KR20070064552A - Ｆｆｔ 기반의 멀티채널 비디오 수신기 - Google Patents

Ｆｆｔ 기반의 멀티채널 비디오 수신기 Download PDF

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Publication number
KR20070064552A
KR20070064552A KR1020067022710A KR20067022710A KR20070064552A KR 20070064552 A KR20070064552 A KR 20070064552A KR 1020067022710 A KR1020067022710 A KR 1020067022710A KR 20067022710 A KR20067022710 A KR 20067022710A KR 20070064552 A KR20070064552 A KR 20070064552A
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South Korea
Prior art keywords
circuit
frequency
representation
digitized
generating
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KR1020067022710A
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English (en)
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KR101110746B1 (ko
Inventor
웨이지 윤
사무엘 쎙
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텔레전트 시스템즈, 인크.
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Publication of KR20070064552A publication Critical patent/KR20070064552A/ko
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Publication of KR101110746B1 publication Critical patent/KR101110746B1/ko

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems
    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
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    • G01S1/026—Means for monitoring or calibrating of associated receivers
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    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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Abstract

아날로그-디지털 전송기, 고속 퓨리에 변환 회로 및 역 퓨리에 변환 회로를 갖는 멀티채널 비디오 수신기. 상기 아날로그-디지털 변환기 회로는 복수의 비디오 신호들을 전송하기 위해 사용되는 주파수 밴드에 대한 디지털화된 표현을 생성하며, 상기 고속 퓨리에 변환 회로는 상기 디지털화된 주파수 밴드에 대한 주파수 영역 표현을 생성한다. 상기 역 퓨리에 변환 회로는 상기 복수의 비디오 신호들에 대응되는 복수의 디지털화된 시간 영역 신호들을 상기 주파수 영역 표현으로부터 복구한다.

Description

ＦＦＴ 기반의 멀티채널 비디오 수신기{FFT-BASED MULTICHANNEL VIDEO RECEIVER}
본 출원은 "FFT-BASED MULTICHANNEL TUNER/DECODER ARCHITECTURE"의 제목으로 2004년 4월 30일에 출원된 미국 가출원 NO. 60/567/333로부터의 우선권을 주장한다.
본 발명은 비디오 수신 분야에 관련된다.
역사적으로, 비디오 밴드 응용들을 위한 튜너 복조기들("tuner cans")은 오로지 최대 수백개까지의 서로 흩어져 있는 구성요소들을 사용하며 2 에서 3 와트 정도의 전력을 소비하는 아날로그 영역에서만 사용되어져 왔었다. 불행히도, 그러한 저가이면서 탄탄한 동작환경(robust performance)에도 불구하고, 튜너 캔들은 일반적으로 단일 채널 선택에 한정되며 이에 따라 전형적으로 하나 이상의 비디오 채널에 대한 동시 수신을 필요로 하는 응용들에서 중복되어지며, 따라서 동시에 수신되어지는 채널들의 수에 의해 요구되는 구성요소들의 수를 증가시키고, 그 결과 파워 및 공간의 소비를 발생시키게 된다.
본 발명은 한정하는 것이 아닌 실시예로서 첨부된 도면들을 가지고 설명되며, 같은 참조번호는 유사한 구성요소를 의미한다.
도 1은 일 실시예에 따른 FFT 기반의 멀티채널 비디오 수신기 구조를 나타내는 도면.
도 2는 도 1의 멀티채널 비디오 수신기 내에서 사용될 수 있는 베이스밴드 처리 회로의 일 실시예를 나타내는 도면.
도 3a 및 도 3b는 도 1 또는 도 2의 베이스밴드 처리 회로 내에 포함될 수 있는 예시적인 디코더들을 나타내는 도면.
본 발명의 멀티채널 비디오 수신기는 복수의 비디오 신호들을 전송하기 위해 사용되는 주파수 대역의 디지털화된 표현을 생성하는 아날로그-디지털 변환기 회로; 상기 주파수 대역의 디지털화된 표현에 대한 주파수 영역 표현을 생성하는 고속 퓨리에 변환 회로; 및 상기 복수의 비디오 신호들에 대응되는 복수의 디지털화된 시간 영역 비디오 신호들을 상기 주파수 영역 표현으로부터 복구하는 역 퓨리에 변환 회로를 포함한다.
