JP2004364176A - Digital receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a local time corresponding to a time difference without needing a user's correction operation by receiving digital radio broadcasting with at least date and hour information multiplexed. <P>SOLUTION: At least the date and hour information indicating a predetermined standard time is multiplexed in the digital radio broadcasting, and a digital receiver 11 receives the digital broadcasting to obtain the date and hour information. A GPS receiver 12 calculates the location of a moving body such as a vehicle, etc., in accordance with a GPS radio wave and gives the location as location data to the digital receiver. A microcomputer 11d specifies time difference data of a region corresponding to the location data as particular time difference data from time difference data showing time difference between the standard time and the present time of the region in each region, corrects the date and hour information on the basis of the particular time difference data and displays the corrected date and hour information on a display part 11e. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital receiving apparatus for receiving a digital radio broadcast in which additional information including at least date and time information is added to audio information or audio information, and in particular, to a digital receiver capable of displaying a date and time according to the date and time information. It relates to a receiving device.
[0002]
[Prior art]
In general, in digital radio broadcasting, not only audio information such as music or acoustic information (hereinafter simply referred to as audio information) can be transmitted with high quality, but also date / time information and / or text data related to a program. Can be multiplexed with audio information as main information and broadcast. Then, in such a digital receiving apparatus that receives digital radio broadcasts, when digital radio broadcasts are received, additional information including date and time information is displayed on a display unit such as an LCD (liquid crystal display).
[0003]
For example, XM satellite radio broadcasting in the United States, which is one of digital radio broadcasting, provides the above-mentioned date and time information and the like as additional information (data service). Since this digital radio broadcasting is satellite broadcasting, Received nationwide.
[0004]
On the other hand, in XM satellite radio broadcasting, date and time information according to Coordinated Universal Time (Universal Time Coordinated (UTC)) is transmitted as date and time information, but a plurality of standard times (U.S. standard time) are used in the United States. Therefore, the time difference that occurs between the Coordinated Universal Time and the U.S. standard time (that is, local time) at the position (point) where the digital radio broadcast is received differs depending on the position of the digital receiver, and the received date and time information In order to display the local time according to, the user needs to set in advance the time difference between the local time and the time according to the received date information in the digital receiving device. The received time information is corrected according to the time difference to display the local time.
[0005]
The setting of such a time difference occurs not only in the United States but also in regions and countries that adopt a plurality of standard times.
[0006]
As described above, when the user sets the time difference between the UTC and the local time, the user may not know the time difference at the local time. Above is very troublesome. When the time information multiplexed with the audio information is received, the CPU reads the difference time information from the RAM, adds the difference time information to the reception time information, and responds to the addition result in order to eliminate the trouble of setting the time difference. It is known that a local time is displayed on a time display unit.
[0007]
Then, the user operates the jog dial or the like to correct the local time displayed on the time display unit to the local time at which the digital radio broadcast is received. The CPU corrects the difference time information in the RAM in the plus or minus direction according to the amount of correction by the user, and thereafter, the CPU adds the corrected difference time information to the reception time information, and adds the result to the addition result. The corrected local time is displayed on the time display unit based on the corresponding local time information (for example, see Patent Document 1).
[0008]
[Patent Document 1]
JP-A-2002-19688 (paragraphs (0032) to (0044), FIGS. 3 to 5)
[0009]
[Problems to be solved by the invention]
Since the conventional digital receiving apparatus is configured as described above, the reception time information is added to the difference time information, and the local time is displayed on the time display unit according to the addition result, but the user has: It is necessary to correct the local time at which the digital radio broadcast is received by operating a jog dial or the like. In such a case, it is necessary to know in advance the local time difference at which the digital radio broadcast is to be received and to perform a correction operation, so that there is a problem that the user is not troublesome.
