Novel integrated bidirectional tuner

Abstract

The invention provides a novel integrated bidirectional tuner which comprises a tuner input port, a variable frequency tuning circuit, a filter circuit, an amplification circuit and a demodulation circuit which are connected in the way that the output end of the variable frequency tuning circuit is connected with the input end of the filter circuit, the output end of which is connected with the input end of the amplification circuit; and the output end of the amplification circuit is connected with the input end of the demodulation circuit. The novel integrated bidirectional tuner is characterized in that an adjustable multiplexer also is connected between the variable frequency tuning circuit and the tuner input port. The adjustable multiplexer is embedded into a tuner which can not only separate data signals and cable television signals, but also function as a band-pass filter; therefore, compared with the original method that the adjustable multiplexer is arranged outside the tuner, elements, such as cable components or an adapter and a band-pass filter, etc., are reduced, thus not only saving cost, but also reducing extra insertion loss caused by the adding of the cable components or introduced by the adapter.

Description

technical field [0001] The invention relates to a cable TV tuner, in particular to a novel integrated two-way tuner. Background technique [0002] The CATV network mainly adopts the fiber optic cable and coaxial cable hybrid (HFC) mode, the optical fiber completes the signal transmission of the CATV trunk line, and the coaxial cable completes the signal transmission of the trunk line and the distribution network. Relying on the huge coaxial cable resources of the HFC cable TV system and using the coaxial distribution network that has penetrated into every family, attempts to build a traditional HFC cable TV network into a broadband comprehensive information network integrating voice, video and data have always been unsuccessful. continue. The early CMTS (Cable Modem Termination System) system, the current BIOC (Broadcasting and Interactivity Over Cable) system, EOC (Ethernet Over Cable) system, and MoCA (Multimedia over CoaxAlliance) system are all based on the traditional ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a novel integrated two-way tuner that integrates the adjustable multiplexer and the tuner, thereby solving the problem that when the adjustable multiplexer is placed outside the tuner, many devices are used and the cost is low. High, the problem that extra loss is big, in order to realize the purpose of this invention, the technical scheme that the present invention adopts is:

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