JP2934177B2 - Interactive TV listening facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV system in which a one-way transmission television listening facility of an apartment house is made bidirectional.
The present invention relates to a facility that is connected to a facility or device that performs two-way communication, such as a facility, so that residents of an apartment house can join a CATV facility, and that provides a two-way service in a TV co-listening facility.

[0002]

2. Description of the Related Art Television listening facilities of condominiums such as condominiums receive terrestrial television broadcasts and satellite broadcasts with a common antenna, and then distribute the signals to each dwelling unit in the building using a transmission line. ing.

[0003] In a multi-dwelling house, a facility for listening to television broadcast signals in each dwelling unit is provided with a common antenna 2 as shown in FIG.
At 01, a television broadcast signal is received, amplified by the channel amplifier 202, distributed by the one-way distributors 103 and 104, and output to each dwelling unit via the directional coupler 13 and the wall terminal 11 of each dwelling unit. The resident of each dwelling unit connects the television receiver 17 and the wall surface terminal 11 to receive a television broadcast retransmission service.

[0004] Further, in a two-way type TV listening facility of a newly built apartment house connected to a CATV facility, an up signal transmitted from each dwelling unit subscribing to the CATV facility is a CATV facility.
Use the same frequency band as the upstream signal of the facility.

[0005]

However, in recent years,
CATV facilities have a two-way function in addition to retransmission services for terrestrial television and satellite broadcasting.
There is a tendency to increase the number of CATV facilities that can supply broadcast programs that can be received only from TV facilities and that can provide communication services using interactive functions. To perform these CATV-specific services, CATV facilities use interactive features with subscriber facilities.

[0006] In the case of a multiple dwelling house, if the CATV facility is connected to a television co-listening facility instead of a common antenna of the multiple dwelling house, retransmission of the conventional television broadcast can be viewed. However, the one-way transmission television listening facility has not been able to receive the program supply and the interactive service specific to the CATV facility which requires the interactive function.

[0007] The frequency band of the upstream signal of the CATV facility is
Since 10-50 MHz is used, and this band includes frequencies such as short-wave broadcasting, amateur radio, and citizen band radio, if these signals are mixed into the transmission path of CATV facilities, they will cause interference with upstream signals. Work. On the other hand, short-wave broadcasting, amateur radio,
Frequencies such as citizen band radio are easily mixed. for that reason,
If the frequency band of the upstream signal of the TV co-listening facility is made to coincide with the upstream frequency band of the CATV facility, the influence of the interfering wave mixed into each dwelling unit of the apartment house causes the CAT through the TV co-listening facility.
All merge at the connection point with the V facility, and the transmission quality of the upstream signal of the CATV facility is significantly deteriorated. The effect is
It grows as the apartments rise.

[0008] In order to reduce the influence of the above-mentioned inflow noise and interfering waves, the conventional two-way television co-listening facility has two-way distributors 301 and 302 and a two-way amplifier 303 as shown in FIG. , Non-CATV subscribed dwelling unit 60, receiving-only subscriber equipment by high-pass-filtered bidirectional serial unit 306, CATV subscribed dwelling unit 70 bidirectional serial unit 308
And a two-way home terminal unit 307, and a terminating terminal 90.

[0009] The bidirectional series unit 306 with a high-pass filter is a bidirectional directional coupler 30 having a high shielding property.
4, the high-pass filter 305, and the wall surface terminal 11. Bi-directional serial unit 3 for CATV subscribers
Reference numeral 08 includes the bidirectional directional coupler 304 and the wall surface terminal 11.