[0010]
In addition, when the digital receiving device is mounted on a moving object such as a vehicle or the like, and a situation occurs that frequently passes the time difference boundary line between regions with different time differences, the user may use the jog dial or the like every time. It is necessary to correct the display time by operating, and the correction operation becomes extremely complicated. In some cases, the user forgets to correct the display time, and an incorrect local time is displayed on the display unit. there were.
[0011]
The present invention has been made to solve the above problems, and has as its object to obtain a digital receiving device capable of displaying a local time according to a time difference without requiring a user's correction operation. I do.
[0012]
[Means for Solving the Problems]
A digital receiving device according to the present invention includes a receiving unit that receives a digital broadcast to obtain the date and time information, a position data generating unit that obtains position data by specifying a position of the receiving unit, and the standard time for each region. Date and time correction means for identifying time difference data of a region corresponding to the position data from time difference data indicating a time difference from the current time of the region and correcting and displaying the date and time information based on the time difference data. It is a thing.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1 FIG.
In FIG. 1, a digital receiver 10 is mounted on a mobile object such as a vehicle, for example, and includes a digital receiver 11 for receiving digital radio broadcasts and a GPS receiver (GPS positioning means) 12. The digital receiver 11 includes an antenna 11a, a tuner unit 11b, a signal processing unit (signal processing LSI) 11c, a microcomputer (microcomputer) 11d, a display unit (for example, LCD) 11e, and a D / A converter 11f. I have. A speaker 13 is connected to the D / A converter 11f, and an output of the GPS receiver 12 is input to the microcomputer 11d.
[0014]
In digital radio broadcasting, at least date and time information is multiplexed as additional information on audio information or audio information (hereinafter simply referred to as audio information). For example, in XM satellite radio broadcasting in the United States, Sending time information.
[0015]
The time slot control channel (Time Slot Control Channel (TSCC)) has data and a time domain (Data & Time Field (DTF)) as shown in the figure, and the DTF includes the Christian era (upper: Y-up), the Christian era (Lower: Y-lo), leap year (Leap), month data (Month), day data (Week), day data (Day), time data (Hou), minute data (Min), and second data (Sec) include. Here, it is assumed that UTC (that is, Greenwich Mean Time) is used as the date and time information.
[0016]
A broadcast signal transmitted by digital radio broadcast is received by an antenna 11a, a broadcast signal of a desired frequency is selected by a tuner unit 11b, and is provided to a signal processing LSI 11c as a selected broadcast signal. In the signal processing LSI 11c, after demodulating the selected broadcast signal, decoding is performed to obtain digital audio information. The digital audio information is converted into an analog audio signal by the D / A converter 11f, and is output from the speaker 13 as audio.
[0017]
On the other hand, the additional information including the date and time information is provided to the microcomputer 11d after being decoded by the signal processing LSI 11c. The microcomputer 11d is provided with a memory 14, in which the time difference between the standard time (local standard time) for each region and UTC is stored in advance as time difference data. Then, the microcomputer 11d reads the time difference data according to the position data given from the GPS receiver 12 and corrects the date and time information obtained from the digital radio broadcast with the time difference data as described later, and To be displayed.
[0018]
Next, the operation will be described.
Referring to FIG. 3, it is assumed that a vehicle 21 equipped with the digital receiving device 10 travels in a country having regions R1 to R3. In the illustrated example, it is assumed that the time difference between the area R1 and the UTC is -20 hours, the time difference between the area R2 and the UTC is -19 hours, and the time difference between the area R3 and the UTC is -18 hours. , A time difference boundary 1 is defined, and between the region R2 and the region R3, a time difference boundary 2 is defined. Then, it is assumed that the vehicle 21 has traveled as shown by the solid line in FIG. Note that, in FIG. 3, reference signs A to F indicate the position of the vehicle 21, and reference sign A is located east of reference sign F.
