| Patents for H03C 1 - Amplitude modulation (2,214) |
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| 09/08/1994 | EP0622003A4 Multichannel television signal scrambling and descrambling system and method. |
| 09/06/1994 | US5345198 Power supply modulator circuit for transmitter |
| 08/30/1994 | US5343171 Circuit for improving carrier rejection in a balanced modulator |
| 08/24/1994 | CN2175494Y Integral cavity for U frequency oscillation modulation |
| 08/03/1994 | EP0608697A1 Modulation method and circuit for high frequency signals |
| 07/19/1994 | US5331293 Compensated digital frequency synthesizer |
| 07/12/1994 | US5329260 Numerically-controlled modulated oscillator and modulation method |
| 07/05/1994 | US5327462 Digital type VSB modulation apparatus |
| 06/29/1994 | CN1025264C Diode modulation attenuation iusulating system |
| 06/22/1994 | CN1088376A 多模式信号处理 Multi-mode signal processing |
| 06/01/1994 | EP0599686A1 Digital circuit for extracting phase and envelope signals from a single side band signal |
| 05/21/1994 | CA2103315A1 Digital circuit for the extraction of the phase and envelope signals of a single sideband signal |
| 05/18/1994 | CN1086942A 数字信号处理器激励器 A digital signal processor exciter |
| 05/11/1994 | WO1994010779A1 Multi-mode signal processing |
| 05/10/1994 | US5311151 I/Q modulator and demodulator having a single bridge |
| 05/10/1994 | US5311142 Amplifier circuit with gain that does not vary with power supply fluctuations |
| 05/04/1994 | EP0595781A2 Multi-mode signal processing |
| 05/04/1994 | EP0595695A1 Ultrasonic sounding system with digital phase control |
| 05/03/1994 | CA2050756C Modulator using low-pass filter as delay element |
| 04/27/1994 | CN1024383C Method of compensating for non-linearities in end amplifier incorporated in radio transmitter |
| 04/19/1994 | US5304943 In-phase combiner and RF recovery system |
| 04/12/1994 | US5303412 Composite direct digital synthesizer |
| 03/31/1994 | WO1994007302A1 Digital signal processor exciter |
| 03/31/1994 | CA2145187A1 Digital signal processor exciter |
| 03/23/1994 | EP0588444A1 Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto |
| 03/17/1994 | WO1994006204A1 Compensated digital frequency synthesizer |
| 03/01/1994 | US5291201 Microwave integrated circuit frequency translating apparatus |
| 03/01/1994 | US5291154 Synchronous single cycle sample and control amplitude modulator |
| 02/09/1994 | EP0582176A1 Even order term mixer |
| 01/18/1994 | US5280633 Active antenna for two-way transmission |
| 12/08/1993 | EP0572974A1 Harmonic distortion compensation circuit |
| 12/07/1993 | US5268658 Digital amplitude modulator and method of signal combining |
| 12/01/1993 | CN1022966C Method and device for fast phase shift adjusting of linear transmitter |
| 11/25/1993 | WO1993023921A1 Method and apparatus for amplifying, modulating and demodulating |
| 11/25/1993 | CA2135304A1 Method and apparatus for amplifying modulating and demodulating |
| 11/23/1993 | US5265120 Binary phase shift keying modulation system and/or frequency multiplier |
| 11/09/1993 | US5260674 Amplitude modulator |
| 11/02/1993 | CA2005655C Hot standby transmitter switching system |
| 10/05/1993 | US5251330 Linear transmitter |
| 09/30/1993 | WO1993019457A1 Electronic musical instrument using fm sound generation with delayed modulation effect |
| 09/30/1993 | DE4213470C1 TV amplitude modulator circuit with constant carrier phase - uses fast switching 5 nano-second FET, high speed operational amplifier and band-pass filter or frequency converter stage |
| 09/29/1993 | EP0562255A1 AM radio transmitter for various modulations, especially DSB, SSB, ISB |
| 09/16/1993 | WO1993018597A1 Binary phase shift keying modulation system or frequency multiplier |
| 09/16/1993 | WO1993018578A1 Direct digital synthesizer for modulation |
| 09/07/1993 | US5243304 Vestigial sideband modulator for a baseband input signal |
| 09/07/1993 | US5243124 Electronic musical instrument using FM sound generation with delayed modulation effect |
| 08/24/1993 | US5239275 Amplitude modulator circuit having multiple power supplies |
| 07/22/1993 | WO1993014597A1 Multichannel television signal scrambling and descrambling system and method |
| 07/20/1993 | CA2040354C Amplitude modulator having negative feedback circuit for reducing distortion |
| 06/29/1993 | US5224119 Vector FM modulator |
| 06/29/1993 | US5223801 Crystal oscillator and transmitter operating at the third harmonic of the fifth overtone of a crystal |
