JPS6329475B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a channel selection device that displays images of multiple channels at once, and aims to reduce the number of channel selection switches and provide an easy-to-operate channel selection device. It is.

When projecting four different channel images on a cathode ray tube screen using a conventional channel selection device, four sets of channel selection switches 1, 4, 7,
10, channel selection device 2, 5, 8, 11, tuner 3,
Requires 6,9,12. This device requires a large number of channel selection switch devices, which causes confusion and is not practical. Therefore, the present invention aims to improve operability by reducing the number of channel selection switches, and embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an 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 one channel up signal (CHU) raises the channel selection position by one. If an up signal is received when 12 positions are being received, 1 position will be received.

The channel selection devices 13, 14, 15, and 16 are the aforementioned preset volume type channel selection circuits;
Tuners 7, 18, 19, and 20 are controlled by respective tuning circuits. 21 is a distributor that distributes the RF signals from the unlaner 22 and guides them to the RF input terminals of the respective tuners.

23 is a channel selection switch, 1ch to 12 are switches for direct channel selection, 1up is a switch to advance channel positions one by one, and nup switch is a switch to advance channel positions one by one. . 19 is a controller for controlling the channel selection circuits 33, 34, 35, and 36, and is a microcomputer.

Now, if you close channel 1 of the direct tuning switch, the reset output (Reset) and channel up output (CHU1, CHU2,
CHU3, CHU4) are output. In this case, the reset signal (Reset) is input to the tuning circuit 13, but the channel up signal CHU1 is not output.
The position is selected. The tuning circuit 14 receives a reset signal (Reset) and a channel up signal.
Since CHU2 enters once, the second position is selected. Similarly, the tuning circuit 15 is in the third position,
The fourth position of the channel selection circuit 16 is selected.

Even when the channel selection keys of 2ch to 12ch are closed, the same position as the channel selection key is selected in the channel selection circuit 13, and the larger positions are selected one by one in the channel selection circuits 14, 15, and 16. The respective waveforms in this case are shown in Fig. 3 b, c, d, e, f, g, h, i and Fig. 6 j, k, l. As is clear here, the tuning circuit 14 is in the 11th position, and the tuning circuit 15 is in the 11th position.
12 positions, the first position of the channel selection circuit 16 is selected. That is, the 12th position is the maximum,
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. Next, I will explain about the up key. There are two types of up keys: the 1up key and the nup key.

The 1up key is used to raise the channel position one position at a time. Close the direct channel selection key 1 now and set the channel selection circuit 13 to the first position, the channel selection circuit 14 to the second position, and select the channel position. The station circuit 15 is in the third position, and the channel selection circuit 16 is in the fourth position.
If you close the 1up key while selecting a position, the tuning circuit 13 becomes the second position, the tuning circuit 14 the third position, the tuning circuit 15 the fourth position, and the tuning circuit 16 the fifth position. .
At this time, the reset signal (Reset) from the controller 24 and the channel up signal have the waveforms shown in FIG. 3b. That is, it outputs a reset signal for selecting the next position of the channel up signal and a reset signal for selecting the next position of the channel up signal that were output when the channel was selected before closing the 1up key.

Also, when you close the nup key, in this case there are 4 channel selection devices, so if you press the 4up key,
Assuming that the tuning circuit 13 is in the first position, the tuning circuit 14 is in the second position, the tuning circuit 15 is in the third position, and the tuning circuit 16 is in the fourth position, when the 4up key is closed, The reset signal and channel up signal have the waveform shown in e of FIG. 3, and the tuning circuit 13 is in the fifth position.
The channel selection circuit 14 selects the 6th position, the channel selection circuit 15 selects the 7th position, and the channel selection circuit 16 selects the 8th position.The channel selection circuit 14 selects the 6th position, and the channel selection circuit 16 selects the 8th position.The channel selection circuit 16 selects the channel position plus n positions (4 positions in the specific example). Similarly, each of the other channel selection circuits selects a channel position in which n positions are added. However, since 12 positions is the maximum, if this added value exceeds 12, 12 positions will be calculated from this added value.
Each person assumes the position they drew. Waveform diagram also 4up
When the key is closed, the following four waveforms, which should be received before closing the 4up key, are output from the controller 19 as reset, channel up signals.

This controller 19 is a microcomputer, and all input/output control is performed by software processing.

Further, position display control signals for indicating each channel position are 25, 26, 27,
This is done using reset signals 28 and 29 and a channel up signal.

As is clear from the above, it is possible to select the same channel for all four channels very easily.

In this way, the number of input/output lines is extremely small, and the number of channel selection keys is n (4 in the specific example).
It is possible to select different channels at one time using the same tuning circuit. Also, when combined with the memory and D/A conversion circuit, the channel selection circuits 13, 14, 15,
It goes without saying that 16 can also be included in the controller 19.

The screen display may be explained using four cathode ray tubes, or the screen of one cathode ray tube may be divided into four.

As described above, according to the present invention, since the number of channel selection switches can be reduced, it is possible to provide a channel selection device with good operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional channel selection device, FIG. 2 is a block diagram of a channel selection device according to an embodiment of the present invention, and FIG. 3 is a, b, c, d, e,
f, g, h, i, j, k, l are waveform diagrams for explaining the same device. 13, 14, 15, 16... Channel selection device, 17,
18, 19, 20...Tuner, 21...Distributor, 22...Antenna, 23...Tuning switch,
24...Controller, 1ch to 12ch...Direct channel selection switch, 1up, nup...Switch.

Claims (1)

[Scope of Claims] 1. A plurality of tuners that receive television signals, and a plurality of tuners provided in each of these tuners,
A plurality of tuning circuits are controlled so that one channel is sent when one pulse is input, one tuning switch has one set of channel switches, and the above-mentioned multiple channels are transmitted by switch operation of this tuning switch. A controller that sends control signals to the tuning circuit of the tuner, and a display section that displays the outputs of the plurality of tuners on the screen, and by pressing the switch of any channel in the tuning switch, each channel is different from the controller. What is claimed is: 1. A channel selection device that generates a plurality of control signals each having a number of pulses, and controls the plurality of channel selection circuits using these control signals. 2. The channel selection device according to claim 1, characterized in that the channel selection switch is provided with a 1-up switch that controls the controller to apply one pulse to all of the plurality of channel selection circuits. 3. The channel selection device according to claim 1, characterized in that the channel selection switch is provided with a nup switch that controls the controller to apply a plurality of pulses to all of the plurality of channel selection circuits.