JP2005318277A - Preset method and tuning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preset method and a tuning device for shortening a time required for a preset operation. <P>SOLUTION: A control part 20 controls a second tuner 13-2 to detect a tuning frequency. Also, the control part 20 controls a first tuner 13-1 to perform reception operation with the tuning frequency detected by the second tuner 13-2, and a determination part 17 determines a television broadcasting system. The determination of the television broadcasting system is operated in parallel with the detection of the tuning frequency, and the detection result of the tuning frequency is associated with the determination result of the television broadcasting system with the detected tuning frequency, and stored as preset information in a nonvolatile memory 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a preset method and a channel selection device. Specifically, using a plurality of receiving means capable of supporting a plurality of television broadcasting systems, one of the plurality of receiving means is controlled to detect the channel selection frequency, and the other receiving by the plurality of receiving means is performed. Control means to perform reception operation at the detected channel selection frequency, to determine the television broadcasting system at the detected channel selection frequency in parallel with the channel selection frequency detection, The discrimination result of the television broadcasting system at the detected channel selection frequency is associated with each other and stored as preset information in the storage means.

  In the television broadcasting system, a television system and a color system are defined for each country. For example, in the Japanese television broadcasting system, the M system is used as the television system, and the NTSC system is used as the color system. In the UK, the I system is used as the television system, and the PAL system is used as the color system. In France, the L system is used as a television system and the SECAM system is used as a color system. For this reason, television receivers that can be used worldwide are automatically set in accordance with the television broadcast system so that a broadcast program can be viewed even when the television broadcast system is different.

  The setting according to the television broadcasting system is performed based on channel information accumulated in the storage device by performing a preset operation in advance. For example, as disclosed in Patent Document 1, in the preset operation, the channel selection frequency is fixed at a position where the carrier wave intensity is maximum using the A system tuner, and the video intermediate frequency signal and audio intermediate signal obtained at this time are fixed. The television broadcasting system is determined based on the frequency signal. The channel selection frequency information and the television broadcast system information are stored in the storage device as channel information of one position in the reception channel. Further, the channel selection frequency is automatically switched to determine the television broadcasting system in the same manner, and channel information for each position is accumulated in the storage device. After that, when displaying the program on the main screen and the sub screen respectively, the channel information corresponding to the main screen is read from the storage device, and the channel information read out is used to control the A system tuner and the A system processing circuit. The main screen program is displayed. Also, channel information corresponding to the sub screen is read from the storage device, and the B channel tuner and the B system processing circuit are controlled using the read channel information to display the sub screen program.

Japanese Patent No. 2906462

  By the way, if it is assumed that the channel selection frequency is detected and the television broadcast system is sequentially determined using the A system tuner as described above, it takes time to complete the preset operation. In particular, when the determination of the television broadcasting system is performed with high accuracy, it takes more time since the determination is performed after the video intermediate frequency signal and the audio intermediate frequency signal are in a stable signal state.

  Therefore, the present invention provides a preset method and a channel selection device that can reduce the time required for the preset operation.

  The preset method according to the present invention uses a plurality of receiving means capable of supporting a plurality of television broadcasting systems, and controls a receiving means in the plurality of receiving means to detect a tuning frequency, and a plurality of receiving means. A procedure for performing reception operation at the selected channel frequency by controlling other receiving units in the receiving unit, and performing a determination of the television broadcasting system at the detected channel selection frequency in parallel with the detection of the channel selection frequency; A procedure for associating the detection result of the channel selection frequency with the discrimination result of the television broadcasting system at the detected channel selection frequency and storing it in the storage means as preset information.

  Further, the channel selection device according to the present invention controls a plurality of receiving means capable of supporting a plurality of television broadcasting systems, a broadcasting system determining means for determining a television broadcasting system, and any receiving means in the plurality of receiving means. Channel selection frequency detection for detecting the channel selection frequency, and receiving operation at the channel selection frequency detected by controlling other reception means in the plurality of reception means, and television broadcasting at the detected channel selection frequency The control means for performing the television broadcast system determination in parallel with the broadcast system determination means, and the detection result of the channel selection frequency and the determination result of the television broadcast system at the detected channel selection frequency, It has a memory | storage means to memorize | store as preset information.

