JPH07336194A - Radio receiver - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a receiver that can easily cope with a change in broadcast frequency due to the season or the like. [Structure] Received signal S by output signal SLO of PLL 20
Performs RX frequency conversion. By changing the frequency division ratio N of the variable frequency dividing circuit 22 in the PLL 20, the reception frequency f
Change RX. A demodulation circuit 51 and a memory 34 are provided. The signal SDT having frequency data is supplied to the demodulation circuit 51, and the frequency data is demodulated and taken out from the demodulation circuit 51. The extracted frequency data is written in the memory 34. At the time of tuning, the frequency division ratio N is determined from the frequency data written in the memory 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a synthesizer type radio receiver.

[0002]

2. Description of the Related Art In shortwave broadcasting, the reception state changes depending on the season and time, so that well-known broadcasting stations such as VOA and BBC broadcast the same program on a plurality of different frequencies.

Therefore, a method has been considered in which a frequency table FRQT as shown in FIG. 2 is prepared in the memory and the optimum frequency is selected by referring to the frequency table FRQT.

That is, the frequency table FRQT is divided into ten pages P01 to P10 as a whole, and each of the pages P01 to P10 has addresses A1 to 5 for five stations.
It is divided into A5. Frequency data for receiving the broadcast of each frequency is registered in the addresses A1 to A5 of each page P01 to P10.

In the example of FIG. 2, the frequency division ratio N of the PLL forming the local oscillation signal is registered as the frequency data, and the frequency division ratios N11 to N11 for five stations are registered on the first page. N15, frequency division ratios N21 to N23 for 3 stations on the 2nd page,
The frequency division ratios N31 to N32 for two stations are registered on the third page, respectively. It should be noted that N = 0 indicates unregistered. Further, in FIG. 2, the frequency fRX and the broadcasting station name are not included in the frequency table FRQT, but are shown for reference as the reception frequency and the broadcasting station name corresponding to the frequency division ratio N.

Therefore, if page Pi and address Aj are designated for this frequency table FRQT (i = 01,
Any of ~ 10. j = 1 to 5), and any of the frequency division ratios N to N registered in the frequency table FRQT can be designated.

Therefore, a page up key K +, a page down key K-, and tuning keys K1 to K5 are provided. When the page key K + or K- is pressed, the frequency table FRQT is selected one page at a time in the forward order or the reverse order each time the button is pressed, and when the tuning key Kj is pressed, among the selected pages Pi. , The frequency division ratio Nij registered at the address Aj is extracted from the address Aj corresponding to the pressed tuning key Kj, and the frequency division ratio N thus extracted is extracted.
ij is supplied to the PLL to set the local oscillation frequency,
A frequency corresponding to the frequency division ratio Nij is selected.

In this way, for the 50 kinds of frequencies, the number of keys required for tuning is seven keys of page keys K +, K- and tuning keys K1 to K5. The operation surface of is not full of keys.

[0009]

By the way, in short-wave broadcasting, the propagation state of radio waves changes depending on the season, so that some frequencies are generally changed in spring and autumn. Therefore, the user (listener) needs to rewrite the frequency data (frequency division ratio N) of the frequency table FRQT every time the frequency is changed, but it is troublesome to perform such rewriting twice a year. Trouble is likely to occur.

Therefore, for example, the frequency data for spring and summer may be registered on the first page, the frequency data for autumn and winter of the same broadcasting station may be registered on the second page, and these may be selectively used depending on the season. However, this causes the frequency table FRQT to become substantially narrower.

The present invention is intended to solve the above problems.

[0012]

Therefore, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the frequency conversion of the reception signal SRX is performed by the output signal SLO of the PLL 20, and the variable signal in the PLL 20 is changed. A synthesizer type radio receiver in which the reception frequency fRX is changed by changing the division ratio N of the division circuit 22 has a demodulation circuit 51 and a memory 34,
The signal SDT having frequency data is supplied to the demodulation circuit 51, the frequency data is demodulated and extracted from the demodulation circuit 51, and the extracted frequency data is stored in the memory 3.
The frequency division ratio N is determined from the frequency data written in the memory 34 when the channel is selected.

