JP2009055460A - Broadcast receiver and antenna level display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and efficiently perform installation work or re-adjustment work of an antenna. <P>SOLUTION: A tuner unit 12 selects a desired channel from a received broadcast signal and outputs a received signal RS. A digital demodulation unit 13 performs demodulation processing on the received signal RS and outputs a transport stream TSr. An error-correcting processing unit 14 performs error correction on the stream TSr, and a packet of image or audio of a desired program is extracted by a demultiplexer 15 and decoded by a decoder unit 21. The digital demodulation unit 13 or the error-correcting processing unit 14 supplies an antenna level to a control unit 50. The control unit 50 sequentially iteratively switches the channel to be selected by the tuner unit 12 and acquires the antenna level for each channel. Furthermore, an on-screen display processing unit 32 is controlled to display a list of antenna levels of channels on a screen of a display unit 60. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a broadcast receiving apparatus and an antenna level display method. Specifically, the antenna level in each channel can be easily confirmed when performing antenna installation work, readjustment work, or the like.

  When a broadcast signal is received, the antenna level varies greatly depending on the direction of the antenna. For this reason, for example, when an antenna is installed, the antenna level is displayed on the broadcast receiving apparatus so that the antenna level can be easily known. For example, in the invention of Patent Document 1, a signal component proportional to the C / N of the intermediate frequency signal is separated into a DC signal, and the level of the DC signal is displayed based on the obtained DC signal. The antenna level is displayed quantitatively and accurately. In the invention of Patent Document 2, the C / N ratio based on the average value of the signal point fluctuation width and the C / N ratio value based on the error rate are measured and displayed from these two C / N ratios. The C / N ratio to be determined is determined and adaptively switched and displayed.

JP-A-6-224793 JP 2003-230070

  By the way, the conventional antenna level display screen is configured as shown in FIG. 4, for example, and a transmission channel (also referred to as a frequency channel or a physical channel) selected by the tuner unit and a three-digit channel number (organization) indicating a service. Channel number), the currently received broadcast, the maximum and current values of the antenna level, and a bar display indicating the current antenna level. The beep sound is a display indicating whether or not the beep sound whose frequency is changed according to the antenna level is set. In such a conventional antenna level display, the antenna level of one selected transmission channel is displayed.

  Also, when performing antenna installation work or readjustment work, even if the antenna was set so that the antenna level of the selected channel was maximized, the antenna level decreased when other channels were selected. It may become a state. For example, in the case of terrestrial broadcasting, the antenna level may increase due to a reflected wave of a building or the like even if the antenna is not directed to the transmitting station. In such a case, since the direction of the antenna does not face the direction of the transmitting station, even if the antenna level of the selected channel is maximized, the antenna level is lowered in other channels. .

  Therefore, in order to set the antenna so that the antenna level is good in any channel, it is necessary to confirm the antenna level of each channel by performing a channel switching operation. Here, in the channel switching operation, for example, as shown in FIG. 5, after the transmission channel display HB is selected to enable the transmission channel switching operation, the channel up operation and the channel down operation must be performed. The antenna level of each channel cannot be confirmed.

  Also, if the number of channels increases, unless the antenna level is recorded, it becomes impossible to know how much the antenna level of each channel was.

  Furthermore, when the antenna level is not good, the direction of the antenna should be readjusted and the transmission channel must be switched again to check whether the antenna level is good for each channel. The installation work and readjustment work are very complicated.

  Therefore, the present invention provides a broadcast receiving apparatus and an antenna level display method capable of easily and efficiently performing antenna installation work and readjustment work.

  The concept of the present invention is to measure an antenna level for each channel selected by a tuner unit and generate a display signal for displaying a list of measured antenna levels for each channel.

  The broadcast receiving apparatus according to the present invention is a broadcast receiving apparatus that receives a television broadcast. A tuner unit that selects a desired channel from a received broadcast signal, and an antenna based on a channel signal that is selected by the tuner unit. The measurement unit for measuring the level, the display processing unit for generating a display signal for displaying the antenna level, and the channel selected by the tuner unit are sequentially switched, and the antenna level for each channel is measured by the measurement unit. And a control unit that causes the display processing unit to generate a display signal for displaying a list of antenna levels for each channel.

