JPH0113768B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a receiver capable of displaying the name of the broadcasting station currently being received. The receiver will be explained below in terms of a radio receiver. Conventional radio receivers used a guide to indicate the frequency of the broadcasting station they were receiving, but with this method, if there were adjacent stations, it was difficult to tell which one was the desired broadcasting station. There is a trend in radio receivers to adopt digital display methods so that the reception frequency can be directly read. FIG. 1 is a block diagram of the main parts of an electronic tuning radio receiver using a 4-bit microcomputer (hereinafter abbreviated as 4-bit microcomputer) for radio tuner control (PLL synthesizer control). is a high frequency amplifier circuit,
12 is a mixing circuit, 13 is an intermediate frequency amplification circuit, 14
is a detection circuit, 15 is a power amplifier circuit, 16 is a speaker, 17 is a local oscillation circuit, 18 is a PLL IC, 1
9 is a bit microcomputer, 20 is a group of operation keys consisting of keys _k1 to _k20 , 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 is sent to the display device 21 to display the received frequency. For example, the 4-bit microcomputer 19 is manufactured by Toshiba.
FM/AM synthesizer tuner controller
TC9124AP is adopted, and as the PLL IC 18, for example, Toshiba's C-MOS LSI TC9123P for PLL 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, the keys in the same row of the operation key group 20 are connected to the same input terminal, and 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 keys _k1 to _k5 is input to the input terminal _in1.
~input in ₅ . Similarly other timing signals
When T ₂ to _{T 4} are on, only the information of the keys in the respective columns is input to the input terminals in ₁ to in ₅ . 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
~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 received frequency data of the minimum digit,
The output information at timings T ₂ , T ₃ , and T ₄ is set in advance so as to sequentially indicate reception frequency data of larger digits. 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. In radio receivers that can display the received frequency digitally, it has become easier to determine whether or not the desired broadcasting station is available than with the conventional pointer display. However, this is only possible if the user himself/herself knows the frequency of the broadcasting station, and if the user does not know the frequency, it is still difficult to quickly select the desired broadcasting station for reception. The present invention has improved on these conventional drawbacks, and its purpose is to display the station name of the broadcasting station currently being received together with the reception frequency, thereby allowing quick selection and confirmation of the desired broadcasting station. The goal is to make it possible. Examples will be described in detail below. FIG. 4 is a block diagram of main parts of a radio receiver according to an embodiment of the present invention, which is equipped with a broadcasting station name display function. The same reference numerals as in FIG. is that address,
data and control bus, 32 is routine
ROM, 33 is a broadcasting station name map ROM, 34 is a character generator ROM for Alphabetical and Katakana, etc., 35 is a RAM, and 36 is an input/output interface circuit such as a peripheral interface adapter (hereinafter referred to as an I/O port). ), 37 is an AND circuit, 38 is an LCD (liquid crystal) driver, and 39 is an LCD display. In the figure, a 4-bit microcomputer 19 and an 8-bit microprocessor 30 are connected to an I/O port 36.
It is directly connected using. That is, the frequency data output terminals out ₁ to _{out 4} and the output terminals of the timing signals T ₁ to T ₄ of the 4-bit microcomputer 19 are connected to the input terminals I ₁ to _{I 8} of the I/O port 36, and the timing signal T AND circuit 37 with inputs from ₁ to _T4
is provided, and its output is input to the interrupt signal input terminal INT of the I/O port 36. The 4-bit microcomputer 19 can operate independently for controlling the PLL synthesizer, and operates in synchronization with independently generated timing signals _T1 to _T4 as described above. Also,
The 8-bit microprocessor 30 is also connected to the 4-bit microcomputer 19 and other microcomputers (not shown) for controlling a cassette deck, for example.
Management 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 an 8-bit microprocessor 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. , and its rising 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 T ₁ to _{T 4} , and the frequency data output from the frequency data output terminals out ₁ to out ₄ of the 4-bit microcomputer 19 is established as shown in FIG. By reading the data through the I/O port 36 within the period, it becomes possible to synchronize both. FIG. 6 is a flowchart of the above operation, in which the timing signal is determined using the upper 4 bits of the 8 input bits, and the lower 4 bits are masked. Furthermore, the determined receiving frequency data is stored in the RAM 35 by using only the lower 4 bits and inserting "0" into the upper 4 bits, for example, using a 4-byte memory area as shown in Figure 7. Let's do it. When the frequency of the broadcasting station currently being received is detected by the 8-bit microprocessor 30 in this way, the name of the broadcasting station is detected and displayed in the following manner. The broadcasting station name map ROM 33 stores the names of broadcasting stations corresponding to the received frequencies in advance.For example, as shown in the following table, the names of broadcasting stations are
Two broadcast station name maps are available. In addition, the station name is coded, for example, JIS code,
For FM NHK 46, 4D, 4E, 48, 4B
is stored as.

