KR970004856B1 - Low noise frequency converter (LNB) with improved polarization characteristics - Google Patents
Low noise frequency converter (LNB) with improved polarization characteristics Download PDFInfo
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- KR970004856B1 KR970004856B1 KR1019940014635A KR19940014635A KR970004856B1 KR 970004856 B1 KR970004856 B1 KR 970004856B1 KR 1019940014635 A KR1019940014635 A KR 1019940014635A KR 19940014635 A KR19940014635 A KR 19940014635A KR 970004856 B1 KR970004856 B1 KR 970004856B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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Abstract
내용 없음.No content.
Description
제1도는 본 발명에 의한 저잡음 주파수 변환기의 측단면도이다.1 is a side cross-sectional view of a low noise frequency converter according to the present invention.
제2도는 본 발명에 의한 고주파(RF) 프린트기판의 평면도이다.2 is a plan view of a high frequency (RF) printed circuit board according to the present invention.
제3도는 제2도에 보인 RF 프린트기판의 측단면도이다.3 is a side cross-sectional view of the RF printed board shown in FIG.
제4도는 본 발명의 다른 실시예에 의한 RF 프린트기판의 측단면도이다.4 is a side cross-sectional view of an RF printed board according to another embodiment of the present invention.
제5도는 종래의 저잡음 주파수 변환기의 측단면도이다.5 is a side cross-sectional view of a conventional low noise frequency converter.
제6도는 종래의 RF 프린트기판의 평면도이다.6 is a plan view of a conventional RF printed board.
제7도는 저잡음 주파수 변환기의 일반적인 구성을 보이는 블록도이다.7 is a block diagram showing a general configuration of a low noise frequency converter.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 피이드혼 2 : 원형도파관1: feed horn 2: circular waveguide
3 : 고주파(RF) 프린트기판 4 : 외장케이스3: RF printed circuit board 4: exterior case
11 : 반사판 22 : 수평편파프로브11: reflector 22: horizontally polarized probe
23 : 수직편파프로브 24 : 드루홀(through hole)23: vertically polarized probe 24: through hole
25 : 유전체25: dielectric
[발명의 목적][Purpose of invention]
[발명이 속한 기술 분야 및 그 분야의 종래 기술][Technical Field of the Invention and Prior Art in the Field]
본 발명은 위성방송수신용 저잡음 주파수 변환기(LNB : Low Noise Blockdown Converter)에 관한 것으로, 특히 서로 수직한 수평편파프로브와 수직편파프로브를 다른 평면상에 배치하여 수신프로브의 편파특성을 개선시킨 저잡음 변환기(이하 LNB라 한다)에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low noise block converter (LNB) for satellite broadcasting reception. In particular, a low noise converter having a horizontal polarization probe and a vertical polarization probe perpendicular to each other on a different plane improves the polarization characteristics of the reception probe. (Hereinafter referred to as LNB).
SHF(Super High Frequency) 콘버터 장치의 일예로써 일반적인 위성방송 수신용 옥외장치인 LNB의 구성을 보이는 블록도를 제7도에 도시한다. 제7도에서, 방송위성으로부터 송신된 전파는 1차 방사기 A에서 픽업되어, 원직선 편파 변환기를 경유하여 도파관 B에 입력된다. 그리하여 상기 도파관 B의 내부를 통해 전파되는 전파는 도파관-동축변환기 C에 의해 전기신호로 변환되고, 마이크로파 집적회로 D에 구비된 고주파 증폭회로부(이하, RF 회로부라 한다) E에서 증폭되며, 증폭된 RF 신호와 국부발진회로 F로부터 출력된 국부발진신호는 혼합회로 G에 의해 혼합되어 중간주파수신호(이하, IF 신호라 한다)로 변환된다. 그리고, 상기 IF 신호는 중간주파신호 H에 의해 증폭된 후, LNB의 출력신호로써 옥내에 설치된 위성방송튜너로 전송된다. 이와 같이, LNB는 SHF 대역의 수진전파를 중간주파대역의 전기신호로 변화하여 위성방송튜너로 전송하는 장치로써, 상기 도파관-동축변환기 C의 끝지점으로부터 λ/4(여기에서, λ는 수신전파의 파장이다) 거리상에서 약 λ/4 길이의 두 수신프로브가 서로 90°의 각을 이루며 형성되는데, 이 두 프로브는 λ/4길이의 마이크로 스트립라인을 인쇄회로기판(PCB)상에 프린트함에 의하여 형성된다.FIG. 7 is a block diagram showing the configuration of an LNB, which is an outdoor device for receiving satellite broadcasting, as an example of a super high frequency (SHF) converter device. In FIG. 7, radio waves transmitted from the broadcast satellites are picked up by the primary radiator A and input to the waveguide B via the linear polarization converter. Thus, the radio wave propagated through the inside of the waveguide B is converted into an electric signal by the waveguide-coaxial converter C, and amplified by the high frequency amplification circuit portion E (hereinafter referred to as an RF circuit portion) E provided in the microwave integrated circuit D. The local oscillation signal output from the RF signal and the local oscillation circuit F are mixed by the mixing circuit G and converted into an intermediate frequency signal (hereinafter referred to as IF signal). The IF signal is amplified by the intermediate frequency signal H and then transmitted to the satellite broadcasting tuner installed indoors as an output signal of the LNB. As such, the LNB is a device for converting the SHF bands into electrical signals of the intermediate frequency band and transmitting them to the satellite broadcasting tuner, wherein λ / 4 (where λ is the received wave from the end of the waveguide-coaxial converter C). The two receiving probes of approximately λ / 4 length are formed at an angle of 90 ° to each other over a distance, and the two probes are formed by printing a λ / 4 length microstripline on a printed circuit board (PCB). Is formed.
