JPS5819190B2 - Television receiver channel selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a channel selection device for a television receiver, and particularly to a channel selection device for a television receiver.
The present invention relates to a channel selection device for a television receiver that can simultaneously display television images of two channels.

2. Description of the Related Art Television receivers that simultaneously display television images of a plurality of channels using a plurality of tuners and picture tubes are well known.

Furthermore, a television receiver that simultaneously displays images of two main and sub channels on one television screen was immediately proposed in Japanese Patent Application No. 47-39273 (Japanese Unexamined Patent Publication No. 49-2419). There is.

However, such television receivers usually require separate dedicated channel selection switches for main channel selection and sub channel selection.

The present invention has been made especially in view of these points,
In a television receiver that can simultaneously receive television signals from two main and sub channels and display two images at the same time, the main and sub television images can be switched arbitrarily and can also be used as a channel selection switch. The purpose of this invention is to provide a channel selection device that can be operated to select a channel.

. The present invention will be described below according to embodiments shown in the drawings.

The drawing shows a configuration diagram of one embodiment of the present invention, where 11 is a channel selection operation unit having nine channel selection switches 1 to 9 and one channel exchange switch 10, and 12 is a channel selection operation unit having a 4-bit memory element. Similarly, the main channel memory device 13 is a sub-channel memory device consisting of a 4-pit memory element, 14 is an OR gate, 15 is a delay circuit, 16 is a flip-flop, 1
7.18 is a decoder, 19. 29 is a main channel receiving tuner, 29 is a sub channel receiving tuner, 21 is a flip-flop, and 22.23 is a main/sub switching circuit.

The main channel receiving tuner 19 and the sub channel receiving tuner 20 are both provided with preset volumes VR1 to VR so that each of the nine desired channels can be arbitrarily received in correspondence with the channel selection switches 1 to 9.
9 and VR1' to VR0' are provided, and a tuning voltage corresponding to each channel is preset by each volume.

Further, the channels received by both tuners 19 and 20 are displayed by channel display lamps L1' to L1.

Various operating methods and circuit operations in the above embodiment will now be explained in order.

First, when switching the main channel image, that is, the channel being received by the main channel reception tuner 19, select the desired channel selection switch 1 of the channel selection operation section 11.
When one of the switches .about.9 is turned on, channel selection information code-converted according to the switch is simultaneously supplied to the storage devices 12 and 13.

This tuning information may be, for example, "0001" when switch 1 is on, and "0010" when switch 2 is on.
Similarly, when the switch 9 is turned on, information ``1001J'' is supplied.

At this time, both flip-flops 16.21 are in the reset state, and the outputs of both flip-flops 16.21 are "L" and the outputs are "H&I", so only the main channel storage device 12 receives the above channel selection information. However, the channel selection information is not input to the sub-channel storage device 13, and the previously stored information is maintained as it is.

At this time, the information stored in the main channel storage device 12 is supplied to the decoder 17 via the main/sub switching circuit 22, and the information corresponding to the turning on of the intermediate selection switches 1 to 9 at the output end of the deep 17 is specified. Only one output becomes “G”.

Therefore, at this time, in the main channel reception tuner 19, one switching transistor Q, ~Q, corresponding to the above-mentioned specific output is turned on, and accordingly, the pair.

The tuning voltage set by the corresponding preset volume TR, 1 to TR9 is the main channel tuning gate voltage Cv.
As a result, the tuner 19 for receiving the main channel
Then, this specific channel becomes the receiving state.

If you simply operate the channel selection switches 1 to 9 in this way,
The channel selection information is always input and stored in the main channel storage device 12, and the channel based on the channel selection information stored in the storage device 12 is in the reception state by the main channel reception tuner 19.

On the other hand. In the sub channel reception tuner 20, since the tuning information previously stored in the storage device 13 is supplied to the decoder 18 via the main/sub switching circuit 23, the channel corresponding to this tuning information is always selected. It is in the receiving state.

Now, if you want to exchange the two main and sub television images, turn the channel exchange switch 10 of the channel selection operation section 11 on and off twice in succession, and the flip-flop 16 will be reversed. Flip-flop 2 due to operation
1 is also reversed, and the output of the flip-flop 21 is returned to "H", so that the channel selection information stored in the main channel storage device 12 at this time is transferred to the main/sub switching circuit. 23 to the decoder 18, and the channel selection information stored in the sub channel storage device 13 is also supplied to the decoder 17 via the other main/sub switching circuit 22. As a result, both tuners 19 and 20 The receiving channels are swapped with each other.

