JPH11133134A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically receive a broadcasting wave, a reception state of which is the best at a current position. SOLUTION: A central processing unit 7 selects reception condition data of an operator designated broadcasting service or its similar broadcasting service, of which reception position is a current position, and the reception propagation conditions conform to the current electromagnetic wave propagation state, of a plurality of reception condition data stored in a storage unit 6, and adjusts a receiving unit 4 based upon the reception condition data. Further, if the reception condition data cannot be selected, a plurality of items for receiving at the receiving device 4 a broadcasting service similar to the operator designated broadcasting service, and receivable at the current position and in the propagation state of the current electromagnetic wave are stored as temporarily storage data in the storage unit 6. The temporarily storage data is stored as storage data in the storage unit 6 if broadcasting waves can be continuously received in plurality of times when broadcasting waves are received by adjusting the receiving unit 4 using it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a receiver mounted on a mobile object.

[0002]

2. Description of the Related Art In recent years, receivers mounted on moving bodies including cars and ships, such as radio receivers and television receivers, have a so-called preset function so that an operator can easily perform tuning. It has become mainstream. In the receiver having the preset function, the service area of the broadcasting station and the transmission frequency of the broadcasting station are associated with each other and stored in the memory in advance as preset data in each region, and the name of the stored broadcasting station is moved. Means are provided for designation by the body operator. When this receiver is to receive a broadcast wave transmitted from an operator's desired broadcast station and representing a broadcast program, the operator only needs to specify the name of the desired broadcast station, and the receiver itself is designated by the designated broadcast station. The reception frequency of the receiver is automatically adjusted to the transmission frequency by reading the transmission frequency from the memory and performing tuning based on the transmission frequency.

[0003] In addition, a receiver having a preset function includes a current receiver to simplify tuning and to keep listening to the same broadcast program when a moving object moves over a plurality of service areas. In some cases, a broadcast station whose current position is within a service area is checked using a position and preset data, and tuning is performed using the transmission frequency of the broadcast station. As a prior art of such a receiver, there is a radio receiver disclosed in Japanese Patent Application Laid-Open No. H4-167827. This radio receiving device uses a global positioning system (Global Positioning System) to display the name of the broadcasting station including the current location.
m; hereinafter abbreviated as GPS) receiving device and storage means for storing transmission antenna locations of a plurality of broadcasting stations,
The name of the broadcast station whose transmission antenna location is closest to the current location measured by the GPS receiver is displayed.

In this conventional radio receiving apparatus, the name of a broadcasting station selected according to the distance between the current position and the position of the transmitting antenna is displayed, for example, as a broadcasting station capable of receiving broadcast waves most stably. . In this case, for example, a broadcast station that broadcasts a broadcast program that the operator wants to listen to, a road used by the operator, and a time zone in which the operator listens to the program are different for each operator. Further, the propagation state of the electromagnetic wave is determined by a complex combination of a plurality of factors, and changes in a complex manner according to the combination. These factors include the positional relationship between the location of the receiver and the boundary of the service area of the broadcasting station, the terrain at the location of the receiver and the presence or absence of a building, the frequency band of the broadcast wave to be received, and the reception of the broadcast wave. The propagation time of the electromagnetic wave changes every moment as each factor changes. In particular, when a broadcast wave from a broadcast station in the service area is received at or near the boundary of the service area, the reception state changes drastically due to the terrain at the position of the receiver. As a result, a broadcast wave from a broadcast station having the shortest distance between the current position and the transmitting antenna location cannot always be received most stably. Conversely, even when the position of the receiver is outside the service area, the broadcast wave may be satisfactorily received.

[0005] In a receiver having the above-described conventional preset function, preset data is generally set at a factory when the receiver is created. This existing preset data includes local broadcast stations whose service area is smaller than the general service area, for example, road information radio stations and community broadcasts whose service area is smaller than the service areas of the radio and television broadcast stations. In many cases, station preset data is not stored. In addition, when a new broadcast station of local broadcast or radio broadcast and television broadcast is opened, since the preset data of the broadcast station is not stored in the memory, it is not possible to receive the broadcast wave of the broadcast station by the preset function. difficult. In these cases, in order for the receiver to receive the broadcast waves of the local broadcast station and the new broadcast station by the preset function, the operator must first transmit the transmission frequency and service area data of those broadcast stations to the receiver. Must be newly entered. Therefore, it takes time and effort to receive broadcast waves from these broadcast stations.

When one broadcasting station has a plurality of transmitting stations, a plurality of transmitting stations transmit broadcast waves representing the same broadcast program. In this case, the receiver having the conventional preset function generally stores only the preset data of the master station transmitting station. In order to receive the broadcast wave of the slave station transmitting station having a smaller service area than the master station transmitting station by the preset function, each operator checks the location and transmission frequency of the slave station transmitting station, searches for the preset data, I have to store the found preset data in the memory. Since it takes a lot of time to confirm the location of the transmitting station, it takes time to receive the broadcast waves from these transmitting stations.

Further, among the electromagnetic waves, for example, A
The propagation state of a medium wave used for M radio audio broadcasting changes according to the difference between day and night. Therefore, an AM radio audio broadcast receiver may be able to receive, at night, a broadcast wave from a distant broadcast station that is difficult to receive during the day at the current position. In addition, the propagation state of ultra high frequency waves used for FM radio audio broadcasting changes according to the season. In addition, when a flying object or a meteor exists above the sky, an ultrashort wave may be accidentally reflected due to these accidental factors, and may travel farther than the line-of-sight distance that should be transmitted. Therefore, the FM radio audio broadcast receiver may be able to receive at its current position a broadcast wave from a distant broadcast station that is difficult to receive at the current position in spring, autumn and winter. . For this reason, the broadcast wave that the receiver was able to receive at least once at the current position is always stably received at that position regardless of changes in propagation conditions due to time, season, and accidental factors. It is generally difficult for an operator to judge whether or not it is possible.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to be able to receive an electromagnetic wave transmitted from a broadcasting station using a preset function in accordance with a mode of use of an operator, and to further receive reception condition data used for the preset function. Is to provide a receiver that can be automatically set.

[0009]

SUMMARY OF THE INVENTION The present invention provides a receiving means for receiving an electromagnetic wave, a position measuring means for measuring a position of the receiving means, and a propagation condition detecting means for detecting a propagation condition for grasping a propagation state of the electromagnetic wave. Means, the frequency of electromagnetic waves transmitted from a plurality of broadcasting stations, the position of the receiving means capable of receiving each of the electromagnetic waves and the propagation conditions for receiving the electromagnetic waves at the position, respectively, as the reception conditions The receiving condition storing means for storing, and among the receiving conditions stored in the receiving condition storing means, the position is equal to the position measured by the position measuring means, and the propagation condition is the propagation condition detected by the propagation condition detecting means. A reception control unit that selects an equal reception condition and causes the reception unit to receive an electromagnetic wave having a frequency of the selected reception condition.

According to the present invention, the receiver stores a plurality of reception conditions in the reception condition storage means in advance, and the reception control means controls the position of the receiver measured by the position measurement means and the propagation condition detection means. Selecting one of the plurality of reception conditions based on the propagation condition for estimating the current propagation state of the electromagnetic wave detected by the reception unit, and receiving the electromagnetic wave having the frequency of the selected reception condition by the reception unit. Let it. Thereby, the receiver can always receive the electromagnetic wave stably even when the propagation state of the electromagnetic wave changes due to the time and the season and the receiver moves.
Therefore, the user of the receiver can make the receiver receive the electromagnetic wave without performing a complicated operation even when the position and the propagation state change. Further, by adding the propagation condition to the reception condition, reception failure due to a change in the propagation state is less likely to occur, so that the reliability of the reception condition can be improved.