[0013]

When the frequency data is transmitted from the telephone line, the frequency data in the frequency table is updated with the transmitted frequency data.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 denotes a receiving circuit constructed in a synthesizer system, in which a received signal from an antenna 11 is supplied to an antenna tuning circuit 12 of an electronic tuning system to obtain a broadcast wave signal of a target frequency fRX. SRX is taken out.

This signal SRX is the high frequency amplifier 1
3 to the mixer circuit 14 and VC
The frequency fLO is, for example, fLO = fRX + fIF [kHz] ... The signal SRX is frequency-converted into an intermediate frequency signal SIF (intermediate frequency fIF).

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

At this time, the VCO 21 has the circuit 2
The PLL 20 is configured with 2 to 25. That is, the signal SLO from the VCO 21 is supplied to the variable frequency dividing circuit 22 and divided into a frequency of 1 / N. This frequency divided signal is supplied to the phase comparison 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 rectifying circuit. Further, 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-divided signal from the frequency-dividing circuit 22 and the oscillating signal of the oscillating circuit 24 have the same frequency. Therefore, the frequency fLO of the oscillating signal SLO at this time is fLO = N × 5 [KHz] (2), and from the expressions (1) and (2), fRX = fLO-fIF = N × 5-450 [kHz].

Therefore, if the frequency division ratio N is changed by "1" between 550 and 6090, the local oscillation frequency fLO
However, since the frequency changes from 2750 kHz to 30450 kHz with a frequency interval of 5 kHz, the reception frequency fRX is 2300 kHz to 30000 kHz.
z frequency band with frequency interval of 5 kHz and frequency division ratio N
Will change according to.

Further, 30 is a microcomputer for system control, 31 is its CPU, 32
Is a ROM in which various processing routines are written, 33
Is a work area RAM, 34 is a memory for storing various data, and these memories 32 to 34 are connected to the CPU 31 through a system bus 39.

In this case, the memory 34 is a ROM capable of electrically erasing and writing data, or a RAM backed up by a battery (not shown), that is, the memory 34 is non-volatile. It is used as a memory so that the written data can be retained even when the power is turned off.

Then, the frequency table FRQT shown in FIG. 2, for example, is prepared in the memory 34. The structure and contents of this table FRQT are as described above,
10 pages x 5 stations, pages P01 to P10 and address A
1 to A5, and at its address Aj, character data indicating the station name of the broadcasting station and a frequency division ratio N for selecting the broadcasting station.
And are registered.

Further, in FIG. 1, 35 is an output port, 36 is an input port, 37 is a key interface circuit, and these circuits 35 to 37 are connected to the CPU 31 through a system bus 39. Then, the port 35 is connected to the frequency dividing circuit 22, and the frequency dividing ratio N from the CPU 31 is set in the frequency dividing circuit 22 through the port 35.

The port 36 also has an FSK demodulation circuit 5
1 is connected, and the demodulation circuit 51 is connected to the input connector 52. Further, the key interface circuit 37 includes various keys K +, K-, K0 to K9, KEX.
E and KFNC are connected. These keys K + to KFNC
Are all composed of non-lock type push switches.

As described above, the keys K + and K- are the page up key and the page down key for selecting the pages P01 to P10 of the frequency table FRQT. Further, the keys K1 to K5 among the keys K0 to K9 are not only the tuning keys for selecting the selected page Pi, but also the numeric keys "1" to "5".

Further, the keys K0 and K6 to K9 are "0",
The numeral keys "6" to "0", the key KEXE is an execution key, and the key KFNC is a function key. Every time the key is pressed, some of the functions of the keys K + to K0 are switched. The tuning keys (numerical keys) K1 to K5 correspond to the addresses A1 to A5 of the frequency table FRQT, as shown in FIG.

Further, a display, which is a LCD 40 in this example, is connected to the system bus 39 through a display controller 44.

FIG. 3 shows an example of the display surface of the LCD 40, which is formed in a horizontally long rectangle as a whole, and has a wide display area 49 at the upper part and five display areas horizontally arranged at the lower part. 41 to 45. And
Areas 41 to 45 include page P of the frequency table FRQT.
Of 01 to P10, the station names of the broadcasting stations registered in the addresses A1 to A5 of the page Pi selected by the page keys K + and K- are displayed, respectively, and the area 49 displays the frequency fRX currently being received. And the name of the broadcasting station is displayed. In FIG. 3, the second page P02 of the frequency table FRQT is selected and the frequency 976 of the address A2 is selected.
This is the case when 0 kHz is selected. Further, as shown in FIG. 3, under the areas 41 to 45, the tuning keys K1 to
K5 is placed respectively.