In view of the above, the conventional two-way television co-listing facility is characterized in that the upstream signal from each house is directed toward the common transmission / reception point 101 with the CATV facility, so that the noise is also transmitted to the upstream signal transmission quality. Therefore, a device for avoiding deterioration is required, and a construction cost that is higher than that of a conventional one-way television co-listening facility is required.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned points, and a solution thereof is provided by a television / hearing facility for one-way transmission of an apartment house with the following configuration. You. 1. The two-way subscriber equipment of each dwelling unit has a downlink output terminal for receiving a signal transmitted from the CATV facility, an uplink input terminal for transmitting a signal such as data, and a signal transmitted through the terminal to the reception-only subscriber equipment. CAT in signal transmission line
A directional coupler is provided for mixing in the direction in which the downstream signal of the V facility is transmitted. 2 The frequency of the signal transmitted from the upstream input terminal is C
A free frequency in the downstream frequency band is used without matching the upstream frequency band of the ATV facility. 3. At the end of the transmission line, a signal to be transmitted to the upstream frequency of the CATV facility is extracted by an upstream signal converter including a band-pass filter and a frequency converter, and the frequency is converted to the frequency of the upstream signal of the CATV facility. In the upstream direction of the transmission path. 4 When trying to make the TV co-listening facility bidirectional without connecting to a CATV facility, the frequency to be transmitted from each dwelling unit using the configuration of the above-mentioned items 2 and 3 and the frequency converted by the uplink signal converter of the item 4 is The frequency is converted to a vacant frequency within a frequency band used for transmitting a television signal or the like in a television listening facility, and transmitted to each dwelling unit via a reception point of the television listening facility.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. In FIG. 1, a television common listening facility includes a common transmission / reception point 101, a duplexer 102, a transmission line 1 for distributing a down signal 20 of a CATV facility, which is a signal transmitted from the outside, to each dwelling unit, and a common transmission / reception point 101. , The receiving-only subscriber equipment 12 of the non-CATV subscriber door 30 that only receives through
CATV subscriber dwelling units 40 transmitting and receiving through a common transmitting and receiving point
Two-way subscriber equipment 15 and the two-way subscriber equipment 1
5 comprises an upstream signal converter 120 for converting the upstream signal 10 transmitted from 5 into an external upstream signal.

The common transmission / reception point 101 serves as a common transmission point and a common reception point, receives and receives a plurality of signals including an externally transmitted television signal, and receives signals from the two-way subscriber unit 15. The point is that the transmitted uplink signal 10 is transmitted jointly. The duplexer 102 mixes and separates upstream and downstream signals of a CATV facility, which is an external transceiver, from the CATV transmission path.

The reception-only subscriber equipment 12 of the non-CATV subscriber dwelling unit 30 includes a directional coupler 13 for branching the downlink signal 20 from the transmission line 1 of the television listening facility, and a downlink signal 20.
Wall terminal 1 for outputting to a receiver including a television receiver 17
It consists of 1.

[0015] Two-way subscriber facilities 15 for CATV subscribers
Is a directional coupler 13 for branching the downlink signal 20 from the transmission line 1, a two-terminal type bidirectional serial unit 14, an up / down independent terminal type bidirectional home terminal 16 for controlling the CATV service, and the input terminal 11b. A directional coupler 13 that mixes the transmitted signal in the same direction as the direction in which the downstream signal transmitted from the outside is transmitted in the transmission line 1
Consists of The two-terminal type bidirectional serial unit 14 has a downstream output terminal 11a for outputting to a television receiver 17, which is a receiver of the subscriber's equipment, and an upstream for inputting a signal transmitted from a transmitter of the subscriber's equipment to a television common listening facility. It comprises an input terminal 11b.

In a dwelling unit 50 in which reception-only subscriber equipment and two-way subscriber equipment coexist, the one-way four-way distributor 103 distributes the branch output of the down signal 20 into four signals, one of which is distributed to the down output terminal 11a. Connect and other distributed signals
Connected to wall terminal 11.

A case where a downlink signal is received will be described. First, the downstream signal 20 of the CATV facility supplied from the common transmitting / receiving point 101 is transmitted to the transmission line 1 via the duplexer 102, and the necessary transmission level is amplified by the premises amplifier 105. When the signal is received by the non-CATV subscribing dwelling unit 30, the signal is branched from the transmission line 1 by the directional coupler 13 of the reception-only subscriber equipment 12 and output to the television receiver 17 through the wall surface terminal 11.