[0011] The present invention further comprises the step of causing the receiving means to receive an electromagnetic wave having a frequency within a predetermined frequency band in which frequencies of the electromagnetic waves transmitted from the plurality of broadcasting stations are present, and receiving the frequency of the received electromagnetic wave and the electromagnetic wave. The propagation condition detected by the propagation condition detection means at the position and the position measured by the position measurement means at the time, as the reception condition,
It is characterized by further including a learning control means stored in the reception condition storage means.

According to the present invention, the learning control means operates as described above to automatically learn the reception conditions. As a result, the receiver can automatically set and store the reception condition in response to the change in the position of the receiver and the propagation condition. Therefore, the receiving condition can be learned individually for each operator according to the usage mode of the receiver of the operator. For example, it is possible to automatically learn the reception conditions of a newly opened broadcasting station and local broadcasting stations and slave stations. In addition, it is possible to simplify the trouble of the operator of the receiver when the reception condition is stored in the reception condition storage means.

Further, the learning control means adds the propagation condition to the position of the receiver included in the preset data of the conventional receiver, and sets the reception condition by comprehensively evaluating the position and the propagation condition. . Thereby, even when the position of the receiver is outside the transmission range in which the broadcast station transmits the broadcast wave, that is, in a state outside the service area, the electromagnetic wave from the broadcast station can be received due to the propagation state and the position of the receiver. In some cases, it is possible to set and store the reception condition of the electromagnetic wave of the broadcasting station at that position.

For these reasons, the number of broadcasting stations for which reception conditions are set is larger than the number of broadcasting stations for which preset data is set in a conventional receiver. Therefore, the reception control means can select a broadcasting station more finely than the receiver of the prior art.

[0015] The present invention is also directed to the present invention, wherein the receiving means receives an electromagnetic wave having a frequency within a predetermined frequency band in which frequencies of the electromagnetic waves transmitted from the plurality of broadcasting stations exist, and the position measuring means at the time when the electromagnetic wave is received. At the same position and the same propagation condition as the propagation condition detected by the propagation condition detection means at the measured position and the time, whether or not the receiving means can receive the electromagnetic wave of the frequency again plural times continuously. Judgment, if received continuously multiple times,
The frequency, the position, and the propagation condition are stored as reception conditions in the reception condition storage unit, and when reception is not performed a plurality of times continuously, the frequency, the position, and the propagation condition are stored in the reception condition storage unit. It is characterized by further including a learning control means that does not allow the learning control.

According to the present invention, when learning the reception condition, the learning control means grasps the position and propagation state at the time when the electromagnetic wave is received once, and a plurality of electromagnetic waves having the same frequency at the position and propagation condition are obtained. It is determined whether reception can be performed again. This makes it possible to determine whether the electromagnetic wave has been accidentally received. This is for the following reason. The case where the electromagnetic wave is accidentally received is, for example, a case where the electromagnetic wave is propagated outside the transmission range of the broadcasting station and the receiver is outside the transmission range. Since this electromagnetic wave is received only when the atmosphere is in the above-described propagation state, it is difficult to always receive the electromagnetic wave stably, that is, to receive the electromagnetic wave at the same position regardless of the propagation state. This electromagnetic wave is considered to be rarely received continuously more than once when trying to receive it at the same position regardless of the propagation conditions. It can be automatically determined whether or not the received message is received.

Further, the learning control means sets and stores reception conditions only for the electromagnetic waves which can be received a plurality of times. As a result, it is possible to prevent the reception condition of the electromagnetic wave, which is always difficult to receive stably, from being stored in the reception condition storage means. Further, since the electromagnetic wave from the broadcasting station whose position of the receiver is included in the transmission range can be continuously received a plurality of times, the reception condition of the electromagnetic wave can be stored. Therefore, it is possible to automatically learn the newly opened broadcasting station and the receiving conditions for the existing local broadcasting station and the slave station transmitting station for which the receiving conditions are not set. Thus, when the receiving means receives the electromagnetic wave using the reception condition stored in the reception condition storage means, the electromagnetic wave can be reliably received. Therefore, the reliability of the set reception condition can be improved.

Further, according to the present invention, among the reception conditions stored in the storage means, the broadcasting station propagates the electromagnetic wave to outside a predetermined transmission area where the electromagnetic wave is to be transmitted, and the generation rate of the electromagnetic wave increases with time. The present invention is further characterized by further including an erasing means for selecting and erasing a reception condition including a propagation condition for grasping a predetermined propagation state to be increased or decreased.

According to the present invention, the receiver has the erasing means and includes, for example, a propagation condition for grasping the above-mentioned propagation state among the reception conditions stored in the storage means by the learning control means. Delete the reception condition. This is for the following reason. For example, if the occurrence rate of the propagation state increases or decreases with the passage of time, for example, with the transition of seasons, the propagation state occurs and the electromagnetic waves reach outside the transmission area when the occurrence rate increases. The control means
The reception condition of the electromagnetic wave can be set and stored outside the transmission area. However, at the time when the incidence rate decreases, the propagation state is unlikely to occur, so that the electromagnetic wave does not easily reach the position where the reception condition is set. Therefore, even if the reception control means tries to make the receiving means receive the electromagnetic wave using the reception condition, it becomes difficult to receive the electromagnetic wave. Therefore, the reliability of such reception conditions of electromagnetic waves decreases with time. Therefore, the reliability of the reception conditions stored in the storage unit can be improved by deleting such reception conditions later.

Further, as described in claim 3, when the reception condition is stored only for the electromagnetic wave which can be continuously received a plurality of times, when the occurrence rate of the propagation condition is high at the set time, the reception is not performed. Conditions may be stored. In this case, the reliability of the reception condition can be further improved by deleting the reception condition using the above-described erasing means after storing the reception condition.

Further, according to the present invention, the propagation condition detecting means includes:
Based on the frequency of the electromagnetic wave received by the receiving unit, the condition to be detected as the propagation condition is changed to a condition for estimating a change over time in the propagation state of a propagation path that propagates the electromagnetic wave of the frequency, I do.

According to the present invention, the propagation condition detecting means changes the condition to be detected as the propagation condition according to the frequency of the electromagnetic wave. This is for the following reason. For example, the change in the propagation state of the electromagnetic wave corresponds to which of the plurality of propagation paths of the electromagnetic wave in the atmospheric space the electromagnetic wave is propagated. Some propagation paths that propagate electromagnetic waves of each frequency exceptionally propagate the electromagnetic waves according to factors that change with time. The exceptional propagation path differs depending on the frequency of the electromagnetic wave, and the factor of the propagation of the electromagnetic wave differs for each propagation path. Therefore, for each frequency, by setting the condition for estimating the above-described factor of the exceptional propagation path of the electromagnetic wave of the frequency as the propagation condition, in response to the propriety of the electromagnetic wave of the frequency on the exceptional propagation path , Reception conditions can be set. Therefore, when the receiver receives electromagnetic waves in a plurality of frequency bands, for example, both medium waves and ultrashort waves, it is possible to reliably estimate the above-described factors of the exceptional propagation path of the electromagnetic waves in each frequency band. Therefore, it is possible to improve both the reliability of the reception conditions of the electromagnetic waves in both frequency bands.

