JP2006005757A - Channel selection device and channel setting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a channel selection method for associating a channel shown in an area code with a channel key so that a number appended to the channel key matches with a number assigned to the channel, and associating a channel not shown in the area code with a vacant channel key. <P>SOLUTION: At first, all of channel numbers currently assigned to channels having electric field strength equal to or larger than a predetermined strength are stored in memory locations A (1) to A (M). Next, as for channels of which the channel numbers are stored in the memory locations A (1) to A (M), a channel having a channel number shown in an area code is associated with each channel key according to the area code. A channel having a channel number not shown in the area code is associated with a remaining channel key. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a channel selection device that selects a specific channel from received signals, such as a television receiver. The present invention also relates to a channel setting method for setting a channel to be selected when a channel key is selected by associating the channel with a channel key for selecting a channel.

  The television receiver displays an image on a screen by selecting and demodulating a signal of a channel designated by a user from received signals. A television receiver is provided with a plurality of keys (hereinafter referred to as channel keys) for selecting a channel.

  A different number is assigned to each channel key, and a receivable channel is associated with each channel key. In particular, a channel using VHF (Very High Frequency) is associated with a channel key assigned the same number as the channel number. When a channel key is selected, the television receiver demodulates the signal of the channel associated with the selected channel key and displays an image on the screen.

  On the other hand, television broadcasting includes not only VHF but also UHF-L (Ultra High Frequency Low), UHF-H (Ultra High Frequency High), CATV (Community Antenna TV), etc., which use a frequency band different from VHF. ing.

  Therefore, in a television receiver, the number of channels that can be selected is larger than the number of channels that use VHF. When there are many channels that can be selected, the user can view many broadcasts, while selecting a channel such as having to perform complicated operations to select a desired channel. It becomes difficult.

  Therefore, the television receiver automatically selects the channel number that can be selected by selecting the channel key by selecting and associating a predetermined number of channels with a predetermined number of channel keys. A function to set (hereinafter also referred to as auto-preset) is installed.

  As a first specific example of the auto-preset function, the field strength of receivable channels is detected (hereinafter referred to as channel search), and is equal to or less than the channel key in order of increasing field strength from a plurality of channels. The number of channels is selected and associated with each channel key.

  As a second specific example of the auto-preset function, a channel search is performed from the lowest frequency to the highest frequency, the number of channels receiving radio waves is selected to be equal to or less than the channel key, and the selected channel is selected. Compared with the data showing the correspondence between the channel number of the channel that can be received in the area and the channel key to which this channel number is assigned (hereinafter referred to as area code) Examples include associating each channel with a channel key assigned the same number as the channel number.

Japanese Patent Laid-Open No. 7-240669

  However, in the first specific example described above, since the number assigned to the corresponding channel key and the channel number assigned to each channel are not matched according to the area code, the channel number of the auto-preset channel is the channel number. The relationship between the channel and the channel key associated with each other, such as the number assigned to the key, will not match the area code. Therefore, there are inconveniences in use such as it becomes difficult for the user to grasp the channel being selected.

  In the second specific example, a channel having a low frequency may be selected even if the electric field strength is weak, and a channel having a high frequency may not be selected even if the electric field strength is strong. Therefore, when the selected channel and the area code are compared, it becomes difficult to completely match, and it becomes difficult to auto-preset each channel to a channel key assigned the same number as the assigned channel number. End up.

  Furthermore, in the second specific example, in order to auto-preset each channel to a channel key assigned the same number as the assigned channel number, the number of the selected channel and the channel number indicated in the area code are used. It is also a condition that the number of matches. Therefore, when all the channels with the channel number indicated in the area code are selected, for example, when the number of selected channels is larger than the number of channels indicated in the area code, each channel is selected. Will no longer be auto-preset to the channel key with the same number as the assigned channel number.

  The present invention has been proposed in view of the above-described conventional situation, and whether or not the number of channels whose electric field strength is equal to or higher than a predetermined strength matches the number of channels indicated in the channel data. Regardless of the above, a receiving apparatus capable of associating a channel having the same channel number as the allocated channel number among the numbers assigned to the respective keys of the channel selection means with the same number as the allocated channel number, and An object is to provide a channel setting method.