When the signal is received by the two-way subscriber facility 15 of the CATV subscriber dwelling unit 40, the two-way subscriber facility 15
Are branched from the transmission line 1 by the directional coupler 13 and output to the television receiver 17 through the downstream output terminal 11.

Next, the case of transmitting from the two-way subscriber equipment 15 of the CATV subscriber dwelling unit 40 will be described. The two-way subscriber equipment 15 is transmitted to a CATV facility via an up / down independent terminal type two-way home terminal 16. The upstream signal 10 transmitted from the home terminal does not match the frequency with the upstream frequency band used in the external destination CATV facility, and is transmitted using an available frequency in the downstream frequency band of the TV common listening facility. , Through the input terminal 11b, and mixed by the directional coupler 13 in the direction in which the down signal 20 is transmitted in the transmission line 1.

The transmitted upstream signal 10 is extracted at the end of the transmission line by an upstream signal converter 120 comprising a band-pass filter 121 and a frequency converter 122 and transmitted to the associated CATV facility. The frequency is converted into a frequency of 250
Sent to ATV facility.

A second embodiment will be described with reference to FIG. FIG.
Then, the upstream signal 10 is converted by the upstream signal converter 120 into
The frequency is converted to an available frequency in the frequency band of the downstream signal of the television listening facility, and transmitted to each subscriber facility via the center station 2 of the television listening facility.

Although not shown, the third embodiment differs from the second embodiment in that a signal from a satellite broadcast is received at a common reception point without using a common transmission / reception point and distributed to each dwelling unit.
In addition, the upstream signal 1 transmitted from the bidirectional subscriber equipment 15
The selection signal of the broadcast service, which is one of 0, is converted by the upstream signal converter 120 into a signal connected to a public line or a satellite line, and transmitted to a satellite broadcast control station through a common transmission point.

[0023]

The interactive television listening facility of the present invention transmits a signal transmitted from the subscriber equipment to an available channel of a downlink signal of the television listening facility, and transmits the signal from the subscriber equipment at the end of the television listening facility. The extracted signal is extracted, and the associated CA
By converting the signal into an upstream signal from a TV facility and connecting to a CATV facility, the conventional one-way transmission TV sharing facility can be made bidirectional at low cost.

Also, CATV mixed in a TV listening facility
Noise generated in the upstream frequency band used by facilities is CAT
The two-way CATV facility can be connected to the television common listening facility without being mixed into the V facility and without deteriorating the transmission quality of the uplink of the CATV facility.

Further, in a one-way television listening facility that is not connected to a CATV facility, the signal transmitted to the transmission line of the television listening facility is frequency-converted to another free frequency at the end of the transmission line, and then transmitted to the other end of the transmission line. Mixing in the down direction at the common transmission / reception point of the listening facility makes it possible to make the one-way TV shared listening facility inexpensive and interactive.

[0026]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an interactive television shared listening facility of an apartment house according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an interactive television shared listening facility of an apartment house according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional shared listening facility of an apartment house.

FIG. 4 is a configuration diagram showing a conventional interactive television shared listening facility of a condominium.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transmission line 2 Center station of TV common listening facility 3 System branch line 4 Branch wiring 10 Up signal 11 Wall terminal 11a Down signal output terminal 11b Up signal input terminal 12 Reception only subscriber equipment 13 Directional coupler 14 Both 2-terminal type Direct-serial unit 15 Two-way subscriber equipment 16 Up / down independent terminal-type two-way home terminal 17 TV receiver 20 Down signal 30, 60 Non-CATV subscribed dwelling unit 40, 70 CATV subscribed dwelling unit 50, 80 Two-way with reception-only subscriber equipment Dwelling unit with mixed subscriber equipment 90 Terminating resistor 101 Common transmission / reception point 102 Demultiplexer 103 One-way four distributor 104 One-way two distributor 105 One-way ridge amplifier 120 Up signal converter 121 Band-pass filter 122 Frequency converter 201 common receiving antenna 202 channel amplifier 250 CATV facility Outgoing upstream signal 301 Bidirectional 4-divider 302 Bidirectional 2-divider 303 Bidirectional ridge amplifier 304 Bidirectional directional coupler 305 High-pass filter 306 Bidirectional series unit with high-pass filter 307 Bidirectional home terminal 308 Bidirectional Series unit

