JPH04167883A - Receiver - Google Patents

Abstract

PURPOSE:To improve operation convenience by a user by applying on/off control to a power supply supplied to a down-converter in response to the reception state of a channel selection means and a voltage of the power supply superimposed on a signal of an antenna cable. CONSTITUTION:A system control section 11 applies on/off control to a power supply V1 supplied to a down-converter 3 depending whether or not the voltage of the power supply V1 is superimposed on a signal of an antenna cable 2A and whether or not a television signal is able to be demodulated even when no power supply V1 is superimposed through the antenna cable 2A. A satellite broadcast transmitter-receiver 10 is realized, in which it is automatically controlled as to whether or not the power supply V1 is supplied to the down- converter 3 without need of the operation by the user. The user installs the transmitter-receiver 10 easily without knowing the connection form between an antenna 2 and the satellite broadcast transmitter-receiver 10 to view a satellite television broadcast program.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a receiving device, and is particularly applicable to a device that supplies power to a down converter via an antenna cable.

B. Summary of the Invention The present invention provides user convenience by controlling the power supply to the down converter on and off in accordance with the voltage of the power supply superimposed on the antenna cable and the receiving state of the channel selection means in the receiving device. Usability can be improved.

C. PRIOR TECHNOLOGY Conventionally, as a receiving device, for example, a satellite broadcasting receiving device, there is a receiving device in which a power source is superimposed on an antenna cable to supply a predetermined power source to a down converter disposed in the immediate vicinity of the antenna.

In other words, as shown in FIG. 2(A), in such a satellite broadcast receiving device 1, a satellite television broadcast signal in a frequency band of 12 [GHz] received by a parabolic antenna 2 is transmitted to a down converter 3 disposed in the vicinity of the antenna. and frequency 1
(GHz; converted into an I-band intermediate frequency signal S1, and input through the antenna cable 2A.

Intermediate frequency signal S1 input into satellite broadcast receiver l
is input to the BS tuner unit 4 through a diode D1 and a coupling capacitor C1 for preventing backflow of the power supply.

The BS tuner section 4 is configured to select a desired satellite broadcasting channel from the intermediate frequency signal S1, and the resulting television signal S2 is sent to a television receiver (not shown), and in this way, the desired satellite broadcasting channel is selected from the intermediate frequency signal S1. It is now possible to watch satellite television broadcasts.

Here, the down converter 3 placed in the immediate vicinity of the antenna 2 is made smaller and lighter by omitting a power supply device such as a power transformer or a rectifier circuit, and has low noise, for example, +15 (V) and a maximum of 280 (mA). The power must be supplied externally.

Therefore, in the satellite broadcasting receiver M1, a power supply is superimposed on the antenna cable 2A to which the intermediate frequency signal S1 is input, and a power supply of +15 [■] is supplied to the down converter 3.

D Problems to be Solved by the Invention In the satellite broadcast receiving apparatus 1 having such a configuration, whether or not to supply the power supply V1 to the down converter 3 can be selected by a changeover switch 5 attached to the satellite broadcast receiving apparatus 1. is being done.

In practice, when the antenna 2 is connected one-to-one to the satellite broadcast receiving device 1, the user needs to turn on the changeover switch 5 to supply power Vl to the down converter 3.

Further, as shown in FIG. 2(B), the antenna 2 is connected to the distributor 6.
If the power is supplied from both satellite broadcast receivers IA and IB to two satellite broadcast receivers IA and IB through For example, it is necessary to turn on the changeover switch 5A of one satellite broadcast receiver ff IA to supply power V1 to the down converter 3, and turn off the changeover switch 5B of the other satellite broadcast receiver IB.

In addition, when joint reception is performed in a building, etc., a booster (not shown) is usually placed between the down converter 3 and the wall terminals of each room, and this booster supplies power to the down converter 3. Therefore, the user must press the selector switch 5 of the satellite broadcast receiving device 1.
Must be operated off.