Further, the present invention is characterized in that the electromagnetic wave is an ultra-short wave, and the propagation condition indicates whether or not the season when the electromagnetic wave is received is summer.

According to the present invention, when the electromagnetic wave is a very short wave, the propagation condition detecting means detects a season difference as a propagation condition. This is for the following reason. For example, when a sporadic E layer occurs, the ultrashort wave changes its propagation state and propagates to a distance longer than the original line-of-sight distance. This sporadic E layer mainly occurs in summer,
This change in propagation state occurs almost in the summer. Therefore, if it is distinguished whether it is summer or not according to the propagation condition, the reception condition is that of the electromagnetic wave reflected and transmitted to the sporadic E layer, or the direct wave and the ground as usual. It can be determined whether or not the signal is an electromagnetic wave transmitted as a reflected wave.

Therefore, for example, Sporadic E
The reception condition of the electromagnetic wave transmitted by the layer can be determined after being stored, and can be erased by the erasing means. Further, it is possible to determine whether or not to use the reception condition of the electromagnetic wave transmitted by the sporadic E layer in response to whether or not the receiving unit receives the electromagnetic wave in summer. As a result, since the reception condition is used only in summer, in which the sporadic E layer is likely to occur, it is possible to prevent electromagnetic waves from being received by using this reception condition in spring, autumn, and winter. Therefore, it is possible to improve the reliability of the reception condition of the ultra high frequency.

Further, the present invention is characterized in that the electromagnetic wave is a medium wave, and the propagation condition indicates whether the time point when the electromagnetic wave is received is day or night.

According to the present invention, when the electromagnetic wave is a medium wave, the propagation condition detecting means detects a difference between day and night as the propagation condition. This is for the following reason. Medium wave
During the day, it travels as ground and space waves, and at night it travels as ionospheric waves in addition to ground and space waves. Electromagnetic waves travel farther when transmitted as ionospheric waves than as ground waves and space waves, and thus travel farther at night than during the day. Therefore, if the difference between day and night is determined according to the propagation condition, it is possible to determine whether the reception condition is that of an electromagnetic wave transmitted during the day or that of an electromagnetic wave that is transmitted at night. In addition, the reception control means can use the reception conditions according to whether the electromagnetic wave is received during the daytime or at night. It is possible to receive electromagnetic waves from a broadcasting station farther than a broadcasting station that can make it possible. Therefore, at night, the number of broadcast stations that can be received at the current location can be increased. As a result, it is possible to finely set the reception conditions according to the usage mode of the operator.

The present invention is also characterized in that the position measuring means is a global positioning system receiver.

According to the present invention, the position measuring means is a GPS
Implemented by the receiver. The GPS receiver can detect the position of the receiver by latitude and longitude with higher accuracy than other position measurement methods. Therefore, by setting the reception condition based on the position measured by the GPS receiver, the accuracy of the position of the reception condition can be improved.

Further, according to the present invention, the reception condition storage means includes:
It is a nonvolatile memory in which data can be written and erased.

According to the present invention, the reception condition storage means is realized by a writable / erasable nonvolatile memory. This non-volatile memory can retain its stored contents without supplying power, and therefore does not consume power just to retain reception conditions. Therefore, the power consumption of the receiver can be reduced as compared with the case where another memory is used.

[0032]

FIG. 1 is a block diagram showing an electric configuration of a receiver 1 according to an embodiment of the present invention. The receiver 1 is a receiver mounted on a mobile body, receives broadcast waves of a plurality of frequency bands, and reproduces a broadcast program from the received broadcast waves. The broadcast wave is an electromagnetic wave transmitted from a predetermined broadcast station and used for broadcasting a broadcast program. In the present embodiment, it is assumed that a broadcast wave of an AM (amplitude modulation) radio broadcast which is a medium wave and a broadcast wave of an FM (frequency modulation) radio broadcast which is a super short wave are received and reproduced. The receiver 1 has a preset function. The preset function means that when an operator of the receiver 1 designates one of a plurality of broadcast stations that can be received by the receiver 1,
This is a function for automatically tuning the receiver 1 itself so that the receiver 1 can receive the broadcast wave of the broadcasting station. The receiver 1 includes an input / output device 3, a receiving device 4, a position measuring device 5, a storage device 6, and a central processing unit 7.

The input / output device 3 is provided for an operator to specify a broadcasting station to be received from a plurality of broadcasting stations and its transmission frequency. The transmission frequency is a frequency of a carrier of a broadcast wave, and is predetermined for each broadcast station. The input / output device 3 includes an operation unit 17 realized by a key matrix, for example, and a display unit 18 realized by a liquid crystal display device, for example.

The receiving device 4 receives a broadcast wave and demodulates the received broadcast wave to reproduce a broadcast program. The receiving device 4 includes a tuner antenna 11 and a tuner unit 1.
2 and a speaker 13. The tuner unit 12 includes one or a plurality of tuners. In the present embodiment, the tuner section 12 includes a main tuner 14 and a sub tuner 15. Each of the tuners 14 and 15 selects one of the plurality of broadcast stations, extracts a broadcast wave of the broadcast station from the plurality of broadcast waves received by the antenna 11, and outputs the extracted broadcast wave. The acoustic signal of the broadcast program is reproduced by demodulating the wave, and the acoustic signal is applied to the speaker 13 to output sound.

The position measuring device 5 is provided for measuring the current position of the receiver 1, and has a GPS receiving circuit 21 and a GPS
This is realized by a GPS receiving device including the receiving antenna 22. The GPS receiving circuit 22 receives signals from a plurality of positioning satellites orbiting the earth orbit by the GPS receiving antenna 21, performs triangulation based on the positions of the positioning satellites using the received signals, and performs the position of the receiver 1. And its traveling direction and the current time are measured. The current position is represented by, for example, latitude and longitude, and they are GPS
Output as data. The position measuring device 5 may measure the current position of the receiver 1 by a position measuring method other than the GPS receiving device.

The storage device 6 stores preset data, storage data, and temporary storage data as reception condition data for the preset function of the receiver 1. The reception condition data is used when the central processing unit 7 causes the reception device 4 to receive broadcast waves using the preset function. Details of each data will be described later. The storage device 6 is realized by a nonvolatile memory capable of writing and erasing data, for example, a flash memory and an SRAM. Therefore, the power consumption of the receiver 1 when storing the reception condition data can be reduced as compared with the case where the RAM is used.

The central processing unit 7 has a memory 24 and a timer 2
5 is included. The timer 25 measures the current date and time, that is, the date and time. The memory 24 stores a control program for controlling each of the devices 3 to 6. The central processing unit 7 reads out the control program from the memory 24 and executes the control program, thereby automatically learning the reception control device for controlling each of the devices 3 to 6 to receive and reproduce the broadcast wave and the reception condition data. As a learning control device. When the broadcast station to be received and its transmission frequency are specified from the input / output device 3, the reception control device roughly measures the position of the receiver 1 measured by the position measurement device 5 and the time measurement unit 25. Based on the date and time and the reception condition data stored in the storage device 6, the reception device 4 is controlled so as to receive the broadcast wave of the designated broadcast station. The learning control device operates in parallel with the reception control device, sets storage and provisional storage data using the reception device 4, the position measurement device 5, and the timer unit 25, and stores the data in the storage device 6.

The central processing unit 7 is realized by a microcomputer, for example. The memory 24 includes, for example,
This is realized by an internal ROM (read only memory) of the microcomputer. Since the central processing unit 7 also serves as the reception control unit and the learning control unit and stores the control program in the internal ROM, the components for controlling each of the devices 3 to 6 can be formed into a single integrated circuit. . Therefore, the number of components for controlling each of the devices 3 to 6 can be reduced.

