JPH06160551A - Radio receiver - Google Patents

Abstract

PURPOSE:To simply know the local time at each location in the world with a radio receiver. CONSTITUTION:A radio receiver is provided with a memory having the first table FRQMM and the second table DIFMM, a clock circuit 51, a display element 53, and multiple memory keys KM1-KM5. When one key KMi of the memory keys KM1-KM5 is operated in the first mode, data N of the reception frequency f11 are extracted from the area corresponding to the operated key KMi in the table FRQMM, and the reception frequency f11 of a receiving circuit 10 is set. When one key KMi of multiple memory keys KM1-KM5 is operated in the second mode, data of time difference are extracted from the area corresponding to the operated key KMi in the table DIFMM, and the time indicated by the clock circuit 51 is corrected to the local time. The corrected local time is displayed on the display element 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver capable of knowing local time around the world with one touch.

[0002]

2. Description of the Related Art Broadcast schedules for overseas shortwave broadcasts use UTC time (Coordinated Universal Time, Greenwich Mean Time) so that the shortwave broadcasts can be used anywhere in the world.

However, since overseas shortwave broadcasting also broadcasts news of the country where the broadcasting station is located, it is necessary to know the local time (local standard time) of the area where the broadcasting station is located. Further, when receiving a short-wave broadcast, it is necessary to know the local time of the region of the corresponding broadcasting station, because the nature of the radio wave allows good reception of a broadcast from a region sandwiching the region at night. Therefore, when a clock circuit is provided in a receiver for shortwave broadcasting, it is necessary to be able to display not only the local time of the receiving area of the listener but also the local time of the area where the target broadcasting station is located.

For this reason, in a part of a receiver for short-wave broadcasting capable of displaying time, for example, a data table of place name data around the world and time difference data with respect to UTC time is prepared as shown in FIG. When a place name is specified, the time difference data is extracted by referring to the data table by the place name, and the local time of the area of the specified place name is displayed according to the extracted time difference data.

Literature: Japanese Patent Application No. 3-352060, including specifications and drawings

[0006]

However, in conventional receivers, when a place name is designated to display the local time, there is a problem in the method of designating the place name.

That is, in the conventional receivers,
When the up key or the down key is pressed, the place name data is extracted from the data table in the normal or reverse order, and the place name is displayed. Then, when the key operation is stopped when the target place name is displayed, thereafter, the target place name and the local time of the region are displayed.

Alternatively, when the operation mode of the tuning dial is switched and the dial is turned clockwise or counterclockwise, the place name data is similarly extracted in the normal or reverse order and the place name is displayed. When the place name to be displayed is displayed, the dial operation is stopped, and thereafter the target place name and the local time of the region are displayed.

As described above, in the conventional receivers, it is necessary to sequentially display the place names registered in the data table by operating the keys or the dials and select the target place name. Therefore, it takes time and effort to display the desired local time, which is inconvenient. In particular, the larger the number of place names prepared in the data table, the more time-consuming it takes to select the desired place name, and the less convenient it is.

The present invention is intended to solve such a problem.

[0011]

[Means for Solving the Problems] When considering the local time, which listener needs the local time varies depending on the listener. However, the number of local times required by one listener is not so large.

In the present invention, attention is paid to such a point, and for example, five memory keys are provided, and five memory keys are provided.
It will be possible to store data on each place name and its local time. When the memory key is operated, the place name registered in the operated memory key and the local time of the area are displayed. However, if the above is done, the number of operation keys provided on the operation panel of the receiver increases, and operability,
It is not preferable in terms of design and cost. Therefore, in the present invention, the shortwave receiver is generally of a synthesizer type, and attention is paid to the fact that about 5 to 7 memory keys (tuning keys) for receiving frequencies are provided for tuning. The key works as a memory key for the local time.

That is, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the receiving circuit 10 constituted by the synthesizer system, the memory 44, the clock circuit 51, the display element 53, and a plurality of elements are provided. Memory keys KM1 to K
Provide with M5. Then, the memory 44 is the first table
FRQMM and a second table DIFMM are provided. In the first mode, when one memory key KMi of the plurality of memory keys KM1 to KM5 is operated, the first table FRQM
Of the M, the data N of the reception frequency f11 registered here is extracted from the area corresponding to the operated memory key KMi, and the reception frequency f11 of the reception circuit 10 is set by this extracted data N. In the case of the mode of 2, when one memory key KMi of the plurality of memory keys KM1 to KM5 is operated, it is registered here from the area corresponding to the operated memory key KMi of the second table DIFMM. The data of the time difference being taken out is taken out, the time measured by the clock circuit 51 is corrected to the local time by the taken out time difference data, and the corrected local time is displayed on the display element 53. Is.