  The channel selection device according to the present invention is provided with a plurality of channel keys to which different numbers are assigned, and selects one of the plurality of channel keys to correspond to the selected channel key. In the channel selection device that selects the attached channel, a detection unit that detects a channel whose radio wave intensity is equal to or higher than a predetermined strength from among the plurality of channels, and a channel that is detected by the detection unit are allocated. Detection channel storage means for storing the assigned channel numbers, and the channel numbers assigned to the channels respectively associated with the plurality of channel keys for each region correspond to the numbers assigned to the plurality of channel keys. Area code storage means in which the area code shown is stored Channel setting means for setting a channel to be selected when the channel key is selected by associating a channel number stored in the detection channel storage means with each of the channel keys, The channel setting means selects a channel in which the channel number is stored in the area code among the channels in which the channel number is stored in the detection channel storage means with respect to the channel key as indicated by the area code. And a channel whose channel number is not stored in the area code is associated with a channel key not associated with a channel among the channel keys.

  The channel setting method according to the present invention is provided with a plurality of channel keys to which different numbers are assigned, and is associated with the channel key selected by selecting one of the plurality of channel keys. A channel setting method for associating a channel with a plurality of channel keys of a channel selection device that selects a channel, wherein a channel whose radio field intensity is equal to or higher than a predetermined intensity is selected from the plurality of channels. A field number detecting step for detecting, a channel number storing step for storing in the storage means the channel number assigned to the channel detected in the field strength detecting step, and a channel number stored in the storing means. The above channels for each region The channel number assigned to the channel associated with the channel code indicated by the area code shown corresponding to the number assigned to the plurality of channel keys is changed according to the area code. An association step of associating a channel whose channel number is not indicated in the area code with a channel key not associated with a channel among the channel keys after associating with a key.

  The channel selection apparatus and channel setting method according to the present invention first detect the electric field strength of each channel, and store all channel numbers assigned to the channels whose electric field strength is equal to or higher than a predetermined strength in the storage means. The channel whose channel number is stored in the area code among the channels whose channel numbers are stored in the storage means is associated with the channel key according to the area code, and the channel whose channel number is not stored in the area code is The channel key is associated with a channel key not associated with a channel among the plurality of channel keys.

  Therefore, according to the channel selection device and the channel setting method according to the present invention, the channel whose channel number is indicated in the area code is associated with the channel key to which the same number as the channel number is assigned. A channel whose channel number is not shown can be associated with an empty channel. Therefore, the channel selection apparatus and the channel setting method according to the present invention can associate each channel with a channel key so that a number of channels can be easily specified.

  In addition, the channel selection apparatus and channel setting method according to the present invention detect all channels whose electric field strength is equal to or higher than a predetermined strength, select a predetermined number from the strongest electric field strength, and associate them with keys. Therefore, it is possible to associate channels with strong electric field strength without omission.

  In addition, the channel selection apparatus and channel setting method according to the present invention provide a channel stored in the area code when the channel stored in the area code is included in the selected predetermined number of channels. Each channel is associated with each key according to a number. Therefore, even when a channel that is not stored in the area code is included in the predetermined number, the channel is associated with each channel key according to the channel number stored in the area code. It becomes easy to specify.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a television receiver 1 to which the present invention is applied selects an antenna 2 that receives a signal transmitted from a broadcasting station, and selects a signal of a desired channel from the signal received by the antenna 2. A tuner 3 that amplifies and converts to an intermediate frequency signal, and an intermediate frequency signal output from the tuner 3 is amplified and output, and a voltage corresponding to the level of the intermediate frequency signal (hereinafter referred to as an AGC (Auto Gain Control) voltage). VIF (Video Intermediate Frequency) circuit 4 that outputs ..), a detection circuit 5 that detects an intermediate frequency signal output from the VIF circuit 4 and extracts and outputs a video signal, and a video signal output from the detection circuit 5 And a video circuit 6 that separates the supplied video signal into an R signal, a G signal, and a B signal, and an R signal, a G signal, and a B signal supplied from the video circuit 6 Based and a monitor 7 that displays an image.