However, when the satellite broadcasting receiving device 1 is shipped, the selector switch 5 of the power source 1 is set to the OFF state as an initial state, taking into consideration the various connection forms mentioned above, and the user Selector switch 5 depending on your connection type
There was the complexity of having to set the .

Furthermore, if the user mistakenly sets the changeover switch 5, there is a problem that the down converter 3 will be damaged, making it impossible to view satellite broadcasting, and the user's usability is still insufficient.

The present invention has been made in consideration of the above points, and is intended to provide a receiving device that can improve user-friendliness by controlling on/off the power supply to the down converter without requiring user operations. It is.

8. Means for Solving the Problems In order to solve the problems, the present invention provides a receiving device 10 configured to superimpose and supply a power source 1 to an antenna cable 2A to a down converter 3 disposed adjacent to the antenna 2. , power supply control for controlling on/off the power supply V1 supplied to the down converter 3 according to the voltage 512 (VIO) of the power supply superimposed on the antenna cable 2A and the reception state 514 (Vl'l) of the internal channel selection means 4. Means 11.12.13.14 were provided.

Voltage 512 (VIO) of the power source superimposed on the two antenna cables by the F-acting power source control means 11.12.13.14
and according to the reception state 514 (Vll) of the channel selection means 4,
By controlling the power supply ■1 supplied to the down converter 3 on and off, it is possible to control whether or not the power supply ■1 is supplied to the down converter 3 without requiring any user operation.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, in which parts corresponding to those in FIG. The signal is superimposed on the antenna cable 2A and is supplied to the down converter 3 through a changeover switch 12 that is controlled on and off accordingly.

This system control unit 11 has a microcomputer configuration, and a channel selection signal 311 according to the user's channel operation.
In addition to the function of transmitting a switching signal SIO to the BS tuner section 4, when the power is turned on to the satellite broadcast receiving device 10, the switching signal SIO
is sent to the changeover switch 12 to control whether or not to supply the power supply Vl to the down converter 3.

Here, in this satellite broadcast receiving device 10, the voltage 10 of the power supply superimposed on the antenna cable 2A is input to the inverting input terminal of the first comparator circuit 13 having an operational amplifier configuration, and is input to the non-inverting input terminal. The first comparison result 312 obtained as a result is input to the system control unit 11.

Further, the automatic gain control voltage 11 of the BS tuner section 4 is input to the inverting input terminal of the second comparator circuit 14 having an operational amplifier configuration, and the second reference voltage VR2 is input to the non-inverting input terminal.
The second comparison result S14 obtained as a result is inputted to the system control unit 11.

Furthermore, in this satellite broadcast receiving apparatus 10, a current 11 flowing through the antenna cable 2A is detected by a current detection circuit 15, and this detection result S15 is inputted to the system control section 11.

In the case of this embodiment, the first reference voltage VRI of the first comparator circuit 13 is set to the lower limit voltage for guaranteed operation of the down converter 3, so that the voltage of +15 [V] from the power supply ■1 is applied to the antenna cable 2A. It is determined whether or not the images are superimposed.

Further, the second reference voltage VR2 of the second comparison circuit 14 is set to the threshold voltage of the satellite television signal, and the television signal S2 can be demodulated even if the power supply ■1 is not superimposed on the two antenna cables. In other words, it is possible to determine whether or not the satellite broadcast receiving device is connected to the communal reception facility.

In the above configuration, the system control unit 11 first receives the BS at the timing when the satellite broadcast receiving device 10 is powered on.
All satellite broadcasting channels that are not available in the tuner section 4 (for example, currently channels 11 and 15, B
3.7 and 11 channels for 5-3a, B5-3b
5.9 and 15 channels) is sent out, and the following processing is performed.