다음의 설명 및 첨부된 도면들에 있어서, 특정 용어 및 도면 기호들은 본 발명에 대한 완전한 이해를 제공하기 위해 정해졌다. 일부 사례에 있어서, 용어 및 기호들은 발명을 실제 실행하는데 필요하지 않은 특정 세부사항들을 의미할 수 있다. 예컨대, 회로 소자들 또는 회로 블럭들 사이의 상호연결은 멀티 컨덕터 또는 싱글 컨덕터 싱글 라인들로서 도시되거나 설명될 수 있다. 각 멀티 컨덕터 싱글 라인들은 선택적으로 싱글 컨덕터 싱글 라인들이 될 수 있으며, 각 싱글 컨덕터 싱글 라인들은 선택적으로 멀티 컨덕터 싱글 라인들이 될 수 있다. 싱글 엔디드(single-ended)로서 도시되거나 설명되어진 신호들 및 신호 경로들은 차동신호 일 수 있으며, 그리고 그 반대일 수도 있다. 신호 구동 회로가 신호 구동 회로와 신호 수신 회로 사이에 연결된 신호선 상에 신호를 어저트(assert)할 때(또는 만약 전후 관계에 의해 명백하게 언급되거나 암시되어 진다면, 디어저트(deassert) 할 때) 신호 구동 회로는 그 신호를 신호 수신 회로로 "출력"한다고 일컬어진다. "연결된(coupled)"이라는 용어는 여기에서 하나 이상의 중개회로들 또는 구조들을 통해 연결되는 것 뿐만 아니라 직접 연결된 것을 나타낼 때 사용된다. "예시적인(exemplary)"이라는 용어는 여기에서 선호하거나 필수적인 것을 나타내는 것이 아니라 하나의 예시를 나타내는데 사용된다.
다수의 비디오 채널들을 동시에 복조하기 위해 단일 집적 회로(예컨대, 단일 칩) 형태로 구현될 수 있으며 디지털 신호 처리 기술들을 채용하는 비디오 수신기 구조들이 여기에서 다양한 실시예들로 개시된다. 어느 한 멀티채널 수신기에 대한 실시예로서, 예컨대, 어떤 집적된 튜너 또는 복조기는 전반적인 튜너 성능을 유지하면서 아날로그 영역에서의 성능 요구들을 경감시키는 것을 본질적인 목표로 하는 디지털 신호 처리를 채용하고 있으며, 그것에 의해 다이(die) 면적과 전력 소비 규모가 단지 N으로 약화되는 N개의 병렬된 튜너 캔들과 동일한 성능을 제공하게 된다.
도 1은 신호 입력(101), 고 동작범위(dynamic-range) 저잡음 증폭기(103), 아날로그-디지털 변환기(ADC) 뱅크(105), 고속 퓨리에 변환(FFT) 엔진(107), 보간된 주파수 보정 회로(IFC)(109), 역 퓨리에 변환 뱅크(111), 베이스밴드 처리 뱅크(113), 합성기(synthesizer)(115), 전압 제어 발진기(voltage controlled oscillator)(117), 위상 제어 회로(119) 및 파일럿 추출 회로(121)를 포함하는 멀티채널 비디오 수신기의 일 실시예를 설명하며, 이것들 중 일부 또는 전부는 여기에서 호스트 IC로 언급되는 단일 집적 회로(IC) 소자로 집적될 수 있다. 호스트 IC는 단일 IC 다이 또는 두 개 이상의 다이를 포함하는 IC 패키지(예컨대, 멀티칩 모듈) 일 수 있다. 또한 호스트 IC는 그 자체가 멀티채널 비디오 수신이 바람직한 텔레비전 세트들, 비디오 리코더들, 이동 전화기들, 개인 컴퓨터들, 개인 디지털 보조물들(PDAs), 비디오 플레이어들, 셋탑 박스들, 또는 다른 기기들(이에 한정되지 않음)을 포함하는 다수의 호스트 시스템들의 어느 한 구성요소일 수 있다. 그 호스트 시스템은 비디오 수신기(100)에 의해 복구된 하나 이상의 비디오 신호들을 디스플레이하기 위한 디스플레이, 하나 이상의 비디오 신호들을 기록하기 위한 리코딩 매체 및 비디오 수신기(100)에 의해 복구된 하나 이상의 오디오 신호들에 대한 가청 출력을 생성하기 위한 오디오 변환기 뿐만 아니라 사용자 공급 채널 선택들, 구성 정보 등을 수신하기 위한 다양한 형태의 사용자 인터페이스를 포함할 수 있다.
