JPH10335984A - High-frequency receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-frequency receiver which can easily and surely select broadcasting programs BBC, VOA, etc. SOLUTION: A high-frequency receiver is provided with a data table FRQTBL, containing the data about time differentials and the data about the frequencies which can be received in the areas of the time differences of a plurality of frequencies. By referring to the data table FRQTBL by using the time differences at a receiving location, the data about the frequencies which can be received at the receiving location are fetched from the table FRQTBL. The receiver makes a channel selection, based on the fetched data about the frequencies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short-wave receiver for use in various parts of the world.

[0002]

2. Description of the Related Art Short-wave broadcast receivers include BBC and VO.
For a typical short-wave broadcasting station such as A, data of the frequency is prepared in a ROM to facilitate channel selection. That is, for example, when the BBC key is pressed, the ROM
, The data of the BBC frequency is read out, and the reception frequency is set according to this data.
C is to be tuned.

[0003]

However, since short-wave broadcasting generates frequencies that cannot be received depending on the region due to propagation of radio waves, short-wave broadcasting stations such as BBC and VOA broadcast the same content on a plurality of frequencies. ing.

[0004] Therefore, data of a plurality of frequencies is prepared in the above-mentioned ROM for each short-wave broadcasting station, and a user (listener) can select a frequency which can be optimally received in his / her area among the data of the plurality of frequencies. Is to select the data.

[0005] However, data of that frequency is only prepared for each short-wave broadcasting station, for example, in order of frequency, and it is not known until which data the data can be optimally received. For this reason, the user receives all the frequencies in order, and selects a frequency that can be optimally received from among them.

That is, even if frequency data is prepared, its value is reduced to half for the user.

The present invention is to solve such a problem.

[0008]

Therefore, according to the present invention, when the same content is broadcast on a plurality of frequencies, one of the plurality of frequencies is selected to receive the broadcast. At the receiver, the time difference data,
Of the plurality of frequencies, having a data table with data of a frequency that can be received in the area of the time difference, by referring to the data table using the time difference of the receiving location, to receive at the receiving location A short-wave receiver is obtained in which frequency data is extracted from the data table and a channel is selected based on the extracted frequency data. Therefore, even when broadcasting is performed at various frequencies, only frequencies that can be received at the receiving location are to be selected at the time of channel selection.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Considering a short-wave receiver in which the above-mentioned problems are considered, this type of receiver is generally of a synthesizer type, has a built-in clock circuit, and has a receiver. You can display the local time (local standard time) of the area where is used.

Then, from the information on the local time or the time difference, the area where the receiver is used can be known. Also, if the region where the receiver is used is known, the receivable frequency in that region can be known.

The present invention focuses on the above points, and determines the area where the receiver is used from information on the local time, and for a typical shortwave broadcasting station, determines the area based on the determination result. Only frequencies that can be received can be selected.

In the shortwave receiver shown in FIG. 1, BBC, VOA, and Radio Japan can be selected as typical shortwave broadcasts. In the following description, “time difference” means UTC time (Coordinated Universal Time, Greenwich Mean Time)
Time difference with respect to

In FIG. 1, reference numeral 10 denotes a receiving circuit configured in a synthesizer system, and an antenna 11
Signal received from the antenna tuning circuit 1 of the electronic tuning system
2 and the broadcast wave signal SRX of the target frequency fRX
Is taken out.

The signal SRX is transmitted to the high-frequency amplifier 1
3 to the mixer circuit 14 and
From O21, the frequency fLO is, for example, fLO = fRX + fIF [kHz] (1) fIF is an intermediate frequency, and an oscillation signal SLO of, for example, fIF = 450 kHz is taken out. The signal SRX is supplied as a signal, and the signal SRX is frequency-converted into an intermediate frequency signal SIF (intermediate frequency fIF).

Further, the intermediate frequency signal SIF is supplied to an AM detection circuit 16 through an intermediate frequency circuit 15 having an intermediate frequency filter and an amplifier to demodulate an audio signal, and the signal is supplied to a speaker 18 through an amplifier 17. .

Further, the intermediate frequency circuit 15 and the detection circuit 1
6 is connected to the reception level detection circuit 19, and the reception signal S
A detection signal S19 indicating whether the reception level of the RX is equal to or higher than a specified value is extracted.

At this time, the VCO 21 is connected to the circuit 2
Together with 2 to 25, the PLL 20 is configured. That is, the signal SLO from the VCO 21 is supplied to the variable frequency dividing circuit 22 to divide the frequency into 1 / N, and the frequency-divided signal is supplied to the phase comparing circuit 23 and the oscillation circuit 24
An oscillating signal having a reference frequency, for example, a frequency of 5 kHz is taken out from the oscillating circuit. The output voltage of the filter 25 is supplied to the tuning circuit 12 as a tuning voltage.