제5도에 종래의 LNB 구조를 개략적으로 보인 측단면도를 도시하고 있으며, 제6도에는 제5도에 보인 수직편파프로브(61)와 수평편파프로브(62)가 동일 평면상에 형성된 RF 프린터기판(63)의 정면도를 도시하였다.FIG. 5 is a side cross-sectional view schematically showing a conventional LNB structure, and FIG. 6 shows an RF printer substrate having a vertical polarization probe 61 and a horizontal polarization probe 62 shown in FIG. Front view of (63) is shown.
그런데, 이와 같은 종래의 LNB는 수직편파이프로브(61)와 수평편파프로브(62)가 동일평면상에 위치하고 있기 때문에, 수직편파와 수평편파가 서로간에 간섭을 주어 화질이 저하되는 문제점이 있었다.However, in the conventional LNB, since the vertical polarization probe 61 and the horizontal polarization probe 62 are located on the same plane, there is a problem that the vertical polarization and the horizontal polarization interfere with each other and the image quality is degraded.
[발명이 이루고자 하는 기술적 과제][Technical problem to be achieved]
본 발명은 상기와 같은 문제점을 개선하기 위해 안출된 것으로써, 본 발명의 목적은 서로 90o의 각을 이루는 수직편파프로브와 수평편파프로보를 서로 λ/4 떨어진 다른 평면상에 각각 형성하여 수직편파와 수평편파 상호간의 간섭을 최소화하는 효과가 있는 편파특성을 개선시킨 LNB를 제공하는 것이다.The present invention has been made to solve the above problems, an object of the present invention is to form a vertical polarization probe and a horizontal polarization probe each formed on a different plane λ / 4 apart from each other to form an angle of 90 o It is to provide an LNB with an improved polarization characteristic that has the effect of minimizing interference between the and horizontally polarized waves.
그리고, 본 발명의 또 다른 목적은 수직편파프로브와 수평편파프로브사이에 유전물질을 개재시킴으로써 절연성을 높이는 효과가 있는 편파특성을 개선시킨 LNB를 제공하는 것이다.Another object of the present invention is to provide an LNB having an improved polarization characteristic having an effect of increasing insulation by interposing a dielectric material between the vertically polarized probe and the horizontally polarized probe.
상기와 같은 목적을 달성하기 위한 수단으로써, 본 발명은 전파를 접속하는 피이드혼과, 상기 피이드혼에 연장되며 반사판에 의해 막힌단부를 포함하는 원형도파관과, 고주파증폭기 및 주파수변환기를 이루도록 고주파소자가 장착되고 도전성패턴이 인쇄되는 고주파프린트기판으로 이루어지는 위성방송수신용 저잡음 주파수 변환기에 있어서, 상기 반사판으로부터 λ/4 거리에 위치하며 원형도파관 내부의 고주파프린트기판에 인쇄되는 수평편파프로브와, 상기 수평편파프로브가 인쇄된 고주파프린트기판상에 그 일면이 부착되며 λ/4 두께를 갖는 유전체와, 상기 유전체의 다른면에 상기 수평편파프로브와 90o의 각을 이루도록 형성되며 상기 고주파프린트기판에 형성된 소자와 유전체에 형성된 드루홀을 통해 접속되는 수직편파프로브를 구비함에 의한다.As a means for achieving the above object, the present invention is a high-frequency element to form a feed wave horn for connecting radio waves, a circular waveguide extending to the feed horn and a closed end by a reflecting plate, a high frequency amplifier and a frequency converter; A low noise frequency converter for satellite broadcasting reception, comprising: a high frequency printed board on which a conductive pattern is mounted and printed with a conductive pattern, comprising: a horizontal polarization probe printed at a high frequency printed circuit board in a circular waveguide at a distance of? / 4 from the reflecting plate; One side of the probe is printed on the printed high frequency printed circuit board, the dielectric having a thickness of λ / 4, and formed on the other side of the dielectric so as to form an angle of 90 ° with the horizontal polarized probe, and the element and dielectric formed on the high frequency printed circuit board. With a vertically polarized probe connected through a through hole formed in the By.
