JPS59230330A - Public broadcast receiver for vehicle - Google Patents

Abstract

PURPOSE:To avoid the misrecognition of broadcast stations by displaying the broadcasting area names in addition to the broadcast station names under a tuning state. CONSTITUTION:A receiver applies a PLL synthesizer system, and a microcomputer is used for the tuning control, the display control, etc. A front panel contains an area selection switch 14a of a momentary type to which the broadcasting area is set in response to the switch depressing frequency in addition to various types of switches. A character display device 2a shows the corresponding broadcasting area as well as the characters equivalent to the broadcast station.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a public broadcasting (for example, radio broadcasting) receiver for vehicles, and in particular, the present invention relates to a public broadcasting (for example, radio broadcasting) receiver for a vehicle, and in particular, it can display the name of the broadcasting station that is currently being tuned to, and the broadcasting area that is currently being set. The present invention relates to a vehicle public broadcasting receiver that can display both images.

The present applicant previously proposed a vehicle radio receiver in Japanese Patent Application Laid-Open No. 58-62922 that prevents erroneous display of broadcast station names even if there are multiple broadcast stations using the same frequency in each broadcast area. are doing.

FIG. 1 shows an example of the front panel of such a radio receiver. As shown in the figure, on the front panel 1 there are character displays 2. Numerical display 3, band selection switch 4, 5. Channel selection switches 6-9. Memory switch 10. Up switch 11. Down switch 12.
An auto switch 13 and an area selection switch 14 are provided, respectively.

Each of the switches 4 to 13 is a momentary type switch, and the area selection switch 14 is a digital switch.

Then, after setting the area selection switch 14 to the area number corresponding to the broadcasting area (for example, Kanto) in which the vehicle is currently driving, synchronization with any broadcasting frequency is achieved by the preset mode, manual search mode, or auto search mode. The character display 2 displays characters corresponding to the name of the currently tuned broadcasting station according to the broadcasting area set by the area selection switch 14, and the numerical display 3 displays the currently tuned broadcasting frequency. is displayed.

However, in such conventional radio receivers, whether or not the broadcasting station name displayed on the character display 2 accurately corresponds to the currently tuned broadcasting frequency is determined by setting the area selection switch 14. This cannot be determined unless the area number is confirmed, which requires a cumbersome confirmation operation for drivers who are driving.In addition, if the vehicle moves between adjacent broadcast areas, it is difficult to determine whether the broadcast area There are problems such as it is easy to forget to reset the settings.

(Objective of the Invention) The object of the invention is to display the currently set broadcasting area clearly to drivers etc. in this type of receiver, thereby preventing misidentification of the broadcasting station being tuned. There is a particular thing.

(Structure of the Invention) In order to achieve the above object, the present invention displays characters corresponding to the name of the broadcasting station being tuned together with characters corresponding to the name of the set broadcasting area.

(Description of Embodiment) FIG. 2 shows an example of the front panel of the receiver according to the present invention.The difference from the conventional example shown in FIG. 1 is that the dot-type display constituting the character display 2a The display capacity has been increased so that both the broadcasting area name and the broadcasting station name can be displayed, and the area selection switch 14a is a momentary type switch, so that the broadcasting area is set according to the number of times it is suppressed. There is a particular thing.

FIG. 3 is a block diagram schematically showing the configuration of the electric circuit of the receiver. This receiver is configured using a PLL synthesizer method, and tuning control, display control, etc. are performed by a microcomputer. .

That is, as is well known, the high frequency received by the antenna 15 is tuned and amplified in a radio frequency amplification stage (hereinafter referred to as RF) 16, then converted to an intermediate frequency in a mixing stage (hereinafter referred to as MIX) 17, and then further Frequency amplification stage (hereinafter referred to as
(1) The broadcast signal is selectively amplified in a detection stage (hereinafter referred to as DET) 19, and then taken out through a detection stage (hereinafter referred to as DET) 19.

In addition, in the same figure, AM detection is indicated as DET19.

Display including both FM detection.

A local oscillation frequency signal supplied to the MIX 17 is provided by a phase locked loop (hereinafter referred to as PLL) 20. As is well known, the PLL 20 is a voltage controlled variable frequency oscillator (hereinafter referred to as ■C) that outputs a local oscillation signal.
) 201, a prescaler 202 that divides the output of this VCO 201 at a predetermined frequency division ratio, a variable frequency divider 203 that further divides the output of this prescaler 202 into 1/N, and this variable frequency divider An opening 5 corresponding to the phase difference between the output of the crystal oscillator 203 and the output of the crystal oscillator 204 - A phase detector (hereinafter referred to as PD) 20 that generates gummy pressure
5, and by the output of this PD205, the VC
The oscillation frequency of O201 is locked.

The frequency division ratio of the variable frequency divider 203 is given by the microcomputer 21, and by appropriately controlling the value of this frequency division ratio in the preset mode, manual search mode, and auto search mode, which will be described later, it is possible to perform arbitrary broadcasting. It is possible to synchronize with the frequency.

