JPS61189030A - Radio receiver - Google Patents

Abstract

PURPOSE:To suppress the consumption of a battery to the minimum, and also to confirm the time at the time of necessity by constituting a titled radio receiver so that the time is displayed only for a prescribed time at the time of the operation of a specified switch. CONSTITUTION:A titled radio receiver is constituted so that the power source of a display driver 15 is not supplied from the power source supply path of a radio by a relay 23 but is supplied from a display system power source supply path by a relay 24. When Recall SW is turned on, a display power source port R2 of a controller 12 becomes 'H' for a prescribed time (for instance, 5sec), and the relay 24 becomes on. At the same time, the controller 12 sets a clock display data to an output buffer, etc., and gives it to the display driver 15. As a result, when 5sec elapse, the controller 12 sets the display power source port R2 to 'L' and turns off the relay 24, and simultaneously, brings the data in the output buffer to blanking.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an in-vehicle radio receiver having a clock function that also serves as a display for displaying the reception status and for displaying the time, and particularly relates to an accessory switch. By pressing a specific switch, the time can be displayed for a certain period of time even when the watch is off.

Due to limited space in car radio receivers, the same display is often used for multiple functions.

FIG. 5 is a block diagram of an AM/FM electronically tuned radio receiver showing an example of this, in which 1 is an antenna, 2 is a high frequency section, and 3
is the receiving station source, 4 is the mixer, 5 is the intermediate frequency section, 6 is the demodulator section, 7 is the switching switch, 8 is the low frequency section, 9 is the speaker, the subscript f is for the FM system, and a is for the FM system. Indicates AM system. 1
0 is PLL (Phase Locked Loop), and the frequencies fLFM l fLA! from the receiving station are 3f and 3a. 11
(However, f LFM is reduced to 1/10 by the prescaler)
Frequency fL/N divided by frequency division ratio N and reference frequency fr
An error voltage er corresponding to the phase difference is generated from the low-pass filter 11, and is fed back to the receiving station oscillator 3, while being applied to the variable capacitance diode of the high frequency section 2 for tuning. 12 is a controller that gives this N value,
A microcomputer is used here. In addition to channel selection control, this controller 12 also controls a display 13, and one of its input sections includes a key matrix 14.

Figure 6 is an explanatory diagram of this key matrix, (al is the overall diagram. In the diagram, A, B, C, old, etc. are a total of 16 keys arranged in a matrix, and one key is Same figure (b)
As shown in the figure, it consists of a momentary switch SW and a diode D. The functions of each key are ASU: Automatic upward tuning, A
SD: Automatic downward tuning, MSU manual upward tuning, MSD: Manual downward tuning, CHI to CH5 nib reset tuning (memory tuning), WRITE: Update trigger for precent contents,
This is the oN10FF toggle operation trigger of the P0WER Niradio power supply.

1.6 (1M keys are arranged in a 4x4 matrix,
Terminal Ko-3 is connected to the input port of the controller 12, and terminals T1 to T4 are connected to the output ports. T1~T
4 is outputted at the timing shown in C1, and the switch information on the matrix is input to Ko= at each timing.

The display 513 is used for both frequency display and time display, the former displaying the distinction between AM (amplitude modulation) and FM (frequency modulation), and the latter displaying the distinction between AM (in this case, morning) and PM (afternoon). be done. A display driver 15 drives each segment of the display 13.

[Conventional technology]

FIG. 7 is a schematic flowchart of a conventional program incorporated in the controller 12, and FIG. 8 is a block diagram summarizing FIG. 5 including the power supply system. In Figure 8,
20 is a radio body (tuner section) including the high frequency section 2 to low frequency section 8 shown in Fig. 5; 21 is a 5V regulator that constantly supplies backup power Vdd from battery B to the controller 12;
Does the accessory power supply to the controller 12 occur while the cSW) 30 is on? A voltage conversion unit 23 that supplies jMAcc converts the battery voltage B to the radio body 20 while the switch 30 is on.
and a power control relay that supplies the display driver 15 with i
is an input end, 0 is an output end, and C is a control end. The controller 12 sends segment and digit control signals to the display driver 15 to control the display of the display 13 (in this example, each 4-digit number is displayed using 7 segment elements), and also controls the control terminal C of the relay 23. A radio ON control signal is sent from port R1 to control the relay 23 to be turned on only while the Acc switch 3o is on.