신호 입력(101)(예컨대, 케이블 또는 다른 전기적 또는 광학적 도전체를 수용하기 위한 안테나 또는 잭)을 통해 수신된 신호는 저잡음 증폭기(103)에 의해 증폭되어 하향 회로 블럭들에서 디지털화되고 처리될 수 있는 입력 비디오 신호로 제공된다. 일 실시예에 있어서, 선택적인 실시예로서 비록 실제 어느 주파수 대역이 증폭기의 범위(예컨대, 50 MHz - 1 GHz의 케이블 스펙트럼 또는 어느 다른 스펙트럼) 내에 포함되어 질 수 있다고 하더라도, 저잡음 증폭기(103)는 비디오 주파수 대역(예컨대, 50 - 850 MHz) 내로 떨어진 신호들을 증폭하도록 설계된다. 증폭기(103)의 출력에서, 파일럿 톤(증폭된 주파수 대역에 대해 대역 외(out-of-band)에 있으며 또는 잠재적으로 대역 내(in-band)에 있음)이 증폭된 신호로 주입된다. 증폭된 수신 신호(즉, 증폭기(103)의 출력)는 파일럿과 함께 ADC 뱅크(105)에 의해 디지털 영역으로 변환된다. 보여진 실시예에 있어서, ADC 뱅크(105)는 유효 샘플링 레이트인 K의 배수로 샘플링 클럭 주파수를 제공하기 위해 시간 엇갈림(time-staggered) 된 한 세트의 샘플링 클럭 신호들(120)(즉, 다중 위상 클럭 신호)에 의해 트리거되는 한 세트의 K개의 M 비트 해상도(resolution) ADC들(ADC1 - ADCK)을 포함한다. 특정된 실시예에 있어서, 예컨대, ADC 뱅크(105)는 2GHz의 유효 샘플링 레이트를 제공하기 위해 개개의 시간 엇갈림(respective time-staggered) 된 250 MHz 샘플링 클럭 신호에 의해 각각이 트리거되는 8개의 10비트 ADC들을 포함한다. ADC 뱅크(105) 내의 구성요소 ADC들 사이의 상대적 시간 위상(time-phasing)을 보정하기 위해서 뿐만 아니라 ADC 뱅크(105) 내의 구성요소 ADC들 사이의 매칭을 강화하기 위해서 배경 조정(background calibration)이 사용될 수 있다(예컨대, 사인파 형태의 파일럿 톤 또는 의사잡음 배열(pseudo-noise sequence)).
