JP2003304512A - Booster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a booster capable of simply and inexpensively repairing or rebuilding up a community reception system in the case of introducing a multi-channel design and a two-way CATV system to the community reception system. <P>SOLUTION: In the case of repairing or rebuilding up a particular transmission system such as shift from the community reception system to a CATV system or the like, the booster applied to a transmission line of the system is realized to have a desired signal amplifying function by providing a plurality of signal amplifier sections AP<SB>dw</SB>, AP<SB>vh</SB>, AP<SB>uh</SB>and applying switch control to switches SW1, SW2 to selectively connect the signal amplifier section AP<SB>dw</SB>or the signal amplifier sections AP<SB>vh</SB>, AP<SB>uh</SB>to its circuit so as to cope with revision of circuit functions in response to each signal processing specification. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a booster,
In particular, the present invention relates to a booster that is suitable for use in transmission lines such as co-listening reception equipment and cable television systems.

[0002]

2. Description of the Related Art Conventionally, in a co-listening reception system for television broadcasting signals etc. installed in buildings and condominiums, co-listening from broadcasting signal reception equipment to terminal equipment such as audiovisual equipment installed in each dwelling unit or living room. In Japan, the allocation of the signal frequency of the broadcast signal transmitted on the line (transmission path) is
As shown in FIG. 12, in VHF broadcasting using analog broadcasting signals by terrestrial waves, approximately 70 to 222 MHz, UH
In F broadcasting, it is set to approximately 470 to 770 MHz, and BS that uses broadcasting signals from broadcasting satellites and communication satellites.
It is generally set to 1035 to 2150 MHz for broadcasting and CS broadcasting. Here, in Japan, for terrestrial television broadcasting, 7 channels are set in the frequency band of VHF broadcasting, and 2 channels are set in the frequency band of UHF broadcasting.
The channel is set.

In such a co-listening reception system,
In order to compensate for the transmission loss of the signal in the transmission cable forming the co-listening line, each signal is provided with a predetermined amplification factor or gain corresponding to the frequency of the broadcast signal as shown in FIG. A booth (amplifying device) for amplification processing is installed. Here, a schematic configuration of the booster applied to the amplification processing of the VHF and UHF broadcast signals is, for example, as shown in FIG. 13, an input terminal Tin to which a transmission cable on the broadcast signal receiving equipment side of the co-listening reception system is connected.
And output terminal Tou to which the transmission cable of each dwelling unit is connected
Between t and t, the input terminal Tin and the output terminal Tout are individually connected to each other, and the band pass characteristic (approximately 7) corresponding to the signal frequency allocation of the VHF broadcast signal shown in FIG.
A pair of filters Fva, Fvb having 0 to 222 MHz)
And a signal amplification unit APv that is connected between the filters Fva and Fvb and that amplifies the VHF broadcast signal at a predetermined amplification factor,
Band-pass characteristics (generally 470 to 770) individually connected to the input terminal Tin and the output terminal Tout and corresponding to the allocation of the signal frequency of the UHF broadcast signal shown in FIG.
MHz) having a pair of filters Fua and Fub, and a signal amplifier APu that is connected between the filters Fua and Fub and that amplifies the UHF broadcast signal at a predetermined amplification factor. The signal amplification units APv and APu are
Specifically, for example, as shown in FIG. 13, it is configured by appropriately connecting an attenuator ATT for level adjustment, an amplifier, a gain controller GC, and the like.

Further, in recent years, in Japan, a large-scale new town where a large number of detached houses are lined up, a complex new town including an apartment complex, or as a communication means in a local city, etc., in a predetermined area or a residential ridge. Multiple dwelling units and cable TV (hereinafter referred to as "CAT
Connected to a center station via a cable network (for example, optical / coaxial transmission cable network),
In addition to broadcasting over 100 channels, various information related to the occurrence of abnormal situations such as fires, gas leaks, intrusion of suspicious persons from security sensors installed in each dwelling unit, and centralized management at the CATV center station side Security connection, communication connection for sending and receiving various information by connecting information communication terminals such as personal computers installed in each dwelling unit to the telecommunications network such as the Internet or public telephone network via the CATV center station. Bi-directional CAT for bi-directional transmission of information and signals such as services
The introduction of the V system (hereinafter referred to as "two-way CATV system") is progressing.

Here, the signal transmitted and received via the transmission cable laid between each dwelling unit and the CATV center station is specifically about 55 MHz as shown in FIG.
The following signal frequencies are set for upstream lines, request signals are sent from each dwelling unit to the CATV center station, and information provided via the Internet is sent and received, while signals of approximately 70 to 770 MHz are sent. The frequency is set for the downlink, and broadcast signals of about 100 channels are transmitted. The signal transmitted via the transmission cable is such that the request signal, the Internet information, and the like are transmitted based on the frequency width of 6 MHz assigned to the television broadcast signal for one channel.

Also in such a bidirectional CATV system, in order to compensate for the transmission loss of the signal in the transmission cable, as in the co-listening reception system described above,
Bidirectional booths (signal amplifiers) for amplifying each signal with a predetermined amplification factor or gain corresponding to the frequency of the transmission signal as shown in FIG. 14 are installed at various places along the transmission path. Here, the schematic configuration of the booster applied to the signal amplification processing in the bidirectional CATV system is, for example,
As shown in FIG. 15, the CAT of the interactive CATV system
Connection terminal T to which the transmission cable on the V center station side is connected
Connection terminal T to which pa and the transmission cable on each dwelling unit side are connected
Between pb, a pair of filters Fuc, Fud which are individually connected to each of the connection terminal Tpa and the connection terminal Tpb and have a bandpass characteristic (approximately 55 MHz or less) corresponding to the signal frequency for the uplink shown in FIG. And the signal processing unit CTu that is connected between the filters Fuc and Fud and that amplifies the signal component of the uplink with a predetermined amplification factor, and is individually connected to each of the connection terminal Tpa and the connection terminal Tpb. A pair of filters Fdc and Fdd having a band pass characteristic (approximately 70 MHz or more) corresponding to the downlink signal frequency shown in FIG.
And a signal processing unit CTd that is connected between the filters Fdc and Fdd and that amplifies the signal component of the downlink with a predetermined amplification factor,
It has a configuration including. The signal processing unit CTu,
Specifically, CTd is, for example, as shown in FIG.
Attenuator ATT, amplifier, gain controller G
C, a tilt circuit TILT for correcting the frequency dependent characteristic of the signal level, and the like are appropriately connected.