That is, the system control unit 11 selects the first and second comparison results for all satellite broadcasting channels, for example, according to the first and second comparison results S12 and S14 input from the first and second comparison circuits 13 and 14. Comparison results of S12 and S
14 both have a logic "H" level, it is determined that power is being supplied to the down converter 3 from another satellite broadcast receiving device, and a switching signal SIO is sent to the changeover switch 12 to turn it off. do.

Furthermore, for all satellite broadcasting channels, when the first comparison result S12 has a logic "L" level and the second comparison result S14 has a logic "H" level, the system control unit 11 performs a process for joint reception. It determines that power is being supplied to the down converter 3 from the booster or the like, and sends a switching signal 310 to the changeover switch 12 to turn it off.

Furthermore, the system control unit 11 calculates the first and second comparison results S12 and S14 for all satellite broadcasting channels.
When both have the logic "L" level, it is determined that power is not being supplied to the down converter 3, and a switching signal SIO is sent to the changeover switch 12 to turn it on, and the power is turned on to the down converter 3. Supply V1.

In addition, the system control unit 11 determines whether there is an abnormal reception or an empty channel when the first comparison result 312 has a logic rHJ level and the second comparison result S14 has a logic rl, J level for all satellite broadcasting channels. It is determined that

In this way, this system control unit 11 receives the first and second comparison results S12 and 314, automatically determines the connection form of the antenna 2 and the satellite broadcast receiving device 10, controls the changeover switch 12 to determine whether or not to supply the power source ■1 to the down converter 3, and thereafter This state is memorized.

In the case of this embodiment, for example, when the power supply v1 is supplied to the down converter 3 and the power supply v1 is supplied from another satellite broadcast receiving device to the down converter 3, this overcurrent is detected by the current detection circuit 15. Detected, detection result 31
5 is input to the system control unit 11.

As a result, the system control unit 11 sends a switching signal SIO to the changeover switch 12 to turn it off, thereby making it possible to prevent an overcurrent to the down converter 3.

According to the above configuration, the system control unit 11 can demodulate the television signal even if the voltage of the power supply 1 is not superimposed on the antenna cable 2A and even if the voltage i[Vl is not superimposed on the antenna cable 2A. Depending on whether
By controlling the power source ■I supplied to the down converter 3 on and off, the satellite broadcast reception can automatically control whether or not to supply the power source ■1 to the down converter 3 without requiring any user operation. The device 10 can be realized.

Therefore, the user can easily install the satellite broadcast receiving device 10 and watch satellite television broadcasting without knowing the connection form between the antenna 2 and the satellite broadcast receiving device 10, and the user's usability is greatly improved. can be improved.

In the above embodiments, the present invention is applied to an independent satellite broadcast receiving device, but the present invention is not limited to this, but can also be applied to a satellite broadcast receiving device built into a television receiver or a video tape recorder. obtain.

Further, in the above-described embodiment, the present invention is applied to a receiving device for satellite television broadcasting, but the present invention is not limited to this. It is widely applicable and suitable for supplying power to down converters placed in the immediate vicinity.

H Effects of the Invention As described above, according to the present invention, the power supply to the down converter is controlled on and off according to the voltage of the power supply superimposed on the antenna cable and the reception state of the channel selection means. It is possible to realize a receiving device that can control the power supplied to the down converter without requiring any user operation, and thus the usability for the user can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a satellite broadcast receiving apparatus according to the present invention, and FIG. 2 is a block diagram illustrating a conventional satellite broadcast receiving apparatus and its connection form. 1.10...Satellite broadcasting receiver, 2...
・Parabola antenna, 3...down converter, 4...BS tuner section, 5.12...
・Selector switch, 11... System control section, 1
3.14... Comparison circuit.

Claims (1)

[Claims] In a receiving device configured to supply power superimposed on an antenna cable to a down converter disposed close to the antenna, the voltage of the power supply superimposed on the antenna cable and an internal channel selection means are provided. A receiving device comprising: power supply control means for controlling on/off the power supply supplied to the down converter according to a reception state of the down converter.