JPH0113769B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a receiver, such as a radio receiver, which has a preset list display function that can display 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 a desired broadcasting station, digital display of reception channels and reception frequencies, etc., with a small amount of hardware. Figure 1 is a block diagram of the main parts of a conventional electronic tuning radio receiver using a 4-bit microcomputer (hereinafter abbreviated as 4-bit microcomputer) for radio tuner control (PLL synthesizer control). , 11 is a high frequency amplifier circuit, 12 is a mixing circuit, 13 is an intermediate frequency amplifier circuit, 14 is a detection circuit, 15 is a power amplifier circuit, 16
is the speaker, 17 is the local oscillation circuit, 18 is the PLL
19 is a 4-bit microcontroller, 20 is a key k ₁
-k ₂₀ is a group of operation keys, and 21 is a display device. In the same figure, the control voltage e _r from the PLL IC 18 is
The tuning frequency of the high frequency amplifier circuit 11 and the oscillation frequency ₀ 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 16 via the detection circuit 14 and the power amplifier circuit 15. be guided. The 4-bit microcomputer 19 has a tuning function that operates in response to the operation of the operation key group 20, and provides necessary frequency division ratio setting data (N value) for the PLL.
At the same time as being output to the IC 18, the frequency data and channel number data are sent to the display device 21 to display the received frequency and channel number. For example, the 4-bit microcomputer 19 is manufactured by Toshiba.
FM/AM synthesizer tuner controller
A product equivalent to TC9124AP is adopted, and as the PLL IC18, for example, Toshiba's C-MOS LSI for PLL is used.
TC9123P is adopted. The 4-bit microcomputer 19 operates in synchronization with internally generated timing signals _T1 to _T4 ,
The input terminals _in1 to _in5 and the output terminals _out1 to _out4 are used for different purposes at each timing _T1 to _T4 . That is, keys in the same row of the operation key group 20 are connected to the same input terminal, but their output timings are controlled by the column selection timing signals T ₁ to _{T 4} .
For example, as shown in Fig. 2, when the timing signal _T1 is on, only the information of the keys _k1 to _k5 is sent to the input terminals _in1 to
Input in ₅ . At the same time other timing signals T ₂
When ~ _T4 is on, only information about the keys in each column is input to input terminals _in1 to _in5 . Then, the 4-bit microcomputer 19 reads the input information of the input terminals in ₁ to in ₅ at each timing and inputs all the keys k ₁ to
k ₂₀ information is obtained. In addition, in the case of outputting frequency data, for example, the output information at timing T ₁ indicates the reception frequency data of the smallest digit, and the output information at timings T ₂ , T ₃ , and T ₄ sequentially indicates reception frequency data of larger digits. It is set in advance as follows. For example, in the case of displaying FM82.5MHz, the relationship between the outputs of the output terminals out ₁ to out ₄ and the timing signals T ₁ to T ₄ is as shown in FIG. 3, for example. Incidentally, it is possible to directly select a broadcasting station by simply pressing any preset key in the operation key group 20. 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 is selected. When attempting to do so, unless the preset number of that station is memorized, the user must press a plurality of preset keys in order to find the desired broadcasting station, making it difficult to quickly select the desired broadcasting station.
This is especially difficult for in-vehicle receivers such as car radios, since the preset contents are often changed each time the receiver is moved. The present invention is an attempt to improve such conventional drawbacks, and its purpose is to display the preset contents of preset broadcasting stations and the corresponding broadcasting station names as a list on a CRT display, etc., thereby making it possible to select a desired broadcast. The purpose is to enable prompt selection and confirmation of stations. Examples will be described in detail below. 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. is its address, data and control bus, 32 is a group of operation keys, 33 is for data storage and retention.
