JPH10303705A - Synthesizer receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display the name of a broadcasting station at the time of selecting it by comparing data showing a reception frequency with data of the frequencies of respective areas in a data table and copying data of the broadcasting station into a memory. SOLUTION: When an operation key K for presetting is depressed, the frequency band of FM broadcasting is scanned, and a frequency division ratio corresponding to the frequency of received broadcasting and the reception level are written sequentially into the data area of the memory 34 from the largest reception level. The written frequency division ratio is compared with the frequency division ratios of the respective areas in the data table. Data of the broadcasting station name which is prepared for the discriminated area and the frequency division ratio are copied into the data area. When a station selection key Pi is depressed, the frequency division ratio is read from the corresponding data area, is set in a variable frequency-dividing circuit 22 and the broadcasting station is selected. Then, data of the broadcasting station name is read, and the broadcasting station name is displayed on LCD 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthesizer receiver having a preset function.

[0002]

2. Description of the Related Art Generally, a receiver of a synthesizer system using a PLL can preset a broadcasting station to a tuning key, and when the tuning key is pressed, the broadcasting station is preset to the pressed key. A broadcasting station can be selected.

In this case, the preset is to write the data of the reception frequency, for example, the frequency division ratio of the variable frequency dividing circuit of the PLL, to the address of the memory corresponding to the tuning key. Tuning is realized by reading the frequency division ratio from the address corresponding to the depressed tuning key and setting it in the variable frequency dividing circuit. The number of tuning keys is generally about 5 to 9 keys.

[0004]

By the way, as a method of presetting a broadcasting station to a tuning key, a broadcasting frequency band is scanned from the lowest frequency to the highest frequency, and if a broadcast can be received during the scanning, There is a method of writing the division ratio at that time to a memory. And
According to this method, the preset can be easily performed.

However, for example, at a frequency of 76.1 MHz, F
Depending on the channel plan, a plurality of broadcasting stations may be assigned to the same frequency in different regions, such as the M broadcasting stations “FM Iwate” and “Fukui FM”.

[0006] Therefore, since it is not possible to specify a broadcast station from a frequency, a preset wave of a frequency can be set at the time of presetting, but a broadcast station name cannot be preset. As a result, when the tuning key is pressed, the frequency can be displayed together with the tuning, but the station name of the broadcasting station cannot be displayed. In order to display the station name of the broadcasting station by all means, at the time of presetting, it is necessary for the user to manually specify the area of the receiving place.

The present invention is to solve such a problem.

[0008]

Therefore, in the present invention, the frequency conversion of the received signal is performed using the signal formed in the PLL, and the frequency division ratio of the variable frequency dividing circuit of the PLL is changed. Thus, in a synthesizer receiver in which the frequency of the signal is changed to change the reception frequency, a plurality of tuning keys, a data table, and a data area corresponding to each of the plurality of tuning keys are provided. And a display element, and the data table includes, for each divided area, a broadcast that can be received in the divided area when the area where the receiver is used is divided into a plurality of areas. It has station frequency data and station name data of the broadcasting station, and when a preset key is operated, the frequency division ratio of the variable frequency dividing circuit is changed and the broadcast wave band scan is performed. Is performed, and when a broadcast can be received during this scan, data indicating the reception frequency is stored, and the stored data indicating the reception frequency is compared with the data of the frequency of each region in the data table. The corresponding area of the data indicating the stored reception frequency is determined, and among the data for each area in the data table, the data of the broadcast station name prepared in the determined area is stored in the data area. In addition to being copied, data of a frequency for receiving the broadcast station to which the data of the broadcast station name has been copied is prepared in the data area, and when one of the plurality of tuning keys is operated, From the data area corresponding to the operated tuning key in the data area, the data of the frequency prepared in the data area is read. According to the read frequency data, the frequency division ratio of the variable frequency dividing circuit is changed to perform channel selection, and the data area of the memory corresponds to the operated channel selection key. From the data area to be read, the data of the broadcast station name copied to the data area is read, and the name of the selected broadcast station is displayed on the display element by the read broadcast station name data. And a synthesizer receiver. Therefore, when the operation for the preset is performed, the preset of the frequency is executed, and the station name of the corresponding broadcast station is also preset.