Therefore, in the steady state, the frequency of the frequency-divided signal from the frequency-dividing circuit 22 and the frequency of the oscillation signal of the oscillation circuit 24 are equal, and the frequency fLO of the oscillation signal SLO at this time is: fLO = N × 5 [KHz] (2), and from equations (1) and (2), fRX = fLO−fIF = N × 5-450 [kHz].

Therefore, if the frequency division ratio N is changed by "1" in the range of 550 to 6090, the local oscillation frequency fLO
However, since the frequency changes between 2750 kHz and 30450 kHz at intervals of 5 kHz, the reception frequency fRX changes in the frequency band of 2300 kHz to 30 000 kHz at a frequency step of 5 kHz and corresponding to the dividing ratio N. Become.

Reference numeral 30 denotes a microcomputer for system control, which is a CPU 3
1. ROM 3 in which various processing routines are written
2, a work area RAM 33 and a memory 34 for storing various data;
Are connected to the CPU 31 through the system bus 39.

In this case, in the ROM 32, for example, a channel selection routine 100 shown in FIG. 2 is prepared as a part of the processing routine. The details of the channel selection routine 100 will be described later, but the channel selection is performed according to the time difference at the receiving location.

Further, in the ROM 32, for example, a time difference table JSATBL and a frequency table shown in FIGS.
FRQTBL is prepared. In this case, the time difference table JSATBL
Is a correspondence table between the data JISA of the time difference and the data CHIMEI of the place name of the representative area corresponding to the time difference. In addition, "Region / city name" written on the right side of table JSATBL
Is shown for reference and is not included in the table JSATBL.

The frequency table FRQTBL is a correspondence table between the time difference data JISA and the data of the frequency of a typical shortwave broadcasting station that can be received in an area corresponding to the time difference. In this example, typical shortwave broadcast stations are BBC,
This is the case where the frequency data is the frequency division ratio N of the variable frequency dividing circuit 22 as well as the case of VOA and radio Japan. The frequency in parentheses indicates the frequency corresponding to the frequency division ratio N for reference, and is not included in the frequency table FRQTBL.

The memory 34 is a ROM capable of electrically erasing and writing data.
Alternatively, although not shown, the battery is a RAM backed up by a battery, that is, the memory 34 is a non-volatile memory, and can hold written data even when the power is turned off. Then, as shown in FIG. 5, for example, the time difference table JSATBL is stored in the memory 34.
Is stored.

Further, referring to FIG.
An input port 36, a clock circuit 37, and a key interface circuit 38 are provided. These circuits 35 to 38 are connected to the CPU 31 through a system bus 39. The port 35 is connected to the frequency divider 22 and the CPU 31
Is set in the frequency dividing circuit 22 through the port 35. Further, the detection signal S from the detection circuit 19
19 is taken into the CPU 31 through the port 36.

The clock circuit 37 measures the current time based on, for example, the UTC time, and the data of the measured UTC time is taken into the CPU 37. Further, the interface circuit 38 includes BBC, VOA,
Radio Japan's tuning keys KBBC, KVOA, and KJPN are connected, and a time setting key KTS and a scan key K
+, K-, and other operation keys K1 to KM are connected.
Each of the keys KBBS to KM is constituted by a non-lock type push switch.

Further, a display controller 41 is connected to the bus 39, and a display memory 42 is connected to the display controller 41.
For example, an LCD 50 is connected as a display element.

Then, the controller 31 is controlled by the CPU 31.
1, the data is written to the memory 42, and the written data is repeatedly read at a predetermined cycle by the controller 41, converted into a display signal, and the display signal is supplied to the LCD 50,
In 0, the time, reception frequency, and the like corresponding to the data written in the memory 42 are digitally displayed. FIG.
2 shows an example of the arrangement of the speakers 18 and the like.

In such a configuration, each process or operation is performed, for example, as follows.

<Setting of Local Time> This is a case where the time displayed on the LCD 50 is set to the local time of the area where the receiver is used. And this setting
When the power switch is off, the operation is performed by pressing the up key K + or the down key K- while pressing the time set key KTS.

That is, each time the key K + or K- is pressed while pressing the time set key KTS, the place name data CHIMEI is read from the time difference table JSATBL in the forward or reverse order, and the read place name is read. Data CHIM
EI is written to the memory 42 through the controller 41. Therefore, the LCD 50 displays the key K + or K
-Each time you press, the place name indicated by the place name data CHIMEI is displayed in the normal or reverse order.

