JP3478486B2 - Received radio wave switching control system, indoor unit, and received radio wave switching control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reception radio wave switching control system for receiving digital satellite broadcasting, an indoor unit and a reception radio wave switching control method, and more particularly to a reception radio wave switching control for appropriately receiving radio waves. The present invention relates to a system, an indoor unit, and a reception radio wave switching control method.

[0002]

2. Description of the Related Art Techniques for receiving services such as digital television broadcasting by radio waves from satellites are known. As a technology for receiving such a digital satellite broadcast, for example, EUTELSAT (European Telecommunications Satellite Organization;
European Telecommunication Satellite Organizatio
DiSEqC (Digital S
atellite Equipment Control).

DiSEqC discloses a technique for switching the operation of an LNB (Low Noise Block Downconverter) according to the type of radio wave to be received, and the following method is shown as a method of switching the operation of the LNB. ing.

That is, by switching the voltage supplied to the outdoor unit having the LNB between 13V and 17V, the polarization of the received radio wave (vertical polarization, horizontal polarization) is switched. Also, depending on whether or not to superimpose a signal of a constant frequency (22 kHz) on the voltage supplied to the outdoor unit, L
The frequency of the NB local signal is switched to select the radio wave to be received.

Further, by bursting the signal of the above-mentioned constant frequency on the supply voltage and supplying it to the outdoor unit, radio waves are transmitted from a plurality of LNBs respectively associated with a plurality of satellites in different orbits. L used for reception
Select the NB and switch the received radio wave. For example,
The outdoor unit sends a 22kHz signal continuously for 12.5ms to select the first LNB, while 0.5m
The second LNB is selected by repeating the operation of sending the 22 kHz signal for s and then not sending this signal for the next 1.0 ms nine times.

In order to switch the operation of the LNB in this way, the outdoor unit has a switching circuit composed of a one-chip microcontroller. This switching circuit needs to be reset every time it is necessary to start the supply of the voltage due to the change of the channel. At this time, the signal for resetting the switching circuit is created by applying the voltage supplied to the switching circuit to a reset circuit such as a differentiating circuit and using the rising edge.

DiSEqC requires that the rising time of the voltage supplied to the reset circuit be 5 ms or less when the switching circuit is reset.

[0008]

SUMMARY OF THE INVENTION In the above conventional technique,
A circuit for supplying a voltage to the outdoor unit to instruct switching of the operation of the LNB is provided in an indoor digital television receiver or the like, and a cable such as a coaxial cable or the like is provided between the outdoor unit and the receiving antenna that is installed integrally. It is necessary to connect with. For this reason, the voltage supplied to the LNB may have a dull rise during propagation through the cable. Moreover, the rise of the voltage supplied to the LNB may be slowed due to the influence of the load of the LNB.

Therefore, it may be impossible to initialize the switching circuit provided in the outdoor unit for switching the operation of the LNB. If the switching circuit cannot be initialized, desired radio waves cannot be properly received.

The present invention has been made in view of the above situation, and an object thereof is to provide a reception radio wave switching control system, an indoor unit and a reception radio wave switching control method for appropriately receiving radio waves from a satellite. To do.

[0011]

In order to achieve the above object, the reception radio wave switching control system according to the first aspect of the present invention selectively outputs one of a plurality of types of voltages to receive from a satellite. Which comprises an indoor unit that specifies a radio wave to be generated and an outdoor unit that selectively receives a radio wave from a satellite according to a voltage received from the indoor unit, wherein the outdoor unit is a radio wave received from a satellite. Signal conversion means for converting the frequency, reception control means for controlling the operation of the signal conversion means to receive a radio wave according to the voltage supplied from the indoor unit, and a rising edge of the voltage supplied from the indoor unit A reset signal generation unit that generates a reset signal from the reset signal generation unit and supplies the reset signal to the reception control unit to initialize the circuit. Creates a reset signal in the reset signal generating means by starting the supply of a voltage by selecting the DC voltage having the largest voltage value among a plurality of types of voltages when starting the supply of the voltage to the outdoor unit. After that, a voltage according to the received radio wave is supplied.