[발명의 구성 및 작용][Configuration and Function of Invention]
이하, 본 발명을 첨부한 도면을 참고하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings of the present invention will be described in detail.
제1도는 본 발명에 의한 LNB의 측담녀도로써, 1은 피이드혼이며, 파라볼라안테나(도시생략)의 초점상에 놓여 접속되는 전자파신호를 수신한다. 2는 상기 피이드혼(1)의 연장부로써 단면이 원형으로 된 원형도파관이고, 상기 피이드혼(1)으로 접속된 전파, 즉 수직편파 및 수평편파를 전달한다. 3은 증폭기, 혼합기, 국부발진기등을 이루어는 RF 회로소자들이 장착되고, 도전성패턴이 인쇄된 RF 프린트기판으로, 상기 원형도파관(2)을 통해 전달된 전파를 IF 신호로 변환한다. 4는 외장케이스이며, 내부 부품들을 보호하고, 내부 소자들로부터 발생되는 전자파가 외부로 방사되지 않도록 차단한다. 5는 외장케이스(4)와 같은 알루미늄합금으로된 다이캐스트기판으로, 도시된 바와 같이 원형도파관(2)에 연장되어 반사판(11)에 의해 한 단부가 막힌 도파관(8)을 형성한다. 6은 IF 프린트기판으로 IF 증폭기를 이루는 회로소자가 장착되어 있다. 7은 LNB의 외부카바이며 상기 외장케이스(4)의 연장으로 내부소자들을 보호하고 내부소자들로부터 발생되는 전자파의 외부방출을 차단한다. 22는 수평편자를 수신하는 도전성패턴인 수평편파프로브로 유전체(25)의 저면에 형성되어 있고, 23은 상기 유전체(25)의 상면에 상기 수평편파프로브(22)와 90o의 각을 이루도록 형성된 수직편파프로브이다. 24는 수직편파프로브(23)를 RF 프린트기판(3)에 인쇄된 수직편과 저잡음 증폭기(도시생락)의 입력단에 연결된 도전성패턴(도시생략)과 접속시키기 위한 드루홀(Through Hole)이다.1 is a side view of the LNB according to the present invention, where 1 is a feed horn, and receives an electromagnetic wave signal which is placed on a focal point of a parabola antenna (not shown) and connected. 2 is a circular waveguide having a circular cross section as an extension of the feed horn 1, and transmits radio waves connected to the feed horn 1, that is, vertical polarization and horizontal polarization. 3 is an RF printed circuit board on which RF circuit elements forming an amplifier, a mixer, a local oscillator, etc. are mounted, and a conductive pattern is printed, and converts the radio wave transmitted through the circular waveguide 2 into an IF signal. 4 is an outer case, which protects internal components and blocks electromagnetic waves emitted from internal components from being radiated to the outside. 5 is a die-cast substrate made of an aluminum alloy such as the outer case 4, which extends to the circular waveguide 2 as shown to form a waveguide 8 whose one end is blocked by the reflecting plate 11. 6 is an IF printed circuit board equipped with a circuit element forming an IF amplifier. 7 is an outer cover of the LNB, and the extension of the outer case 4 protects the internal elements and blocks the external emission of electromagnetic waves generated from the internal elements. 22 is a horizontally polarized wave probe which is a conductive pattern for receiving a horizontal horseshoe, and is formed on the bottom surface of the dielectric 25, and 23 is formed to form an angle of 90 ° with the horizontally polarized probe 22 on the top surface of the dielectric 25. Vertically polarized probe. Denoted at 24 is a through hole for connecting the vertically polarized probe 23 with a conductive pattern (not shown) connected to the vertical piece printed on the RF printed board 3 and the input terminal of the low noise amplifier (not shown).
