JPH07273529A - Satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To easily and accurately adjust the direction of an antenna installation by connecting a means displaying command data for adjusting a position of an antenna to a cable tying a conversion means and a reception means and locating the display means in the vicinity of the antenna. CONSTITUTION:A TV signal received by an antenna 29 is converted into an intermediate frequency signal at a converter 27 and the converted signal is fed to a tuner 29 via a coaxial cable 28. On the other hand, since a reception state display device 31 displaying a level of a received signal and its scramble system based on data generated by a tuner 29 is connected interposingly to a coaxial cable 28 tying the converter 27 and the tuner 29, the direction of installation of the antenna 26 is easily and accurately adjusted by placing the display device 31 in the vicinity of the antenna 26. When a broadcast channel is discriminated, the direction of the antenna 26 is adjusted while selecting a desired channel by the tuner 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving apparatus for receiving television broadcasts and the like using satellites, and more particularly to an apparatus for facilitating the adjustment work of the installation direction of its antenna.

[0002]

2. Description of the Related Art As is well known, most of the satellite television broadcasts currently performed by using one broadcasting satellite and two communication satellites are scrambled by scrambling television signals for broadcasting. It is a broadcast, and the scramble system is fixed for each satellite. For this reason, in order to receive satellite television broadcasts, a tuner with a built-in decoding processing function for canceling the scramble processing is used, and the orientation of the antenna (for example, parabolic antenna or flat antenna) for receiving broadcast radio waves. Must be installed in exactly the direction of the satellite.

Here, when the direction of the antenna is adjusted to the direction of the satellite, the level of the received signal is adjusted to the position where the received signal level becomes the highest while watching the level indicator installed in the tuner, and at the same time, the reception is adjusted to the desired satellite. This is very important. In this case, to determine whether or not the orientation of the antenna matches the desired satellite, the television signal demodulated and decoded by the tuner is displayed as an image on the television screen for confirmation.

FIG. 5 shows a conventional satellite broadcast receiving apparatus having a decoding processing function for canceling the scramble processing. That is, the television signal from the satellite received by the antenna 11 is supplied to the converter 12 attached to the antenna 11. In this converter 12, the television signal received by the antenna 11 is supplied to the frequency conversion circuit 12a and frequency-converted into a first intermediate frequency signal.

The first intermediate frequency signal output from the frequency conversion circuit 12a is output to the tuner 14 via the coaxial cable 13. In addition, the converter 12
The power supply circuit 12b built in the power supply circuit supplies the power supply power supplied from the tuner 14 side through the coaxial cable 13 to the frequency conversion circuit 12a.

Here, in the tuner 14, the converter 1
The first intermediate frequency signal output from 2 is supplied to the channel selection circuit 14b via the power source critical circuit 14a. The tuning circuit 14b selects a desired channel by frequency-converting the input first intermediate frequency signal into a second intermediate frequency signal based on the tuning data output from the microprocessor 14c. .

The television signal selected by the channel selection circuit 14b is supplied to the demodulation circuit 14d for demodulation processing, and then supplied to the decoding circuit 14e for decoding processing for descrambling. , CRT (Cath
The image is displayed by the ode Ray Tube) 15.

The television signal demodulated by the demodulation circuit 14d is supplied to the signal level detection circuit 14f. The signal level detection circuit 14f detects the level of the demodulated television signal, creates level display data corresponding to the detected level, and outputs it to the microprocessor 14c. Further, the decoding circuit 14e creates scramble system identification data for identifying the scramble system when a television signal subjected to a decipherable scramble process is supplied, and outputs the scramble system identification data to the microprocessor 14c. ing.

Then, the microprocessor 14c receives the level of the television signal being received based on the level display data supplied from the signal level detection circuit 14f and the scramble system identification data supplied from the decoding circuit 14e. And the scramble method are displayed on the display circuit 14g. In addition, the antenna power supply circuit 14h built in the tuner 14 corresponds to the converter 1
The power supply power to be supplied to the power supply 2 is generated. The power source power generated by the antenna power source circuit 14h is given to the converter 12 from the power source weight circuit 14a through the coaxial cable 13.

In such a satellite broadcast receiving apparatus, when the antenna 11 is installed, the direction of the antenna is changed to a desired satellite by observing the received signal level and the scramble system by the display circuit 14g installed in the tuner 14. It is possible to make adjustments so that they match exactly. By the way, in order to adjust the installation direction of the antenna 11 while observing the display content of the display circuit 14g installed in the tuner 14, it is necessary to install the tuner 14 near the antenna 11.

