TWI481249B - Splitter for splitting voice data and adsl data - Google Patents

Description

Separator for separating voice signals from data signals

The present invention relates to the field of communications, and in particular, to a splitter for separating voice signals and data signals.

With the development of digital data services, ADSL (Asymmetric Digital Subscriber Loop) has become more and more suitable for application and promotion as a more ideal choice for broadband access of traditional telecommunications operators. For example, the user can receive ADSL data signals and voice signals from the ISP (digital data provider) through the same telephone line, and can perform voice services (such as making a phone call) while surfing the Internet. Since the data signal and the voice signal are transmitted on the same telephone line, the frequency of the voice signal is generally between (20 Hz and 4 kHz), and the ADSL data signal is between (25 kHz and 1104 kHz), in order to avoid crosstalk between the two interfaces. Influencing the quality of signal transmission requires a separate circuit for completely separating the voice signal and data signal.

In view of the above, it is necessary to provide a splitter that can completely separate voice signals and data signals at a lower cost.

A splitter for separating a voice signal and a data signal, comprising: an input end, a first output end, and a second output end, and a first inductive transformer and a second inductive transformer connected in series, the second inductive transformer includes a a core, and a first coil winding and a second coil winding connected to the iron core and connected in series, the first coil The first connection end and the fourth connection end of the winding are respectively connected to the second connection end and the third connection end of the first inductive transformer, and the first connection end and the fourth connection end of the second coil winding are respectively connected to the first coil winding The second connecting end is connected to the third connecting end, and the first connecting end and the fourth connecting end of the first inductive transformer are respectively connected with the first capacitor and the second capacitor respectively, and the first coil winding is first a third capacitor is connected in series between the connection end and the fourth connection end, and a fourth capacitor is connected in series between the second connection end and the third connection end of the first coil winding, and the first connection end and the second connection end of the first coil winding are connected in parallel Connecting the first resistor and the fifth capacitor, the second resistor and the sixth capacitor are connected in parallel between the third connection end and the fourth connection end of the first coil winding, and the second connection end and the third connection end of the second coil winding are connected The seventh capacitor is connected in series, and the second connection end and the third connection end of the first coil winding are connected to the second output end.

The above separator uses a coil inductor and a capacitor for high-impedance filtering, and uses fewer electronic components, and the first coil winding of the second inductor transformer shares a core with the second coil winding, and the first coil winding can be utilized. The self-inductance and mutual inductance of the second coil winding are filtered, which not only reduces the manufacturing cost, but also reduces the volume, thereby saving installation space and being convenient for the user.

100‧‧‧Separator

L1‧‧‧First Inductive Transformer

L2‧‧‧Second inductance transformer

20‧‧‧ iron core

21‧‧‧First coil winding

22‧‧‧second coil winding

101, 211, 221‧‧‧ first connection

102, 212, 222‧‧‧ second connection

103, 213, 223‧‧‧ third connection

104, 214, 224‧‧‧ fourth connection

C1‧‧‧first capacitor

C2‧‧‧second capacitor

C3‧‧‧ third capacitor

C4‧‧‧fourth capacitor

C5‧‧‧ fifth capacitor

C6‧‧‧ sixth capacitor

C7‧‧‧ seventh capacitor

R1‧‧‧first resistance

R2‧‧‧second resistance

IN‧‧‧ input

OUT1‧‧‧ first output

OUT2‧‧‧ second output

1 is a circuit schematic diagram of a splitter for separating a voice signal and a data signal according to an embodiment of the present invention.

The separator for separating the voice signal and the data signal is disposed between the telephone line and the user terminal, and can separate the low frequency signal transmitted by the ordinary telephone line from the high frequency signal, for example, a low frequency signal below 3400 Hz. Separated for voice calls, separate high-frequency signals above 25KHZ for Internet access.

Referring to FIG. 1, the input terminal IN of the splitter 100 for separating the voice signal and the data signal according to the embodiment of the present invention is an outdoor line input, which is connected to a telephone line, that is, a plug of a telephone line from a telephone office. The signal input from the input terminal IN includes an ADSL data signal and a telephone voice signal, and the signal is connected to the ADSL MODEM through the first output terminal OUT1, and then the signal passes through a low-pass filter circuit composed of a capacitor inductor behind to isolate the high frequency. The data signal is received at the input end of the telephone at the second output terminal OUT2.

The splitter 100 uses a conjugate coil inductor and a capacitor for high impedance filtering, and includes a first inductive transformer L1 and a second inductive transformer L2 that are sequentially connected in series. The first inductive transformer L1 and the second inductive transformer L2 are both conjugate coil inductances. The second inductive transformer L2 includes a core 20 and is wound around the core 20 and connected to one of the first coil winding 21 and the second coil winding 22 in series. The first inductive transformer L1, the first coil winding 21 and the second coil winding 22 are each provided with four connection ends.