The structure of the reception condition data will be described in detail below. The preset data is provided in the receiver 1 in advance among the reception condition data, and is prepared for each broadcasting station. The preset data of each broadcast station includes the transmission frequency, name, and series of the broadcast station, and data indicating the service area of the broadcast station. The service area is a transmission range in which a broadcast station transmits its broadcast wave. Within the service area, basically, a broadcast wave from the broadcast station is received in a predetermined good reception state with, for example, little superimposition of noise. can do. A series of broadcast stations is a set of a plurality of broadcast stations that broadcast the same broadcast program, and the same broadcast program can be obtained by demodulating broadcast waves from broadcast stations having different transmission frequencies. The preset data is stored in the storage device 6 at the time of shipment from the factory, for example, and does not cover all broadcasting stations. Therefore, for example, a broadcasting station newly opened after setting the preset data, and a local broadcasting station and a master station transmitting station whose service areas such as community broadcasting stations and slave station transmitting stations are narrower than general radio broadcasting stations Are not stored in the storage device 6 in many cases.

The storage data is reception condition data used when the receiver 1 is at a predetermined position and the propagation state of the electromagnetic wave is in a predetermined state, and the receiver 1 itself is used while the receiver 11 is used. Learn and remember. The stored data of each broadcasting station includes the transmission frequency, name and series of the broadcasting station,
Includes a reception position and reception propagation conditions. The reception position indicates a position where the broadcast wave of the broadcasting station can be received based on the storage data, and is represented by, for example, latitude and longitude. The reception propagation condition indicates a propagation condition at a time when a broadcast wave of the broadcast station can be received based on the storage data. The propagation condition is a parameter for grasping the propagation state of the electromagnetic wave at that time, for example, the transmission path of the electromagnetic wave in the atmosphere. This propagation condition is changed for each frequency band to which the transmission frequency belongs. The temporary storage data is candidate data to be stored data, and is temporarily stored in the storage device 6 during learning of the storage data. The temporary storage data is obtained by adding the continuous number of times that the broadcast wave has been received when the tuner unit 12 is adjusted using the temporary storage data to the storage data.

The reason why the reception propagation condition of the stored data is changed according to the frequency band will be described below. For example, AM broadcasts and FM broadcasts have different frequency bands of electromagnetic waves used as broadcast waves, so that broadcast waves have different propagation conditions in the atmosphere. For example, in the case of AM broadcasting, medium waves are transmitted as terrestrial waves and spatial waves during the daytime, and at night the ionospheric state changes from daytime to reflect the medium waves. And transmitted as ionospheric waves. therefore,
The propagation distance of the medium wave varies greatly according to the difference between day and night, so during the day, only the broadcast wave of a short-range broadcast station can be received, but at night, in addition to the short-range broadcast station, Broadcast waves from distant broadcast stations can be received. A short-range broadcast station is a broadcast station that includes a reception position in a service area, and a long-range broadcast station is a broadcast station that does not include a reception position in a service area.

In the FM broadcasting, the service area of a single transmitting station is smaller than the service area of the transmitting station of the AM broadcasting, and the reception state changes greatly due to the terrain. It is not always possible to stably receive broadcast waves from a station transmitting station. Ultrashort waves generally have the same propagation distance regardless of day or night, but when the sporadic E layer is generated and when there are flying objects and meteors, the ultrashort waves are reflected by them. It grows exceptionally. Therefore, in the summer season when the sporadic E layer is likely to occur in the FM broadcasting, reception at a distant broadcasting station may be possible.

As described above, the propagation state of the electromagnetic wave in the atmosphere changes according to day or night or the season, and the occurrence rate of the exceptional propagation state for transmitting the electromagnetic wave to a distance longer than the original propagation distance is as follows. , And the frequency of microwaves varies according to the season. This difference in the propagation state is caused by, for example, a difference in the transmission path of the electromagnetic wave in the atmosphere. If the frequency of the electromagnetic wave is different, the transmission path is different, and whether or not each transmission path transmits the electromagnetic wave of the frequency is changed. The factors are different for each transmission route. Therefore, when receiving a broadcast wave using stored data, it is necessary to determine whether or not the broadcast wave of the broadcast station can be received under the propagation conditions at that time according to the frequency of the broadcast wave. By changing the type of propagation condition for each frequency band, the data is used as data for estimating an exceptional propagation state in each frequency band.

In the case of medium waves, the difference between day and night is a major factor in determining whether or not broadcast waves can be received. Therefore, the reception propagation condition of the storage and provisional storage data of the AM broadcasting station is time data which is data for determining day or night in order to limit a time zone in which the data can be used. The time data represents, for example, a time zone in which a broadcast wave can be received using the reception condition data in units of one hour. In the case of ultra high frequency waves, the difference in the occurrence rate of the sporadic E layer is a major factor in determining whether or not reception is possible. Therefore, the reception propagation condition of the stored data of the broadcasting station whose transmission frequency is very high frequency is seasonal data for identifying the season in order to identify a broadcasting station that can suddenly receive the data and exclude it later. The season data represents, for example, a season in which broadcast waves can be received using the reception condition data in units of one month.

As a result, the stored data of the broadcasting station of the AM broadcasting includes the transmitting frequency and the name and the series of the broadcasting station, the receiving position,
And time data. Further, the storage data of the FM broadcast broadcasting station is composed of the transmission frequency, name, series, reception position, and seasonal data of the broadcasting station. These items are used when searching for the best broadcast wave reception condition from the same series of broadcast stations. This corresponds to a factor that changes in response to a change in the propagation state. Therefore, by extracting such items from a plurality of factors for specifying the broadcast wave and setting the storage data, the storage data can be used in the above-described case, and the data amount is reduced. can do. Therefore, as much storage data as possible can be stored even when the memory capacity of the storage device 6 is limited.

The operation of receiving broadcast waves in the receiver 1 will be schematically described below. When the tuner unit 12 is adjusted using the preset data of the FM broadcasting station, the central processing unit 7 compares the transmission frequency in the preset data with the frequency of the broadcast wave currently received by the tuner unit 12, and furthermore, The service area in the preset data is compared with the current position represented by the GPS data from the position measuring device 5. If the frequency of the received broadcast wave matches the transmission frequency and the current position is within the service area, it is determined that the broadcast wave can be received stably.

Further, the central processing unit 7 communicates with another broadcasting station whose service area is the vicinity of the end of the service area of the receiving broadcasting station or the area adjacent to the service area including the current position. , The broadcast waves from the other broadcast stations are also to be received. At this time, if the broadcast station in the service area including the current position and the other broadcast station are the same series of broadcast stations, the broadcast wave having the higher received electric field strength of the broadcast waves of both broadcast stations is received. And demodulate. In this case, the name of the broadcast station that received the broadcast wave, the transmission frequency and sequence, the GPS data from the position measurement device 5, and the date and time of reception are stored in the storage device 6 as one temporary storage data. Temporary storage and storage data set in the summer due to accidental reception of a distant broadcasting station caused by Sporadic E layer and accidental reception of a distant broadcasting station caused by flying objects and meteors Then, a process of removing them from the storage device 6 is performed at a later date.