제2도는 본 발명에 의한 RF 프린트기판의 평면도이고, 제3도는 RF 프린트기판의 측단면도로써, 원형도파관(2)의 내부지름보다 약간 작은 지름과 λ/4 두께로 된 원판인 유전체(25)를 원형도파관(2)이 위치하는 RF 프린트기판(3)위에 부착하는데, 상기 유전체(25)의 저면과 상면에는 각각 서로 90o를 이루는 수평편파프로브(22)와 수직편파프로브(23)가 형성된다. 그리고, 유전체(25)의 상면에 형성된 수직편파프로브(23)는 드루홀(24)를 통해 RF 프린트기판(3)상에 인쇄된 도전성패턴(27)에 연결되며, 수평편파프로브(22)는 납땜에 의하여 직접 도전성패턴(26)과 연결된다.FIG. 2 is a plan view of the RF printed board according to the present invention, and FIG. 3 is a side cross-sectional view of the RF printed board. The dielectric 25 is a disk having a diameter and lambda / 4 thickness slightly smaller than the inner diameter of the circular waveguide 2; a circular waveguide (2) is located RF printed circuit board (3) to attach over the bottom face and the top surface, each with 90 o to the horizontal polarized wave probe 22 and the vertically polarized wave probe 23 forming the dielectric 25, which is formed do. The vertical polarization probe 23 formed on the upper surface of the dielectric 25 is connected to the conductive pattern 27 printed on the RF printed board 3 through the through hole 24, and the horizontal polarization probe 22 is Directly connected to the conductive pattern 26 by soldering.
제4도는 본 발명의 다른 실시예에 의한 RF 프린트기판의 측단면도로써, RF 프린트기판(3)상에 λ/4 두께의 원판인 유전체(25)가 부착되고, 상기 RF 프린트기판(3)의 다른면에 수평편파프로브(22)가 형성되고, 상기 수평편파프로브(22)는 RF 프린트기판(3)을 관통하는 드루홀(30)에 의하여 RF 프린트기판(3)의 다른면에 장착된 소자들과 접속되고, 상기 유전체(23)의 상면에는 상기 수평편파프로브(22)와 90o의 각을 이루는 수직편파프로브(23)가 형성되고, 이 수직편파프로브(23)는 드루홀(24)를 통해 RF 프린트기판(3)상에 인쇄된 도전성패턴(27)에 연결된다.4 is a side cross-sectional view of an RF printed board according to another embodiment of the present invention, in which a dielectric 25, which is a λ / 4 thick plate, is attached to the RF printed board 3, and the RF printed board 3 of FIG. A horizontal polarization probe 22 is formed on the other side, and the horizontal polarization probe 22 is mounted on the other side of the RF printed board 3 by a through hole 30 penetrating the RF printed board 3. And a vertical polarization probe 23 formed at an upper surface of the dielectric 23 to form an angle of 90 ° with the horizontal polarization probe 22, and the vertical polarization probe 23 is a through hole 24. It is connected to the conductive pattern 27 printed on the RF printed board (3) through.
상기와 같이 구성된 본 발명의 동작을 설명하면 다음과 같다.Referring to the operation of the present invention configured as described above are as follows.
제1도 및 제2도에 도시된 바와같이 수평편파프로브(22)는 원형도파관(2)의 막힌단부를 이루는 도파관(8)의 밑면인 반사판(11)과 λ/4거리에 위치해 있기 때문에 수평편파프로브(22)를 그냥 통과한 수평편파는 반사판(11)에서 반사되어 수평편파프로브(22)에 수신된다. 상기 반사판(11)에 의하여 반사되어 수평편파프로브(22)에 수신된 수평편파와 직접 수신된 수평편파는 180˚의 위상차를 갖게 된다.As shown in FIGS. 1 and 2, the horizontally polarized wave probe 22 is horizontal because it is located at a distance of? / 4 from the reflecting plate 11, which is the bottom of the waveguide 8, which forms a closed end of the circular waveguide 2. The horizontally polarized wave that just passed through the polarized probe 22 is reflected by the reflecting plate 11 and received by the horizontally polarized probe 22. The horizontal polarization reflected by the reflector 11 and received by the horizontal polarization probe 22 and the horizontal polarization directly received have a phase difference of 180 °.
그리고, 수직편파는 수평편파프로브(22)와 수직으로 만나거나 그냥 통과하므로 수평편파 프로브(22)에는 영향을 미치지 못한다.The vertical polarization does not affect the horizontal polarization probe 22 because it vertically meets or just passes through the horizontal polarization probe 22.
