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DESCRIPTION JP2009133774

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DESCRIPTION JP2009133774
PROBLEM TO BE SOLVED: To facilitate the work of setting the frequency of a modulated signal
to be transmitted. SOLUTION: The navigation device can be mounted on a vehicle, and a TV
receiver and a memory I / F for acquiring an audio signal, and the acquired audio signal into a
modulation signal of any one of a plurality of frequencies. An FM transmitter that modulates and
transmits, a ROM storing a frequency table A in which frequencies selected from a plurality of
frequencies are associated with each of a plurality of areas, and an area designation accepting
unit for accepting designation of any of a plurality of areas S01) and transmission control means
(S05) for modulating the FM transmitter with the modulation signal of the frequency
corresponding to the received area and the frequency table A. [Selected figure] Figure 2
Voice playback device
[0001]
The present invention relates to an audio reproduction apparatus, and more particularly to an
audio reproduction apparatus that can be mounted on a vehicle.
[0002]
In recent years, navigation devices having an FM transmitter for transmitting an FM modulated
signal from an antenna have appeared.
The FM transmitter converts an audio signal output from the navigation device into a modulated
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signal of the frequency of FM, and transmits the modulated signal. Since the frequency of the
modulated signal transmitted by the FM transmitter may overlap with the frequency band used
by the FM broadcast station, it is necessary to transmit a modulated signal of a different
frequency. JP-A-9-130699 (Patent Document 1) describes an FM transmitter that transmits a
modulation signal of a frequency selected by the user from a plurality of frequencies.
[0003]
However, in order to set the frequency used by the FM transmitter so that the user does not
interfere with the frequency used by the FM station, it must know the frequency used by all the
FM stations. In particular, since the navigation device is mounted on a vehicle, the user has to
know the frequency band used by all the FM stations covering the area to which the vehicle is
moving. Therefore, there is a problem that the task of selecting the frequency to be set to the FM
transmitter is difficult. JP-A-9-130699
[0004]
The present invention has been made to solve the above-mentioned problems, and one of the
objects of the present invention is to provide an audio reproduction apparatus that facilitates the
task of setting the frequency of a modulation signal to be transmitted.
[0005]
Another object of the present invention is to provide an audio reproduction apparatus capable of
transmitting a modulation signal of a frequency which does not interfere with a frequency used
by a broadcasting station.
[0006]
According to an aspect of the present invention for achieving the above-described object, the
audio reproduction device is an audio reproduction device mountable on a vehicle, and is
acquired by an audio acquisition means for acquiring an audio signal and an audio acquisition
means And transmitting means for modulating the voice signal into a modulation signal of any
one of a plurality of frequencies, and storing means for storing each of a plurality of areas and a
frequency selected from a plurality of frequencies in association with each other And region
designation receiving means for receiving designation of any of a plurality of regions, and
transmission control means for causing the transmission means to modulate the acquired voice
signal into a modulation signal of a frequency associated with the received region. .
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[0007]
According to this aspect, each of the plurality of regions and the frequency selected from the
plurality of frequencies are stored in association with each other, and when any one of the
plurality of regions is received, the acquired voice signal is received And modulated to a
modulated signal of the frequency associated with the
By associating each of the plurality of regions with a frequency not already used from the
plurality of frequencies, the modulation signal of the already used frequency is not transmitted,
so that the modulation signal can be transmitted at a frequency that does not cause interference.
As a result, it is possible to provide an audio reproduction apparatus capable of transmitting a
modulation signal of a frequency that does not interfere with the frequency already used.
Further, the user does not need to know the frequency used for each area, so it is an object of the
present invention to provide an audio reproduction apparatus that facilitates the task of setting
the frequency of the modulated signal to be transmitted.
[0008]
According to another aspect of the present invention, the audio reproduction device is an audio
reproduction device mounted on a vehicle, and includes a plurality of audio acquisition means for
acquiring an audio signal and a plurality of audio signals acquired by the audio acquisition
means. A transmitting means for modulating and transmitting a modulated signal of any one of
the frequencies, a storing means for storing each of a plurality of areas in association with a
frequency already used, and a position detection for detecting the current position Selection
means for acquiring a frequency associated with the area including the detected current position,
and selecting a frequency other than the acquired frequency among the plurality of frequencies
as the frequency of the modulation signal, and transmission means, And transmission control
means for modulating the acquired voice signal into a modulation signal of a selected frequency.
