JPS63309018A - Channel selecting device - Google Patents

Abstract

PURPOSE:To use a band selection key as a display key and to eliminate the need for a special display part for a channel in reception or a receivable channel by displaying channel selection information of a selected band at a video reproduction part when a band selection key is operated. CONSTITUTION:This device has a television tuner part, a radio tuner part, the television image playback part, and band selection keys 41TV, 41FM, and 41AM for selecting television bands and radio bands, and when the band selection keys 41TV, 41FM, or 41AM are operated, the channel selection information of the selected band is displayed at the video display part. Consequently, the band selection keys can be used as channel selection display keys to decrease the number of keys, improve the operability, and use the video playback part as a display part for channel selection information, so another display part is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a channel selection device capable of receiving multiple bands of television broadcasting, FM radio broadcasting, AM radio broadcasting, and the like.

[Summary of the invention]

This invention is a system in which a TV band and a radio band can be selected by switching between them using a band selection key, and when the band selection key is operated, channel information for the selected band is displayed on the video playback section of the television. This has the advantage that the band selection key is also used as a display key and that no special display section is required to display the selected channel that is being received or is receivable.

[Conventional technology]

2. Description of the Related Art Conventionally, a channel selection system is known in which the channel can be selected by selectively switching between television broadcast, FM radio broadcast, and AM radio broadcast using a band selection key.

As this type of channel selection system, a frequency synthesizer type channel selection device has recently been generally used.

This frequency synthesizer type tuning device has a PLL circuit equipped with a variable frequency dividing circuit in the local oscillation circuit, and performs tuning by adjusting the frequency division ratio of the variable frequency dividing circuit according to the desired channel. .

Generally, a manual up/down key or an auto search key for sequentially changing the frequency division ratio is provided as a channel selection key, and the channel selection operation is performed using these keys.

In addition to sequential tuning, it is also possible to store (preset) the frequency division ratio corresponding to the desired channel in memory corresponding to a preset tuning key, and then operate the preset tuning key. This also allows you to select the desired channel with one touch.

By the way, since the above-mentioned channel selection device needs to display channel selection information indicating which channel of which band is currently being selected, conventionally, the device specifically includes a display section for displaying this channel selection information.

A display key for displaying the channel selection information on the channel selection information display section is generally provided separately from the band selection key and the like.

[Problem that the invention seeks to solve]

However, providing separate display keys as described above increases the number of operation keys, which poses a problem of key installation space and complicates operation.

Furthermore, providing a special display section has disadvantages in terms of space and cost.

[Means for solving problems]

In this invention, the band selection key is also used as a display key, and the video reproduction section of the television is used as the display section.

[Effect]

When the band selection key is operated, channel information of the selected band is displayed on the video playback section.

〔Example〕

Hereinafter, an embodiment of the present invention will be described as an integrated tuning system having a cathode ray tube for video reproduction and capable of receiving television signals, FM and AM radio broadcasting signals, and particularly as a tuning system for use in a vehicle. A suitable case will be explained as an example.

Figure 1 is the overall block diagram of this channel selection system, +1
1 is the TV tuner section, (2) is the FM tuner section, (3
) is an AM tuner section, which is a frequency synthesizer type tuner. (4) is a system controller (hereinafter referred to as a system controller) that controls the entire system, and the system controller (4) is equipped with a microcomputer. In addition, the system controller (4) has each tuner section f.
t) (21(3)) It has a memory that stores frequency division ratio information as the tuning information to be supplied to the local oscillation circuit, and the frequency division ratio is read from this memory by the tuning key and the tuning is performed. The system controller (4) also has a memory that stores tuning information that is preset in correspondence with a preset tuning key that will be described later.

This system controller (4) sends a band selection signal to the TV tuner section (1), FM tuner section (2), and AM tuner section (3) through the pass line to select one of the TV, FM, and AM bands. and channel selection information are supplied.゛(5) is a cathode ray tube as a video reproduction section. This video playback section can also use a liquid crystal display.