  According to the present invention, the channel selection frequency is detected by controlling any one of the plurality of receiving means capable of supporting a plurality of television broadcasting systems. Further, the receiving operation is performed at the detected channel selection frequency by controlling other receiving units in the plurality of receiving units, and the determination of the television broadcasting system at this channel selection frequency is performed in parallel with the channel selection frequency detection. As a result, the detection result of the channel selection frequency and the discrimination result of the television broadcasting system at the detected channel selection frequency are associated and stored as preset information. For this reason, the preset operation can be completed efficiently in a short time.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of the channel selection device. The broadcast signal received by the antenna 11 is supplied by the distributor 12 to a plurality of receiving means, for example, the first tuner 13-1 and the second tuner 13-2. The plurality of receiving means have the same reception frequency band, and signals received by any of the receiving means can be received by other receiving means.

  The first tuner 13-1 controls the local oscillation frequency based on the channel selection signal TC-1 from the control unit 20, which will be described later, and varies the frequency of the signal to be selected. Also, the frequency of the selected signal is converted to an intermediate frequency to generate a video intermediate frequency signal. Further, the generated video intermediate frequency signal is amplified and supplied to the video processing unit 14-1, the audio processing unit 15, and the determination unit 17. Further, the first tuner 13-1 has an automatic fine adjustment signal AFT-1 having a signal level corresponding to an error between the video carrier frequency defined in the broadcasting system and the video carrier frequency extracted from the video intermediate frequency signal VIF-1. Is generated and supplied to the control unit 20.

  The video processing unit 14-1 performs video detection and generates a color television signal. Using this generated color television signal, video processing such as brightness adjustment and contrast adjustment and color reproduction processing such as color demodulation are performed, and the display signal DR-1 is converted using the signal after video processing and the signal after color reproduction processing. It is generated and supplied to the multi-screen display processing unit 16. Further, the video processing unit 14-1 separates the synchronization signal SYN from the color television signal and supplies it to the determination unit 17 and the control unit 20. In addition, the video processing unit 14-1 constitutes a broadcast system determination unit, and determines the color system of the generated color television signal and supplies a color system determination signal SD indicating the determination result to the control unit 20. . The determination of the color method can be performed by using, for example, a method disclosed in Japanese Patent Laid-Open No. 7-23408. Note that the video processing unit 14-1 performs a filtering process or the like according to the television broadcasting system based on the broadcasting system control signal TS-1 supplied from the control unit 20, and corrects even if the television broadcasting system is different. A display signal DR-1 is generated.

  The sound processing unit 15 performs sound detection based on the broadcast system control signal TS-1 from the control unit 20 to generate a sound intermediate frequency signal, and FM detects this sound intermediate frequency signal to generate a sound signal. The audio processing unit 15 amplifies the audio signal to a desired signal level and outputs it as an audio output signal Sout. The sound processing unit 15 supplies the generated sound intermediate frequency signal SIF to the determination unit 17. Furthermore, the audio processing unit 15 performs a filtering process corresponding to the television broadcasting system based on the broadcasting system control signal TS-1 supplied from the control unit 20, and correctly outputs the audio output signal even when the television broadcasting system is different. Sout is generated.

  The second tuner 13-2 controls the local oscillation frequency based on the channel selection signal TC-2 from the control unit 20, which will be described later, and varies the frequency of the signal to be selected. Further, the frequency of the selected signal is converted into an intermediate frequency to generate a video intermediate frequency signal. Further, the generated video intermediate frequency signal is amplified and supplied to the video processing unit 14-2. Further, the second tuner 13-2 has an automatic fine adjustment signal AFT-2 having a signal level corresponding to an error between the video carrier frequency defined in the broadcasting system and the video carrier frequency extracted from the video intermediate frequency signal VIF-2. Is generated and supplied to the control unit 20.