ADC 뱅크(105)의 출력은 예컨대 수신된 신호 및 파일럿 톤에 대한 등가의 주파수 영역 표현을 생성하기 위해 오버랩/에드 타입의 FFT 동작을 실행하는 FFT 엔진(107)에 공급된다. 예컨대, 수신된 신호가 원하는 주파수 대역의 상위 경계 및 하위 경계 사이의 모든 비디오 채널들(예컨대 50 MHz와 850 MHz 사이의 모든 6 MHz 비디오 채널들)을 포함한다고 가정하면, FFT의 각 "빈(bin)"에 있는 정보(즉, 각 분광 오프셋(spectral offset)으로 존재하는 정보관련(information-bearing) 신호)는 각 비디오 채널 자체의 데이터에 대한 표현(representation)으로서 보여질 수 있다. 또한, FFT과 비디오 채널들 그 자신들은 모두 주파수로 분리되어 있기 때문에(즉, FFT의 직교적 특성), 각 개별 비디오 채널에 관하여 ADC 뱅크(105)의 유효 동작범위는 일반적으로 ADC 출력의 M 비트 해상도 보다 훨씬 크다. 표준 6 MHz 비디오 채널이 엄청난 오버샘플링 레이트를 야기하는 경우에 있어서, 250 MHz 샘플링 클럭으로 계속해서, 예를 들면, 위에서 예시한 8-ADC에서, 관심있는 비디오 밴드 내에 있는 각 비디오 채널은 2 GHz로 효과적으로 샘플링된다. FFT는 오버샘플링 이득(gain)이 실현됨으로써 평균화되며 이에 따라 각 개별 채널에 대한 신호대잡음비(SNR)가 증가한다.
ADC 뱅크(105)의 파일럿 톤 조정에 관하여, 일 실시예로서 원하는 비디오 밴드를 벗어나는 주파수(예컨대, 1 GHz 또는 그 이상)를 갖는 단일 사인파 형태의 파일럿(118)이 증폭된 수신 신호(즉, ADC 뱅크의 입력)로 주입된다. 파일럿 톤(118)은 일정한 주파수 및 진폭을 갖기 때문에, FFT 엔진(107)은 파일럿 톤의 주파수로 일정한 출력을 생성하게 된다. 즉, 파일럿 톤의 "빈(bin)"에 있는 데이터는 실질적으로 시간에 대해 변화하지 않고 유지된다. 따라서, ADC 뱅크(105)를 구성하는 개별 ADC들 사이의 상대적인 타이밍에 있어서의 위상 잡음 또는 오류 때문에, 파일럿 추출 회로(121)에서 검출된 파일럿 톤의 빈에 대한 어떤 변조 또는 오류는 샘플링 동작 자체에서의 불완전성을 나타내게 된다. 따라서, FFT 엔진에 의해 생성된 FFT로 파일럿을 측정함으로써, 파일럿 추출 회로(121)는 VCO의 주파수 및/또는 ADC 뱅크(105) 내에 있는 ADC들의 위상을 조정하여 향상된 성능을 얻을 수 있으며, 그에 따라 구성요소 ADC들 그 자신들 내에 있는 동작 변수(예컨대, 공정, 온도, 전압 등)들에 대해 보상해줄 뿐 아니라 샘플링 클럭 신호들(120)에서의 위상 잡음을 경감시키게 된다.
또한 최종 주파수 조정이 주파수 영역에서 수행되어 질 수 있다. 예컨대, 보간 주파수 보정 회로(109)에서 주파수 영역 보간을 수행함으로써, 유효 복조 캐리어 주파수는 비디오 전송들을 복조하기 위해 요구되는 오차 허용 한계(예컨대, NTSC 표준 비디오 전송에 있어서 50 KHz)에 부합되도록 조정될 수 있다. 더욱이, 시간 영역 시스템들에 있어서 아날로그 혼합 단계들에서 관습적으로 수행되었던 복조 동작들이 도 1의 실시예에 있어서는 (디지털)주파수 영역에서 간단한 디지털 이동 동작을 사용하여 수행되어질 수 있도록 전체적인 캐리어-베이스밴드(carrier-to-baseband) 동작이 주파수 영역에서 수행되어 질 수 있다.