  Further, an antenna level display method according to the present invention is the antenna level display method of a broadcast receiving apparatus that receives a television broadcast. In the channel selection step of selecting a desired channel from the received broadcast signal, the channel selection step includes: A measurement step for measuring an antenna level based on a signal of a selected channel and a display signal generation step for generating a display signal for displaying the antenna level are provided, and a channel to be selected in the channel selection step is determined. By sequentially switching and measuring the antenna level for each channel in the measurement step, a display signal for displaying a list of the antenna levels for each channel is generated in the display signal generation step.

  According to the present invention, since a display signal for displaying a list of antenna levels for each channel is generated, antenna installation work and readjustment work can be performed by displaying a list of antenna levels for each channel based on this display signal. It becomes possible to carry out easily and efficiently.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the broadcast receiving apparatus.

  The antenna 11 of the broadcast receiving apparatus 10 supplies a broadcast signal RF obtained by receiving a television broadcast to the tuner unit 12. The tuner unit 12 supplies a reception signal RS obtained by selecting a desired channel to the digital demodulation unit 13.

  The digital demodulator 13 performs demodulation processing corresponding to the modulation method used in television broadcasting, for example, QFDM demodulation processing, QPSK demodulation processing, QAM demodulation processing, and the like, and errors the transport stream TSr that is the obtained demodulated signal. This is supplied to the correction processing unit 14. Further, the digital demodulator 13 calculates an average value of the fluctuation width for the signal points indicated by the signal components in the I-axis direction and the Q-axis direction obtained by performing QPSK demodulation processing or QAM demodulation processing, etc. Can be supplied to. The amplitude of the signal point increases when the C / N ratio (Carrier to Noise ratio) deteriorates. Here, if the relationship between a signal that is preliminarily superimposed with random noise and modulated to a C / N ratio of an arbitrary strength and the average value of the amplitude when the modulated signal is demodulated is obtained, The digital demodulator 13 can obtain the C / N ratio from the average value of the amplitude. Therefore, the digital demodulator 13 obtains the C / N ratio from the average value of the amplitude, replaces this C / N ratio with the antenna level La, and supplies it to the controller 50.

  The error correction processing unit 14 performs error correction processing of the transport stream TSr and supplies the transport stream TSs subjected to error correction to the demultiplexer 15. Further, the error correction processing unit 14 calculates an error rate by comparing the transport stream TSr before error correction processing and the transport stream TSs after error correction processing, and replaces this error rate with the antenna level Lb for control. You may comprise so that the control part 50 can be supplied to the part 50. FIG.

  The demultiplexer 15 separates the image signal DTv and the audio signal DTa that have been time-division multiplexed on the transport stream TSs and supplies them to the decoder unit 21. Also, the channel selection information for selecting a program and the information signal DTc and the data broadcast signal DTd having program information related to the program are separated and supplied to the control unit 50.

  The decoder unit 21 decodes the image signal DTv supplied from the demultiplexer 15 and supplies the obtained image signal VSa to the image switching unit 31. The decoder unit 21 decodes the audio signal DTa and supplies the obtained audio signal Asa to the audio switching unit 41.

  The image switching unit 31 is connected to an input terminal 22, and an image of a composite method, a component method, an HDMI (High Definition Multimedia Interface) method, a DVI (Digital Visual Interface) method, or the like is received from an external device via the input terminal 22. A signal can be input. Further, an on-screen display processing unit 32 is connected to the image switching unit 31, and the image switching unit 31 receives the image signal VSa supplied from the decoder unit 21 or the image signal VSb supplied via the input terminal 22. Either one is selected and supplied to the on-screen display processing unit 32 as an image signal VSc.

  The on-screen display processing unit 32 generates an on-screen display signal such as a menu screen based on a control signal CT from the control unit 50 described later. Further, the on-screen display signal and the image signal VSc supplied from the image switching unit 31 are combined to generate an image signal VSd of an image in which an image based on the on-screen display signal is combined with an image based on the image signal VSc. This is supplied to the processing unit 33.