According to the present invention, when the indoor unit starts supplying the voltage to the outdoor unit, it selects the DC voltage having the largest voltage value from the plurality of kinds of voltages and starts supplying the voltage. After causing the reset signal generation means to generate the reset signal, a voltage according to the type of the received radio wave is supplied. As a result, a voltage with a steep rising edge is supplied to the outdoor unit, and the reset signal generation means generates a reset signal from the rising edge of the voltage supplied from the indoor unit and supplies it to the reception control means, thereby reliably initializing the circuit. Can be converted. Therefore, the reception control unit can appropriately control the operation of the signal conversion unit and can appropriately receive the radio wave.

More specifically, the indoor unit includes a DC voltage generating means capable of generating at least two DC voltages having different voltage values, and a selecting means for selecting one from the DC voltages generated by the DC voltage generating means. And a supply switching unit that switches between supplying and stopping the voltage selected by the selecting unit to the outdoor unit, and generating the DC voltage generating unit in the selecting unit when starting the voltage supply to the outdoor unit. It is preferable to provide an operation control unit that selects a DC voltage having the largest voltage value and switches the supply switching unit to start the supply of the voltage to the outdoor unit. Thus, the operation switching unit causes the selection unit to select the DC voltage having the largest voltage value generated by the DC voltage generation unit when starting the supply of the voltage to the outdoor unit, and switches the supply switching unit to the outdoor unit. By starting the supply of the voltage, the voltage with a steep rising edge can be supplied to the outdoor unit. By generating the reset signal from the rising edge of this voltage, the reset signal generation means can surely initialize the reception control means and can properly receive the radio wave.

Further, the indoor unit includes signal output means capable of switching between outputting and stopping an oscillation signal of a predetermined frequency,
Signal reception means for superimposing the output signal of the signal output means on the voltage selected by the selection means, wherein the reception control means is responsive to the oscillation signal superimposed on the voltage supplied from the indoor unit. The operation control means may include means for switching the operation of the signal conversion means, and the operation control means may control the signal output means to stop the output of the oscillation signal and start the supply of the voltage to the outdoor unit.

For example, the signal output means switches between output and stop of an oscillation signal of 22 kHz according to an instruction from the operation control means, and the DC voltage generation means outputs 13V.
And a DC voltage of 17V are preferably generated.

Further, it is preferable that the signal converting means is, for example, a low noise converter for receiving radio waves for digital satellite broadcasting.

The reception radio wave switching control system according to the second aspect of the present invention includes a designation means for selectively outputting one of a plurality of types of voltages to designate a radio wave to be received from a satellite, and the designation. Receiving means for selectively receiving radio waves from the satellite according to the voltage received from the means, wherein the receiving means is a signal converting means for converting the frequency of the radio waves received from the satellite, and the signal Reception control means for controlling the operation of the conversion means to receive a radio wave according to the voltage supplied from the designation means, and the reception control means for generating a reset signal from the rising edge of the voltage supplied from the designation means. And a circuit switching means including a reset signal generating means for initializing the circuit, the designating means, when starting the supply of voltage to the receiving means,
A DC voltage having the largest voltage value is selected from a plurality of types of voltages, and the supply of the voltage is started by causing the reset signal generation means to generate a reset signal, and then a voltage according to the received radio wave is supplied. It is characterized by

According to the present invention, the designation means selects, when starting the supply of the voltage to the receiving means, the DC voltage having the largest voltage value among the plurality of types of voltages and starts the supply of the voltage. After causing the reset signal generation means to generate the reset signal, a voltage according to the type of the received radio wave is supplied. As a result, a voltage with a steep rising edge is supplied to the receiving means, and the reset signal generating means generates a reset signal from the rising edge of the voltage supplied from the indoor unit and supplies it to the reception control means, thereby reliably initializing the circuit. Can be converted. Therefore, the reception control unit can appropriately control the operation of the signal conversion unit and can appropriately receive the radio wave.

