed under the control of the unit 40. For this purpose, the control unit 40 includes a channel selection processing unit 41, a broadcast station list creation unit 42, an entry determination unit 43, an exit determination unit 44, a list holding unit 45, a seek processing unit 46, a mute processing unit 47, and a list holding determination. Unit 48 and a broadcast station list update unit 49.

  The channel selection processing unit 41 sets the reception frequency corresponding to the received program after switching to the front end 12 when a channel selection instruction (reception program switching instruction) is given by the user using the operation unit 62. Do it. The broadcast station list creation unit 42 creates a broadcast station list indicating receivable broadcast signals. This broadcast station list includes at least program identification data (PI code) corresponding to the broadcast signal of each broadcast station and the reception frequency. In addition, there are several cases regarding the timing for creating the broadcast station list. It is conceivable that the data is created at a timing instructed by the user using the operation unit 62, or is created when the radio receiver is activated or at a predetermined time interval. The created broadcast station list is stored in a broadcast station list storage unit 50 composed of a semiconductor memory, a hard disk device, or the like.

  The entry determination unit 43 determines whether or not the vehicle enters a region where it is difficult to receive the broadcast signal based on the reception state of the broadcast signal. Specifically, the entry determination unit 43 determines whether or not the broadcast signal is difficult to receive based on the degree of change in the reception state of the broadcast signal being received (the output level of the S meter 16). Determine. The output level of the S meter 16 gradually decreases when the traveling vehicle deviates from the reception area of the broadcasting station, but the output level of the S meter 16 decreases when the vehicle enters a parking lot in a tunnel or a building. Decrease suddenly. Therefore, it can be determined that the vehicle has entered a tunnel or the like when the rate of decrease in the output level of the S meter 16 exceeds a predetermined reference value.

  The escape determination unit 44 determines whether or not an escape from an area where it is difficult to receive the broadcast signal based on the reception state of the broadcast signal. The “region where it is difficult to receive a broadcast signal” to be determined by the escape determination unit 44 and the above-described entry determination unit 43 is assumed to be inside a tunnel and a building. Specifically, the escape determination unit 44 determines whether or not the broadcast signal reception state (output level of the S meter 16) included in the broadcast station list has entered a region where it is difficult to receive the broadcast signal. Determine. For example, if all (or more than a predetermined number) of broadcast signals included in the broadcast station list are in good reception and can be received, it can be determined that they have escaped from the tunnel or the like.

  The list holding unit 45 holds the contents of the broadcast station list stored in the broadcast station list storage unit 50 when the entry determination unit 43 determines that the vehicle has entered a tunnel or the like. The seek processing unit 46 sweeps the reception frequency of the front end 12 in one direction when a frequency sweep instruction (seek instruction) is given by the user using the operation unit 62, and the output level of the S meter 16 exceeds a predetermined value. When the broadcast signal is detected, the sweep of the reception frequency is stopped. In parallel with the frequency sweep operation (seek operation) by the seek processing unit 46, the mute processing unit 47 sends an instruction to the demodulating unit 20 to silence the audio sound output from the speaker 24.

  The list holding determination unit 48 determines to continue holding the broadcast station list by the list holding unit 45 when it is determined by the escape determination unit 44 that it has not escaped from the tunnel or the like, and otherwise ( When it is determined that the user has escaped from the tunnel or the like), the list holding unit 45 determines to release the broadcasting station list holding.

  The broadcast station list update unit 49 detects the reception state of the broadcast signal to be received (the output level of the S meter 16) in the channel selection operation using the broadcast station list, and based on the detection result, the broadcast station list The contents of the broadcast station list stored in the storage unit 50 are updated.

  When the display target data is included in the RDS data, the display unit 60 displays this data, and displays channel selection information necessary for control by the control unit 40, the contents of the broadcast station list, and the like. The operation unit 62 is for receiving instructions from the user, and includes various input keys and operation knobs.

  The antenna 10 and the front end 12 described above are broadcast signal receiving means, the intermediate frequency amplifier 14, the demodulating unit 20, the amplifier 22, and the speaker 24 are audio output means, the broadcast list creating unit 42 is a broadcast list creating means, and an entry determining unit. 43 is an entry determination unit, an escape determination unit 44 is an escape determination unit, a list holding unit 45 is a list holding unit, an operation unit 62 is an operation unit, a seek processing unit 46 is a frequency sweep processing unit, and a mute processing unit 47. Corresponds to the silence processing means, the list holding determination section 48 corresponds to the list holding determination section, the channel selection processing section 41 corresponds to the channel selection processing section, and the broadcast station list update section 49 corresponds to the broadcast station list update section.