  The television receiver 1 includes an AGC circuit 8 that controls an amplification factor of a signal by the tuner 3 based on an AGC voltage output from the VIF circuit 4 or an AGCATT signal supplied from a microcomputer described later, and a detection circuit 5. A synchronization signal detection circuit 9 is provided that extracts only the synchronization signal from the output video signal, outputs 1 signal when the level of the synchronization signal is above a certain level, and outputs 0 signal when the level is below the certain level.

  The television receiver 1 includes a plurality of channel keys to which numbers are assigned. By selecting a channel key, the channel receiver 10 that specifies a channel to be selected by the tuner 3 and data are stored. And a microcomputer 12 for controlling each unit, and a switch 13 having one terminal connected to the microcomputer 12 and the other terminal grounded.

  The television receiver 1 has a channel preset mode and a broadcast mode. In the channel preset mode, a receivable channel is automatically associated with each channel key of the channel designating unit 10 (hereinafter also referred to as an auto preset), and the channel selected by selecting the channel key is selected. Changes can be made. In the broadcast mode, the channel signal associated with the selected channel key is demodulated and displayed on the monitor 7 so that the user can view the broadcast.

  The tuner 3 includes a PLL synthesizer connected to the microcomputer 12, and by tuning to the frequency of the channel specified by the channel selection signal supplied from the microcomputer 12 among the signals received by the antenna 2, The channel specified by the channel selection signal is selected from the signal received by the antenna 2 and amplified, converted into an intermediate frequency signal, and output to the VIF circuit 4. The amplification factor of the signal by the tuner 3 is controlled by the AGC circuit 8. Details of the channel selection signal will be described later.

  The output voltage of the tuner 3 is proportional to the electric field strength of the selected channel. The tuner 3 has a low output voltage when a channel with a high electric field strength is selected, and a high output voltage when a channel with a low electric field strength is selected. Therefore, by measuring the output voltage of the tuner 3, the electric field strength of the selected channel can be measured.

  In the present embodiment, the frequencies that can be received by the tuner 3 include VHF (Very High Frequency), UHF (Ultra High Frequency), CATV (Community Antenna TV), satellite broadcasting, and the like.

  The VIF circuit 4 detects and amplifies the intermediate frequency signal output from the tuner 3 and supplies it to the detection circuit 5. Further, the VIF circuit 4 supplies an AGC voltage corresponding to the level of the intermediate frequency signal as shown in FIG. 2 to the AGC circuit 8 and the microcomputer 12.

  The detection circuit 5 detects the intermediate frequency signal supplied from the VIF circuit 4, extracts a video signal, and supplies it to the video circuit 6 and the synchronization signal detection circuit 9.

  The AGC circuit 8 controls the amplification factor of the signal by the tuner 3 based on the control of the VIF circuit 4 and the microcomputer 12. More specifically, in the broadcast mode, the signal amplification rate of the tuner 3 is controlled based on the AGC voltage supplied from the VIF circuit 4 and the AGCATT (AGC attenuation) signal supplied from the microcomputer 12. In the preset mode, the signal amplification factor of the tuner 3 is controlled based on the AGCATT signal supplied from the microcomputer 12. In the present embodiment, a switch 15 is provided between the AGC circuit 8 and the VIF circuit 4, and the switch 15 is turned off in the preset mode.

  The synchronization signal detection circuit 9 extracts only the synchronization signal from the video signal output from the detection circuit 5, and when the level of the synchronization signal is a certain level or higher, that is, when the electric field strength is a predetermined value or more, one signal When the electric field strength is less than a predetermined value, a 0 signal is output.

  The channel designating unit 10 has N (where N is a natural number) channel keys, and is connected to a PLL synthesizer provided in the tuner 3 via the microcomputer 12. Each channel key is associated with the selected N channels in a one-to-one relationship, and when one of them is pressed, the signal of the associated channel is set to be selected by the tuner 3. Has been.