The indoor unit according to the third aspect of the present invention selectively supplies and outputs one of at least two voltages having different voltage values to an outdoor unit for receiving radio waves from a satellite. An oscillation signal can be superimposed on the voltage, and when the supply of the voltage to the outdoor unit is started, the reset signal is supplied to the outdoor unit by supplying the voltage with the largest voltage value at which the superposition of the oscillation signal is stopped. For switching the radio waves received by the outdoor unit.

An indoor unit according to a fourth aspect of the present invention supplies a voltage to an outdoor unit for receiving radio waves from a satellite, and generates at least two DC voltages having different voltage values. 1 of the possible DC voltage generating means and the DC voltage generated by the DC voltage generating means
Selection means for selecting one, supply switching means for switching between supply and stop of the voltage selected by the selection means to the outdoor unit, and when starting supply of voltage to the outdoor unit, the selection means A reset signal is generated in the outdoor unit by selecting the DC voltage having the largest voltage value among the voltages generated by the DC voltage generating means and switching the supply switching means to start the supply of the voltage to the outdoor unit. An operation control means is provided.

According to the present invention, when the supply of the voltage to the outdoor unit is started, the operation switching means causes the selecting means to select the DC voltage having the largest voltage value among the voltages generated by the DC voltage generating means, The supply switching means is switched to start the supply of voltage to the outdoor unit. Accordingly, by supplying a voltage having a steep rising edge to the outdoor unit to generate a reset signal, the outdoor unit can be reliably initialized, and radio waves can be properly received.

The operation control is further provided with signal output means capable of switching between outputting and stopping a signal of a predetermined frequency, and signal superimposing means for superimposing the output signal of the signal outputting means on the voltage selected by the selecting means. The means may control the signal output means to stop the output of the signal of the predetermined frequency when starting the supply of the voltage to the outdoor unit.

Further, a received radio wave switching control method according to a fifth aspect of the present invention is a method of switching a radio wave to be received by a voltage supplied to an outdoor unit which receives a radio wave from a satellite. When the power supply to the outdoor unit is started, the high voltage is selectively output from the power supply circuit that can output the low voltage and the high voltage to start the voltage supply to the outdoor unit, and then the voltage is changed according to the received radio wave. , Is characterized.

Further, when the supply of the voltage to the outdoor unit is started, the output of the oscillation signal of a predetermined frequency that can be superimposed on the supply voltage is stopped to start the supply of the voltage to the outdoor unit, and then the radio wave to be received is received. The voltage may be changed according to

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION A reception radio wave switching control system according to an embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a reception radio wave switching control system according to an embodiment of the present invention. As shown in the figure, this reception radio wave switching control system is composed of an outdoor unit 10 and an indoor unit 20 which are mutually connected by a coaxial cable or the like.

The outdoor unit 10 is installed outdoors together with an antenna or the like and is for selecting and receiving radio waves in accordance with an instruction received from the indoor unit 20, and has a switching circuit 1 and a first LNB (Low Noise Block). Downconverte
r) 2 and the second LNB 3.

The switching circuit 1 connects the LNB receiving the voltage from the indoor unit 20 and receiving the radio wave to the first LNB 2 and the second LNB.
The LNB 3 is used to select a radio wave to be received, and includes a microcontroller 11 and a reset circuit 12.

The microcontroller 11 has a LNB2
3 for controlling the operation of the indoor unit 2
Depending on the voltage received from 0, the first LNB2 or the second LNB2
Either one of the NB3 is activated and the radio wave to be received is selected.

Further, the microcontroller 11 needs to initialize the circuit each time the supply of the voltage from the indoor unit 20 is started.

The reset circuit 12 is for generating a reset signal for initializing the circuit of the microcontroller 11 when the supply of the voltage from the indoor unit 20 is started. FIG. 2 is a configuration diagram showing an example of the configuration of the reset circuit 12. As shown, the reset circuit 1
The reference numeral 2 includes a regulator 13 that receives a voltage from the indoor unit 20 and regulates it to a predetermined voltage (for example, 5 V), and a differentiating circuit 14 that includes a capacitor C and a resistor R.

