| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 121 | Am-rf transmitter compensating power variation | JP4049687 | 1987-02-25 | JPS62248316A | 1987-10-29 | GIRUMAA ERU HARUSEI; BURAIAN EE UIIBAA |
| 122 | JPS6243373B2 - | JP1242579 | 1979-02-06 | JPS6243373B2 | 1987-09-14 | YOSHIKAWA YOSHIKAZU; NISHIMURA TOSHUKI; TSUDA JUJI |
| 123 | JPS6157733B2 - | JP3158277 | 1977-03-24 | JPS6157733B2 | 1986-12-08 | KASHU KEIICHIRO |
| 124 | JPS58500831A - | JP50162582 | 1982-04-19 | JPS58500831A | 1983-05-19 | |
| 125 | JPS5759966B2 - | JP11124778 | 1978-09-12 | JPS5759966B2 | 1982-12-17 | USHAMA KATSUMI; KIBUKAWA TAKAO |
| 126 | Automatic pulse modulation controller | JP6072781 | 1981-04-23 | JPS57564A | 1982-01-05 | JIUSETSUPE BERUTOTSUCHI |
| 127 | JPS56500556A - | JP50119580 | 1980-05-21 | JPS56500556A | 1981-04-23 | |
| 128 | Rf transmitter | JP443979 | 1979-01-17 | JPS54115012A | 1979-09-07 | FUOORISUTO MAASHIYARU KAMINGUZ; JIYATSUKU SUREIDO SERUMAIAA |
| 129 | Pulse radar transmitter | JP4499177 | 1977-04-19 | JPS53129992A | 1978-11-13 | FUKUI HIDETO |
| PURPOSE:To detect the abnormality of a modulator by providing a route for current which flows only at the abnormal time and detecting the current before pulses are generated in an abnormal voltage detection circuit of the case when an SCR magnetic system modulator is used. | ||||||
| 130 | RETURN TO ZERO AND SAMPLING PULSE GENERATING CIRCUITS AND METHOD FOR DIRECT DIGITAL UP CONVERSION | PCT/US0309073 | 2003-03-24 | WO03085415A2 | 2003-10-16 | KOMIAK JAMES J |
| Direct up-conversion of a signal (10) is accomplished using a sampling pulse generator circuit (12, 16, 20, 24) and a gated differential amplifier 26, enabled by the sampling signal (25). When not enabled, the output of the differential amplifier (26) is pulled to zero. The sampling pulse (25) is generated from a base frequency sine wave (10) which is squared with a limiting amplifier (12), and further passed through one or more frequency doublers (16, 20) producing a times two signal (18), a times four signal (22) and so on. The squared base frequency 14 and frequency doubled signals (18, 22) are logically ORed (24) to produce a short duration pulse (25) which repeats at the frequency of the base signal. The resulting output (34) is an amplitude modulated pulse doublet time domain waveform. | ||||||
| 131 | METHOD AND SYSTEM FOR DIGITAL TRANSMISSION USING AMPLITUDE-MODULATED TRANSMITTERS WITH MODULATION TRANSFORMER | PCT/EP0001569 | 2000-02-25 | WO0052817A3 | 2001-05-25 | RUDOLPH DIETMAR; BOROWICZ HANS-JOERG |
| Amplitude-modulated radio broadcasting transmitters operating in the long, medium and short-wave range can be used for digital transmission provided they comprise a modulator which transmits a direct component (mean envelope signal). AM-transmitters with modulation transformers, which remain widely used worldwide, cannot be converted to digital transmission because the modulation transformers do not transmit a direct component and their lower cut-off frequency of approximately 30 hertz is far too high. According to the invention, digital transmission using AM-transmitters with modulation transformers is made possible by transmitting the mean envelope signal by constant adjustment to the dc voltage of the transmitter output stage and compensating the lower cut-off frequency of the modulation transformer by means of an adapted transmission network. The same method can be used to compensate the pre-stages of the modulation amplifier by using, for each stage, a transmission network with a low frequency response. Alternatively it is also possible to replace the low-output pre-stages with dc-coupled amplifiers. | ||||||
| 132 | METHOD FOR THE PRODUCTION OF A DIGITALLY MODULATED HIGH-FREQUENCY SIGNAL | PCT/EP2008053055 | 2008-03-14 | WO2008113749A3 | 2008-12-11 | DEMHARTER NIKOLAUS; HOECHT PHILIPP |
| The invention relates to a method for the production of a high-frequency signal (HF, HF') modulated as a function of a low-frequency digital data stream (NF). For this purpose, a clock signal (T) is provided, the frequency of which is at least four times as high as the frequency of the high-frequency signal (HF, HF') to be produced. Said clock signal (T) is then used for mixing the low-frequency data stream (NF) with a cyclical numeric sequence (ZR) representing a continuous sinusoidal or cosinusoidal series. The invention further relates to a circuit arrangement (1) in which such a method may be used to produce a high-frequency signal (HF) modulated as a function of a low-frequency digital data stream (NF), and a magnetic resonance tomography system having such a circuit arrangement (1). | ||||||
| 133 | METHOD AND APPARATUS FOR GENERATING RF WAVEFORMS HAVING AGGREGATE ENERGY WITH DESIRED SPECTRAL CHARACTERISTICS | PCT/US0332786 | 2003-10-17 | WO2004036810A3 | 2008-10-30 | FULLERTON LARRY W; BRADLEY ARTHUR T; ROBERTS MARK D |
| The present invention relates to a method and system that emulates a desired waveform by producing a time profile (5005) of the desired waveform, which is characterized by a plurality of sample values, and generating a plurality of RF waveforms, each RP waveform of the plurality of RF waveforms having a polarity (5012, 5014) and scaled energy based on a corresponding one of the plurality of sample values, to produce an aggregate RF energy (5008) having spectral characteristics that approximate the spectral characteristics of the desired waveform. | ||||||
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