However, as a practical matter, since the installation location of the antenna 11 is outdoors, for example, on a veranda or a roof, the tuner 14 which requires an AC (alternating current) power supply and is not small in size is temporarily used. There is a problem in that it is often very difficult to place the antenna near the antenna 11. For this reason, for example, a person who adjusts the orientation of the antenna 11 and a person who views the display content of the tuner 14 perform an adjustment work while talking to each other, and the work of adjusting the installation direction of the antenna 11 becomes complicated. The inconvenience has occurred.

[0012]

As described above, in the conventional satellite broadcast receiving apparatus, the tuner may be installed in the vicinity of the antenna when adjusting the direction of the antenna so as to accurately match the desired satellite. Since this is often difficult, there is a problem that the work of adjusting the installation direction of the antenna becomes complicated.

Therefore, the present invention has been made in consideration of the above circumstances, and an object thereof is to provide an extremely good satellite broadcast receiving apparatus which enables adjustment work of an antenna installation direction to be performed easily and accurately. And

[0014]

SUMMARY OF THE INVENTION A satellite broadcast receiving apparatus according to the present invention comprises a conversion means for frequency-converting a broadcast signal from a satellite received by an antenna into an intermediate frequency signal, and an intermediate frequency output from this conversion means. A signal is input via a cable, and a channel selection unit that selects a desired signal from the input intermediate frequency signal, and a demodulation unit that performs demodulation processing on the signal selected by the channel selection unit. Data generation means for generating instruction data for antenna position adjustment with respect to the signal selected by the channel selection means, and power supply power supplied to the conversion means for the instruction data generated by the data generation means are important. And a display unit connected to the cable for detecting the instruction data sent to the cable by the receiving unit and displaying the content. In which was to so that.

[0015]

According to the above construction, the display means for displaying the instruction data for adjusting the position of the antenna generated by the receiving means is connected to the cable connecting the converting means and the receiving means. By placing the display means near the antenna, the adjustment work of the installation direction of the antenna can be performed easily and accurately.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the description of an embodiment of the present invention, the basic idea of the present invention will be described below with reference to FIG. That is, in FIG. 4, reference numerals 16 and 17 are antennas, which are installed corresponding to different satellites. These antennas 16 and 17
The television signals received by the
It is supplied to converters 18 and 19 attached to 6 and 17. In these converters 18, 19, the antenna 16,
The television signals received at 17 are supplied to frequency conversion circuits 18a and 19a, respectively, and are frequency-converted into first intermediate frequency signals.

The frequency conversion circuits 18a and 19
The first intermediate frequency signal output from a is supplied to the antenna switching unit 22 via the coaxial cables 20 and 21, respectively. In this antenna switching device 22, the coaxial cable 2
The first intermediate frequency signals supplied via 0 and 21 are respectively supplied to the antenna switching circuit 22a to select one of them. Then, the first intermediate frequency signal selected by the antenna switching circuit 22 a is output to the tuner 24 via the coaxial cable 23. In addition, converter 1
The power supply circuits 18b and 19b built in 8 and 19 are arranged from the tuner 24 side to the coaxial cable 23 and the antenna switch 22.
Also, the power source power supplied via the coaxial cables 20 and 21 is supplied to the frequency conversion circuits 18a and 19a.

Here, in the tuner 24, the first intermediate frequency signal output from the antenna switching device 22 is supplied to the channel selection circuit 24b via the power source critical circuit 24a. The tuning circuit 24b selects a desired channel by frequency-converting the input first intermediate frequency signal into a second intermediate frequency signal based on the tuning data output from the microprocessor 24c.

The television signal selected by the channel selection circuit 24b is supplied to the demodulation circuit 24d for demodulation processing, and then supplied to the decoding circuit 24e for decoding processing for descrambling. , CRT 25 displays an image.

The television signal demodulated by the demodulation circuit 24d is supplied to the signal level detection circuit 24f. The signal level detection circuit 24f detects the level of the demodulated television signal, creates level display data corresponding to the detected level, and outputs it to the microprocessor 24c. Further, the decoding circuit 24e creates scramble system identification data for identifying the scramble system when a television signal subjected to a descrambling scramble process is supplied, and outputs the scramble system identification data to the microprocessor 24c. ing.

Then, the microprocessor 24c receives the level of the television signal being received based on the level display data supplied from the signal level detection circuit 24f and the scramble system identification data supplied from the decoding circuit 24e. And the scramble method are displayed on the display circuit 24g.

Here, the antenna power supply circuit 24h built in the tuner 24 generates power supply power to be supplied to the converters 18 and 19. Further, the microprocessor 24c generates selection data for instructing the antenna switching unit 22 which one of the converters 18, 19 outputs the first intermediate frequency signal. Then, the power supply power generated by the antenna power supply circuit 24h and the selection data output from the microprocessor 24c are supplied to the data weighting circuit 24i and weighted, and then the power weighting circuit 24a and the coaxial cable 23. It is given to the antenna switching unit 22 via.