  The memory 11 includes memory locations A (1) to A (M) (where M is a natural number greater than N) having a number of memory locations exceeding the number N of channel keys, and the memory locations A (1) to A. Memory locations B (1) to B (M) for storing data corresponding to (M). Data is stored in memory locations A (1) to A (M) and memory locations B (1) to B (M) in the channel preset mode.

  The memory locations A (1) to A (M) store channel numbers assigned to channels whose electric field strength is equal to or higher than a predetermined value. Of the memory locations A (1) to A (M), the memory locations A (1) to A (N) are ultimately channels associated with channel keys assigned numbers 1 to N, respectively. The channel number assigned to is stored. Further, the memory locations B (1) to B (M) include the electric field strength of each channel in which the channel numbers are stored in the memory locations A (1) to A (M), specifically, an AD value described later. Is memorized.

  Further, in the memory 11, as shown in FIG. 3, the number assigned to each channel key and the number assigned to the channel associated with each channel key are shown corresponding to each region. Data (hereinafter referred to as area code) is stored. For example, in the area A shown in FIG. 3, the area code includes channels to which channel numbers 51, 49, 53, 57, and 59 are assigned to channel keys assigned 1, 3, 4, 6, and 8, respectively. It shows that it is matched. Note that 0 in FIG. 3 means that the associated channel is not designated.

  The auto preset switch 13 switches the operation mode of the television receiver 1 to a broadcast mode or a channel preset mode. Specifically, when the auto preset switch 13 is turned on, the television receiver 1 is set to the channel preset mode, and when the auto preset switch 13 is turned off, the television receiver 1 is set. Is in broadcast mode.

  The microcomputer 12 is supplied with the 1 signal or 0 signal output from the synchronization signal detection circuit 9. Further, the microcomputer 12 converts the AGC voltage supplied from the VIF circuit 4 from analog to digital and converts it into a numerical value (hereinafter referred to as an AD value), and returns the AD value to determine the electric field strength of the signal selected by the tuner 3. To detect.

  Further, the microcomputer 12 transmits a channel selection signal to the tuner 3 and controls the tuner 3 so as to select a signal of a desired channel. The channel selection signal is a signal for controlling the tuner 3 so as to select the channel selected by the channel key in the broadcast mode, and is generated according to an auto preset program described later in the channel preset mode. The

  Further, the microcomputer 12 supplies an AGCATT signal to the AGC circuit and controls the amplification factor of the signal by the tuner 3. In the channel preset mode, the AGCATT signal is generated according to an auto preset program described later.

  The microcomputer 12 performs auto-preset in the channel preset mode.

  Next, a method in which the microcomputer 12 performs auto-preset will be described with reference to the flowchart shown in FIG. In the following example, the case where the television receiver 1 is used in the region E shown in FIG. 3 and N = 12 and M = 15 will be described as an example.

  First, in step ST1, the microcomputer 12 erases the channel numbers stored in the memory locations A (1) to A (M) and the electric field strengths stored in the memory locations B (1) to B (M). To do. Further, the count index i of the channel for detecting the electric field strength is set to 1, and the count index j of the channel in which the memory number and the electric field strength are stored in the memory 11 is set to 1.

  Note that erasure of channel numbers stored in memory locations A (1) to A (M) and erasure of electric field strengths stored in memory locations B (1) to B (M) are not essential. In step ST4, which will be described later, the channel number and the electric field strength may be erased when they are newly stored.

  Next, in step ST2, the microcomputer 12 compares i and M. If i is equal to or less than M, the microcomputer 12 proceeds to step ST3, and if i is greater than M, the microcomputer 12 proceeds to step ST6.

  Next, in step ST3, the microcomputer 12 selects the i-th channel for measuring the electric field strength from the plurality of channels, and measures the electric field strength of the selected channel. In this embodiment, the electric field strength is sequentially detected from a channel having a low frequency. That is, the i-th channel whose electric field strength is measured is the i-th lowest channel among the channels that can be received by the television receiver 1. In the following description, the i-th channel in which the electric field strength is measured is also referred to as channel i.