[0014]

[Operation] When receiving a broadcast, the memory keys KM1 to KM5 function as tuning keys, and when displaying the time, the memory keys KM1
~ KM5 works as a key to display the local time in each region with one touch.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the example shown in FIG. 1, the present invention is applied to a synthesizer type double super-heterodyne receiver, and is a case where tuning is performed by changing the first local oscillation frequency. Further, in this example, the reception frequency f11: 531 kHz to 30 MHz, the first intermediate frequency frequency f13: 55.845 MHz is the second intermediate frequency frequency f15: 455 kHz, and the first local oscillation frequency is changed in steps of 1 kHz. , The reception frequency f11 can be changed in steps of 1 kHz.

That is, in FIG. 1, reference numeral 10 denotes a receiving circuit, and the received signal S11 is supplied from the antenna 11 to the first mixer circuit 13 through the high frequency amplifier 12, and the first local oscillator circuit 21 to the first local oscillator. The signal S21 is supplied to the mixer circuit 13. In this case, the frequency f21 of the local oscillation signal S21 is f21 = f11 + f13 (1) with respect to the reception frequency f11, and f21 = (531 kHz + 55.845 MHz) to (30 MHz + 55.845 MHz) (2) However, the frequency f21 changes like a change in steps of 1 kHz.

Thus, the received signal S11 is transmitted to the mixer circuit 1
3, the frequency is converted into the first intermediate frequency signal S13 (intermediate frequency f13) by the first local oscillation signal S21.

The signal S13 is supplied to the second mixer circuit 15 through the first intermediate frequency amplifier 14, and the second local oscillation circuit 31 outputs the second local oscillation signal S31.
Are supplied to the mixer circuit 15. In this case, the frequency f31 of the local oscillation signal S31 is set to f31 = f13-f15 = 55.39 MHz (3).

Thus, in the mixer circuit 15, the first intermediate frequency signal S13 is secondarily generated by the second local oscillation signal S31.
The frequency is converted into the intermediate frequency signal S15 (intermediate frequency f15). Then, this signal S15 is the second intermediate frequency amplifier 16
Is supplied to the demodulation circuit 17 through the to demodulate the audio signal, and the audio signal is taken out to the terminal 18.

According to the above configuration, the reception frequency f
From the equations (1) and (3), 11 is as follows: f11 = f21−f13 = f21− (f31 + f15) = f21− (55.39 MHz + 455 kHz) = f21−55.845 MHz (4)

Since the frequency f21 changes the range of the equation (2) corresponding to the reception frequency f11, from the equation (4), for example, when f21 = 531 kHz + 55.845 MHz, f11 = f21−55.845 MHz = (531kHz + 55.845MHz) -55.845MHz = 531kHz. When f21 = 30 MHz + 55.845 MHz, f11 = f21−55.845 MHz = (30 MHz + 55.845 MHz) −55.845 MHz = 30 MHz. Therefore, the reception band is 531 kHz to 30 MHz. At this time, the first local oscillation frequency f21 is set to 1 kHz.
If changed in steps, the reception frequency f11 changes in steps of 1 kHz.

Then, the first local oscillation frequency f31 is set to 1 kHz.
The first local oscillation circuit 21 changes to V
This VCO 21 is composed of CO
It constitutes a part of L20.

That is, the oscillation signal of the VCO 21 is supplied to the first mixer circuit 13 as the first local oscillation signal S21, and this signal S21 is supplied to the variable frequency dividing circuit 22 to be divided into a signal having a frequency of 1 / N. The frequency is divided and the divided signal is supplied to the phase comparison circuit 23. In addition, the reference oscillation circuit 24
An oscillating signal S24 having a reference frequency, for example, a frequency of 1 kHz is extracted from the signal source, the signal S24 is supplied to the phase comparison circuit 23, and the comparison output is supplied to the VCO 21 as its control voltage through the low pass filter 25.

Therefore, in the steady state, the frequency-divided signal from the frequency-dividing circuit 22 and the oscillation signal S24 have the same frequency, and the frequency f21 of the oscillation signal S21 at this time is f21 = N × 1 kHz. At this time, the expression (4) is established. Therefore, if the frequency division ratio N is changed by 1 in the range of 56376 to 85845, the local oscillation frequency f21 is within the range of the expression (2).
Since it changes at intervals of kHz, the reception frequency f11 should be 531 kHz.
It can be changed in steps of 1 kHz in the reception band of -30 MHz.

