JPH0411486A - Satellite receiving system - Google Patents

Abstract

PURPOSE:To reduce parts and to add a function by converting the respective demodulation outputs of plural decoders into high frequency signals with different ground broadcast wave bands respectively, mix-outputting them and superimposing video or sound messages from an external part. CONSTITUTION:Plural decoders 14, to which an intermediate frequency signals are supplied from a distributor 13, supplies the outputs of them to a PF converter 15. The converter 15 converts them into high frequency signals different from a groung broadcast wave and outputs a mixer 16 to output to an external part. These functions are housed in a basket body 17. Besides, a message input device 25 to superimpose a video message and a sound message is connected to a changeover switch 26. The video message and the sound message are transmitted to the converter 15 with substituting for a station selection demodulating output by the control of the switch 26. Thus, a function to transmit the message profitable in an ordinary level can be added to the common system of a small scale.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a satellite receiving system that is capable of transmitting a private message superimposed on the public listening output of a satellite channel.

[Prior art] Satellite broadcasting and satellite communications carried out using broadcasting satellites or communication satellites above the equator are completely different from terrestrial broadcasting in terms of signal transmission method and occupied radio wave band. An individual reception system or a joint reception system is required.The individual reception system converts the 12GHz band satellite radio waves captured by a satellite reception antenna into an IGHz band intermediate frequency signal using an outdoor converter and transmits them to the indoor satellite. The baseband signal is transmitted to the reception tuner and demodulated by the satellite reception tuner, and is basically sent to the television receiver via the video cable and audio cable, and the video input terminal or audio input terminal When viewing on a television receiver that does not have a VH
Supplies high frequency signals in the F 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 bands and transmitted as FM signals, but in the case of small-scale community reception facilities, IGHz
It is often distributed using band intermediate frequency signals.

On the other hand, the AM transmission method demodulates the 12 GHz band FM signal into a baseband signal, and then remodulates it into a high-frequency signal in the UHF broadcast wave band, VHF broadcast wave band, or VHF mid-band and transmits it, similar to terrestrial broadcasting. This is a method to do so. In the case of this AM transmission system, the original quality of satellite broadcasting or satellite communication is somewhat degraded due to the conversion of FM signals to AM signals, but it has the advantage that existing communal reception facilities can be used as is.

The satellite reception system 1 shown in Fig. 4 is intended for communal listening at home using the AM transmission system, and is connected indoors via a coaxial cable to a converter 3 attached to an antenna 2 fixed on an outdoor balcony or the like. After converting multiple satellite channels into RF multiplied signals of different terrestrial broadcast wave bands in the communal listening device 4, the cable connects the U/V mixer 5 and the TV antenna terminal in each room. The signal is supplied to the mixing amplifier 6. As shown in FIG. 5, the communal listening device 4 specifies a distributor 7 that distributes the output intermediate frequency signal of the converter 3 and the intermediate frequency signals distributed by this distributor 7 so that no overlap occurs. A plurality of satellite reception tuners 8 that select and demodulate only specific satellite channels, and a plurality of RF converters 9 that convert each demodulated output of the plurality of satellite reception tuners 8 into RF multiplication signals of different UHF broadcast wave bands. and these multiple RF
A mixer 10 that mixes and outputs the converted outputs of the converter 9
Consists of etc.

[Problem to be Solved by the Invention] The conventional satellite reception system 1 described above has the same number of channels as the number of channels in the communal listening device 4 in order to be able to freely view a plurality of satellite channels in any room. A plurality of satellite reception tuners 8 are provided, and 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. For this reason, multiple satellite reception tuners 8 manufactured with individual reception in mind.
Not only do the power supply circuits of each set become redundant, but using a , which is very uneconomical for the user, and since the co-listening device 4 has the same number of satellite reception tuners 8 and RF converters 9 in separate housings, the overall configuration of the device becomes complicated, and The installation location was also severely restricted, making it unsuitable for small-scale public listening systems such as those used in homes.

Furthermore, since the conventional satellite reception system 1 described above can send the output of the communal listening device 4 to each room, it has a function similar to that of a home communication system, although it is one-way, and has been widely introduced in recent years. This can be said to contain the seeds of development into more advanced composite technologies, such as collaboration with home automation systems, which have become popular. However, the conventional satellite reception system 1 has been limited to only one field of use, such as co-listening to satellite channels, so although it has various potential applications in small-scale systems such as home co-listening systems, it is not practical. The reality is that they have not yet reached the point of producing useful added value.

[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. a converter, a mixer that mixes and outputs the converted outputs of the plurality of RF converters, and a video message or an audio message from the outside is superimposed on the demodulated output sent from the plurality of decoders to each corresponding RF converter. It is characterized by comprising a message input means.

[Operation] This invention converts the demodulated outputs of a plurality of decoders into high frequency signals of different terrestrial broadcast wave bands, mixes and outputs these converted outputs, and also allows any demodulated output to receive a video message from the outside. Alternatively, by making it possible to superimpose voice messages, a satellite reception system suitable for small-scale communal listening and message transmission is provided at a low price.