  The video processing unit 14-2 performs video detection and generates a color television signal. The generated color television signal is used to perform video processing such as brightness adjustment and contrast adjustment and color reproduction processing such as color demodulation, and the display signal DR-2 is generated using the signal after video processing and the signal after color reproduction processing. It is generated and supplied to the multi-screen display processing unit 16. Note that the video processing unit 14-2 performs filter processing or the like according to the television broadcasting system based on the broadcasting system control signal TS-2 supplied from the control unit 20, and even if the television broadcasting system is different, A display signal DR-2 is generated.

  The multi-screen display processing unit 16 switches the display mode based on the display setting signal HS supplied from the control unit 20. For example, when the multi-screen display mode is set, the display signal DR- is used by using the display signal DR-1 supplied from the video processing unit 14-1 and the display signal DR-2 supplied from the video processing unit 14-2. A display output signal DRout for simultaneously displaying a video based on 1 and a video based on the display signal DR-2 on one screen is generated and output. When the single screen display mode is set, the display output signal for displaying only the video based on the display signal DR-1 on the screen using the display signal DR-1 supplied from the video processing unit 14-1. Generate and output DRout.

  The discriminating unit 17 constituting the broadcasting system discriminating means discriminates the television system based on the video intermediate frequency signal VIF-1, the audio intermediate frequency signal SIF and the synchronization signal SYN, and generates a television system discrimination signal SE indicating the discrimination result. To the control unit 20. For example, the television system is detected based on the frequency difference between the video intermediate frequency signal VIF-1 and the audio intermediate frequency signal SIF. Further, it is determined whether or not the detection result is correct depending on whether or not the field frequency of the determined television system matches the frequency of the vertical synchronizing signal included in the synchronizing signal SYN. Detect again. The detection of the television system can be performed by sequentially switching and setting the television system to detect the noise level, and the television system when the noise level is minimized can be used as the detection result.

  A user interface 21 is connected to the control unit 20. The user interface 21 includes an operation unit that is operated by a viewer, a control signal receiving unit that receives a remote control signal, and the like, and generates and controls an operation signal PS based on the user operation and the remote control signal. To the unit 20.

  The control unit 20 is configured using a microcomputer or the like, and selects the channel selection frequency of the broadcast signal received based on the operation signal PS from the user interface 21 or preset information stored in the nonvolatile memory 22 described later. Corresponding channel selection signals TC-1 and TC-2 are generated and supplied to the first tuner 13-1 and the second tuner 13-2. In addition, broadcast system control signals TS-1 and TS-2 corresponding to the television broadcast system of the broadcast signal received based on the preset information MF are generated and transmitted to the video processing units 14-1 and 14-2 and the audio processing unit 15. Supply. Moreover, the control part 20 performs preset operation | movement, and makes the determination of the television broadcasting system in the detection of the tuning frequency and the detected tuning frequency in parallel. In the determination of the television broadcast system, the color system determination signal SD supplied from the video processing unit 14-1 and the TV system determination signal SE supplied from the determination unit 17 when the reception operation is performed at the detected channel selection frequency. Is used as a discrimination result of the television broadcasting system. Further, the control unit 20 associates the detected channel selection frequency with the determination result of the television broadcasting system, and stores it in the nonvolatile memory 22 as the preset information MF.

  The nonvolatile memory 22 stores information and the like necessary for controlling the operation of each unit by the control unit 20. For example, preset information MF used at the time of channel selection, last channel information indicating a channel that was viewed at the end of the operation, various setting information indicating a display mode, a setting state related to video and audio, and the like are stored.

  Next, the preset operation will be described. FIG. 2 is a flowchart showing the preset operation. In step ST1, the control unit 20 initializes parameters. In the initialization of this parameter, the parameter Fset for setting the channel to be selected is set to the frequency f0 of the first channel selection channel. Here, the frequency f0 is, for example, the lowest frequency in the reception frequency band of the first tuner 13-1 and the second tuner 13-2. Also, the parameter CHs indicating the channel number is set to “−1”, the parameter CHf is set to “0”, and the parameter CHend indicating the last channel number is set to the maximum value of the number of storable channels, for example “255”.

  In step ST2, the control unit 20 activates the first task shown in the flowchart of FIG. In step ST3, the control unit 20 activates the second task shown in the flowchart of FIG.