수직편파프로브(23)은 유전체(25)(본 실시예에서는 FR4 프린트기판을 사용하지만 이것에 한하지 않고 다른 유전체의 사용도 가능하다)를 사이에 두고 수평편파프로브(22)와 λ/4 거리에 설치된다(제3도 참조).The vertically polarized probe 23 has a λ / 4 distance from the horizontally polarized probe 22 with a dielectric 25 (in this embodiment, FR4 printed circuit boards are used, but other dielectrics may be used). It is installed at (see Figure 3).
수직편파프로브(23)는 원형도파관(2)의 막힌단부를 이루는 반사판(11)과 λ/2의 거리에 위치해 있으므로 수직편파프로브(23)와 평행으로 전계의 세기가 변화하면서 진행하는 수직편파는 일차로 수직편파프로브(23)에 수신되고, 나머지는 반사판(11)에 부딪쳐 위상이 180˚반전되어 전계의 세기가 가장 큰 편파부분이 수직편파프로브(23)로 수신된다. 이때 수평편파프로브(22)는 수직편파와 수직관계에 있고 수직편파의 전계의 세기가 제일 약한 부분에 있기 때문에 수직편파의 영향을 받지 않는다.Since the vertically polarized probe 23 is located at a distance of λ / 2 from the reflecting plate 11 forming the blind end of the circular waveguide 2, the vertically polarized wave traveling while the intensity of the electric field is changed in parallel with the vertically polarized probe 23 is Firstly, it is received by the vertically polarized probe 23, the rest hits the reflecting plate 11, and the phase is reversed 180 degrees so that the polarized portion having the largest electric field is received by the vertically polarized probe 23. At this time, the horizontal polarization probe 22 is not affected by the vertical polarization because the horizontal polarization probe 22 is in a vertical relationship with the vertical polarization and the electric field strength of the vertical polarization is at the weakest portion.
또 다른 실시예로써 제4도에 도시된 바와 같이 수평편파프로브(22)를 RF 프린트기판(3)의 이면에 설치할 수도 있으며, 이때에는 드루홀(30)에 의해 프린트기판(3)의 윗면에 장착된 소자와 전기적으로 접속될 수 있다. 이때에도 수직편파프로브(23)와 수평편파프로브(23)가 λ/4의 거리를 가진다.As another example, as shown in FIG. 4, the horizontal polarization probe 22 may be installed on the rear surface of the RF printed board 3, in which case, the through hole 30 is provided on the upper surface of the printed board 3. It can be electrically connected to the mounted element. At this time, the vertical polarization probe 23 and the horizontal polarization probe 23 have a distance of λ / 4.
[발명의 효과][Effects of the Invention]
이상 설명한 바와 같이 본 발명에 의한 장치는 수평편파프로브와 수직편파프로브를 λ/4 떨어진 평면상에 각각 형성하였기 때문에 수직편파프로브와 수평편파프로브간의 간섭영향이 최소화되는 효과가 있으며, 또한 본 발명에 의한 장치는 수직편파프로브와 수평편파프로브사이에 유전체를 개재시킴으로써 절연성을 높이는 우수한 효과가 있는 것이다.As described above, the apparatus according to the present invention has the effect of minimizing the interference effect between the vertically polarized probe and the horizontally polarized probe because the horizontally polarized probe and the vertically polarized probe are each formed on a plane separated by λ / 4. The device has an excellent effect of increasing insulation by interposing a dielectric between the vertically polarized probe and the horizontally polarized probe.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940014635A KR970004856B1 (en) | 1994-06-24 | 1994-06-24 | Low noise frequency converter (LNB) with improved polarization characteristics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940014635A KR970004856B1 (en) | 1994-06-24 | 1994-06-24 | Low noise frequency converter (LNB) with improved polarization characteristics |
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| Publication Number | Publication Date |
|---|---|
| KR960002942A KR960002942A (en) | 1996-01-26 |
| KR970004856B1 true KR970004856B1 (en) | 1997-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019940014635A Expired - Fee Related KR970004856B1 (en) | 1994-06-24 | 1994-06-24 | Low noise frequency converter (LNB) with improved polarization characteristics |
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| KR (1) | KR970004856B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7698144B2 (en) | 2006-01-11 | 2010-04-13 | Microsoft Corporation | Automated audio sub-band comparison |
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1994
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7698144B2 (en) | 2006-01-11 | 2010-04-13 | Microsoft Corporation | Automated audio sub-band comparison |
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| KR960002942A (en) | 1996-01-26 |
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