[0007]

However, in the booster applied to the above-mentioned co-listening reception system and the two-way CATV system (particularly, the booster installed in the co-listening reception system), the following is shown. I have a problem. (1) That is, in Japan, with the start of terrestrial digital broadcasting using digital broadcasting signals scheduled for the year 2003 (2003) and later, VHF,
Multi-channel UHF broadcasting (for example, current UHF2
16 to more channels) are planned. Therefore, due to such changes in signal specifications due to digital broadcasting, the booster installed in the existing co-listening reception system cannot be used, and it is necessary to replace all the devices with new signal specifications and other compatible devices. .

(2) In addition, in the existing co-listening reception system (that is, a network system that transmits signals and information only in one direction), a two-way CATV capable of providing a variety of services in addition to providing multiple channels When considering the introduction of the system, as in the case of (1) above, the existing booster cannot be used, so it is necessary to replace it with a device compatible with bidirectional signal transmission. In an extremely rare case, the existing bidirectional booster cannot be used even in the case of introducing a co-listening reception type network system in a bidirectional or unidirectional CATV system, so it is necessary to replace the device. There is. Therefore, in both cases (1) and (2) above,
There has been a problem that a large amount of cost and complicated work are required due to equipment refurbishment, etc., and it is not possible to quickly and easily respond to user requests.

In view of the above problems, the present invention provides a simple and inexpensive system when, for example, a multi-channel terrestrial digital broadcasting system or a bidirectional CATV system is introduced in a co-listening reception system. The purpose is to provide a booster that can be refurbished or rebuilt.

[0010]

A booster according to the present invention is a booster installed on a transmission path of a specific transmission system, wherein the first booster corresponds to a predetermined signal processing specification on the transmission path. Corresponding to the circuit function section and other signal processing specifications different from the above signal processing specifications 1
Alternatively, a plurality of second circuit function units, a switching mechanism unit that selectively connects the first circuit function unit and the second circuit function unit, the first circuit function unit, and the second circuit A frequency band limiting unit that is commonly connected to both the function units and limits the frequency band of the input / output signals to / from the first circuit function unit and the second circuit function unit, and the switching mechanism unit. And a single third circuit function unit commonly connected to both the first circuit function unit and the second circuit function unit.

A booster according to a second aspect of the present invention is the booster according to the first aspect, wherein the first circuit function section and the second circuit function section are connected in parallel in advance. The switching mechanism section is characterized by selectively switching and connecting the first circuit function section and the second circuit function section. A booster according to a third aspect of the present invention is the booster according to the first aspect, wherein the switching mechanism unit is configured such that either one of the first circuit function unit and the second circuit function unit is detachable. It is characterized by having a connected configuration.

A booster according to a fourth aspect of the present invention is the booster according to any one of the first to third aspects, wherein the specific transmission system is at least V in Japan.
A co-listening reception system including equipment for receiving an HF broadcast signal and a UHF broadcast signal, wherein the first circuit function unit is the VH in a transmission path of the co-listening reception system.
The second circuit function section has a signal amplification function of compensating for transmission loss of F and UHF broadcast signals, and the second circuit function section has a signal amplification function of compensating for transmission loss of a signal component of a downlink in a transmission path of a cable television system. It is characterized by being.

A booster according to a fifth aspect of the present invention is the booster according to the fourth aspect, wherein the frequency band limiting means is the VHF or UH in the co-listening reception system.
It is characterized in that it has a bandpass characteristic for commonly passing a frequency band including an F broadcast signal and a signal component in a frequency band including a downlink signal component in the cable television system.

A booster according to a sixth aspect of the present invention is the booster according to any one of the first to fifth aspects, wherein the booster is input to either one of the first circuit function section and the second circuit function section. Based on the signal amplification function provided in each of the first circuit function section and the second circuit function section and the signal amplification function provided in the third circuit function section, The feature is that signals are amplified in multiple stages. .

That is, the booster according to the present invention can cope with a change in the circuit function that is assumed in advance when the specific transmission system is modified or reconstructed, for example, when the co-listening reception system or the like is changed to the CATV system or the like. As described above, a plurality of circuit function units (first and second circuit function units; signal processing units such as a signal amplification unit) according to specifications of each signal processing are provided,
By operating the switching mechanism (switch etc.),
Selectively connect any circuit function part (switch connection)
In this way, a desired signal processing function is realized.

Thus, by operating the switching mechanism unit to selectively connect any of the circuit function units (first or second circuit function unit), for example, VHF and UHF broadcasting in the co-listening reception system. Since the circuit function for amplifying the signal and the circuit function for amplifying the signal component of the downlink in the CATV system can be arbitrarily switched, the booster according to the present invention is installed in advance everywhere in the transmission path. Everything, from the co-listening reception system to CAT
By switching the function of the booster at the time of repairing or rebuilding the V system or the like, it is possible to easily and inexpensively construct the desired system without the need to replace the booster.