Further, 40 is a microcomputer for system control, 41 is its CPU, 42
Is a ROM in which various programs are written, 43 is a work area RAM, 44 is a data holding memory, and these memories 42 to 44 are connected to the CPU 41 through a system bus 49.

Then, in the ROM 42, for example, routines 100 and 200 of the flowcharts shown in FIGS. 2 to 5 are written. In this case, the routine 100 is the main routine, which realizes the reception process and the time display process according to the user's key operation. Also, routine 200 is an interrupt or main routine 100.
Is a display routine that is called and executed by the routine 200. The routine 200 converts the time measured by the clock circuit 51, which will be described later, into the local time data of the target area and displays the data.

Further, the ROM 42 has a time difference table TMDIF as shown in FIG. 6, for example. This table TMDIF
Is a table of "time difference" with respect to UTC time and "city name (place name)" to which the time difference corresponds, and "city number" is a serial number given to the city name for each equal time difference. Therefore, if you specify the time difference and city number,
The city name can be specified.

Further, the memory 44 stores a city table DIFMM, for example, as shown in FIG. 7, even when the power is off.
Frequency table FRQMM and data area LSTTM, HMTM, LS
TCH is retained. Here, the table DIFMM has first to fifth registration areas corresponding to first to fifth memory keys KM1 to KM5, which will be described later, and each registration area is registered with the memory keys KM1 to KM5. The time difference of the selected area (city) and the city number of the area are held. The city names in the margin are the city names corresponding to the data in each registered area.

The data area LSTTM holds the time difference and the city number of the city when the local time of the city is displayed. For example, when displaying the local time in Tokyo, as shown in the figure, the time difference "+9" in Japan (Tokyo) and the city number "2" in Tokyo are written in the data area LSTTM. In addition, the data area HMTM
Holds data of the time difference (time difference with respect to UTC time) of the local time measured by the clock circuit 51 described later.

Further, the table FRQMM also has first to fifth registration areas corresponding to the first to fifth memory keys KM1 to KM5, and each of the registration areas has a memory key K.
The data of the frequencies registered in M1 to KM5, in this example, the division ratio N is held. Also, the data area LSTCH
Holds the frequency division ratio N corresponding to the frequency f11 that was received when the power was turned off.

The memory 44 is a ROM capable of electrically erasing and writing data in order to hold the data as described above, or a RAM backed up by a battery (not shown). Is
That is, the memory 44 is a non-volatile memory, and can hold the written data even when the power is turned off.

Reference numeral 45 is an output port and 46 is an input port. These ports 45 and 46 are also connected to the bus 49, and the frequency division ratio N is output from the port 45 and set in the frequency dividing circuit 22. Further, a part of the AM demodulation output and the intermediate frequency signal S15 is supplied from the demodulation circuit 17 to the detection circuit 35,
A reception detection signal S35 indicating whether or not the reception circuit 10 has received the broadcast wave signal S11 is taken out, and this detection signal S35 is supplied to the port 46.

Further, 51 is a clock circuit, 52 is a display controller, 53 is an LCD, and 54 is a display RAM.
Then, the circuits 51 and 52 are also connected to the bus 49. In this case, the clock circuit 51 measures the current time in the local time of the area designated by the listener. For example, the listener uses this receiver in Japan and designates Japan (Tokyo). If so, the current time is kept in Japan's local time. The time difference between the local time being clocked by the clock circuit 51 and the UTC time is written in the data area HMTM as described above.

Further, the LCD 53 displays the city name, the current local time of the area, the reception frequency, etc., as shown in FIG.
It is a display memory for the characters displayed in. And
Predetermined data is written in the RAM 54 by the CPU 41, this data is repeatedly read by the controller 52, converted into a display signal, and this display signal is supplied to the LCD 53 to display a predetermined character or the like on the LCD 53. Therefore, the display content of the LCD 53 does not change until the data in the RAM 54 is changed.

Further, 55 is a key interface circuit, through which a time key KTM, an enter key KENT, a scan key KSCN, an up key K +, a down key K-, and memory keys KM1 to KM5 are transferred to a bus 49. Connected. Each of the keys KTM to KM5 is composed of a non-lock type push switch.

