JPS6050088B2 - Receiving machine - Google Patents

Description

[Detailed Description of the Invention] When using a car radio when traveling to an unfamiliar place, it is common to not know the frequency of the local broadcasting station, so it is necessary to adjust the dial each time to listen to the radio. be.

However, this does not necessarily mean that the local station can be received reliably. This is inconvenient when you want to know local road information or news.

In addition, in a car radio that is frequently moved, it is a nuisance to select a station each time, and furthermore, it may impede safe driving. The present invention aims to provide a receiver that eliminates these problems.

Let's explain one example below.

In FIG. 1, 10 indicates an electronically tuned FM tuner circuit, 11 is a high frequency tuning circuit thereof, 12 is a high frequency amplifier, 13 is an interstage tuning circuit, 14 is a mixer circuit, 1
5 is a local oscillation circuit, and 16 is its resonance circuit.

These tuning circuits 11 and 13 and the resonant circuit 16
has, for example, a variable capacitance diode as a resonant element,
By changing the level of the tuning voltage Et supplied to this, a frequency corresponding to the level of the voltage Et can be received. And this tuning voltage Et is
It is obtained by D-to-A conversion of the digital channel selection code F in the D-A converter 17, and the code F and the receiving frequency are associated with each other as shown in FIG. 4, for example.

That is, when F=0, the reception frequency is 76.0M
H2, and thereafter, each time the code F increases by 1'', the reception frequency increases by 100KH2, and when F2 is 140, the reception frequency becomes 90.0MH2. The right column of Figure 4 shows the Kanto region (and its surrounding areas).
For example, when F■65, the reception frequency is 82.5MH2, which is NH
K is the frequency of Tokyo. In addition, 21 is an intermediate frequency amplifier,
22 is an FM demodulation circuit, 23 is a low frequency amplifier, and 24 is a speaker.

Further, 30 is a CPU) 31 is a data bus, 32 is an address bus, and 33 is a control bus. These bus lines 31 to 33 are connected to a ROM 41, a RAM 42, and P1A 43 to 45. As shown in Figure 2, there is an LED 46 for displaying 4-digit, 7-segment numbers, and an LED LN (N
=0 to 31) are connected to the PIA 44, and a scanning switch 5w and a channel selection switch SN, which will be described later, are connected to the PIA 44.

Further, the above-mentioned channel selection code F is extracted from the PIA 45 and supplied to the converter 17, and a part of the intermediate frequency signal is supplied to the detection circuit 25 to detect the presence or absence of the received signal. Supplied to PIA45. The ROM 4l has a program written in the flowchart shown in FIG. 6, for example.

This flowchart will be described later, but the steps [
Steps 10] to 19 are routines that sweep the receiving band to detect the frequency on which broadcasting is being performed, and store that frequency. Routine to display the station, [30] to [33]
is a routine for selecting a desired station. And R.O.
For example, a table list shown in FIG. 5 is also written in M4l (the broadcasting station names in the right column are for reference and are not written there).

In other words, the list in Figure 5 corresponds to the Kanto region, where N is the code number assigned to the broadcasting station that can be received in the Kanto region (assignment method is arbitrary), and T (N).
is the value of the tuning code F of that broadcasting station, for example, NH
In the case of K Tokyo, N=1, and from Figure 4, N
Since F=65 for HK Tokyo, T(1)=65. Furthermore, LED LN and switches SW and SN are provided as shown in FIG. 3, for example. That is, the third
In the figure, 50 indicates a dial port, which is made of, for example, a plate, and a map 51 of the Kanto region is drawn on its surface corresponding to the table list of FIG. 5. And, as an example, switch SN is an LED
It is self-illuminating with an integrated LN, and is installed at the location of the broadcasting station (transmitting station) on the map 51. In this case, the suffix N of the codes of switches SN and LEDLN is equal to the code number N in the list of FIG. . For example, in NHK Tokyo, N=1, so switch S1 and LED Ll are
It will be located at the location of Tokyo Tower, which is the transmitting station for NHK Tokyo. Further, this board 50 and the LED 46 in FIG. 2 are provided close to each other, and the switch Sw is provided, for example, at or near the margin of the map 51.

Next, the operation and usage of this receiver will be explained using the flowchart shown in FIG. For simplicity, the reception location is Tokyo, and therefore FM Tokyo, NHK Yokohama, NHK
It is assumed that three stations in FIK Tokyo can receive the signal. First, when the power is turned on, the CPU3O starts at step [1] and becomes the input for step [2].Next, when the switch Sw is turned on, this is determined at step [3] and the CPU3O starts at step [1]. 10].

Then, at step [10], the LED 46 displays “S”.
"CAn" is displayed, then go to step [11] and set F = 0, A = AO (= initial value), and in the next step [12] the frequency 76.0 corresponding to F = 0 is displayed.
MHz (Fig. 4) reception state is reached.