[0019]
Referring to FIG. 4 as well, when the digital receiving apparatus 10 is turned on and the driver (user) tunes the desired digital radio broadcast, the sound (sound) related to the selected digital radio broadcast is transmitted to the speaker 13 as described above. Sent from On the other hand, the GPS receiver 12 receives a radio wave (GPS radio wave) from a GPS satellite (not shown) via the antenna 12a, obtains the position (latitude / longitude) of the vehicle according to the GPS radio wave, and obtains the position data. (Position data acquisition: step ST1).
[0020]
The time difference between the regions R1 to R3 is stored as first to third time difference data in the memory 14 built in the microcomputer 11d, and the time difference boundaries indicating the positions (ie, longitude) of the time difference boundaries 1 and 2 are stored. Line position data is stored. As described above, the microcomputer 11d is provided with date and time information indicating UTC from the signal processing LSI 11c.
[0021]
The microcomputer 11d knows the position (latitude / longitude) of the vehicle 21 according to the position data given from the GPS receiver 12. Next, the microcomputer 11d reads the time difference boundary line position data from the memory 14 and determines whether or not the position of the vehicle 21 is on the west side of the time difference boundary line 1 (step ST2).
[0022]
Now, when the vehicle 21 is located at the position A shown in FIG. 3, the microcomputer 11d determines that the vehicle 21 is located on the east side of the time difference boundary line 1, that is, determines that the vehicle 21 is located in the region R1. The microcomputer 11d reads the first time difference data from the memory 14, corrects the date and time information (UTC data) with the first time difference data, and obtains corrected date and time data (step ST3).
[0023]
In the illustrated example, since the first time difference data is -20 hours, the microcomputer 11d calculates (UTC data-20 hours) to obtain corrected date and time data. Then, the microcomputer 11d displays the corrected date / time data as the current time on the display unit 11e (step ST4).
[0024]
On the other hand, if it is determined in step ST2 that the position of the vehicle 21 is on the west side of the time zone 1, the microcomputer 11d determines whether the position of the vehicle 21 is on the west side of the time zone 2 based on the time zone data. Is determined (step ST5).
[0025]
When the vehicle 21 is located at the position B, C, or E shown in FIG. 3, the microcomputer 11d determines that the vehicle 21 is located on the east side of the time difference boundary line 2, that is, the vehicle 21 is located in the region R2. Then, the microcomputer 11d reads the second time difference data from the memory 14 and corrects the UTC data with the second time difference data to obtain corrected date / time data (step ST6).
[0026]
In the illustrated example, since the second time difference data is -19 hours, the microcomputer 11d calculates (UTC data-19 hours) and obtains corrected date and time data. Then, in step ST4, the microcomputer 11d displays the corrected date and time data on the display unit 11e as the current time.
[0027]
In step ST5, when it is determined that the position of the vehicle 21 is on the west side of the time difference boundary line 2 (that is, when the vehicle 21 is located at the position D or F shown in FIG. 3), the microcomputer 11d determines that the vehicle 21 is located in the region R3. As the position, the third time difference data is read from the memory 14 and the UTC data is corrected with the third time difference data to obtain corrected date and time data (step ST7).
[0028]
In the illustrated example, since the third time difference data is -18 hours, the microcomputer 11d calculates (UTC data -18 hours) and obtains corrected date and time data. Then, in step ST4, the microcomputer 11d displays the corrected date and time data on the display unit 11e as the current time. As is clear from the above description, the tuner unit 11b and the signal processing LSI 11c function as a receiving unit, and the GPS receiver 12 functions as a position data generating unit. Further, the microcomputer 11d functions as a display correction unit.
[0029]
As described above, according to the first embodiment, the time difference data representing the time difference for each area is stored in advance, and the time difference boundary data indicating the position of the time difference boundary is stored in advance, and the GPS receiver receives the time difference data. In accordance with the obtained position data, it is determined which region is currently located, and the date and time information obtained from the digital radio broadcast is corrected and displayed according to the time difference data of the currently located area. Therefore, an effect is obtained that the local time (current time) according to the time difference can be automatically displayed without bothering the user.