Also, 6 is a telephone line, 7 is a line adapter,
Reference numeral 8 denotes a telephone, which are not included in this receiver, the adapter 7 is connected to the connector 52 when updating data, and the line 6 and the telephone 8 are connected to the adapter 7.

FIG. 4 shows an example of the data format of the signal SDT supplied to the input connector 52. That is,
This signal SDT has a header at the beginning, a plurality of words following it, and an end code at the end. Each word constitutes data for one station, and each word comprises a start bit, main data, and a stop bit.

The main data is composed of character data indicating the station name of the broadcasting station and a frequency division ratio N for selecting the broadcasting station. Then, this signal SDT is an FS in the audible band due to the binary signal having such a data structure.
The modulated signal is K-modulated or PSK-modulated. The signal SDT is transmitted from the service center or the like through the telephone line 6 as in the facsimile information service.

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

<Update of Broadcasting Station Data> This is a case of updating the station name data and frequency data of the broadcasting station.

That is, in this case, the function key KFNC is pressed several times to set the mode to the update mode of the broadcasting station data, and then the execution key KEXE is pressed while pressing the "0" key K0 to update the frequency table FRQT. To Next, make a call from the telephone 8 to the service center,
Operate the dial keys of the telephone 8 in accordance with the instruction of Anaus, and finally execute key K in accordance with the instruction of Anaus.
Press EXE to hook the phone 8 on hook. Then, the signal SDT is transmitted from the service center through the telephone line 6.

The signal SDT is demodulated by the demodulation circuit 51 through the signal line of line 6 → adapter 7 → connector 52.
Is demodulated to the original binary signal, and the demodulated binary signal is taken into the microcomputer 30 through the port 36 and sequentially written in the frequency table FRQT of the memory 34.

When the data transmission from the service center is completed, this is discriminated by the completion code, and the receiver automatically returns to the reception mode.

Thus, when a telephone call is made to a service center or the like, the signal S transmitted from the service center is sent.
The data of the frequency table FRQT of the memory 34 is updated by the DT.

<Page feed> This page feed is realized by pressing the page up key K + or the page down key K-.

That is, when the receiver is in the reception mode and the key K + or K- is pressed, the page pointer PGPT designating the page of the frequency table FRQT is incremented or decremented by "1". At this time, the pointer PGPT has the maximum value “10” or the minimum value “1”.
When it is out of the range, PGPT = 1 or PGPT = 10 is set.

Subsequently, in the frequency table FRQT, character data of all broadcasting station names registered in the page Pi indicated by the page pointer PGPT is read out and supplied to the controller 38. Therefore, the controller 38 displays the station names of all the broadcasting stations registered in the selected page Pi in the areas 41 to 45 of the LCD 40.

Therefore, by using the page up key K + or the page down key K-, it is possible to select the registered page of the target broadcasting station while checking the LCD 40.

<Tuning with tuning keys K1 to K5>
This is a case where channel selection is performed using the page keys K +, K- and channel selection keys K1 to K5.

In this case, first, the page name of the target broadcast station is displayed in any of the areas 41 to 45 of the LCD 40 by the above-mentioned <page feed>, and then the target station name is displayed. Press the tuning key Kj located below the displayed area.

Then, in the frequency table FRQT, the pressed tuning key Kj of the page indicated by the page pointer PGPT.
The frequency division ratio N registered at the address Aj is read from the address Aj corresponding to. Then, the read frequency division ratio N is set in the variable frequency division circuit 22 through the port 35. Therefore, from this time point, the reception state of the frequency fRX corresponding to the frequency division ratio N is entered.

Subsequently, the character data of the broadcasting station name registered at the address Aj is read from the same address Aj, and the read character data is read by the controller 3
8, the controller 38 displays the station name of the selected broadcasting station in the area 49 of the LCD 40 as shown in FIG. In addition, the division ratio N at this time
Is converted into display data indicating the reception frequency fRX and supplied to the controller 38, and is displayed in the area 49 of the LCD 40.
The reception frequency fRX is also digitally displayed.