회로(109)에서의 주파수 보정 및 채널 선택 이후, 원하는 한 세트의 채널 신호에 대한 비디오 신호들은 예컨대 IDFT 뱅크(111)의 구성요소 IDFT 회로들에서 실행되는 역FFT(IDFT) 동작을 통해 시간 영역으로 다시 변환된다. 비디오 정보를 추출하기 위해 원하는 이제 베이스밴드에 있는 비디오 신호들은 베이스밴드 처리 뱅크(113)의 각 베이스밴드 처리 회로들 내에서 시간 영역에서 더 처리될 수 있다. 도 2에 보여진 베이스밴드 처리 회로들의 실시예(도 1의 뱅크(113) 내에 있는 어느 베이스밴드 처리 회로들을 실행시키기 위해 사용되어질 수 있는)를 참조하면, 어느 잔류 주파수 오류는 혼합 동작에 의해 야기된 고주파수 성분들을 제거하기 위해 저역필터(153)에서 필터링된 보정 신호를 가지고 예컨대 직접 디지털 합성기/믹서(direct-digital synthesizer/mixer)(151)(DDS)에서 보정될 수 있다. 만약 분리된 오디오 서브캐리어가 존재한다면, 비디오 출력 및 오디오 출력을 복구하기 위해 그 결과로 얻어진 베이스밴드 신호는 다음에 서브캐리어 분리 회로(155)로 공급된다. 보다 구체적으로, 그 비디오 정보를 디코드하기 하기 위해 적절한 비디오 디코더가 서브캐리어 분리 회로(155) 내에 적용될 수 있다. 예컨대, 표준 북미 텔레비전 신호를 디코드하기 위해 NTSC(National Television Standards Committee) 디코더가 적용될 수 있으며, 북미 고선명 텔레비전(HDTV) 신호를 위해서는 도 3a에 도시된 것과 같은 ATSC(Advanced Television Standards Committee) 8-VSB 디코더가 적용될 수 있으며, 또는 유럽 디지털 텔레비전 방송을 위해서는 도 3b에 도시된 것과 같은 DVB-T/H(Digital Video Broadcast, Terrestrial/Handheld) COFDM 디코더가 적용될 수 있다. PAL(Phase Alternating Line) 또는 SECAM(Sequential Color Memory)와 같은 다른 종래의 비디오 표준들 그리고 다양한 다른 고선명 비디오 표준들에 맞춰 전송되는 비디오 정보를 디코드하기 위해 다른 비디오 디코더들이 적용될 수 있다.
최종 비디오 출력은 비디오 디스플레이 및/또는 MPEG(Moving Picture Expert Group) 디코더로 공급될 수 있는 디지털 스트림이다. 디지털 스트림은 많은 산업 표준들(예컨대, CCIR/ITU 601/656 또는 SPI)을 따를 수 있다.
FFT 엔진, 보간 주파수 보정 회로, IDFT 회로, DDS 주파수 보정 회로, 채널 선택 필터, 서브캐리어 분리 회로, 및 그곳에 있는 어떤 MPEG 디코딩의 기능들(이에 한정되지 않음)을 포함하는 상술된 디지털 처리 기능들에 대한 기능들 또는 그것들의 어떤 부분집합(subset)들을 수행하기 위해 프로그램된 처리장치가 사용될 수 있음을 명심해야 한다. 처리장치는 비디오 수신기와 함께 집적회로 상에 형성되거나 동일한 또는 서로 다른 집적회로 패키지에 있는 분리된 집적회로 다이 상에 형성될 수 있다. 처리장치는 일반 목적의 처리장치 또는 특별한 목적의 처리장치(예컨대, 집적된 ADC 뱅크를 포함할 수 있는 마이크로 컨트롤러, 디지털신호 처리장치(DSP) 등)(이에 한정되지 않음)를 포함하는 실질적으로 어떠한 타입의 처리장치일 수 있으며, 상술된 기능들을 수행하기 위해 처리장치에 의해 실행되는 프로그램 코드를 저장하기 위한 내부 프로그램 저장수단을 포함할 수 있다. 선택적으로, 분리된 온칩(on-chip) 또는 오프칩(off-chip) 프로그램 저장수단(예컨대, 도시되지 않은 휘발성 또는 비휘발성 메모리, 또는 어느 다른 처리장치 또는 반도체 메모리 및 마그네틱 및/또는 광학적 매체(이에 한정되지 않음)를 포함하는 컴퓨터로 판독가능한 매체)가 제공되어 예컨대 전용 버스 또는 공용 버스를 통해 처리장치에 연결될 수 있다. 프로그램 저장수단 내에 저장된 프로그램 코드는 처리장치에 의해 실행되어 질 때 처리장치가 상술된 기능들을 수행할 수 있도록 해주는 명령어들 및/또는 데이터를 포함할 수 있다.