(6FL) (6FR) is a front speaker installed in front of the driver or on the front door, (6RL
) (6RR) is a rear speaker installed at the rear, (
7FL ) (7FR) (7RL ) (7RR)
is an audio amplifier.

For example, 10B is a 12V car battery power supply, and (8T
V') (8FM > (8AM) is a power control switch circuit that is switched by a switching signal from the system controller (4) in accordance with switching of the reception band of TV band, FM band, and AM band. Also, (8AP
) is the power supply to the audio amplifier (7F!, ) (V
FR) (7R1, > (7RR). This switch circuit (8AP) supplies the system controller (4AP) when the system power key of this tuning system is turned on.
) is turned on by a switching signal from ).

In this case, since this channel selection system is installed in a vehicle, diversity reception is performed. That is, (9A) (9B) (9C) (9D) are receiving antennas, and the output of the antenna (9A) is supplied to the antenna selector (11) via the distributor (lO), and the output of the antenna (9B) (9C) (90
) is supplied to this antenna selector (11). This antenna selector (11) selects an antenna based on a control signal from the system controller (4).

The output of this antenna selector (11) is sent to a distributor (12)
TV tuner section (fl) and FM tuner section (2)
It is distributed to Further, the output of the antenna (9A) distributed by the distribution W (10) is supplied to the AM tuner i f3).

The TV tuner section (1) provides composite video signal output and main channel and sub channel audio signal output (when equipped with an audio multiplex decoder), and the FM tuner section (2) provides left and right channel audio. A signal output is obtained, and a one-channel audio signal output is obtained from the AM tuner section (3).

A video signal output from the television tuner section (1) is supplied to a switch circuit (13). On the other hand, a video signal from an external video input terminal (14v) ill, for example, a video output terminal of a VTR, is supplied to this switch circuit (13). This switch circuit (13) is selectively switched by a video input switching signal from the system controller (4).

The video signal from this switch circuit (13) is supplied to the Y/C signal processing circuit (15), where the composite video signal is converted into R, G, B33 original signals, and the color tone is adjusted by the hue volume (16). Along with the adjustment, color adjustment is also performed using the color volume (17).

The three primary color signals from this signal processing circuit (15) are sent to the amplifier (
18) to the switch circuit (19). Further, three primary color signals from external R, G, B input terminals (20) are supplied to this switch circuit (19). This switch circuit (19) is selectively switched by an R, G, B input switching signal from the system controller (4). For example, map information or the like can be input as the three primary color signals from the R, G, B input terminals (20).

The three-color signal from this switch circuit (19) is supplied to a switch circuit (21). On the other hand, a character generator (30) is provided, and a character signal and a switching signal YS are obtained from the generator (30) in response to a control signal from the system controller (4), and these are supplied to the switch circuit (21).

The switch circuit (21) is switched pixel by pixel by the switch signal YS, so that the image based on the character signal from the generator (30) is superimposed on the screen with respect to the signal from the switch circuit (19). It is made possible. Switch circuit (
19), only the character image is displayed.

The three primary color signals from the switch circuit (21) are supplied to the cathode of the cathode ray tube (5) via the output amplification circuit (22), and an image is displayed on the screen. A brightness control signal from the system controller (4) is supplied to the output amplifier circuit (22) via the D/A converter (23), and the brightness of the image displayed on the cathode ray tube (4) is controlled. .

