JPH0129097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input device for a multidirectional reception booster (hereinafter referred to as a booster).

If new television broadcasting is started from the current television broadcasting and multidirectional reception is required, antenna construction will be required because a new antenna must be added to the existing antenna. On the other hand, with conventional boosters that have a single input configuration, the reception system is limited, and in some cases, there are problems such as large-scale changes (construction) to the existing reception system. be.

The present invention solves the above problems and provides a booster that can be configured into any receiving system. An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a booster, which is input from the first, second, and third input terminals 2, 3, and 4, and these input terminals 2, 3, and 4. One common output terminal 10 is provided for television signals. The television signal input to the first input terminal 2 passes through a high-pass filter 5, an amplifier 6, and a high-pass filter 5', and the television signal input to the third input terminal 4 passes through a switch circuit 14 and a band-pass filter 8. As described above, the respective UHF band television signals are mixed, passed through a high-pass filter 9, and outputted to an output terminal 10. Furthermore, the television signal input to the second input terminal 3 is passed through a switch circuit 12 and a low-pass filter 7.
and is output to the output terminal 10. This route is
It allows VHF band television signals to pass through. The first switch circuit 12 connects the low pass filter 11 (first input terminal 2) and the second switch circuit to the low pass filter 7 and the high pass filter 13.
It is used to switch and connect input terminal 3 of the
22 switch circuits 14 switch and connect the high-pass filter 13 (input terminals 2 and 3) and the third input terminal 4 to the band-pass filter 8.

FIG. 2 shows the frequency characteristics of the booster shown in FIG. 1. In the figure, a solid line 20 shows the characteristic when the signal passes through the low-pass filter 7, a solid line 21 shows the characteristic when the signal passes through the band-pass filter 8, and a solid line 22 shows the characteristic when the signal passes through the high-pass filters 5, 5' and the amplifier circuit 6.

Examples of different receiving systems are shown in FIGS. 3, 4, 5, and 6. Figure 3 shows an example of a receiving system in the case of a 3-input method.
The output of the antenna 23 is connected to the first input terminal 2 of the booster 1, the output of the VHF antenna 24 is connected to the second input terminal 3, and the output of the UHF antenna 25 is connected to the third input terminal 4. At this time, the switch circuits 12 and 14 of the booster 1 both short-circuit the contacts a and b.

Therefore, the UHF band television signal and VHF band television signal input to the first and third input terminals 2 and 4 and the second input terminal 3 are transmitted to the first and third input terminals as described above. The television signals entering terminals 2 and 4 are respectively passed through high-pass filters 5-
The signal is mixed through the amplifier circuit 6 - high pass filter 5' and the switch circuit 14 - band pass filter 8, passes through the high pass filter 9 and appears at the output terminal 10. Further, a VHF band television signal is sent to an output terminal 10 through a switch circuit 12 and a low-pass filter 7.

Figure 4 shows an example of a receiving system in the case of a two-input method.The UHF antennas 23 and 25 are the same as in Figure 3, but the VHF antenna 26 is equipped with a mixer, and one UHF antenna The output of 23 is connected to the mixing input terminal of VHF antenna 26. The mixed output terminal of the VHF antenna 26 is supplied to the first input terminal 2 of the booster 1, and the output of the UHF antenna 25 is supplied to the third input terminal 4. At this time, the switch circuits 12 and 14 of the booster 1 short-circuit the contacts b and c of the switch circuit 12, and short-circuit the contacts a and b of the switch circuit 14. Therefore, the television signal in the VHF band and UHF band mixture inputted to the first input terminal 2 is passed through the high-pass filter 5 and the low-pass filter 1 having the characteristics shown by the broken line 28 in FIG.
1, and this low pass filter 11
The VHF band signal is demultiplexed and output, and further sent to an output terminal 10 through a switch circuit 12 and a low-pass filter 7. The UHF band signal that has passed through the high-pass filter 5 is output from the output terminal 10 via the above-mentioned path.

Figure 5 also shows an example of a receiving system in the case of a two-input method, but in this case, two UHF antennas are used.
5 is supplied to the mixing input end of the VHF antenna 26, and from the mixing output end of this VHF antenna 26.
It transmits television signals in a mixture of UHF and VHF bands. And this VHF antenna 2
The mixing output terminal of 6 is the second input terminal 3 of booster 1.
The output terminal of the UHF antenna 23 is connected to the first input terminal 2 of the booster 1. Regarding the switch circuits 12 and 14, the switch circuit 12 short-circuits the contacts a and b, and the switch circuit 14 short-circuits the contacts a and b. Short-circuit between contacts b and c. Therefore, the UHF band television signal input to the first input terminal 2 is outputted to the output terminal 10 through the high-pass filter 5, the amplifier circuit 6, the high-pass filter 5', and the high-pass filter 9. On the other hand, the second input terminal 3
The entered television signal containing a mixture of VHF and UHF bands enters a low-pass filter 7 and a high-pass filter 13 having the characteristics shown by the dashed line 29 in FIG. 2, where the UHF band signal is demultiplexed and output. is further passed through a band pass filter 8 and a high pass filter 9 to the output terminal 1.
Output to 0. from low pass filter 7
The VHF band signal is as described above.