  More specifically, the microcomputer 12 generates a channel selection signal for controlling the tuner 3 so as to select a signal of channel i and outputs the channel selection signal to the tuner 3. The tuner 3 selects a channel i signal according to the channel selection signal supplied from the microcomputer 12. Then, the microcomputer 12 detects whether or not one signal is supplied from the synchronization signal detection circuit 9, and when one signal is supplied, determines that the electric field strength of the channel i is equal to or higher than a predetermined strength. Then, the process proceeds to step ST4. If the 0 signal is supplied, it is determined that the electric field intensity of the channel i is less than the predetermined intensity, and the process proceeds to step ST5.

  Next, in step ST4, the microcomputer 12 records the channel number assigned to the channel i in the memory location A (j) as shown in FIG. 5A (step ST21). Then, the microcomputer 12 performs analog / digital conversion on the AGC voltage supplied from the VIF circuit 4 to generate an AD value, and records it in the memory location B (j) as shown in FIG. 5A (step ST22). ). Then, the microcomputer 12 increases the value of j by 1 and proceeds to step ST5 (step ST23).

  Next, in step ST5, the microcomputer 12 increases the value of i by 1, and returns to step ST2.

  In step ST6, the microcomputer 12 determines whether j is larger than N. If it is determined that j is greater than N, the process proceeds to step ST7, and if j is N or less, the process proceeds to step ST8.

  In step ST7, as shown in FIG. 5 (B), the microcomputer 12 stores the channel numbers and memory locations B (1) to B (B) stored in the memory locations A (1) to A (j) in descending order of AD values. The AD values stored in (j) are rearranged, and the process proceeds to step ST8.

  In step ST8, the microcomputer 12 determines whether or not all the channel numbers indicated in the area code are included in the channel numbers stored in the memory locations A (1) to A (j). When all the channel numbers indicated in the area code are included, the process proceeds to step ST9, and when all the channel numbers indicated in the area code are not included, the process proceeds to step ST12.

  In step ST9, as shown in FIG. 5C, the microcomputer 12 converts the channel number stored in the memory locations A (1) to A (N) into the area code. Then, the process proceeds to step ST10. More specifically, a channel number y (where y is a natural number) is assigned to a channel key to which x (where x is a natural number between 1 and N) is assigned to the area code. When it is indicated that a certain channel is associated, y is stored in the memory location A (x).

  Next, in step ST10, the microcomputer 12 determines whether or not channel numbers that do not match the area code are stored in the memory locations A (1) to A (N). If a channel number that does not match the area code is stored, the process proceeds to step ST11. If a channel number that does not match the area code is not stored, the process proceeds to step ST13.

  In step ST11, as shown in FIG. 5D, the microcomputer 12 stores the channel number not shown in the area code among 1 to N and the memory locations A (1) to A (N) in step ST4. The channel number z is compared with a channel number not shown in the area code, and if there is a matching number z (where z is a natural number not less than 1 and not more than N), the channel number z is stored in the memory location. Store again in A (z) (step ST31). Then, as shown in FIG. 5E, the channel numbers not stored in the memory locations A (1) to A (N) in steps ST9 and ST31 are stored in the memory locations A (1) to A (N ) Is re-stored in a vacant position (step ST32). In the present embodiment, the smaller channel number is stored again in the memory location to which the smaller number is assigned. Then, the process proceeds to step ST13.

  Note that the numbers enclosed in circles in FIGS. 5C, 5D, and 5E are channel numbers indicated in the area code.

  In step ST12, the microcomputer 12 compares the numbers stored in the memory locations A (1) to A (N) with 1 to N and matches the number w (where w is 1 or more and N The following natural number) is recorded again in the memory location A (w) (step ST41). In step ST41, the channel numbers that are not stored in the memory locations A (1) to A (N) are stored again in the vacant memory locations among the memory locations A (1) to A (N) ( Step ST42).

  Finally, in step ST13, the microcomputer 12 associates the channels whose channel numbers are stored in the memory locations A (1) to A (N) with the channel keys assigned with the numbers 1 to N, respectively.