The reset circuit 12 having such a configuration
Supplies the voltage at the connection point between the capacitor C and the resistor R in the differentiating circuit 14 to the microcontroller 11 when the supply of the voltage from the indoor unit 20 is started. As a result, the reset circuit 12 differentiates the rising edge of the voltage to generate an impulse-shaped reset signal and supplies it to the microcontroller 11 to initialize the circuit.
Further, the voltage output from the regulator 13 becomes a power supply voltage for driving the microcontroller 11.

The LNBs 2 and 3 are low noise converters for receiving and amplifying a radio wave corresponding to the voltage supplied from the switching circuit 1 and converting the frequency, for example, for receiving a radio wave for digital satellite broadcasting. Is a low noise converter.

The indoor unit 20 is installed in a digital television receiver or the like, and is for selecting an electric wave to be received. The indoor unit 20 and the PWM (Pulse Width Modula) are provided.
section) signal generation circuit 5, switches 6 and 7, a combination circuit 8 and a control circuit 9.

The power supply circuit 4 regulates a power supply voltage taken from the outside to a predetermined voltage and supplies it to the outdoor unit 10, and generates and outputs at least two DC voltages having different voltage values. For example, the power supply circuit 4 is
Switch 6 by outputting two kinds of DC voltage of 3V and 17V
Send to. The two types of voltage output by the power supply circuit 4 are LNB.
It is used to switch the polarization (vertical polarization, horizontal polarization) of the radio waves received by the radio waves 2 and 3.

The PWM signal generating circuit 5 is a circuit for generating an oscillating signal of a constant frequency, and switches the output of the oscillating signal and the stop of the output according to an instruction from the control circuit 9 to generate a burst-like oscillating signal. Outputs (simple tone burst signal) or continuous oscillation signal. More specifically, the PWM signal generation circuit 5 generates an oscillation signal having a wave height of 650 mV and a frequency of 22 kHz, and outputs the oscillation signal according to an instruction from the control circuit 9.
Stops the output of oscillation signals.

The switch 6 is composed of a semiconductor switch or the like, and is for selecting and outputting one of the DC voltages output by the power supply circuit 4.

The switch 7 is composed of a semiconductor switch or the like, and is for switching the supply and the stop of the voltage to the outdoor unit 10. The output end is connected to the outdoor unit via a cable and the two input ends are connected. Is connected to the synthesis circuit 8 and the common potential terminal.

The synthesizing circuit 8 is composed of an operational amplifier and the like, and has a voltage received from the power supply circuit 4 via the switch 6,
It is for superimposing the oscillation signal received from the PWM signal generation circuit 5.

The control circuit 9 is composed of a microprocessor or the like and controls the operation of the entire reception radio wave switching control system. More specifically, the control circuit 9 switches the switch 6 and the switch 7 to switch the voltage to be supplied to the outdoor unit 10, and at the same time, the PW
The M signal generation circuit 5 is controlled to output an oscillation signal or stop the output.

Next, the operation of the reception radio wave switching control system according to the embodiment of the present invention will be described. This reception radio wave switching control system causes the reset circuit 12 to generate a reset signal by supplying a voltage to the outdoor unit 10 by defining the voltage so that the rising edge becomes steep, and thus the microcontroller 11 is surely initialized. It is a system that can be converted to receive appropriate radio waves.

In the following, this reception radio wave switching control system is referred to as EUTELSAT (European Telecommunications Satellite Organization; Eu).
ropean Telecommunication Satellite Organization)
DiSEqC (Digital Satell standardized by
It will be described as being compatible with (ite Equipment Control). That is, the power supply circuit 4 has a low voltage of 13V.
Is generated, and a high voltage of 17V is generated. The frequency of the oscillation signal generated by the PWM signal generation circuit 5 is 22 kHz. This reception radio wave switching control system is shown in the flowchart of FIG. 3 when the user instructs the digital television receiver to change the reception channel or the like and starts the voltage supply to the outdoor unit 10 from the state where the voltage is not supplied. The switching control process shown is executed.

When the switching control process is started, the control circuit 9
Controls the PWM signal generation circuit 5 to stop the output of the oscillation signal (step S1). That is, the control circuit 9
Stops the PWM signal generation circuit 5 when it outputs the oscillation signal, and holds the state when it does not output the oscillation signal.

