[특허]Radio receivers for receiving both VSB and QAM digital HDTV signals

Radio receivers for receiving both VSB and QAM digital HDTV signals 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04N-005/44
출원번호	US-0614471 (1996-03-13)
발명자 / 주소	Patel Chandrakant Bhailalbhai Limberg Allen LeRoy
출원인 / 주소	Samsung Electronics Co., Ltd., KRX
대리인 / 주소	Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
인용정보	피인용 횟수 : 81 인용 특허 : 0

초록 ▼

A radio receiver for receiving a selected digital HDTV signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, using the same tuner. The tuner supplies a final IF signal in a 6 MHz frequency band, the lowest frequency of which is not appreciably more than 2.27 MHz. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband, with the 2.375 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner.

대표청구항 ▼

[ What is claimed is:] [1.] A radio receiver for receiving a selected one of television signals each including symbol codes descriptive of digital signals, irrespective of whether said selected digital television signal is a quadrature-amplitude-modulation (QAM) signal or is a vestigial-sideband (VSB) signal including a pilot carrier having an amplitude related to signal levels in said symbol codes thereof, said radio receiver comprising:a tuner for selecting said selected television signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, and converting it to a final intermediate-frequency (IF) signal, the carrier of which said final IF signal is a prescribed subharmonic of a multiple of the symbol frequency of said QAM signal if said selected television signal is a QAM signal and is a prescribed subharmonic of a multiple of the symbol frequency of said VSB signal if said selected television signal is a VSB signal, said prescribed subharmonic of a multiple of the symbol frequency of said QAM signal being lower in frequency than said prescribed subharmonic of a multiple of the symbol frequency of said VSB signal;an analog-to-digital converter for digitizing said final IF signal to generate a digitized final IF signal;QAM synchrodyning circuitry for generating real and imaginary sample streams of interleaved QAM symbol code, by synchrodyning said digitized final IF signal to baseband providing it is a QAM signal and otherwise processing said digitized final IF signal as if it were a QAM signal to be synchrodyned to baseband; andVSB synchrodyning circuitry for generating a real sample stream of interleaved VSB symbol code, by synchrodyning said digitized final IF signal to baseband providing it is a VSB signal and otherwise processing said digitized final IF signal as if it were a SB signal to be synchrodyned to baseband.

이 특허를 인용한 특허 (81)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

Radio receivers for receiving both VSB and QAM digital HDTV signals 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (81)

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Radio receivers for receiving both VSB and QAM digital HDTV signals 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (81)

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