The AM tuning detection circuit 22 and the FM tuning detection circuit 23 each output 11111 when each band is tuned, and based on this "1" output, the microcomputer 2
1 detects the tuning state in each broadcast band.

The front panel of the operating section 24 has the configuration shown in FIG. 2 described above, and the outputs of the switches 4 to 14a are respectively input to the microcomputer 21 via interfaces (not shown).

Further, the numerical display 3 is driven by the tuning frequency data detected by the microcomputer 21, and the dot type display 2a is driven by the broadcasting area name data and broadcasting station name data, which will be described later, via the well-known video RAM 25. is driven.

Next, the microcomputer 2 in manual search mode, preset mode and auto search mode
1 will be explained with reference to the flowcharts shown in FIGS. 4 to 6.

In the manual search mode, when the up switch 11 provided on the front panel 1 in FIG. 2 is continuously pressed, steps (401)→(4,02)→( 403) → (405
)→(406)→(4,01) are repeatedly executed, and the content of the tuning frequency register N provided in the working RAM increases by ΔN at the end of the minute time interval Δ, and this is the PL
By sequentially applying the signal to the variable frequency divider 203 of L20, the tuning frequency changes by minute units ΔF.

In addition, in this state, if the upper limit of the broadcast frequency band has been reached, step (404) is executed following execution of step (403).
) is executed and the content of the tuning frequency register N is NMIN
is reset, and up-search starts again from the lower limit of the broadcast frequency band.

On the other hand, the down switch 1 on the front panel 1
If 2 is pressed, step (4) is performed in the same way.
01) → (407) → (408) → (409) → (41
1)→(412)→(401) are repeatedly executed, thereby performing a down search.

If the lower limit of the broadcast frequency band has been reached, step (410) is executed following execution of step (409), and up-search from the upper limit of the broadcast frequency band is performed again.

And up switch 11. When any presses on the down switch 12 are released, the program ends without performing anything.

As a result, when the above-mentioned up-search or down-search is performed and each switch is released when tuning is achieved with any broadcast station, the value of the tuned frequency register N will change to the corresponding tuned frequency. is held at the corresponding value,
The value of this tuning frequency register is used in the broadcasting station name display process described later.

Next, the operation in the preset mode will be explained based on the flowchart shown in FIG. Note that the broadcast station memory processing performed prior to the preset mode will be omitted.

When any of the channel switches 6 to 9 is operated on the front panel 1 of FIG. 2, steps (501) and (502) are sequentially executed in the flowchart of FIG. 5, and the channel of the operated switch is Detected.

Then, step (503) is executed according to each detected channel CH1 to CH4, and the tuning frequency data stored in the corresponding channel is stored in the tuning frequency register N.
Then, upon execution of step (504), the signal is output to the variable frequency divider 203 forming the PLL 20.

As a result, as soon as a channel button is pressed, tuning to the broadcasting frequency corresponding to the tuning frequency data stored in the channel is immediately performed.

In this way, even in the preset mode, when tuning is achieved with a broadcasting station stored in any channel, the contents of the tuning frequency register N become a value corresponding to the frequency being tuned, and the content of the tuning frequency register N becomes the value corresponding to the frequency being tuned. The value of this tuning frequency register is used in the name display process.

Next, the operation of the auto search mode will be explained with reference to the flowchart shown in FIG. When the auto switch 13 is momentarily pressed on the front panel 1 of FIG. 2, in the flowchart of FIG. 6, steps (601) →
(602) → (603) → (604) → (605) → (
601) or (606) → (607) → (608) →
Any one of (609)→(610)→(606) is repeatedly executed, thereby automatically performing an up search or a down search.

In addition, if the upper or lower limit of the broadcast frequency band is reached during the up search or down search, the execution result of step <602) or (606) becomes YES, and the up search is started from the down search. Switching control is automatically performed from up search to down search.

Next, in this state, the ΔM tuning detection circuit 22 shown in FIG.
Alternatively, if tuning with any broadcast frequency is detected based on the output of the FM tuning detection circuit 23, step (60
When the execution result of 5) or <610) becomes YES, the auto search operation automatically ends.

In this state, when the tuning is achieved with any broadcast frequency, the content of the tuning frequency register N is held at the value corresponding to the tuning frequency, and the broadcasting station name display processing described later is performed in the same way as described above. This value is then used.

Next, the operation of the broadcast area setting process will be explained based on the flowchart of FIG. When the area selection switch 1111a provided on the front panel in FIG. 2 is depressed, the flowchart in FIG. The contents are updated one by one. Additionally, when the contents of the area code register reach the maximum M^×, the contents of the area code register are transferred to step (7).
02) and (703).

The contents of this area code register Δ are used in broadcasting station name display and broadcasting area name display processing, which will be described later.