The first connection end 101 and the fourth connection end 104 of the first inductive transformer L1 are respectively connected to the input terminals of the telephone, and the first connection end 211 and the fourth connection end 214 of the first coil winding 21 are respectively connected to the first inductive transformer L1. The second connecting end 102 is connected to the third connecting end 103, and the first connecting end 221 and the fourth connecting end 224 of the second coil winding 22 are respectively connected to the second connecting end 212 and the third connecting end 213 of the first coil winding 21 Connected.

The first capacitor C1 and the second capacitor C2 are connected in series between the first connection terminal 101 and the fourth connection terminal 104 of the first inductive transformer L1 and the output contacts of the first output terminal OUT1. A third capacitor C3 is connected in series between the first connection 211 end of the first coil winding 21 and the third connection end 103, and a fourth capacitor C4 is connected in series between the second connection end 212 of the first coil winding 21 and the third connection end 213. The first connection end 211 and the second connection end 212 of the first coil winding 21 are connected in parallel with the first resistor R1 and the fifth capacitor C5, and the third connection of the first coil winding 21 The second resistor R2 and the sixth capacitor C6 are connected in parallel between the terminal 213 and the fourth connection terminal 214. The seventh capacitor C7 is connected in series between the second connection end 222 of the second coil winding 22 and the third connection end 223. The second connection end 212 and the third connection end 213 of the first coil winding 21 are respectively connected to the two ends of the second output end OUT2. Better impedance matching can be provided by selecting a suitable third to seventh capacitor C3, C4, C5, C6, C7, the capacitive reactance and impedance of the first resistor R1 and the second resistor R2.

The separator 100 has fewer electronic components, and the first coil winding 21 and the second coil winding 22 of the second inductive transformer L2 share a core 20, and the first coil winding 21 and the second coil winding 22 can be utilized. Filtering self-inductance and mutual inductance not only reduces manufacturing costs, but also reduces volume, thereby saving installation space and facilitating user use.

Through experimental comparison, the splitter for separating the voice signal and the data signal in the embodiment of the present invention has better performance. For example, when the frequency of the input signal is between 200 Hz and 2.8 kHz, the range of low frequency insertion loss is -1.0 dB to +1.0 dB; when the frequency of the input signal is between 0.5 kHz and 2 kHz, the range of low frequency return loss is greater than 18 dB; When the frequency of the input signal is between 36kHz and 500kHz, the range of high frequency insertion loss is less than 3dB; when the frequency of the input signal is from 500kHz to 2.2MHz, the range of high frequency insertion loss is less than 1dB; when the frequency of the input signal is at 350KHz to At 1.5MHz, the range of high frequency attenuation is >55dB; when the frequency of the input signal is 1.5MHz to 2.2MHz, the range of high frequency attenuation is >51dB.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Separator

L1‧‧‧First Inductive Transformer

L2‧‧‧Second inductance transformer

20‧‧‧ iron core

21‧‧‧First coil winding

22‧‧‧second coil winding

101, 211, 221‧‧‧ first connection

102, 212, 222‧‧‧ second connection

103, 213, 223‧‧‧ third connection

104, 214, 224‧‧‧ fourth connection

C1‧‧‧first capacitor

C2‧‧‧second capacitor

C3‧‧‧ third capacitor

C4‧‧‧fourth capacitor

C5‧‧‧ fifth capacitor

C6‧‧‧ sixth capacitor

C7‧‧‧ seventh capacitor

R1‧‧‧first resistance

R2‧‧‧second resistance

IN‧‧‧ input

OUT1‧‧‧ first output

OUT2‧‧‧ second output

Claims (3)

A splitter for separating a voice signal and a data signal, comprising: an input end, a first output end, and a second output end, and a first inductive transformer and a second inductive transformer connected in series, the second inductive transformer includes a a core, and a first coil winding and a second coil winding connected to the iron core and connected in series, the first connection end and the fourth connection end of the first coil winding are respectively connected to the second connection of the first inductive transformer The first connection end and the fourth connection end of the second coil winding are respectively connected to the second connection end and the third connection end of the first coil winding, and the first connection of the first inductive transformer a first capacitor and a second capacitor are respectively connected between the terminal and the fourth connecting end and the first output end, and a third capacitor is connected in series between the first connecting end and the fourth connecting end of the first coil winding, and the first coil winding is connected a fourth capacitor is connected in series between the second connection end and the third connection end, and the first resistor and the fifth capacitor are connected in parallel between the first connection end and the second connection end of the first coil winding, and the third coil winding is third a second resistor and a sixth capacitor are connected in parallel between the terminal end and the fourth connecting end, and a seventh capacitor is connected in series between the second connecting end and the third connecting end of the second coil winding, and the second connecting end of the first coil winding is connected in series And a third connection end connected to the second output end. The separator of claim 1, wherein the first inductive transformer and the second inductive transformer are both conjugate coil inductances. The splitter of claim 1, wherein the first output is connected to an ADSL MODEM and the second output is connected to a telephone.