In this antenna switching device 22, the selection data supplied through the coaxial cable 23 is detected by the data detection circuit 22b and is judged by the switching control circuit 22c, so that the antenna switching circuit 22a is switched to the coaxial cable 2 by the switching control circuit 22c.
One of the first intermediate frequency signals supplied via 0, 21 will be selected. In addition, the power supply circuit 22d built in the antenna switching device 22 has a coaxial cable 23
The power source power supplied through the antenna switching circuit 22
a, the data detection circuit 22b and the switching control circuit 22c.

That is, according to the satellite broadcast receiving apparatus shown in FIG. 4, the selection data generated by the microprocessor 24c of the tuner 24 is duplicated with the power source power generated from the antenna power source circuit 24h by the data weighting circuit 24i. By supplying noise to the antenna switching device 22 via the power source heavy load circuit 24a and the coaxial cable 23, the antenna 24 is provided on the tuner 24 side without providing an extra signal line.
17 received signals can be selected.

Then, as described above, the tuner 24
An embodiment of the present invention, which applies the concept of outputting selection data from the side to the antenna switching device 22 via the coaxial cable 23 and controlling it, will be described in detail with reference to the drawings. In FIG. 1, the television signal received by the antenna 26 is supplied to the converter 27 attached to the antenna 26. In the converter 27, the television signal received by the antenna 26 is supplied to the frequency conversion circuit 27a and frequency-converted into the first intermediate frequency signal.

The first intermediate frequency signal output from the frequency conversion circuit 27a is supplied to the tuner 29 via the coaxial cable 28. In addition, the converter 27
The power supply circuit 27b built in the power supply circuit supplies the power supply power supplied from the tuner 29 side via the coaxial cable 28 to the frequency conversion circuit 27a.

Here, in the tuner 29, the converter 2
The first intermediate frequency signal output from 7 is supplied to the channel selection circuit 29b via the power supply critical circuit 29a. The tuning circuit 29b selects a desired channel by frequency-converting the input first intermediate frequency signal into a second intermediate frequency signal based on the tuning data output from the microprocessor 29c.

The television signal selected by the channel selection circuit 29b is supplied to the demodulation circuit 29d for demodulation processing, and then supplied to the decoding circuit 29e for decoding processing for descrambling. , CRT 30 displays an image.

The television signal demodulated by the demodulation circuit 29d is supplied to the signal level detection circuit 29f. The signal level detection circuit 29f detects the level of the demodulated television signal, creates level display data corresponding to the detected level, and outputs it to the microprocessor 29c. Further, the decoding circuit 29e creates scramble system identification data for identifying the scramble system when a television signal subjected to a scramble process which can be decoded is supplied, and outputs the scramble system identification data to the microprocessor 29c. ing.

Then, the microprocessor 29c receives the level of the received television signal based on the level display data supplied from the signal level detection circuit 29f and the scramble system identification data supplied from the decoding circuit 29e. And the scramble method are displayed on the display circuit 29g.

Here, the antenna power supply circuit 29h built in the tuner 29 generates power supply power to be supplied to the converter 27. Then, the power source power generated by the antenna power source circuit 29h is the data weight circuit 29.
i, is given to the converter 27 via the power supply critical circuit 29a and the coaxial cable 28.

Further, the microprocessor 29c is
Instruction data for instructing the level of the received television signal and its scramble system is generated. The instruction data generated by the microprocessor 29c is supplied to the data weighting circuit 29i and weighted by the power source power generated by the antenna power source circuit 29h, and then transferred to the coaxial cable 28 via the power source weighting circuit 29a. Sent out.

On the line of the coaxial cable 28, a reception status indicator 31 is inserted and connected. In the reception status indicator 31, the instruction data supplied via the coaxial cable 28 is detected by the data detection circuit 31a. The data detection circuit 31a causes the display circuit 31b to display the level of the received television signal and its scramble system based on the detected instruction data. In addition, the power supply circuit 31c built in the reception status indicator 31 supplies the power supply power supplied via the coaxial cable 28 to the data detection circuit 31a and the display circuit 31b.

Therefore, according to the configuration of the above embodiment, the television receiving on the line of the coaxial cable 28 connecting the converter 27 and the tuner 29 based on the instruction data generated by the tuner 29. Since the reception status indicator 31 for displaying the level of the signal and its scramble system is inserted and connected, the reception status indicator 3
By placing 1 in the vicinity of the antenna 26, the antenna 2
The adjustment work of the installation direction of 6 can be performed easily and accurately.

If only one type of scramble system is required, the microprocessor 2 sends the instruction data indicating the level of the television signal being received.
9c makes it possible to control by the presence or absence of scramble system identification data output from the decoding circuit 29e. In this case, when the scramble system is suitable, the microprocessor 29c outputs only the instruction data indicating the television signal level to the reception status indicator 31 for display, so that the configuration of the reception status indicator 31 is changed. It can be simplified.