[0009]
According to this aspect, each of the plurality of regions and the already used frequency are
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stored in association, and the frequency associated with the region including the current position
is acquired, and is acquired from among the plurality of frequencies. A frequency other than the
frequency is selected as the frequency of the modulation signal, and the audio signal is
modulated to the modulation signal of the selected frequency.
Therefore, since a frequency other than the frequency already used in the area including the
current position is selected as the frequency of the modulation signal, it is possible to transmit
the modulation signal which does not interfere with the frequency already used. As a result, it is
possible to provide an audio reproduction apparatus capable of transmitting a modulation signal
free from interference.
[0010]
Preferably, the selection means detects the frequency used in the area including the detected
current position and the area around the area, and selects a frequency other than the detected
frequency as the frequency of the modulation signal.
[0011]
According to this aspect, since the frequency used in the area including the detected current
position and the area around the area is detected, it is after moving from the area including the
current position to the surrounding area. Even in this case, interference of the modulation signal
can be avoided.
[0012]
Preferably, the route search means for searching for a route from the detected current position
to the destination, and the selection means have frequencies other than the frequencies already
used in all areas including the route to the searched destination. Of the plurality of frequencies as
the frequency of the modulation signal.
[0013]
According to this aspect, since frequencies other than those already used in all areas including
the route from the current position to the destination are selected as the frequency of the
modulation signal from among a plurality of frequencies, It is not necessary to change the
frequency of the modulation signal while traveling to the destination.
[0014]
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According to still another aspect of the present invention, there is provided an audio
reproduction device mounted on a vehicle, wherein the audio acquisition means acquires an
audio signal, the reception means receives a radio broadcast, and the audio acquired by the audio
acquisition means A transmitting unit that modulates a signal into a modulated signal of any one
of a plurality of frequencies and transmitting the same, and a scanning unit that causes the
receiving unit to receive a radio broadcast and detect the frequency used for the radio broadcast
And selecting means for selecting a frequency other than the frequency detected by the scanning
means among the frequencies in the above, and transmission control means for causing the
transmitting means to modulate the acquired audio signal into a modulation signal of the
selected frequency.
[0015]
According to this aspect, the frequency used for radio broadcasting is detected, a frequency other
than the detected frequency is selected from the plurality of frequencies, and the audio signal is
modulated to the modulation signal of the selected frequency.
Therefore, since a frequency other than the frequency used for radio broadcasting is selected as
the frequency of the modulation signal, it is possible to transmit a modulation signal without
interference.
As a result, it is possible to provide an audio reproduction apparatus capable of transmitting a
modulation signal free from interference.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
In the following description, the same components are denoted by the same reference numerals.
Their names and functions are also the same.
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Therefore, detailed description about them will not be repeated.
[0017]
First Embodiment FIG. 1 is a functional block diagram showing an outline of a hardware
configuration of a navigation device in the present embodiment. Referring to FIG. 1, the
navigation device 10 includes a central processing unit (CPU) 11 for controlling the entire
navigation device 10, a read only memory (ROM) 19 storing a program executed by the CPU 11,
and the like; The RAM (Random Access Memory) 21 used as a work area, the GPS receiver 13,
the TV receiver 14, the liquid crystal display (LCD) 23, the backlight 31, the touch screen 25, the
operation key 27, and , An audio codec 29, an amplifier 33 connected to the audio codec 29, a
speaker 35 connected to the amplifier 33, a video decoder 37, a memory interface (I / F) 15, and
a serial communication I / F 17 Including.
[0018]
The backlight 31 is disposed on the back side of the LCD 23 and emits light toward the LCD 23.
A display such as an organic ELD (Electro Luminescence Display) may be used instead of the LCD
23.
[0019]
The touch screen 25 is made of a transparent member and is provided on the display surface of
the LCD 23. The touch screen 25 detects the position on the display surface of the LCD 23
instructed by the user with a finger or the like, and outputs the position to the CPU 11. The CPU
11 displays various buttons on the LCD 23 to receive various operation instructions in
combination with the instructed position detected by the touch screen. The operation screen
displayed on the LCD 23 by the CPU 11 includes an operation screen for operating the
navigation device 10.
[0020]
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The TV receiver 14 includes a TV tuner, receives a television broadcast signal of a selected
channel, converts the signal into a video signal, and outputs the video signal to the CPU 11. The
CPU 11 outputs the digital video signal input from the TV receiver 14 to the video decoder 37
and the audio codec 29.