여기에서 개시된 다양한 회로들은 그들의 행동, 레지스터 전송, 논리적 성분, 트랜지스터, 설계된 기하학적 구조들, 및/또는 다른 특성들의 견지에서 다양한 컴퓨터 판독 매체에 일체화된 데이터 및/또는 명령어들로서 컴퓨터 지원 설계(computer aided design) 툴들을 사용하여 설명되어 질 수 있으며 수식화(표현)될 수 있다. 그러한 회로적 표현들이 실행될 수 있는 파일들 및 다른 객체(object)들에 대한 포맷들은 C, 배릴로그(Verilog) 및 HLDL과 같은 행동적 언어들(behavioral languages)을 지원하는 포맷들, RTL과 같은 레지스터 레벨의 묘사 언어들을 지원하는 포맷들, 및 GDSⅡ, GDSⅢ, GDSⅣ, CIF, MEBES와 같은 형태 묘사 언어들을 지원하는 포맷들 및 어느 다른 적절한 포맷들과 언어들(그러나 이에 한정되지 않음)을 포함한다. 그렇게 포맷된 데이터 및/또는 명령어들이 일체화될 수 있는 컴퓨터 판독 매체는 다양한 형태의 비휘발성 저장 매체(예컨대, 광, 마그네틱 또는 반도체 저장 매체) 및 그렇게 포맷된 데이터 및/또는 명령어들을 무선, 광, 또는 유선 신호 매체 또는 그것들의 어느 조합을 통해 전송하기 위해 사용될 수 있는 반송파들(그러나 이에 한정되지 않음)을 포함한다. 그렇게 포맷된 데이터 및/또는 명령어들에 대한 반송파들에 의한 전송 예들로는 하나 이상의 데이터 전송 프로토콜(예컨대, HTTP, FTP, SMTP 등)을 통한 인터넷 및/또는 다른 컴퓨터 네트웍 상으로의 전송(업로드, 다운로드, 이메일 등)(그러나 이에 한정되지 않음)을 포함한다.
상술된 회로들의 그러한 데이터 및/또는 명령어 기반의 표현들이 하나 이상의 컴퓨터 판독 매체를 통해 컴퓨터 시스템 내에 수신될 때, 그러한 회로들의 물리적 표시에 대한 표현 또는 이미지를 생성하기 위해 상술된 회로들의 그러한 데이터 및/또는 명령어 기반의 표현들은 넷리스트(net-list) 생성 프로그램들, 플레이스 앤 라우트(place and route) 프로그램들 등(이에 한정되지 않음)을 포함하는 하나 이상의 다른 컴퓨터 프로그램들의 실행과 협력하는 컴퓨터 시스템 내에 있는 처리 실체(예컨대, 하나 이상의 처리장치들)에 의해 처리될 수 있다. 그 후 그러한 표현 또는 이미지는 예컨대 소자 제조 공정에서 회로들의 다양한 성분들을 구성하기 위해 사용되는 하나 이상의 마스크들의 생성을 가능케 함으로써 소자 제조에 사용될 수 있다.
비록 본 발명은 특정된 실시예들을 참조하여 설명되었지만, 발명에 대한 폭넓은 사상 및 범위에서 벗어남 없이 다양하게 변형 및 변화될 수 있음은 자명하다. 따라서, 명세서 및 도면들은 제한된 의미라기 보다는 예시된 것으로 간주되어야 한다. 여기에서 참조된 어는 문서의 조항들이 여기에 있는 동일 또는 유사한 조항과 서로 모순되거나 또는 그 반대로 서로 일치하지 않는 것으로 판명되는 경우에 있어서, 여기에 있는 그 조항들은 적어도 첨부된 청구항들을 해석하기 위한 목적으로 조절될 수 있다.
본 발명의 멀티채널 비디오 수신기는 단일 집적 회로로 구현되어 다수의 비디오 채널들을 동시에 복조할 수 있다.