  In the first task of FIG. 3, in step ST11, the control unit 20 generates a channel selection signal TC-2 based on the parameter Fset and supplies the channel selection signal TC-2 to the second tuner 13-2. I do.

  In step ST12, the control unit 20 waits for a predetermined time, and proceeds to step ST13 after the reception operation based on the channel selection signal TC-2 becomes stable.

  In step ST13, the control unit 20 determines whether or not a broadcast signal is detected. When the broadcast signal is detected, the control unit 20 proceeds to step ST14, and when the broadcast signal is not detected, the process proceeds to step ST16. Whether or not a broadcast signal has been detected can be determined using the synchronization signal SYN supplied from the video processing unit 14-2 or the automatic fine adjustment signal AFT-2 from the second tuner 13-2. For example, it is determined that the broadcast signal is detected when the synchronization signal SYN is supplied from the video processing unit 14-2, and that the broadcast signal is not detected when the synchronization signal SYN is not supplied. When the automatic fine adjustment signal AFT-2 is stable with a small error between the video carrier frequency defined in the broadcasting system and the video carrier frequency extracted from the video intermediate frequency signal VIF-2, When the signal is detected and is not stable, it is determined that the broadcast signal is not detected.

  In step ST14, the control unit 20 adds “1” to the parameter CHs, and proceeds to step ST15 with the addition result as a new value of the parameter CHs.

  In step ST15, the control unit 20 sets the frequency indicated by the parameter Fset as the channel selection frequency of the preset information MF (CHs) for the channel number having the value indicated by the parameter CHs. Further, the tuning frequency of the preset information MF (CHs) is stored in the nonvolatile memory 22.

  In step ST16, the control unit 20 determines whether or not the parameter Fset is the frequency fend of the last channel that can be received. Here, when the parameter Fset is not the frequency fend of the final channel, the process proceeds to step ST17. If the frequency fend of the final channel is reached, the process proceeds to step ST18.

  In step ST17, the control unit 20 adds the frequency variable amount fd to the parameter Fset, and returns the addition result as a new value of the parameter Fset to step ST11.

  In step ST18, the control unit 20 sets the value indicated by the parameter CHs as a new value of the parameter CHend since the parameter Fset is set to the frequency fend of the final channel and the detection of the broadcast signal is completed up to the final channel. End the first task.

  In the second task of FIG. 4, the control unit 20 is a flowchart showing the second task in the preset operation. In step ST21, the control unit 20 determines whether or not the value of the parameter CHf is larger than the value of the parameter CHend. Here, when the value of the parameter CHf is not larger than the value of the parameter CHend, the process proceeds to step ST22, and when it is larger, the second task is terminated.

  In step ST22, the control unit 20 determines whether or not the value of the parameter CHf is larger than the value of the parameter CHs. Here, when the value of the parameter CHf is larger than the value of the parameter CHs, the process returns to step ST21, and when not, the process proceeds to step ST23.

  In step ST23, the control unit 20 reads the channel selection frequency of the preset information MF (CHf) from the non-volatile memory 22, and generates the channel selection signal TC-1 so as to receive the signal of the read channel selection frequency. This is supplied to the first tuner 13-1.

  In step ST24, the control unit 20 waits for a predetermined time, and proceeds to step ST25 after the reception operation based on the channel selection signal TC-1 becomes stable. In step ST25, the control unit 20 determines the broadcast method based on the method determination signal SD from the determination unit 17 and the synchronization signal SYN-1 from the video processing unit 14-1, and proceeds to step ST26.

  In step ST26, the control unit 20 sets the determination result DS in step ST25 as the television broadcast system of the preset information MF (CHf) for the channel number having the value indicated by the parameter CHf. Further, the television broadcast system of the preset information MF (CHf) is stored in the nonvolatile memory 22. For this reason, in the preset information MF stored in the non-volatile memory 22, the detected channel selection frequency is associated with the discrimination result of the television broadcast system at this channel selection frequency.

  In step ST27, the control unit 20 adds “1” to the parameter CHf, and returns the addition result as a new value of the parameter CHf to step ST21.