[0030]
Embodiment 2 FIG.
5, the same elements as those of the digital receiving apparatus shown in FIG. 1 are denoted by the same reference numerals. In the illustrated example, a mobile object such as a vehicle is provided with a GPS navigation system (GPS navigation means) 31. The GPS navigation system 31 receives a GPS radio wave via an antenna 31a and detects the position ( (Latitude / longitude) to generate position data. Then, the position data is given to the microcomputer 11d of the digital receiver 11.
[0031]
The microcomputer 11d reads the time difference data from the memory 14 according to the position data and corrects the date and time information obtained from the digital radio broadcast based on the time difference data as described with reference to FIG. It will be displayed on the display unit 11e.
[0032]
In the example shown in FIG. 5, since the mobile object is provided with the GPS navigation system 31, it is not necessary to newly attach the GPS receiver 12 to the mobile object as described with reference to FIG. Can be used to correct date and time information obtained from digital radio broadcasting.
[0033]
As described above, according to the second embodiment, the position data of the moving object is obtained using the GPS navigation system provided in the moving object, and the date obtained from the digital radio broadcast is obtained based on the position data. Since the time information is corrected, the local time (current time) corresponding to the time difference can be automatically displayed without installing a new GPS receiver.
[0034]
Embodiment 3 FIG.
In FIG. 6, the digital receiver 40 has a digital receiver 41 for receiving digital radio broadcasts. The digital receiver 41 includes an antenna 41a, a tuner unit 41b, a signal processing unit (signal processing LSI) 41c, It has a computer (microcomputer) 41d, a display unit (for example, LCD) 41e, and a D / A converter 41f. A speaker 42 is connected to the D / A converter 41f.
[0035]
Here, in the digital radio broadcast received by the digital receiving device 40, at least date and time information and transmission position data indicating the transmission position of the digital radio broadcast are multiplexed as additional information with audio information. For example, in DAB (Digital Audio Broadcasting) practically used in Europe, transmission position data indicating a transmission position (transmission position) of a digital radio broadcast is added to audio information as additional information in addition to date and time information. I have.
[0036]
A broadcast signal transmitted by such a digital radio broadcast is received by an antenna 41a, a broadcast signal of a desired frequency is selected by a tuner unit 41b, and given to a signal processing LSI 41c as a selected broadcast signal. The signal processing LSI 41c demodulates the selected broadcast signal and then performs decoding to obtain digital audio information. This digital audio information is converted into an analog audio signal by the D / A converter 41f, and is output from the speaker 42 as audio.
[0037]
On the other hand, the additional information including the date / time information and the transmission position data is decoded by the signal processing LSI 41c, and then is given to the microcomputer 41d. The microcomputer 41d includes a memory 43. As described with reference to FIG. 1, the memory 43 previously stores a time difference between the standard time (local standard time) and UTC for each region as time difference data. .
[0038]
The microcomputer 41d identifies the transmission position of the digital radio broadcast according to the transmission position data. In this case, since the transmission area (service area) of the digital radio broadcast is specified (in other words, if the transmission area of the digital radio broadcast is limited to a specific area), the microcomputer 41d sets the identified transmission position at the identified transmission position. Accordingly, an area where a moving body such as a vehicle is located is specified. The microcomputer 41d searches the memory 43 based on the specified area, reads the time difference data relating to the specified area, corrects the date / time information with the time difference data, and displays the corrected date / time information on the display unit 41e. To be displayed.
[0039]
In this way, when the transmission position data is added to the digital radio broadcast together with the date and time information, the area where the mobile unit is located is specified using the transmission position data, and the time difference associated with the specified area is determined. If the date and time information is corrected using the data, the local time (current time) according to the time difference can be automatically displayed without requiring a positioning device such as a GPS receiver or a GPS navigation system. .