  The signal processing unit 33 performs interlace / progressive conversion (I / P conversion) processing, pixel number conversion processing, and the like as necessary using the image signal VSd supplied from the on-screen display processing unit 32. Further, the processed image signal is subjected to image quality improvement processing such as sharpness correction, hue correction, white balance correction, and noise removal, and is supplied to the image output processing unit 34 as the image signal VSe.

  Connected to the image output processing unit 34 is a display unit 60 configured using a display device such as an LCD (Liquid Crystal Display), a PDP (Plasma Display Panel), an EL (Electro Luminescence), or a cathode ray tube. The image output processing unit 34 generates a display drive signal DRv for driving the display device based on the image signal VSe and supplies the display drive signal DRv to the display unit 60. For this reason, an image can be displayed on the display unit 60. Further, when the image output processing unit 34 supplies an image signal to an external device (not shown), the image output processing unit 34 outputs the image signal VSe as an output signal Vout having a format corresponding to the external device.

  An input terminal 23 is connected to the audio switching unit 41, and an audio signal ASc can be input from an external device via the input terminal 23. In addition, the audio switching unit 41 is connected to the audio output processing unit 42, and the audio switching unit 41 is either the audio signal ASa supplied from the decoder unit 21 or the audio signal ASb supplied via the input terminal 23. Is selected and supplied to the audio output processing unit 42 as an audio signal ASc.

  An audio output unit 65 configured using a speaker is connected to the audio output processing unit 42. The audio output processing unit 42 performs audio processing such as signal level adjustment, sound quality adjustment, noise removal processing, and the like using the audio signal ASc supplied from the audio switching unit 41, and outputs the audio output signal DRa after the audio processing to the audio output unit. The sound is output to 65. Further, when the audio output processing unit 42 supplies an audio signal to an external device (not shown), the audio output processing unit 42 outputs the signal after the audio processing as an output signal Aout having a format corresponding to the external device.

  A user interface unit 51 and a storage unit 52 are connected to the control unit 50. The user interface unit 51 supplies an operation signal PS corresponding to a user operation to the control unit 50, and includes, for example, an operation key and a remote control signal receiving unit.

  The storage unit 52 stores the information signal DTc separated by the demultiplexer 15. In addition, when the antenna is installed, the antenna level of each channel is stored.

  The control unit 50 is connected to each unit described above via the bus 55. The control unit 50 generates a control signal CT based on the operation signal PS from the user interface unit 51 and supplies the control signal CT to each unit, thereby controlling the operation of the broadcast receiving apparatus to be an operation corresponding to the user operation. For example, when the operation signal PS supplied from the user interface unit 51 indicates that a signal switching operation such as channel switching or input switching has been performed, the control unit 50 is supplied from a desired channel or from the outside. The tuning operation of the tuner unit 12, the decoding process of the decoder unit 21, the switching operation of the image switching unit 31 and the audio switching unit 41, and the like are controlled so that image / sound presentation can be performed. For example, using the channel selection information stored in the storage unit 52, the tuner unit 12 performs channel selection control based on the frequency information and the demultiplexer 15 performs packet separation control based on the table information. Thus, it becomes possible to select a desired program and to generate an image signal and an audio signal of the selected program. In addition, by controlling the switching operation of the image switching unit 31 and the audio switching unit 41, it is possible to perform not only television broadcasting but also image display based on the image signal supplied from the input terminal 22. In addition, the on-screen display processing unit 32 is controlled to display an electronic program guide, search for programs, make reservations, confirm contents, etc., and display data broadcast images based on the data broadcast signal DTd.

  Further, when the antenna level display mode is selected by the operation signal PS supplied from the user interface unit 51, the control unit 50, the tuner unit 12, the digital demodulation unit 13, the error correction processing unit 14, and the on-screen display processing unit 32. Is controlled to display a list of the antenna levels of each channel on the screen of the display unit 60, for example.

  Next, the antenna level display operation will be described with reference to the flowchart of FIG. In step ST1, the control unit 50 determines whether or not the antenna level display mode is selected. The control unit 50 proceeds to step ST2 when the antenna level display mode is set, and performs other operations without performing the antenna level display operation when the antenna level display mode is not set.