Fig. 6 shows an example of a receiving system in the case of a single input method. In the figure, 27 is a UHF/VHF common antenna, and is further equipped with a mixer for mixing with other signals from other antennas. This UHF,
The mixed output end of the VHF common antenna 27 is connected to the first input terminal 2 of the booster 1. Of course, the UHF antenna 2 is at the mixing input end of this antenna 27.
The output end of 3 is connected. Here, booster 1
The switch circuits 12 and 14 both have contacts b and c.
short-circuit the gap. At this time, the television signal input to the first input terminal 2 enters the high-pass filter 5 and the low-pass filter 11, and the path from the high-pass filter 5 to the high-pass filter 9 is
Output terminal 1 through which the higher signal in the UHF band passes
Output to 0. On the other hand, the lower UHF band signal and the VHF band signal pass through the low-pass filter 11, and the VHF signal is sent to the output terminal 10 through the switch circuit 12 and the low-pass filter 7. , a bandpass filter 8, and a highpass filter 9, and the UHF signals are outputted to an output terminal 10, respectively.

As explained above, according to the present invention, various receiving systems can be constructed simply by operating the switch circuit in the booster, which is extremely convenient in practice.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an input device of a multidirectional reception booster according to an embodiment of the present invention, FIG. 2 is a frequency characteristic diagram of each filter circuit in FIG. 1, FIGS. 3, 4, and 5. , and FIG. 6 are diagrams each showing an example of a receiving system configured using the present invention. 1... Booster, 2, 3, 4... Input terminal,
5, 5', 9, 13...high pass filter, 7,
11...Low pass filter, 8...Band pass filter, 10...Output terminal, 12, 14...Switch circuit.

Claims (1)

[Claims] 1. A first low-pass filter circuit 1 that passes a VHF band television signal to a first input terminal 2.
One terminal 12c of the first switch circuit 12 is connected to the output terminal of the first low-pass filter circuit 11, and the other terminal 12a of the first switch circuit 12 is connected to the input terminal of the first switch circuit 12.
A second input terminal 3 is connected to the intermediate terminal 12 of the first switch circuit 12.
b an input terminal of the second low-pass filter circuit 7;
An input terminal of a first high-pass filter circuit 13 that passes a UHF band television signal is connected to the output terminal of the first high-pass filter circuit 13, and one terminal 14c of a second switch circuit 14 is connected to the output terminal of the first high-pass filter circuit 13. The other terminal 14 of the second switch circuit 14
a third input terminal 4 is connected to the intermediate terminal 14 of the second switch circuit 14.
an input end of a band pass filter circuit 8 is connected to b, an input end of a second high pass filter circuit 5 that passes a UHF band television signal is connected to the first input terminal 2, and the second high pass filter A third filter is connected to the output terminal of the circuit 5 and the output terminal of the bandpass filter circuit 8.
An input terminal of the high-pass filter circuit 9 is connected to the output terminal of the second low-pass filter circuit 7 and an output terminal of the third high-pass filter circuit 9, and an output terminal 10 is connected to the output terminal of the second low-pass filter circuit 7 and the third high-pass filter circuit 9. UHF antennas 23 and 25 are connected to the second and third input terminals 4, respectively, a VHF antenna 24 is connected to the second input terminal 3, and the first and second switch circuits 12 and 14
The other terminals 12a, 14a and the intermediate terminal 12
b, 14b are each short-circuited, and a VHF antenna 26 with a mixer is connected to the first input terminal 2, and a UHF antenna 23 is connected to the mixer input end of this VHF antenna 26. ,
A UHF antenna 25 is connected to the third input terminal 4, one terminal 12c of the first switch circuit 12 and the intermediate terminal 12b are short-circuited, and the other terminal 14a of the second switch circuit 14 is short-circuited. A first two-input reception mode in which the intermediate terminal 14b is short-circuited, and a UHF antenna 23 is connected to the first input terminal 2, and a mixer is attached to the second input terminal 3.
A VHF antenna 26 is connected, a UHF antenna 25 is connected to the mixer input end of this VHF antenna 26, the other terminal 12a of the first switch circuit 12 and the intermediate terminal 12b are short-circuited, and the second A second two-input receiving mode in which one terminal 14c and an intermediate terminal 14b of the switch circuit 14 are short-circuited; and UHF with a mixer at the first input terminal 2;
The VHF common antenna 27 is connected, and this UHF,
A UHF antenna 23 is connected to the mixer input end of the VHF common antenna 27, and one terminal 12c, 14c of the first and second switch circuits 12, 14 and intermediate terminals 12b, 14b are short-circuited, respectively. An input device for a multidirectional reception booster, characterized in that an input method and reception form can be selected.