KR100412200B1 - Splitter and combiner - Google Patents

Abstract

The present invention divides or mixes an input signal by a two-way splitter or a two-way mixer with one or two stage splitters and mixers, in which attenuators, equalizers, filters, etc. are serially placed in front of the splitter or mixer. It is possible to improve the quality of the entire network connecting the supplier and the multiple subscribers by stabilizing the input signal input to the distributor or mixer by connecting to the network.

Description

Signal splitter and combiner with integrated attenuator, equalizer and filter {Splitter and combiner}

The present invention relates to a dispensing and mixing device for distributing and mixing input signals. More particularly, the present invention relates to a supplier and a subscriber by installing an attenuator, an equalizer, and a filter in front of a distributing and mixing device. The present invention relates to a signal distribution and mixing device incorporating an attenuator, an equalizer, and a filter for improving the quality of the entire network connecting the circuit.

Figures 1a and 1b shows a conventional distribution and mixing device for input signal distribution and mixing, Figure 1a shows a distributor for distributing an input signal from the operator to the subscriber, Figure 1b is an input from the subscriber It shows a mixer for supplying signals to operators.

Conventional distributors or mixers simply connect two-way distributors or two-way mixers in one or two stages to distribute or mix the input signal input through the cable. However, since the intensity of the input signal input to the distributor or mixer is different for each region, and an input signal having a level higher than that of the reference signal of the distributor or mixer is input, a separate attenuator is installed outside the distributor or mixer. This results in an increase in the number of contacts, which leads to a lower reliability of failure.

In addition, the lower the frequency, the greater the loss, since the attenuation of the signal is almost proportional to the square root of frequency. Therefore, if the signal is distributed or amplified without correction by the equalizer EQ, the quality of the signal in the low frequency band may be significantly degraded.

In addition, there is a drawback that the quality of the entire network is degraded due to interference in the frequency band due to no filter in the distributor or mixer.

The present invention has been proposed in order to solve the above-mentioned drawbacks. The present invention provides an attenuator, an equalizer and a filter in front of a distribution and mixer to connect a supplier and a subscriber. Its purpose is to provide a signal distribution and mixing device with built-in attenuators, equalizers, and filters to improve quality.

1A is a schematic diagram illustrating a distribution device for distributing a conventional input signal.

Figure 1b is a schematic configuration diagram showing a mixing device for mixing the conventional input signal.

2 is a schematic structural diagram showing a first embodiment of a splitter for distributing an input signal according to the present invention.

3 is a schematic structural diagram showing a second embodiment of a distribution device for distributing an input signal according to the present invention.

Figure 4 is a schematic structural diagram showing a first embodiment of a mixing device (combiner) for mixing the input signal according to the present invention.

5 is a schematic structural diagram showing a second embodiment of a mixing device for mixing input signals according to the present invention.

6 is a graph showing the characteristic of the loss frequency that is varied by insertion of the distribution device.

7 is a graph showing attenuation characteristics of the equalizer EQ.

8 is a graph illustrating the characteristics of a signal passing through an attenuator.

9 is a graph showing the characteristics of a signal corrected by an equalizer.

10A is a graph showing signal characteristics before passing through a filter.

10B is a graph showing signal characteristics after passing through a filter.

※ Explanation of code about main part of drawing ※

21, 21a, 31a, 31b, 31c, 31d, 41a, 41b: attenuator

Equalizer: 22, 22a, 32a, 32b, 32c, 32d, 42a, 42b

23,23a, 33a, 33b, 33c, 33d, 43a, 43b: Filter

24, 24a, 25, 26: 2-way distributor 34a, 34b, 35, 44: Mixer

Distributing apparatus for distributing an input signal according to the present invention for achieving the above object, the attenuator for adjusting the amount of attenuation of the input signal according to the difference between the input signal and the reference signal through the cable, An equalizer for correcting the input signal lost in proportion to the square root of the frequency to a flat signal, and a filter for preventing interference with other frequencies by passing only signals of a predetermined frequency band among the input signals through the equalizer And at least one two-way splitter having a hybrid transformer for equally distributing one input signal through the filter into two or more output signals.

The attenuator may be a digital attenuator that changes the input signal into a digital state in a reference step (e.g., 2 dB, 4 dB, 8 dB ...) or an analog attenuator that arbitrarily varies the input signal (e.g., 3 dB, 4 dB, 7 dB ...). It is appropriate to use

In addition, the filter has a characteristic of a band pass filter that passes only the frequency of the downlink signal of the input signal through the equalizer.

In addition, the mixing device for mixing the input signal according to the present invention, an attenuator for adjusting the amount of attenuation of the input signal according to the difference between the input signal and the reference signal through the cable, and the attenuator is proportionally lost in frequency An equalizer for correcting the input signal to a flat signal, a filter for preventing interference with other frequencies by passing only signals of a predetermined frequency band among the input signals through the equalizer, and two input signals through the filter It characterized in that it comprises one or more two-way mixer with a hybrid transformer for mixing evenly into one output signal.

As the attenuator, it is preferable to use a digital attenuator for varying the input signal in a digital state or an analog attenuator for varying the input signal in an analog state.

In addition, the filter has a characteristic of a band pass filter that passes only the frequency of the uplink signal of the input signal through the equalizer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Conventionally, since communication between a provider (CATV provider) and a plurality of subscribers is performed in one direction, that is, in a two-way manner from distributing a predetermined signal from a supplier to a plurality of subscribers, a plurality of input signals are provided to a distributor that distributes broadcast signals. The mixer's ability to mix with the signal of was added.

That is, the distributor consisting of one distributes the signals to deliver a single signal output from the supplier to a plurality of subscribers, the mixer mixes a plurality of signals collected from a plurality of subscribers into a single signal and delivers to the supplier Two-way communication between the subscriber and the subscriber is made.