  As described above, the television receiver 1 to which the present invention is applied first stores in the memory 11 all the channel numbers assigned to the channels whose electric field strength is equal to or higher than a predetermined strength, and is indicated by the area code. If the channel number is stored, the channel is associated with each channel key according to the area code, and the channel key with the same number assigned to the channel whose channel number is not indicated in the area code is empty. If the channel key is associated with the channel key, the channel that is not associated with the channel key is associated with the channel key that is not associated with any channel.

  Therefore, in the television receiver 1 to which the present invention is applied, the channel indicated in the area code is associated with each channel key according to the area code, and the channel in which the channel number is not indicated in the area code is vacant. Can be associated. In addition, for a channel whose channel number is not indicated in the area code, if the channel number matches the number assigned to the channel key, it is associated with the channel key assigned the same number as the channel number. That is, the television receiver 1 to which the present invention is applied can associate each channel with a channel key so that a number of channels can be easily specified.

  In addition, the television receiver 1 to which the present invention is applied detects all the channels whose electric field strength is equal to or higher than a predetermined strength, and selects and presets N channels in the descending order of the electric field strength. It is possible to preset a strong channel without omission.

  In addition, the television receiver 1 to which the present invention is applied has a channel indicated by the area code in the selected N channels, and each channel is assigned to each channel key according to the area code. Preset. Therefore, even when N channels that are not indicated in the area code are included in the N channels, the channel is preset to each channel key according to the area code, and the channel can be easily specified.

  The television receiver 1 displays the channels stored in the memory locations A (N + 1) to A (M) on the monitor 7 at step ST13, and the user operates a remote controller or the like (not shown). It is preferable that a desired channel can be selected from the displayed channels. With this configuration, the television receiver 1 can decode a signal of a channel that is not associated with each channel key and allow the user to view it.

  By the way, the television receiver 1 adjusts the electric field intensity recorded in the memory locations B (1) to B (M) when performing auto-preset, so that the memory locations A (1) to The value of the electric field strength required to store the channel number in A (M), that is, the minimum electric field strength value required for the synchronization signal detection circuit 9 to output one signal (hereinafter referred to as a threshold value). ) Is preferably changed.

  More specifically, there are VHF-L, VHF-H, CATV, UHF-L, UHF-H and the like as frequency bands used in television broadcasting, and each frequency band is associated with a channel key. It is preferable that the threshold value of the electric field strength can be changed. With such a configuration, for example, the UHF-L frequency band channel can be changed by increasing the amplification factor of the signal by the tuner 3 only when searching for the UHF-L frequency band channel. Compared with a channel in the frequency band, it is possible to easily correspond to the channel key.

  Next, with reference to the flowchart shown in FIG. 6, the microcomputer 12 performs auto-preset while changing the threshold value of the electric field strength when the microcomputer 12 is associated with the channel key for each frequency band in the channel preset mode. While explaining.

  The operation of the microcomputer 12 when performing auto-preset while changing the threshold value of the electric field strength when being associated with the channel key for each frequency band is stored in the memory locations A (1) to A (M) in step ST1. The channel number and the electric field strength stored in the memory locations B (1) to B (M) are erased, the count indexes i and j are set to 1, and i and M are compared in step ST2. However, the operation is the same as that of the microcomputer 12 when performing auto-preset without changing the threshold value of the electric field strength as shown in FIG. 4 except that the process proceeds to step ST50 before proceeding to step ST3 when i is M or less. It is. Therefore, the description of the operation of the microcomputer 12 other than step ST50 is omitted. In FIG. 6, the description after step ST6 is omitted.

  In step ST50, the frequency band of channel i is determined, and the threshold value of the electric field strength is changed according to the frequency band.

  More specifically, first, in step ST51, it is determined whether the frequency band of channel i is VHF-L, VHF-H, CATV, UHF-L, or UHF-H. If it is determined that it is VHF-L, the process proceeds to step ST52. If it is determined that it is VHF-H, the process proceeds to step ST53. If it is determined that it is CATV, the process proceeds to step ST54, and UHF- When it is determined that it is L, the process proceeds to step ST55, and when it is determined that it is UHF-H, the process proceeds to step ST56.