On the other hand, TV tuner section (11), FM tuner section (2)
The audio output from the AM tuner section (3) is supplied to a switch circuit (24). Further, an audio signal from, for example, an audio output terminal of a VTR via an external audio input terminal (15A) is supplied to this switch circuit (24). Then, the switch circuit (24) is switched according to reception band selection and external input switching by a switching control signal from the system controller (4). A two-channel audio signal is obtained from this switch circuit (24), and the audio signal of each channel is supplied to the front speakers (6FL) and (6FR) through the front amplifier (7FL) and (7FR), respectively, and the rear amplifier ( The signal is supplied to the rear speakers (61?L) and (61?!?) through 7RL) and (7RR), and the audio is reproduced. Here, a volume control signal is supplied from the system controller (4) to the front amplifier (7F1.) and (VFR) via the D/A converter (25), and the front amplifier (7F1.) and (VFR)
) playback volume is controlled. In addition, the rear amplifier (7RL
A volume (26) is provided for each of the rear speakers (6RL) and (6RR), and by adjusting this volume, the reproduction volume of the rear speakers (6RL) and (6RR) is adjusted.

(40) is the control panel section with various keys, volume (16) (17) (26) and buzzer (
27) etc. are arranged.

(4M) is a last memory that stores the last channel selection information such as the receiving band and channel when the system power key is turned off.

FIG. 2 shows an example of the arrangement of keys, etc. on this control panel section (40), all of which are tact keys. In the same figure, (41TV) (41FM)
(41AM) are TV band, FM band, A
A band selection key for selecting the M band, (42) a manual tuning key, and (43) an automatic tuning key. The manual channel selection key (42) can sequentially increase or decrease the receiving frequency only while being pressed. When the automatic channel selection key (43) is pressed, the user searches for a channel that is broadcasting and stops the search operation at the receiving frequency.

(44) is the front amplifier (7FL) and (VFR)
The front volume adjustment key (45) is a system power key which forms a volume control signal to be supplied to the system.The system power key (45) turns on and off the power to the entire system.

(26shiR) is the heir to adjust the rear volume (26),
Although not shown in FIG. 1, (46) and (47) are adjustment knobs for tone control, respectively.

In addition, <16VR) and (17VR) are rotating parts for adjusting the hue volume (16) and color volume (17), (13SW) is a push button switch for switching the switch circuit (13), and (15AJ) and (15VJ
) are jacks that serve as input terminals (15A) and (15V) for external audio signals and external video signals.

(48) is a brightness key for forming a brightness control signal, and (49) is a buzzer that produces a click sound when a key is operated or a completion sound when precenting is completed, which will be described later.

(50A') (50B)... (50F) are preset tuning keys, and in this example, corresponding to these preset tuning keys (50A) to (50F), TV, FM.

Six stations can be preset in each AM band.

The channel selection operation in this channel selection system can be performed as follows.

First, when you turn on the system power key (45), the switch circuit (8AP) is turned on and the amplifier (7F) is turned on.
+, ) (7RL) (7RR) is turned on, and tuning information such as the last band and last channel is read out from the last memory (4M), and the tuning system is activated by pressing the system power key (45). The channel will be in the same state as when it was previously turned off. At this time, the currently selected channel information, band, etc. are displayed on the screen of the cathode ray tube (5) serving as the video reproduction section.

From this state, hand selection key (41TV) (41F
If you press one of M) (41AM) to switch bands, the tuner section of the selected new band will be selected, and the tuning system will be in the tuning state of the last channel of that band, which will be described later. The channel selection information is displayed on the cathode ray tube (5).

And preset tuning key (50^) ~ (50F)
When one of these buttons is pressed, the channel selected in accordance with the preset selection key pressed in that band is selected, and the display of the current receiving channel on the cathode ray tube (5) changes.

Of course, the channel selection can also be changed using the manual selection key (42) or the automatic selection key (43).

Next, the band selection key (41TV) (41FM)
(41AM) will be described below.

FIG. 3 is a flowchart at that time, which is executed by the microcomputer of the system controller (4).

That is, as shown in Fig. 3, the band selection key (4
1TV) (41FM) (41AM) is turned on, it is determined in step (101) whether the system power is turned on, and if it is not turned on, the process proceeds to step (102). After turning on the system power regardless of the system power key (45), the process proceeds to step (103).

At this time, the band selection key also functions as a system power key. If it is determined in step (101) that the system power is on, the process immediately proceeds to step (103).