Here, the plurality of circuit function sections (first and second circuit function sections) provided in the booster and selectively connected by the switching mechanism section are included in substantially equal frequency bands. It is configured to perform predetermined signal processing on the signal component, and is provided with at least a common frequency band limiting unit (filter) for extracting a signal component included in the frequency band from the input signal. Configurations can be applied. According to this, since the functional elements (filters, output amplifiers, connection terminals, etc.) other than the plurality of circuit function sections according to the different signal processing specifications can be used in common by a single configuration, the booster can be used. It is also possible to reduce the product cost while simplifying the circuit configuration of.

Further, the switching mechanism section for selectively connecting the plurality of circuit function sections (first and second circuit function sections) includes, for example, a plurality of circuit function sections previously provided in parallel with the booster, A switch such as a high-frequency relay that controls switching to select one may be applied, or each circuit function unit may be configured as an independent circuit unit and a circuit unit having an arbitrary circuit function may be attached / detached. A structure such as a circuit unit mounting portion for exchanging the same may be applied.

Further, in the booster according to the present invention, the signal processing in each circuit function unit (first and second circuit function units) is performed on the input signal, and the third booster is commonly provided in each circuit function unit. By performing both of the signal processing in the circuit function unit (output amplifier, etc.), the desired signal processing function is realized. Thereby, for example, after the first stage signal amplification processing is performed by the first or second circuit function unit (signal amplification unit), the third circuit function unit (output amplifier) commonly provided to each circuit function unit. Since the configuration of a plurality of stages of amplifiers can be applied so that the signal amplification process of the next stage is performed, it is possible to reduce signal noise and improve the circuit characteristics of the booster.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. <First Embodiment> FIG. 1 is a schematic structural view showing a first embodiment of a booster according to the present invention. The present embodiment will be described with reference to the circuit configuration (FIGS. 13 and 15) and the allocation of signal frequencies (FIGS. 12 and 14) in the above-described related art, as necessary.

The booster according to this embodiment is schematically shown in FIG.
As shown in FIG. 2, the connection terminal Ta to which the transmission cable of the broadcast signal receiving equipment side of the joint reception system (transmission system) or the CATV center station side of the CATV system (transmission system) is connected, and the joint reception system or CATV system. Corresponding to the signal frequency assigned to the BS / CS broadcast signal shown in FIG. 12 which is individually connected to each of the connection terminals Tb and the connection terminals Ta and Tb to which the transmission cable of each dwelling unit side is connected. Pair of filters (frequency band limiting means) FH11, FH having the bandpass characteristics described above
12 and the filters FH11 and FH12,
A signal amplifying unit APbc for amplifying a BS / CS broadcast signal at a predetermined amplification rate, and the connection terminals Ta and Tb are individually connected to at least the VH shown in FIG. 12 described above.
A pair of filters (frequency band limiting means) FL11 and FL12 having band pass characteristics corresponding to signal frequencies assigned to F and UHF broadcast signals, and the filter FL1.
1 and FL12 individually connected to each of the above-described FIG.
A pair of filters (frequency band limiting means) FL21 and FL22 having band pass characteristics corresponding to the signal frequency for the upstream line of the CATV system shown in FIG.
21 and FL22, which are individually connected to each of the above-mentioned filters FL11 and FL12, and the signal amplification unit APup for amplifying the signal component of the uplink with a predetermined amplification factor, and the VHF shown in FIG. A pair of filter (frequency band limiting means) FH21 and FH22 having band pass characteristics corresponding to the signal frequency assigned to the UHF broadcast signal or the signal frequency for the downlink of the CATV system shown in FIG. , A switch (switching mechanism section) SW1 which is connected to the fill FH21 and has at least contacts Na and Nb, and the fill FH2.
2 is connected via an output amplifier (third circuit function unit) APo to 2, and a switch (switching mechanism unit) SW2 having at least contacts Na and Nb, and the switches SW1 and SW1.
A signal amplification unit (second circuit function unit) APdw that is connected to the contact Na side of W2 and that amplifies the transmission signal of the downlink of the CATV system with a predetermined amplification factor, and the switch SW.
1, a pair of filters (frequency band limiting means) FL31, FL32 connected to the contact Nb side of SW2 and having band pass characteristics corresponding to the signal frequency assigned to the VHF broadcast signal shown in FIG. The Phil Yu FL3
A signal amplification unit (first circuit function unit) A that is connected between the first and the second FL 32 and that amplifies the VHF broadcast signal with a predetermined amplification factor.
Pvh and a pair of (frequency band limiting means) filters connected to the contacts Nb side of the switches SW1 and SW2 and having a band pass characteristic corresponding to the signal frequency assigned to the UHF broadcast signal shown in FIG. 12 described above. FH31, FH
32 and the FIL31 FH31, FH32,
A signal amplification unit (first circuit function unit) APuh for amplifying a UHF broadcast signal with a predetermined amplification factor, and the filter FL1.
2 and FH12 and a connection terminal Tb, which are connected via a demultiplexing mixer, and a monitor terminal Tm as a signal level test terminal.

That is, with the switches SW1 and SW2 as base points, a signal processing path consisting of a filter FL31, a signal amplifier APvh, and a filter FL32, and a filter FH3.
1, a signal amplification section APuh, and a signal processing path including a filter FH32 are fixedly connected in parallel to each other, and further, these signal processing paths and the signal amplification section AP
The switches SW1 and S are connected in parallel with dw
Either processing path is selected by the switching operation of W2.

