JPS6115628B2 - - Google Patents

Description

Detailed Description of the Invention The present invention allows one cathode ray tube to be used for one screen, two screens, four screens, etc.
This relates to a channel selection device that can be used by switching to a screen, and provides a channel selection device that can obtain various channel selection states by providing three switches in addition to a normal channel selection switch. This is what I am trying to do.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows one example of this, and the tuning device is a well-known preset volume type tuning device using a counter and a decoder, and a preset volume for extracting the tuning voltage. Assuming that this channel selection device is capable of selecting 12 stations, the reset signal sets the channel selection position to 1, and the channel selection position changes to 1 by the up signal CHu.
tsutsuup. If an up signal is received when 12 positions are being received, 1 position will be received.

Tuning circuits 1, 2, 3, and 4 are the aforementioned preset volume type tuning circuits;
7 and 8 are receiving circuits including tuners, which are controlled by respective tuning circuits. 9 is a distributor,
The RF signal from the antenna 10 is distributed and guided to the RF input terminal of each receiving circuit.

11 is a channel selection switch, channels 1 to 12 are direct channel selection switches, A is a 4-screen switch, B is a 2-screen switch, C is a replacement switch, D
is a release switch.

12 is a controller for controlling the channel selection circuits 1, 2, 3, and 4, and is a microcomputer.

Now, if you close channel 1 of the direct channel selection switch, the channel discrimination means 2 in the controller 12
3, it is determined that channel 1 selection has been instructed, and the reset pulse generating means 24 and channel up pulse generating means 25 are controlled to generate the reset output Reset and channel up output CHu shown in FIG. 2a.
1. Output CHu2, CHu3, CHu4. In this case, the reset signal Reset is input to the tuning circuit 1, but the channel up signal CHu1 is not output, so that the first position is selected. The channel selection circuit 2 is
Reset signal Reset and channel up signal
Since CHu2 enters once, the second position is selected. Similarly, the third position is selected for the channel selection circuit 3, and the fourth position is selected for the channel selection circuit 4.

Even when the channel selection keys from 2ch to 12ch are closed, the same position as the channel selection key is selected for the channel selection circuit 1,
In the channel selection circuits 2, 3, and 4, the larger positions are selected one by one. The respective waveforms in this case are shown in FIG. 2 b, c, d, e, f, g, h, i, j, k, and l. As is clear here, when the tuning circuit 1 is in the 10th position, the tuning circuit 2 is in the 11th position,
Tuning circuit 3 is at the 12th position, and tuning circuit 4 is at the 1st position.
A position is selected. That is, the 12th position is the maximum, and the next position after the maximum position is also selected from the first position.

As explained here, only one set of tuning switches can select four tuning circuits.

The video signals output from the receiving circuits 5, 6, 7, and 8 are applied to a changeover switch 13. This changeover switch 1
3 extracts four inputs and stores them in the memory 14, as shown in FIG. 3c, and reads them out to display four screens on the cathode ray tube 15, or outputs the signals from the receiving circuit 5 as shown in FIG. 3b. , the signals from the receiving circuit 6 are stored in the memory 16, read out and transmitted to the cathode ray tube 15.
It is used to switch between displaying two screens on the display, or outputting one screen from the output of the receiving circuit 5 to the cathode ray tube 15 as shown in FIG. 3a. This changeover switch 1
3 is composed of a logic circuit as shown in FIG. 4, for example. This switching is performed by output signals a, b, and c from the memory 17.

Signals from switches A, B, C, and D are applied to a detection circuit 18 in the controller 12 to detect whether switch A, B, C, or D has been pressed. When A is pressed, the fact is stored in memory 17, output a is output, and the outputs of receiving circuits 5, 6, 7, and 8 are stored in memory 1.
4. Change the changeover switch 13 so that it enters 4. A
A signal A indicating that has been pressed is also applied to the comparator circuit 19. At this time, the tuning circuits 1, 2, 3, 4
1 channel, 2 channel, 3 channel,
When channel 4 is selected, cathode ray tube 15
The four screens shown in FIG. 3c are obtained. Next, when the A switch is pressed again, the detection circuit 18
is detected and compared with the previous A in the comparison circuit 19,
The channel up pulse generating means 25 is controlled to apply four pulses to all the channel selection circuits 1, 2, 3, and 4. As a result, the four screens in Figure 3c are 5, 6,
I will be selecting channels 7 and 8. From now on A
Each time you press the switch, the 4 screens change by 4 channels.