  In step ST52, the microcomputer 12 controls the AGC circuit 8 by changing the AGCATT signal, sets the signal amplification factor of the tuner 3 to A1, and proceeds to step ST3.

  In step ST53, the microcomputer 12 controls the AGC circuit 8 by changing the AGCATT signal, sets the amplification factor of the signal by the tuner 3 to A2, and proceeds to step ST3.

  In step ST54, the microcomputer 12 controls the AGC circuit 8 by changing the AGCATT signal, sets the amplification factor of the signal by the tuner 3 to A3, and proceeds to step ST3.

  In step ST55, the microcomputer 12 controls the AGC circuit 8 by changing the AGCATT signal, sets the signal amplification factor of the tuner 3 to A4, and proceeds to step ST3.

  In step ST56, the microcomputer 12 controls the AGC circuit 8 by changing the AGCATT signal, sets the signal amplification rate by the tuner 3 to A5, and proceeds to step ST3.

  As described above, by changing the threshold value of the electric field strength when the channel number is stored in the memory locations A (1) to A (M) for each frequency band of the channel for measuring the electric field strength, It is possible to adjust the channel associated with the channel key, such as making it easier to associate the channel of the frequency band with the channel key.

It is a block circuit diagram of a television receiver to which the present invention is applied. It is a figure which shows an example of the AGC voltage value for every channel which the VIF circuit with which the television receiver is equipped outputs. It is a figure which shows an example of the area code memorize | stored in the memory with which the television receiver is equipped. It is a flowchart which shows the operation | movement of a microcomputer when the television receiver is in auto preset mode. (A) is a figure which shows the state by which the channel number and electric field strength were each memorize | stored in memory location A (1) -A (M) and B (1) -B (M), (B) It is a figure which shows the state where the channel number was memorize | stored again in order with strong electric field strength, (C) is the channel shown by the area code being memorize | stored according to the area code, and is not shown by the area code. It is a figure which shows the state by which the channel with a strong electric field strength was memorize | stored in the vacant memory location. 6 is a flowchart showing the operation of the microcomputer when each channel is associated with a channel key while changing the threshold value of the electric field strength for each frequency when the television receiver is in the auto preset mode.

Explanation of symbols

1 TV receiver, 2 antenna, 3 tuner, 4 VIF circuit, 5 detection circuit, 6 video circuit, 7 monitor, 8 AGC circuit, 9 synchronization signal detection circuit, 10 channel designation section, 11 memory, 12 microcomputer, 13 auto Preset switch

Claims (16)

