JPH0452007B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to an electronic channel selection device used in color television receivers and the like. BACKGROUND OF THE INVENTION In conventional electronic tuning devices equipped with video input circuits, changing the video state and changing the channel operate independently of each other. An electronic channel selection device equipped with a conventional video input circuit will be described below with reference to the drawings. First, FIG. 2 is a block diagram of a conventional electronic channel selection device. In FIG. 2, 15 is a channel data storage circuit that stores channel tuning voltage data, and 14 is a tuning voltage that generates a tuning voltage corresponding to the data by inputting the current channel data read from the channel data storage circuit 15. a generation circuit, 16 a channel data temporary storage circuit for temporarily storing the current channel data read out from the channel data storage circuit 15;
17 is a video data storage circuit that stores video data; 18 is a video switching output circuit that outputs the video data of the video data storage circuit 17 as a video state switching output; 13 is a video switching input that outputs the video data of the video data storage circuit 17; A video switching circuit 11 for rewriting video data stores the current channel data read out from the channel data storage circuit 15 in the channel data temporary storage circuit 16 as the previous channel data by the channel switching input, and stores the new channel data as the current channel data. A channel switching circuit 12 stores the previous channel data in the channel data temporary storage circuit 16 and the current channel data in the channel data storage circuit 15 alternately by means of a channel switching input. This is a channel switching control circuit. The operation of the conventional channel selection device configured as described above will be described below.

[Table] First, Table 1 shows the channel data storage circuit 15.
(i.e., the channel contents output from the tuning voltage generation circuit 14), the storage contents of the channel data temporary storage circuit 16, and the storage contents of the video data storage circuit 17 (i.e., the video state output from the video switching output circuit 18). ) represents the state transition that changes depending on the channel switching input, video switching input, and channel switching input. When three channels are input to the channel switching input in step 1, the channel data storage circuit 15
The memory content of will be "3". When "Video 2" is input to the video switching input in step 2, the stored content of the video data storage circuit 17 becomes "Video 2". When 5 channels are input to the channel switching input in step 3, the channel data storage circuit 15
The stored content of the channel data temporary storage circuit 16 becomes "5", and the stored content of the channel data temporary storage circuit 16 becomes "3". When "television" is input to the video switching input in step 4, the stored content of the video data storage circuit 17 becomes "television". At this time, channel 5 is selected, and the video status is "TV".
It is becoming. Next, when channel replacement is input in step 5, the memory content of the channel data storage circuit 15 becomes "3", and the channel data temporary storage circuit 1
The memory content of 6 becomes "5". At this time, the video status remains "TV". Next, if there is a channel exchange input in step 6, the state will be exactly the same as in step 4. Problems to be Solved by the Invention However, in the above operation, in order to watch 3 channels and Video 2 alternately, for example, it was necessary to input "TV" and "Video 2" to the video switching input. . On the other hand, the channel swap function is a function that alternately swaps the previous channel and the current channel, and in the sense that the image seen on the cathode ray tube of the television receiver changes, channel swapping and video switching are not the same. They changed similarly and required different operations to perform similar functions. In order to solve the above-mentioned problems, the present invention provides a device having a function of switching the video state when channel switching is input. Means for Solving the Problems In order to solve the above problems, the electronic channel selection device of the present invention is provided with a video data temporary storage circuit that temporarily stores the video state of the video data storage circuit, and the video data It has a configuration that discriminates between the memory contents of the temporary memory circuit and the memory contents of the video data memory circuit, and automatically determines whether to exchange channel data or video data based on a channel exchange input. It is something. Effects The present invention, with the above-described configuration, stores the state of the previous video in the video data temporary storage circuit, and stores the stored content of the video data temporary storage circuit (that is, the previous video state) and the video data storage circuit. It compares and judges the memory contents of the circuit (that is, the current video state), and for example, when both are in the TV state, the channel data is interchanged using the channel switching input, and when both are not in the TV state, the channel data is switched using the channel switching input. By switching the video data, the channel switching input causes the screen to switch to the previous state. Embodiment An electronic channel selection device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an electronic channel selection device according to an embodiment of the present invention. In FIG. 1, 6 is a channel data storage circuit that stores channel tuning voltage data, and 5 is a channel data storage circuit that receives current channel data read from the channel data storage circuit 6 to generate a tuning voltage corresponding to the data. 7 is a channel data temporary storage circuit that temporarily stores the current channel data read from the channel data storage circuit 6; 9 is a video data storage circuit that stores the video state; 10 is the video data storage circuit 9; 8 is a video data temporary storage circuit that temporarily stores the current video data read out from the video data storage circuit 9; 3 is a video data storage circuit that outputs video data by switching the video data; A video switching circuit stores the current video data read from 9 in the video data temporary storage circuit 8 as previous video data, and stores the new video data in the video data storage circuit 9 as current video data; 1 is connected to the channel switching input; Therefore, channel data storage circuit 6
The current channel data read from is stored in the channel data temporary storage circuit 7 as the previous channel data, and the new channel data is stored as the current channel in the channel data storage circuit 6.
2 is a channel switching circuit that stores "TV" in the video data temporary storage circuit 8 only when the storage content of the video data storage circuit 9 is "TV"; The previous channel data in the temporary storage circuit 7 and the current channel data in the channel data storage circuit 6 are alternately exchanged and stored (b) The previous video data in the video data temporary storage circuit 8 and the current video data in the video data storage circuit 9 are alternately stored. A channel switching control circuit 4 controls which one of the above (a), This is a determination circuit that determines which control is to be performed in (b). The operation of the electronic channel selection device configured as described above will be explained below.