  FIG. 5 is a diagram for explaining the preset operation. FIG. 5A shows the channel selection operation of the second tuner 13-2, and FIG. 5B shows the channel selection operation of the first tuner 13-1. 5C shows the parameter CHs, FIG. 5D shows the parameter CHf, and FIG. 5E shows the parameter CHend.

  When the preset operation is started at time t0, the parameter Fset is set to “f0”. Further, the first task is activated to generate a channel selection signal TC-2 based on the parameter Fset and start the channel selection operation of the second tuner 13-2.

  A broadcast signal is detected after a lapse of a predetermined time from time t0, and when the broadcast signal is not detected, the frequency variable amount fd is added to the parameter Fset, and the frequency as the addition result is updated to a new value of the parameter Fset. Further, a channel selection signal TC-2 is generated based on the updated parameter Fset and supplied to the second tuner 13-2 to perform a channel selection operation.

  Thereafter, the parameter Fset is sequentially updated to detect the broadcast signal. When the broadcast signal is detected at the time t1, “1” is added to the parameter CHs, and the addition result is set to a new value of the parameter CHs. . Therefore, as shown in FIG. 5C, the value of the parameter CHs is updated from “−1” to “0” at the time point t1. Further, the parameter Fset (= f1) at this time is stored in the nonvolatile memory 22 as the channel selection frequency of the preset information MF (0). FIG. 6 shows preset information stored in the nonvolatile memory 22.

  Thereafter, when a broadcast signal can be detected at time t3, “1” is added to the parameter CHs, and the addition result is set to a new value of the parameter CHs. Therefore, the value of the parameter CHs is updated from “0” to “1” at time t3. Further, the parameter Fset (= f2) at this time is stored in the nonvolatile memory 22 as the channel selection frequency of the preset information MF (1).

  Similarly, the broadcast signal is detected, and when the broadcast signal is detected, the parameter CHs is updated and the channel selection frequency is stored. Thereafter, when the broadcast signal can be detected at time t5, “1” is added to the parameter CHs, and the addition result is set to a new value of the parameter CHs. Therefore, the value of the parameter CHs is updated from “n−2” to “n−1” at time t5. Further, the parameter Fset (= fn) at this time is stored in the nonvolatile memory 22 as the channel selection frequency of the preset information MF (n-1).

  When the parameter Fset is set to “fend” and the detection of the broadcast signal is completed at time t7, the value of the parameter CHs is set as a new value of the parameter CHend, and then the first task is terminated and the second tuner The tuning operation is terminated. Therefore, the parameter CHend shown in FIG. 5E is updated from “255” to “n−1” at time t7.

  When the second task is activated after the first task is activated at time t0, the channel selection frequency indicated by the preset information MF (0) is determined at time t1 when it is determined that the parameter CHf is not larger than the parameter CHs. A channel selection signal TC-1 is generated and supplied to the first tuner 13-1 so as to perform the reception operation at "f1".

  When the television broadcast system of the channel having the channel selection frequency “f1” is determined after a predetermined time from the time t1, and the determination is completed at the time t2, the determination result DS1 at this time is the television broadcast system of the preset information MF (0). It is stored in the nonvolatile memory 22. Also, the value of the parameter CHf is updated from “0” to “1”.

  When the parameter CHs is updated from “0” to “1” at time t3 and it is determined that the parameter CHf is not larger than the parameter CHs, the channel selection frequency “f1” indicated by the preset information MF (1) is used. A channel selection signal TC-1 is generated and supplied to the first tuner 13-1 so as to perform the reception operation.

  Further, when the television broadcast system of the channel having the channel selection frequency “f2” is determined after a predetermined time from the time point t3 and the determination is completed at the time point t4, the determination result DS2 at this time is the television broadcast of the preset information MF (1). The method is stored in the nonvolatile memory 22. Further, the value of the parameter CHf is updated from “1” to “2”.

  Thereafter, a broadcast signal is received at the channel selection frequency indicated by the preset information MF (CHs) stored in the nonvolatile memory 22 in the same manner, and the preset information MF corresponding to the determination result DS of the television broadcast system corresponds. Stored in (CHs). For example, after a predetermined time has elapsed from time t5, the television broadcast system of the channel with the channel selection frequency “fn” is determined, and when the determination is completed at time t6, the determination result DSn at this time is the preset information MF (n−1). It is stored in the nonvolatile memory 22 as a television broadcast system. Further, the value of the parameter CHf is updated from “n−1” to “n”.