When the tuner unit 12 is adjusted using preset data of an AM broadcast station, the central processing unit 7
Determines whether or not the broadcast wave can be received stably by the same processing as that of the FM broadcast. Further, when the broadcast wave is received during the day, the central processing unit 7 determines whether the current position of the receiver 1 is near the end of the service area of the receiving broadcast station or the current position, as in the case of the FM broadcast. When the area adjacent to the service area including the service area is approached near the boundary with another broadcast station serving as a service area, broadcast waves from the other broadcast stations are also to be received, and a broadcast wave with a higher received electric field strength is received. . And the GP from the GPS receiver
S data, the name and sequence of the broadcasting station, the frequency, and time data indicating that the reception time zone is during the day,
One temporary storage data and the storage device 6 are stored. Further, when the broadcast wave is received at night, not only the broadcast station including the current position within the service area, but also a broadcast station having a service area in an area adjacent to the service area, and a broadcast station that is farther than the broadcast station. Broadcasting stations also receive the signals having a high received electric field strength from among the broadcasting waves of the broadcasting stations and demodulate them. Then, the storage device 6 stores the GPS data from the GPS receiver, the name and sequence of the broadcasting station, the frequency, and the time data indicating that the reception time zone is nighttime as one temporary storage data.

[0049] However, the above-described reception operation at the boundary of the service area and in the vicinity thereof is performed when there is no broadcast station of the same series as the broadcast station currently being received, or when a broadcast station of the same series is currently being received. If the broadcast station is broadcasting a broadcast program different from the broadcast program being broadcast, the process is not executed, and the broadcast wave of the broadcast station in the service area including the current position is received.

FIGS. 2 and 3 are flowcharts for explaining the receiving operation using the preset function performed according to the control program of the central processing unit 7. The reception operation using the preset function of the receiver 1 will be described using these.

For example, when the operator operates the operation unit 17 of the input / output device 3 to input the name of the broadcasting station and the transmission frequency, the process proceeds from step a1 to step a2.
During steps a2 to a10, the central processing unit 7
Operate as a reception control device. In step a2,
The central processing unit 7 performs, based on the operation result of the input / output device 3,
The input of the key operated by the operator is determined. This input determination is preferably performed a plurality of times, for example, to prevent chattering. The central processing unit 7 determines a broadcast station to be received based on the key input result of which the input has been confirmed by the key input determination. Next, in step a3, the central processing unit 7 reads GPS data representing the current position of the receiver 1 from the position confirmation device 5.

Next, the central processing unit 7 executes step a4.
In steps -a9, reception condition data of the broadcast station to be received, which is confirmed in step a2, is obtained. Specifically, first,
In step a4, it is determined whether preset data of a broadcast station to be received is stored in the storage device 6 with reference to all the preset data in the storage device 6. When the preset data is stored, the process proceeds from step a4 to step a5, and the preset data is read from the storage device 6. If the preset data is not stored, the process proceeds from step a4 to step a6.

In step a6, the central processing unit 7 determines whether or not there is stored data of a broadcast station to be received among all stored data in the storage device 6. In this case, the storage data of the broadcast station to be received is such that the reception position matches the position indicated by the GPS data read in step a3, and the reception propagation condition is equal to the current propagation condition. When it is determined that the stored data of the broadcast station to be received is stored, the process proceeds from step a6 to step a7, and the stored data is read from the storage device 6. If the stored data is not stored, the process proceeds from step a6 to step a8.

At step a8, it is determined whether or not the temporary storage data of the broadcast station to be received, confirmed at step a2, is included in all the temporary storage data in the storage device 6. The details of this determination are the same as the details of the determination in step a6, except that the processing target is all temporary storage data. When it is determined that the temporary storage data of the broadcast station to be received is stored, the process proceeds from step a8 to step a9, and the temporary storage data is read from the storage device 6. If the temporary storage data is not stored, step a8 to step a8
Proceed to 11. When the reception condition data of the broadcasting station confirmed in step a2, that is, any of the preset data, storage data, and temporary storage data of the broadcasting station is stored in the storage device 6 by the processing of steps a4 to a9. , And the data is read.

Next, at step a10, the central processing unit 7
Is a tuner section of the receiving device 4 that receives and selects and demodulates a broadcast wave of a broadcast station to be received by the receiver 1 based on the transmission frequency of the reception condition data read in the processing of steps a4 to a9. Adjust 12 As a result, the tuner unit 12 selects a broadcast station to be received, and starts receiving a broadcast wave of the broadcast station and reproducing a broadcast program from the broadcast wave.

If it is determined in step a8 that there is no temporary storage data, the preset data of the broadcasting station to be received and the storage and temporary storage data of the broadcasting station in the current position and the current propagation state are stored in the storage device 6. Not. Therefore, the central processing unit 7 performs steps a11 to a2
In 5, the receiver 1 operates as a learning control device in order to make it possible to receive a broadcast station that can be received at the current position and the current propagation conditions using the preset function.

When operating as a learning control device, the central processing unit 7 first scans the frequency using the tuner unit 12 in step a11 to search for a broadcast station that can receive a broadcast wave. Specifically, the tuner unit 12 causes the receiving device 3 to receive the broadcast wave while changing the frequency of the broadcast wave to be received. For example, when the received electric field strength of the received broadcast wave is equal to or higher than a predetermined reference received electric field strength, the central processing unit 7 determines that the broadcast wave is receivable, and is capable of receiving the broadcast station transmitting the broadcast wave. Is considered to be a suitable broadcasting station. Further, the central processing unit 7 causes the storage device 6 to temporarily store the transmission frequency of the received broadcast wave.

The broadcast wave to be received by the tuner unit 12 is
For example, the broadcast waves are broadcast waves of all the same-series broadcast stations that include the current position of the receiver 1 in the service area and have the same series as the broadcast station to be received. Also, when the current position of the receiver 1 is at and near the boundary of the service area of the same-series broadcasting station, or the boundary of the service area of another broadcasting station where the same-series broadcasting station and the service area are adjacent and have the same series. And when it is near the broadcast wave, the broadcast wave of the other broadcast station may be included in the broadcast wave to be scanned. In this case, if the broadcast waves of the same-series broadcast station and the other broadcast station can be received together, the received electric field strengths of both broadcast waves are compared, and the broadcast wave of the stronger received electric field strength is compared. Is regarded as a broadcast wave that could be received.

Next, at step a12, the central processing unit 7 determines whether or not a broadcast station that can be received by the receiver 1 has been found by the processing at step a10. If there is no receivable broadcast station, the current position of the receiver 1 cannot receive broadcast waves from all broadcast stations,
In step a27, the processing operation of the flowchart ends. If there is a receivable broadcast station, the process proceeds from step a12 to step a13, and in steps a13 to a16,
The temporary storage data of the broadcasting station is set.

First, in step a13, the central processing unit 7
Determines whether the transmission frequency stored in step a11 belongs to the medium frequency band or the ultra high frequency band. Step a11
If the received broadcast wave is a medium wave, the process proceeds from step a13 to step a14. If the broadcast wave is a very short wave, the process proceeds from step a13 to step a15. In step a14, the central processing unit 7 sends the position a
The GPS data measured at the time when the broadcast wave is received at 11 is read, and the time data representing the time at that time is read from the timer unit 25. In step a15, the central processing unit 7
Reads the GPS data measured at the time of receiving the broadcast wave from the position measuring device 5 in step a11, and reads the GPS data.
From 5, the season data representing the season at that time is read. After each data is obtained in steps a14 and a15, step a1
Proceed to 6.

