JP4420044B2 - Digital receiver - Google Patents

Description

  The present invention relates to a receiving apparatus (international patent classification H04N17 / 00) used for digital broadcasting.

  In general, in the case of satellite broadcasting, for example, digital broadcasting is composed of signals having a plurality of different frequency bands for each repeater (transponder) of a stationary satellite. Further, in the conventional satellite digital broadcast receiving apparatus, the signal quality such as the CN ratio at a specific reception signal frequency that is initially set or selected by the user is displayed as a predetermined level value for the adjustment of the installation of the reception antenna. Function is provided.

  A reception signal level display method for the conventional digital broadcast receiving apparatus that performs the above functions will be described below.

  FIG. 7 shows a circuit block diagram of a general digital broadcast receiving apparatus. FIG. 8 shows a flowchart of conventional signal level display. As shown in FIG. 8, the signal levels are displayed in the following order. The signal from the receiving antenna 71 is selected by the tuner unit 72, the CN ratio of the signal is detected by the demodulation unit 73, and then sent to the calculation unit 74 as data. The calculation unit converts the data into a signal level based on a predetermined conversion, and causes the display device 75 to output and display the data. The signal level is detected again at a preset time interval, and the value is updated. The received signal level is displayed on a screen (reception setting screen) where the received signal frequency can be set by operating a button provided on the receiving device or operating an attached remote controller. FIG. 9 is an example of a reception setting screen, 91 is a broadcast service to be received, 92 is a transponder number, 93 is a received signal frequency (transponder center frequency), and 95 is a signal level. On this screen, the reception signal frequency is selected, and the signal level at the specified frequency is acquired and displayed.

  However, in the above-described conventional example, the role of the function is mainly for the purpose of adjusting the installation of the receiving antenna, so that the purpose can be achieved by displaying only the level corresponding to any received signal frequency. However, for example, a satellite reception antenna and a transmission system that simultaneously receives a CS (110 degrees CS) that performs a new broadcasting service using a frequency band different from the BS in the same geostationary orbit (110 degrees east longitude) as the BS. In a system, if it is unknown whether the existing system supports it, it becomes necessary to examine the difference between signal frequencies. At that time, in the conventional digital broadcast receiving apparatus, it is necessary to display the level for each signal frequency by performing operations such as reception signal frequency or channel switching many times, which is very difficult in terms of time and labor. Come on.

Digital broadcast receiving apparatus of the present invention to achieve this object, a tuner section for selecting a received signal, a demodulator for detecting a reception CN ratio by demodulating the tuned signal by the tuner unit, a tuner unit and it controls the demodulating unit performs the detection of the channel selection and reception CN ratio of a plurality of received signal frequency, an arithmetic unit for displaying the reception CN ratio of a plurality of received signal frequency is detected on one screen, operation The unit can be selected automatically or manually. When automatic is selected, multiple reception signal frequencies are selected at predetermined time intervals. When manual is selected, the reception frequency specified by the user on the screen is selected. It is characterized by selecting.

  With this configuration, by displaying multiple received signals within the received frequency band on the same screen, the time and effort required to switch channels can be reduced, and used as a guide for easily determining the suitability of the receiving system. Can do.

  According to the present invention, a signal level display function mainly used for installation of a reception antenna is mounted with a function of displaying a plurality of signal levels from display for a single frequency signal. The characteristics of the transmission system to be connected can be confirmed, and further, it has the effect that the user can immediately recognize it by displaying it in a graphic form on the same screen. This makes it easy to determine whether a transmission system consisting of existing coaxial cables, distributors, boosters, etc. in homes and buildings is compatible with the desired broadcast service, without using special instruments. An excellent effect that it can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a flowchart of signal level display of the digital broadcast receiving apparatus according to Embodiment 1 of the present invention. The following description will be made along the flowchart.

  When one specific channel is in the receiving state, the signal is selected by the tuner unit 72 in the digital broadcast receiving apparatus shown in FIG. 7, and the demodulation unit 73 detects the demodulation and the received CN ratio. Controlled. Thereafter, the output data of the demodulator is acquired by the calculator 74 and converted into a signal level based on a predetermined conversion formula. As for the reception state at this time, the state of one reception channel can be confirmed on the reception setting screen as shown in FIG.

  In this setting screen, for example, a button (cell) such as a reception status selection cell 94 is provided and when it is selected, the screen is switched to the reception status screen as shown in FIG. 2, and the reception signal frequency is automatically determined according to a certain order. And switching the frequency scan for all receivable channels. As a result, the signal level 21 for each reception channel is graphed or displayed with a numerical value as needed by the calculation process. This calculation processing is performed until the reception status screen is closed. After the screen is closed, the processing returns to the original reception setting screen 90, selects a predetermined signal frequency again, and displays the signal level.