If the channel exchange switch 10 is turned on and off twice in succession, the operation of the flip-flop 21 is reversed, and the receiving channels of the tuners 19 and 20 are returned to the original channels.

Furthermore, when the main and sub television images have been exchanged as described above, if the channel selection switches 1 to 9 are turned on, the channel selection information of this switch is input and stored in the disgusting channel storage device 12. However, at this time, the OR gate 14 is opened, and the gate output is supplied to the reset terminal of the flip-flop 21 after a slight time delay via the delay circuit 15, and the flip-flop 21 is reset. When main channel reception tuner 1
9, the newly selected channel is received, while the subchannel receiving tuner 20 receives the original channel.

Next, if you want to switch the channel being received by the sub-channel reception tuner 20, first turn on the channel exchange switch 10 of the channel selection operation section 11, and then turn on the desired channel selection switches 1 to 9. If you turn it on,
At this time, the operation of the flip-flop 16 is first inverted, and the output of the flip-flop 16 is inverted to "I(, 1i"), so that the output of the flip-flop 16 is inverted to "L".
The channel selection information code-converted in response to the turning on of the channel number 9 is input to the sub-channel storage device 13 and stored therein.

On the other hand, at this time, the channel selection information is not input to the main channel storage device 12, and the storage device 12 stores the previous information as it is, and the main channel reception tuner 19 continues to receive the previous channel.

Therefore, at this time, the channel selection information stored in the sub channel storage device 13 is supplied to the decoder 18 via the main/sub switching circuit 23, and the output terminals of the decoder 18 One specific output corresponding to ON becomes "H".

Accordingly, in the sub-channel receiving tuner 20, switching transistors Ql' to Q9' correspond to this output.
is turned on, and the preset volume vR1 to ■R9
A tuning voltage set to ' is applied to the sub-channel tuning diode C, and as a result, the desired channel is received.

As described above, when selecting a secondary channel, the channel selection operation section 11
channel exchange switch 10 and desired channel selection switch 1
By turning on channels .about.9 once in sequence, the channel selection information is input and stored in the sub-channel storage device 13, and the desired channel is received by the sub-channel receiving tuner 20. When channels 1 to 9 are turned on, the OR gate is opened, and the flip-flop 16 is reset by the slightly delayed pulse of this gate output, so if you simply turn on the channel selection switches 1 to 9, this channel selection information will be transferred to the main channel. The information is input and stored in the storage device 12, and at this time the main channel is selected.

According to the channel selection device of the present invention, in a television receiver capable of simultaneously receiving television signals of two main and sub channels and displaying two images simultaneously as described above,
In particular, it has two storage devices 12 and 13 for storing tuning information from the tuning switches 1 to 9, a channel exchange switch 10 and main/sub switching circuits 22 and 23 for appropriately exchanging the tuning information of both storage devices. Therefore, when desired, the two receiving channels, the main and sub channels, can be exchanged with each other with a simple switch operation, and of course, they can be switched back again.

At this time, it is also possible to individually select the two main and sub channels using the same channel selection switches 1 to 9.

[Brief explanation of the drawing]

The drawing shows a configuration diagram of one embodiment of the channel selection device of the present invention. 1 to 9...Tuning selection switch, 10...Channel exchange switch, 11...Tuning selection operation section,
12... Main channel storage device, 13...
...Subchannel storage device, 16, 21...Flip-flop, 17°18...Decoder, 1
9... Main channel reception tuner, 20...
... Subchannel reception tuner, 22, 23.
...Main/sub switching circuit.

Claims (1)

[Claims] A television receiver capable of receiving television signals of 12 channels and displaying these two television images at the same time includes a plurality of channel selection switches, a channel exchange switch, and storage of channel selection information by the channel selection switches. a first (main) and a second (sub) channel storage means for storing the channel information, and a tuning information means for supplying the tuning information stored in each of the storage means to the first and second tuners, respectively; main/sub switching means for mutually switching the main and sub channel selection information supplied to each tuner according to the operation of the channel exchange switch; A channel selection device for a television receiver, characterized in that it can be changed.