  In step ST2, the control unit 50 selects the first channel. When the user first performs an operation on the broadcast receiving device, the broadcast receiving device displays a region selection menu for selecting a region where the broadcast receiving device is used. Receivable channels can be automatically registered. In addition, a channel scan operation is performed so that a receivable channel can be detected and automatically registered. For this reason, the control unit 50 controls the tuner unit 12 to select the first registered channel, and proceeds to step ST3. When performing antenna level display while performing a channel scan operation, the process proceeds to step ST3 when the first channel is detected.

In step ST3, the control unit 50 performs antenna level measurement processing. The control unit 50 controls the digital demodulating unit 13 to calculate an average value of the fluctuation width for the signal point of the received signal. Further, the control unit 50 converts the calculated average value into the antenna level La and supplies it to the control unit 50. Further, the control unit 50 controls the error correction processing unit 14 to calculate an error rate. Further, the control unit 50 may adaptively switch between the antenna level La obtained from the average value of the amplitude and the antenna level Lb obtained from the error rate. The control unit 50 stores the antenna level in the storage unit 52 so that it is possible to identify which channel the antenna level is. When the antenna level is measured a plurality of times on the same channel, at least the maximum value of the antenna level and the latest antenna level are stored.
In the above-described embodiment, the antenna level is measured by the digital demodulation unit 13 and the error correction processing unit 14 and supplied to the control unit 50. However, the control unit 50 may be operated as a measurement unit. In other words, the average value of the fluctuation width from the digital demodulation unit 13 and the error rate from the error correction processing unit 14 may be supplied to the control unit 50, and the control unit 50 may calculate the antenna level. In this case, the configuration and processing of the digital demodulation unit 13 and the error correction processing unit 14 are facilitated.

  In step ST4, the control unit 50 performs list display processing. The control unit 50 reads out the antenna level of each channel stored in the storage unit 52 and controls the on-screen display processing unit 32 so that the antenna level of each channel can be confirmed simultaneously. For example, the display unit 60 The list of antenna levels for each channel is displayed on the screen. Also, when displaying the antenna level for each channel as a list, the antenna level of the currently selected channel can be distinguished from the antenna levels of other channels so that the antenna level of the currently selected channel can be identified. To display. For example, brightness, color, display size, etc. are displayed differently from other channels.

  In step ST5, the control unit 50 determines whether or not the antenna level display mode is ended. When the operation for ending the antenna level display mode is not performed, the control unit 50 proceeds to step ST6, and when the operation for ending the antenna level display mode is performed, the control unit 50 ends the antenna level display operation.

  In step ST6, the control unit 50 determines whether or not the channel is selected for the last channel. When the control unit 50 determines that the selected channel is the last preset channel, the control unit 50 returns to step ST2 and measures the antenna level again from the first channel. If the selected channel is not determined to be the last preset channel, the process proceeds to step ST7.

  In step ST7, the control unit 50 selects the next channel, returns to step ST3, and measures the antenna level for the newly selected channel.

  FIG. 3 illustrates an antenna level display screen displayed on the display unit 60 when the antenna level display operation is performed. In the antenna level list display, a predetermined number (for example, “12” in FIG. 3) of antenna level display areas HA-1 to HA-12 are provided. In the antenna display areas HA-1 to HA-12, the broadcasting system and the channel number, the maximum value of the measured antenna level, and the current antenna level that is the latest measured value of the antenna level are displayed. .

  If the antenna level display operation shown in FIG. 2 is performed, the preset antenna levels of the respective channels are sequentially displayed. Further, the antenna level of each channel is repeatedly measured, and the maximum value and the current value of the antenna level are displayed as a list.

  For example, in the antenna level display area HA1, the display “terrestrial D” indicating that the broadcasting system is terrestrial digital broadcasting, the display “011” indicating the channel number, the display “maximum: 43” indicating the maximum value of the antenna level, A display “present: 30” indicating the antenna level is provided. Also, in the antenna level display areas HA2 to HA9, the current value and the maximum value of each channel are displayed as in the antenna level display area HA1. In FIG. 3, since the number of preset channels is smaller than the number of antenna level display areas, the current value and the maximum value of the antenna level are set to “0” in the antenna level display areas HA10 to HA12.