[0021]
The video decoder 37 includes a decoding circuit that converts input digital data into an analog
video signal. The video decoder 37 is controlled by the CPU 11 and, when compression-coded
video data is input, converts it into an analog video signal and outputs it to the LCD 23.
[0022]
The audio codec 29 includes a circuit for converting an analog audio signal to digital data and a
circuit for converting digital data to an analog audio signal, and processes audio data. When the
compression encoded digital data is input, the audio codec 29 converts it into an analog audio
signal, and outputs the analog audio signal to the amplifier 33 or the FM transmitter 39. The
amplifier 33 amplifies the audio signal input from the audio codec 29 and outputs the amplified
audio signal to the speaker 35. Thus, the sound is output from the speaker 35.
[0023]
Here, the television broadcast signal received by the TV receiver 14 will be described using the
case of a digital signal as an example, but a broadcast signal of analog television may be received.
In this case, the CPU 11 amplifies the received analog broadcast signal without outputting it to
the video decoder 37 and outputs the amplified signal to the LCD 23.
[0024]
A removable memory card 15A is attached to the memory I / F 15. When the video data
compressed and encoded according to the standard such as MPEG (Moving Picture Experts
Group) is stored in the memory card 15A, for example, the CPU 11 reads the video data and
outputs the video data to the video decoder 37. When sound data compressed and encoded
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according to the standard such as MP3 (MPEG Audio Layer-3) is stored in the memory card 15A,
for example, the CPU 11 reads the sound data and outputs it to the audio codec 29. .
[0025]
The GPS receiver 13 receives radio waves transmitted from GPS satellites in the Global
Positioning System (GPS), and measures the current position on the map. Then, the measured
position is output to the CPU 11. The CPU 11 reads the map data stored in the memory card
15A, and displays on the LCD 23 an image in which the current position inputted from the GPS
receiver 13 is described on the map.
[0026]
The FM transmitter 39 transmits any one modulated signal of a plurality of frequencies from the
antenna. The FM transmitter 39 is controlled by the CPU 11, modulates an audio signal input
from the CPU 11 into a modulation signal of a frequency instructed by the CPU 11, and transmits
the modulated modulation signal from the antenna. Here, the FM transmitter 39 transmits an FM
radio wave from the antenna. Not limited to FM, radio waves of AM may be transmitted, or digital
audio signals may be transmitted.
[0027]
The CPU 11 outputs the audio data decoded and output by the video coder 37 to the FM
transmitter 39. Therefore, the FM transmitter 39 stores the sound data included in the television
signal, the sound data included in the video data compressed and encoded according to the
MPEG standard stored in the memory card 15A, or stored in the memory card 15A. Transmit any
sound data compressed and encoded according to the MP3 standard.
[0028]
FIG. 2 is a flowchart showing an example of the flow of the first frequency setting process. The
first frequency setting process is a process executed by the CPU 11 when the CPU 11 executes a
frequency setting program. Referring to FIG. 2, CPU 11 determines whether an area change
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instruction has been received (step S 01). When the user instructs the touch screen 25 to change
the area in accordance with the area change instruction screen displayed on the LCD 23, the area
change instruction is accepted.
[0029]
FIG. 3 is a view showing an example of a screen displayed on the LCD. FIG. 3A shows an example
of the menu screen. The menu screen includes a button in which the characters "area change" are
displayed for instructing display of the area change instruction screen. If the user points to the
button in which the character "area change" is displayed, the area change instruction screen is
displayed. FIG. 3B is a first diagram showing an example of the area change instruction screen.
The area change instruction screen includes a plurality of buttons representing prefecture names.
[0030]
When the user indicates any of a plurality of buttons, the CPU 11 selects a prefecture
corresponding to the instructed button. Then, if the prefecture set up to that point is different
from the selected prefecture, an area change instruction indicating that the area has been
changed to the selected prefecture is accepted.
[0031]
Here, although the region is a prefecture, it may be a region including a plurality of prefectures.
In this case, in the area change instruction screen, a screen for selecting a region is used. FIG. 3C
is a second diagram showing an example of the area change instruction screen. While the area
change instruction screen shown in FIG. 3 (B) includes a plurality of buttons representing
prefecture names, the area change instruction screen shown in FIG. 3 (C) includes a plurality of
prefectures. Includes multiple buttons with local names including. If the user indicates any of the
plurality of buttons, the CPU 11 selects a region corresponding to the instructed button. Then, if
the previously set region is different from the selected region, the region change instruction
indicating that the region has been changed to the selected region is accepted.
