KR860002212B1 - Output amplifer for active reduction protecting circuit - Google Patents
Output amplifer for active reduction protecting circuit Download PDFInfo
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- KR860002212B1 KR860002212B1 KR1019830005694A KR830005694A KR860002212B1 KR 860002212 B1 KR860002212 B1 KR 860002212B1 KR 1019830005694 A KR1019830005694 A KR 1019830005694A KR 830005694 A KR830005694 A KR 830005694A KR 860002212 B1 KR860002212 B1 KR 860002212B1
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- signal
- noise
- transmission line
- power amplifier
- noise signal
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- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 230000005415 magnetization Effects 0.000 claims abstract 2
- 230000008054 signal transmission Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000004804 winding Methods 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalanced currents in a normally balanced line
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/28—Reducing interference caused by currents induced in cable sheathing or armouring
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- Computer Networks & Wireless Communication (AREA)
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- Noise Elimination (AREA)
Abstract
Description
제1도는 본 발명에 따른 잡음감쇄회로의 첫번째 실시예를 보여주는 개략도.1 is a schematic view showing a first embodiment of a noise reduction circuit according to the present invention.
제2도는 본 발명에 따른 잡음감쇄회로의 두번째 실시예를 보여주는 개략도.2 is a schematic view showing a second embodiment of the noise reduction circuit according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 신호전송선 2 : 전치 증폭기1: signal transmission line 2: preamplifier
3 : 리드선 4, 12 : 저역필터3: lead wire 4, 12: low pass filter
5 : 가산증폭기 6, 10 : 전력증폭기5: addition amplifier 6, 10: power amplifier
7 : 출력 9 : 보조증폭기7: output 9: auxiliary amplifier
11 : 아날로그스위치11: analog switch
본발명은 신호전송선에서 발생되는 잡음신호가 일정한 주파수로 외계(外界)로부터 유입될 때, 전화기시스템의 음감저하를 확실히 막아주기 위한 잡음감쇄회로에 관한 것이다.The present invention relates to a noise reduction circuit for reliably preventing sound deterioration of a telephone system when a noise signal generated from a signal transmission line is introduced from an external field at a constant frequency.
독일특허 DE-PS 16 90 370에는, 전화선 또는 전화케이블의 외부자장 즉 외계로부터 유도된 신호전송선의 잡음신호를 빼내어, 전력증폭기에서 증폭시킨 다음 각 해당신호전송선의 연결링크인 트랜스에 연결하는 방법이 기술되어 있다.German Patent DE-PS 16 90 370 describes a method of extracting a noise signal of an external magnetic field of a telephone line or a telephone cable, that is, a signal transmission line induced from the outside, amplifying it in a power amplifier, and then connecting the transformer to a transformer which is a connection link of each corresponding signal transmission line Described.
여기서는 트랜스의 1차권선에는 전력증폭기의 출력을 위치시키고, 2차권선에는 각각의 신호를전송선에 보내는 것이 특징이다. 또한 독일특허 DE-PS 17 65 629에는 연결링크의 자화(磁化) 작용부로 연결링크의 외피를 이용하는 방법이 기술되어 있다. 한편, 독일특허 DE-OS 29 26 092에서는, 전력증폭기와 연결링크 사이에 있는 리드선에 위상차가 생기게 하여, 나머지 잡음신호를 신호전송선의 연결링크 뒷쪽으로 빼내어 보조 증폭기를 지나게 하고 난 다음 전력증폭기의 입력으로 보내는 방법이 기술되어 있다.In this case, the output of the power amplifier is placed in the primary winding of the transformer, and each signal is sent to the transmission line in the secondary winding. In addition, DE-PS 17 65 629 describes a method of using the outer shell of the link as a magnetizing action of the link. On the other hand, in German patent DE-OS 29 26 092, there is a phase difference in the lead line between the power amplifier and the connection link, and the remaining noise signal is pulled out behind the connection link of the signal transmission line, passing through the auxiliary amplifier, and then input of the power amplifier. How to send it is described.
상기한 기술의 결선방법은 주파수 범위가 16, 67, 50, 60 및 300Hz로부터 약 4KHz 까지인 경우에 이용된다. 그러나, 잡음신호로서 저주파수가 발생될 경우, 이같은 결선방법으로는 잡음만 증가한다.The connection method of the above technique is used when the frequency range is from 16, 67, 50, 60 and 300 Hz to about 4 KHz. However, when low frequency is generated as a noise signal, only the noise increases with this connection method.
