JPH0411489A - Satellite receiving system - Google Patents

Abstract

PURPOSE:To simplify channel setting by providing plural decoders to which intermediate frequency signal are distributed within a same case body, converting respective demodulating outputs into high frequency signals with different ground broadcast bands respectively and after that, mix-outputting them. CONSTITUTION:Plural decoders 14, to which intermediate frequency signals are supplied from a distributor 13, demodulate them and output them to a RF converter 15. The converter 15 converts them into high frequency signals with difference ground broadcast bands respectively, mixes through a mixer 16 and outputs to an external part. These functions are housed in a same case body 17. A station selecting demodulator 18, a video signal processing part 19 and a sound PCM signal processing part 20 are built in the decoder 14. Station-selecting and demodulation are executed only on an individual assigned and specified satellite channel so as not to be duplicated in advance and video and sound signals are outputted by a base band from the processing parts 19 and 20. Thus, also an operation when resetting is executed adjusting to a vacant channel can be satisfied with the one button operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a satellite reception system that converts radio waves coming from a satellite into high-frequency signals in a terrestrial broadcast wave band and provides the signal for public listening.

[Prior Art] Satellite broadcasting and commercial communications carried out using broadcasting satellites or communication satellites above the equator are completely different from terrestrial broadcasting in terms of signal transmission methods and occupied radio wave bands. An individual reception system or a joint reception system is required. The individual reception system converts the 12 GHz band satellite broadcast radio waves captured by the satellite reception antenna into a 1.0 Hz band intermediate frequency signal using an outdoor converter, transmits it to the indoor satellite reception tuner, and then transmits the signal to the satellite reception tuner. Basically, the baseband signal demodulated by the receiving tuner is sent to the television receiver via the video cable and audio cable, and the television receiver does not have a video input terminal or audio input terminal. When viewing the video, a re-modulator is used to supply a high frequency signal in the VHF or UHF broadcast wave band.

On the other hand, community reception systems are broadly classified into two types: FM transmission system and AM transmission system. FM transmission method is 12GHz
It is a method that converts the FM signal in the band into a signal in the frequency band suitable for the communal reception facility and distributes it to each home via cable. , IGHz band intermediate frequency signals may be further converted to UHF broadcast wave band and transmitted as FM signals, but in the case of small-scale community reception facilities, 1GH7
, band intermediate frequency signals are often distributed.

On the other hand, the AM transmission method demodulates the 12 GHz band FM signal into a baseband signal, and then converts it into a high-frequency signal in the UHF broadcast wave band, V) IF broadcast wave band, or V) (F midband), similar to terrestrial broadcasting. This is a method of re-modulating and transmitting.In the case of this AM transmission method, the original quality of satellite broadcasting or satellite communication is slightly degraded due to the conversion of FM signals to AM signals, but existing communal reception facilities can be used as is. There are advantages.

The satellite reception system 1 shown in FIG. 4 is intended for communal listening at home using the AM transmission system, and connects a converter 3 attached to a satellite reception antenna 2 fixed to an outdoor balcony or the like using a coaxial cable. After connecting to the indoor public listening device 4 through the public listening device 4 and converting the multiple satellite channels into RF signals of different terrestrial broadcast wave bands in the public listening device 4, the U/V mixer 5
The signal is supplied to a mixing amplifier 6 in the middle of the cable connecting the TV antenna terminals in each room. Community listening device 4
As shown in FIG. 5, there is a distributor 7 that distributes the output intermediate frequency signal of the converter 3, and the intermediate frequency signal distributed by the distributor 7 is distributed to a specific satellite channel specified so that no overlap occurs. a plurality of satellite reception tuners 8 that perform channel selection demodulation only for the plurality of satellite reception tuners 8; a plurality of RF converters 9 that convert each demodulated output of the plurality of satellite reception tuners 8 into RF multiplied signals in different UHF broadcast wave bands; The RF converter 9 includes a mixer 10 that mixes and outputs the converted outputs of the RF converter 9.

[Problems to be Solved by the Invention] The conventional satellite reception system 1 described above uses a communal listening device to enable users to freely view all channels of satellite broadcasting in which multiple channels are broadcast no matter which room they are in. 4
Multiple satellite reception tuners 8 with the same number of channels
Therefore, when the number of satellite channels increases in the near future, it will be necessary to provide a plurality of satellite reception tuners 8 for each household. The satellite reception tuner 8 consists of a channel selection demodulation section, a video signal processing section, an audio PCM signal processing section, etc., but since it has the function of supplying a DC 15V voltage as an operating power source to the converter 3,
The built-in power supply circuit accounts for a significant proportion of the overall manufacturing cost. Therefore, using multiple satellite reception tuners 8 that are manufactured with the assumption of individual reception is
The power supply circuits of each set are duplicated, and the user has to be prepared for considerable waste, including the case design, which clearly provides cost benefits by consolidating the power supply circuits, which is very inconvenient for the user. In addition, since the shared listening device 4 has the same number of satellite reception tuners 8 and the same number of RF converters 9 in separate housings, the overall configuration of the device becomes complicated and the installation location is also limited. The problem was that it was unsuitable for small-scale public listening systems, such as those used in homes.