[0032]
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Referring back to FIG. 2, in step S01, the process waits until an area change instruction is
received (NO in step S01), and when the area change instruction is received (NO in step S01), the
process proceeds to step S02. That is, the frequency setting process is a process that is executed
on the condition that an area change instruction is received.
[0033]
In step S02, the frequency table A stored in the ROM 19 is read. The frequency table A is a table
in which the frequencies used by the FM transmitter 39 are associated with each of a plurality of
areas.
[0034]
FIG. 4 is a diagram showing an example of the frequency table A. As shown in FIG. The frequency
table A includes records associating prefecture names, frequencies for television broadcasting
used in the prefectures, and frequencies available to the FM transmitter 39. Referring to FIG. 4,
frequency table A includes items of region, television station name, television reception
frequency, channel number, and FM transmitter frequency. The regional item is set with the
name of prefecture, the item of television broadcast station name is set with the name of
television broadcast station, and the item of television reception frequency is a television to
which the television broadcast station is assigned for use. The frequency for broadcasting is set,
the item of channel number is set the number assigned to the frequency for television
broadcasting, and the item of FM transmitter frequency is set for the frequency that the FM
transmitter 39 can use .
[0035]
The frequency which can be used by the FM transmitter 39 is a frequency other than the
frequency of the FM assigned to each of all the FM broadcast stations existing in the prefecture
of the prefecture name set in the item of the area.
[0036]
Although FIG. 4 shows records of two prefectures, the frequency table A actually includes
records corresponding to all prefectures.
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[0037]
Returning to FIG. 2, in step S03, the read frequency table A is referred to, and the frequency
corresponding to the changed area specified by the area change instruction accepted in step S01
is acquired, and the FM transmitter 39 is obtained. Determine the frequency to be used in
For example, if "ABC" prefecture is specified by the area change instruction, the frequency FC is
determined.
[0038]
In step S04, the channel in which the TV receiver 14 uses a plurality of television frequencies
corresponding to the changed area specified by the area change instruction accepted in step S01
with reference to the read frequency table A. Set to
As a result, the frequency received by the TV receiver 14 is set to the frequency assigned to the
television broadcasting station present in the area.
[0039]
In step S05, the frequency used by the FM transmitter 39 is set to the frequency determined in
step S03. Since the frequency set in step S05 is a frequency other than the frequency assigned to
the FM broadcasting station present in the area specified by the area change instruction accepted
in step S01, the FM radio wave is transmitted by the radio receiver mounted on the vehicle There
is no interference when receiving Therefore, the radio receiver mounted on the vehicle can
receive the modulated signal transmitted by the FM transmitter 39.
[0040]
In step S06, the value of the frequency determined in step S03 is displayed on LCD 23. As a
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result, the user can know the frequency of the radio wave transmitted by the FM transmitter 39,
so that the frequency received by the radio receiver mounted on the vehicle can be set.
[0041]
As described above, in the navigation device 10 according to the first embodiment, the frequency
table A defining the frequency selected from the plurality of frequencies that the FM transmitter
39 can transmit corresponding to each of the plurality of prefectures is It is stored in the ROM
19, and when the user inputs an area change instruction, the FM transmitter 39 is set to the
prefectures included in the area change instruction and the frequency associated with the
frequency table A. The FM transmitter 39 does not transmit a modulation signal of a frequency
that is already in use because the frequency table A defines a frequency that is not already used
among the plurality of frequencies corresponding to each of the plurality of prefectures. For this
reason, radio waves of the FM broadcast station and radio waves transmitted by the FM
transmitter 39 do not interfere with each other. Since the user does not need to know the
frequency being used for each region, it is possible to facilitate the operation of setting the FM
transmitter 39 its dominant frequency.
[0042]
Second Embodiment In the second embodiment, the navigation device 10 stores, for each of a
plurality of areas, a frequency table B in which the frequencies assigned to the FM broadcast
stations existing in that area are associated with the ROM 19. Remember. Hereinafter, differences
from the navigation device 10 in the first embodiment will be mainly described.
[0043]
FIG. 5 is a flowchart showing an example of the flow of the second frequency setting process. The
second frequency setting process is a process executed by the CPU 11 when the CPU 11 executes
a frequency setting program. Referring to FIG. 5, CPU 11 obtains the current position (step S11).