Claims (20)

  1. 복수의 비디오 신호들을 전송하기 위해 사용되는 주파수 대역의 디지털화된 표현을 생성하는 아날로그-디지털 변환기 회로;
    상기 주파수 대역의 디지털화된 표현에 대한 주파수 영역 표현을 생성하는 고속 퓨리에 변환 회로; 및
    상기 복수의 비디오 신호들에 대응되는 복수의 디지털화된 시간 영역 비디오 신호들을 상기 주파수 영역 표현으로부터 복구하는 역 퓨리에 변환 회로를 포함하는 멀티채널 비디오 수신기.
  2. 제 1항에 있어서, 상기 아날로그-디지털 변환기(ADC) 회로는
    들어오는 비디오 밴드 신호의 각각의 디지털 샘플들을 생성하는 복수의 구성요소 ADC 회로들을 포함하는 멀티채널 비디오 수신기.
  3. 제 2항에 있어서,
    상기 복수의 구성요소 ADC 회로들 내에서의 각각의 샘플링 동작들을 트리거하는 복수의 샘플링 클럭 신호들을 생성하는 클럭 생성 회로를 더 포함하는 멀티채널 비디오 수신기.
  4. 제 3항에 있어서, 상기 클럭 생성 회로는
    각각의 상기 샘플링 클럭 신호들이 상대적으로 서로 위상 엇갈림(phase-stagger) 되도록 해주는 위상 제어 회로를 포함하는 멀티채널 비디오 수신기.
  5. 제 1항에 있어서,
    실질적으로 고정된 주파수의 파일럿 신호를 생성하기 위한 파일럿 톤 생성기를 더 구비하며, 상기 파일럿 톤 생성기는 상기 파일럿 신호를 상기 아날로그-디지털 변환기에 제공하도록 연결되는 멀티채널 비디오 수신기.
  6. 제 5항에 있어서,
    상기 아날로그-디지털 변환기는 상기 파일럿 톤의 디지털화된 표현을 생성하도록 구성되며, 상기 고속 퓨리에 변환 회로는 상기 파일럿 톤의 디지털화된 표현에 대한 주파수 영역 표현을 생성하도록 구성되며, 상기 멀티채널 수신기는 상기 파일럿 톤의 디지털화된 표현에 대한 주파수 영역 표현에서 적어도 하나의 위상 오류 및 주파수 오류를 검출하기 위한 파일럿 추출 회로를 더 포함하는 멀티채널 비디오 수신기.
  7. 제 6항에 있어서,
    상기 파일럿 추출 회로에 의해 신호화된 위상 오류에 근거하여, 상기 아날로그-디지털 변환기 회로로 공급되는 샘플링 클럭 신호의 위상을 조절하기 위한 위상 제어 회로를 더 포함하는 멀티채널 비디오 수신기.
  8. 제 6항에 있어서,
    상기 파일럿 추출 회로에 의해 신호화된 주파수 오류에 근거하여, 상기 아날로그-디지털 변환기 회로로 공급되는 샘플링 클럭 신호의 주파수를 조절하기 위한 전압 제어 발진기를 더 포함하는 멀티채널 비디오 수신기.
  9. 제 1항에 있어서,
    상기 복수의 디지털화된 시간 영역 비디오 신호들 중 어느 하나에 대응되는 비디오 출력 신호를 생성하기 위한 베이스밴드 처리 회로를 더 포함하는 멀티채널 비디오 수신기.
  10. 제 9항에 있어서, 상기 베이스밴드 처리 회로는
    상기 복수의 디지털화된 시간 영역 비디오 신호들 중 어느 하나의 주파수를 조절하기 위한 혼합기 회로를 포함하는 멀티채널 비디오 수신기.
  11. 제 9항에 있어서, 상기 베이스밴드 처리 회로는
    상기 복수의 디지털화된 시간 영역 비디오 신호들 중 어느 하나로 전송되는 오디오 및 비디오 정보를 분리하기 위한 서브캐리어 분리 회로를 포함하는 멀티채널 비디오 수신기.