  When the detection of the broadcast signal is completed at time t7 and the parameter CHend is updated from “255” to “n−1”, the second task is terminated because the parameter CHf becomes larger than the parameter CHend. The tuning operation of one tuner is finished.

  Thus, the channel selection frequency of the broadcast signal is detected using the second tuner, and the detected channel selection frequency is stored in the nonvolatile memory 22 as preset information MF for each channel. Also, the determination of the television broadcast system for the channel of the stored channel selection frequency is performed in parallel with the detection of the channel selection frequency using the first tuner.

  As described above, since the detection of the channel selection frequency and the determination of the television broadcasting system are performed in parallel using different tuners, the preset operation can be completed automatically and efficiently in a short time.

  In the above-described embodiment, the case where the tuning frequency is detected and the television broadcasting system is determined in parallel using two tuners is shown. However, when three or more tuners are used, the tuning frequency is detected. The preset operation can be performed more efficiently if it is performed by sharing with a plurality of tuners, or if the determination of the television broadcasting system is performed by sharing with a plurality of tuners. For example, when the preset operation is performed using three tuners, if the time required for determining the television broadcasting system is long, the tuning frequency is detected by one tuner and the television broadcasting system is determined by two tuners. Here, when the two broadcast tuners determine the television broadcast system, the tuners determine the television broadcast system for channels having different channel selection frequencies. When the time required for detecting the channel selection frequency is long, the channel selection frequency is detected by two tuners, and the television broadcast system is determined by one tuner. Here, when the tuning frequency is detected by the two tuners, each tuner is controlled to perform the tuning operation at a different frequency. For example, one tuner detects a channel selection frequency from the lowest frequency in the tuner reception frequency band, and the other tuner detects a channel selection frequency from the highest frequency in the reception frequency band. In this way, even when three or more tuners are used, the preset operation is automatically made more efficient by operating each tuner in parallel to detect the channel selection frequency and determine the television broadcasting system. It can often be completed in a short time.

  As described above, the channel preset method and the channel selection device according to the present invention are useful in a device having a plurality of receiving means, and are suitable for, for example, a television receiver that can be used worldwide.

It is a figure which shows the structure of a channel selection apparatus. It is a flowchart which shows a preset operation | movement. It is a flowchart which shows a 1st task. It is a flowchart which shows a 2nd task. It is a figure for demonstrating preset operation | movement. It is a figure which shows preset information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Antenna, 12 ... Distributor, 13-1 ... 1st tuner, 13-2 ... 2nd tuner, 14-1, 14-2 ... Image processing part, 15 ... Voice processing unit, 16 ... multi-screen display processing unit, 17 ... discriminating unit, 20 ... control unit, 21 ... user interface, 22 ... nonvolatile memory

Claims (2)

Using a plurality of receiving means capable of supporting a plurality of television broadcasting systems, a procedure for detecting a tuning frequency by controlling any receiving means in the plurality of receiving means,
The other receiving means in the plurality of receiving means are controlled to perform a receiving operation at the detected channel selection frequency, and the determination of the television broadcasting system at the detected channel selection frequency is performed in parallel with the detection of the channel selection frequency. And the steps to do
A preset method comprising: a step of associating a detection result of the channel selection frequency with a discrimination result of the television broadcast system at the detected channel selection frequency and storing it in a storage means as preset information. A plurality of receiving means capable of supporting a plurality of television broadcasting systems;
A broadcasting system discriminating means for discriminating a television broadcasting system;
A tuning frequency detection for detecting a tuning frequency by controlling any receiving means in the plurality of receiving means, and a tuning frequency detected by controlling another receiving means in the plurality of receiving means. A control means for performing a reception operation and performing a television broadcast system determination in parallel with the broadcast system determination means for determining the television broadcast system at the detected channel selection frequency;
A channel selection apparatus, comprising: a storage unit configured to store the detection result of the channel selection frequency and the determination result of the television broadcast system at the detected channel selection frequency as preset information.

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