KR100434472B1 - Signal combining/splitting device and a method, particularly for combining digital cable tv signal with telephone signal and splitting the combined signals - Google Patents

Abstract

PURPOSE: A signal combining/splitting device and a method are provided to construct a multimedia environment without influencing a telephone service, and to isolate a telephone signal from data so as not to generate a data error by the telephone signal while transmitting the data by using a telephone line, thereby simultaneously supplying telephone and data services through the telephone line. CONSTITUTION: The first combiner/splitter(31) outputs a signal of a telephone signal band to a transmission line by comprising a low band filter, splits a telephone signal of the transmission line, and transmits the splitted signal to a telephone subscriber. The second combiner/splitter(32) outputs a signal of a video signal band to the transmission line by comprising a high band filter, splits a video signal of the transmission line, and transmits the splitted video signal to a television subscriber.

Description

Signal Combination / Disconnection Device and Method

The present invention relates to a signal combining / separating apparatus and method, and more particularly, to an apparatus and method capable of combining and separating digital television signals and telephone signals.

In general, in a system for outputting or receiving signals having different frequencies through a single transmission line, a device for separating signals from a device for combining signals is required, i.e., transmitting signals with different frequencies such as data and telephone signals. When transmitting through a furnace, it is essential to have a combiner for performing a data + telephone signal function and a splitter for separating a signal received in a transmission path.

In the technology of a cable modem, according to the technology change of HDSL → ADSL → VDSL, an increase in transmission speed, an increase in a use frequency band, and a use frequency have increased. At this time, the ADSL has become a technology to commercialize the Internet service (internet service), and the digital cable television (D-CATV) signal, which will be promoted in the future, has a higher transmission speed and a higher frequency than the ADSL. Increasing VDSL technology will be used. Therefore, since the frequency varies according to the type of cable modem introduced in the system, the configuration of the combiner and the separator to be applied to the system must also be different.

Currently, CATV service uses coaxial cable, and VOD (video on demand) service uses ADSL. Here, the VOD service refers to a function of allowing a local telephone company or a CATV broadcaster to provide a subscriber with a desired video at any time.

The D-CATV service currently being promoted is attempted to be commercialized using a telephone line. At this time, the ADSL uses a transmission speed of 1.5Mbps to 9Mbps, and the use frequency uses a frequency of 1.5MHz or less. VDSL, however, uses a transmission rate of 51.84Mbps and uses frequencies below 30MHz. Therefore, the function of the combiner / separator of the D-CATV signal and the telephone signal is the same as that of the ADSL, but there are many differences in the internal structure according to the values or specifications of the components due to the frequency difference according to the configuration.

Accordingly, the present invention provides an apparatus and method for combining and separating digital cable television signals and telephone signals.

In order to achieve the above object, a signal combining and separating apparatus according to an embodiment of the present invention includes a low pass filter to output a signal of a telephone signal band to a transmission line, and to separate a telephone signal of a transmission line and transmit the signal to a telephone subscriber. A telephone having a first combiner / separator and a second combiner / separator for outputting a signal of a video signal band to a transmission line with a high frequency filter and separating the image signal of the transmission line and transmitting the signal to a television subscriber, each having a different frequency. It is characterized in that the signal and the video signal is combined and transmitted to one transmission line, and each signal on the combined transmission line is separated and transmitted to the corresponding subscriber side.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing the frequency characteristics of a broadcast signal and a telephone signal of a digital cable television system on a transmission line.

2 is a diagram showing the configuration of a combiner for combining a telephone signal and a digital cable television signal and outputting it to a transmission line and a separator for separating the telephone signal and the digital cable television signal on the transmission line according to an embodiment of the present invention.

3 illustrates a configuration of a combiner / separator according to an embodiment of the present invention.

4 is a simplified diagram of a combiner / separator having the same configuration as in FIG.

FIG. 5 shows the output characteristics of the first combiner / separator in FIGS. 3 and 4.

6 shows the output characteristics of the second coupler / separator in FIGS. 3 and 4;

1 illustrates the frequency bands of the D-CATV signal and the telephone signal when transmitting the D-CATV signal and the telephone signal in one transmission line according to an embodiment of the present invention. 2 is a combiner 11 for combining the D-CATV signal and the telephone signal as shown in FIG. 1 and outputting the same to the transmission line 12, and separately separating the combined D-CATV signal and the telephone signal received on the transmission line 12, respectively. The configuration of separator 13 is shown. Here, the transmission line 12 becomes a general telephone line.