In this manner, the page stations K +, K- and the tuning keys K1 to K5 can select the broadcasting stations registered in the frequency table FRQT.

<Tuning with the numeric keys K0 to K9>
This is a case where the reception frequency fRX is directly input by using the numeric keys K0 to K9 to select an arbitrary frequency.

That is, in this case, the number of the frequency desired to be received is input from the number keys K0 to K9, and then,
Press the execute key KEXE. For example, if you want to receive the frequency "21460 kHz", use the number keys K0 to K9 to select "2, 1,
Input "4, 6, 0" in order, and finally press the execution key KEXE.

Then, the input numerical value indicating the frequency is converted into the frequency dividing ratio N, the frequency dividing ratio N is set in the frequency dividing circuit 22, and the display data indicating the received frequency fRX is sent to the controller 38. The received frequency fRX is supplied and digitally displayed in the area 49.

Therefore, by using the numeric keys K0 to K9, it is possible to directly specify and receive any reception frequency fRX.

<Other Example> In the above description, when the data of the frequency table FRQT is updated, the line adapter 7 is externally attached to the connector 52. However, the line adapter 7 is built in the receiver. When updating data, the line 6 and the telephone 8 can be connected.

Alternatively, not the telephone line 6 but the signal SDT
It is possible to update the contents of the frequency table FRQT by reproducing the recorded cassette tape or the like and supplying the reproduced signal SDT to the connector 52.

Further, the signal S supplied to the connector 52
You can also change the DT format and data content. Further, by using the demodulation circuit 51 as a modem,
The data of the frequency table FRQT can be saved / recovered with respect to the cassette tape or the like connected to the connector 52. Further, the numeric keys K0 to K9 and the speaker 18
If is made to function as a dial key and a handset, the telephone 8 need not be connected.

Further, not only the frequency table FRQT but also the program for performing the reception processing can be updated in the same manner. In that case, the processing of the key input from the keys K + to KFNC and the data from the demodulation circuit 51 are performed. Input processing, LCD40
The BIOS for performing the display processing and the like may be prepared in the ROM 32, and the updated program may be prepared in the memory 34.

[0055]

According to the present invention, since the data of the frequency table can be updated through a telephone line or the like, even when the frequency changes depending on the season.
You can easily adapt to new frequencies. Moreover, the frequency table can be fully utilized.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an example of a data table.

FIG. 3 is a diagram showing an example of a display state of reception frequencies.

FIG. 4 is a diagram showing an example of a signal format.

[Explanation of symbols]

 10 reception circuit 12 antenna tuning circuit 14 mixer circuit 16 AM detection circuit 20 PLL 21 VCO 22 variable frequency divider circuit 30 microcomputer 31 CPU 34 memory 40 LCD 51 FSK demodulation circuit FRQT frequency table K + to KFNC operation key

Claims (5)

[Claims] 1. A radio receiver of a synthesizer system, wherein the frequency of a received signal is converted by an output signal of the PLL and the received frequency is changed by changing a frequency division ratio of a variable frequency dividing circuit in the PLL. A demodulation circuit and a memory, a signal having frequency data is supplied to the demodulation circuit, the frequency data is demodulated and extracted from the demodulation circuit, and the extracted frequency data is stored in the memory. A radio receiver in which the frequency division ratio is determined from the frequency data written in this memory when written and selected. 2. The radio receiver according to claim 1, further comprising an external terminal, wherein the frequency data is supplied to the demodulation circuit through the external terminal. 3. The radio receiver according to claim 1, wherein the signal having the frequency data is supplied through a telephone line. 4. The radio receiver according to claim 1, claim 2 or claim 3, wherein the signal having a frequency data is a data of a station name of a broadcasting station corresponding to the frequency data. A radio receiver having the station name data of the broadcasting station written in the memory, and the station name is displayed on the display by the station name data. 5. The radio receiver according to claim 1, claim 2, claim 3, or claim 4, wherein a predetermined program is written in the memory, and tuning is performed according to the written program. Made radio receiver.