Here, the above-mentioned signal amplifiers APdw, AP
vh and APuh are preamplifiers PAd, PAv, PA
u, a gain controller GC, an attenuator ATT, etc. are connected as appropriate, and a signal input through each of the above filters is subjected to first-stage signal amplification processing with a predetermined amplification factor, and further, a switch SW2 and a filter. These signal amplification units APdw, APvh, and APuh are provided between the FH22 and the FH22.
The output amplifier APo connected in common to performs the signal amplification process of the next stage. As a result, the preamplifier PA
Based on the amplification factors set in d, PAv, PAu and the output amplifier APo, the signal amplification process is performed in multiple stages so that the input signal has a desired amplification factor.

Next, the bandpass characteristics (filter characteristics) of each filter applied to the booster according to this embodiment will be described in detail. 2 to 4 are signal waveform diagrams showing an example of bandpass characteristics of each filter applied to the booster according to the present embodiment. In the booster having the above-described configuration, the band passability set in each of the pair of filters FL11, FL12 and the filters FH11, FH12 is as follows:
As shown in FIG. 2 (a), it has a function as a low-pass filter that passes only a frequency band of approximately 770 MHz or less, and in the filters FH11 and FH12, as shown in FIG. It is set to have a function as a high-pass filter that passes only the frequency band of 1035 MHz or higher. That is, a pair of filters FL11, FL12 and filter FH11,
In the FH12, the signal frequency assigned to the BS / CS broadcast signal (see FIG. 12) and other signals (VHF,
It has a role of separating the signal frequency of the UHF and CATV upstream lines.

A pair of filters FL21 and FL22 are also provided.
The band passability set in each of the filters FH21 and FH22 is a function as a low-pass filter that passes only a frequency band of approximately 55 MHz or less in the filters FL21 and FL22 as shown in FIG. In addition, the filters FH21 and FH22 are set to have a function as a high-pass filter that passes only a frequency band of approximately 70 MHz or higher, as shown in FIG. 3B. That is, a pair of filters FL21, FL22 and filters FH21, FH
In No. 22, the signal frequency for the uplink of the CATV system (see FIG. 14) and other signals (VHF, UHF,
It has a role of separating the signal frequency of the CATV upstream line).

Further, a pair of filters FL31, FL3
2 and the filters FH31 and FH32, the band pass characteristics of the filters FL31 and FL32 are, as shown in FIG. 4 (a), a low-pass filter that passes only a frequency band of approximately 470 MHz or less. In addition, the filters FH31 and FH32 are set to have a function as a high-pass filter that passes only a frequency band of approximately 470 MHz or higher, as shown in FIG. 4B. That is, the pair of filters FL31, FL32 and the filter FH31,
The FH 32 has a role of separating the signal frequency assigned to the VHF broadcast signal (see FIG. 12) from the signal frequency assigned to the UHF broadcast signal.

Here, as shown in FIGS. 12 and 14, the signal frequency assigned to the VHF and UHF broadcast signals and the signal frequency for the downlink of the CATV system are both approximately 70 to 770 MHz. Since the frequency bands are set to be substantially equal, the pair of filters FL1
1, FL12 and filters FH21, FH22,
Only by passing the signal input through the connection terminal Ta through the filter, only the VHF and UHF broadcast signals or the downlink signal components of the CATV system are extracted, and the respective signal amplification units APvh, APuh. , APdw performs signal amplification processing at a desired amplification factor.

Next, the operation of the booster according to this embodiment will be described in detail while showing a specific example of the switching mechanism of the signal amplification unit applied to the booster according to this embodiment. FIG. 5 is a main-part configuration diagram showing an example of a switching mechanism of the signal amplification unit applied to the booster according to the present embodiment. In addition, here, the signal amplifier APdw shown in FIG.
APvh and APuh are shown in a simplified manner. 6 is a schematic diagram showing a first connection state of the booster according to this embodiment, and FIG. 7 is a schematic diagram showing a second connection state of the booster according to this embodiment.

The essential portion of the booster according to this embodiment is, for example, as shown in FIG. 5, constituted by a high frequency relay having contacts Na and Nb, respectively, and these contacts Na and Nb are electrically synchronized and are the same. A switch S for selectively connecting either the signal amplification unit APdw or one of the signal amplification units APvh and APuh by controlling the switching in the direction.
W1 and SW2 and a control signal (switching drive power) for switching control of these switches SW1 and SW2 are supplied, and a signal amplification section (selectively connected according to the switching control of the switches SW1 and SW2) ( Power supply switch SWp for supplying signal amplification drive power only to a preamplifier or the like).

In such a configuration, when the power supply switch SWp is switched to the contact N1 side by a control signal (not shown), drive power is supplied only to the signal amplifier APdw via the power supply switch SWp. The signal amplification unit APdw is in a driving state. On the other hand, since the contact N2 side is electrically disconnected, the switches SW1 and SW2 (high frequency relays) and the signal amplification units APvh and A
No driving power is supplied to Puh.

As a result, between the contacts Tain and Tbout,
The circuit configuration is such that only the signal amplification unit APdw and the output amplifier APo connected to the contact Na side are connected, and the contact Tain
The signal input via the signal amplification unit APdw (preamplifier PAd) is subjected to the first-stage signal amplification processing,
The output amplifier APo performs signal amplification processing in the next stage, and as a result, desired signal amplification processing is performed, and the contact Tbout
Is output via. That is, the switches SW1 and S
When the signal amplification unit APdw connected to the contact Na side of W2 is selected, the signal amplification unit A connected to the contact Nb side is selected.
Pvh and APuh are set in a state where the signal path is terminated and the circuit function is completely stopped. Therefore, the signal amplification unit APdw and the signal amplification units APvh and APuh are not amplified in the same band, isolation on the circuit is obtained, and problems such as oscillation do not occur.