[0009]

In FIG. 1, reference numeral 10 denotes an FM receiving circuit configured in a synthesizer system, in which a signal received from an antenna 11 is supplied to an antenna tuning circuit 12 of an electronic tuning system to obtain a target frequency. The broadcast wave signal SRX of fRX is extracted, and this signal SRX is
Through the VCO
21, the frequency fLO is, for example, fLO = fRX−fIF [kHz] (1) fIF is an intermediate frequency, for example, an oscillation signal SLO of fIF = 10.7 MHz is taken out, and this signal SLO is supplied to the mixer circuit 14. The signal SRX is supplied as a local oscillation signal, and is frequency-converted to an intermediate frequency signal SIF (intermediate frequency fIF).

Further, the intermediate frequency signal SIF is supplied to an FM demodulation circuit 16 through an intermediate frequency circuit 15 having an intermediate frequency filter and an amplifier, from which an audio signal is demodulated and taken out. Is supplied to the speaker 18 through the amplifier 17.

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 oscillation signal having a reference frequency, for example, a frequency of 100 kHz is taken out from the VCO 21 through a low-pass filter 25.
Is supplied as the control voltage. Also, 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 × 0.1 [MHz] (2) and from equations (1) and (2), fRX = fLO + fIF = N × 0.1 + 10.7 [MHz] (3)

Therefore, if the frequency division ratio N is changed by 1 between 653 and 793, the local oscillation frequency fLO becomes
Since the frequency changes from 65.3 MHz to 79.3 MHz at intervals of 100 kHz, the reception frequency fRX changes in the frequency band of 76.0 MHz to 90.0 MHz in 100 kHz frequency steps and in accordance with the dividing ratio N. Will be.

Further, the FM receiver is provided with a microcomputer 30 for system control. This microcomputer 30 includes a CPU 31 and
ROM 32 for program and RAM for work area
33 and a memory 34 for holding data. The memories 32 to 34 are connected to the CP through the system bus 39.
Connected to U31.

In this case, the ROM 32 has an automatic preset routine 100 shown in FIGS. 2 and 3, for example.
The details of the routine 100 will be described later.

Further, the ROM 32 has, for example, a data table DTBL as shown in FIG. 4 as a database of station names and frequencies of FM broadcast stations. That is, in the case of the data table DTBL of FIG. 4, the whole of Japan is divided into 14 areas of "Hokkaido", "Tohoku 1", ..., "Kyushu 2". The data table DTBL contains, for each of the divided areas, data KYOKU of the station name of the broadcasting station.
And data of the frequency.

In this case, the broadcast station name data KYOKU is character data indicating the station name of a broadcast station that can practically receive a broadcast in the corresponding area. The frequency data is the data of the frequency fRX used by the broadcasting station indicated by the data KYOKU, and in this example, is the frequency division ratio N when the frequency fRX is received. Note that the division ratio N
Are shown for reference, and are not included in the table DTBL.

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.

The memory 34 includes, for example, FIG.
As shown in FIG.
Station data areas A1 to A7 are prepared. And
In each of the data areas A1 to A7, a division ratio N for a broadcasting station preset in the channel selection key, data KYOKU of the station name of the broadcasting station, and its reception level can be stored. I have.

The bus 39 has ports 35 to 37.
And an interface circuit 38 are connected. Then, the frequency division ratio N is set in the variable frequency dividing circuit 22 from the CPU 31 through the port 35, and channel selection and reception of the receiving circuit 10 are executed.

Further, a part of the intermediate frequency signal is supplied from the intermediate frequency circuit 15 to the detection circuit 51, and a detection signal S51 indicating the level of the reception signal SRX is taken out.
The digital signal S51 is A / D converted by the / D converter 52 and supplied to the port 37. Further, a part of the intermediate frequency signal is supplied from the intermediate frequency circuit 15 to the shaping circuit 53 and is pulsed.
6.

The interface circuit 38 includes various operation keys KA to KM and, for example, seven tuning keys P1.
To P7 are connected. The keys KA to P7 are constituted by non-lock type push switches.

Further, a font ROM (character generator) 41 having font data for converting character data into display data is connected to the bus 39, and a display controller 42 is also connected to the bus 39. A memory 42 for display is connected to the controller 42, and a display element such as L
CD50 is connected.

In this case, the LCD 50 displays characters and the like by a combination of dots.
Is a bit map system corresponding to the dot display system of the LCD 50, and has a capacity for one screen of the LCD 50.
Then, the CPU 31 converts the character data into display data using the font data in the ROM 41, and the display data is written to the memory 43 through the controller 42.

At this time, the display data of the memory 43 is repeatedly read out by the controller 42, converted into a display signal and supplied to the LCD 50,
On the LCD 50, characters corresponding to the character data supplied to the memory 43 are displayed.

In such a configuration, various processes such as presetting are executed by the CPU 31 as follows.