RAM, 34 to 36, 45 are input/output interface circuits, such as peripheral interface adapters (hereinafter referred to as I/O ports), 37
is an AND circuit, 38 is a broadcasting station name map ROM, 3
9 is a routine ROM, 40 is a ROM for character generator, and 41 is for creating a preset list.
RAM, 42 is video RAM, 43 is CRT display,
44 is a synchronization signal generator. Routine ROM3
9 stores a program for operating the 8-bit microprocessor 30, a program for operating the I/O ports 34 to 36, 45, and other necessary programs. In the figure, a 4-bit microcomputer 19 and an 8-bit microprocessor 30 are connected to an I/O port 34.
-36 are used to connect directly. That is, the frequency data output terminal out ₁ of the 4-bit microcomputer 19
out ₄ and the output terminals of the timing signals T ₁ to _{T 4} and the input terminals I ₁ to _{I 8} of the I/O port 35 are connected,
Channel number output terminals out ₅ to out ₈ of the 4-bit microcomputer 19 and input terminals I ₁ to I/O port 36
_I4 is connected, and the output terminal _O1 of I/O port 34
_O5 is the key information input terminal of the 4-bit microcontroller 19
Connected to in ₁ ~ in ₅ . Further, an AND circuit 37 is provided which receives the timing signals T ₁ to _{T 4} as input,
The output is connected to the interrupt signal input terminal of I/O port 36.
Input to INT. 4-bit microcontroller 19
It can operate independently for PLL synthesizer control, and operates in synchronization with independently generated timing signals T ₁ to _{T 4} as described above. In addition, the 8-bit microprocessor 30 is also the 4-bit microprocessor 1.
9 and other components, such as a microcomputer (not shown) for controlling the cassette deck, etc., are executed in synchronization with its own timing. Therefore, it is necessary to establish synchronization between the two, and in the present invention, this synchronization is achieved by program processing of the 8-bit microprocessor 30 as follows. That is, if the timing signals of the 4-bit microcomputer 19 have periods Δt ₁ and Δt ₂ during which they are all off, even if only slightly, as shown in FIG. 5, the output waveform of the AND circuit 37 will be as shown in FIG. 5, for example. The falling edge coincides with the rising edge of the new timing signal. Therefore, by interrupting the 8-bit microprocessor 30 at the falling edge of the output signal of the AND circuit 37, 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. can. Then, within the interrupt processing of the 8-bit microprocessor 30, the timing signal of the 4-bit microprocessor 19 is
The current timing is determined by inputting _T1 to _T4 , and the frequency data output from the frequency data output terminals _out1 to _ont4 of the 4-bit microcomputer 19 is established as shown in Figure 5. The data is read through the I/O port 35 within the period, and the key information according to the timing is sent from the I/O port 34 to the key information input terminal in ₁ of the 4-bit microcomputer 19.
By inputting to ~in ₅ , it is possible to synchronize both. Similarly, the channel number output terminals out ₅ to out ₈ of the 4-bit microcomputer 19 are
The channel number output from is read. Incidentally, when Δt ₁ of the timing signal shown in FIG. 5 is zero, a differentiating circuit for detecting the fall of each of the timing signals T ₁ to _{T 4} may be used instead of the AND circuit 37. In the above-described operation, the 8-bit microcomputer 30 needs to input key information corresponding to each timing of the 4-bit microcomputer 19 to the key information input terminals in1 _{to in5 of} the 4-bit microcomputer 19. This means that, for example, the 4-bit microcomputer 19 connects each input terminal in ₁ to in ₅ at each timing T ₁ to T ₄ .
If you require the following information for each