[Embodiments] Hereinafter, embodiments 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 circuit diagram of the message input device shown in FIG. 2.

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 that are supplied with the medium-opening wave signal from the distributor 13, and a plurality of RF converters 1 that convert the respective demodulated outputs of the plurality of decoders 14 into high-frequency signals of different terrestrial broadcast wave bands.
5, a mixer 16 for mixing the converted outputs of these plurality of RF converters 15, and outputting the mixture to the outside, etc., 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.

The public listening satellite receiver 12 accommodates a plurality of decoders 14 and the corresponding RF converters 15 in a single housing 17, so that the channel selection demodulation section 18, the video signal processing section 19, or the 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.

Note that the RF converter 15 has a plurality of conversion modes predetermined from satellite channels to terrestrial broadcasting channels, but here, the conversion mode can be changed by operating the output channel switching circuit 22 that communicates with all the RF converters 15. In addition to the conversion modes prepared in advance, for example, B
515 channel becomes UHF13 channel, and B5
Channel 11 becomes UHF15 channel, and BS
For the 9 channels, a conversion mode such as UHF 17 channels can be selected.

In addition, in the embodiment, the baseband output selection circuit 23 of Section 1 is connected to the plurality of decoders 4 in order to selectively output any demodulated output of the respective demodulated outputs to the outside, By sending video and audio signals output in the baseband to a television receiver installed near the communal satellite receiver 12 via a dedicated connection cable, satellite broadcasting or satellite communications can be improved. You can enjoy high-quality video and audio.

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.

By the way, 25 is a message input device that superimposes a video message and an audio message from the outside onto the demodulated outputs sent from the plurality of decoders 14 to the corresponding RF converters 15. This message input device 15 is
As shown in FIG. 3, a keyboard 27 and a microphone 28 are respectively connected to the changeover switches 26 provided on the video signal line and the audio signal line connecting the plurality of decoders 14 and the corresponding RF converters 15. By controlling the changeover switch 26 by the control circuit 29, a video message and an audio message can be sent to the RF converter 15 instead of the channel selection demodulation output. That is, the changeover switch 26 and the message input device 25 constitute message input means.

Here, a message inputted by operating the keyboard 27 is first converted into a character signal by a character generation circuit (not shown) within the keyboard 27, and then supplied to the changeover switch 26. At this time, the switching control circuit 29 determines the message superimposition position on the screen based on the horizontal and vertical synchronization signals separated and extracted from the channel selection demodulation output of the decoder 14, and determines the message superimposition position on the screen when the screen scan approaches the message superimposition position. when the switch 26 is pressed to the keyboard 2
Switch to the 7 side. Therefore, messages entered by operating the keyboard 27 are sent to all RF converters 15 via the changeover switch 26, and are sent from the satellite to the television receivers in all rooms where the satellite channel is being viewed. The screen is displayed using part of the image that is coming.

On the other hand, when a voice message is input using the microphone 28, the input voice signal is supplied as is to the changeover switch 26.

At this time, the switching system m circuit 29 switches the changeover switch 26 to the microphone 28 side each time the voice message is being input.

Therefore, the voice message sent from the microphone 28 can be inserted into a part of the voice signal of the satellite channel selected and demodulated by the decoder 14 at any time.

As described above, according to the satellite reception system 11, it is possible to insert video messages and audio messages into all satellite channels by using the keyboard 27 or the microphone 28 attached to the message input device 25. Messages can be transmitted to the television receiver, which is the receiving terminal in each room, using the public listening system, and can be used as a home broadcast system, for example, to notify everyone that meal preparation is complete, or to send a message to the next room. Useful one-way communications, such as relaying incoming telephone calls or alerting viewers of satellite channels that important or interesting programs are being broadcast on terrestrial channels. is possible.

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. Yes, and since the message input means can be used to interrupt all satellite channels with video and audio messages, it is possible, for example, to transmit a message to a remote room using a home listening system, and to receive the message. It is possible to send the same message all at once to terminals by broadcast communication, or to relay telephone calls, and even to inform the satellite channel that important or interesting programs are being broadcast on the terrestrial broadcasting channel. It is possible to communicate to the people watching,
This brings about excellent effects, such as the ability to add a function to transmit messages that are useful on a daily basis, especially to small-scale public listening systems.

[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.
3 is a circuit configuration diagram of the message input device shown in FIG. 2, 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, 25. ,,Message input device, 26°1. Selector switch.

Claims (1)

[Claims] 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, a plurality of decoders to which the intermediate frequency signals output from this converter are distributed, installed in the same housing, and this receiver. a plurality of RF converters that convert the respective demodulated outputs of the plurality of decoders built into the machine into high frequency signals of different terrestrial broadcast wave bands; a mixer that mixes and outputs the converted outputs of the plurality of RF converters; A satellite reception system comprising message input means for superimposing an external video message or audio message on the demodulated outputs sent from a plurality of decoders to corresponding RF converters.