Further, 61 is a battery for power supply, and 62 is a power switch. Then, the DC voltage from the battery 61 is supplied to the receiving circuit 10 as its operating voltage through the switch 62, but the microcomputer 40 (including the circuits 51 to 54) is always supplied with the operating voltage without passing through the switch 62. Supplied as. Further, a part of the voltage obtained from the switch 62 is supplied to the port 46 as a signal indicating whether the switch 62 is on or off.

Then, the CPU 41 causes the routine 100,
Various operations are realized by executing 200 as follows.

<< Display of Time (Processing of Display Routine 200) >> When the time is displayed, the display routine 200
Is executed as an interrupt routine or as a subroutine, the process of this routine 200 will be described first.

That is, in the display routine 200, the process of the CPU 41 is step 20 of the routine 200.
Starting from 1, next, in step 202, the time difference data (data of the local time difference measured by the clock circuit 51 with respect to UTC time) written therein is read from the data area HMTM of the memory 44. Then, in the following step 203, the data of the current local time which is being clocked by the clock circuit 51 is taken out. Then, in step 204, the time difference data read in step 202 is subtracted from the local time data of the clock circuit 51 extracted in step 203 to be converted into the current UTC time data.

Then, in step 205, the time difference data of the area where the local time is to be displayed is read from the data area LSTTM of the memory 44, and in the following step 206, the UTC time of the UTC time converted in step 204 is read. The time difference data read in step 205 is added to the data to be converted into the local time data of the area where the time is displayed.

Then, the converted local time data is supplied to the RAM 54 through the controller 52 in step 207. Therefore, the controller 52 causes the LCD 53 to display the current time of the region (city) corresponding to the data written in the data area LSTTM, as shown in FIG. 8A.

Further, in the following step 208, the table TMDIF is referred to by the data written in the data area LSTTM to read the data of the city name corresponding to the table TMDIF, and this data is read by the controller 52 in step 209. Through the RAM 54. Therefore, the controller 52 causes the LCD 53 to
In the data area LSTTM, for example, as shown in FIG.
The city name corresponding to the time difference data written in is displayed. When the local time is displayed by operating the memory keys KM1 to KM5, the number of the operated memory key is also displayed.

Then, the processing of the CPU 41 is step 2
In step 210 following 09, the display routine 20
0 ends.

When the display routine 200 is executed in this manner, each time the display routine 200 is executed,
The local time and the city name of the city corresponding to the data written in the data area LSTTM are displayed on the LCD 53.

<< Operation When Power is Off >> When the power switch 62 is off, various processes relating to time can be performed. That is, as will be apparent from the description below, when the power switch 62 is turned off, the display routine 200 is executed in step 101 of the routine 100,
Therefore, as described above, the local time and the city name of the city corresponding to the data written in the data area LSTTM are displayed on the LCD 53.

Subsequently, in step 102, the interrupt is permitted, and thereafter, the clock circuit 51 interrupts the CPU 41, for example, every 30 seconds, and the routine 200 is executed by this interrupt. Therefore, after that, as described above, the local time and the city name of the city corresponding to the data written in the data area LSTTM are LC
While being displayed on D53, the display is updated, for example, every 30 seconds.

Then, the process proceeds from step 102 to step 111, and this step 111 is entered to wait for key input of any of the keys KTM, KENT, K +, K-, KM1 to KM5 or the power switch 62. Then, when there is a key input, the following processing is executed according to the key input.

<Display of Memory Time> This is a case where the city name of the city registered in the memory key KMi (i = 1 to 5) and its local time are displayed on the LCD 53. That is, when the memory key KMi is pressed in the key input waiting state in step 111, the process proceeds from step 111 to step 112. In step 112, the key input in step 111 is discriminated and the current key is entered. In this case, since the memory key is KMi, the process proceeds from step 112 to step 113.

Then, in this step 113, among the data of the table DIFMM, the pressed memory key KMi
The data written in the i-th area corresponding to is read, and this read data is read in step 1
At 14, the data area LSTTM is newly written and then at step 115, the display routine 200
Is executed, and then the process returns to step 111 to wait for key input.

Therefore, when the memory key KMi is pressed, the city name of the city registered in the key KMi and its local time are displayed on the LCD 53. That is, if you press the memory key KMi, you can press the key K with one touch.
The city name of the city registered in Mi and its local time can be displayed.