The current position on the map output by the GPS receiver 13 is acquired. Then, it is
determined whether the acquired current position is an area different from the area already set
(step S12). Every time the CPU 11 acquires position information output from the GPS receiver
13, the CPU 11 stores in the RAM 21 which of the prefectures the position specified by the
acquired position information is in. If the name of the prefecture previously stored in RAM 21 is
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different from the prefecture including the position specified by the position information
acquired in step S11, the process proceeds to step S15; otherwise, the process proceeds to step
S13 Advance.
[0044]
In step S13, it is determined whether an area change instruction has been received. When the
user instructs the touch screen 25 to change the area in accordance with the area change
instruction screen displayed on the LCD 23, the area change instruction is accepted. If the region
change instruction has been accepted, the process proceeds to step S15. If not, the process
proceeds to step S14.
[0045]
In step S14, it is determined whether a route search instruction has been accepted. The route
search is a process in which the user receives an operation of specifying an arbitrary position of
the map displayed on the LCD 23 with the touch screen 25, sets the received position as a
destination, and searches for a route from the current position to the destination It is. If the user
inputs an instruction of a destination and an instruction to execute a route search process on
touch screen 25, the route search instruction is accepted and the process proceeds to step S20,
otherwise the process proceeds to step S11 return.
[0046]
That is, in the second frequency setting process, when the vehicle moves to another prefecture,
when the user inputs an area change instruction into the navigation device 10, or when the user
inputs a route search instruction into the navigation device 10 Is executed in any of the cases.
[0047]
When it becomes a prefecture different from the prefecture where the current position is set, or
when the user inputs an area change instruction to the navigation device 10, the frequency table
B stored in the ROM 19 is read in step S15.
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The frequency table B is a table in which, for each of a plurality of areas, the frequency assigned
to each of all the FM broadcast stations existing in the area is associated.
[0048]
6 shows an example of the frequency table B. As shown in FIG. The frequency table includes
records associating prefecture names, frequencies assigned to FM stations present in the
prefecture, and frequencies available to the FM transmitter 39. Referring to FIG. 6, frequency
table B includes the following items: area, FM station name, FM transmission frequency, and FM
frequency without interference. The regional item is set with the name of the prefecture, the item
of the FM broadcast station name is set with the name of the FM broadcast station, and the item
of the FM transmission frequency is for the FM broadcast assigned to be usable by the FM
broadcast station The frequency of no interference is set to a frequency other than the frequency
set to the item of the FM transmission frequency among the plurality of frequencies that the FM
transmitter 39 can transmit.
[0049]
Although FIG. 6 shows records of two prefectures, the frequency table B actually includes records
corresponding to all prefectures.
[0050]
Referring back to FIG. 5, in step S16, the read frequency table B is referred to, and the area
including the position specified by the current position acquired in step S11 or the area change
instruction accepted in step S13 Obtain the changed area to be identified and the frequency used
in the surrounding area adjacent to the area.
For example, if the area including the position identified by the current position acquired in step
S11 or the area after change identified by the area change instruction accepted in step S13 is
Osaka, the area adjacent to Osaka prefecture Prefectures are Kyoto prefecture, Hyogo prefecture,
Wakayama prefecture and Nara prefecture. For this reason, frequencies assigned to each of all
the FM broadcast stations existing in Osaka Prefecture, Kyoto Prefecture, Hyogo Prefecture,
Wakayama Prefecture and Nara Prefecture are acquired from the frequency table B.
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[0051]
In the next step S17, the frequency to be set in the FM transmitter 39 is determined to be a
frequency without interference. Specifically, among the plurality of frequencies that can be
transmitted by the FM transmitter 39, one of the frequencies other than the frequency acquired
in step S16 is determined as the frequency without interference.
[0052]
Then, the frequency used by the FM transmitter 39 is set to the frequency determined in step
S17 (step S18). In the next step S19, the value of the frequency determined in step S18 is
displayed on the LCD 23. As a result, the user can know the frequency of the radio wave
transmitted by the FM transmitter 39, so that the frequency received by the radio receiver
mounted on the vehicle can be set.
[0053]
On the other hand, in step S20, the route from the current position to the destination is searched
in accordance with the route search instruction accepted in step S14. In the next step S21, based
on the route searched in step S20, an area passing from the current position to the destination is
extracted. For example, if the current position is Osaka Prefecture and the destination is
Hiroshima Prefecture, Osaka Prefecture, Hyogo Prefecture, Okayama Prefecture, and Hiroshima
Prefecture are extracted as passage areas passing from the current position to the destination.