Next, the control circuit 9 switches the switch 6 and the high voltage (17V) supplied from the power supply circuit 4 is used as the voltage for the reset circuit 12 to generate the reset signal.
Is selected and provided to the switch 7 (step S
2). At this time, the output end of the switch 7 is connected to the common potential terminal, and the supply of the voltage to the outdoor unit 10 is not started.

The control circuit 9 switches the switch 7,
The high voltage (17V) output from the switch 6 is supplied to the outdoor unit 10 (step S3). In this way, the indoor unit 20 starts the supply of the voltage to the outdoor unit 10, and the switching circuit 1 that receives the voltage from the indoor unit 20 differentiates the rising edge of the voltage by the reset circuit 12 and resets the reset signal. Is generated and supplied to the microcontroller 11,
To initialize.

As described above, when the supply of the voltage to the outdoor unit 10 is started, the high voltage (17
By selecting V) and then supplying a voltage to the outdoor unit 10, a voltage with a steep rising edge can be supplied, and the reset circuit 12 can easily generate a reset signal. As a result, the reset signal can be reliably applied to the microcontroller 11 included in the switching circuit 1 for initialization, the operations of the LNBs 2 and 3 can be appropriately switched, and the radio waves can be properly received.

After that, the control circuit 9 switches the connection destination of the switch 6 between the low voltage and the high voltage output from the power supply circuit 4 depending on whether the received radio wave is the horizontal polarization or the vertical polarization ( Step S4). For example, when the received radio wave is vertically polarized, the control circuit 9 controls the switch 6 to output the low voltage (13 V) of the power supply circuit 4, and the outdoor unit 10 via the synthesis circuit 8 and the switch 7. Supply low voltage.
On the other hand, if the received radio wave is horizontally polarized, the control circuit 9
Controls the switch 6 to control the high voltage (17
V) is output and a high voltage is supplied to the outdoor unit 10 via the combination circuit 8 and the switch 7.

Further, the control circuit 9 controls the PWM signal generating circuit 5 to instruct the outdoor unit 10 to receive a radio wave by either one of the first LNB 2 and the second LNB 3 to oscillate in a burst form. Signal (simple tone
A burst signal) is generated (step S5). At this time, the control circuit 9 causes the outdoor unit 10 to send the first LNB 2
When instructing to receive the radio wave by, the PWM signal generation circuit 5 is made to generate a continuous 22 kHz signal for 12.5 ms, and the synthesis circuit 8 superimposes it on the voltage supplied by the power supply circuit 4. On the other hand, the control circuit 9 causes the outdoor unit 10 to receive the second
When instructing the reception of the radio wave by the LNB3, the operation of causing the PWM signal generation circuit 5 to output a signal of 22 kHz for 0.5 ms and not outputting the signal for the next 1.0 ms is repeated 9 times to synthesize the signal. In the circuit 8, it is superimposed on the voltage supplied by the power supply circuit 4.

Next, the control circuit 9 controls the PWM signal generation circuit 5 to switch the continuous oscillation signal output,
The frequencies of the local signals B2 and B3 are selected (step S6). At this time, when the control circuit 9 receives a radio wave in a high frequency band of the band secured for digital satellite broadcasting, the control circuit 9 causes the PWM signal generation circuit 5 to have a constant frequency (22 kHz).
The oscillation signal of is continuously output. On the other hand, when receiving the signal in the low frequency band, the control circuit 9 causes the PWM signal generation circuit 5 to stop the output of the oscillation signal. The synthesis circuit 8 superimposes the output voltage of the PWM signal generation circuit 5 on the voltage received from the switch 6 and supplies the output voltage to the outdoor unit 10 via the switch 7.

After that, tuning such as setting a local oscillation signal frequency of a receiving circuit (not shown) installed in the digital television receiver can be performed to receive a service of a desired channel.

Next, as a specific example, a voltage of 13 V is supplied to the outdoor unit 10 to send a continuous oscillation signal of 12.5 ms to select the first LNB 2 for reception and receive a high frequency band signal. The operation when doing is explained. In this case, the indoor unit 20 supplies the voltage as shown in the timing chart of FIG. Here, the timing T shown in FIG.
In 1 to T5, the control circuit 9 controls each part of the indoor unit 20 to change the voltage supplied to the outdoor unit 10.

