JPS5870620A - Radio receiver provided with preset list display function - Google Patents

Abstract

PURPOSE:To quickly select and receive a desired broadcast station, by providing a preset list forming RAM storing the channel number and reception frequency of a broadcast station preset as a preset list, and displaying the storage content of the RAM on a display device. CONSTITUTION:A 4-bit microcomputer 19 for radio tuner control (for PLL synthesizer control) and an 8-bit microprocessor 30 are connected with I/O ports 34-36. The microprocessor 30 inputs operation key information (channel selection instruction) to the computer 19 with an operation key group 32. The frequency data and channel number of the computer 19 are read at the microprocessor 30 and stored in a preset list forming RAM 41. This list is sequentially read out and converted into characters for display at a character generator ROM 40 and this is stored in a video RAM 42. The broadcast station name list is displayed together with the reception frequency list.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radio receiver having a preset list display function capable of displaying preset contents of preset broadcast stations as a list.

Recently, microcomputers have been introduced into radio receivers, making it possible to perform complex functions such as direct selection of the desired broadcasting station, digital display of the receiving channel and receiving frequency, etc., with just a small 8-D square.

FIG. 1 is a block diagram of the main parts of a conventional electronic tuning radio receiver using a 4-bit microcomputer (hereinafter referred to as 4-bit microcomputer) for radio tuner control (PLL synthesizer control). An antenna, 11 is a high frequency amplification circuit, 12 is a mixing circuit, 15 is an intermediate frequency amplification circuit, 14 is a detection circuit, 15 is a power amplification circuit,
16 is a speaker, 17 is a local oscillation circuit, 18 is a PLL IC 119 is a 4-bit microcomputer, and 20 is a key with 1 to 2.
A group of operation keys 21 is a display device.

In the same figure (=, the control voltage from ICl3 for PLL -
7, the tuning frequency of the high frequency amplifier circuit 11 and the oscillation frequency f0 of the local oscillation circuit 18 are controlled, and the radio waves of the desired broadcasting station are selected for reception, intermediate frequency amplified, and sent to the speaker via the detection circuit 14 and the magnetic force amplification circuit 15. I am led to 16.

The 4-bit microcomputer 19 has a channel selection function that operates in response to the operation of the operation keys 20, outputs the necessary frequency division ratio setting data output terminal) to the PLL ICl 8, and displays frequency data and the display device 21. It sends channel number data and displays the receiving frequency and channel number.

As the 4-bit microcomputer 19, for example, Toshiba FM/AM
Controller TC91241P for Shinsenai Detewuna
Equivalent products are adopted, and examples of ICl3 for PLL include Toshiba N PLL IfJ C-MOS LSI TC91.
25F power sampling Salel.

The 4-bit microcomputer 19 operates in synchronization with internally generated timing signals 11 to T4, and input terminals &
fil ~L n6 and output terminal -μt +-0+
u t4 is used for a different purpose at each timing T, ~T. That is, in the same row 6 of the operation key group 2o, certain keys are connected to the same input terminal, but their output timings are controlled by column selection timing signals 11 to T4, for example, as shown in FIG. When the timing signal T is on, only information from 1 to kl is sent to the terminals μ, ~i, and
is input. Similarly, when the other timing signals 13 to T4 are on, only the information of the keys in the respective columns is input to the input terminals in, to 6r&,. Then, the 4-bit microcomputer 19 inputs the two-person terminal in1 at each timing.
It reads the input information of *nH and obtains the information of 1 to &4 for all keys. In addition, in the case of frequency data output, for example, the output information at timing T indicates the reception frequency data of the minimum digit, and timing T! #TsgT'4C;
The output information is set in advance so as to sequentially indicate reception frequency data of larger digits. For example, FM82.
When displaying 5MH2, the relationship between the outputs of the output terminals 0uil-- and the timing signals 11-T4 is as shown in FIG. 3, for example. In addition, to select a broadcasting station, use the operation key group 2.
This can be done directly by simply pressing any preset key within 0.