Therefore, in the state where the switches SW1 and SW2 are switched to the contact Na side, the booster shown in FIG. 1 is connected to the connection terminal T substantially as shown in FIG.
A signal amplification unit APbc for BS / CS broadcast signals connected between a and Tb via filters FH11 and FH12.
And filters FL11, FL12 and filter FL2
1, a signal amplification unit APup for the upstream line of the CATV system connected via FL22, and filters FL11, F
The L12 and the filters FH21 and FH22 and the switch SW1 and SW2 are connected to each other to have the circuit configuration including the signal amplification unit APdw for the downlink of the CATV system, and the signal input from the connection terminal Ta or Tb is , Each signal processing unit APbc, AP by each of the above filters
Only the signal component (frequency band) corresponding to up and APdw is passed (band-limited) and supplied, and a predetermined signal amplification process is performed.

Therefore, at this time, a signal (CATV) having a specific signal frequency is generated between the connection terminals Ta and Tb.
The signal components (uplink and downlink signal of the system) are amplified through the respective signal amplifiers, respectively, from the connection terminal Ta side to the connection terminal Tb direction (downlink direction) and from the connection terminal Tb side to the connection terminal Ta. Since it will be transmitted bidirectionally in the direction (uplink direction), a good booster can be realized by installing it on the transmission path (transmission cable) laid between the CATV center station of the bidirectional CATV system and each dwelling unit. It

The power supply switch SWp is connected to the contact N2.
When switched to the side, drive power is supplied to the switches SW1 and SW2 (high-frequency relays) and the signal amplification units APvh and APuh via the power supply switch SWp, so that the signal amplification units APvh and APuh are brought into a drive state. On the other hand, since the contact N1 side is electrically disconnected, drive power is not supplied to the signal amplification unit APdw.

As a result, between the contacts Tain and Tbout,
The circuit configuration is such that only the signal amplification units APvh, APuh and the output amplifier APo connected to the contact Nb side are connected, and the signal input through the contact Tain is the signal amplification unit APv.
After the signal amplification processing of the first stage is performed by h, APuh (preamplifiers PAv, PAu), the signal amplification processing of the next stage is performed by the output amplifier APo, and as a result, the desired signal amplification processing is performed and the contact Tbout Is output via. That is, in a state in which the signal amplification units APvh and APuh connected to the contacts Nb side of the switches SW1 and SW2 are selected, the signal amplification unit APdw connected to the contacts Na side has a signal path terminated and complete circuit function. Is set to a stopped state.

Therefore, in the state where the switches SW1 and SW2 are switched to the contact Nb side, the booster shown in FIG. 1 has the connection terminal T as shown in FIG.
A signal amplification unit APbc for BS / CS broadcast signals connected between a and Tb via filters FH11 and FH12.
And filters FL11, FL12 and filter FL2
1, a signal amplification unit APup for the upstream line of the CATV system connected via FL22, and filters FL11, F
L12 and filters FH21 and FH22, and a circuit configuration including signal amplification units APvh and APuh for VHF and UHF broadcast signals connected through switches SW1 and SW2 are provided, and input from connection terminal Ta or Tb. The signal is output to each signal processing unit APb by each filter described above
Only signal components (frequency bands) corresponding to c, APup, APvh, and APuh are passed (band-limited) and supplied,
A predetermined signal amplification process will be performed.

Therefore, at this time, a signal (VHF, VHF having a specific signal frequency between the connection terminal Ta and the connection terminal Tb).
UHF broadcast signals and BS / CS broadcast signals) are amplified through the respective signal amplifiers and transmitted from the connection terminal Ta side toward the connection terminal Tb. Therefore, the broadcast signal receiving equipment in the co-listening reception system. A good booster can be realized by installing it on a transmission path (transmission cable) laid between each dwelling unit.

According to the booster having the above-mentioned configuration and operation mode, the switches SW1 and SW2 are selectively controlled to the Na contact side or the Nb contact side to thereby transmit the VHF and UHF broadcast signals in the co-listening reception system. Since it is possible to switch and control either the signal path for signal amplification processing or the signal path for signal amplification processing of the downlink signal component in the CATV system, the booster according to the present embodiment is installed in advance everywhere in the transmission path. In this way, the co-listening reception system capable of receiving VHF, UHF broadcast signals and BS / CS broadcast signals can be used for bidirectional CAT.
At the time of repairing or reconstructing the V system (or vice versa), the function of the booster can be switched and the desired system can be constructed easily and inexpensively without the need to replace the booster.

Further, a high frequency relay is applied as the switches SW1 and SW2 for switching the function of the booster to selectively connect the signal amplifying unit APdw or the signal amplifying units APvh and APuh and to the signal amplifying unit on the non-selected side. Since it is configured to cut off the driving power, it is possible to satisfactorily secure the electrical isolation that accompanies the switching of the signal path, without being electrically affected by the signal amplification section on the non-selected side. The signal amplification unit on the selection side can perform good signal amplification processing. At this time, for example, the switches SW1 and SW2 provided in the plurality of boosters whose installation positions are close to each other on the transmission path are controlled by a single control signal (control signal of the power supply switch SWp shown in FIG. 5).
By configuring the switching control according to the applied state of, it is possible to more easily and inexpensively modify or reconstruct the system.