A plurality of channel keys to which different numbers are assigned are provided, and a channel for selecting a channel associated with the selected channel key by selecting one of the plurality of channel keys. In the channel selection device,
Detecting means for detecting a channel whose radio field intensity is a predetermined intensity or more from the plurality of channels;
Detection channel storage means for storing a channel number assigned to the channel detected by the detection means;
Area code in which channel codes assigned to the channels respectively associated with the plurality of channel keys are stored in correspondence with the numbers assigned to the plurality of channel keys for each region. Storage means;
Channel setting means for setting a channel to be selected when the channel key is selected by associating a channel number stored in the detection channel storage means with each of the channel keys,
The channel setting means selects a channel in which the channel number is stored in the area code among the channels in which the channel number is stored in the detection channel storage means with respect to the channel key as indicated by the area code. A channel tuning apparatus characterized in that a channel whose channel number is not stored in the area code is associated with a channel key not associated with a channel among the channel keys. The channel tuning device according to claim 1, wherein the area code indicates the radio field intensity of the channel corresponding to the channel number. The channel setting means, after associating a channel whose channel number is stored in the area code among the channels whose channel numbers are stored in the detection channel storage means, according to the area code. From the channels whose channel codes are not stored in the area code, select the channels having the same number or less as the number of the channel keys not associated with the channel in order of increasing electric field strength. The channel tuning device according to claim 2, wherein the channel is associated with a channel key that is not associated with a channel. The channel setting means associates the channels in the descending order of electric field strength from the channels whose channel numbers are not stored in the area code among the channels whose channel numbers are stored in the detection channel storage means. Select a channel equal to or less than the number of the above channel keys, and compare the channel number assigned to the selected channel with the number assigned to the channel key that is not associated with the channel key. 4. The channel selection apparatus according to claim 3, wherein a channel to which a matching channel number is allocated is associated with a channel key to which the matching number is assigned. The channel tuning device according to claim 2, further comprising: radio wave intensity adjusting means for adjusting the radio wave intensity of the channel stored in the detection channel storage means. Receiving means for receiving a signal transmitted from a broadcasting station;
Signal selecting means for selecting and outputting the signal of the channel selected by selecting the channel key from the signals received by the receiving means;
The channel selection apparatus according to claim 5, wherein the radio wave intensity adjusting means adjusts the intensity of the signal output from the signal selecting means. The channel tuning device according to claim 5, wherein the radio wave intensity adjusting means adjusts the radio wave intensity of the channel for each frequency band. Display means for displaying an image;
Display image control means for controlling the image displayed on the display means,
The display image control means causes the display means to display a channel in which a channel number and an electric field strength are stored in the detection channel storage means and is not associated with the channel key. The channel selection apparatus according to claim 2. A plurality of channel keys to which different numbers are assigned are provided, and a channel selection is performed by selecting a channel associated with the selected channel key by selecting one of the plurality of channel keys. A channel setting method for associating a channel with each of the plurality of channel keys of the device,
An electric field intensity detection step for detecting a channel having a radio field intensity equal to or higher than a predetermined intensity from the plurality of channels;
A channel number storage step of storing in a storage means a channel number assigned to the channel detected in the electric field intensity detection step;
Of the channels whose channel numbers are stored in the storage means, the channel numbers assigned to the channels associated with the plurality of channel keys for each region correspond to the numbers assigned to the plurality of channel keys. A channel whose channel number is indicated in the indicated area code is associated with the channel key according to the area code, and a channel whose channel number is not indicated in the area code is assigned to the channel key in the channel key. A channel setting method comprising: associating with a channel key that is not associated with each other. 10. The channel setting method according to claim 9, wherein the area code indicates the radio field intensity of the channel corresponding to the channel number. In the associating step, among the channels whose channel numbers are stored in the storage means, the channel whose channel number is stored in the area code is associated with the channel key according to the area code, and then the area code is stored. From the channels whose channel numbers are not stored in the channel keys, in order from the highest electric field strength, select a channel equal to or less than the number of channel keys not associated with the channel of the channel selection means. The channel setting method according to claim 10, wherein the channels are associated with channel keys not associated with each other. In the associating step, among the channels whose channel numbers are stored in the storage means, the channels whose channel numbers are not stored in the area code are not correlated in descending order of electric field strength. Select a channel equal to or less than the number of channel keys, compare the channel number assigned to the selected channel with the number assigned to the channel key that is not associated with the channel key, and 12. The channel setting method according to claim 11, wherein a channel to which a matching channel number is assigned is associated with a channel key to which a matching number is assigned. The channel setting method according to claim 11, further comprising: a radio wave intensity adjustment step of adjusting the radio wave intensity of the channel stored in the storage unit. A receiving step for receiving a signal transmitted from a broadcasting station;
A signal selection step of selecting and outputting a signal of a channel selected by selecting the channel key from the signals received in the reception step;
14. The channel setting method according to claim 13, wherein in the radio wave intensity adjusting step, the intensity of the signal output in the signal selecting step is adjusted. The channel setting method according to claim 14, wherein, in the radio wave intensity adjusting step, the radio wave intensity of the channel is adjusted for each frequency band. The channel selection device includes display means for displaying an image,
In the display means, the channel number and the electric field strength are stored in the detection channel storage means, and the channels not associated with the channel key are displayed on the display means in the order of the electrolytic strength. The channel setting method according to claim 9, further comprising a display step.

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