JPS6062722A - Channel selection device of television receiver - Google Patents

Abstract

PURPOSE:To read alternately the contents of both of a channel selection channel memory and a preset memory by the operation of a call switch by providing the channel selection channel memory and the preset channel memory storing single preset channel information. CONSTITUTION:When a channel selection switch 1 is operated, it is stored in the channel selection channel memory 3. Moreover, the content of the memory 3 is stored in the preset channel memory 15 via a gate 18. The contents of the memories 3 and 15 are applied respectively to a decoder 8 via gates 7 and 13, and one of turning voltage setting variable resistors 10 is selected by the output of the decoder 8. An FF23 is inverted by the operation of the call switch 12 and one of the gates 7 and 13 is activated by the output of the FF23.

Description

[Detailed description of the invention] The present invention relates to a channel selection device for a television receiver.

While watching a program on a certain channel on a television receiver, there are times when the program is temporarily switched to a program on another specific channel, such as a baseball broadcast, and the user wants to know the progress of the program.

In this case, with conventional television receivers, it is necessary to switch to the desired channel each time and then return to the original channel.

In particular, in the case of a television receiver that changes channels sequentially in an up-down manner, if the channel you are currently watching and the channel you temporarily want to watch are not adjacent to each other, you will need to perform multiple channel selection operations. This channel selection operation was quite troublesome.

The present invention has been made in view of these points, and it is an object of the present invention to provide a television receiver that is extremely convenient for users.

Furthermore, the present invention provides a channel selection device for a television receiver that can temporarily call and receive a desired channel by performing a simple operation while watching a program on a certain channel. .

The present invention will be described below according to embodiments shown in the drawings. 1st
The figure shows one embodiment of the present invention in a block diagram, where 1 is a tuning switch group consisting of N tuning switches, 2 is an encoder, and 3 is a tuning channel memory. When any one of the channel selection switches 11, 12, . The selected channel signal is derived, and is supplied to the selected channel memory 3 and stored therein. The channel selection information stored in the channel memory 3 is displayed by the channel selection switch 11 +12.
Each time . That is, a remote control channel selection signal emitted from a remote control signal transmitter (not shown) is received by the remote control signal receiver 4, and is applied to the signal discrimination circuit 5 where it is discriminated as an up or down signal and the channel is determined. Supplied to memory 3. Therefore, in the channel memory 3, the code contents are counted up or down one by one each time the up-down signal is supplied.

The selected channel information obtained from the channel memory 3 is applied to a channel display decoder 6 and also via an AND gate group 7 to a channel selection decoder 8. Therefore, at this time, one of the light emitting diodes 91+92, . On the other hand, a variable resistor 101 * 102 + . . . for setting a tuning voltage based on the output of the decoder 8 for tuning.
A predetermined tuning voltage is derived from a specific variable resistor in 10n, and this is applied to the electronic tuning tuner 1 via a diode.
1, and as a result, a predetermined channel is selectively received. Since a voltage of
Each AND gate is always open, and the selected channel information in the channel memory 3 is directly supplied to the channel selection decoder 8 via the AND gate group 7, and the selected channel at this time is always in the receiving state. ing.

However, now the preset channel call switch 12
When the flip-flop 23 is turned on and off, the operation of the flip-flop 23 is reversed, and at this time, the Q output of the flip-flop 23 goes to the 'L' (zero voltage) level, while the same output goes to the 'H# level. As a result, each gate of the AND gate group 7 is closed, and conversely, each gate of the AND gate group 13 is opened. Therefore, at this time, the preset channel information previously stored in the preset channel memory 15 is The information is supplied to the channel selection decoder 8 in place of the station channel information, and the preset channel becomes in the receiving state.

Thereafter, when the call switch 12 is turned on and off again, the operation of the flip-flop 12 is reversed again, and the Q output of the flip-flop 12 returns to the H'H" level, while the Q output returns to the IL" level. The gate is opened again, while each gate of the AND gate group 13 is closed, and as a result, the selected channel information in the selected channel memory 3 is supplied to the selected channel decoder 8, and the original selected channel is received again. That will happen.