Since there is no broadcasting on 76.0 MHZ in Tokyo, no signal is obtained from the detection circuit 25 in FIG. 1, but this is determined in step [13] and the process moves to step [14]. Then, at this time, since F=0 and F half is 140, the process moves further to step [15], the value of code F is incremented by 4"1" and becomes F=1, and the process goes to step [12] again. .Therefore, next step [12
], F=1, that is, the reception state is at a frequency of 76.1M. Then, F=0 to 39 (frequency 76.0 to 79
．． 9MHZ), there is no broadcasting, so the operations of steps [12] to [15] are repeated. Then, when F=40 (frequency 80.0 MHz), FM Tokyo can be received, a signal is obtained from the detection circuit 25, and this is determined in step [13], so the process moves to step [16] 6. Therefore, in step [16], as shown in FIG.
0゛ is A of RAM42. address, and then at step [17], R. Address A of AM42 is incremented by one address from address ~ to address (AO+1), and the process moves to step [14]. Thereafter, similar operations are performed, and as shown in Figure 7, FM Tokyo, NHK Yokohama, NH
K Tokyo's code F=40159, 65 is A in RAM42.

, (AO+1), (AO+2) addresses. When F=140 (frequency 90.0 MHz), the process moves from step [14] to step [18], where an end code is written to address (AO+3) of the RAM 42 as shown in FIG. 19] and move on to LE
The word "End" is lit on D46 to indicate that the detection of receivable stations has been completed.

Next, the processing of CPU3O moves to step [20] and A
= ON, and then the process moves to step 21'l where A of the RAM 42 is set.

The value of code F “゜40゛” is read from the address, and this value “゜゜40゛” is read out at step [22].
] is determined not to be the end code of step [2].
3]. Therefore, in step [23], N=0 is set, and then the process moves to step [24], where it is determined whether T(0)=F. In this case, T(0)=40,
Since the condition of step [24] is satisfied when sF=40,
Proceeding to step [25], the LEDLO is turned on, and thereafter this lighting state is maintained. Therefore, the LED indicating FM Tokyo is lit. Next, the process moves to step [26], where address A of the RAM 42 is incremented by one address from the address to become address (AO+1), and returns to step [21].

Therefore, in step [21], (A
The value of code F at address O+1) “゜59゛” is read out,
Through step [22], N=0 is set in step [23], and then T(0)=F is determined in step [24]. In this case, step T(0)=-4 with F=59. Since the condition [24] does not hold, step [27]
].

Then, in step [27], since N=31 does not hold, the process moves to step [28] and the code number N is set to N=0.
is incremented by ゜゜1゛ and set N = 1,
Stets. Go to pool [24]. Therefore, step [24]
Then, T(1)=F is determined, and in this case, T(1)=5
Since the condition λF=59 is satisfied, the process moves to step [25] where the LED L is lit and held, that is, the LED Ll indicating NI-[[<Yokohama is lit.

Then, in the same way below, the LED indicates NHK Tokyo.
2 is also lit.

In addition, in step [24], the condition should be satisfied in any one of N=0 to 31, but in step [1
If the noise signal is mistaken as a broadcast in the routines of steps 0] to 19, the condition of step 24 will no longer hold true even when N=0 to 31.

Therefore, if the condition of step [24] is not satisfied even when N=31, the process moves to step [27] and then to step [26], and the value of code F at that time is ignored. Then, in step [21], RAM4
When the end code is read from step 2, it is determined in step [22], and the process returns to step [2], where the input state is entered again.

However, in this case, the LED LO~S which indicates FM Tokyo, NHK Yokohama, and M■Tokyo is lit. So, for example, if you turn on the switch S1 corresponding to M ball Tokyo, this will be determined in step [3] and the process will proceed to step [30].
Moving on, switch S1 is N=1, so F=T(1)
= 65, and in the next step [31] F = 65
The frequency 82.5 MHz corresponding to the above will be in the receiving state, and NHK Tokyo will be received from then on.

Then, in the following step [32], the reception frequency "82.5" is displayed on the LED 46, and furthermore, in step [33], only the LED Ll is lit, and then the process returns to step [2] again and becomes the input mode. As described above, according to the present invention, receivable broadcasting stations are displayed on the map 51 in L
Since EDLN lights up and is displayed, there is no need to memorize the frequency of the car radio, and even stations whose frequencies are unknown can be easily and reliably received.

In addition, it is possible to easily select an unknown broadcasting station or a broadcasting station close to the current location or destination. Additionally, you can use the strength and weakness of radio waves to check your current location and direction of travel. In addition, it is possible to visually see where the broadcasting station is, and a sense of direction and orientation is created.

In addition, in the above description, a plurality of boards 50 may be prepared for each district and may be plug-in type into the main body.

Further, in that case, each board 50 may have a built-in ROM in which a table list (a list corresponding to FIG. 5) of broadcast stations related to that board 50 is written. Further, the tuner circuit 10 may be of a synthesizer type, or may be of wired logic instead of the CPU 3O.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of the present invention, FIGS. 2 and 3 are front views of some examples thereof, and FIGS. 4 to 7 are diagrams for explaining the same. ]0 is an electronically tuned tuner circuit, 30 is a CPU14l is a ROM142 is a RAM. ．． LO~L3l
is LED. ．． Sw, SO-S, l is a switch.

Claims (1)

[Claims] 1. A receiver that has a map and a light-emitting element installed at the location of a broadcasting station on the map, and which lights up the light-emitting element installed at the location of the broadcasting station when receiving a broadcast. .