<Display of World Time> In this case, the city names and their local times registered in the time difference table TMDIF are sequentially selected and displayed on the LCD 53. That is, if the up key K + or the down key K- is pressed in the key input waiting state in step 111, the process proceeds from step 111 to step 112,
In this step 112, the key input in step 111 is discriminated. In this case, since it is the key K + or K-, the process proceeds from step 112 to step 116.

Then, in this step 116, of the data in the table TMDIF, the next data or the previous data of the data written in the data area LSTTM is read, and this read data is read in step 11
In 4, data area LSTTM is newly written,
Next, in step 115, the display routine 200 is executed, and then the process returns to step 111 to wait for key input.

Therefore, every time the key K + or K- is pressed, the city name and its local time registered in the table TMDIF are selected in the normal order or the reverse order, and the LCD 53 is selected.
Will be displayed in.

The data in the table TMDIF is read cyclically. The last (or first) time difference and the city name data registered in the table TMDIF are followed by the first (or last) time difference and city. It becomes name data.

<Registration in memory key KMi> This is a case where the city name and the time difference data registered in the table TMDIF are registered in the memory key KMi (i = 1 to 5). That is, in step 111, if the user presses any memory key KMi while holding down the enter key KENT while waiting for key input, the process proceeds from step 111 to step 112, and this step 11
In step 2, the key entered in step 111 is discriminated, and in this case, enter key KENT and memory key KMi.
Therefore, the process proceeds from step 112 to step 117.

Then, in this step 117, the data of the time difference and the city number written in the data area LSTTM is written in the i-th area of the table DIFMM corresponding to the pressed memory key KMi, After that, the process returns to step 111 and waits for key input.

Therefore, by selecting an arbitrary city and local time with the up key K + and the down key K- (or the memory key KMi), and then pressing the arbitrary memory key KMi while pressing the enter key KENT, that key is pressed. KMi
The display of the currently selected city and its local time is registered in.

<Time Adjustment> In this case, the time measured by the clock circuit 51 is adjusted to an arbitrary local time.
That is, when the time key KTM is pressed in the key input waiting state in step 111, the process proceeds from step 111 to step 112, and this step 112
At step 111, the key entered in step 111 is determined. In this case, the time key is KTM.
The procedure proceeds from 12 to step 118.

Then, in this step 118,
First, the city selection mode is entered. Therefore, the keys K + and K-
When is operated, the same process as in the case of <display of world time> is executed, and the city name and its local time registered in the time difference table TMDIF are selected in the normal order or the reverse order and displayed on the LCD 53.

When the desired city name is displayed, the time key KTM is pressed again to enter the time setting mode. When the keys K + and K- are operated, the clock circuit 51 clocks as the keys are operated. The current time is advanced or delayed by one minute, for example, and the routine 200 is executed to display the time.

Then, when the correct time is reached, when the time key KTM is pressed again, the clock circuit 51 starts from this point.
Starts timing, which is displayed on the LCD 53.

Thus, when the time key KTM is pressed, the key K
You can use +, K- to select a city registered in the time difference table TMDIF and set it to the local time of the selected city.

<Turning on the power> This is the case where broadcasting is received. That is, in step 111,
When the power switch 62 is turned on while waiting for a key input, the process proceeds from step 111 to step 112.
Then, in step 112, in step 111
The key entered with is identified, and in this case, switch 62
Is turned on, the process proceeds from step 112 to step 121.

Then, thereafter, various operations are realized as a receiver, as described in the following section "Operation when power is on". Further, since the switch 62 is turned on, the voltage of the battery 61 is transmitted through the switch 62 to the receiving circuit 1.
0 as its operating voltage, and the receiving circuit 10 is in the operating state.

<< Operation when Power is ON >> When the power is ON, various operations as a receiver are realized.
By turning on the power switch 62, the CPU 41
Processing proceeds to step 121. Then, in this step 121, the interruption by the clock circuit 51 is prohibited, and therefore, in principle, the time is not displayed thereafter.

Subsequently, at step 122, the frequency division ratio N of the frequency f11 received when the power source was turned off last time is extracted from the data area LSTCH of the memory 44,
This frequency division ratio N is set in the variable frequency dividing circuit 22 through the port 45 in step 123. Therefore,
From this point, the broadcast received when the power was turned off last time is selected.

Subsequently, at step 124, the reception frequency f11 is calculated from the frequency division ratio N obtained at step 122, and the frequency data is calculated by RA through the controller 52.
It is supplied to M54. Therefore, the reception frequency f11 at this time is digitally displayed on the LCD 53, for example, as shown in FIG. 8B.