Specifically, as shown in Fig. 7, in the case of Acc 5WON, the power switch of the radio is POWER15W.
(The radio power is controlled according to the on/off status in Fig. 6 (al A), and each key accepts human power, but the Acc
In the case of SW OFF, ■Turn off the radio ON control signal given to the control terminal C of the relay 23, and ■Blank all the display data given to the display driver 15.
In addition, ■ all key functions in key matrix 14 are treated as invalid.

[Problem that the invention seeks to solve]

If the Acc switch 30 is turned off due to the above factors (■ to ■), the display on the display 13 will disappear, so even if you try to check the time afterwards, it will be impossible (the time itself is counted in the controller 12). ). In order to improve this point, power to the display 13 should always be supplied from a path unrelated to the Ace Sui Nochi 30, and time data should always be output from the controller 12. This will increase the consumption of battery B (and cause the battery to run out).

The present invention is designed so that even during the Ace switch off period, only manual key input by a specific switch can be accepted, and the time is displayed only for a certain period of time when the specific switch is operated, thereby minimizing battery consumption. This allows you to check the time at any time.

[Means for solving problems]

FIG. 1 is a block diagram of the principle of the present invention, and (a) shows when the display is an LED (light emitting diode) or a fluorescent display tube;
(b) is a case where the display device is an LCD (liquid crystal). The controller 12 outputs a radio ON control signal from port R1 to control a power supply control relay 23 that energizes the radio and PLL circuit.
4, it is possible to temporarily display the time on the display even when the AccSW is off. However, in the case of fa), relay 2
4 supplies power to the display driver from battery B, and in this case, the controller 12 is connected to another port R2.
A display control output is output from the relay 24 to control the relay 24. On the other hand, in the case of (bl), it is assumed that the controller 12 has a built-in LCD drive circuit.

In this case, the relay 24 is the lamp 2 for illuminating the LCD pack.
5, and the radio ON control output of port R1 can also be used as the control signal.

[Effect]

1 (a) (b) In either case, when the relay 24 is turned on, the display becomes possible to display, but the controller 12 does not turn on the relay 24 until a specific switch (for example, one of the key matrices) is pressed. Only turn it on for a certain amount of time. Therefore, even if the specific switch is intentionally pressed for a long time or is kept in the on state due to a malfunction, it is possible to avoid hafting. Then, the controller 12 outputs time data and displays a clock only during the certain period of time.

〔Example〕

The second tooth is a block diagram showing an embodiment of the present invention, in terms of hardware, a relay 24 is added to the configuration shown in FIG. The power is taken from the display system power supply path by the relay 24 provided. This is Figure 1ia)
This is the case. Figure 3 shows the controller 12 in this case.
This is an explanatory diagram of the software, (a) is a flowchart,
(b) is a time chart. In the flowchart for fa), the area within the dashed line frame is the same as the conventional method in Figure 7, but
The difference is after branching to N (No) in the cSW○N judgment process. The Recall SW is a specific switch (referred to as a recall switch) for temporarily displaying a clock when the AccSW is off, and corresponds to the X key in FIG. 6 (al).

When this Recall SW is turned on, the display power supply port R2 of the controller 12 becomes "H" for a certain period of time (for example, 5 seconds) as shown in FIG. is set on an output sofa, etc., and given to the display driver 15. As a result, the display 13 displays a clock for only 5 seconds, for example.When 5 seconds have elapsed, the controller 12 sets the display power port R2 to "L". The relay 24 is turned off, and at the same time, the data in the output sofa is blanked.