[Preset of Broadcasting Station] This is a case where a broadcasting station is preset to each of the tuning keys P1 to P7. In this case, one of the operation keys KA to KM is pressed. .

Then, the processing of the CPU 31 is changed to the routine 1
00, start from step 101, then step 1
02, the data areas A1 to A7 of the memory 34 are cleared, and thereafter, in step 103, the minimum value 653 as the frequency division ratio N is set in the variable frequency dividing circuit 22 through the port 35, so that the reception frequency fRX becomes the lowest frequency. 76.0 MHz.

Subsequently, in step 111, it is determined whether or not a broadcast is being received by checking the detection signal S51. If a broadcast is not being received, the process proceeds from step 111 to step 112. It is determined whether the frequency dividing ratio N of the variable frequency dividing circuit 22 has reached the maximum value 793. If the maximum value has not been reached, the process proceeds to step 1
From step 12, the process proceeds to step 113. In this step 113, the frequency dividing ratio N of the variable frequency dividing circuit 22 is increased by 1 and the receiving frequency fRX is increased by one step, that is, 100 kHz.
And then the process returns to step 111.

Therefore, according to steps 111 to 113, the FM broadcast frequency band 76.0 MHz to 90.0 MHz
In the step of kHz, scanning is performed from the lowest frequency of 76.0 MHz.

When the detection signal S51 indicates that the reception signal SRX exists at an arbitrary reception frequency fRX, this is detected in step 111, and the processing is performed in step 111.
Then, the process proceeds to step 121. In this step 121, the number of pulses of the signal S52 is counted to determine whether or not the signal is properly synchronized with the broadcast wave signal.

If the signal is not correctly tuned to the broadcast wave signal, the process proceeds from step 121 to step 11
The scanning is continued by proceeding to step 2, but when the synchronization is correctly performed, the processing proceeds from step 121 to step 122.
And in this step 122, the data area A
It is checked whether there is an empty area in 1 to A7.

If there is an empty area in the data areas A1 to A7, the process proceeds from step 122 to step 123, where the division is made to the area having the smallest number among the empty areas in the data areas A1 to A7. Ratio N
And the reception level indicated by the detection signal S51 at that time are written, and then the process proceeds to step 112.

Therefore, according to steps 121 to 123, when a broadcast is received during scanning, the frequency division ratio N corresponding to the frequency of the broadcast and the reception level are sequentially written in the data areas A1 to A7. Will go.

When such writing is repeated and data is written in all of the data areas A1 to A7 and there is no free area, the next time a broadcast can be received, the frequency division ratio N and the reception level of the received signal are reduced. Writing will not be possible.

Therefore, in such a case, it is determined in step 122 that there is no empty area, and the process proceeds from step 122 to step 131. In this step 131, the data in the data areas A1 to A7 is The frequency division ratio N and the reception level are set as a set, and the data are sorted in descending order of the reception level. As a result, the data set with the maximum reception level is arranged in the data area A1, and the data set with the minimum reception level is set in the data area A1.
7 is placed.

Subsequently, the process proceeds to step 132, where the reception level written in the data area A7, that is, the minimum reception level, and the reception of the currently received broadcast indicated by the signal S51 at this time are executed. The level is compared. If the reception level of the currently receiving broadcast is lower than the reception level of the data area A7, the process proceeds from step 132 to step 112, and the currently receiving broadcast station is ignored.

However, if the reception level of the currently receiving broadcast is higher than the reception level of the data area A7 at step 132, the process proceeds from step 132 to step 133. , The frequency division ratio N and the reception level are written in the data area A7, and then the process proceeds to step 112.

Since the processing of steps 131 to 133 is executed every time a broadcast is received until the scanning is completed, the data in the data areas A1 to A7 is data of the upper seven stations having a high reception level.

Thus, the highest frequency of the FM broadcast wave band 90.0
When the scan proceeds to MHz, this is determined in step 112, and the processing is performed from step 112 to step 14.
1 and in a step 141, the data area A1
Is written in the data table DTBL.
Is compared with the frequency division ratio N of each area, and the data areas A1 to A
It is determined which area of the data table DTBL the area corresponding to the dividing ratio N written in 7 is.

Next, in step 142, of the data table DTBL, the broadcast station name data KYOK prepared in the area determined in step 141 is determined.
The U and the frequency division ratio N are copied to the data areas A1 to A7, and then the routine 100 is terminated by step 143.