By the way, as mentioned above, with radio receivers that can digitally display the receiving frequency and channel number, it is easier to determine whether or not the desired broadcasting station is available than with the conventional guideline display, but it is easier to determine whether or not the desired broadcasting station When trying to select a station, unless you remember the preset number of that station, you will have to press multiple preset keys in order to find the desired station, making it difficult to quickly select the desired station. .

Since the preset contents of in-vehicle receivers such as car radios often change each time they are moved, this can be said to be particularly difficult.

The present invention improves these conventional drawbacks, and
The purpose of this is to display the preset contents of preset broadcasting stations as a list on a CRT display, etc., thereby making it possible to quickly select a desired broadcasting station.The following is an example (2). In detail, I have an older brother and 1st son.

FIG. 4 is a block diagram of the main parts of a radio receiver according to an embodiment of the present invention, which is equipped with a preset list display function. The same reference numerals as in FIG. 32 is a group of operation keys, 3+3 is a RAM for data storage and retention, 34 to 56 are input/output interface circuits, and 45 are input/output interface circuits (hereinafter referred to as I10 ports); 57 is an AND circuit, 38 is a broadcasting station name map ROM, and 59 is a routine ROM.
, 40 is a ROM for the character generator, 41 is a RAM for creating a preset list, 42 is a video RAM
, 43 is a CRT display, and 44 is a synchronizing signal generator.

Routine ROM39 C8 bit microprocessor 3
0 operation program, I10 port 34-56.4
5 operation programs and other necessary programs are stored.

In the figure, a 4-bit microcomputer 19 and an 8-bit microprocessor f50 are directly connected using VO ports 64-36. That is, the frequency data output terminal of the 4-bit microcomputer 19 is 1% out.

The output terminals of the timing signals 11 to T4 are connected to the input terminals 11 to I6 of the I10 boat 35, and the channel number output terminals 0tLt5 to ou of the 4-bit microcomputer 19 are connected to the output terminals of the timing signals 11 to T4.
t@ and the input terminals I□-I4 of the I10 boat 36 are connected, and the output terminals 01-Os of the I10 boat 64 are connected to the key information input terminals in□-Ln5 of the 4-bit microcomputer 19. Further, an AND circuit 37 is provided which receives the timing signals 11 to T4 as input, and outputs the AND circuit 37 to the I10 hoard 3.
It is input to the interrupt signal input terminal INT of No. 6. The 4-bit microcomputer 19 can operate independently as a PLL synthesizer, as described above.

It operates in synchronization with timing signals 11-T generated in German H. The 8-bit microprocessor 60 also manages the 4-bit microcomputer 19 and other devices, such as a cassette deck control microcomputer (not shown), at its own timing I: synchronization. Therefore, the synchronization of both? In the present invention, this synchronization is achieved by the program processing of the 8-bit microprocessor 60 as follows.

For example, as shown in Figure 5 (: 4-bit microcontroller 1
Period Δ' during which all timing signals of 9 are off, even if only slightly.
If there is 1 sΔt2, the output waveform of the AND circuit 57 will be as shown in FIG. 5, for example, and its fall coincides with the rise of the new timing signal. Therefore, when the output signal of the AND circuit 57 falls, it is possible to notify the 8-bit microprocessor 30 that the timing signals T1 to T4 of the 4-bit microcomputer 19 have changed by applying two side inputs. Yes, and within the 8-bit microprocessor's 30 interrupt handling processes, 4
The timing signals T1 to T4 of the bit microcomputer 19 are input to determine the current timing, and as shown in FIG. The data is read through the I10 port 55 within the established period, and the key information according to the timing is sent from the I10 port 54 to the key information input terminal t of the 4-bit microcontroller Y19.
s1~iζC Two people working C: It becomes possible to synchronize both parties.

Similarly, the channel numbers outputted from the 4-bit microcomputer 190f-Yannel pick-up output terminals e#4-out are read. Incidentally, when Δt1 of the timing signal shown in FIG. 5 becomes zero, the AND circuit '57 may be replaced by a differentiating circuit C: which detects the fall of each timing signal T, -T4.