  The radio receiver of this embodiment has such a configuration, and the operation thereof will be described next. FIG. 3 is a flowchart showing an operation procedure in which the content holding state of the created broadcast station list is switched in accordance with the presence / absence of exit from a tunnel or the like. In the following description, both the tunnel and the interior of the building are referred to as “tunnels”.

  While receiving one of the broadcast signals while the vehicle is traveling (step 100), the entry determination unit 43 determines whether or not the vehicle has entered the tunnel (step 102). If the vehicle has not entered the tunnel, a negative determination is made and this determination is repeated. If the vehicle has entered the tunnel, an affirmative determination is made in the determination in step 102, and then the seek processing unit 46 determines whether or not a seek instruction has been issued by the user (step 106). If no seek instruction is given, a negative determination is made and this determination operation is repeated.

  If the user gives a seek instruction, an affirmative determination is made in step 106. Next, the mute processing unit 47 sends a mute instruction to the demodulating unit 20 so that the audio sound output from the speaker 24 is silenced (step 108). In addition, the seek processing unit 46 sends an instruction to the front end 12 and starts a seek operation for sweeping the frequency in one direction from the current reception frequency (step 110).

  Next, the seek processing unit 46 monitors the output level of the S meter 16 and determines whether or not there is a broadcast signal with a good reception state (the output level is equal to or higher than a predetermined value) (step 112). If no broadcast signal is detected, a negative determination is made. Next, the seek processing unit 46 makes a round of the sweep frequency (for example, when the sweep frequency reaches the upper limit (or lower limit) of the reception band). Then, it is determined whether or not the frequency is switched to the lower limit value (or the upper limit value and the frequency sweep is continued) (step 114). A negative determination is made until one round is made, and the process returns to step 112 to make a one-round determination.

  If a broadcast signal is detected during the frequency sweep operation, an affirmative determination is made in step 112. After that, or when the sweep frequency makes a round and an affirmative determination is made in the determination of step 114, the seek processing unit 46 ends the seek operation (step 116). In this state, a broadcast signal corresponding to a new reception frequency after the seek operation (the same reception frequency as before the start of the seek operation when the sweep frequency makes a round) is received, and a corresponding audio sound is output.

  Next, the escape determination unit 44 sets the reception state (output level of the S meter 16) of each of the plurality of broadcast stations included in the broadcast station list in a predetermined order (for example, the registration order of the broadcast station list or reception). Detection is performed in descending order of frequency (step 118). Further, the escape determination unit 44 determines whether or not the vehicle has escaped from the tunnel (step 120). If the vehicle is traveling in the tunnel and has not escaped, a negative determination is made, and then the list holding determination unit 48 determines to continue holding the broadcast station list (step 122). On the other hand, when exiting the tunnel, an affirmative determination is made in the determination of step 120. Next, the list holding determination unit 48 determines to release the holding of the broadcast station list (step 124).

  Next, reception of the broadcast signal detected in step 112 or the original broadcast signal at the start of the seek operation is started when it is determined in step 114 that the frequency has been completed (step 126). The mute processing unit 47 ends the mute process (step 128). Thereafter, the process returns to step 106 and seek instruction determination is repeated.

  When the decision to continue holding the broadcast station list is made in step 122, a channel selection instruction to switch to any of the broadcast stations included in the broadcast station list is given after this point, and this broadcast is actually performed. When the broadcast signal of the station is switched, the contents of the broadcast station list are maintained without deleting the broadcast station from the broadcast station list even if the reception state of the broadcast signal is bad.

  On the other hand, when the decision to cancel the holding of the broadcast station list is made in step 124, a channel selection instruction to switch to any of the broadcast stations included in the broadcast station list is given after this point, and this broadcast is actually performed. When the broadcast signal of the station is switched, if the reception state of the broadcast signal is poor, the broadcast station list is deleted by deleting the broadcast station from the broadcast station list.

  FIG. 4 is a flowchart showing a channel selection operation reflecting the determination result of the broadcast station list holding. While receiving any one of the broadcast signals (step 200), the channel selection processing unit 41 determines whether or not a channel selection instruction has been made (step 202). If no channel selection instruction is given, a negative determination is made, and the process returns to step 200 to continue receiving the current broadcast signal. If a channel selection instruction is issued, an affirmative determination is made in the determination in step 202, and then the channel selection processing unit 41 switches the broadcast station (broadcast signal) (step 204). Specifically, the channel selection instruction is performed by selecting one of the broadcast stations registered in the broadcast station list, and the channel selection processing unit 41 corresponds to the selected broadcast station (broadcast signal). The broadcast signal is switched by setting the reception frequency to be set to the front end 12.