In step (103), the last mode of the last memory (4M) is changed in accordance with the operated band selection key, and this is read out. Next, proceed to Ste Knob (104) and band selection is performed according to the last mode read from memory (4M), i.e., hand 'M'.
The tuner section for the band selected by the tR key is selected. Next, the process proceeds to step (105), where the read last channel selection information is given to the selected tuner unit, and the last channel is selected. next,
Proceeding to step (106), a control signal corresponding to the last mode is sent to the character generator (3o) to the system controller (4o).
) and this character generator (3o)
, a character signal and display switching signal YS that displays the band, recent channel, currently received channel, etc.
is output and displayed on the screen of the cathode ray tube (5).

Note that when the selection key for the band currently being received is turned on, information on the channel currently being received is displayed on both sides.

An example of the display on the screen at this time is shown in FIG.

This is an example of the display when the FM band selection key (41FM) is pressed.The last channel (currently receiving channel)
Information is displayed in the upper right part of the screen, and the characters "FM" are displayed in the upper left part of the screen, and presets are preset in the left half of the screen corresponding to the preset channel selection keys (50^) to (50F). Channel information is displayed. The volume is displayed as a bar at the bottom of the screen.

When the A or M band selection key (41^M) is pressed, the selected channel information is similarly displayed on both sides of the cathode ray tube (5) as shown in FIG.

Note that when the FM band and AM band are selected, the channel selection information as shown in FIGS. 4 and 5 can be displayed at all times on the screen of the cathode ray tube (5). In that case, the channel selection information on the top right of both sides is displayed using the selection key (42) (
43) and (50A') to (50F).

Further, when the TV band selection key (41TV) is pressed, the channel selection information is displayed in a superimposed state on the TV image as shown in FIG. 6, and disappears after, for example, 5 seconds have elapsed.

Also, for example, V from the external video input terminal (14V)
When the reproduced signal from the TR is reproduced on the screen of the cathode ray tube (5), or when map information from the R, G, B input terminals (20) is displayed on the screen of the cathode ray tube (5). , band selection key (41TV) (41FM)
When one of (41^M) is pressed, the last mode channel selection information of the band selected by the pressed band selection key is displayed on the screen in superimpose mode, and disappears after, for example, 5 seconds have elapsed.

FIG. 7 shows an example of the display when the television band selection key (41TV) is pressed while the map information image from the R, G, B input terminals (20) is being displayed on the cathode ray tube (5).

In addition, the band display of 'TV', 'FM', 'AM',
The currently received channel display, precent channel display, volume display, etc. can be displayed in different colors to make them easier to see visually.

Furthermore, although the above is a case of a frequency synthesizer type tuning device, the present invention is not limited to this, and can also be applied to a voltage control type or other electronic tuning type tuning device.

[Effects of the Invention] As described above, according to the present invention, when a band selection key is operated, the channel selection information of the band selected by the band selection key is displayed on the video playback section. The key can also be used as a selected channel display key, reducing the number of keys and improving operability.

Furthermore, since the video playback section also serves as a display section for selected channel information, there is an advantage that a separate display section is not required.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a channel selection system using this invention, FIG. 2 is a diagram showing an example of arrangement of the control I/roll panel section, and FIG. 3 is a diagram for explaining the invention in detail. The flowcharts, FIGS. 4, 5, 6, and 7 are diagrams showing examples of displays on the tube surface of a cathode ray tube as an example of a video reproduction section. (11 is the TV tuner section, (2) is the FM tuner section,
(3) is AM tuner section, (4) is system controller, (5) is hidden line tube, (41TV) (41FM)
and (41AM) are band selection keys, and (30) is a character generator.

Claims (1)

[Claims] It has a TV tuner section, a radio tuner section, a TV video playback section, and a band selection key for selecting each of the TV band and radio band, and when the band selection key is operated, the selected band is tuned. A channel selection device that displays channel information on the video playback section.