JPH04306012A - Channel selection device and channel selection method - Google Patents

Abstract

PURPOSE:To attain the channel selection of a television receiver even in the case of fault detection by providing a position memory with a check function so as to attain the channel selection. CONSTITUTION:A check data error detection means 5 reads a check data from check data 9-11 according to the position selection input. In the case of occurrence of an error, a position commanded by a channel command input 1 is outputted to a tuner 3 as a channel selection data according to a fault detection output from the memory control means 4. Thus, even when a memory is in abnormality, the selected position is used for the channel and then the channel selection is implemented and the television receiver acts normally.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a channel selection device used in color television receivers, etc., and is designed to enable minimum channel selection operation even if the memory is damaged or abnormal data is obtained. This is what I did.

0002

2. Description of the Related Art In the case of a conventional channel selection device, if the memory becomes abnormal or damaged, normal channel selection cannot be performed and the device cannot be used as a television receiver at all.

A conventional channel selection device will be explained below with reference to the drawings. First, FIG. 3 is a block diagram of a conventional channel selection device. In FIG. 3, 12 is a channel selection instruction input, 16 to 18 are position memories for storing n pieces of channel selection data for each position, and 15 is a position memory for controlling the position memories 16 to 18 to store data. 14 is a tuner that actually obtains the image of the television receiver; 13 is data obtained by controlling the memory control means 15 in accordance with the instructions from the channel selection instruction input 12; This is a channel selection control means that sends the above tuner 14 to the tuner 14.

The operation of the conventional channel selection device configured as described above will be explained using FIG. 3. In FIG. 3, when a position selection command comes to the channel selection instruction input 12, if the position is 2 according to the input, the memory control means 15 reads out the channel selection data of position 2 from the position memory 2, and the channel selection control means 13 sends the channel selection data to the tuner 14, and the selected channel is displayed on the television receiver.

[0005]

[Problem to be Solved by the Invention] However, in the above conventional configuration, if the memory is damaged, normal data cannot be read from the position memory, so the data sent to the tuner remains abnormal data. The TV receiver will no longer display a normal screen.

The present invention solves the above problem by adding check data to the position memory for each position, detecting that the memory is abnormal when the memory is damaged, and detecting the abnormality. An object of the present invention is to provide a channel selection device that can select VHF channels and UHF channels from 1 to 12 (or the maximum number of positions such as 15) by regarding the position number as a channel and performing a channel selection operation. shall be.

[0007]

[Means for Solving the Problems] In order to achieve this object, the channel selection device of the present invention includes a channel selection memory for each position,
This system uses check data for each position to detect whether or not the check data is abnormal, and if it is abnormal, the position data is regarded as channel selection data and a channel selection operation is performed.

[0008]

[Effect] With this configuration, even if the memory is damaged, the
It becomes possible to receive channels up to channel n (maximum number of positions), and it can be used normally in areas where VHF is the main channel, such as large cities.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A 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 the main parts of a channel selection device according to the present invention. In FIG. 1, 1 is a channel selection instruction input, 6 to 8 are position memories that store n pieces of tuning data for each position, and 9 to 11 are position memories that store n pieces of check data for each position. 5 is a check data memory for each position, and 5 is a check data error detection means for reading check data from the above-mentioned check data memories 9, 10, and 11 for each position to detect whether the position is normal or abnormal; 4 is a check data error detection means; If the output of the check data error detection means 5 is normal, the tuning data of the position selected from the position memories 6, 7, and 8 is read out and output, and the output of the check data error detection means 5 is determined to be error-free. 3 is a tuner that actually obtains the image of the television receiver; 2 is a tuner that outputs a message indicating that there is an abnormality; If the data obtained is abnormal, the same channel as the channel selection instruction input 1 is sent to the tuner 14, and if the data obtained by controlling the memory control means 4 is normal, the data read from the memory control means 4 is sent. This is a channel selection control means that sends the above tuner 14 to the tuner 14.

FIG. 2(a) is an example of data of the present invention,
FIG. 2(b) is a flowchart showing the data flow of the channel selection means of the present invention. FIG. 2-1 shows an example in which 19 channels in 3 positions are stored in the position data memory and the position check data memory. In Figure 2-2, tuning command P3 (select position 3)
When a command is received, the position check data of position 3 is first read out and compared with preset fixed data 01011010 (binary data) to see if they are the same. If the position check data and fixed data are the same, it is determined that the contents of the position data memory are correct, and the position data of position 3 is read out and transferred to the tuner. If the position check data and fixed data are different, it is determined that the position data memory is abnormal, and the command position 3 of the tuning command P3 (3 positions) is converted into tuning data and transferred to the tuner.

The channel selection device configured as described above will be explained below using FIG. 1. In FIG. 1, when a position selection command comes to the channel selection command input, if the input is, for example, position 2, the check data error detection means 5
reads the check data from check data 10 for each position and selects that position (for example, position 2)
It is detected whether the check data is correct or abnormal, and if correct, the memory control means 4 reads and outputs the tuning data of that position (for example, position 2). If the output of the check data detection means 5 is an error, the memory control means 4 outputs that there is an abnormality. If the data obtained from the memory control means 4 is normal, the channel selection control means 2 outputs the data as it is to the tuner 3, and if the data obtained from the memory control means 4 is abnormal, it outputs the data as it is to the tuner 3 according to the channel selection instruction input 1. By outputting the instructed position to the tuner 3 as channel selection data, if the memory is normal, the image of the channel selected by the television receiver will be displayed on the display screen, and if the memory is abnormal, the selected channel will be displayed on the display screen. The selected position becomes that channel, and the video of that channel will be displayed on the display screen.

[0013] In this implementation order, if the output of the memory control means 4 is abnormal, the position selected by the channel selection control means 2 is converted to a channel and sent to the tuner, but if the check data is abnormal. includes memory control means 4
The selected position may be converted into a channel and output, and the channel selection control means 5 may send the output of the memory control means 4 to the tuner 3 as it is.

[0014] Also, check data for each position is such that normal data is written when tuning data is written to that position.

[0015]

Effects of the Invention As described above, the present invention allows the maximum number of positions (for example, 12 positions if the
), you can select channels up to
To provide a channel selection device that can operate normally as a television receiver even if the memory is broken in an area where HF is the main channel.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts of a channel selection device in an embodiment of the present invention.

FIG. 2 is a flowchart diagram of check data error detection means.

FIG. 3 is a block diagram of a conventional channel selection device.

[Explanation of symbols]

1　Enter channel selection instruction 2 Tuning control means 3 Tuner 4 Memory control means 5 Check data error detection means 6 Position memory 7 Position memory 8 Position memory 9 Check data for each position

Claims (2)

[Claims] 1. A channel selection memory for each position, check data for each position, check data error detection means for detecting an error from the check data, and when the output of the check data error detection means is correct, for each position. memory control means for reading out and outputting tuning data from the tuning memory of and outputting error information when the output of the check data error detection means is an error; and tuning control means for controlling the entire tuning operation; A channel selection device characterized by being equipped with a tuner. [Claim 2] The position data for each position and the check data for each position are read out from the memory as one block, and the check data for each position and the fixed data are compared, and if they are different, the position data for each position is read out. A channel selection method in which the specified position is converted into position data to create channel selection data, the check data for each position is compared with the fixed data, and if they are the same, the position data is read out and used as the channel selection data. .