Therefore, according to steps 141 to 142, the area where the receiver is used is determined using the frequency division ratio N obtained in steps 101 to 103, and the broadcast station that can receive in the determined area is used. Are preset in the tuning keys K1 to K7.

[Selection of preset broadcast station] This is achieved by selecting preset keys P1 to P7 by [preset of broadcast station].
This is a case where a preset broadcasting station is selected.
In this case, among the tuning keys P1 to P7, the preset tuning key Pi of the target broadcasting station is set.
(I = 1 to 7; the same applies hereinafter).

Then, of the data areas A1 to A7,
The division ratio N written here is read from the data area Ai corresponding to the tuning key Pi, and the read division ratio N is set in the variable frequency dividing circuit 22. Therefore, the broadcasting station preset in the tuning key Pi is selected.

At this time, the data areas A1 to A7
The data KYOKU of the broadcast station name written here is read from the area Ai corresponding to the tuning key Pi, and the read data KYOKU is converted into display data by the data in the ROM 41. Controller 42
, And the broadcast station name at this time is displayed on the LCD 50.

Further, the frequency dividing ratio N read from the data area Ai is converted into data indicating the reception frequency fRX by the equation (3), and is also converted into display data and supplied to the controller 42. Receive frequency fRX
Is digitally displayed on the LCD 50.

Therefore, when the tuning key Pi is depressed, the broadcasting station preset in the tuning key Pi can be selected. The LCD 50 displays the station name and frequency of the selected broadcasting station.

[Summary] As described above, according to the above-described receiver, the broadcast station name can be automatically preset at the time of presetting without the user manually specifying the area of the receiving place. , This also allows you to select
The name of the broadcasting station can be displayed.

[Others] In step 142, only the data KYOKU indicating the name of the broadcasting station is stored in the data table.
Data can be copied from the DTBL to the corresponding areas of the data areas A1 to A7. Steps 123 and 133
, The data can be written to the RAM 33, and the result can be used to perform the processing of step 141. Further, in the above description, the same configuration can be applied to the case where the receiving circuit 10 receives an AM broadcast or a television broadcast.

[0050]

According to the present invention, the name of the broadcasting station can be displayed, and the name of the broadcasting station being listened to can be known. In addition, there is no need to manually select an area where the receiver is used, for example.

[Brief description of the drawings]

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

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

FIG. 3 is a flow chart showing a continuation of FIG. 2;

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

FIG. 5 is a diagram showing one form of memory contents.

[Description of Signs] 10 ... Reception circuit, 14 ... Mixer circuit, 15 ... Intermediate frequency circuit, 16 ... FM demodulation circuit, 20 ... PLL, 21 ... VC
O, 22: variable frequency dividing circuit, 30: microcomputer, 31: CPU, 32: ROM (for programs and databases), 34: memory (for holding data), 41
... Font ROM, 42 ... Display controller,
43: memory (for display), 50: LCD, 10
0: Automatic preset routine, KA to KM: Operation keys,
P1-P7… Tuning key

Claims (1)

[Claims] A frequency conversion of a reception signal is performed by using a signal formed in a PLL, and a frequency of the signal is changed by changing a frequency division ratio of a variable frequency divider circuit of the PLL. A synthesizer-type receiver configured to change a frequency, comprising: a plurality of tuning keys; a data table; a memory having a data area corresponding to each of the plurality of tuning keys; and a display element; When the area where the receiver is used is divided into a plurality of areas, the data table shows, for each of the divided areas, the data of the frequency of the broadcast station that can be received in the divided area and the station of the broadcast station. When a preset key operation is performed, the frequency division ratio of the variable frequency divider circuit is changed, and the broadcast wave band is scanned. Is received, data indicating the reception frequency is stored, and the data indicating the stored reception frequency is compared with the data of the frequency of each region in the data table, and the data indicating the stored reception frequency is stored. The corresponding area is determined, and among the data for each area in the data table, the data of the broadcasting station name prepared in the determined area is copied to the data area, and the data of the broadcasting station name is copied. Frequency data for receiving the broadcast station to which the data has been copied is prepared in the data area, and when one of the plurality of tuning keys is operated, the operated selection is performed in the data area of the memory. From the data area corresponding to the station key, data of the frequency prepared in the data area is read, and the data of the read frequency is read. The frequency division ratio of the variable frequency dividing circuit is changed according to the data and the tuning is performed, and from the data area of the memory, the data area corresponding to the operated tuning key is copied to the data area. A synthesizer receiver in which data of the selected broadcasting station name is read, and the name of the selected broadcasting station is displayed on the display element by the read data of the broadcasting station name.