JPS58171122A - Channel selection controller - Google Patents

Abstract

PURPOSE:To select two channels alternately with the operation of a specific key, by storing temporarily channel data just before switching in a storage means at every channel switching and reading out stored data by the operation of the specific key to select a channel. CONSTITUTION:Channel data is stored in an ROM21. When a channel designating key on a keyboard is operated, channel data corresponding to this key input is read out from the ROM21 and is stored in a current channel selection data area of an RAM22, and a channel is selected on a basis of this channel data. At this time, data stored in the current channel selection data area of the RAM22 till then is moved to an area for data before channel switching. When an exchange key on the keyboard is depressed, data in two areas of the RAM22 are exchanged, and a channel is selected on a basis of data entered to the current channel selection data area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a channel selection control device for an electronically tuned television receiver.

[Technical background of the invention]

The electronic tuning method of the tuner of a television receiver includes (a) a potentiometric 1-meter method in which the voltage supplied to the voltage variable capacitance diode of the tuning circuit is adjusted for each selected channel by setting a semi-fixed resistor;

(b) One Luteso/Inseside method in which a dedicated integrated circuit or microcomputer generates a pulse train for each selected channel, converts the pulse train into a DC voltage through a filter, and supplies it to the diode. . () Generate the control voltage of the voltage-controlled oscillator using a phase-locked Luno, insert a 7'lograma pull divider in the loop, and set the divider so that the frequency division number of this divider changes for each selected channel. A frequency-independent method is known.

In the conventional channel selection method in such an electronically tuned tuner, (a) a channel is assigned to each channel selection button, and the channel selected by the user presses the channel selection button. A method that selects only the corresponding channels. ←) In addition to the channel selection button, a! A method that has a button (or down button), and by pressing the A or G button, you can select from the currently selected channel the next channel according to the channel number order, or the adjacent channel according to the order of the selection buttons. e→Use the last channel memory function, which automatically stores the last selected channel in memory when the receiver is powered off, and reads this stored channel when the power is turned on again to perform channel selection. Other methods are known.

[Problems with background technology]

By the way, for viewers of TV programs, there are two
There are cases where the user wants to alternately KJ two programs (for example, to watch another singing program during the period of switching offense and defense in a professional baseball broadcast program). In such cases, it is necessary to repeatedly tune in to two specific channels, but in the conventional tuning method described above, the viewer has to memorize the numbers of the two selected channels. However, from the viewpoint of ease of use for viewers, it was not always completely satisfactory.

The present invention has been made in view of the above-mentioned circumstances, and provides a channel selection control device that can select the channel immediately before switching to the currently selected channel by operating a specific button (key). It is.

[Summary of the invention]

In other words, the present invention allows the memo IJK to be temporarily stored without losing the data of the previously selected channel when switching channels, and by operating a specific button on the operation section.
The temporary storage data is read out and the data is used to switch to the channel before the target switching.

As a result, two channels can be selected alternately by operating a specific button, and the viewer does not have to memorize these two channels, making the channel selection operation easier.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows, for example, a channel selection device for a frequency synthesizer type television tuner, which shows a tuner 10, a tuner control integrated circuit 11, a phase-locked loop integrated circuit 12, and a band (U) of the tuner tuning circuit.
IF, VHFll.

A band integrated circuit 13 for switching settings (VHF L, etc.), and a channel indicator 14 using a light emitting diode.
, a key gate unit 15 having various keys, a seek switch 16 for specifying channel seek scanning, a channel selection, f switch, and chi 11 for specifying channel search, channel scanning, etc. It is configured to be able to operate. And, in the present invention, the branch key? - A specific button of the code section 16 is given a specific function, and the specific button is herein referred to as an exchange button (exchange key) 18. In the control integrated circuit 11, for example, as shown in FIG.
R) A J/U 2, a buffer register 23, a control circuit 24, etc. are provided. The ROM j 1 stores channel data such as channel control circuits, and the control circuit 24 stores channels corresponding to the keys manually generated by operating the channel designation keys in the -do section 15. Data is read from the ROM 21. Further, the control circuit 24 stores the channel data read out from the ROM 21 in the current channel selection data area of the RAM 22, and stores the channel data t.
-1 Send as Iff note. In this case, the control circuit 24
R the new channel data read from OM21.
Before writing to AM J 2, the channel data currently stored in the channel selection data area is read to the buffer register 23, and this channel data is then
AM 2 2 data area before channel selection switching #. Write a new one. In addition, the control circuit j4 is configured such that when there is a key input caused by key operation of the change button 18 in the key gate section 15, the control circuit K does not read the channel data from the ROM 2J (RAM 220 for channel selection switching). The channel data stored in the data area (t)" is read into the y edge register 23, and this channel data is transferred to the RAM 22.
The current channel selection data area is stored in the current channel selection data area, and the channel selection data is sent to the phase synchronization loop integrated circuit 12 and the like. Also,
Prior to this, the channel data stored in the current channel selection data area of the RAM 22 is read into the channel register j3, and after reading the data from the pre-channel selection data area of the RAM 22, the channel data stored in the channel data area of the channel selection data area of the RAM 22 is read out. The control circuit 24 is controlled to newly write data into the above area.

Therefore, according to the channel selection device, it is possible to alternately select two channels according to the flow pressure as shown in FIG. 3, for example. That is, if, for example, channel 1 is selected and the image of channel 1 is being viewed, if channel 6 is selected, the image will be switched to channel 6. In this state, R.A.
The ``66 channel router'' is stored in the current channel selection data area of M22, and the ``1 channel'' data is stored in the data area before channel selection switching.

Next, when the replacement button 18 is operated, the data in the two areas in the RAM 2j are replaced, one channel is selected, and its image becomes visible.

When you operate the change button 18 again, RAM! The data of the above-mentioned two-headed area of 21 is exchanged, 6 channels are selected, and the image becomes K so that it can be seen.

Note that a microcomputer may be used as the control integrated circuit 11 in the above embodiment. In addition, in a channel selection device that can command the channel selection by voice, if a specific voice other than the channel command is input, the ItC
Channel switching processing similar to that when operating the specific button described above may be performed.

〔Effect of the invention〕

As described above, according to the channel selection control device of the present invention, a desired channel can be selected by using a normal channel selection button.
Furthermore, the user can select the channel immediately before switching to the current channel by operating a specific button. Therefore, it is possible to select two channels of data by operating a specific button, and the viewer does not have to memorize these two channels, making the channel selection operation easier.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing one embodiment of the channel selection control device of the present invention, FIG. 2 is a configuration explanatory diagram showing the main parts of the tuner control integrated circuit of FIG. 1, and FIG. The figure is the second
3 is a flowchart showing an example of the control operation shown in FIG. 11... Tuner control IC, 16... Key & -
Depart, 18... Alternate button, 22... RAM, 24...
・Control circuit. Applicant's Representative Patent Attorney Takehiko Suzue 111 Figure 1 14 f Figure 2 Key Figure 3

Claims (1)

[Claims] A storage means for temporarily storing channel data representing the selected channel immediately before switching each time a channel is switched by operating a channel selection button corresponding to the selected channel, and a storage means that receives a switching command by operating a specific button for channel switching. A channel selection control wheel gt characterized in that it performs channel selection switching control based on channel data stored in the storage means, and temporarily stores channel data immediately before the switching in the storage means. ', 0