Then, the process proceeds from step 124 to step 131, and this step 131 is set to wait for key input of any of the keys KENT, KSCN, K +, K-, KM1 to KM5 or the power switch 62. Then, when there is a key input, the following processing is executed according to the key input.

<Reception of Memory Frequency> This is the case of selecting the reception frequency f11 or the broadcasting station registered in the memory key KMi. That is, when the memory key KMi is pressed in the key input waiting state in step 131, the process proceeds from step 131 to step 132. In step 132, the key input in step 131 is discriminated and In this case, since the memory key is KMi, the process proceeds from step 132 to step 133.

Then, in this step 133, of the frequency division ratios N to N of the frequency table FRQMM, the frequency division ratio N written in the i-th area corresponding to the pressed memory key KMi is read out. The read frequency division ratio N is set in the variable frequency division circuit 22 in step 134. Therefore, from this point, the memory key K
Broadcasting stations registered in Mi are selected.

Subsequently, in step 135, the reception frequency f11 is calculated from the frequency division ratio N obtained in step 133, and the frequency data is RA-calculated through the controller 52.
It is supplied to M54. Therefore, the reception frequency f11 at this time is digitally displayed on the LCD 53, for example, as shown in FIG. 8B. Also, the operated memory key KMi
The number of is also displayed.

Then, in step 136, the frequency division ratio N obtained in step 133 is newly written in the data area LSTCH, after which the process returns to step 131 to wait for key input.

Therefore, when the memory key KMi is pressed, the broadcasting station registered in the key KMi is selected.

<Reception by Scan> This is a case where the reception frequency band is scanned from the lowest frequency to receive the broadcast. That is, if the scan key KSCN is pressed in the key input waiting state in step 131, the process proceeds from step 131 to step 132. In step 132, the key input in step 131 is discriminated and If scan key KSC
Since it is N, the process proceeds from step 132 to step 141.

Then, in this step 141, the frequency division ratio N is incremented by "1" from the previous value, and the frequency division ratio N obtained as a result of this increment is set in the frequency division circuit 22 in step 142. It Therefore, from this time point, the frequency f11 corresponding to the frequency division ratio N incremented in step 141 is received.

Then, in step 143, the reception frequency f11 is calculated from the frequency division ratio N incremented in step 141, and the frequency data is calculated by the controller 5
2, the reception frequency f11 at this time is digitally displayed on the LCD 53. And then step 14
4, the detection signal S35 of the detection circuit 35 is checked to see if the signal S11 is received. If not, the process proceeds to step 1
Return to 41. Therefore, steps 141 to 144 are repeated until the broadcast wave signal S11 is received, and the reception frequency f11 increases by 1 kHz. In addition, step 1
In 41, when the frequency division ratio N is incremented and this result exceeds the maximum value of the frequency division ratio N, it is set to the minimum value.

When the broadcast wave signal S11 is received at a certain frequency, this is detected in step 144,
The process proceeds from step 144 to step 136, the scanning is stopped at the reception frequency, the frequency division ratio N of the frequency f11 at this time is newly written in the data area LSTCH, and then the process returns to step 131 and the key is pressed. Wait for input.

Therefore, when the scan key KSCN is pressed, the scan starts from the frequency that has been received until then, and when the broadcast is received, the scan automatically stops at that frequency.

<Reception by manual operation> This is to increase the reception frequency f11 step by step by key operation.
This is when you go down. That is, in step 131, when in the key input waiting state, the up key K +
Or, if the down key K- is pressed, the process proceeds to step 13
From 1 to step 132, the key input in step 131 is discriminated in this step 132. In this case, since it is the key K + or K-, the process proceeds to step 1
The processing proceeds from 32 to step 146.

Then, in this step 146, the frequency division ratio N is incremented or decremented by "1" from the previous value, and the frequency division ratio N of the result of the increment or decrement is the step 1
At 47, it is set in the frequency dividing circuit 22. Therefore, from this time point, the frequency f11 corresponding to the frequency division ratio N incremented or decremented in step 146 is received. In step 146, when the frequency division ratio N resulting from the increment or decrement becomes larger than the maximum value or smaller than the minimum value, it is set to the minimum value or the maximum value.

Subsequently, in step 148, the reception frequency f11 is calculated from the frequency division ratio N incremented or decremented in step 146, the frequency data is supplied to the controller 52, and the LCD 53 receives the reception frequency at this time. f11 is displayed digitally.
Then, in step 136, the frequency division ratio N at this time is newly written in the data area LSTCH, after which the process returns to step 131 to wait for key input.