Further, when the broadcast channel is known, the direction of the antenna 26 may be adjusted while selecting the desired channel with the tuner 29, but the broadcast channel is unknown. In this case, the tuning data corresponding to all channels of the desired satellite may be sequentially output from the microprocessor 29c to the tuning circuit 29b.

Next, FIG. 2 shows a modification of the above embodiment. When the same parts as those in FIG. 1 are denoted by the same reference numerals, the television signals demodulated by the demodulation circuit 29d include a plurality of (two in the illustrated case) decoding circuits 29e.
1, 29e2. These decoding circuits 29e
Reference numerals 1 and 29e2 each have a decoding processing function for canceling scrambling processing of different methods. For this reason, the currently selected television signal has the decoding circuit 29e1 or 2 corresponding to the scramble system.
The decoding process is performed at 9e2. Then, the television signal output from any of the decoding circuits 29e1 or 29e2 is selected by the output switching circuit 29j and supplied to the CRT 30.

In the case of such a configuration, it is necessary to send instruction data indicating the level of the television signal being received and the scramble system from the tuner 29 to the reception status indicator 31, but the direction of the antenna 26. It is possible to prevent the mistake of adjusting to the satellite that does not want. When the broadcast channel is unknown, the tuning data corresponding to all the channels of the desired plurality of satellites can be sequentially output from the microprocessor 29c to the tuning circuit 29b.

Next, FIG. 3 shows another modification of the above embodiment. The same parts as those in FIG. 1 will be described with the same reference numerals. A data detection circuit 27c for detecting the instruction data transmitted from the tuner 29 through the coaxial cable 28 in the converter 27, and the data detection circuit 27c.
A display circuit 27d for displaying the level of the received television signal and its scramble system is provided on the basis of the instruction data detected in.
The power supply circuit 27b also supplies power to the data detection circuit 27c and the display circuit 27d.

With such a configuration, it is not necessary to separately prepare the reception status indicator 31, which is convenient for position adjustment work of the antenna 26 at a high place, for example. Here, the display circuits 31b and 27d can be realized by, for example, a point light emitting diode, a 7-segment light emitting diode, etc., and the data detection circuits 31a and 27c can be realized by a one-chip microcomputer including a light emitting diode drive circuit. it can. In addition, it is appropriate that the instruction data that is critical to the power supply is, for example, about 0.5 V (peak peak). The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

[0041]

As described above in detail, according to the present invention,
It is possible to provide an extremely good satellite broadcast receiving device that enables the adjustment work of the installation direction of the antenna to be performed easily and accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a satellite broadcast receiving apparatus according to the present invention.

FIG. 2 is a block diagram showing a modification of the embodiment.

FIG. 3 is a block diagram showing another modification of the embodiment.

FIG. 4 is a block configuration diagram shown to explain a basic idea of the present invention.

FIG. 5 is a block configuration diagram showing a conventional satellite broadcast receiving device.

[Explanation of symbols]

11 ... Antenna, 12 ... Converter, 13 ... Coaxial cable, 14 ... Tuner, 15 ... CRT, 16, 17 ... Antenna, 18, 19 ... Converter, 20, 21 ... Coaxial cable, 22 ... Antenna switching device, 23 ... Coaxial cable Two
4 ... tuner, 25 ... CRT, 26 ... antenna, 27 ...
Converter, 28 ... Coaxial cable, 29 ... Tuner, 3
0 ... CRT, 31 ... Reception status indicator.

Claims (4)

[Claims] 1. A conversion means for frequency-converting a broadcast signal from a satellite received by an antenna into an intermediate frequency signal, and an intermediate frequency signal output from this conversion means is input via a cable. Channel selection means for selecting a desired signal from the intermediate frequency signal, demodulation means for performing demodulation processing on the signal selected by the channel selection means, and the signal selected by the channel selection means Data generating means for generating instruction data for adjusting the position of the antenna, and transmitting means for transmitting the instruction data generated by the data generating means to the cable by making the power source power supplied to the converting means overlap. And a display unit which is connected to the cable and which detects the instruction data sent to the cable by the receiving unit and displays the content thereof. Satellite broadcast receiver for the butterflies. 2. The satellite broadcast receiving apparatus according to claim 1, wherein the instruction data generated by the data generating means represents the level of the signal selected by the tuning means. 3. The broadcast signal transmitted from the satellite comprises:
The satellite broadcast receiving apparatus according to claim 1, wherein scramble processing is performed, and the receiving means includes decoding means for performing descramble processing on the signal demodulated by the demodulating means. 4. The instruction data generated by the data generating means represents a level of a signal selected by the tuning means and a scrambling method thereof.
The satellite broadcast receiver described.