이러한 저주파수에서는 실제로 연결링크가 단락현상을 나타내므로 전력증폭기에서는 과전류가 흐르지않도록 할필요가 생긴다. 이때문에 선로(線路)를 보호하기 위해 잡음피크를 피하여 경우에 따라서는 동일잡음신호 이상으로 진폭을 크게할 수도 있다. 이외에도 증폭기의 최종단계에 과중한 부하가 걸리지 않도록 한다.At such low frequencies, the connection link actually shows a short circuit, so there is a need to prevent overcurrent from flowing in the power amplifier. For this reason, in order to protect the line, the noise peak may be avoided, and in some cases, the amplitude may be increased beyond the same noise signal. In addition, the final stage of the amplifier should not be overburdened.
저주파수를 감쇄시키기 위해 하이패스 필터를 이용하는 것은 효과가 없다. 오히려 높은 그룹전송시간(group transmiss ion time)으로 전력증폭기의 입력과 출력 사이에 위상차가 생기며, 경우에 따라 잡음신호의 감소가 아니라 증폭이 일어나게 된다. 본 발명의 목적은 전력증폭기를 결선시켜 잡음신호를 억제시킬 뿐 아니라 어떠한 저주파도 허용하지 않게끔 하는 것이다.Using a highpass filter to attenuate low frequencies is ineffective. Rather, a high group transmiss ion time results in a phase difference between the input and the output of the power amplifier. In some cases, amplification occurs rather than a reduction in the noise signal. It is an object of the present invention to connect the power amplifier to suppress the noise signal as well as not to allow any low frequencies.
이러한 본발명의 목적은, 신호전송선에서 나온 잡음신호가 이미 주어진 주파수 범위 이하의 주파수인 경우에는 반전형 저역필터에 충분히 작은 전송시간동안 있게 하는데, 이 저역필터의 출력과 신호전송선이 가산증폭기의 앞에 위치되게하고, 가산증폭기의 출력이 전력증폭기의 입력에 결선되도록 하여 달성될 수있다.The purpose of this invention is to provide an inverted low pass filter with a sufficiently small transmission time if the noise signal from the signal transmission line is already below the given frequency range, and the output of the low pass filter and the signal transmission line are placed in front of the addition amplifier. By positioning the output amplifier of the add amplifier to the input of the power amplifier.
본 발명의 다른 실시예로는, 전력증폭기 앞에 잡음신호를 위해 저역필터 앞에서 빈번히 이용되는 전치증폭기를 설치 할수도 있다. 본 발명의 다른 특징과 목적은 첨부도면을 참조하여 상세히 기술코자 한다.In another embodiment of the present invention, a preamplifier that is frequently used in front of a low pass filter for a noise signal may be installed in front of the power amplifier. Other features and objects of the present invention will be described in detail with reference to the accompanying drawings.
제1도는 본 발명에 따른 증폭기의 첫번째 실시예의 개략도인데, 참조번호(1)는 신호전송선으로 이곳에서 잡음신호가 유입되며, 그 뒤에는 전치증폭기(2)가 위치되어 잡음신호를 받아들인다. 잡음신호는 전치증폭기(2)를 지나 리드선(3)을 통과하여 가산증폭기(5)의 앞에 있는 본 발명에 따른 반전형 저역필터로 보내진다. 저역필터(4)에서는 반전현상이 일어나 잡음신호가 감소되어 나와 리드선(3)을 통해 지나가게된다. 본 발명에 따른 실시예에서는 저역필터로서 3dB-리플을 갖는 체비세프 필터를 이용한다. 처음에 전력증폭기(6)에 도달한 잡음신호는 이곳에서 머물렀다가 연결 링크의 출력(7)으로 빠져 나간다.1 is a schematic diagram of a first embodiment of an amplifier according to the present invention, in which reference numeral 1 denotes a signal transmission line, in which a noise signal is introduced, followed by a preamplifier 2 to receive a noise signal. The noise signal is passed through the preamplifier 2, through the lead wire 3, and sent to the inverting low pass filter according to the present invention in front of the addition amplifier 5. In the low pass filter 4, an inversion occurs, and a noise signal is reduced to pass through the lead wire 3. In the embodiment according to the present invention, a Chebyshev filter having 3 dB-ripple is used as the low pass filter. The noise signal initially reaching the power amplifier 6 stays here and exits to the output 7 of the connecting link.