[0040]
In addition, besides the European DAB, for example, a digital radio broadcast whose service area can be identified from an identification code (ID) of a broadcast program, such as RDS (Radio Data System) or RBDS (Radio Broadcasting Data System). For example, the area where the moving object is located can be specified in the same manner.
[0041]
In any case, if information for specifying the transmission position or service area of the digital radio broadcast is added to the digital radio broadcast as additional information in addition to the date and time information, a positioning device such as a GPS receiver or a GPS navigation system The local time (current time) according to the time difference can be automatically displayed without the need for the time difference.
[0042]
As described above, according to the third embodiment, if at least the date and time information and the information indicating the transmission position or service area of the digital broadcast are added as additional information to the audio information in the digital radio broadcast, As a result of specifying the area where is located, and correcting the date and time information according to the time difference data relating to this specific area, the time zone can be adjusted according to the time difference without requiring a positioning device such as a PS receiver or a GPS navigation system. The effect is obtained that the local time (current time) can be automatically displayed.
[0043]
【The invention's effect】
As described above, according to the present invention, a digital broadcast in which date and time information indicating a predetermined standard time is multiplexed is received to obtain date and time information, and a reception position is specified to obtain the position data. From the time difference data indicating the time difference between the standard time and the current time of the region for each region, the time difference data of the region corresponding to the position data is specified as the specific time difference data, and the date and time information is determined based on the specific time difference data. Since the display is corrected and displayed, there is an effect that the local time according to the time difference can be accurately and automatically displayed without requiring a user's correction operation.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a digital receiving device according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a time slot control channel of a digital radio broadcast received by the digital receiving device illustrated in FIG.
FIG. 3 is a diagram illustrating an example of a moving route of a vehicle on which the digital receiving device illustrated in FIG. 1 is mounted.
FIG. 4 is a flowchart illustrating a date and time display operation of the digital receiving device illustrated in FIG. 1;
FIG. 5 is a configuration diagram showing a digital receiving device according to a second embodiment of the present invention.
FIG. 6 is a configuration diagram illustrating a digital receiving device according to a third embodiment of the present invention.
[Explanation of symbols]
10, 40 digital receiver, 11, 41 digital receiver, 11a, 12a, 41a antenna, 11b, 41b tuner section, 11c, 41c signal processing section (signal processing LSI), 11d, 41d microcomputer (microcomputer), 11e, 41e Display unit (LCD), 11f, 41f D / A converter, 12 GPS receiver, 13,42 speaker, 14,43 memory, 21 vehicle, 31GPS navigation system.

Claims (5)

In a digital receiving device that receives a digital broadcast in which date and time information indicating a predetermined standard time is multiplexed and displays a date and time according to the date and time information,
Receiving means for receiving the digital broadcast to obtain the date and time information,
Position data generating means for obtaining position data by specifying the position of the receiving means;
A date to specify the time difference data of the area corresponding to the position data from the time difference data indicating the time difference between the standard time and the current time of the area for each area, and to correct and display the date and time information based on the time difference data and display the date and time. A digital receiving device comprising: a time correction unit. 2. The digital receiving apparatus according to claim 1, wherein the position data generating means is a GPS positioning means for generating position data by receiving a radio wave from a GPS satellite. 2. The digital receiving apparatus according to claim 1, wherein the position data generating means is a GPS navigation means mounted on a moving body for generating position data by receiving a radio wave from a GPS satellite. Transmission position data indicating the transmission position is multiplexed on the digital broadcast,
Receiving means for receiving the digital broadcast and obtaining date and time information and obtaining the transmission position data,
2. The digital receiving device according to claim 1, wherein the position data generating unit specifies an area where the receiving unit is located according to the transmission position data and sets the area as the position data. Area data indicating a service area of the digital broadcast is multiplexed with the digital broadcast,
Receiving means for receiving the digital broadcast to obtain date and time information and obtaining the area data,
2. The digital receiving apparatus according to claim 1, wherein the position data generating unit specifies an area where the receiving unit is located according to the area data and sets the area as the position data.

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