  Here, the value of the signal level is updated only for one channel at any given time in a certain time after the tuner unit synchronization is established on the reception setting screen, whereas the level value on the reception status screen is a value obtained once. The calculation unit is pre-programmed so as to be updated at any time after holding and scanning all channels at a constant period.

  As described above, since the signal levels for a plurality of channels can be displayed on the same screen, the frequency characteristics of a transmission system composed of various transmission devices can be confirmed. As a result, it is possible to determine whether an existing transmission system is an appropriate system for receiving a broadcast service without using a special measuring instrument.

(Embodiment 2)
In the second embodiment of the present invention, in addition to the function of the first embodiment, a function for a user to specify a specific channel among signal levels for a plurality of channels is added. Specifically, this is a function that can update the level values at any time for a channel designated by the user at a predetermined time while maintaining the signal levels of the plurality of channels already acquired. FIG. 3 shows a flowchart when this function is added, and will be described using the reception status screen shown in FIG.

  When the “auto / manual” switching cell 22 is selected and the mode is switched to the manual mode, a channel marker 23 surrounding the channel number appears, and the user can specify the channel by moving the cursor to a specific channel. Further, when the “auto / manual” switching cell is selected again, it is possible to automatically switch to the original channel and switch to the automatic display mode for acquiring and updating the level value. Thereby, even if it does not return to a reception setting screen, it can fix to one channel and can confirm a signal level, Therefore There exists an effect that it can use for the installation adjustment of a receiving antenna or confirmation at the time of a radio wave disturbance, etc.

(Embodiment 3)
The third embodiment of the present invention has a function of displaying the signal level separately for each broadcast service (network) on the same screen. For example, when the reception status selection cell 94 on the reception setting screen in FIG. 9 is selected, the network selection screen shown in FIG. 4 is displayed, and when the network selection cell 41 to be displayed is selected, the network in the selected network as shown in FIG. The signal level is displayed.

  Alternatively, as another means, when the reception status selection cell 94 on the reception setting screen of FIG. 9 is selected, all signal levels for a plurality of networks are displayed. FIG. 6 shows an example of the reception status screen in that case. When a network in this screen is selected with the cursor, the reception status screen for displaying the signal level for one network is displayed as shown in FIG. .

  As a result, when there is a receiving system environment in which a plurality of networks can be received, a plurality of signal levels can be confirmed at a time and a network can be selected, thereby further facilitating the confirmation of the level value. There is.

  As described above, the functions in the embodiment of the present invention are realized through a calculation unit by writing a predetermined program in a memory built in the digital broadcast receiving apparatus. In addition, screen display or selection can be performed by a hardware key of the receiving device or an accompanying remote controller.

  The digital receiver according to the present invention does not use a special measuring instrument to determine whether or not a transmission system composed of existing coaxial cables, distributors, boosters, etc. in homes and buildings is compatible with a desired broadcast service. In addition, it is useful in a receiving apparatus used for digital broadcasting that can be easily determined.

Flowchart of signal level display in Embodiment 1 of the present invention The figure which shows the reception condition screen in Embodiment 1 of this invention Flowchart of signal level display in Embodiment 2 of the present invention The figure which shows the network selection screen in Embodiment 3 of this invention The figure which shows the reception condition screen in Embodiment 3 of this invention The figure which shows the other reception condition screen in Embodiment 3 of this invention Block diagram of digital broadcast receiver Flow chart of signal level display in conventional example The figure which shows the reception setting screen of the signal level in the conventional example

Explanation of symbols

21 Signal level 22 Manual / automatic switching cell 23 Channel marker 41 Network selection cell 71 Receiving antenna 72 Tuner unit 73 Demodulation unit 74 Calculation unit 75 Display device 76 Memory 90 Reception setting screen 91 Broadcast service (network)
92 reception channel 93 signal frequency 94 reception status selection cell 95 signal level

Claims (1)

A tuner section for selecting a received signal, a demodulator for detecting a reception CN ratio by demodulating the tuned signal by the tuner unit, the tuner unit and controls the demodulation of the plurality reception signal frequency A calculation unit that performs channel selection and reception CN ratio detection, and displays the detected reception CN ratios of the plurality of reception signal frequencies on one screen ,
The calculation unit can be automatically or manually selected. When automatic is selected, a plurality of reception signal frequencies are selected at predetermined time intervals. When manual is selected, the user designates on the screen. A digital broadcast receiver characterized by selecting a received frequency .

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