First, before the timing T1, the control circuit 9 receives an instruction from the receiving circuit of the digital television receiver to start the supply of the voltage to the outdoor unit 10,
Until timing T1, the output of the PWM signal generation circuit 5 is stopped (step S1 in FIG. 3), and the switch 6
The high voltage (17V) output from the power supply circuit 4 is output (step S2 in FIG. 3).

Next, at timing T1, the control circuit 9
Controls the switch 7 to supply a voltage to the outdoor unit 10 (step S3 in FIG. 3). At this time, the voltage output by the indoor unit 20 is a high voltage (17V), and since the oscillation signal is not superimposed, the rising edge becomes steep. Therefore, the reset circuit 12 included in the switching circuit 1 of the outdoor unit 10 can generate an appropriate reset signal and supply it to the microcontroller 11 to initialize the circuit.

After that, the control circuit 9 switches the switch 6 at timing T2 to output a voltage of 13 V which is a voltage corresponding to the received radio wave.

Next, the control circuit 9 controls the PWM signal generation circuit 5 at timing T3 to supply a signal having a wave height of 650 mV and a frequency of 22 kHz for 12.5 ms (up to timing T4). The voltage is superimposed on the voltage, and the outdoor unit 10 is instructed to receive by the first LNB 2.

After that, the control circuit 9 stops the output of the constant frequency signal from the PWM signal generating circuit 5 at the timing T4, and then outputs this signal again at the timing T5. It should be noted that it is possible to allow at least 15 ms to elapse between the timing T4 and the timing T5 by using DiSEqC (Di
gital Satellite Equipment Control).

As described above, according to the present invention,
When the supply of the voltage to the outdoor unit 10 is started, the oscillation signal is supplied to the outdoor unit 10 without being superimposed on the high voltage supplied by the power supply circuit 4. As a result, the reset circuit 12 reliably generates the reset signal and resets the microcontroller 11, so that the radio wave can be properly received.

The present invention is not limited to the above embodiment, and various modifications and applications are possible. For example, although the above embodiment has been described as selecting one that receives a signal from two LNBs 2 and 3, the present invention is not limited to this, and a system that selects one that receives a radio wave from any number of LNBs can be used. Is also applicable.

In the above embodiment, the microcontroller 11 selects the radio wave to be received by operating either the first LNB2 or the second LNB3. Not limited.
That is, the first LNB2 and the second LNB3 can receive various radio waves, and the microcontroller 11
The radio waves to be received may be selected by controlling the operations of 2 and 3.

More specifically, the microcontroller 1
1 receives the voltage of 13V from the indoor unit 20 and
LNB so that NB2 and 3 receive vertically polarized radio waves
A few operations may be controlled. On the other hand, the microcontroller 11 may control the operation of the LNBs 2 and 3 so that the LNBs 2 and 3 receive the horizontally polarized radio waves when receiving the voltage of 17V from the indoor unit 20.

Further, the microcontroller 11 uses the burst-like oscillation signal (simple tone burst signal) superimposed on the voltage received from the indoor unit 20,
The voltage supply destination may be switched between the first LNB 2 and the second LNB 2 to select the LNB that receives the radio wave. In this case, for example, when the oscillation signal of 22 kHz is continuously superimposed on the voltage received from the indoor unit 20 for 12.5 ms, the microcontroller 11 causes the first
Let LNB2 receive the radio wave. On the other hand, the microcontroller 11 outputs the voltage received from the indoor unit 20 to 0.
22mhz oscillation signal with 5ms signal width is 1.0m
If 9 bursts are superimposed at s intervals, the second L
Let NB3 receive radio waves.

