[특허]FM receiver and demodulation circuit

FM receiver and demodulation circuit 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/00
출원번호	US-0524097 (1974-11-15)
우선권정보	DT-2358288 (1973-11-22)
발명자 / 주소	Gassmann Gerhard-Gunter (Berkheim DT)
출원인 / 주소	International Standard Electric Corporation (New York NY 02)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

An FM receiver has a first pair of signal mixers for receiving an RF signal and a local oscillator for providing a signal to said mixers at a frequency near the center frequency of the received signal. A phase shifter shifts the phase of the local oscillator signal to one mixer by 90°. The outputs of the first pair of mixers are connected to low pass filters having cut-off frequencies equal to approximately one-half the bandwidth of the received signals. A second pair of signal mixers receive the filtered signals and an oscillator signal at a frequency equal to at least twice the cut-off frequency of the low pass filters. The oscillator signal to one of the mixers is phase shifted 90°. The outputs of said second pair of mixers are added together, amplified, limited and thereafter demodulated to provide an audio signal. Automatic frequency control is also provided for the local oscillator.

대표청구항 ▼

A receiver for frequency modulated RF signals having a known center frequency and bandwidth, comprising: a first and second signal mixing means each having first and second inputs and an output; means for receiving said frequency modulated RF signals and providing said signals to the first inputs of said first and second mixing means; first oscillator means having an output for providing a signal having a frequency approximately 10 kHz from the center frequency of the received signal, the output of said oscillator means being connected to the second inputs of each of said first and second mixing means; phase shifting means disposed at one of said inputs of the first mixing means for shifting the signal applied thereto by 90°; a pair of low pass filter means connected to the outputs of said first and second mixing means, said low pass filter means having a cut off frequency equal to approximately one-half the bandwidth of the received signals; third and fourth means for signal mixing and carrier suppression, each means having first and second inputs and an output, first inputs of said third and fourth means being connected to the pair of low pass filter means for receiving a filtered signal therefrom, said third mixing means receiving the signal from the first mixing means; second oscillator means having an output providing a signal having a frequency equal to at least twice the cut off frequency of the low pass filter means, the output of said oscillator means being connected to the second inputs of each of said third and fourth mixing means; phase shifting means disposed at the second input of the third mixing means for shifting the signal received thereby by 90°; adding means having first and second inputs connected to the outputs of the second pair of mixing means for adding the signals received therefrom and for providing an output signal; means for receiving the output signal from the adding means and for amplifying and limiting said signal and for providing a limited output signal; and demodulation means for receiving and demodulating the limited output signal for providing a demodulated audio signal.

이 특허를 인용한 특허 (41)

Petrov,Andrei R.; Christensen,Craig L., Adaptive diversity receiver architecture.
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Yamashita Sadahiko (Kawasaki JPX) Onishi Hiroshi (Kawasaki JPX) Saito Mitsuo (Kawasaki JPX) Sagawa Morikazu (Kawasaki JPX), Circuit arrangement for a wide-band VHF-UHF television double superheterodyne receiver.
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Hayes, Robert R.; Ng, Willie W., Coherent RF-photonic link linearized via a negative feedback phase-tracking loop.
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Hayes, Robert R.; Ng, Willie W., Coherent RF-photonic link linearized via a negative feedback phase-tracking loop.
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Gehring Mark R. (Portland OR) Suter Richard R. (Beaverton OR) Ragan Lawrence H. (Richardson TX), Direct conversion FM receiver with offset.
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Petrov,Andrei R.; Blanchard,Shane A., Direct conversion receiver for amplitude modulated signals using linear/log filtering.
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Petrov,Andrei R.; Christensen,Craig L., Direct conversion receiver with direct current offset correction circuitry.
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Heck Joseph P. (Ft. Worth TX), Dual conversion FM receiver using phase locked direct conversion IF.
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Heck Joseph P. (Ft. Worth TX), Dual port FM demodulation in phase locked receivers.
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Okanobu Taiwa (Tokyo JPX), FM/AM broadcast signal converter.
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Hansen Jens (Berlin DEX), Filter and demodulation circuit for filtering an intermediate frequency modulated signal carrying a modulation signal.
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Kappeler Otmar (Neuenburg DEX), Generator circuit for generating two sinusoidal signals with a phase difference of 90 degrees.
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Tuttle, G. Tyson; Kasha, Dan B., Integrated low-IF terrestrial audio broadcast receiver and associated method.
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Tuttle, G. Tyson; Kasha, Dan B., Integrated low-IF terrestrial audio broadcast receiver and associated method.
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Tuttle, G. Tyson; Kasha, Dan B., Integrated low-if terrestrial audio broadcast receiver and associated method.
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Davie, Alan J., Low IF receiver.
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Tuttle, G. Tyson; Kasha, Dan B., Low-IF integrated data receiver and associated methods.
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Richt, Norbert; Lorenz, Petr, Method and arrangement for generating a frequency-modulated signal.
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Deconche Alain (Guyancourt FRX) Van Uffelen Jean-Pierre H. (Rungis FRX), Method for correcting the frequency of a local carrier in a receiver of a data transmission system and receiver using th.
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Kurihara Hiroshi (Tokyo JPX) Takenaka Sadao (Yokohama JPX) Itaya Eiji (Kamakura JPX), Phase synchronizing circuit.
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Gu, Yongru, Pilot based adaptation for FM radio receiver.
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Kasperkovitz Wolfdietrich G. (Eindhoven NLX), Quadrature detection receiver with separate amplitude and phase control.
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Suominen, Edwin A., Selective channel tuner and tuning method.
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Edwin A. Suominen, Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen, Edwin A., Simplified high frequency tuner and tuning method.
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Suominen,Edwin A., Simplified high frequency tuner and tuning method.
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Richardson Christopher K. (Romsey GB2), Transmitter/receivers capable of contemporaneous transmission/reception.
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Petrov,Andrei R.; Rice,Jeremy J., Up-conversion of a down-converted baseband signal in a direct conversion architecture without the baseband signal passing through active elements.
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Rother Dietrich (Tamm DEX) Wiechert Dieter (Neuenburg-Arnbach DEX) Moster Manfred (Niefern DEX), Zero-IF receiver wih feedback loop for suppressing interfering signals.
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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)
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연합인증

FM receiver and demodulation circuit 원문보기

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FM receiver and demodulation circuit 원문보기

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이 특허를 인용한 특허 (41)

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