In the above operation (:), the 8-bit microcomputer 30 inputs key information corresponding to each timing of the 4-bit microcomputer 19 to the key information input terminal L of the 4-bit microcomputer 19.
It is necessary to input it to Wm"" @R1.

This means, for example, that the 4-bit microcomputer 19
1 to T4 (-, each input terminal in, ~1fiI (
2. If the following information is required, the results of timing signal determination in Table 1, for example, timing 11.
, it means that it is necessary to output the key information from 1 to 60 to the key from the 8-bit microprocessor 4). Therefore, the 8-bit microprocessor fsO reads the status of each key in the operation switch group 52 at regular intervals and selects only the information from 1 to 2 for the necessary keys. , and at each timing T, ~T4 (: Correspondingly, 1 to 20 status information is stored for each key in the order shown in the previous table Rm55ζ: In other words, a table of matrix switch signals for 4-bit microcontrollers. is created in the RAM 33, and after determining the timing signal, the corresponding key information is sequentially output from the table and sent to the 4-bit microcontroller 19.
This is what is output to. Note that reading the key information of the operation key group 62 can be done, for example, by sequentially selecting each column of the operation key group 32 using timing signals t1 to t4, and reading the key information of each selected column via the I10 port 45. It will be held in

FIG. 6 is a flowchart of the electrical matrix switch signal output operation performed by the 8-bit microprocessor 30, in which the portion surrounded by broken lines is performed by interrupt processing.

FIG. 7 is a flowchart of the frequency data input operation carried out by the 8-pit microprocessor 50. Timing signal determination is performed using the upper 4 pits of the 8 input bits, and the lower 4 bits are masked. Furthermore, the determined receiving frequency data is stored in the RAM 55 by using only the lower 4 bits and inserting "0" into the upper 4 bits, using a 4-byte memory area, for example, as shown in FIG. .

As described above, the frequency data and channel number of the 4-bit microcomputer 19 are read by the 8-bit microprocessor 50, and the 4-bit microcomputer 19ζ key information can be input from the 8-bit microprocessor 50. 8
When the preset list display key in the operation key group 32 is turned on, the BIT Microprocessor+50 uses these data exchange functions to create and display a preset list as follows.

That is, when the preset list display key is turned on, the 8-bit microprocessor 30 sequentially turns on the preset keys from the lowest number to the electric matrix switch signal output operation 1 described above. When a preset key is turned on, the 4-bit microcomputer 19 reads out the pre-stored frequency division ratio setting data corresponding to that key and provides it to the PLL ICl 3, and also sets the reception frequency and channel number corresponding to the division ratio. All preset information (receiving frequency and channel number) of the 4-bit microcomputer 19 is output to I10 baud by turning on the preset keys one after another.
55.5+61: will be output. The 8-pit microprocessor 30 reads each preset information according to the operations described above, and from the read data creates a preset list in Rm 41 for creating a preset list as shown in FIG. 9, for example.

Then, the second 8-bit microprocessor 9-30 sequentially outputs the preset list obtained in the above manner, converts it into display characters in the character generator RQM40, and stores the preset list in a predetermined area of the video RAM 42. Store in. Also, the reception frequency column in the radio preset list is set to FM band preset...for example, 85U1A.
When presetting M band...For example, it is 1008, so you can determine the receiving band by checking whether the character with a - line is a decimal point or not, and reading the unit code of the receiving frequency from this (-) That is, when the - line part is a decimal point, (MHz) is read from the ROM area indicated by 1011iA (:), and when it is 0 to 9, [KH2] is read. This operation is shown in FIG. The flowchart is shown below.

The unit code of this received frequency is converted into a display character by a character generator 40 and then stored in the video RAM.
It is stored immediately after the frequency data storage position of 42.

The CRT display 43 displays the video Rm42 in synchronization with the horizontal synchronization signal H and the vertical synchronization signal V from the synchronization signal generator 44.
Displays memory information. The following table shows an example of a preset list displayed on a CRT display. By displaying such a list, the user can quickly select the desired broadcasting station. .