【table】

[Table] Table 2 shows the storage contents of the channel data storage circuit 6 (that is, the channel contents output from the tuning voltage output circuit 5), the storage contents of the channel data temporary storage circuit 7, and the storage contents of the video data storage circuit 9 ( In other words, the video state output from the video switching output circuit 10) and the storage contents of the video data temporary storage circuit 8 represent state transitions that change depending on the channel switching input, the video switching input, and the channel switching input. be. In step 1, set “Video 2” to the video switching input.
When this is input, the stored content of the video data storage circuit 9 becomes "Video 2". When three channels are input to the channel switching input in step 2, the stored content of the channel data storage circuit 6 becomes "3". When 5 channels are input to the channel switching input in step 3, the channel data storage circuit 6
The stored content of the channel data temporary storage circuit 7 becomes "5", and the stored content of the channel data temporary storage circuit 7 becomes "3". When "television" is input to the video switching input in step 4, the stored content of the video data storage circuit 9 becomes "television", and the stored content of the video data temporary storage circuit 8 becomes "video 2". When channel swapping is input in step 5, the discrimination circuit 4 discriminates between the storage contents of the video data storage circuit 9 and the storage contents of the video data temporary storage circuit 8, and since they are different, the storage contents are exchanged with each other. The storage content of the video data temporary storage circuit 8 becomes "TV" and the storage content of the video data storage circuit 9 becomes "Video 2." At this time, "Video 2" is displayed on the screen. When channel swapping is similarly input in step 6, the stored contents of the video data storage circuit 9 and the stored contents of the video data temporary storage circuit 8 are swapped as in step 5, and the 5 channels of the TV are displayed on the screen. There is. The situation at this time is exactly the same as in step 4. Next, in step 7, when channel 7 is input to the channel switching input, the storage content of the channel data storage circuit 6 becomes "7", the storage content of the channel data temporary storage circuit 7 becomes "5", and the video data Since the storage content of the storage circuit 9 is "television", the storage content of the video data temporary storage circuit 8 is also "television". Next, when channel switching is input in step 8, the video data storage circuit 9
The discriminating circuit 4 discriminates between the memory contents of the video data temporary memory circuit 8 and the memory contents of the video data temporary memory circuit 8.
The storage contents of the channel data storage circuit 6 and the storage contents of the channel data temporary storage circuit 7 are exchanged, and the storage contents of the channel data storage circuit 6 become "5", and the storage contents of the channel data storage circuit 7 become "5".
The memory content of will be "7". Next, when channel replacement is input in step 9, it is determined in the same manner as in step 8, and the memory content of the channel data storage circuit 6 becomes "7", and the memory content of the channel data temporary memory circuit 7 becomes "5". This is the same state as in step 7. As described above, according to the present embodiment, by inputting channel swapping, it is possible to alternately switch video screens in the same way as selecting two channels alternately. In this embodiment, the judgment condition of the discrimination circuit is that when the storage contents of the video data temporary storage circuit 8 and the storage contents of the video data storage circuit 9 are the same, the channel data is swapped, and when they are different, the video data is swapped. However, this determination may be made, for example, by replacing the channel data when the stored content of the video data storage circuit 9 is "TV" and replacing the video data at other times, or by changing the storage content of the video data storage circuit 9. It may be determined that the channel data is replaced only when the content and the stored content of the video data temporary storage circuit 8 are both "television", and the video data is replaced in other cases. Effects of the Invention As described above, the present invention uses an input called channel swapping to operate as channel swapping when you were watching TV immediately before, and as video swapping when you were watching a video immediately before. This makes it possible to switch between the previously viewed screen and the currently viewed screen on the television receiver's cathode ray tube with a single input.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic tuning circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional electronic tuning circuit. DESCRIPTION OF SYMBOLS 1... Channel switching circuit, 2... Channel switching control circuit, 3... Video switching circuit, 4... Discrimination circuit, 5... Tuning voltage generation circuit, 6... Channel data storage circuit, 7... Channel data Temporary storage circuit, 8...Video data temporary storage circuit,
9... Video data storage circuit, 10... Video data output circuit.

Claims (1)

[Claims] 1. A tuning voltage generation circuit that generates a tuning voltage corresponding to the current channel data read from the channel data storage circuit by inputting the current channel data, and a tuning voltage generation circuit that generates a tuning voltage corresponding to the data by inputting the current channel data read from the channel data storage circuit; a video switching output circuit that outputs a video switching signal by receiving the current video data read from the video data storage circuit; a video data temporary storage circuit for temporarily storing video data; and storing current video data read from the video data storage circuit by a video switching input as previous video data in the video data temporary storage circuit;
a video switching circuit for storing new video data in the video data storage circuit; and storing current channel data read from the channel data storage circuit by a channel switching input as previous channel data in the channel data temporary storage circuit; a channel switching circuit that stores new channel data as current channel data in the channel data storage circuit, and stores "TV" in the video data temporary storage circuit only when the storage content of the video data storage circuit is "TV"; , the previous channel data in the channel data temporary storage circuit and the current channel data in the channel data storage circuit are alternately exchanged by a channel exchange input, or the previous video data in the video data temporary storage circuit and the video a channel swapping control circuit for controlling whether to alternately swap current video data in the data storage circuit; and determining the previous video data in the video data temporary storage circuit and the current video data in the video data storage circuit; An electronic channel selection device characterized in that the channel switching control circuit includes a discrimination circuit for controlling whether the channel switching control circuit switches channel data or video data.