[Table] Results of timing signal discrimination, e.g. timing
If T ₁ , it means that the key information of keys k ₁ to _{k 5} needs to be output from the 8-bit microprocessor 30. To this end, the 8-bit microprocessor 30 reads the state of each key in the operation switch group 32 at regular intervals, selects only the information on the keys _k1 to _k20 necessary for the 4-bit microcomputer 19, and The state information of each key _k1 to _k20 is stored in the RAM 33 in the order shown in the previous table corresponding to _T1 to _T4 . That is, a table of matrix switch signals for the 4-bit microcomputer is created in the RAM 33, and after determining the timing signal, the corresponding key information is read from the table and output to the 4-bit microcomputer 19. It is. In addition, operation key group 3
To read each key information of 2, for example, use the operation key group 3.
2 sequentially by timing signals _t1 to _t4 ,
This is done by reading the key information of each selected column via the I/O port 45. Figure 6 shows the above 8-bit microprocessor 3.
This is a flowchart of the electrical matrix switch signal output operation performed by No. 0, in which the portion surrounded by broken lines is performed by interrupt processing. FIG. 7 is a flowchart of the frequency data input operation performed by the 8-bit microprocessor 30, in which the timing signal is determined using the upper 4 bits of the 8 input bits, and the lower 4 bits are masked. Also, the determined received frequency data
When storing data in the RAM 33, only the lower 4 bits are used and "0" is inserted into the upper 4 bits.
This is done using a 4-byte memory area as shown in the figure. As described above, the frequency data and channel number of the 4-bit microprocessor 19 are read by the 8-bit microprocessor 30, and key information can be input from the 8-bit microprocessor 30 to the 4-bit microprocessor 19. When the preset list display key of the operation key group 32 is turned on, the 8-bit microprocessor 30 uses these data exchange functions to create and display a preset list in the following manner. That is, when the preset list display key is turned on, the 8-bit microprocessor 30 sequentially turns on the preset keys starting from the lowest number by the above-described electric matrix switch signal output operation. When the preset key is turned on, the 4-bit microcomputer 19 reads out the pre-stored frequency division ratio setting data corresponding to that key, provides it to the PLL IC 18, and outputs the receiving frequency and channel number corresponding to the frequency division ratio. Therefore, by sequentially turning on the preset keys, all preset information (receiving frequency and channel number) of the 4-bit microcomputer 19 is transferred to the I/O.
It will be output to O ports 35 and 36. 8
The bit microprocessor 30 reads each preset information according to the operations described above.
For creating a preset list from this read data.
For example, a preset list as shown in FIG. 9 is created in the RAM 41. And then the 8-bit microprocessor 30
reads out the preset list obtained in the above manner sequentially, converts it into display characters in the character generator ROM 40, and converts it into a video character.
It is stored in a predetermined area of RAM 42. Also, the receiving frequency field in the radio preset list will be set to 85.0 when presetting the FM band . 1 When presetting the AM band...For example, it will be 10 0 8, so The reception band can be determined depending on whether the lined character is a decimal point or not, and thereby the unit code of the reception frequency can be read. That is, When the part is a decimal point, [MHz] is read from the ROM area shown in FIG. 10, and when it is 0 to 9, [KHz] is read. FIG. 11 shows a flowchart of this operation. This reception frequency unit code is converted into a display character by a character generator 40 and then stored immediately after the frequency data storage location in the video RAM 42. The CRT display 43 displays the information stored in the video RAM 42 in synchronization with the horizontal synchronization signal H and vertical synchronization signal V from the synchronization signal generator 44. The following table is
This shows an example of a preset list displayed on the CRT display 43. By displaying such a list, the user can quickly select a desired broadcast station.