  Next, the broadcast station list update unit 49 detects the reception state (output level of the S meter 16) of the broadcast signal after switching, and determines whether or not the detected reception state is good (step 206). If the reception state is good, an affirmative determination is made, and the process returns to step 200 to continue receiving the broadcast signal after switching.

  If the reception state is bad, a negative determination is made in the determination of step 206. Next, the broadcast station list update unit 49 determines whether or not the list holding determination unit 48 determines to continue holding the broadcast station list (step 208). If it is determined in step 122 in FIG. 3 that the maintenance of the broadcast station list is to be continued, an affirmative determination is made, and the process returns to step 200 to continue receiving the broadcast signal after switching. On the other hand, if it is determined in step 124 in FIG. 3 that the holding of the broadcast station list is released, a negative determination is made in the determination in step 208. Next, the broadcast station list update unit 49 deletes a broadcast signal (broadcast station) having a poor reception state after switching from the broadcast station list (step 210). Thereafter, the process returns to step 200 and the broadcast signal reception is continued. Since this broadcast signal is poorly received, a channel selection instruction for switching to another broadcast station is usually performed.

  FIG. 5 is an explanatory diagram of the channel selection operation when entering the tunnel while traveling and continuing to hold the broadcast station list. In the example shown in FIG. 5, it is assumed that three broadcast stations indicated by A, B, and C are included in the broadcast station list, and there are broadcasts in the tunnel indicated by D apart from these.

  When the vehicle enters the tunnel while receiving the broadcast signal of the broadcast station A, the contents of the broadcast station list created before and stored in the broadcast station list storage unit 50 are retained (step 104 in FIG. 3). ). Thereafter, when a seek operation is performed and the broadcast station D in the tunnel is detected, a tunnel exit determination (step 120 in FIG. 3) is performed at that time. If the user has not escaped from the tunnel, a decision is made to continue holding the broadcast station list (step 122). After that, the channel selection operation is performed for the broadcasting stations A, B, and C included in the broadcasting station list (all broadcast signals are received poorly because they are in the tunnel), but the decision to continue holding the broadcasting station list is made. Therefore, these broadcasting stations A, B, and C are not deleted from the broadcasting station list, and the contents of the broadcasting station list are retained. When exiting from the tunnel, since the decision to cancel the holding of the broadcast station list is made (step 124), each of the broadcast stations A, B, and C is selected and the reception state is poor. Is deleted from the broadcast station list.

  As described above, in the radio receiver according to the present embodiment, since the reception state of each broadcast signal is detected when performing a seek operation in accordance with a user instruction, a normal broadcast signal reception operation (audio sound output) is performed. The contents of each broadcast signal can be examined without affecting the system), and it is not necessary to add another configuration for detecting the reception state or to use a navigation system or the like, thereby simplifying the configuration. . In addition, since it is decided to keep or cancel the contents of the broadcast station list depending on whether or not you have escaped from the tunnel, etc., it is possible to prevent the contents of the broadcast station list from being updated while traveling through the tunnel. Can do.

  In addition, by deciding whether or not to keep the contents of the broadcast station list after the end of the seek operation and before starting the audio sound output, it is possible to continue holding the contents of the broadcast station list without making the user feel uncomfortable. / Cancel can be determined.

  Escape from tunnels and buildings by detecting the reception status of broadcast signals included in the broadcast station list and deciding whether they have escaped from areas where it is difficult to receive broadcast signals such as tunnels. This can be reliably detected. Further, it is possible to prevent the user from feeling uncomfortable by using the silent state (mute) during the seek operation to determine whether or not to keep the contents of the broadcast station list.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the reception state of each broadcast signal of a plurality of broadcast stations included in the broadcast station list is detected in step 118 of FIG. 3, but all broadcast signals included in the reception frequency band are targeted. Alternatively, the reception state may be detected.

  In the above-described embodiment, the broadcast signal reception state is detected after the seek operation is completed, and it is determined to continue or cancel the content of the broadcast station list (steps 120, 122, and 124 in FIG. 3). May be performed before the start of the seek operation (between steps 108 and 110 in FIG. 3).