Further, the conventional satellite reception system 1 has an RF converter 9
When re-modulating and outputting a satellite channel using the tJ HF broadcast wave band, a specific UHF empty channel must be set for each RF converter 9, and the set channels must not overlap. For most users, who lack specialized knowledge of terrestrial broadcast band occupancy, setting up channels is a pain, and especially when moving, it becomes necessary to reset the settings to match the available local channels at the new location. At times,
This has had problems, such as requiring a considerable amount of work on the user to change the channel of the re-modulated output.

[Means for Solving the Problems] The present invention solves the above problems, and includes a converter that converts radio waves coming from a satellite captured by a satellite receiving antenna into an intermediate frequency signal, and an output intermediate signal of this converter. A receiver that has multiple decoders distributing frequency signals in the same housing, and multiple RFs that convert each demodulated output of the multiple decoders built into this receiver into high frequency signals in different terrestrial broadcast wave bands. It is characterized by comprising a converter and a mixer that mixes and outputs the converted outputs of the plurality of RF converters.

[Operation] This invention uses a receiver in which a plurality of decoders to which output intermediate frequency signals of a converter are distributed are provided in the same housing,
The demodulated outputs of the multiple decoders built into this receiver are
By converting the high-frequency signals into different terrestrial broadcast wave bands and then outputting them together, a satellite reception system suitable for small-scale public listening is provided at a low price.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a system configuration diagram showing an embodiment of a home public listening system to which the satellite reception system of the present invention is applied, and FIG. 2 is a circuit configuration diagram of the public listening satellite receiver shown in FIG. , FIG. 3 is a diagram showing the manner of conversion from a satellite channel to a terrestrial broadcasting channel.

The satellite reception system 11 shown in FIG. 1 uses a public listening satellite receiver 12 that converts a plurality of satellite channels into high frequency signals in an appropriate terrestrial broadcast wave band and outputs them for public listening at home. The communal satellite receiver 12 has been newly developed for communal reception using an AM transmission system, and as shown in FIG. , a plurality of decoders 14 supplied with intermediate frequency signals from the distributor 13, and a plurality of RF converters 15 that convert each demodulated output of the plurality of decoders 14 into high frequency signals in different terrestrial broadcast wave bands.
and a mixer 16 that mixes the conversion outputs of the plurality of RF converters 15 and outputs the mixture to the outside, which are housed in the same housing 17. The decoder 14 includes a channel selection demodulation section 18
It has a built-in video signal processing section 19 and an audio PCM signal processing section 20, and it selects and demodulates only specific satellite channels that are individually specified so as not to overlap in advance. 20 outputs a video signal and an audio signal in baseband, respectively.

By accommodating a plurality of decoders 14 and corresponding RF converters 15 in a single housing 17, the communal satellite receiver 12 has a channel selection demodulation section 18, a video signal processing section]9 or an audio P.
Although the main parts essential for each decoder 14, such as the CM signal processing section 20, cannot be made common, the power supply circuit 21 can be made common, and the power supply circuit required by the conventional satellite reception tuner 8 alone can be slightly reduced. This can be achieved by increasing the power consumption, so the benefits of reducing manufacturing costs through consolidation are extremely large. Furthermore, the cost reduction effect by sharing the housing 17 is significant, and it can be said that it is suitable for a small-scale public listening system such as a home public listening system.

By the way, the RF converter 15 has a plurality of conversion modes determined in advance from satellite channels to terrestrial broadcasting channels, and the output channel switching circuit 22 connected to all the RF converters 15 allows the conversion mode to be arbitrarily selected. It has become. In the case of the embodiment, by operating the output channel switching circuit 22,
The configuration is such that the correspondence between the satellite channel and the UHF broadcast channel to be converted can be switched in three ways according to the conversion mode illustrated in FIG.

That is, when the output channel switching circuit 22 selects conversion mode No. 1, for example, the conversion modes such as BS 1.5 channel becomes UHF 13 channel, B511 channel becomes UHF 15 channel, and BS 9 channel becomes UHF 17 channel are selected. be done.

Therefore, by considering the occupied bands of terrestrial broadcast waves, which differ from region to region, and preparing several types of conversion modes in advance on the manufacturer's side, most users who lack specialized knowledge of the occupied status of terrestrial broadcast waves can be easily , frees you from troublesome channel setting operations, and also allows you to reset the settings to match the available local channels when you move.
It can be simplified to the point where you only need to operate a button.