Further, the microcontroller 11 may select the band of the radio wave received by the LNBs 2 and 3 by the continuous oscillation signal superimposed on the voltage received from the indoor unit 20. In this case, for example, if the oscillation signal of 22 kHz is not superimposed on the voltage received from the indoor unit 20, the microcontroller 11 controls the frequency of the local signals of the LNBs 2 and 3 to receive the low frequency band of the radio waves. To receive the radio wave of. On the other hand, the microcontroller 11 receives a voltage of 22k from the indoor unit 20.
When the oscillation signal of Hz is continuously superimposed, LNB
The frequencies of the local signals of 2 and 3 are controlled to receive the radio waves in the high frequency band among the receivable radio waves.

As described above, even when the microcontroller 11 controls the operations of the LNBs 2 and 3 to select the radio wave to be received, the indoor unit 20 should superimpose the oscillation signal on the high voltage output from the power supply circuit 4. By starting the supply without the need, it is possible to reliably reset the microcontroller 11 and receive appropriate radio waves.

Further, in the above embodiment, the power supply circuit 4
Has been described as generating two types of DC voltage of 13V and 17V, but the present invention is not limited to this, and any power supply circuit that generates a plurality of voltages having different voltage values may be used. In this case, when starting the supply of the voltage to the outdoor unit 10,
By selecting the voltage having the highest voltage value generated by the power supply circuit and starting the supply, a voltage with a steep rising edge can be supplied, and the switching circuit 1 can be reliably initialized.

In the above embodiment, the received radio wave switching control system has been described as being compatible with DiSEqC, but the invention is not limited to this, and an arbitrary radio wave that controls the operation of the LNB to select a radio wave to be received. It is applicable to the system. Also, the received radio waves are not limited to those from satellites,
It may be ground wave or the like.

Further, the outdoor unit 10 does not necessarily have to be installed outdoors, and the indoor unit 20 does not necessarily have to be installed indoors. That is, if the radio waves from the satellite can be selected and received, the outdoor unit 10 and the indoor unit 20 can
It may be installed indoors.

[0067]

As described above, according to the present invention, when the supply of the voltage to the outdoor unit is started, the voltage capable of reliably generating the reset signal is supplied to properly receive the radio wave. Receiving radio wave switching control system,
An indoor unit and a reception radio wave switching control method can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a reception antenna switching control system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an example of a configuration of a reset circuit.

FIG. 3 is a flowchart for explaining the operation of the receiving antenna switching control system according to the embodiment of the present invention.

FIG. 4 is a timing chart for explaining an output voltage of an indoor unit.

[Explanation of symbols]

1 switching circuit 2,3 LNB 4 power supply circuit 5 PWM signal generation circuit 6,7 switch 8 Compositing circuit 9 Control circuit 10 outdoor units 11 Micro controller 12 Reset circuit 13 Regulator 14 Differentiation circuit 20 indoor units C capacitor R resistance

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B 1/18 H04N 5/44 H04N 7/20 630

Claims (11)