  12. 제 9항에 있어서, 상기 베이스밴드 처리 회로는
    MPEG 디코더를 포함하는 멀티채널 비디오 수신기.
  13. 복수의 비디오 신호들을 전송하기 위해 사용되는 주파수 대역의 디지털화된 표현을 생성하는 단계;
    상기 주파수 밴드의 디지털화된 표현에 대한 주파수 영역 표현을 생성하기 위해 상기 주파수 대역의 디지털화된 표현을 고속 퓨리에 변환 동작으로 변환하는 단계; 및
    상기 복수의 비디오 신호들에 대응되는 복수의 디지털화된 시간 영역 신호들을 생성하기 위해 상기 주파수 영역 표현을 역 퓨리에 변환 동작으로 변환하는 단계를 포함하는 멀티채널 비디오 수신기에서의 동작 방법.
  14. 제 13항에 있어서,
    복수의 비디오 신호들을 전송하기 위해 사용되는 주파수 대역의 디지털화된 표현을 생성하는 단계는 수신된 신호를 다중 위상 샘플링 클럭 신호에 대응되게 샘플링하는 것을 특징으로 하는 멀티채널 비디오 수신기에서의 동작 방법.
  15. 제 13항에 있어서,
    실질적으로 고정된 주파수의 파일럿 신호를 생성하는 단계;
    상기 파일럿 신호의 디지털화된 표현을 생성하기 위해 상기 파일럿 신호를 상기 다중 위상 샘플링 클럭 신호에 대응되게 샘플링하는 단계; 및
    상기 파일럿 신호의 주파수 영역 표현을 생성하기 위해 상기 파일럿 신호의 상기 디지털화된 표현을 고속 퓨리에 변환 동작으로 변환하는 단계를 더 포함하는 멀티채널 비디오 수신기에서의 동작 방법.
  16. 제 15항에 있어서,
    상기 파일럿 신호의 주파수 영역 표현에 의해 지시되는 위상 오류에 따라 상기 다중 위상 샘플링 클럭 신호의 위상을 조절하는 단계를 더 포함하는 멀티채널 비디오 수신기에서의 동작 방법.
  17. 제 15항에 있어서,
    상기 파일럿 신호의 주파수 영역 표현에 의해 지시되는 주파수 오류에 따라 상기 다중 위상 샘플링 클럭 신호의 주파수를 조절하는 단계를 더 포함하는 멀티채널 비디오 수신기에서의 동작 방법.
  18. 제 13항에 있어서,
    상기 복수의 디지털화된 시간 영역 신호들 중 어느 하나에 대응되는 비디오 출력 신호를 생성하는 베이스밴드를 더 포함하는 멀티채널 비디오 수신기에서의 동작 방법.
  19. 제 18항에 있어서, 상기 비디오 출력 신호를 생성하는 것은
    상기 복수의 디지털화된 시간 영역 신호들 중 어느 하나에 대응되는 디지털 비트 스트림을 생성하는 것을 포함하는 멀티채널 비디오 수신기에서의 동작 방법.
  20. 복수의 비디오 신호들을 전송하기 위해 사용되는 주파수 대역의 디지털화된 표현을 생성하는 수단;
    상기 주파수 대역의 디지털화된 표현에 대한 주파수 영역 표현을 생성하기 위해 상기 주파수 밴드의 디지털화된 표현을 고속 퓨리에 변환 동작으로 변환하는 수단; 및
    상기 복수의 비디오 신호들에 대응되는 복수의 디지털화된 시간 영역 신호들을 생성하기 위해 상기 주파수 영역 표현을 역 퓨리에 변환 동작으로 변환하는 수단을 포함하는 멀티채널 비디오 수신기.
KR1020067022710A 2004-04-30 2005-05-02 Ｆｆｔ 기반의 멀티채널 비디오 수신기 KR101110746B1 (ko)

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US20080260044A1 (en) 2008-10-23
CN100466694C (zh) 2009-03-04
WO2005109866A1 (en) 2005-11-17
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