In addition, in the embodiment, a baseband output selection circuit 23 (or a plurality of baseband output selection circuits) for selectively externally outputting an arbitrary demodulation output of the respective demodulation outputs to the plurality of decoders 14
satellite broadcasting by sending video and audio signals output in baseband to a television receiver installed near the public satellite receiver 12 via a dedicated connection cable. Alternatively, you can enjoy the high-quality video and audio originally provided by satellite communications.

Furthermore, in the embodiment, a decoder 14 with a scramble output terminal is provided so as to be able to handle scrambled satellite communications sent from communication satellites, etc.
This allows a dedicated descrambler 24 to be connected to. Therefore, scrambled satellite communications can be viewed normally no matter where you are in the room.

In the above embodiments, the satellite to be received is not limited to the broadcasting satellite (BS), but may be another satellite such as a communication satellite (C8).

[Effects of the Invention] As explained above, the present invention provides a receiver in which a plurality of decoders to which output intermediate frequency signals of a converter are distributed are provided in the same housing, and a receiver is provided with a plurality of decoders to which output intermediate frequency signals of a converter are distributed. Because each demodulated output is converted to a high frequency signal of a different terrestrial broadcast wave band and then mixed and output,
By accommodating multiple decoders in a single housing, it is possible to reduce parts by sharing parts other than the main parts of the decoder, such as the channel selection demodulation section, video signal processing section, or audio PCM signal processing section. In addition, it is possible to enjoy the cost reduction benefits of consolidating the DC power supply and housing for the converter attached to the satellite receiving antenna, making it particularly suitable for small-scale public listening systems such as home public listening systems. It has some excellent effects.

Furthermore, by providing a common power supply circuit for multiple decoders in the receiver, this invention differs from conventional systems in which power supply circuits are mounted on individual satellite reception tuners.
It is possible to reduce the manufacturing cost by sharing the power supply circuit, and so on.

In addition, the present invention provides a communal satellite receiver that converts a plurality of satellite channels into high-frequency signals in the terrestrial broadcast wave band and outputs the signals by providing both a converter and a mixer in the same housing as a decoder. It is also possible to commercialize a compact receiver that is an all-in-one unit, providing an affordable in-home communal listening system, especially for users who want to receive their desired satellite channels individually in multiple rooms. It has the following effects:

In addition, the present invention provides a method for broadcasting different terrestrial broadcasts depending on the region by using an RF converter in which a plurality of conversion modes from a satellite channel to a terrestrial broadcasting channel are predetermined, and the conversion mode can be arbitrarily selected by an output switching circuit. If the manufacturer prepares several types of conversion modes in advance, taking into consideration the occupied wave band, most users who lack specialized knowledge of the terrestrial broadcast wave band occupation status can be freed from the troublesome channel setting operations. is possible,
In addition, when you move, the operation of resetting to match the available local channels at the new location can be simplified to the point where you only need to press a button.

In addition, the present invention enables satellite broadcasting or satellite communication to be performed by connecting an output selection circuit to a plurality of decoders in a receiver for selectively outputting any one of the respective demodulated outputs to the outside. It is possible to freely select and view high-quality broadcasts or communications with high picture quality and high sound quality.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram showing an embodiment of a home public listening system to which the satellite reception system of the present invention is applied;
The figure shows a circuit configuration diagram of the communal satellite receiver shown in Figure 1.
FIG. 3 is a diagram showing a conversion mode from a satellite channel to a terrestrial broadcasting channel, FIG. 4 is a system configuration diagram showing an example of a home public listening system to which a conventional satellite reception system is applied, and FIG. 5 is a circuit configuration diagram of the communal listening device shown in FIG. 4. FIG. 11., Satellite reception system, 12. ,,community satellite receiver,13. ,,distributor,14. ,,decoder,15.
,,RF converter, 16. ,. mixer.

Claims (5)

[Claims] (1) A receiver that includes a converter that converts radio waves coming from a satellite captured by a satellite receiving antenna into an intermediate frequency signal, and multiple decoders to which the output intermediate frequency signal of this converter is distributed in the same housing. , a plurality of RF converters that convert the demodulated outputs of the plurality of decoders built into the receiver into high-frequency signals in different terrestrial broadcast wave bands, and a mixer that mixes and outputs the converted outputs of the plurality of RF converters. A satellite reception system comprising: (2) The satellite reception system according to claim 1, wherein the plurality of decoders in the receiver have a common power supply circuit. (3) The satellite reception system according to claim 1, wherein the RF converter and mixer are both provided within the housing. (4) In the converter, a plurality of conversion modes from a satellite channel to a terrestrial broadcasting channel are predetermined, and the conversion mode is arbitrarily selected by the output channel switching circuit. satellite reception system. (5) A baseband output selection circuit is connected to the plurality of decoders in the receiver for selectively outputting any one of the respective demodulated outputs to the outside. The satellite reception system described in 1.