TV signal distributor device, receiver device, transmitting system and method
A TV signal and transmission system technology, which is applied in the direction of broadcast transmission system, TV system components, power distribution switchgear, etc., can solve the problems of high cost
Inactive Publication Date: 2005-12-07
SONY CORP
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- Claims
- Application Information
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Problems solved by technology
However, the proposal required the complex work of providing new cables in the existing collective housing, which was quite expensive
Method used
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[0029] Hereinafter, the preferred embodiment of the present invention will be described with reference to the drawings.
[0030] The present invention is particularly suitable for implementing a television signal transmission system in which the signal received via a common receiving antenna is transmitted to each household via a cable, such as a small-scale television signal transmission system provided in a collective house such as an apartment building.
[0031] According to the present invention, the CS broadcast signal from each transponder received through the shared receiving antenna undergoes modulation format conversion so that the signal can be accommodated in a narrow bandwidth. The signal contained in the narrow bandwidth is then frequency shifted to a free channel in the VHF band or UHF band. This eliminates the need to provide additional frequency bands for CS broadcast signals; therefore, even if the CS broadcast signal is provided by two or more satellites, it can ...
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In a television signal transmission system, CS broadcasting signals received via a master antenna are converted into intermediate frequency signals in an LNB (Low Noise Block Down Converter). The CS intermediate frequency signals then undergo conversion of the modulation format, for example, from QPSK into 64-QAM, so that CS broadcasting signals from each transponder, having a bandwidth of, for example, 27 MHz, are accommodated in a narrower bandwidth, for example, 6 MHz, which is equivalent to one channel of terrestrial broadcasting services. Then, the signals accommodated in the narrower bandwidth is frequency-shifted into a vacant frequency band in the VHF band or the UHF band. Accordingly, the CS signals accommodated in the narrower band and frequency-shifted into the vacant band are multiplexed with terrestrial broadcasting signals in the VHF and UHF bands and BS intermediate frequency signals so that all these signals are delivered to each household via a single cable.
Description
Technical field [0001] The invention relates to a television signal distributor device, a receiver device, a television signal transmission system and method. More specifically, the present invention relates to a television signal distributor device, a receiver device, a television signal transmission system, and a method particularly suitable for realizing a small-scale television signal distribution network in which the distribution network is provided on the roof of collective housing such as apartment buildings. The TV signal received by one of the shared receiving antennas is transmitted to each family through the cable. Background technique [0002] In a collective house such as an apartment building, a television signal transmission system is conventionally provided in which a television signal received through a common receiving antenna on the roof is transmitted to each household via a cable. In the VHF band and UHF band terrestrial broadcasting services, broadcasting st...
Claims
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IPC IPC(8): H04N5/40H04H20/26H04H20/74H04H20/76H04H40/18H04N5/00H04N5/44H04N5/445H04N7/10H04N7/20H04N21/2365H04N21/647
CPCH04H20/26H04H20/76H04H20/74H04N21/4622H04N7/20H04N21/4382H04N5/4401H04N21/6143H04H40/90H04N7/106H04H40/18H04N5/40H04N21/6118H04N21/4345H04N5/4446H04N21/426H04N7/10
Inventor 大石克巳福泽惠司猪濑谦司
Owner SONY CORP