JPH0113467Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuner adapter for satellite broadcast reception that can support different transmission frequencies for individual and communal listening systems during satellite broadcast reception.

Conventionally, there are four types of systems for receiving satellite broadcasting, as shown in FIGS. 1 to 4 a and b.
FIG. 1 shows a public reception (HE) U/V (AM) transmission system. This method is mainly used for medium to large public listening facilities, and converts the FM transmission method to the AM transmission method. In the case of distribution, all reception channels are demodulated and then remodulated and delivered to each home, where each home receives the signal using an existing receiver. In addition, Figure 2 shows the building public listening reception UHF
(FM) transmission method, which is used for public listening systems with a relatively small number of distribution terminals, such as building public listening systems. Signal transmission is performed using a converter (ODU) that converts the 12GHz band signal received by antenna 1.
2 converts the signal into a frequency band of 1.0 to 1.3 GHz, and the signal is further converted to a frequency band of 470 to 770 MHz by another S-U converter 3, and transmits it within a building, for example, and distributes it to each house. Further, at each terminal section, the frequency band is again converted to 1.0 to 1.3 GHz by the U-S converter 4. Then, tuner (IDU) 5 selects the desired channel and supplies it to the receiver.
FM transmission. Next, Fig. 3 is almost the same as the building common reception UHF (FM) transmission system shown in Fig. 2, but the difference is that each unit uses tuner (IDU) 5.
When supplying signals to the network, it is supplied using UHF transmission in the range of 470 to 770MHz. Further, FIGS. 4a and 4b show individual reception systems, respectively; FIG. 4a shows television reception, and FIG. 4b shows audio reception. This individual reception method is the most commonly used, and is 1.0 to 1.3G from antenna 1 and converter (ODU) 2.
The Hz FM signal is supplied to the tuner 5 as is.

The basis of each of these methods is individual reception, and the tuner unit is basically 1.0
Designed for input in the ~1.3GHz frequency band.

However, if a user moves, for example, from a house of the type shown in FIG. 2 to an apartment house of the type shown in FIG. 3, the tuner unit he/she already has will become unusable because the frequency band used will be different. Furthermore, even if a tuner unit is purchased exclusively for communal listening, it is impossible to switch to individual listening in the future.

The present invention was developed in view of the above circumstances, and its purpose is to provide a tuner adapter for broadcast satellite reception that enables the use of the same tuner unit in both individual reception and communal reception frequency bands. be.

The present invention consists of an input terminal into which the signals of the individual reception frequency band and the communal reception frequency band are respectively input, a duplexer that demultiplexes the signals of both frequency bands input to this input terminal, and a an amplifier that amplifies the output signal in the individual reception frequency band; a converter that converts the frequency of the signal in the communal reception frequency band output from the duplexer to the individual reception frequency band; and a synthesizer for synthesizing each output signal of the amplifier, and by supplying the output of the synthesizer to the tuner unit, the tuner unit can be connected to an individual receiving frequency band (1.0 to 1.3 GHz).
and the communal reception frequency band (470-770MHz).

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 5, 11 is an input terminal,
This input terminal 11 is connected to each input terminal of a high-pass filter 12 and a low-pass filter 13. The output terminal of the high-pass filter 12 is connected to one input terminal of a synthesizer 15 via an amplifier 14. Further, the output end of the low-pass filter 13 is connected to the other input end of the synthesizer 15 via a converter 16. 17
is an output terminal of the synthesizer 15, and is connected to a tuner unit (not shown).

In tuner adapters with this configuration,
When a signal of 1.0 to 1.3 GHz for individual reception or 470 to 770 MHz for communal reception is input from input terminal 11, this signal is demultiplexed to either high-pass filter 12 or low-pass filter 13. be done. That is,
In the case of a signal of 1.0 to 1.3 GHz, the converter 16 is turned off, so the input signal passes through the high-pass filter 12, the amplifier 14 and the combiner 15, and is sent to the tuner unit connected to the output terminal 17. Supplied. On the other hand, when a signal of 470 to 770 MHz is input, the converter 16 is turned on. That is,
The oscillation frequency of the local oscillation source 16a in the converter 16 is set to 1770MHz, and this signal and the above 470~
The mixer section 16b mixes the 770 MHz signal and converts the frequency into a 1.0 to 1.3 GHz signal. This signal is supplied to the tuner unit via the combiner 15. Note that the amplifier 14 has a power of 1.0 to 1.3G.
Hz direct input signal and converter 16
The interference wave from the local oscillation source 16a is transmitted to the combiner 15,
Furthermore, this prevents the signal from passing through the high-pass filter 12 and leaking to the input terminal 11 side.

As described above, according to the present invention, both the joint reception tuner unit dedicated to CATV and the individual tuner unit dedicated to direct reception can be applied, so even if the reception method is changed due to moving etc., it can be used easily and it is easy to replace. Since it is not necessary, it is extremely economical.

[Brief explanation of the drawing]

Figures 1 to 4 are block diagrams showing typical systems in the conventional satellite broadcast reception mode, and Figure 5
The figure is a circuit configuration diagram of a tuner adapter for broadcasting satellite reception according to an embodiment of the present invention. 11...Input terminal, 12...High-pass filter, 1
3...Low pass filter, 14...Amplifier, 15...
Synthesizer, 16... converter, 17... output terminal.

Claims (1)

[Scope of utility model registration request] An input terminal into which signals of the individual reception frequency band and the communal reception frequency band are respectively input, a duplexer that demultiplexes the signals of both frequency bands input to this input terminal, and a an amplifier that amplifies a signal in the individual reception frequency band; a converter that converts the frequency of the signal in the communal reception frequency band output from the duplexer to the individual reception frequency band; and each of the converter and the amplifier. A tuner adapter for broadcasting satellite reception, comprising a synthesizer for synthesizing output signals.