Fig. 4 shows the detailed flow of each part, (al is Acc OFF processing. This processing
e is the branch destination of N (no) for SW ON, and among these, "display power supply port "L"output" is a step added according to the present invention. Figure 4 (bl is the AccON process that is the opposite of this, Figure 3 fa)
c This is the branch destination of Y (yes) for SW ON. However, in the present invention, a step of "display power supply port "H"output" is inserted before proceeding to this AccON process. This is because relays 23 and 24 are separated. FIG. 4(C) shows Recall S-processing, which is the branch destination Y of Recall SW ON in FIG. This process is for displaying the clock priority and temporarily displaying the frequency when the AccSW is turned on.
Following cOFF processing <Recall SW This is different from ON (shared the same key X). Figure 4 (d
l is P OWE R8W processing, which is key A in Figure 6.
It is related to. In other words, as shown in FIG. 7, the details of the process are to turn off the radio when the POWERSW is turned on when the radio is turned on, and to turn on the radio if the radio is turned on. Note that when the AccSW is on and the radio is off, the clock is displayed continuously (the 7th clock).
(see figure).

When the display device 13 is an LCD, by making the controller 12 a built-in display driver, similar control can be performed using only the output port R1 of the controller 12, as shown in FIG. 1(b). In other words, if Recall SW is pressed while Acc SW is off, controller 1
2 sets the output port R1 to "H" and turns on the relay 24 for a certain period of time. Since the lamp 25 is now turned on, the LCD display 13 is driven by the output (driver output) of the controller 12, and the time is displayed. At this time, the relay 23 is also turned on, but since the human power i is the Acc power supply (turned off by the switch 30), there is no problem in that power is supplied to the radio and the PLL circuit at the same time as this display operation.

〔Effect of the invention〕

As described above, according to the present invention, in an in-vehicle radio receiver having a clock function, when a specific switch is turned on even when the accessory switch is off, the clock is displayed, so it is possible to check the time even when the driver is not present. Moreover, since the display changes for a certain period of time, it has the advantage of minimizing battery consumption.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram showing an embodiment of the invention, Figs. 3 and 4 are flow charts of the entire operation and each part, and Fig. 5 is a P
A block diagram showing an example of a LL electronically tuned radio receiver,
FIG. 6 is an explanatory diagram of the key matrix, FIG. 7 is a flowchart showing the operation of a conventional controller, and FIG. 8 is a block diagram showing conventional power supply control. In the figure, 12 is a controller, r3 is a display, 14 is a key matrix, 15 is a display driver, 20 is a radio main unit,
23 and 24 are power supply route relays, 25 is an LCD backlight lamp, 30 is an accessory switch, B is a battery,
X is a specific switch. Applicant Fujitsu Ten Ltd. Representative Patent Attorney Minoru Aoyagi (d) ACCOFF Processing (b) Acc CN! % Theory Figure 4 (C) Recal SW t& Reason ω> FoN
ERswag Hiiragigoto → Ya flow + dirt Figure 4 Ko Kl K2 K3
(t)) (C) °T5゛arrow - 1L 6th death of matrix - - - - - - - - - - - - - + j + + + + ++
++ -''Nera-'s Radio Savings 1 Station's Telephone Bone, No. 14, Figure 8 Procedural Amendment (Spontaneous) November 1, 1985 1, Indication of Case 1985 Patent Application No. 27984 2, Name of the invention: Radio receiver 3, relationship to the case of the person making the amendment Patent applicant address: 1-2-28 Gosho-dori, Hyogo-ku, Kobe, Hyogo Prefecture Name: Fujitsu Ten Ltd. Representative: Sho Funabashi 4, Agent: 101 5. Date of amendment order None 6. Number of inventions increased by amendment None 8. Contents of amendment (1) Change "Automatic upward selection" on page 3, line 12 of the specification to "Automatic upward selection"'K' correction. (2) Correct "clock" on page 10, line 13 of the same page to "time".

Claims (1)

[Claims] A microcomputer backed up by a battery is used as a controller for controlling the radio main body and the display, and the reception status is displayed on the display during the ON period of an accessory switch interposed in the power supply path from the battery to the radio main body. In an in-vehicle radio receiver that displays a clock, a display system power supply path is provided that can supply power directly from the battery to the display system under the control of the controller,
The controller is characterized by having a program that turns on the display system power supply path for a certain period of time when a specific switch input is received during the off period of the accessory switch, and outputs time data to the display. An in-vehicle radio receiver with a clock function.