| 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 | Wave modulation and application thereof | US14511326 | 1926-10-30 | US1810326A | 1931-06-16 | EUGENE PETERSON |
| 122 | Wave-suppression circuit | US19844427 | 1927-06-13 | US1795484A | 1931-03-10 | FARRINGTON JOHN F |
| 123 | Signaling | US37632429 | 1929-07-06 | US1794645A | 1931-03-03 | WILHELM RUNGE |
| 124 | Translating circuit | US75754824 | 1924-12-22 | US1672056A | 1928-06-05 | CARSON JOHN R |
| 125 | Translating apparatus | US1654062D | US1654062A | 1927-12-27 | ||
| 126 | Method of and means for transmitting signals | US43014320 | 1920-12-13 | US1638580A | 1927-08-09 | WARREN HORTON JOSEPH |
| 127 | Translating circuits | US50552921 | 1921-10-05 | US1574779A | 1926-03-02 | AFFEL HERMAN A |
| 128 | Selective circuits | US51147521 | 1921-10-29 | US1558909A | 1925-10-27 | WILLIAM NICHOLS HAROLD |
| 129 | Telephone system with high-frequency oscillations | US49440021 | 1921-08-22 | US1554345A | 1925-09-22 | ERICH HABANN |
| 130 | Radio signaling system | US37551020 | 1920-04-21 | US1525941A | 1925-02-10 | VEYNE LOGWOOD CHARLES |
| 131 | Signaling system | US38674320 | 1920-06-05 | US1519615A | 1924-12-16 | HEISING RAYMOND A |
| 132 | Carrier radiotelephone system | US52779222 | 1922-01-07 | US1458949A | 1923-06-19 | NICHOLS HAROLD W |
| 133 | Translating circuit | US25765418 | 1918-10-10 | US1418285A | 1922-06-06 | CARSON JOHN R |
| 134 | Method of and means for modulating carrier oscillations | US24894318 | 1918-08-08 | US1410890A | 1922-03-28 | CARSON JOHN R |
| 135 | System for transmission of intelligence | US12972816 | 1916-11-06 | US1396786A | 1921-11-15 | SCRIVEN EDWARD O |
| 136 | Transmitting apparatus | US35246520 | 1920-01-19 | US1382206A | 1921-06-21 | MCCAA DAVID G |
| 137 | Radiotelephony. | US8350416 | 1916-03-11 | US1258548A | 1918-03-05 | ENGLUND CARL R |
| 138 | Method and Device for Phase Modulation of a Carrier Wave and Application to the Detection of Multi-Level Phase-Encoded Digital Signals | US15548519 | 2016-01-29 | US20180227154A1 | 2018-08-09 | Denis Christian Glattli; Séverin Preden Roulleau |
| The method of phase modulating a carrier wave involves creating a set of signals sh(t) constituted by a carrier wave of frequency fC and of phase φ(t)=hφ0(t) that is modulated in time t in such a manner that sh(t)=cos(2πfCt+hφ0(t)), where h is an integer and where φ0(t)=2 arctan((t−t0)/w0). The modulation corresponds to a single phase pulse centered on a time t0 of characteristic duration w0 that is positive, and incrementing the phase of the signal sh(t) by the quantity h2π, in such a manner as to generate a single sideband frequency spectrum directly. The carrier wave may be of electromagnetic type or of acoustic type. The method applies in particular to transporting binary information by single sideband phase coding, to generating single sideband orthogonal signals, to detecting single sideband phase coded multiple-level digital signals, to transmitting single sideband phase coded binary signals in-phase and out-of-phase, and to single sideband combined amplitude-and-phase modulation. | ||||||
| 139 | CLIPPING DISTORTION MITIGATION SYSTEMS AND METHODS | US15071042 | 2016-03-15 | US20170272034A1 | 2017-09-21 | Brian Alan Kappus; Victor Joseph Manzella, JR.; Gavin Cutting |
| An audio system includes a processor including an input configured to: receive a baseband audio signal and modulate the baseband audio signal to create a modulated audio signal comprising audio signal frequency components in a first frequency range; clip the modulated audio signal to create a clipped, modulated audio signal the clipped modulated audio signal comprising the audio signal frequency components in the first range and further comprising distortion frequency components outside the first frequency range. The system can further be configured to filter the clipped, modulated audio signal to remove frequency components outside the first frequency to remove distortion components outside that frequency range. | ||||||
| 140 | DC offset cancellation circuit for modulator using 1-bit signal conversion | US11996477 | 2005-08-19 | US07893787B2 | 2011-02-22 | Robert Walkington |
| A DC offset cancellation circuit used for compensating a carrier leak at an output signal of a modulator has a sign extraction unit for extracting sign of an information signal which is applied to the modulator, an envelope detecting unit for performing envelope detection on the output signal of the modulator to output the resulting envelope, a slope detecting unit for performing polarity detection on the slope of the envelope; and a signal processing unit for generating a DC offset cancellation signal for compensating the carrier leak based on the result of the sign extraction and the result of the polarity detection. The signal processing unit preferably calculates the DC offset cancellation signal by multiplying the sign of the information signal by the polarity of the slope of the envelope and accumulating the result of multiplication. | ||||||
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