[0054]
In the next step S22, the frequency table B stored in the ROM 19 is read out. Then, with
reference to the frequency table B, the frequency used in each passing area passing from the
current position to the destination is acquired based on the route searched in step S20 (step
S23). Here, the frequency that is assigned to each of all the FM broadcast stations existing in
Osaka Prefecture, Hyogo Prefecture, Okayama Prefecture and Hiroshima Prefecture, which are
extracted as the passing area, is acquired from the frequency table B.
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[0055]
Then, in step S24, the frequency to be set to the FM transmitter 39 is determined to be a
frequency without interference. Specifically, from among the plurality of frequencies that can be
transmitted by the FM transmitter 39, one frequency is determined from among the frequencies
other than the frequency acquired in step S23. Then, the frequency used by the FM transmitter
39 is set to the frequency determined in step S24 (step S18), and the value of the frequency
determined in step S24 is displayed on the LCD 23 (step S19).
[0056]
As described above, the navigation device 10 according to the second embodiment stores in the
ROM 19 the frequency table B in which the frequencies already used are associated with each of
the plurality of prefectures, and the current position is The frequency which is already used in
the prefectures including the above is determined, and the frequency other than the frequency
obtained from the plurality of available frequencies is determined as the frequency of the
modulation signal, and the frequency of the FM transmitter 39 is determined. Set to the
determined frequency. For this reason, since a frequency other than the frequency already used
in the area including the current position is selected as the frequency of the modulation signal,
interference with radio waves transmitted by the FM broadcasting station existing in that area
can be prevented. it can.
[0057]
Further, the navigation device 10 refers to the frequency table B to obtain the frequencies
assigned to all the FM stations existing in the prefecture including the current position and the
neighboring prefectures adjacent to the prefecture. Therefore, even after moving from a
prefecture including the current position to a nearby prefecture, it is possible to prevent the
radio wave transmitted by the FM transmitter 39 from interfering with the radio wave
transmitted by the FM broadcasting station. .
[0058]
Furthermore, when the navigation apparatus 10 searches for a route from the current position to
the destination, referring to the frequency table B, the navigation apparatus 10 refers to the
frequency table B, and the FM broadcast stations existing in all prefectures including the route
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from the current position to the destination. The frequency assigned to each is acquired, and the
frequency other than the frequency acquired from among the plurality of frequencies is set in the
FM transmitter 39.
Therefore, it is possible to prevent the radio wave transmitted by the FM transmitter 39 from
interfering with the radio wave transmitted by the FM broadcasting station from the current
position to the arrival at the destination, and the FM transmitter 39 is set. There is no need to
change the
[0059]
Third Embodiment FIG. 7 is a functional block diagram showing an outline of a hardware
configuration of a navigation device in a third embodiment. Referring to FIG. 7, the navigation
apparatus 10A in the third embodiment differs from the first navigation apparatus 10 shown in
FIG. 1 in that a radio receiver 41 is added. The other hardware configuration is the same as that
of the navigation device 10 in the first embodiment, and therefore the description will not be
repeated here.
[0060]
The radio receiver 41 includes a radio tuner, receives a radio broadcast signal of a selected
channel, converts it into an audio signal, and outputs it to the CPU 11. In addition, the radio
receiver 41 can sequentially receive at the receivable frequency, detect the radio wave intensity
of the received radio broadcast signal, and execute a scan operation for detecting the used
frequency, and an instruction from the CPU 11 The scan operation is performed according to and
all of the used frequency and the detected frequency are output to the CPU 11.
[0061]
FIG. 8 is a flowchart showing an example of the flow of the third frequency setting process. The
third frequency setting process is a process executed by the CPU 11 when the CPU 11 executes a
frequency setting program. Referring to FIG. 8, CPU 11 obtains the current position (step S31).
The current position on the map output by the GPS receiver 13 is acquired. Then, it is
determined whether the acquired current position is an area different from the area already set
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(step S32). Every time the CPU 11 acquires position information output from the GPS receiver
13, the CPU 11 stores in the RAM 21 which of the prefectures the position specified by the
acquired position information is in. If the name of the prefecture previously stored in RAM 21 is
different from the prefecture including the position specified by the position information
acquired in step S31, the process proceeds to step S34. If not, the process proceeds to step S33.