  In the above-described embodiment, the radio receiver that receives RDS broadcasting has been described. However, the present invention also applies to other radio receivers such as a DAB (Digital Audio Broadcasting) receiver, other AM receivers, and FM receivers. Can be applied.

  As described above, according to the present invention, since the reception state of each broadcast signal is detected when performing the frequency sweep operation according to the user's instruction, the normal broadcast signal reception operation (audio output) is performed. Each broadcast signal can be examined without affecting it, and it is not necessary to add another configuration or use a navigation system or the like for detecting the reception state, and the configuration can be simplified. In addition, since it is decided to keep or cancel the contents of the broadcast station list depending on whether or not you have escaped from the tunnel, etc., it is possible to prevent the contents of the broadcast station list from being updated while traveling through the tunnel. Can do.

10 Antenna 12 Front end (F / E)
14 Intermediate Frequency Amplifier (IFA)
16 S meter 30 RS decoder 40 Control unit 41 Channel selection processing unit 42 Broadcast station list creation unit 43 Ingress determination unit 44 Exit determination unit 45 List holding unit 46 Seek processing unit 47 Mute processing unit 48 List holding determination unit 49 Broadcast station list update Section 50 Broadcast station list storage section 60 Display section 62 Operation section

Claims (11)

Broadcast signal receiving means for receiving a broadcast signal;
Audio output means for outputting audio corresponding to the broadcast signal;
Broadcast station list creating means for creating a broadcast station list indicating broadcast signals receivable by the broadcast signal receiving means;
Based on the reception state of the broadcast signal, an entry determination means for determining whether or not the broadcast signal has entered into an area where reception is difficult,
Based on the reception state of the broadcast signal, escape determination means for determining whether or not the broadcast signal is escaped from within an area,
List holding means for holding the contents of the broadcast station list when it is determined that the entry determination means has entered,
Operation means for receiving a frequency sweep instruction by a user;
A frequency sweep process for sweeping the reception frequency of the broadcast signal receiving means in one direction when a frequency sweep instruction is given by the user using the operation means and stopping the sweep of the reception frequency when a broadcast signal is detected Means,
In parallel with the frequency sweep operation by the frequency sweep processing means, silence processing means for maintaining the output of the audio output means in a silence state;
In parallel with the frequency sweep operation by the frequency sweep processing unit, based on the determination result by the escape determination unit, a list holding determination unit that determines whether to hold or release the contents of the broadcast station list by the list holding unit;
A radio receiver comprising: In claim 1,
The list holding determination means makes a decision to continue holding the contents of the broadcast station list when it is determined that the escape determination means has not escaped from the area, and the area is determined by the escape determination means. A radio receiver characterized in that, when it is determined that it has escaped from the inside, a decision is made to continue holding the contents of the broadcast station list. In claim 1 or 2,
The radio signal receiver has a single tuner configuration for receiving one broadcast signal. In any one of Claims 1-3,
A radio receiver characterized in that a region where it is difficult to receive a broadcast signal to be judged by the entry judging means and the exit judging means is inside a tunnel and a building. In any one of Claims 1-4,
The radio frequency receiver according to claim 1, wherein the list holding determination unit determines whether or not to hold the contents of the broadcast station list before or after the frequency sweep is started by the frequency sweep processing unit. In any one of Claims 1-5,
The radio receiver according to claim 1, wherein the escape determination means detects a reception state for a broadcast signal corresponding to the broadcast station list. In any one of Claims 1-5,
The radio receiver according to claim 1, wherein the escape determining means detects a reception state for all broadcast signals included in a reception frequency band. In any one of Claims 1-7,
The silent receiver is characterized in that the silent state of the output is maintained during the operation of the list holding determining means. In any one of Claims 1-8,
Channel selection processing means for instructing the broadcast signal receiving means to switch broadcast signals;
Broadcast station list update means for updating the content of the broadcast list based on the reception state of the broadcast signal switched by the channel selection processing means;
The broadcast station list update means further includes the contents of the broadcast station list regardless of the reception state of the broadcast signal when the list hold determination means makes a decision to continue holding the contents of the broadcast station list. A radio receiver characterized by holding. In claim 9,
The radio receiver according to claim 1, wherein the channel selection processing unit instructs switching to any broadcast signal included in the broadcast station list. In any one of Claims 1-10,
The radio receiver according to claim 1, wherein the entry determination unit determines whether or not the broadcast signal reception unit has entered a region where reception of the broadcast signal is difficult, based on a reception state of the broadcast signal being received by the broadcast signal reception unit. .

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