The combiner 11 combines a telephone signal and a television broadcast signal having the frequency characteristics as shown in FIG. 1, and a separator 13 for separating the combined signal received from the transmission line into a telephone signal and a television broadcast signal, respectively. Have 3 is a block diagram of a device for combining and separating a telephone signal and a television signal according to an embodiment of the present invention, and FIG. 4 is a simplified diagram of the structure of a combiner / separator as shown in FIG.

3 and 4, the first combiner / separator 31 connected between the telephone signal POTS and the transmission line 12 includes a low pass filter consisting of capacitors C1-C5 and inductors L1-L2. Pass Filter, Elliptic function, 4th order) configuration. The first combiner / separator 31 having the configuration as shown in FIGS. 3 and 4 has the same characteristics as in FIG. 5, and filters and extracts the signal of the telephone signal POTS band, and blocks other band signals. In addition, the second combiner / separator 32 connected between the television broadcast signal data and the transmission line 12 has a high pass filter (Elliptic function, 4th order) composed of capacitors C6-C13 and inductors L3-L4. The second combiner / separator 32 having the configuration as shown in FIGS. 3 and 4 has the characteristics as shown in FIG. 6, and filters and extracts the signal of the television signal data band and blocks the signal of the telephone signal POTS band.

First, an operation of combining the telephone signal POTS and the television signal data will be described. The first combiner / separator 31 isolates the telephone signal (call power -48V, ring) from the transmission line so as not to affect the transmission of the television signal data, and the call power -48V and the ring signal. Therefore, it should be possible to output the voice signal to the transmission line without distortion or interference. In addition, the second combiner / separator 32 transmits a television signal having a frequency band of 6 MHz-30 MHz without interference to the transmission line.

Second, the operation of separating the combined signal of the telephone signal POTS and the television signal data on the transmission line 12 will be described. The first combiner / separator 31 performs low pass filtering so as to separate a telephone signal of 4 KHz or less, which is a telephone signal band, and an ISDN signal of 80 KHz or less from a signal coupled on the transmission line. Therefore, the signal output to the telephone subscriber becomes a signal in the pure telephone signal band in which the television signal is cut off. In addition, the second combiner / separator 32 performs high frequency filtering to separate the signal of the television signal data band from the combined signal on the transmission line. Therefore, the high frequency frequency of the television band in which the telephone signal band is cut off is output to the signal output to the television subscriber side.

Therefore, the first combiner / separator 31 connected between the subscriber and the transmission line 12 has a filter characteristic as shown in FIG. 5 and does not affect the television signal data when combining the telephone signal POTS with the television signal data. It isolates and transmits the telephone signal to the transmission line without distortion and interference. When separating the combined signal, it filters out the band of the telephone signal and ISDN signal and separates it from the television signal data. In addition, the second combiner / separator 32 connected between the television subscriber and the transmission line 12 has a filter characteristic as shown in FIG. 6, and when the television signal data is combined with the telephone signal POTS, the television signal data of 6 MHz-30 MHz band is received. The transmission signal is transmitted to the transmission line without interference to the telephone signal. When the combined signal is separated, only the band signal of the television signal data is separated from the telephone signal POTS and the television signal data existing in the transmission line.

As described above, when using a VDSL modem for services such as D-CATV, VOD, home banking, and the like, a multimedia environment can be constructed using a combiner / separator required for the subscriber and interface, and has no effect on the telephone service during the service. May not interfere. When the data is transmitted using the telephone line, the telephone signal and the data are isolated so that there is no data error due to the telephone signal. Therefore, the telephone line and the data can be simultaneously serviced through one telephone line.

Claims (2)

In the device for combining and separating signals, A first combiner / separator for outputting a signal of a telephone signal band to a transmission line with a low pass filter, and for separating a telephone signal of a transmission line and transmitting the signal to a telephone subscriber; A second combiner / separator for outputting and separating the video signal of the transmission line and transmitting it to the television subscriber side, And combining and transmitting telephone signals and video signals having different frequencies, respectively, into one transmission line, and separating and transmitting the signals on the combined transmission lines to the corresponding subscribers. How to combine and separate signals, Low frequency filtering the signal of the telephone signal band and outputting it to the transmission line and high frequency filtering the signal of the video signal band and outputting it to the transmission line, separating and combining two signals of different bands into one transmission line; A method of combining and separating signals comprising receiving a signal coupled through a transmission line and performing low frequency filtering on a telephone signal band and high frequency filtering on a video signal band, and outputting them separately to corresponding subscribers and television subscribers, respectively.

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