[Table] Note that a preset list can be created each time the preset display key is turned on, but if there are no changes to the preset contents after the list is created, the previously created list can be displayed. good. By the way, if the user does not know the frequency of a broadcast station, 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 received frequencies. The radio receiver of this embodiment also takes measures against this problem. This will be explained below. In the broadcasting station name map ROM 38, broadcasting station names are stored in advance in correspondence with reception frequencies for the FM frequency band and the AM frequency band, as shown in the following table, for example.

[Table] Station names are coded, for example, JIS code, and in the case of FM NHK, 46, 4D, 4
It is stored as E,48,4B. The 8-bit microprocessor 30 sets the received frequency in the index register (iX.Reg) as shown in the flowchart of FIG. 12, for example, and sequentially compares the contents with the frequency data in the broadcast station name map ROM 38. do. That is, as shown in FIG. 13, the broadcasting station name map ROM 38 stores a 2-byte frequency storage area followed by a 10-byte coded broadcasting station name, so the index register iX (H ), iX・(L) are compared with the frequency data. If they match, the broadcasting station name code is read out and transferred to the broadcasting station name storage area of the RAM 33. Figure 14 a, b
shows an example of the state of the above comparison operation when receiving 1008KHz and 85.1MHz. Figure 14c shows the final comparison operation when there is no match, FFFF
The end of the conversion table is determined by the code, and the space code is read. The 8-bit microprocessor 30 reads the character generator ROM from the broadcasting station name code obtained as described above.
40, the character for display is read out and stored in a predetermined area of the video RAM 42. For example, as shown in the table below,
A list of broadcast station names can be displayed along with the list of received frequencies.

[Table] For example, FM 82.5MHz is in the Tokyo area.
FM Tokyo, and FM NHK in the Nagoya area. In this way, when there are multiple broadcasting station names on the same frequency, it is necessary to select one, but this is done by making a list of the frequencies received when the radio receiver hits the band, and checking the relationship between the two. It is solved by determining from For example, in the Nagoya area
For example, the situation within the FM band is as shown in the following table (a), and the Tokyo area is as shown in (b), so 82.5M
When receiving Hz, it can be determined whether the area is Nagoya or Tokyo depending on whether 80.7MHz or 80.0MHz was previously received.

[Table] As can be seen from the above explanation, according to the present invention,
Since the preset contents of the broadcast stations set in advance and the corresponding broadcast station names are displayed as a list on a CRT display or the like, the user can quickly select and receive the desired broadcast station. Therefore, it is very effective to apply the receiver of the present invention to a vehicle-mounted receiver or the like.

[Brief explanation of drawings]

Figure 1 is a block diagram of the main parts of a radio receiver using an electronic tuning method using a 4-bit microcomputer, Figures 2 and 3 are timing charts for explaining its operation, and Figure 4 is a diagram of a radio receiver according to an embodiment of the present invention. Main part block diagram, FIG. 5 is a timing chart for explaining its operation, FIGS. 6, 7, 11, and 12 are operation flowcharts of the 8-bit microprocessor 30, and 8th is a receiving frequency data storage. Figure 9 shows the RAM for creating a preset list.
FIG. 10 is a configuration diagram of the frequency unit storage ROM, and FIGS. 13 and 14 are explanatory diagrams of the operation of broadcasting station name search. 19 is a 4-bit microcomputer, 20 and 32 are a group of operation keys, 30 is an 8-bit microprocessor, and 34
36 and 45 are I/O ports, and 40 is a ROM for the character generator.

Claims (1)

[Claims] 1. Broadcasting in which a broadcasting station name coded in accordance with the reception frequency is stored in advance in an electronic tuning receiver equipped with a tuner control microcomputer that has a preset function and can digitally display the channel number and reception frequency. Station name map
ROM, RAM for creating a preset list that stores preset reception frequencies and corresponding channel numbers as a preset list, and a RAM for creating a broadcast station name map ROM and preset list.
A character generator ROM that converts the broadcast station name and preset list read from the RAM into display characters, a display device that displays the display characters, and a broadcast station name map ROM that is searched and preset. In addition to reading the broadcasting station name corresponding to the received frequency, if there are multiple broadcasting station names corresponding to the preset received frequency, the broadcasting station name is read based on the regional information identified from the previously received frequency. a microprocessor that selects a preset list, reads a preset list from the preset list creation RAM, and displays the channel number, receiving frequency, and broadcasting station name in correspondence with each other on the display. A receiver equipped with a preset list display function.