At step a16, the central processing unit 7
In step a10, temporary storage data of a broadcast station that is a receivable broadcast station is set and stored in the storage device 6. Specifically, the GPS data obtained in Steps a14 and a15 is set as the reception position of the temporary storage data, and the frequency stored in Step a11 is set as the transmission frequency. Step a1
1 if the frequency stored in the storage device 6 belongs to the medium wave band, the reception propagation condition of the temporary storage data is the time data obtained in step a14, and if the frequency belongs to the ultra high frequency band, the reception propagation condition is The seasonal data obtained in step a15 is used. Thereby, the type of the reception propagation condition can be changed according to which frequency band the transmission frequency of the broadcast wave of the temporary storage data belongs to. Further, a name and a sequence of a broadcasting station having the frequency as a transmission frequency are searched from a plurality of preset data stored in the storage device 6, and a name and a sequence of the broadcasting station in the searched preset data are temporarily determined. The name and series of the broadcast station of the stored data. In addition, the names and series of newly established broadcasting stations and local broadcasting stations are stored in the storage device 6 in advance, and if these are also searched for in addition to the preset data, a broadcast without preset data is performed. Station temporary storage data can be set.

After setting the temporary storage data, the process returns from step a16 to step a3, and the processes of steps a2 to a9 are performed again. At this point, if at least one of the current position of the receiver 1 and the current propagation condition has changed, the changed current position and propagation condition are set as the reception position and the reception propagation condition, and the broadcast station to be received or the same series as the broadcast station If the reception condition data exists, the data is quoted, and if not, the processes of steps a11 to a16 are performed again. Also,
If there is no change in the current position and propagation conditions, step a
In 16, the temporary storage data is set using the current position and propagation conditions at this time as the reception position and the reception propagation conditions, and the temporary storage data is cited. When any of the reception condition data is quoted, steps a5, a7, a9
Then, the process proceeds to step a10, where the central processing unit 7 adjusts the tuner unit 12 using the cited reception condition data.

Next, in steps a17 to a25, the central processing unit 7 operates again as a learning control device. Schematically, the central processing unit 7 first determines in step a17 whether or not a broadcast wave from the broadcast station selected by the receiving device 4 in step a6 can be stably received.
Specifically, it is determined whether or not the received electric field intensity of the broadcast wave currently received by the tuner unit 12 is equal to or higher than a predetermined reference received electric field intensity. If so, it is determined that a broadcast wave from the selected broadcasting station can be received, and the process proceeds from step a17 to step a18. If not,
Determining that the broadcast wave is unreceivable;
The process proceeds from step 17 to step a21.

In step a18, the central processing unit 7
It is determined whether the calendar of the chronology is comparison data. That is, it is determined whether or not the current date and time measured by the timer unit 25 is a date and time when the saving process routine should be executed.
The storage processing routine is for determining whether the propagation state of the electromagnetic wave is a seasonal factor based on the data of the change of day and night of the year based on the calendar of the year, and is executed, for example, on a monthly basis. If so, step a
The process proceeds from Step 18 to Step a19, and if not, the process returns from Step a18 to Step a17. As a result, when tuning is performed using the quoted reception condition data, reception is performed from the time when the tuner unit 12 is adjusted in step a10 to the time when the calendar of the chronology becomes comparison data. If the broadcast wave from the power station to be received continues to be received, the determinations in steps a17 and a18 are repeated.

Steps a19 and a20 are a first storage processing routine for determining whether the temporary storage data is changed to the storage data or stored as it is. Central processing unit 7
First, in step a19, the provisional storage data was used to adjust the tuner unit 12 in step a10, and the tuner unit 12 was adjusted using the provisional storage data to receive the broadcast wave. It is determined whether or not it has been repeated a plurality of times. This determination is affirmed, for example, when the number of consecutive times in the temporary storage data is equal to or greater than a predetermined number of times, and is denied when it is less than the number of times. In this embodiment, the prescribed number of times is three. If the determination is negative, the process returns from step a19 to step a17. If the determination is affirmative, steps a19 to a20
Proceed to.

In step a20, the temporary storage data used for the adjustment of the tuner unit 12 in step a10 is changed to storage data and stored in the storage device 6, and all the temporary storage data relating to the newly stored storage data is stored. Storage device 6
Remove from. Thus, the capacity of the data stored in the storage device 6 can be reduced, and the storage device 6 can be used effectively. After storing the stored data, the process returns from step a20 to step a17, and the determinations in steps a18 and a19 are repeated.

At step a21, the central processing unit 7
By the same processing as in step a18, it is determined whether the calendar of the chronology is comparison data. If not, the process proceeds from Step a21 to Step a26; otherwise, the process proceeds from Step a21 to Step a22.
In steps a22 to a25, the central processing unit 7 is a second storage processing routine for storing and deleting the storage data and the temporary storage data in order to set annual calendar data.

The central processing unit 7 first executes step a22
Then, it is determined whether or not the stored data has been used for adjusting the tuner unit 12 in step a10. If so, the process proceeds from step a22 to step a23, where the storage data is stored as temporary storage data in the storage device 6, and the storage data is deleted. If not, step a22
Then, the process proceeds to step a24 to determine whether or not the temporary storage data is used for adjusting the tuner unit 12 in step a10. If so, from step a24 to step a2
The program proceeds to step 5 where the temporary storage data is deleted from the storage device 6. Otherwise, the tuner unit 12 in step a10
Since the preset data is used for the adjustment, the process proceeds from step a24 to step a26 without changing or deleting the data. After the change and deletion of the data are completed, the process proceeds from Steps a23 and a25 to Step a26.

At step a26, the central processing unit 7
It again operates as a reception control device, and determines whether or not to confirm the presence or absence of reception condition data of a broadcast station other than the broadcast station to be received determined in step a2. For example, when there are a plurality of reception condition data, there is a possibility that there is available reception condition data when the current position of the receiver 1 changes or the current propagation state changes, so the reception condition data is checked again. Step a2
The judgment of 6 is affirmed. If there is no reception condition data other than the reception condition data of the broadcasting station determined in step a2, there is no usable reception condition data.
The determination at 26 is negative. If the determination is affirmative, the process returns from step a26 to step a3. If the determination is negative, the process returns from step a26 to step all. This is the end of the description of the flowchart.

Step a1 in the flowcharts of FIGS.
The reasons for performing the processes 1 to a16 and a19 to a25 and the effects thereof are as follows.

When the receiver 1 is able to receive any one of a plurality of broadcast stations under a new reception position and a new propagation condition, the broadcast wave is transmitted to the reception position It is difficult to determine whether stable reception is always possible under the propagation conditions by only one reception. For example, when the broadcast wave is a very short wave, a broadcast wave of a distant broadcast station may be accidentally received due to accidental reflection caused by a sporadic E layer, a flying object, a meteor, or the like. Since it is difficult to always stably perform reception by such accidental reflection, it is not appropriate to store reception condition data of the broadcast station including the reception position. Since the above-mentioned accidental reflection rarely occurs every day, this accidental reception is unlikely to occur every day. Therefore, for example, when the broadcast wave of the broadcast station is received at the reception position for three consecutive days,
There is almost no possibility of receiving this broadcast wave for three days. On the other hand, when the broadcast wave is from a new broadcasting station and a local broadcasting station, if the receiving position is within the service area of those broadcasting stations, the reception can be always performed. Therefore, when the broadcast wave of the broadcast station is received at the reception position for three consecutive days, the broadcast wave can be always received for three days.