Therefore, when the up key K + or the down key K- is pressed, the reception frequency f11 is increased or decreased step by step.

<Registration in Memory Key KMi> This is a case where an arbitrary reception frequency is registered in the memory key KMi.
That is, in step 131, if the user presses any memory key KMi while holding down the enter key KENT in the key input waiting state, the process proceeds from step 131 to step 132, and in step 132, the data input in step 131 is input. Key was identified, in this case,
Since the enter key is KENT and the memory key is KMi, the process proceeds from step 132 to step 149.

Then, in this step 149, the current division ratio N is written in the i-th area of the frequency table FRQMM corresponding to the pressed memory key KMi, and then the processing returns to step 131. , Wait for key input.

Therefore, the scan key KSCN, the up key K +, the down key K- (or the memory key KMi) is used to select an arbitrary reception frequency f11, and then the arbitrary memory key KMi is pressed while pressing the enter key KENT. And the reception frequency f currently selected for the key KMi
11 will be registered.

<Confirmation of Time> This is the case of confirming the current time during reception of the broadcast. That is, step 13
When the time key KTM is pressed in the state of waiting for a key input in step 1, the process proceeds from step 131 to step 13
2 proceeds to step 13 in step 132.
The key entered in 1 is identified, and in this case, the time key K
Since it is TM, the process proceeds from step 132 to step 151.

Then, in this step 151, L
The display data of the RAM 54 displayed on the CD 53 is
After being saved in the RAM 43, the display routine 200 is executed in step 152, and then step 153 is repeated while the time key KTM is pressed. Therefore, if you press the time key KTM, step 15
The time when the key KTM is pressed by 2 is displayed on the LCD 53, and the display state at that time is held while the key KTM is pressed.

When the key KTM is released, the process proceeds from step 153 to step 1154. In this step 154, the RAM 15 in step 151
The display data saved in 1 is returned to the RAM 54, and then the process returns to step 131 to wait for key input.

Therefore, during reception of the broadcast, the time key KTM
When the button is pressed, the current time is displayed on the LCD 53 while the button is pressed, and when the button is stopped, the display state such as the original reception frequency f11 is restored.

<Power OFF> This is the case where the reception of the broadcast is stopped. That is, in step 111, when the power switch 62 is turned off in the key input waiting state, the process proceeds from step 131 to step 132, and in step 132, the key input in step 131 is discriminated. In this case, since the switch 62 has been turned off, the process proceeds from step 132 to step 101.

Then, thereafter, various operations relating to time display are realized as described in the section <Operations when power is off>. Further, since the switch 62 is turned off, the operating voltage is not supplied to the receiving circuit 10, and the receiving circuit 10 is in the stopped state.

<< Summary >> As described above, when the power is on, the memory keys KM1 to KM5 operate as reception frequency selection keys, and the frequency registered in the pressed key KMi is selected. can do. However, when the power is off, the memory keys KM1 to KM5 are located in the city (region).
Acts as a selection key for, and among them, the pressed key KMi
The local time of the city registered in can be displayed on the LCD 53. Therefore, the local time in each region can be displayed with a single touch of the memory key KMi, which is convenient.

Moreover, originally, the memory keys KM1 to
Since the KM5 is also used as the city selection key when displaying the local time, the number of keys on the operation panel of the receiver does not increase, which is advantageous in terms of operability, design, cost, and the like. .

In the above description, the clock of the clock circuit 51 is set to UTC time, and this UTC time is set to the city table DIFM.
It is also possible to correct the time difference data of M and display the local time in the corresponding city. Also, in each area of the city table DIFMM, the data of time difference and city number are held,
It is also possible to hold a pointer that specifies the corresponding data of the time difference table TMDIF.

Further, when displaying the local time, it is possible to correct the summer time, and instead of switching the functions of the memory keys KM1 to KM5 by turning the power on / off, a dedicated switching key may be provided. it can.

[0096]

In the first mode, memory keys KM1 to KM1.
M5 operates as a reception frequency selection key, and can select the frequency registered in the pressed key KMi. However, in the second mode, the memory key KM1
KM5 operates as a city (region) selection key, and the local time of the city registered in the pressed key KMi can be displayed on the LCD 53. Therefore, the local time in each region can be displayed with a single touch of the memory key KMi, which is convenient.

Moreover, originally, memory keys KM1 to
Since the KM5 is also used as the city selection key when displaying the local time, the number of keys on the operation panel of the receiver does not increase, which is advantageous in terms of operability, design, cost, and the like. .