In particular, in the present invention, the attenuator, equalizer, and filter may be hypothesized at the front of the distributor and the mixer, thereby improving the quality of the entire network connecting the supplier and the subscriber.

FIG. 2 is a diagram illustrating a distributor for distributing a signal so that a single input signal supplied from a supplier may be transmitted to a plurality of subscribers installed in a cable connecting a provider and a subscriber, and input through a cable (not shown). In the attenuator 21 to which a signal is input, the attenuation amount of the input signal supplied from a supplier may be adjusted after obtaining the difference value from the reference signal.

In this way, the attenuator 21 is used to adjust the amount of attenuation of the input signal while the network for transmitting and receiving the input signal is changed into a digital state, that is, a step, and the input signal is analog. The method to change is mentioned.

Here, in the step-variable method, the amount of attenuation of the signal can be adjusted for each step, and in the method of changing to an analog state, the installer gives an input signal by using an adjustment lever of the attenuator 21 not shown outside of the distributor. The amount of attenuation can be adjusted arbitrarily within the range. However, since the input signal is already amplified at the front end, it is not necessary to consider amplification separately in the splitter. Since the level of the input signal at the place of installation once in each region is hardly changed, the attenuation amount of the attenuator 21 is installed. It is enough to adjust once.

In addition, since the attenuation of the input signal by the attenuator 21 is almost proportional to the square root of the frequency, the more the curse file, the greater the loss. FIG. 6 shows an example of the cable-only case and the flat loss in the signal loss for each frequency band.

The input signal attenuated by the attenuator 21 having the attenuation characteristic as shown in FIG. 8 is corrected as shown in FIG. 9 while passing through the equalizer 22 having the attenuation characteristic as shown in FIG. Is entered.

Then, the filter 23 filters the unnecessary band signal in FIG. 10A to prevent interference in an unused band and passes only the frequency of 5 to 42 MHz among the input signals as shown in FIG. Enter it.

Accordingly, the plurality of distributors 24, 25, and 26 having the hybrid transformer evenly distribute the input signals input from the filter 23 into four output signals and transmit them to the subscribers.

3 is another embodiment of the divider according to the present invention. In FIG. 2, the input signal is divided into two stages and four output signals. In FIG. 3, the input signal is divided into two output signals using the divider of one stage. Doing. Then, the attenuator 21a, equalizer 22a and filter 23a provided in front of the distributor 24a operate in the same manner as the attenuator, equalizer and filter of FIG. 2 above.

FIG. 4 illustrates a mixer installed in a cable connecting a subscriber and a supplier to mix (synthesize) signals so that a plurality of input signals collected from a plurality of subscribers can be transmitted to a provider. In the attenuators 31a, 31b, 31c, and 31d into which the input signal is input, the attenuation amount of the input signal collected from the subscriber may be adjusted after obtaining the difference value from the reference signal.

As described above, the attenuation amount of the input signal is adjusted using the attenuators 31a, 31b, 31c, and 31d during the installation of the network for transmitting and receiving the input signal. step) and a method of arbitrarily varying an input signal in an analog state, that is, within a given range of values.

Here, in the method of varying the steps, the amount of attenuation of the signal can be adjusted for each step, and in the method of changing to the analog state, the installer of the attenuators 31a, 31b, 31c, 31d, which is not shown outside of the mixer, can be adjusted. The control lever can be used to adjust the amount of attenuation of the input signal. However, since the input signal is already amplified at the front end, it is not necessary to consider amplification separately in the mixer, and since the level of the input signal at the place of installation once in each location is hardly changed, the attenuators 31a and 31b ( The amount of attenuation of 31c) and 31d may be enough to be adjusted once at the time of installation.

Further, since the attenuation of the input signal by the attenuators 31a, 31b, 31c, and 31d is almost proportional to the square root of the frequency, the loss of the curb is increased. FIG. 6 shows an example of the cable-only case and the flat loss in the signal loss for each frequency band.

An input signal attenuated by the attenuators 31a, 31b, 31c, and 31d having the attenuation characteristics as shown in FIG. 8 is equalizers 32a, 32b, and 32c having the attenuation characteristics as shown in FIG. It is smoothly corrected as shown in FIG. 9 via 32d) and input to the filters 33a, 33b, 33c, 33d.

Then, the filters 33a, 33b, 33c, 33d filter out signals of unnecessary bands in FIG. 10A to prevent interference in unused bands, and then filter 54 to 750 MHz of the input signals as shown in FIG. Only the frequency is passed through and input to the mixers 34a and 34b.

Accordingly, the plurality of mixers 34a, 34b, 35 with hybrid transformers mix the input signals input from the filters 33a, 33b, 33c, 33d into one output signal to the supplier. send.

FIG. 5 illustrates another embodiment of the mixer according to the present invention. In FIG. 4, four input signals are mixed into one output signal and provided to a supplier. They are mixed in one output signal. The attenuators 41a, 41b, equalizers 42a, 42b, and filters 43a, 43b provided at the front end of the mixer 44 have the same input signals as the attenuators, equalizers, and filters in FIG. To process

According to the present invention, an attenuator, an equalizer, and a filter are installed at the front of the distribution and mixer, thereby improving the quality of the entire network connecting the supplier and the subscriber.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the present invention, and such modifications and modifications belong to the appended claims.

Claims (2)

In a signal distribution device incorporating an attenuator, equalizer, and filter configured to divide and output one input signal into a plurality of output signals by a divider or to mix and output a plurality of input signals into a single output signal by a mixer. , Configure an attenuator, equalizer and filter in front of the distributor or mixer, And the attenuator, equalizer, and filter are built in the divider or mixer in different combinations. delete