If the broadcast waves of any one of the broadcasting stations can be received under the new receiving position and the new propagation condition by the processing of steps a11 and a12, the processing of the broadcasting station is performed in steps a13 to a16. The reception condition data is temporarily stored as temporary storage data. Thereafter, when the temporary storage data is further used for adjusting the tuner unit 12, the number of times that the broadcast wave can be received, that is, the broadcast wave of any of the broadcast stations is transmitted under the new reception position and the new propagation condition. The number of times of continuous reception is stored. In this state, if the above-described respective storage processing routines are executed, the temporary storage data is stored or deleted according to the following conditions.

First, the temporary storage data that can be received at the time of executing the first storage processing routine and that has been able to receive broadcast waves a plurality of times in succession is changed to storage data in the processes of steps a19 and a20. . For example, temporary storage data of a newly-installed broadcast station and a local broadcast station satisfy the above-described conditions because broadcast waves can always be received when they are used for adjustment of the tuner unit 12, and therefore, are stored as storage data in the storage device 6. It is memorized. Also, the temporary storage data that can be received at the time of executing the first storage processing routine and the number of times that the broadcast wave can be continuously received is less than the specified number of times remains the temporary storage data, and the second storage processing The temporary storage data that cannot be received at the time of execution of the routine is deleted by the process of step a25. For example, the temporary storage data stored by accidental reception satisfies the above-described conditions because it cannot always receive a broadcast wave when it is used for adjusting the tuner unit 12; Left or erased. This prevents the temporary storage data stored by accidental reception from being stored in the storage device 6 and allows the storage device 6 to always store only the storage data of a broadcasting station that can receive broadcast waves. . Therefore, the reliability of the stored and temporarily stored data can be improved.

Further, the storage data that cannot be received during execution of the second storage processing routine is changed to temporary storage data.
For example, if temporary storage data set by accidental reception in summer is erroneously stored as storage data, it is often unreceivable in seasons other than summer, so that temporary storage data is returned to that season. be able to. Thereafter, if the broadcast wave cannot be received even if the tuner unit 12 is adjusted using the temporary storage data, the temporary storage data is stored in step a2.
5 is deleted. Thereby, the stored data stored by accidental reception in summer can be erased in seasons other than summer. That is, by executing the second storage processing routine, the central processing unit 7 operates as an erasing device for erasing stored data set and stored based on accidental reception from the storage device 6 later. Therefore, only the storage data of the broadcasting station that can be received at all times of the year can be stored in the storage device 6.

Further, for example, the provisional storage data of an AM broadcasting station includes a time zone in which the provisional storage data can be used as a reception propagation condition. Therefore, when an AM broadcast station is designated by the operator as a broadcast station to be received, temporary storage data in a time zone including the designated time is selected, so that the same broadcast station can be selected according to the designated time. Different temporary storage data is used. Therefore, even in the temporary storage data of a distant broadcasting station, if the broadcasting wave of the broadcasting station can be continuously received a plurality of times at night, for example,
The temporary storage data is stored as storage data. Thereby, the temporary storage data of a distant broadcasting station can always be received when broadcast waves can be received a plurality of times continuously using the temporary storage data during a receivable time zone. Is changed to stored data. That is, it is possible to determine whether or not the temporary storage data of the AM broadcasting station can be continuously received in each available time zone.

The above-described receiver 1 stores storage data and temporary storage data as reception condition data in addition to the preset data. Therefore, the receiver 1 can automatically learn reception condition data of a broadcast station having no preset data. For example, it is possible to automatically set reception condition data of a broadcasting station for which preset data is not prepared at the time of shipment of the receiver 1, such as a road information radio and a community broadcast, which are expected to have more service points in the future. This allows the receiver 1 to receive a broadcast station having a smaller service area than a general broadcast station using the preset function. As described above, the receiver 1 can have more detailed reception condition data than the receiver having the conventional preset function.

The receiver 1 can execute another receiving operation using the receiving operation using the preset function. First to third examples of other receiving operations will be described below.

In the first example, the central processing unit 7 determines that the current position of the receiver 1 is the service area of the receiving broadcasting station based on the latitude and longitude indicated by the GPS data read from the position measuring device 5. Then, the reception condition data of the broadcasting station is read and analyzed to determine the sequence of the broadcasting station being received. With this, when the current position is near the boundary of the service area, the reception field strength of the broadcast wave of the broadcast wave of another broadcast station that is adjacent to the service area of the broadcast station whose service area is being received among the broadcast stations of the same sequence and the current position is Comparing with the reception electric field strength of the broadcast wave being received, if the reception electric field strength of the broadcast wave of another broadcast station is higher than the reception electric field strength of the broadcast wave currently being received, the broadcast wave of the other broadcast station Can be received by the receiver 1. Further, if this operation is performed when the receiver 1 sequentially moves through the service areas of a plurality of broadcasting stations having the same series, it is possible to always receive the broadcast waves of the broadcasting stations of the series. It is possible to continuously listen to the same broadcast program.

In the second example, the storage and provisional storage data of the broadcasting station of the AM broadcast includes a usable time zone as a reception propagation condition. It is possible to ascertain the time zone in which the broadcast wave from can be received. As a result, the number of broadcast stations that can be received at the position of the receiver at that time using the reception condition data at night can be increased as compared with the daytime. Therefore, when the receiver 1 is moving at night, the central processing unit 7 uses the reception condition data receivable in that time zone to determine which of the receivable broadcast stations should be among the receivable broadcast stations. It is possible to select and receive a broadcast wave of a broadcast station having a good reception state from broadcast stations of the same series. Therefore, it is possible to always select a broadcast station from which broadcast waves can be more easily received.

The tuner section 12 is provided with a plurality of tuners because, as in the above-described first and second examples, when a plurality of broadcasting stations of the same system are sequentially selected and received, the receiver 1 is used. This is because a good reception state is always maintained without interrupting the reproduction of the broadcast programs broadcasted simultaneously by those broadcast stations. For this purpose, the main tuner 14 and the sub tuner 15 select and demodulate broadcast waves of mutually different broadcast stations among a plurality of broadcast stations that can be received by the receiver 1 at the current position and have the same sequence. It is preferable that the audio signal output from one of the tuners having the better reception condition is always selected and output from the speaker 13.

In the third example, a priority order of use is set for the reception condition data cited for use in the adjustment of the tuner unit 12, and the priority order of the storage and temporary storage data of the community service broadcasting station is set. Higher than the priority of the broadcasting station. Thereby, the broadcast wave of the community service broadcasting station can be received with the highest priority.
In addition, even if the broadcast wave of a broadcasting station other than the running community service is received, when the user enters the service area of the community service broadcasting station, the broadcasting wave of the broadcasting station of the service is automatically received, and the service wave of the broadcasting station is further received. After passing through the area, it is also possible to select a broadcast station that was received before entering the service area again.

As described above, the receiver 1 can automatically select a channel corresponding to the information required by the user of the receiver in the best condition. Also, receiver 1
Is installed in a vehicle, the receiver 1 itself automatically selects a channel, so that the driver does not need to select a channel while the vehicle is running, and the driver can easily perform an operation for selecting a channel. Become. Furthermore, since the number of reception condition data is larger than that of the conventional receiver, the reception operation required by the operator can be performed easily and simply by using this data. Further, the above-mentioned other receiving operation can be automatically made to correspond to a newly opened broadcasting station or road information radio station.