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

FIG. 2 is a flowchart showing a part of an example of a processing routine.

FIG. 3 is a flowchart showing an example of a continuation of FIG.

FIG. 4 is a flowchart showing an example of a continuation of FIG.

FIG. 5 is a flowchart showing an example of a time display routine.

FIG. 6 is a diagram showing an example of a data table.

FIG. 7 is a diagram showing an example of a data table.

FIG. 8 is a diagram showing an example of a display state of a display element.

[Explanation of symbols]

 10 receiving circuit 13 1st mixer circuit 14 1st intermediate frequency amplifier 15 2nd mixer circuit 16 2nd intermediate frequency amplifier 17 demodulation circuit 20 PLL 21 VCO 40 microcomputer 41 CPU 42 ROM 44 memory 51 clock circuit 52 display controller 53 LCD 100 Processing routine 200 Display routine

Claims (4)

[Claims] 1. A receiver circuit configured in a synthesizer system, a memory, a clock circuit, a display element, and a plurality of memory keys, wherein the memory includes a first table and a second table. In the first mode, when one memory key of the plurality of memory keys is operated, from the area corresponding to the operated memory key in the first table, The data of the reception frequency registered in is extracted, and the reception frequency of the receiving circuit is set by the extracted data. In the second mode, one of the memory keys is selected. When is operated, the time difference data registered here is extracted from the area corresponding to the operated memory key in the second table, and the extracted time difference is displayed. A radio receiver in which the time measured by the clock circuit is corrected to the local time based on the data, and the corrected local time is displayed on the display element. 2. A receiver circuit configured in a synthesizer system, a memory, a clock circuit, a display element, and a plurality of memory keys, wherein the memory includes a first table and a second table. In the first mode, when one memory key of the plurality of memory keys is operated, from the area corresponding to the operated memory key in the first table, The data of the reception frequency registered in is extracted, and the reception frequency of the receiving circuit is set by the extracted data. In the second mode, one of the memory keys is selected. When is operated, the time difference data and the place name data registered here are retrieved from the area corresponding to the operated memory key in the second table. On the display element by the data of the place name,
The place name is displayed, and the time counted by the clock circuit is corrected to the local time of the region of the place name by the extracted time difference data, and the corrected local time is displayed on the display element. Made radio receiver. 3. A receiver circuit configured in a synthesizer system, a memory, a clock circuit, a display element, and a plurality of memory keys, wherein the memory includes a first table and a second table. When one of the plurality of memory keys is operated when the power is turned on, the area corresponding to the operated memory key in the first table is changed from here. The data of the registered reception frequency is extracted, the reception frequency of the reception circuit is set by the extracted data, and when the power is off, one of the memory keys is selected. When operated, data of the time difference registered here is extracted from the area corresponding to the operated memory key in the second table, and the extracted time difference is stored. A radio receiver in which the time measured by the clock circuit is corrected to the local time based on the data, and the corrected local time is displayed on the display element. 4. A receiving circuit, a memory, a clock circuit, a display device, a plurality of memory keys, a plurality of operation keys, and a plurality of place name data and time difference data in the area, which are configured in a synthesizer system. And a time difference table in which is written, the memory has a first table and a second table, and in the first mode, operates a first key of the plurality of operation keys. Then, the reception frequency of the reception circuit is set to a predetermined frequency, and in this setting state, the second key of the plurality of operation keys and one memory key of the plurality of memory keys are operated simultaneously. Then, in the area of the first table corresponding to the operated memory key, the data of the reception frequency set in the reception circuit is written. When one memory key is operated, the data of the reception frequency registered here is extracted from the area corresponding to the operated memory key in the first table, and the reception data is received by the extracted data. In the case where the circuit reception frequency is set and the second mode is selected, when the first key of the plurality of operation keys is operated, the place name data and the time difference data in the region are displayed from the time difference table. When the place names are sequentially picked up and displayed on the display element, and the second key of the plurality of operation keys and one memory key of the plurality of memory keys are simultaneously operated in this display state, In the area corresponding to the operated memory key in the second table, the time difference data corresponding to the displayed place name and the data of the place name are displayed. Data is written and one memory key of the plurality of memory keys is operated, the time difference data registered here from the area corresponding to the operated memory key in the second table A radio receiver in which the clocked time of the clock circuit is corrected to the local time by the data of the time difference thus taken out, and the corrected local time is displayed on the display element.