[Table] When the 8-bit microprocessor 30 is activated, the received frequency is stored in the index register iX.
Reg, and its contents and station name map
The frequency data in the ROM 33 is sequentially compared.
That is, as shown in Figure 9, the broadcasting station name map
The ROM33 stores a 2-byte frequency storage area followed by a 10-byte coded broadcasting station name, so index registers iX(H) and iX
Compare the contents of (L) with its frequency data. If they match, the broadcasting station name code is read out and transferred to the broadcasting station name storage area. Figure 10 a, b
shows an example of the state of the above comparison operation when receiving 1008KHz and 85.1MHz. Figure 10c also 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. 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 is 10 0 8, so the receiving band can be determined by whether the lined character is a decimal point or not, and from this, the unit code of the receiving frequency can be read out. is possible. That is, when the line part is a decimal point, read [MHz] from the ROM area shown in Figure 11,
When it is 0 to 9, read out [KHz]. FIG. 12 shows a flowchart of this operation. Now, the 8-bit microprocessor 30 determines the start address of the character generator ROM 34 from the broadcasting station name code obtained in the above manner, reads out a character for display, and inputs it to the LCD driver 38. Further, received frequency data and frequency unit data are also processed in the same way. As a result,
The LCD display 39 will display the broadcasting station name along with the received frequency. In this embodiment, an LCD display is used as the display, but it goes without saying that other displays, such as a CRT display, may also be used. When adopting a CRT display, it is necessary to add hardware such as video RAM and a synchronization signal generator for driving the CRT. Further, after the reception band is determined by the operation shown in FIG. 12, the search for the broadcasting station name may be performed only on the broadcasting station name map of that band. FIG. 13 shows an operation flowchart at that time. Note that the routine ROM 32 in FIG.
Programs such as a program for operating the O port 36 are built-in. By the way, for example, FM 82.5MHz is FM Tokyo in the Tokyo area, and FM NHK in the Nagoya area. In this way, when there are multiple broadcast station names on the same frequency, it is necessary to select one. Such a problem can be solved by making a list of the frequencies received when the radio receiver searches within the band and making judgments from the context. For example, the situation within the FM band in the Nagoya area is shown in table (a) below.
The Tokyo area is shown in the following table (b), so 82.5M
When receiving Hz, it can be determined whether the area is Nagoya or Tokyo depending on whether 70.7MHz or 80.0MHz was previously received.

[Table] As can be seen from the above explanation, according to the present invention,
Since the name of the broadcasting station is displayed along with the reception frequency, it is possible to quickly select and confirm the reception of the desired broadcasting 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. A main part block diagram, FIG. 5 is a timing chart for explaining its operation, FIGS. 6, 8, 12 and 13 are operation flowcharts of the 8-bit microprocessor 30, and FIG. 7 is a reception frequency data For storage
ROM configuration diagram, Figures 9 and 10 are operation explanation diagrams for broadcasting station name search, and Figure 11 is frequency unit storage.
It is a block diagram of ROM. 19 is a 4-bit microcomputer, 20 is a group of operation keys,
30 is an 8-bit microprocessor, 32 is a routine ROM, 33 is a broadcasting station name map ROM, 34
is character generator ROM, 36 is I/O
port, 38 is an LCD driver, and 39 is an LCD display.

Claims (1)

[Claims] 1. In an electronic tuning receiver equipped with a tuner control microcomputer capable of digitally displaying the receiving frequency, a broadcasting station name map ROM that pre-stores coded broadcasting station names corresponding to the receiving frequency; A character generator ROM that converts the coded broadcasting station name read from the station name map ROM into a display character, a display that displays the display character, and a character generator ROM that searches and receives the broadcast station name map ROM. In addition to reading the broadcasting station name corresponding to the frequency, if there are multiple broadcasting station names corresponding to the received frequency, select the broadcasting station name based on the regional information identified from the previously received frequency and display it. 1. A receiver equipped with a broadcasting station name display function, characterized in that it is equipped with a microprocessor for displaying a broadcasting station name on a receiver.