Claims (4)

(57) [Claims] 1. A plurality of downlink signals including a television signal transmitted from a transmitter outside a television common listening facility are supplied through a common reception point and distributed to subscriber units of each dwelling unit. , A transmission line for distributing the received signal to each dwelling unit and a downlink signal for exclusive use in a TV co-listening facility that transmits an up signal from a subscriber's facility in each dwelling unit to an external receiver through a common transmission point Reception-only subscriber equipment, bi-directional subscriber equipment for receiving the downlink signal and transmitting the downlink signal to an external receiver, and an uplink signal converter, wherein the bi-directional subscriber equipment comprises: Transmit using a vacant frequency in the frequency band of the transmitted downstream signal, the upstream signal converter extracts a signal to be transmitted to an external receiver from the frequency band of the downstream signal, and converts it to an upstream signal, Send through a common sending point An interactive television sharing facility characterized by the following: 2. In a television listening facility wherein a television signal is distributed from a common antenna to a subscriber facility of each dwelling unit of an apartment house, the two-way subscriber facility of each dwelling unit includes:
A signal to be transmitted to a CATV facility is arranged in an empty frequency of a transmission frequency band of a television signal, and is transmitted in the same direction as a direction in which a television signal is transmitted. The conversion device extracts a signal to be transmitted in the upstream direction from all signals flowing through the television co-listening facility, converts the signal into an uplink frequency of a CATV facility to be transmitted, and transmits the signal to the CATV facility. Interactive TV shared listening facility. 3. A CAT connected to a transmission line of a CATV facility.
In a TV shared listening facility of an apartment house, which collectively receives a downlink signal transmitted from the V facility and distributes the signal to the subscriber facilities of each dwelling unit, the TV shared listening facility sends the downlink signal to each dwelling unit. Transmission line to be distributed, non-CATV subscriber equipment of dwelling units not subscribing to CATV, CATV subscriber equipment of dwelling units subscribing to CATV, and upstream signal converter for converting signals transmitted from CATV subscriber equipment to upstream signals of CATV facilities The non-CATV subscriber equipment comprises: a directional coupler for branching a downlink signal transmitted from a CATV facility from a transmission line of a television listening facility; and a downlink output terminal for outputting the downlink signal to a television receiver. The above CATV subscriber equipment outputs a directional coupler for branching a downlink signal transmitted from the CATV facility from a transmission line to a receiver of the subscriber equipment. A downstream output terminal, an upstream input terminal for inputting a signal transmitted from a transmitter of the subscriber's equipment, and a signal transmitted through the input terminal to determine the direction in which the downstream signal of the CATV facility is transmitted through the transmission line. The signal transmitted through the upstream input terminal is composed of a directional coupler that mixes signals in the same direction. The frequency of the signal does not match the upstream frequency band of the CATV facility, and the signal is transmitted using an empty frequency in the downstream frequency band. And, at the end of the transmission line, extracted by an upstream signal converter composed of a band-pass filter and a frequency converter, and converted into the frequency of the upstream signal of the associated CATV facility,
A two-way television shared listening facility, which is mixed in a transmission path of a CATV facility and transmitted in an upward direction. 4. The up-signal converter converts the extracted signal into an available frequency of a down-signal of the TV listening facility and transmits the signal to each dwelling unit via the center station of the TV listening facility. Item 2. An interactive television listening facility according to item 2.