At this time, the time difference data JISA which is paired with the place name data CHIMEI is simultaneously read out from the time difference table JSATBL and written into the memory 34, and also written into the memory 42 through the controller 41. Therefore, for example, as shown in FIG.
Along with the place name, the time difference in the area indicated by the place name is also displayed.

When the place name corresponding to the current receiving place is displayed, the key K + or K- (and the key KT
When the user stops pressing S), the display is fixed, and thereafter, the display of the place name and the time difference at that time is retained. Further, the memory 34 holds the time difference data JISA of the area of the displayed place name.

Then, the current UTC time data is read from the clock circuit 37, and the read UTC time data is corrected to the local time by the time difference data JISA in the memory 34, and the corrected local time is read. Time data is written to the memory 42 through the controller 41.

Therefore, for example, the LCD 50 shown in FIG.
As shown in (1), the current local time at the receiving location is digitally displayed.

By pressing the key K + or K- while pressing the time set key KTS and displaying the target place name on the LCD 50, the time difference in the area of the place name is automatically set, and the local time in the area is set. Is displayed.

<Display of Current Time> This is executed, for example, when the power is turned off. That is, the clock circuit 37 interrupts the CPU 31 every minute. Then, the CPU 31 reads out the data of the UTC time measured by the clock circuit 37 from the clock circuit 37, and the read data of the UTC time is based on the time difference data JISA stored in the memory 34. The data is corrected to the local time data, and the local time data is written to the memory 42 through the controller 41.

Therefore, the LCD 50 has, for example, FIG.
As shown in (1), the place name and the local time in the area of the place name are digitally displayed.

<Tuning by Tuning Key> This corresponds to BBC,
This is a case where one of VOA and radio Japan is selected. In this case, the tuning keys KBBC, KVOA,
Press the tuning key of the short wave broadcast you want to listen to in KJPN. For example, if you want to listen to BBC, press the tuning key KBBC.

Then, the processing of the CPU 31 proceeds to the routine 10
0, step 101, then step 10
In 2, the time difference data JISA is read from the memory 34. In this case, if the receiving location is Central Europe, the time difference is +1 hour, so JISA = + 1 is read.

Subsequently, the process proceeds to step 103. In this case, since the channel selection key KBBC of the BBC is pressed and the time difference data JISA read out in step 102 is +1, the frequency table FRQTBL contains In 4, the data box surrounded by a thick line is selected. That is, generally speaking, in step 103, the frequency table FRQTBL
Among them, the data field corresponding to the pressed tuning key among the tuning keys KBBC to KJPN and the time difference data JISA read out in step 102 is selected.

Thereafter, the process proceeds to step 104, where the frequency table FR
In QTBL, a variable i specifying the frequency division ratio N of the data column selected in step 103 is set to 1.

Subsequently, the process proceeds to step 111. In this step 111, of the data column of the frequency table selected in step 103, the ith division ratio N, in this case, the first division ratio The circumference ratio N (= 741) is read, and then in step 112, step 11
The frequency division ratio N read by 1 is set in the variable frequency dividing circuit 22 through the port 35, and the frequency fRX corresponding to the frequency division ratio N is set as the reception frequency of the reception circuit 10.

Then, in step 113, the detection signal S19 of the detection circuit 19 is checked, whereby
At this reception frequency fRX, it is determined whether a signal can be received.

If the signal cannot be received, the process proceeds from step 113 to step 114. In step 114, the variable i is incremented by 1, and in step 115, whether the variable i has exceeded the maximum value is determined. That is, it is determined whether or not all the division ratios N in the data column selected in step 103 have been used. If all of them have not been used (when the maximum value has not been exceeded), the process proceeds from step 115 to step 111. Return.

Thus, hereafter, steps 111 to 115
Are repeated, and it is sequentially checked whether or not the broadcast can be received for the frequency of the frequency division ratio N in the data column selected in step 103. In this case, it is sequentially checked whether the BBC can be received.

When a broadcast can be received at a certain frequency division ratio N, this is detected in step 113, and the process proceeds from step 113 to step 121. In this step 121, a trigger for executing the routine 100 is obtained. Tuning key which became, in this case, tuning key K
Determines if the BBC is pressed.

When the button is not pressed, the process proceeds from step 121 to step 122. In this step 122, it is determined whether or not, for example, two seconds have elapsed since the process proceeds from step 113 to step 121. If not, the process returns from step 122 to step 121. Therefore,
If the channel selection key that triggered the execution of this routine 100 has not been pressed, steps 121 and 12 are executed.
2 will be repeated.