| 06/16/1993 | EP0546719A1 I/Q modulator and demodulator |
| 06/10/1993 | WO1993011279A1 Electric power distribution system for active cathodic protection of reinforced concrete constructions |
| 05/25/1993 | US5214397 Modulator using low-pass filter as delay element |
| 05/19/1993 | CA2082002A1 Single sideband modulator for translating baseband signals to radio frequency in single stage |
| 04/06/1993 | US5200719 Impedance-matching coupler |
| 03/03/1993 | EP0529874A1 Vector locked loop |
| 03/02/1993 | US5191597 Method of compensating for non-linearities in an end amplifier incorporated in a radio transmitter |
| 02/16/1993 | US5187682 Four quadrant analog multiplier circuit of floating input type |
| 02/10/1993 | CN1068920A Attenuation isolating system using diode modulation |
| 01/13/1993 | EP0522525A1 Process for compensation of AM/PM distortion of a transmitter by modulation of the local oscillator phase, and associated compensation circuit |
| 12/29/1992 | US5175877 Apparatus and method for generating an amplitude modulated rf signal |
| 12/15/1992 | US5172394 Method for reducing the content of spurious signals in the output signals of a mixer, and mixer for carrying out the method |
| 12/15/1992 | US5172079 Balanced modulator designed for low supply voltage |
| 11/10/1992 | US5162763 Single sideband modulator for translating baseband signals to radio frequency in single stage |
| 10/14/1992 | EP0508741A2 Vestigial sideband modulator |
| 10/14/1992 | EP0508736A2 Four quadrant analog multiplier circuit of floating input type |
| 10/07/1992 | EP0506908A1 Fast phase shift adjusting method and device for linear transmitter |
| 10/06/1992 | US5153536 Suppressed carrier modulator formed from two partial modulators each including a phase delay path |
| 09/16/1992 | EP0503761A1 Power amplifying means for r.f. signals |
| 09/15/1992 | CA2061135A1 Power amplifying means for r.f. signals |
| 09/15/1992 | CA1307560C Method of generating an amplitude-modulated isb transmission signaland apparatus for carrying out the method |
| 08/18/1992 | US5140287 Diode circuit flicker-noise reduction |
| 08/12/1992 | EP0498457A2 Digital type VSB modulation apparatus |
| 07/28/1992 | US5134718 Fast phase shift adjusting method and device for linear transmitter |
| 07/01/1992 | EP0491806A1 Carrier modulation without sidebands |
| 06/23/1992 | US5124672 Combined analog/digital frequency modulator |
| 06/23/1992 | US5124665 Circuit for reducing distortion produced by an r.f. power amplifier |
| 06/09/1992 | US5121077 Circuit for reducing distortion produced by an r.f. power amplifier |
| 06/02/1992 | US5119396 Binary phase shift keying modulation system |
| 05/20/1992 | CN1061310A Fast phase shift adjusting method and device for linear transmitter |
| 05/19/1992 | US5115468 SSB digital modulator |
| 05/19/1992 | US5115409 Multiple-input four-quadrant multiplier |
| 05/12/1992 | US5113525 Linear-modulation type radio transmitter |
| 05/01/1992 | WO1992008291A1 Fast phase shift adjusting method and device for linear transmitter |
| 04/15/1992 | EP0480145A1 Modulator and mixer stage |
| 04/14/1992 | US5105168 Vector locked loop |
| 04/01/1992 | EP0192708B1 Nmr tuning procedure |
| 03/12/1992 | DE4027703A1 Integrated switch modulator multiplying input and binary carrier - uses operational amplifier with resistive feedback and controlled semiconductor switch |
| 03/10/1992 | US5095290 Amplitude modulator having negative feedback circuit for reducing distortion |
| 02/11/1992 | CA1295695C Reducing phase modulation of digital amplifiers |
| 02/11/1992 | CA1295687C Rf driver power supply |
| 01/02/1992 | DE4020083A1 Digital transmitter modulator using modulation oscillator - has single sideband signal fed through bandpass filter and mixed with auxiliary oscillator signal |
| 12/31/1991 | US5077542 Transmission system with suppressed carrier signal amplitude modulation preserving the polarity of the transmitted signal, and corresponding transmitter and receiver |
| 12/17/1991 | US5073974 Hot standby transmitter switching system using upper and lower sideband waves |
| 10/16/1991 | EP0451372A1 Modulator circuit |
| 10/08/1991 | CA1290408C Microwave tube modulator |
| 10/02/1991 | EP0449729A2 Flat power resistance |
| 10/02/1991 | EP0449720A1 Bidirectional transmission active antenna |
| 10/01/1991 | US5054116 Feed-forward automatic level control circuit for a high-frequency source |