Telecommunications – Interference signal transmission
Patent
1989-07-18
1992-03-03
Kuntz, Curtis
Telecommunications
Interference signal transmission
455189, 455315, H04N 100
Patent
active
050939220
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to receiving apparatus, such as CATV converters, televison tuners, and the like, for receiving satellite broadcasting programs transmitted through cables.
BACKGROUND ART
Satellite broadcasting, CATV, and the like, have been popularized with the rise of new media in recent years. In order to receive a satellite broadcast, it is popular to use a system in which a parabolic antenna is arranged in every home. A received signal, for example, of 4 GHz band is converted by a frequency converter called a "BS converter" into an intermediate-frequency signal (BS-IF signal) in a band of from 1.0 GHz to 1.3 GHz, and the intermediate-frequency signal is led indoors so as to be received by a BS tuner. Transmission of satellite broadcasting FM signals by using a superhigh band or a UHF band among television bands in the rate of several channels per BS channel has been put into practical use with the development of CATV. In order to achieve reception in this case, it is popular to use a receiving system in which a cable signal is converted into a BS-IF signal by using an up-converter and the output of the up-converter is fed to the BS tuner.
Such a conventional receiving apparatus as described above will be described hereunder with reference to FIG. 1.
FIG. 1 shows a conventional system for receiving a satellite broadcast through a cable. In FIG. 1, the reference numeral 1 designates CATV equipment, 21 a CATV converter for converting the frequency of a CATV signal outputted from the CATV equipment 1, 3 a TV set, 4 a BS up-converter for converting the frequency of the CATV signal outputted from the CATV equipment 1, and 5 a BS tuner for feeding the output signal of the BS up-converter to the television set 3.
In the receiving apparatus having such a configuration as described above, the operation of the apparatus will be described hereunder. In FIG. 1, a general 6 MHz-band signal among the cable signals transmitted from the CATV equipment 1 is frequency-converted by the CATV converter 21 into a predetermined RF channel signal which is then fed to the TV set 3. On the other hand, a BS-IF signal converted in the CATV equipment 1 into a superhigh band or a UHF band is frequency-converted by the up-converter 4 into a band of from 1.0 GHz to 1.3 GHz which is then fed to the BS tuner 5. In the BS tuner 5, the signal is converted into a 13th UHF channel signal or outputted as an audio/video signal so as to be inputted into the TV set 3. In the case of an all-band tuner type receiver, the converter 21 can be omitted.
In order to receive the BS-IF signal converted into a superhigh band or a UHF band, however, it is necessary to employ such an additionally provided up-converter 4 as described above, and there has been a problem in that cost increases largely.
It is therefore an object of the present invention to provide a receiving apparatus having no necessity of employing such an additionally provided up-converter so that costs can be greatly reduced.
DISCLOSURE OF THE INVENTION
In order to attain the foregoing object, the receiving apparatus according to the present invention uses a double-super type converter or tuner having a first frequency-conversion portion and a second frequency-conversion portion. A conversion output terminal for feeding a signal to a BS tuner is provided at the output side of the first frequency-conversion portion. A BS signal converted into a UHF band or a superhigh band is fed to the first frequency-conversion portion through a cable so as to be subject to frequency conversion. Then, a BS-IF signal is taken out from the conversion output terminal and fed to the BS tuner without using such an additionally provided up-converter.
In this configuration, an up-conversion function can be established in the inside of the converter or tuner, and there is no necessity of additional provision of such an up-converter. Accordingly, simplification in construction can be attained, so that cost can be reduced largely.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a
REFERENCES:
patent: 4079415 (1978-03-01), Will
patent: 4418427 (1983-11-01), Muterspaugh
patent: 4633513 (1986-12-01), Taney
CATV of Satellite Broadcasting Age, CATV Technical Research Meeting, GYOSEI, pp. 50-52, Jul. 10, 1987--English translation of relevant portions.
Kubo Kazuhiko
Ueda Minoru
Usui Akira
Kuntz Curtis
Matsushita Electric - Industrial Co., Ltd.
Urban Edward
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