Further, the signal amplification function of the booster according to the present embodiment is first subjected to the first stage signal amplification processing by the preamplifier provided in each signal amplification section selectively connected by the switches SW1 and SW2. Since the output amplifier provided in common to each of the signal amplifying units performs the signal amplification process of the next stage, the amplifier configuration has a plurality of stages, so that the signal characteristics are reduced and the booster circuit characteristics ( C / N) can be improved. In addition, since the amplification factor and gain of the amplifier (preamplifier) provided in each signal amplification unit can be set low, the circuit cost of each signal amplification unit can be reduced, and thus the booster product cost can be kept low. You can

Next, regarding another configuration example of the present embodiment,
A description will be given with reference to the drawings. In the booster according to the above-described embodiment, the co-listening reception system capable of receiving the VHF, UHF broadcast signal and the BS / CS broadcast signal by switching the signal path with the switch, and the bidirectional CA.
The case where the signal amplification function corresponding to any of the TV systems is realized has been described, but the present invention is not limited to this. That is, it may have a signal amplifying function corresponding to a co-listening reception system capable of receiving only VHF and UHF broadcast signals and a bidirectional CATV system, or may be a VHF, UHF broadcast signal and a BS / CS broadcast signal. One-way CATV and co-listening reception system capable of receiving data
It may have a signal amplification function corresponding to the system.

FIG. 8 shows a booster according to the present embodiment,
9 is a schematic configuration diagram of a case where a co-listening reception system capable of receiving only HF and UHF broadcast signals and a signal amplification function corresponding to a bidirectional CATV system are provided;
FIG. 6 is a signal waveform diagram showing an example of bandpass characteristics of each filter applied to the booster according to the present configuration example. The same components as those in the above-described embodiment (FIG. 1) are designated by the same reference numerals, and the description thereof will be simplified or omitted.

The booster according to the present configuration example is roughly connected to each of the connection terminals Ta and Tb individually as shown in FIG. 8 and has a pair of filter FL2 having a predetermined band pass characteristic.
1, FL22, the signal amplifier APup connected between the filters FL21 and FL22, and the connection terminals Ta and Tb.
Of the VH shown in FIG.
A pair of filters FH21 and FH22 having band pass characteristics corresponding to the signal frequencies assigned to the F and UHF broadcast signals or the signal frequencies for the downlink of the CATV system shown in FIG. FH2
1 is connected to the switch SW1 having at least the contacts Na and Nb, and is connected to the above-mentioned filter FH22 via the output amplifier APo, and at least the contacts Na and Nb.
switch SW2 provided with b, and switches SW1 and SW
The signal amplification unit APdw connected to the contact Na side of 2 and the pair of filters FL31 and FL connected to the contact Nb side of the switches SW1 and SW2 and having a predetermined band pass characteristic.
32, a signal amplifier APvh connected between the filters FL31 and FL32, a pair of filters FH31 and FH32 connected to the contact Nb side of the switches SW1 and SW2 and having a predetermined band pass characteristic, Phil Yu FH3
1 and a signal amplification unit APuh connected between the FHs 32. Where connection terminals, filters,
The configurations of the switch, the signal amplification unit, and the like are the same as those in the above-described embodiment, and thus the description thereof will be omitted.

That is, the booster according to the present configuration example has a pair of filters FL11, FL12 and filters FH11, FH12 in the schematic configuration of the booster shown in FIG.
And signal amplification unit APbc corresponding to BS / CS broadcast signals
Is removed and the pair of connection terminals Ta, Tb
Are each directly connected to the pair of filters FL21, FL22 and filters FH21, FH22. Here, the filters FL21 and FL22 are approximately 55 as shown in FIG. 9A, as in the above-described embodiment.
It has a function as a low-pass filter that passes only the frequency band below MHz, and filters FH21, FH
The H22 is set to have a function as a high-pass filter that passes only the frequency band of approximately 70 to 770 MHz. That is, a pair of fill evening FL2
1, FL22 and filters FH21 and FH22 have a role of separating the signal frequency for the upstream line of the CATV system and the signal frequencies of other signals (VHF, UHF, CATV downlink).

In the booster having such a structure, when the switches SW1 and SW2 are switched to the contact Na side, the connection terminals Ta and Tb are substantially connected.
A signal amplification unit APup for the upstream line of the CATV system connected via filters FL21 and FL22, and
Filters FH21, FH22 and switches SW1, S
The circuit configuration is provided with the signal amplification unit APdw for the CATV system downlink, which is connected via W2, and a good booster is realized by installing it in the transmission path (transmission cable) of the bidirectional CATV system. It

On the other hand, the switches SW1 and SW2 are the contacts N.
In the state where the signal is switched to the b side, the signal amplification unit APup for the upstream line of the CATV system, which is substantially connected between the connection terminals Ta and Tb via the filters FL21 and FL22, and the filters FB21, FB22, and VHF and UH connected via switches SW1 and SW2
Since it has a circuit configuration including the signal amplification units APvh and APuh for the F broadcast signal, it can be installed in the transmission path (transmission cable) of the co-listening reception system to realize a good booster.

Therefore, according to the booster having the above-mentioned configuration and operation mode, the switches SW1 and S1
Since the function of the booster can be switched by selectively controlling W2 to the Na contact side or the Nb contact side, it is possible to replace the existing booster without changing the existing booster.
It is possible to easily and inexpensively upgrade or reconstruct a two-way CATV system (or vice versa) from a co-listening reception system that can only receive HF broadcast signals.

<Second Embodiment> Next, a second embodiment of the booster according to the present invention will be described with reference to the drawings. 10 is a schematic configuration diagram showing a second embodiment of the booster according to the present invention, and FIG. 11 is a schematic configuration diagram showing a configuration example of a circuit unit applied to the booster according to the present embodiment. In addition, about the structure equivalent to 1st Embodiment mentioned above, the same code | symbol is attached | subjected and the description is simplified or abbreviate | omitted and its circuit structure (FIG. 1, FIG.
5) and filter characteristics (band pass characteristics; FIGS. 2 to 4)
Will be described with reference to.