Next, we will change the operation of displaying the broadcasting station name and broadcasting area name in the 8th section.
This will be explained with reference to the flowchart shown in the figure. First, in step (801), the contents of area code register A shown in the flowchart of FIG. 7 are read.

Next, in step (802), data is stored in the ROM of the microcomputer 21 based on the contents of the area code A read in the previous step and the value of the tuning frequency data N formed in the reception processing of each mode. The broadcasting station name code BC8 specified by the area code A and the tuned frequency data N is determined by referring to the table shown in FIG.

Next, in step (803), as shown in FIG.
In each area name display dot data area in ROM,
The display dot data for the 11th to 1st positions are read from the first address AD+, AD2, . . . of the broadcast area name specified by the area code, and transferred to the video RAM 25. Then, due to the action of the video RAM 25,
As shown in FIG. 2, the dot-type display 2a displays the name of the broadcasting area corresponding to the area code, such as "Kando".

Next, in step (804), as shown in FIG.
In the broadcasting station name display dot data area provided in the ROM, the corresponding broadcasting station name display dot data is extracted from the start address AC++, AD+2, etc. of the broadcasting station name specified by the broadcasting station name code BC8. Read only one unit,
This is similarly transferred to the video RAM 25.

Then, due to the action of the video RAM 25, the name of the broadcasting station is displayed on the character display 2a as shown in FIG. The characters and the characters corresponding to the broadcasting station name will be displayed together.

According to the above configuration, the characters corresponding to the set broadcasting area name are always displayed on the character display 2a together with the characters corresponding to the tuned broadcasting station name. The set broadcast area name can be clearly confirmed from the display 2a without checking the setting state of the area selection switch.

Furthermore, in this embodiment, the broadcast area selection switch 14a
Since a momentary type switch is used as the switch, and the broadcast area name is set sequentially depending on the number of times the switch is pressed, the character display 2a can also be used to set the broadcast area.
All you have to do is simply repeat the pressing operation while looking at the driver, and you can easily do this without having to look away from the front while driving.

° In the above embodiment, the broadcasting station name and broadcasting area 14
-Although the names were displayed in alphabets and katakana, it goes without saying that in order to display them in kanji, all you need to do is change the dot pattern in the ROM.

Further, in the above embodiment, the dot matrix display method was used for the broadcast area name, but the point is that it is sufficient as long as the broadcast station name and the broadcast area name are displayed together, so as shown in FIG. , each broadcast area can be displayed by printing or forming the required number of characters on the display panel with through-hole slits, etc., and lighting the lamps placed on the back side of each character as appropriate. good.

In particular, in the example shown in Figure 14, we avoid duplication of the kanji names required for display, such as Kanto, Tokai, and Kansai.

It is possible to display the 10 areas of Chugoku, Shikoku, Kyushu, Tohoku, Hokkaido, Hokuriku, and Chubu with 13 characters. With this configuration, the display area can be significantly reduced and the display can be made more compact. It contributes to

(Effects of the Invention) According to the present invention, in this type of receiver, the name of the frequency being tuned and the name of the set broadcast area can be confirmed simultaneously from one display, and therefore Even when the names of broadcasting stations in different broadcasting areas are displayed, there is an effect that this can be immediately discovered.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the configuration of the front panel of a conventional receiver, FIG. 2 is a front view showing the configuration of the front panel of the receiver according to the present invention, and FIG. 3 is a front view showing the configuration of the front panel of the receiver according to the present invention. A block diagram showing the electrical configuration, FIG. 4 is a flowchart showing operation in manual search mode, FIG. 5 is a flowchart showing operation in preset mode, FIG. 6 is a flowchart showing operation in auto search mode, and FIG. 7 9 is a flowchart showing details of the broadcast area setting process, FIG. 9 is a diagram showing the contents of a broadcasting station name code calculation table using area code and tuning frequency data as parameters,
Figure 0 shows a table for calculating the start address of the factory display data based on the area code, and Figure 11 shows a table for calculating the start address of the broadcast station name display data based on the broadcast station name code (X indicates Figure 12 is a memory map showing the storage area of area name display dot data.
FIG. 3 is a memory map showing a storage area for broadcasting station name display dot data, and FIG. 14 is a diagram showing another example of a broadcasting area name display section. 2a...Character display 14a...Area selection switch 25...Video RAM Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] (1) Frequency detection means for detecting the currently tuned broadcasting frequency; Area setting means for setting the currently running broadcasting area: The relationship between each broadcasting frequency and the corresponding broadcasting station name is determined for each broadcasting area. storage means for storing the broadcast station names in the memory; and selection means for selecting one specified by the detected broadcasting frequency and the set broadcasting area from among the stored broadcasting station names; and: the selected broadcasting station name. 1. A public broadcasting receiver for a vehicle, comprising display means for displaying characters corresponding to a station name together with characters corresponding to the set broadcasting area name.