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Class Information
Number: 375/300
Name: Pulse or digital communications > Transmitters > Amplitude modulation
Description: Subject matter in which the pulses are multiplied with a carrier wave so as to produce and transmit at least one sideband equal to the carrier plus or minus the baseband.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6895252 |
Economical extension of the operating distance of an RF remote link accommodating information signals having differing carrier frequencies |
May. 17, 2005 |
| 6792050 |
Ask modulation apparatus and method |
Sep. 14, 2004 |
| 6784817 |
Data generating method, data generator, and transmitter using the same |
Aug. 31, 2004 |
| 6782057 |
Very high-speed digital RF clipper/modulator |
Aug. 24, 2004 |
| 6754287 |
Method and apparatus for producing a modulated signal |
Jun. 22, 2004 |
| 6738432 |
System and method for RF signal amplification |
May. 18, 2004 |
| 6701134 |
Increased dynamic range for power amplifiers used with polar modulation |
Mar. 2, 2004 |
| 6694104 |
Variable-rate communication system with optimal filtering |
Feb. 17, 2004 |
| 6665525 |
High-level modulation method and apparatus |
Dec. 16, 2003 |
| 6587452 |
High performance signal structure with multiple modulation formats |
Jul. 1, 2003 |
| 6567988 |
Video signal transmission apparatus and video signal transmission method |
May. 20, 2003 |
| 6529562 |
Ask Modulator |
Mar. 4, 2003 |
| 6512799 |
Digital communication system and method for increased bit rates |
Jan. 28, 2003 |
| 6504880 |
ASK modulation circuit |
Jan. 7, 2003 |
| 6490440 |
Digital transmitter circuit and method of operation |
Dec. 3, 2002 |
| 6445750 |
Technique for communicating digitally modulated signals over an amplitude-modulation frequency band |
Sep. 3, 2002 |
| 6434135 |
Adaptive RF amplifier prelimiter |
Aug. 13, 2002 |
| 6418300 |
Method and device for transmitting mixed analog and digital signals by the same transmitter |
Jul. 9, 2002 |
| 6400777 |
Linear modulator |
Jun. 4, 2002 |
| 6326860 |
Amplitude modulator capable of minimizing power leakage to adjacent channels |
Dec. 4, 2001 |
| 6292067 |
Ask modulator and communication device using the same |
Sep. 18, 2001 |
| 6289056 |
Broadband multicarrier modulator and corresponding programming method |
Sep. 11, 2001 |
| 6239666 |
Uniform amplitude modulator |
May. 29, 2001 |
| 6201452 |
Systems and methods for converting a stream of complex numbers into a modulated radio power signal |
Mar. 13, 2001 |
| 6163231 |
Millimeter wave modulator and transmitter |
Dec. 19, 2000 |
| 6134275 |
Method for transmitting data between a terminal and a portable data carrier over a wireless electromagnetic transmission link |
Oct. 17, 2000 |
| 6122326 |
High precision, low phase noise synthesizer with vector modulator |
Sep. 19, 2000 |
| 6118987 |
Radio transmitting apparatus and gain control method for the same based on complex weight coefficients and modulation precision characteristics |
Sep. 12, 2000 |
| 6101224 |
Method and apparatus for generating a linearly modulated signal using polar modulation |
Aug. 8, 2000 |
| 6078628 |
Non-linear constant envelope modulator and transmit architecture |
Jun. 20, 2000 |
| 6041082 |
Digital amplitude modulation amplifier and television broadcasting machine |
Mar. 21, 2000 |
| 6018275 |
Phase locked loop with down-conversion in feedback path |
Jan. 25, 2000 |
| 5970046 |
Apparatus for demodulating AM data multiplexed modulated wave signal |
Oct. 19, 1999 |
| 5966645 |
Transmitter with low-level modulation and minimal harmonic emissions |
Oct. 12, 1999 |
| 5956373 |
AM compatible digital audio broadcasting signal transmision using digitally modulated orthogonal noise-like sequences |
Sep. 21, 1999 |
| 5930689 |
Apparatus and method for producing a plurality of output signals with fixed phase relationships therebetween |
Jul. 27, 1999 |
| 5898732 |
Data service channel provision for an AM compatible broadcast system |
Apr. 27, 1999 |
| 5859876 |
Method and apparatus for improving AM compatible digital broadcast analog fidelity |
Jan. 12, 1999 |
| 5798674 |
Band Limited AM modulator using linear power amplification |
Aug. 25, 1998 |
| 5783974 |
Digital interpolation up sampling circuit and digital modulator using same |
Jul. 21, 1998 |
| 5729575 |
Transmitter and receiver system and method utilizing a pilot carrier notch data encoded signal |
Mar. 17, 1998 |
| 5726609 |
Pulse amplitude modulator using direct digital synthesizer |
Mar. 10, 1998 |
| 5712876 |
Radio station apparatus and signal transmission method thereof |
Jan. 27, 1998 |
| 5680078 |
Mixer |
Oct. 21, 1997 |
| 5673292 |
AM-PSK system for broadcasting a composite analog and digital signal using adaptive M-ary PSK modulation |
Sep. 30, 1997 |
| 5659272 |
Amplitude modulation method and apparatus using two phase-modulated signals |
Aug. 19, 1997 |
| 5606576 |
Adaptive mode control system for AM compatible digital broadcast |
Feb. 25, 1997 |
| 5602868 |
Multiple-modulation communication system |
Feb. 11, 1997 |
| 5583467 |
Amplitude modulated RF pulse generator |
Dec. 10, 1996 |
| 5459749 |
Multi-level superposed amplitude-modulated baseband signal processor |
Oct. 17, 1995 |
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