  In this way, if the measurement results for each channel are displayed in a list on the antenna level display, it is easy to check whether the antenna level is good for each channel without switching the channel on the menu screen. Is possible. Therefore, antenna installation work and readjustment work can be easily performed. Further, since the maximum value and the current value are displayed in the antenna level display, the antenna installation work and readjustment work can be easily performed so that the antenna level of each channel is maximized. In addition, if a problem occurs in which the image of a specific channel is not displayed, simply select the antenna level display mode and easily check whether the antenna level is low overall or only the specific channel antenna level is low. Can do. Therefore, prompt service response is possible.

  In addition, when performing a channel scan operation to display a list of antenna levels of receivable channels, the antenna levels of channels that cannot be received are not displayed, so that the antenna levels can be displayed efficiently. If the list of antenna levels is updated by repeating the channel scan operation, when the number of receivable channels increases with the best antenna direction, the antenna level of the newly receivable channel is displayed. It becomes possible to do.

  In the above-described embodiment, the case where the television broadcast is a digital broadcast has been described. However, even if the television broadcast is an analog broadcast, a list of antenna levels may be displayed. In this case, for example, the control unit may read the set gain of an AGC circuit provided in the tuner unit 12 and keep the signal level of the reception signal RS constant, and convert the read set gain into an antenna level and display it.

It is a figure which shows the structure of a broadcast receiver. It is a figure which shows antenna level display operation | movement. It is a figure which shows the example of an antenna level display screen. It is a figure which shows the conventional antenna level display screen. It is a figure which shows the display screen in the case of knowing the antenna level of another channel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Broadcast receiving apparatus, 11 ... Antenna, 12 ... Tuner part, 13 ... Digital demodulation part, 14 ... Error correction processing part, 15 ... Demultiplexer, 21 ... Decoder , 22, 23... Input terminal, 31, image switching unit, 32, on-screen display processing unit, 33, signal processing unit, 34, image output processing unit, 41,. Voice switching unit, 42 ... voice output processing unit, 50 ... control unit, 51 ... user interface unit, 52 ... storage unit, 55 ... bus, 60 ... display unit, 65 · ..Audio output part

Claims (5)

In a broadcast receiving apparatus that receives a television broadcast,
A tuner unit that selects a desired channel from the received broadcast signal;
A measurement unit for measuring an antenna level based on a signal of a channel selected by the tuner unit;
A display processing unit for generating a display signal for displaying the antenna level;
A controller that sequentially switches channels selected by the tuner unit, causes the measurement unit to measure antenna levels for each channel, and causes the display processing unit to generate a display signal that displays a list of the antenna levels for each channel; A broadcast receiving apparatus comprising: The control unit is configured to repeatedly switch the channel to be selected by the tuner unit and measure the antenna level of each channel by the measurement unit. In the list display, the maximum value of the antenna level and the latest measurement for each channel are measured. The broadcast receiving apparatus according to claim 1, wherein a value is displayed. The broadcast receiving apparatus according to claim 1, wherein the control unit is configured to distinguish a channel currently selected by the tuner unit from other channels in a list display of antenna levels of each channel. A display unit for displaying an image of the television broadcast program;
2. The broadcast receiving apparatus according to claim 1, wherein a list of antenna levels for each of the channels is displayed on the display unit based on a display signal generated by the display processing unit. In an antenna level display method of a broadcast receiving apparatus that receives a television broadcast,
A channel selection step of selecting a desired channel from the received broadcast signal;
A measurement step of measuring an antenna level based on a signal of the channel selected in the channel selection step;
Providing a display signal generating step for generating a display signal for displaying the antenna level;
The channel to be selected in the channel selection step is sequentially switched, and the antenna level for each channel is measured in the measurement step. A display signal for displaying a list of the antenna levels for each channel is generated in the display signal generation step. An antenna level display method characterized by the above.

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