Next, when switch B is pressed in this state, B is detected by the detection circuit 18 and B is stored in the memory 17. Then, an output is output to b, and the selector switch 13 applies the outputs of the image receiving circuits 1 and 2 directly to the cathode ray tube 15 through the path 20 and the memory 16, and outputs the output to the cathode ray tube 15 as shown in FIG.
The two screens shown are obtained. Since the comparison circuit 19 compares A and B, no output is produced. Next, when switch B is pressed again, B is compared with the previous B in the comparison circuit 19, and the comparison signal is used to output only to the image receiving circuit 2, changing only channel 2 of the small screen in Figure 3b to channel 3. do. Thereafter, each time switch B is pressed, the channel on the small screen shown in FIG. 3b increases by one.

With the channels 1 and 2 displayed as shown in Figure 3b, switch C
When is pressed, the detection circuit 18 detects C,
The memory content B of the memory 17 changes to C.
When the stored content of the memory 17 reaches C, a signal obtained by comparing C with the previous stored content B is applied to the changeover switch 13 through the c line, and the output of the receiving circuit 5 is transferred to the memory 16. , the output of the receiving circuit 6 is switched directly to the path 20. As a result, the state of the screen shown in FIG. 3b is switched.

In addition, when switch C is pressed in the screen state shown in FIG.
Added to 3 and 4. As a result, the state of the screen shown in FIG. 3C becomes 2 to 5 channels.

When switch D is pressed, D is stored in the memory 17, output is output to D, and the output of the image receiving circuit 5 is directly applied to the cathode ray tube 15 through the path 21, resulting in one screen as shown in FIG. 3A. When switch C is pressed in the state of one screen, C and D are compared in a comparator circuit, and one pulse is applied to channel selection circuit 1 so that channel 2 is selected.

Even if the screen state is as shown in FIGS. 3B and 3C, when the switches 1ch to 12ch are pressed, D is stored in the memory 17 through the path 22, and the screen state becomes one screen. Therefore, switch 1ch can be used without intentionally providing switch D.

As described above, according to the present invention, by simply providing one set of channel switches and three switches A, B, and C, it is possible to realize 1-screen, 2-screen, and 4-screen states, including channel forwarding operations. It is.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a channel selection device in an embodiment of the present invention, Fig. 2 a, b, c, d, e, f,
g, h, i, j, k, l are waveform diagrams for explaining the device, Fig. 3 a, b, c are plan views showing the state of the screen of the device, and Fig. 4 is the changeover switch 13. FIG. 11...Tuning switch, 12...Controller, 1, 2, 3, 4...Tuning selection circuit, 5, 6, 7,
8... Receiving circuit, 13... Selector switch, 14,
16, 17...Memory, 15...Cathode ray tube, 2
0, 21... Direct path, 19... Comparison circuit, 18
...Detection circuit, A, B, C...Switch.

Claims (1)

[Claims] 1 four receiving circuits including tuners; four tuning circuits that apply tuning voltage to these receiving circuits and control the number of channels to increase by one each time one pulse is applied; A changeover switch that uses the outputs of the four receiving circuits as input signals to display one, two, or four screens on the cathode ray tube screen, multiple direct channel selection switches, a four-screen switch, and a two-screen switch. By operating any one of the channel selection switch, which has a switch, exchange switch, and release switch, and the above-mentioned direct channel selection switch, a different number of pulses are applied to each of the four channel selection circuits to select a different channel. Control to tune, 4 screen switch,
By operating the 2-screen switch and release switch, the changeover switch is controlled to display 4 screens, 2 screens, and 1 screen on the cathode ray tube screen, and by operating the changeover switch, the changeover switch is controlled to display 4 screens, 2 screens, and 1 screen. A channel selection device characterized by comprising: a controller that controls to change the time screen and send one channel when 4 screens are displayed.