However, when two seconds have elapsed, this is determined in step 122, the processing proceeds from step 122 to step 123, and this routine 100 is terminated. Therefore, if the channel selection key is not pressed within two seconds after the broadcast is received, the routine 100 is terminated while the received broadcast is being selected. The tuning is decided. In other words, a broadcasting station that can be received in that area, in this case, BBC has been selected.

However, if two seconds of repetition of steps 121 and 122 elapse without the channel selection key being pressed, the process proceeds from step 122 to step 114, and thereafter,
The above processing is performed.

When the tuning key is depressed in this way, a scan is performed for frequencies that can be received at the current receiving location in the frequency table FRQTBL, and tuning is performed.

<Scan Reception over Short Wave Band> This is performed by pressing the up key K + or the down key K-.

That is, when the key K + or K- is pressed while the power is on, the CPU 31 increases or decreases the dividing ratio N of the frequency dividing circuit 22 by "1" in accordance with the key K + or K-. It is decremented.
The result of the increment or decrement is the maximum value 6090 or the minimum value 550 of the frequency division ratio N.
When it is out of the range, it is set to the minimum value or the maximum value.

Therefore, when the key K + or K- is pressed, the reception frequency fRX is incremented or decremented by 5 kHz.

When the reception frequency fRX changes as described above, the detection signal S19 is checked at each step of the reception frequency fRX to check whether or not the broadcast is being received. Is not received, the change of the reception frequency fRX is continued as described above. However, when it is detected that the broadcast is being received at a certain reception frequency fRX, the increment or decrement of the frequency division ratio N is stopped thereafter.

Therefore, the reception frequency fRX changes at intervals of 5 kHz until the broadcast is received, and when the broadcast is received, the reception state of the broadcast is continued thereafter. That is, scan reception is performed.

<Summary> According to the above-described receiver, when a short-wave broadcasting station broadcasts at various frequencies to various parts of the world, only the frequency that can be optimally received at the current location among the frequencies is used. , Tuning key KBBC-KJPN
Is effective, so that a desired short-wave broadcasting station can be easily selected regardless of the receiving location.

Further, since the time difference data is used to determine the receiving location, there is no need to specify the receiving location. In addition, the manufacturer does not need to perform a step of presetting an optimum reception frequency for each destination and a step of managing the destination.

In the above description, the frequency table FRQT
For example, if the BL is prepared in a memory card such as a PC card and is made detachable from the receiver, it is possible to cope with a frequency reorganization or the like.

[0060]

According to the first aspect of the present invention, when a short-wave broadcasting station broadcasts at various frequencies to various parts of the world, the desired short-wave broadcasting station can be received regardless of the receiving location. Can be easily received at the optimum frequency.

According to the second aspect of the present invention, there is no need to specify the receiving location. Also, it is not necessary for the manufacturer to preset the optimum receiving frequency for each destination or to manage the destination.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating one embodiment of the present invention.

FIG. 2 is a flowchart illustrating one embodiment of the present invention.

FIG. 3 is a diagram showing one form of a data table.

FIG. 4 is a diagram showing one form of a data table.

FIG. 5 is a diagram illustrating a storage area.

FIG. 6 is a front view showing one embodiment of the external appearance.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Reception circuit, 14 ... Mixer circuit, 15 ... Intermediate frequency circuit, 16 ... Detection circuit, 18 ... Speaker, 19 ... Reception level detection circuit, 20 ... PLL, 21 ... VCO, 22 ... Variable frequency dividing circuit, 30 ... Micro Computer, 31 CP
U, 32 ROM, 34 memory (for data storage), 3
7 clock circuit 41 display controller 42
... Memory (for display), 50 ... LCD, 100 ... Tuning routine, FRQTBL ... Frequency table, JSATBL ... Time difference table, KBBC, KVOA, KJPN ... Tuning key, KTS, K1-
KM… Operation keys

Claims (2)

[Claims] When the same content is broadcast on a plurality of frequencies, a receiver for selecting one of the plurality of frequencies and receiving the broadcast includes a time difference data, It has a data table with frequency data that can be received in the area of the time difference among the frequencies, and refers to the data table using the time difference in the reception area to obtain the data of the frequency to be received in the reception area. From the data table, and selects a channel based on the data of the extracted frequency. 2. The shortwave receiver according to claim 1, further comprising a second data table, wherein the second data table stores the data of the time difference and the data of a place name of an area having the time difference. When a place name of an area including the receiving place is selected from the second data table, the place name is converted to corresponding time difference data by referring to the second data table. Then, by referring to the data table using the time difference data, frequency data to be received at the receiving location is extracted from the data table, and a channel is selected based on the extracted frequency data. Shortwave receiver.