Table 2 Note that a preset list is created every time the preset list display key is turned on (it may be done twice).

After creating the list, set the content I: If there is no change, display the created list (2).
.

By the way, if the user does not know the frequencies of broadcast stations, it is not easy to select a desired broadcast station even if a list of reception frequencies is displayed. In such a case, it would be very convenient if a list of broadcasting station names could be displayed along with the list of reception frequencies.

The radio receiver of this embodiment also takes measures against this problem. This will be explained below.

In the broadcast station name map ROM 3B, for example, as shown in the following table, broadcast station names are stored in advance for the FM frequency band and the AM frequency band (:) corresponding to the receiving frequency.

In addition, station names are coded, for example, JIs code, in the case of FM NHK, 46.4D, 4B, 48
, 4B, the 8-bit microprocessor 3o stores the received frequency in the index register (iX, Ray) l: as shown in the flowchart of FIG. That is, as shown in Figure W&13, 62, broadcasting station name map ROM 5B, C is a 2-byte frequency storage area 2: followed by a 10-byte coded broadcasting station name is stored. Therefore, index register jJ(H)
, 1X(L) is compared with its frequency data. If they match, L2 successively outputs the broadcasting station name code and transfers it to the broadcasting station name storage area 62 of RA1d55.

Figure 14 (tlEl, (b) is 1008 KHz
Fig. 14 (C1 shows the final comparison operation when there is no match, and the end of the conversion table is determined by the FFFF code. , the space code is output one after another.The 8-bit microprocessor +50 calculates the start address of the character generator ROM 40 from the obtained broadcasting station name code, outputs display characters one after another, and stores the video RAM 42 Store it in a predetermined area.

As a result, for example, as shown in Table C below, a list of broadcasting station names can be displayed along with a list of reception frequencies.

Table 4 Note that, for example, FM 82.5 MHz is FM Tokyo in the Tokyo area, and FM NHK in the Nagoya area.

In this way, if there are multiple broadcasting station names on the same frequency, it is necessary to select them;
This problem can be solved by making a list of the frequencies received when Th searches within the band, and making judgments from the context. For example, the situation within the FM band in the Nagoya area is as shown in the following table (α), and in the Tokyo area as shown in (b) (2), so when 82.5 MHz is received, the situation in the FM band previously received is 80, 7 MHz. Received or 80.0M1
Depending on whether iz is received, it can be determined whether the area is Nagoya or Tokyo.

As can be seen from the above description, according to the present invention, a preset list of broadcast stations set in advance is displayed on a CRT display, etc., so that the user can quickly select and receive a desired broadcast station. . Therefore, it is very effective to apply the radio receiver of the present invention to a vehicle-mounted receiver or the like.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the main parts of a radio receiver using an electronic tuning method using a 4-pit microcomputer, Figs. 2 and 3 are timing charts for explaining its operation, and Fig. 4 is a main part of a radio receiver according to an embodiment of the present invention. Fig. 5 is a timing chart for explaining its operation, Fig. 6, Fig. 7, Fig. 11,
Figure 12 is an operation flowchart of the 8-bit microphone processor F-30, and Figure 8 is the ROM for storing reception frequency data.
9 is a configuration diagram of the RAM for preset list creation, FIG. 10 is a configuration diagram of the frequency unit storage ROM,
3 and 14 are explanatory diagrams of the operation of broadcasting station name search. 19 is a 4-bit microcomputer, 20.52 is a group of operation keys, 3
0 is an 8-bit microprocessor, 34 to 36, 45 are Iβ boats, and 40 is a ROM for a character generator. Patent applicant Fujitsu Ten Ltd. (1 other person) [Figure 8 Figure 9 Figure 1θ Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] i7o receiver (=
and a preset list creation RAM that stores channel numbers and reception frequencies obtained by changing the control microcomputer to each preset state as a preset list, and displays the preset list read out from the RAM. a character generator ROM for converting characters (2), a display device for displaying display characters, and a microprocessor for controlling these to read out a preset list from the preset list creation RAM and display it on the display device. A radio receiver equipped with a preset list display function.