The booster body according to the present embodiment is, as shown in FIG. 10, generally connected to each of the connection terminals Ta and Tb individually, and has the bandpass characteristic shown in FIG. A pair of filters FL11 and FL12, a pair of filters FH11 and FH12 having the band pass characteristic shown in FIG. 2B, and a pair of filters FL21 having the band pass characteristic shown in FIG. 3A. , FL22,
And a pair of filters FH21 and FH22 having the bandpass characteristics shown in FIG. 3B and filters FH11 and FH.
Circuit unit mounting portion (switching mechanism portion) CU1 provided between H12 and circuit unit mounting portion (switching mechanism portion) CU2 provided between the filters FL21 and FL22.
And a circuit unit mounting portion (switching mechanism portion) CU3 and an output amplifier (third circuit function portion) APo provided between the filters FH21 and FH22. Here, the configurations (connection terminals, filters, output amplifiers, etc.) other than the circuit unit mounting portions CU1 to CU3 are the same as those of the above-described first embodiment, and therefore the description thereof is omitted.

The circuit unit mounting portions CU1 to CU3 have a structure in which, for example, a circuit unit having a signal amplifying function, which will be described later, is arbitrarily detachably connected via a connection contact (not shown), Predetermined signal processing (for example, signal amplification processing) is applied to each of the signals input via the connection terminals Ta or Tb. Here, although the mounting of the circuit unit to the circuit unit mounting portions CU1 to CU3 is arbitrarily set, the circuit unit mounting portions CU1 to CU1
The circuit unit may not be connected to all of the CU3. In this case, the connection contact of the circuit unit mounting portion to which the circuit unit is not connected is terminated.

Further, the circuit unit mounting portions CU1 to C
A specific example of the circuit unit detachably connected to U3 is
As shown in FIG. 10, when each filter has the same bandpass characteristics as those of FIGS. 2 and 3 described above, the configuration including the functional element similar to that shown in FIG. 1 is applied. can do. That is, in the circuit unit mounting portion CU1, as shown in FIG. 11 (a), the filter FH1
1. A circuit unit CTbc having a signal amplification function for amplifying an input signal (that is, a BS / CS broadcast signal) whose frequency band is limited by the FH12 at a predetermined amplification factor.
Can be applied, and the circuit unit mounting unit CU
In FIG. 2, as shown in FIG. 11B, the filter F
An input signal (that is, CAT) whose frequency band is limited by H11, FH12 and filters FL21, FL22.
A circuit unit CTup having a signal amplification function for amplifying the signal component of the upstream line of the V system) at a predetermined amplification factor.
Can be applied.

In the circuit unit mounting portion CU3, as shown in FIGS. 11 (c) and 11 (d), the filter FH
11, FH12 and filters FH21 and FH22, the input signal of which the frequency band is limited (that is, CATV
System downlink signal component, or VHF, UHF
A circuit unit (first and second circuit function units) having a signal amplification function of amplifying a broadcast signal) at a predetermined amplification factor.
Either CTdw or CTvu can be applied. Here, the above-mentioned circuit units CTbc, CTup, CTdw,
In the present embodiment, CTvu is configured by appropriately connecting an amplifier, a gain controller GC, an attenuator ATT, a tilt circuit TILT, etc., according to the amplification factor, gain, etc. required in each signal amplification process.

In the present embodiment, when the booster having such a configuration is applied to a co-listening reception system capable of receiving VHF, UHF broadcast signals and BS / CS broadcast signals, for example, a circuit unit. Mounting part CU1
11A, the circuit unit CTbc shown in FIG. 11A is connected, and the circuit unit CTvu shown in FIG. 11D is connected to the circuit unit mounting portion CU3. Thus, in the configuration (see FIG. 1) described in the first embodiment, the booster having a circuit function substantially equivalent to that when the switches SW1 and SW2 are switched to the contact Nb side (see FIG. 7). Can be realized.
Here, the connection contact of the circuit unit mounting portion CU2 to which no circuit unit is connected is terminated by the connection of the dummy resistor.

On the other hand, when the booster configured so as to be applicable to the co-listening reception system capable of receiving the VHF, UHF broadcast signal and the BS / CS broadcast signal as described above is applied to, for example, a bidirectional CATV system, at least,
The circuit unit CTup shown in FIG. 11B is connected to the circuit unit mounting portion CU2, the circuit unit CTvu connected to the circuit unit mounting portion CU3 is removed, and the circuit shown in FIG. Connect the unit CTdw. As a result, in the configuration (see FIG. 1) shown in the above-described first embodiment, the switches SW1 and SW2 are
When the switch is switched to the contact Na side (see FIG. 6), a booster having substantially the same circuit function can be realized.

Therefore, according to the booster having the above-described structure, various types of booster bodies are provided, to which functional elements such as filters are appropriately connected according to the circuit functions expected in the co-listening reception system and the CATV system. It is possible to switch to a booster having an arbitrary circuit function by attaching or detaching the circuit unit of No. 1. Therefore, by installing the booster according to the present embodiment in various places in the transmission path in advance, for example, VHF, UHF broadcasting When the co-listening reception system capable of receiving signals and BS / CS broadcasting signals is modified or reconstructed into another system such as a two-way CATV system (or vice versa), some circuit units of the booster are installed. A desired system can be constructed easily and at low cost simply by exchanging them.

The band pass characteristics of each filter shown in each of the above-described embodiments are merely examples for convenience of explanation, and the present invention is not limited to this. Therefore, a high-pass filter, a low-pass filter, a band-pass filter, or the like may be selected and applied as appropriate according to the circuit function of each signal amplification unit or circuit unit connected between the filters. 1 and 11, a specific configuration example of each signal amplification section or circuit unit applied to each embodiment is shown, but the present invention is not limited to this, and a desired signal amplification may be performed. Needless to say, the number of stages of amplifiers, attenuators, etc., and the connection form may be changed as appropriate in order to realize the function.