Further, when the receiver 1 designates a broadcast station to be received, it is preferable to perform the designation by the method described below. The central processing unit 7 acquires the current position of the receiver from the position measuring device 5, reads a map of an area including the position from the storage device 6, and displays the map as a graphic on the display unit 18, that is, as a graphic. . Furthermore, in correspondence with the displayed map, the names and transmission frequencies of the receivable broadcasting stations when the receiver is located within the area of the displayed map are listed in a list format, for example, and the displayed map is displayed. Display in association. As a result, the operator can reliably and easily know the broadcast stations that the receiver 1 can receive at the current position using the preset function. The operator selects a broadcast station to be received from the displayed broadcast station table, and operates the operation unit 17 to input the selected broadcast station to the receiver 1. Thus, the operator can easily select a desired broadcast station from broadcast stations that can be received at the current position of the receiver 1 and designate the desired broadcast station as the receiver. In addition, even if the touch panel is provided on a liquid crystal display, a preset on a road to be moved in advance can be performed on a map.

As described above, the receiver 1 can be installed on a moving body such as a car or a ship, and can be broadcast program desired by the operator regardless of whether the moving body is moving or stopped. Can be reproduced from a broadcast wave from a broadcast station whose reception state is the best at the current position and propagation state. The structure and behavior of this receiver are based on AM broadcast and F
The present invention is not limited to M broadcasting, and can be applied to a receiver using electromagnetic waves in other frequency bands. Also, not limited to radio broadcasting,
The present invention can be applied to a receiver for receiving other broadcasts such as a television broadcast, and may be applied to any receiver that receives electromagnetic waves without being limited to broadcasts.

[0085]

As described above, according to the present invention, the reception control means of the receiver uses the plurality of reception conditions stored in the reception condition storage means in advance to determine the current position of the receiver and the current propagation state of the electromagnetic wave. The receiving means is controlled based on this. Thereby, the receiver can always receive the electromagnetic wave stably and automatically even when the propagation state of the electromagnetic wave changes and the receiver moves.

Further, according to the present invention, the learning control means automatically sets the receiving condition according to the position of the receiver and the propagation state of the electromagnetic wave. Therefore, since the receiving conditions can be set according to the usage mode of the receiver by the operator, the number of broadcasting stations to which the receiving conditions are set increases compared to the conventional preset data. Therefore, the reception control means:
Broadcasting stations can be selected more finely than when only preset data is used.

Further, according to the present invention, when setting the reception condition, the learning control means can receive the electromagnetic wave of the same frequency a plurality of times again at the position and propagation state when the electromagnetic wave is received once. It is determined whether or not.
This makes it possible to determine whether the electromagnetic wave has been accidentally received. Therefore, it is possible to prevent the setting of reception conditions for a broadcasting station that has transmitted an electromagnetic wave that has been accidentally received, and to set a newly opened broadcasting station, a local broadcasting station and a slave station for which existing reception conditions are not set. The receiving conditions for the transmitting station can be automatically set. Thereby, the reliability of the reception condition can be improved.

Further, according to the present invention, the receiver receives the reception condition stored in the storage unit by the learning control unit.
The reception condition of the electromagnetic wave which becomes difficult to receive with the transition of the season is deleted. Thus, the reliability of the reception condition stored in the reception condition storage unit can be further improved.

Further, according to the present invention, the propagation condition is changed to a condition for estimating the presence or absence of exceptional propagation of the electromagnetic wave according to the frequency of the electromagnetic wave. Thus, when the receiver receives electromagnetic waves in a plurality of frequency bands together, it is possible to improve both the reliability of the reception conditions of the electromagnetic waves in both frequency bands.

According to the present invention, when the electromagnetic wave is an ultrashort wave, a seasonal difference is detected as a propagation condition. Based on this propagation condition, the reception condition set when an exceptional propagation caused by the sporadic E layer occurs can be removed later, so that the reliability of the ultrashort wave reception condition can be improved. .

Further, according to the present invention, when the electromagnetic wave is a medium wave, a difference between day and night is detected as a propagation condition. As a result, the number of broadcast stations that can be received at night at a single location can be increased as compared with the daytime. As a result, it is possible to finely set the reception conditions according to the usage mode of the operator.

According to the present invention, the receiver measures the position by the GPS receiver. As a result, the accuracy of the position of the reception condition can be improved. Furthermore, according to the present invention, the receiver stores the reception condition in the nonvolatile memory. Thereby, the power consumption of the receiver can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a receiver 1 according to one embodiment of the present invention.

FIG. 2 is a flowchart for explaining a control program of a central processing unit 7;

FIG. 3 is a flowchart for explaining a control program of a central processing unit 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiver 3 I / O device 4 Receiving device 5 Position measuring device 6 Storage device 7 Central processing unit

Claims (9)

[Claims] 1. A receiving means for receiving an electromagnetic wave, a position measuring means for measuring a position of the receiving means, a propagation condition detecting means for detecting a propagation condition for grasping a propagation state of the electromagnetic wave, and a plurality of broadcast stations. A reception condition storage unit that stores, as a reception condition, a frequency of an electromagnetic wave to be transmitted, a position of a reception unit that can receive each of the electromagnetic waves, and a propagation condition for receiving the electromagnetic wave at the position. Among the reception conditions stored in the reception condition storage unit, a position whose position is equal to the position measured by the position measurement unit, and a propagation condition whose propagation condition is equal to the propagation condition detected by the propagation condition detection unit are selected, A reception control unit for causing the reception unit to receive the electromagnetic wave having the frequency of the selected reception condition. 2. The method according to claim 1, wherein the receiving unit receives an electromagnetic wave having a frequency within a predetermined frequency band in which frequencies of the electromagnetic waves transmitted from the plurality of broadcasting stations are present. 2. A learning control unit for storing the position measured by the position measuring unit and the propagation condition detected by the propagation condition detecting unit at the time as the reception condition in the reception condition storing unit. The receiver described. 3. The receiving means receives an electromagnetic wave having a frequency within a predetermined frequency band in which frequencies of the electromagnetic waves transmitted from the plurality of broadcasting stations are present, and the position measuring means measures the electromagnetic wave when the electromagnetic wave is received. Determine whether the receiving means can receive the electromagnetic wave of the frequency again at the same position and the same propagation condition as the position and the propagation condition detected by the propagation condition detecting means at the time and a plurality of times continuously, If received continuously a plurality of times, the frequency, the position, and the propagation condition are stored as reception conditions in the reception condition storage means.If reception is not performed continuously a plurality of times, the frequency, the position, and the propagation condition are not received. 2. The receiver according to claim 1, further comprising a learning control unit that does not store the following in the reception condition storage unit. 4. A method according to claim 1, wherein, among the reception conditions stored in said storage means, the broadcast station propagates the electromagnetic wave to outside of a predetermined transmission area where the electromagnetic wave is to be transmitted, and its generation rate increases and decreases with time. 4. The receiver according to claim 2, further comprising an erasing unit for selecting and erasing a reception condition including a propagation condition for grasping a predetermined propagation state. 5. The propagation condition detecting means, based on a frequency of the electromagnetic wave received by the receiving means, determines a condition to be detected as the propagation condition by changing a propagation state over time of a propagation state of a propagation path for propagating the electromagnetic wave of the frequency. The receiver according to claim 1, wherein the condition is changed to a condition for estimation. 6. The receiver according to claim 1, wherein the electromagnetic wave is an ultrashort wave, and the propagation condition indicates whether or not the season when the electromagnetic wave is received is summer. 7. The receiver according to claim 1, wherein the electromagnetic wave is a medium wave, and the propagation condition indicates whether a time point when the electromagnetic wave is received is day or night. 8. The receiver according to claim 1, wherein said position measuring means is a global positioning system receiver. 9. The receiver according to claim 1, wherein said reception condition storage means is a nonvolatile memory capable of writing and erasing data.