In this way, by repeating the on/off operation of the call switch 12, the selected channel and the preset channel are received alternately.
If a call switch similar to the above is provided on the remote control transmitter side, and the call signal derived to the signal discrimination circuit 5 when the switch is turned on is supplied to the flip-flop 23 as shown by the broken line, the remote control It is also possible to easily call and receive a preset channel by simply turning on and off a call switch on the transmitter side.

Note that the preset channel memory 15 has a 4-bit memory element like the channel selection channel memory 3, and then the preset channel memory 15 has a 4-bit memory element.
This section explains how to store preset channel information in memory.

First, in the same way as when operating a channel, turn on the channel selection switch corresponding to the desired channel in the channel selection switch group 1, store the channel information in the channel selection memory 3, and then store the channel information in the channel memory 3 in this state. When the switch 16 is turned on, the one-shot multivibrator 17 is driven by the negative pulse shown in FIG. 2(a) generated at this time, and the multivibrator 17 generates a positive polarity pulse as shown in FIG. A one-shot pulse is generated and applied to one input terminal of each gate of AND gate group 18, thereby opening each gate.

At this time, the one-shot pulse of the opposite polarity obtained from the one-shot multivibrator 17 is applied to the delayed pulse generation circuit 19, and the delayed pulse as shown in FIG. 20
The signal is supplied to the preset channel memory 15 via the preset channel memory 15. Therefore, the moment this delayed pulse is added to the preset channel memory 15, the channel information obtained from the channel memory 3 is stored in the preset channel memory 15 as is. Once the channel information is stored in the preset channel memory 15, each gate in the AND gate group 18 remains closed unless the memory switch 16 is turned on again.
The channel information in the channel selection memory 3 is not input, and at this time, the information stored in the preset channel memory 15 is stored and held as is as preset channel information. At this time, the preset channel information is constantly supplied to the preset channel display decoder 21, and based on this, the preset channel display light emitting diodes 221. 222 . . . 22n enters a light emitting state, thereby displaying the preset channel.

Note that here, the preset channel display light emitting diode 221. If, for example, green light emitting diodes are used for 222...22n, and red light emitting diodes are used for the light emitting diodes 91+92...9n for displaying the selected channel, it is possible to distinguish between the selected channel and the preset channel. is possible.

According to the channel selection device of the present invention, a preset channel memory that stores specific preset channel information is provided separately from the channel selection channel memory that stores information on the channel selected by the channel selection switch as described above, and in particular, a call switch When on/off operation, this preset channel can be called and received regardless of the selected channel.

Therefore, in a television receiver using the channel selection device of the present invention, if you want to occasionally watch programs on other channels while watching one program, you can preset this channel in advance and call it up when desired. By simply turning on and off the switch, the user can very easily call and receive the channel and then return to the original program, which is very convenient for the user.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the channel selection device of the present invention,
FIG. 2 is a diagram of signal waveforms at various parts in the same embodiment. 1... Tuning switch group, 3... Tuning channel memory, 7.13... AND gate group, 12...
Call switch, 15...Preset channel memory, 23...Flip-flop.

Claims (1)

[Claims] 1. A television receiver that converts selected channel information stored in a selected channel memory into a corresponding tuning voltage using a tuning switch, supplies the same to an electronic tuning tuner, and receives the selected channel. In the channel selection device of the machine, the device comprises: a call switch; a preset channel memory that stores single preset channel information independently of the channel selection information; a flip-flop driven by an on/off operation of the call switch; A gate circuit is provided which alternately derives the selected channel information and preset channel information by the output of a flip-flop, and the preset channel is called and received by the first on/off operation of the calling switch, and the original selected channel is returned by the second on/off operation. A channel selection device for a television receiver, characterized in that the channel is received again. 2. The channel selection device for a television receiver according to claim 1, wherein the call switch is provided on the side of a remote control signal transmitter, and a preset channel can be called and received by remote control operation.