Further, in each of the above-described embodiments, the circuit having the signal amplifying function is shown as the signal processing unit connected between the filters, but the present invention is not limited to this. A circuit having a path function or a signal attenuation function may be partially or entirely included. In short, any relay device provided on the transmission path may be used so long as it has a desired signal processing function.

[0058]

According to the booster according to the present invention, it is possible to cope with a change in the circuit function which is assumed in advance when the specific transmission system is modified or reconstructed, for example, when the co-listening reception system or the like is changed to the CATV system or the like. As much as possible, a plurality of circuit function units (first and second circuit units) according to respective signal processing specifications are provided.
Circuit function unit), and switching mechanism unit (switch etc.)
Is configured to selectively connect one of the circuit function units, so that, for example, a circuit function for amplifying the VHF and UHF broadcast signals in the co-listening reception system and a CATV system in the CATV system. A booster equipped with a circuit function for amplifying the signal component of the downlink is installed in advance everywhere in the transmission path, and when the co-listening reception system is modified or reconstructed into a CATV system or the like, By switching the functions, it is possible to easily and inexpensively construct a desired system without the need to replace the booster.

Further, the plurality of circuit function parts (first and second circuit function parts) selectively connected by the switching mechanism part are predetermined with respect to the signal components included in mutually substantially equal frequency bands. The frequency band limiting means (filter) for extracting the signal component included in the frequency band from the input signal can be made common by a single configuration because the signal processing is performed by the booster. It is also possible to reduce the product cost while simplifying the circuit configuration of.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a booster according to the present invention.

FIG. 2 is a signal waveform diagram showing an example (No. 1) of bandpass characteristics of the filter applied to the booster according to the present embodiment.

FIG. 3 is a signal waveform diagram showing an example (No. 2) of bandpass characteristics of the filter applied to the booster according to the present embodiment.

FIG. 4 is a signal waveform diagram showing an example (No. 3) of bandpass characteristics of the filter applied to the booster according to the present embodiment.

FIG. 5 is a main part configuration diagram showing an example of a switching mechanism of a signal amplification unit applied to the booster according to the present embodiment.

FIG. 6 is a schematic diagram showing a first connection state in the booster according to the present embodiment.

FIG. 7 is a schematic diagram showing a second connection state in the booster according to the present embodiment.

FIG. 8 shows a booster according to the present embodiment, which has VHF and UHF.
FIG. 2 is a schematic configuration diagram in the case where a co-listening reception system capable of receiving only broadcast signals and a signal amplification function corresponding to a bidirectional CATV system are provided.

FIG. 9 is a signal waveform diagram showing an example of bandpass characteristics of each filter applied to the booster according to the present configuration example.

FIG. 10 is a schematic configuration diagram showing a second embodiment of the booster according to the present invention.

FIG. 11 is a schematic configuration diagram showing a configuration example of a circuit unit applied to the booster according to the present embodiment.

FIG. 12 is a schematic diagram showing allocation of signal frequencies of broadcast signals transmitted via the co-listening line of the co-listening receiving system.

FIG. 13 is a diagram showing a schematic configuration of a booster applied to the co-listening reception system.

FIG. 14 is a schematic diagram showing signal frequencies of signals transmitted and received via a transmission cable of a CATV system.

FIG. 15 is a diagram showing a schematic configuration of a booster applied to an interactive CATV system.

[Explanation of symbols]

Ta, Tb connection terminals FH11, FH12, FL11, FL12, FH21,
FH22, FL21, FL22, FH31, FH32,
FL31, FL32 filter APbc, APup, APdw, APvh, APuh signal amplifier APo output amplifier SW1, SW2 switch

Claims (6)

[Claims] 1. A booster installed on a transmission path of a specific transmission system, comprising: a first circuit function unit corresponding to a predetermined signal processing specification on the transmission path; and another circuit function section different from the signal processing specification. One or a plurality of second circuit function units corresponding to signal processing specifications; a switching mechanism unit that selectively connects the first circuit function unit and the second circuit function unit; and the first circuit A frequency band limiting unit that is commonly connected to both the functional unit and the second circuit functional unit and limits the frequency band of the input / output signal to / from the first circuit functional unit and the second circuit functional unit. A single third circuit function unit commonly connected to both the first circuit function unit and the second circuit function unit via the switching mechanism unit. And booster. 2. The booster has a configuration in which the first circuit function unit and the second circuit function unit are connected in parallel in advance, and the switching mechanism unit includes the first circuit function unit. 2. The booster according to claim 1, wherein the second circuit function section is selectively switched and connected. 3. The switching mechanism section has a configuration in which one of the first circuit function section and the second circuit function section is detachably connected. The booster according to claim 1. 4. The specific transmission system is a co-listening reception system including at least equipment for receiving VHF broadcast signals and UHF broadcast signals in Japan, wherein the first circuit function unit includes the common listening system. The second circuit functional unit has a signal amplification function of compensating for the transmission loss of the VHF and UHF broadcast signals in the transmission path of the receiving system, and the second circuit function unit compensates the transmission loss of the signal component of the downlink in the transmission path of the cable television system A signal amplifying function for
4. The booster according to any one of 3 to 3. 5. The frequency band limiting means is a signal component of a frequency band including the VHF and UHF broadcast signals in the co-listening reception system and a frequency band including a downlink signal component in the cable television system. 5. The booster according to claim 4, wherein the booster has a band-pass characteristic that allows the components to pass in common. 6. The signal input to one of the first circuit function section and the second circuit function section is the first circuit function section.
Signal amplification function provided in each of the circuit function unit and the second circuit function unit and a signal amplification function provided in the third circuit function unit, and signal amplification is performed in multiple stages. The booster according to any one of claims 1 to 5, which is characterized by the above.