공지의 방법으로 전력증폭기의 출력에서 입력으로 다시 되돌려 보내게 할수도 있는데, 이게이 본 발명의 목적이나 필수적인 기능은 아니다. 전력증폭기에 있어서, 신호전송선의 연결링크 뒷쪽에서 감소 된잡음신호를 빼내어 보조증폭기를 통해 전력증폭기의 두번째 입력으로 보내는데 이때 저주파수를 갖는 새로운잡음신호가 전력증폭기의 입력으로 들어가는 것을 막기위해 아날로그 스위치를 설치하여 전력증폭기에서 보조증폭기를 분리하고 저역필터만이 이용되게끔 할수도 있다.It is also possible to send the power amplifier back from the output to the input in a known manner, which is not an object or an essential function of the present invention. In power amplifiers, a reduced noise signal is extracted from the back of the link of the signal transmission line and sent through the auxiliary amplifier to the second input of the power amplifier, where an analog switch is installed to prevent new noise signals with low frequencies from entering the input of the power amplifier. It is also possible to separate the auxiliary amplifier from the power amplifier and only use the low pass filter.
제2도는 제1도와 같이 본 발명에 따른 증폭기의 두번째 실시예의 개략도이다. 여기서는 첫번째 실시예에서는 없는 효과가 있다. 즉, 참조번호(8)에서 신호전송선의 연결링크 뒷쪽에서 감소된 잡음신호가 유도되는 것이다. 보조증폭기(9)를 통해 전력증폭기(10)의 입력으로 감소된 잡음신호가 보내진다.2 is a schematic representation of a second embodiment of an amplifier according to the invention as in FIG. There is no effect here in the first embodiment. That is, the reduced noise signal is induced at the back of the connection link of the signal transmission line at reference numeral 8. A reduced noise signal is sent to the input of the power amplifier 10 via the auxiliary amplifier 9.
본 발명의 실시예에서는 보조증폭기(9)와 전력증폭기(10) 사이에 아날로그 스위치(11)가 설치되어 있어 저역필터(12)의 사용시 보조증폭기(9)에서 전력증폭기(10)에 이르는 리드선을 단락시킬 수 있다.In the embodiment of the present invention, an analog switch 11 is installed between the auxiliary amplifier 9 and the power amplifier 10 so that the lead wire from the auxiliary amplifier 9 to the power amplifier 10 when the low pass filter 12 is used. You can short circuit.
본 발명에 따른 전력증폭기도 역시 독일특허 DE-PS 17 65 629에 따라 연결링크의 자화작용부로 보호케이블의 외피를 이용할수도 있으며 각각의 케이블 형태마다 보다나은 적합도를 위해 전치증폭기와 저역필터 사이에 진상기(進相機)를 설치할 수 있는 것도 장점이 된다.The power amplifier according to the invention can also use the outer sheath of the protective cable as the magnetizing action of the connection link in accordance with German patent DE-PS 17 65 629, and between the preamplifier and the low pass filter for better suitability for each cable type. It is also advantageous to be able to provide the above.
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3245863.0 | 1982-12-11 | ||
DEP32458630 | 1982-12-11 | ||
DE3245863 | 1982-12-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR840007329A KR840007329A (en) | 1984-12-06 |
KR860002212B1 true KR860002212B1 (en) | 1986-12-31 |
Family
ID=6180393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019830005694A KR860002212B1 (en) | 1982-12-11 | 1983-12-01 | Output amplifer for active reduction protecting circuit |
Country Status (4)
Country | Link |
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JP (1) | JPS59115629A (en) |
KR (1) | KR860002212B1 (en) |
FR (1) | FR2537807B3 (en) |
NL (1) | NL8303881A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3325770B2 (en) * | 1996-04-26 | 2002-09-17 | 三菱電機株式会社 | Noise reduction circuit, noise reduction device, and noise reduction method |
-
1983
- 1983-11-11 NL NL8303881A patent/NL8303881A/en not_active Application Discontinuation
- 1983-12-01 KR KR1019830005694A patent/KR860002212B1/en active
- 1983-12-07 JP JP58230001A patent/JPS59115629A/en active Pending
- 1983-12-12 FR FR8319867A patent/FR2537807B3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
KR840007329A (en) | 1984-12-06 |
FR2537807B3 (en) | 1985-09-27 |
JPS59115629A (en) | 1984-07-04 |
NL8303881A (en) | 1984-07-02 |
FR2537807A1 (en) | 1984-06-15 |
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