Patent Application
20120092087
1. Fields of the Invention
The present invention relates to a noise reduction device for ports of DSL filters and a method thereof, especially to a noise reduction device for ports of DSL filters and a method thereof by which no interference noise occurs between two adjacent signal transmission lines when signals transmitted are output. Thus the device has a higher practical value while in use.
2. Descriptions of Related Art
The development of modern technology leads to the prosperous development of computer network. Internet has become an essential part in our daily lives. One of the most ways that people access internet connections, DSL (Digital Subscriber Line) is a modulation/demodulation technology that uses ordinary telephone wiring to deliver fast digital data transmission and network service while at the same time providing POTS (Plain Old Telephone Services).
DSL is constructed based on standard copper pair of telephone facilities available now, It does this by utilizing frequencies that are not used by a voice telephone call. Thus DSL deliver a high-speed, downstream channel to subscribers and a lower-speed, upstream channel to the network without affecting the analog telephone service used.
In use, signals are filtered by filters and the filtered signals are sent to corresponding electronic devices by ports. Refer to
However, during the signal transmission process of DSL, a problem occurs, Generally, signal transmission lines between ports of DSL filter are arranged closely to each other so that interference occurs between two adjacent transmission lines respectively of two different signal transmission line sets during signal transmission processes. Noise in the signals transmitted is increased and this deteriorates DSL transmission quality.
Thus there is a need to provide a noise reduction device for ports of DSL filters and a method thereof that overcome above shortcomings and has a higher practical value.
Therefore it is a primary object of the present invention to provide a noise reduction device for ports of DSL filters and a method thereof A plurality of signal transmission line sets is disposed on the ports of a DSL filter. Between two adjacent signal transmission line sets, a first cross part is formed at an input end of the first signal transmission line and the second signal transmission line of the first signal transmission line set. Before the first cross part, the first signal transmission line of the second signal transmission line set is adjacent to the second signal transmission line of the first signal transmission line set. Yet after the first cross part, the first signal transmission line of the second signal transmission line set is adjacent to the first signal transmission line of the first signal transmission line set. Thus the noises of the first signal transmission line of the second signal transmission line set induced by interference between the first signal transmission line of the second signal transmission line set and the first/second signal transmission line of the first signal transmission line set cancel each other out. Thereby during output of the signals transmitted by the port, noises induced by the interference between the two adjacent signal transmission lines are eliminated. Thus the device has a higher practical value in use.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:
Refer to
Between two adjacent signal transmission line sets 14, the first signal transmission line 141 and the second signal transmission line 142 of the first signal transmission line set 14 cross each other to form a first cross part 143. Before the first cross part 143, the second signal transmission line 142 of the first signal transmission line set 14 is beside the first signal transmission line 141 of the second signal transmission line set 14. After the first cross part 143, the lines change into that the first signal transmission line 141 of the first signal transmission line set 14 is adjacent and closer to the first signal transmission line 141 of the second signal transmission line set 14. In order to make the first signal transmission line 141 and the second signal transmission line 142 of each signal transmission line set 14 at the circuit board connection area 11 and the connection end 12 arrange in the same order, at output ends, the first signal transmission line 141 and the second signal transmission line 142 of the first signal transmission line set 14 cross each other to form a second cross part 144. Thus after passing the second cross part 144, the first signal transmission line 141 of the second signal transmission line set 14 is changed to become closer to the second signal transmission line 142 of the first signal transmission line set 14.
Also refer to
In summary, compared with the structure available now, the present invention includes the first cross part before which the first signal transmission line of the second transmission line set is adjacent to the second signal transmission line of the first transmission line set. Yet after the first cross part, the first signal transmission line of the second transmission line set is adjacent to the first signal transmission line of the first transmission line set. Thus the noises induced by interference between the adjacent first signal transmission line of the second signal transmission line set and the first signal transmission line/the second signal transmission line of the first signal transmission line set cancel each other out. Therefore, there is no interference noises between two adjacent signal transmission lines while signals transmitted by the port being output. The device has a high practical value in use.
Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