Advance.
[0062]
In step S33, it is determined whether an area change instruction has been accepted. When the
user instructs the touch screen 25 to change the area in accordance with the area change
instruction screen displayed on the LCD 23, the area change instruction is accepted. If the region
change instruction is accepted, the process proceeds to step S34, and if not, the process returns
to step S31. That is, the third frequency setting process is performed when the vehicle moves to
another prefecture or when the user inputs an area change instruction to the navigation device
10A.
[0063]
In step S34, a channel scan is performed. Specifically, an instruction to execute a scan operation
is output to the radio receiver 41. Then, the radio receiver 41 executes the scan operation and
obtains the used frequency which is output.
[0064]
Then, in step S36, the frequency to be set to the FM transmitter 39 is determined to be a
frequency without interference. Specifically, from among the plurality of frequencies that the FM
transmitter 39 can transmit, one frequency is determined from among the frequencies other than
the frequency acquired in step S35. Then, the frequency used by the FM transmitter 39 is set to
the frequency determined in step S35 (step S37), and the value of the determined frequency is
displayed on the LCD 23 (step S38).
[0065]
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As described above, in the navigation device 10A according to the third embodiment, the radio
receiver 41 detects the frequency used for radio broadcasting, and the FM transmitter 39 detects
the frequency among the plurality of usable frequencies. A frequency other than the frequency is
selected, and the frequency used by the FM transmitter 39 is set to the selected frequency. For
this reason, since the FM transmitter 39 transmits the modulation signal at a frequency other
than the frequency used for radio broadcasting, the radio wave transmitted by the FM
transmitter 39 is prevented from interfering with the radio wave transmitted by the FM
broadcasting station. Can.
[0066]
In the embodiment described above, the navigation devices 10 and 10A have been described as
an example of the audio reproduction device, but in the case of a device having an audio
reproduction function and an FM transmitter, a disk such as a DVD player It may be a playback
device, a memory player, a mobile phone or the like. Furthermore, it goes without saying that the
invention can be understood as a frequency setting program for causing a computer to execute a
frequency setting method or a frequency setting method for executing the processing shown in
FIG. 2, FIG. 5 and FIG.
[0067]
It should be understood that the embodiments disclosed herein are illustrative and nonrestrictive in every respect. The scope of the present invention is indicated not by the above
description but by the claims, and is intended to include all the modifications within the meaning
and scope equivalent to the claims.
[0068]
<Additional remarks> (1) The device further includes operation receiving means for receiving a
user's operation, and the position detecting means detects the current position in response to the
predetermined operation being received by the operation receiving means. Audio reproduction
apparatus as described. (2) The audio reproduction device according to claim 2 or 3, wherein the
selection means selects the frequency of the modulation signal in response to the predetermined
position being detected by the position detection means. (3) The apparatus further comprises
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operation receiving means for receiving a user's operation, wherein the scanning means detects a
frequency used for radio broadcast in response to reception of a predetermined operation by the
operation receiving means. The audio reproduction device according to 5. (4) The system further
includes position detection means for detecting the current position of the vehicle, and the
scanning means detects a frequency used for radio broadcasting in response to detection of a
predetermined position by the position detection means. The audio reproduction apparatus
according to claim 5.
[0069]
It is a functional block diagram which shows the outline | summary of the hardware constitutions
of the navigation apparatus in this Embodiment. It is a flowchart which shows an example of the
flow of a 1st frequency setting process. It is a figure which shows an example of the screen
displayed on LCD. It is a figure which shows an example of the frequency table A. FIG. It is a flow
chart which shows an example of the flow of the 2nd frequency setting processing. It is a figure
which shows an example of the frequency table B. As shown in FIG. It is a functional block
diagram which shows the outline | summary of the hardware constitutions of the navigation
apparatus in 3rd Embodiment. It is a flow chart which shows an example of the flow of the 3rd
frequency setting processing.
Explanation of sign
[0070]
DESCRIPTION OF SYMBOLS 10 Navigation apparatus, 11 CPU, 13 GPS receiver, 14 TV receiver,
15 memory I / F, 15A memory card, 17 serial communication I / F, 23 LCD, 25 touch screen, 27
operation keys, 29 audio codecs, 31 Backlight, 33 amplifiers, 35 speakers, 37 video decoders, 39
FM transmitters, 41 radio receivers.
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