(57) [Claims] 1. An indoor unit for selectively outputting one of a plurality of types of voltages and designating a radio wave to be received from a satellite,
A reception radio wave switching control system including an outdoor unit that selectively receives radio waves from a satellite according to a voltage received from the indoor unit, wherein the outdoor unit is a signal that converts the frequency of radio waves received from the satellite. Conversion means, reception control means for controlling the operation of the signal conversion means to receive a radio wave according to the voltage supplied from the indoor unit, and generating a reset signal from the rising edge of the voltage supplied from the indoor unit And a circuit switching means including a reset signal generating means for initializing a circuit to supply to the reception control means, the indoor unit, when starting the supply of voltage to the outdoor unit, a plurality of types By selecting the DC voltage having the largest voltage value from the voltages and starting the supply of the voltage, the reset signal generating means is reset. A reception radio wave switching control system, which generates a signal and then supplies a voltage according to a received radio wave. 2. The indoor unit, a direct current voltage generating means capable of generating at least two direct current voltages having different voltage values, a selecting means for selecting one from the direct current voltages generated by the direct current voltage generating means, Supply switching means for switching between supplying and stopping the voltage selected by the selecting means to the outdoor unit, and the most voltage generated by the DC voltage generating means in the selecting means when starting the supply of the voltage to the outdoor unit. The reception radio wave switching control system according to claim 1, further comprising: an operation control unit that selects a DC voltage having a large value and switches the supply switching unit to start the supply of the voltage to the outdoor unit. . 3. The indoor unit, which is capable of switching between outputting and stopping an oscillation signal of a predetermined frequency, and signal superimposing means for superimposing the output signal of the signal outputting means on the voltage selected by the selecting means. Further comprising, the reception control means comprises means for switching the operation of the signal conversion means in accordance with an oscillation signal superimposed on the voltage supplied from the indoor unit, the operation control means, the signal output means 3. The reception radio wave switching control system according to claim 2, wherein the output of the oscillation signal is stopped to start the supply of the voltage to the outdoor unit. 4. The signal output means switches between output and stop of an oscillation signal of 22 kHz in accordance with an instruction from the operation control means, and the DC voltage generation means has a DC voltage of 13V and a 17V voltage.
The reception radio wave switching control system according to claim 3, wherein the DC voltage is generated. 5. The reception radio wave switching according to claim 1, wherein the signal conversion means is a low noise converter for receiving radio waves for digital satellite broadcasting. Control system. 6. A designating unit for designating a radio wave to be received from a satellite by selectively outputting one of a plurality of kinds of voltages, and a radio wave from the satellite selectively according to the voltage received from the designating unit. A reception radio wave switching control system comprising a reception means for receiving, wherein the reception means controls the operation of the signal conversion means for converting the frequency of the radio wave received from the satellite, and controls the operation of the signal conversion means from the designation means. Reception control means for receiving a radio wave according to the supplied voltage and reset signal generation for generating a reset signal from the rising edge of the voltage supplied from the designating means and supplying the reset signal to the reception control means to initialize the circuit. And a circuit switching unit having a unit, the designating unit selects a DC voltage having the largest voltage value among a plurality of types of voltages when starting the supply of the voltage to the receiving unit. The received radio wave switching control system is characterized in that the reset signal generation means is caused to generate a reset signal by starting the supply of a voltage, and then a voltage corresponding to a radio wave to be received is supplied. 7. An indoor unit capable of selectively supplying one of at least two voltages having different voltage values to an outdoor unit for receiving radio waves from a satellite and superimposing an oscillation signal on an output voltage. When the supply of the voltage to the outdoor unit is started, the reset signal is generated in the outdoor unit by supplying the voltage having the largest voltage value in which the superposition of the oscillation signal is stopped, An indoor unit for switching received radio waves. 8. An indoor unit for supplying a voltage to an outdoor unit for receiving a radio wave from a satellite, and a DC voltage generating means capable of generating at least two DC voltages having different voltage values, said DC voltage generating means. Selecting means for selecting one of the DC voltages generated by the means, supply switching means for switching between supplying and stopping the voltage selected by the selecting means to the outdoor unit, and supplying voltage to the outdoor unit. At the time of starting, by causing the selecting means to select the DC voltage having the largest voltage value among the voltages generated by the DC voltage generating means, and switching the supply switching means to start the supply of the voltage to the outdoor unit. An indoor unit, comprising: an operation control unit that causes the outdoor unit to generate a reset signal. 9. A signal output means capable of switching between outputting and stopping a signal of a predetermined frequency, and signal superimposing means for superimposing an output signal of the signal outputting means on a voltage selected by the selecting means, 9. The indoor unit according to claim 8, wherein the operation control means controls the signal output means to stop the output of a signal of a predetermined frequency when starting the supply of the voltage to the outdoor unit. . 10. A received radio wave switching control method for switching a radio wave to be received by a voltage supplied to an outdoor unit which receives a radio wave from a satellite, wherein a low voltage and a high voltage are applied when starting to supply a voltage to the outdoor unit. A method of controlling reception radio wave switching, characterized in that a high voltage is selectively output from a power circuit capable of outputting to start supply of voltage to an outdoor unit, and then the voltage is changed according to a radio wave to be received. 11. An electric wave to be received after starting the supply of a voltage to an outdoor unit and stopping the output of an oscillation signal of a predetermined frequency that can be superimposed on the supply voltage to start the supply of a voltage to the outdoor unit. The received radio wave switching control method according to claim 10, wherein the voltage is changed according to the following.