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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:

Class Number Class Name Patents
375/301 Single or vestigial sideband or suppressed carrier 158

Patents under this class:
1 2 3 4 5 6 7

Patent Number Title Of Patent Date Issued
7298795 Wire communications systems and methods employing single and multiple sinewave modulation and demodulation techniques Nov. 20, 2007
7289005 Polar modulator and a method for modulation of a signal Oct. 30, 2007
7277681 Interrogator of moving body identification device Oct. 2, 2007
7269232 Device for producing a phase and amplitude modulated radio frequency signal Sep. 11, 2007
7260159 Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying (QPSK) or offset quaternary phase shift keying (OQPSK) Aug. 21, 2007
7260368 Linear amplification with non-linear components (LINC) modulator and method for generating out-phased signals for a LINC transmitter Aug. 21, 2007
7248639 Method for reducing the out-of-band emission in AM transmitters for digital transmission Jul. 24, 2007
7248842 Wireless communication apparatus having a phase control loop shared by first and second modulation modes and an amplitude control loop Jul. 24, 2007
7230993 Method and apparatus for modulation using an at least four-dimensional signal constellation Jun. 12, 2007
7227874 Apparatus and method for determining a modulation scheme in a communication system Jun. 5, 2007
7224748 Method for reducing out-of-band and spurious emissions of AM transmitters in digital operation May. 29, 2007
7212791 Transmission device and delay time adjustment method thereof May. 1, 2007
7170950 DRM/AM simulcast Jan. 30, 2007
7162000 Delay locked loop synthesizer with multiple outputs and digital modulation Jan. 9, 2007
7158576 Orthogonally-multiplexed orthogonal amplitude modulation method Jan. 2, 2007
7154959 System and method for emulating a multiple input, multiple output transmission channel Dec. 26, 2006
7139534 Transmission circuit Nov. 21, 2006
7120202 Wireless communication apparatus Oct. 10, 2006
7092683 Transmission circuit Aug. 15, 2006
7092682 Electronic circuit, modulation method, information processing device, and information processing method Aug. 15, 2006
7085544 Transmitter having a phase control loop whose frequency bandwidth is varied in accordance with modulation modes Aug. 1, 2006
7082290 Communication semiconductor integrated circuit, a wireless communication apparatus, and a loop gain calibration method Jul. 25, 2006
7079598 Complex phase-locked loop demodulator for low-IF and zero-IF radio receivers Jul. 18, 2006
7065150 System and method for generating a root raised cosine orthogonal frequency division multiplexing (RRC OFDM) modulation Jun. 20, 2006
7065328 Superregenerative AM demodulator Jun. 20, 2006
7054385 Reduction of average-to-minimum power ratio in communications signals May. 30, 2006
7046741 Single and multiple sinewave modulation and demodulation techniques, apparatus, and communications systems May. 16, 2006
7035600 Digitally adaptive modulated transmitter Apr. 25, 2006
7016659 Amplitude modulation with time- and spectrum-shared sidebands Mar. 21, 2006
7010276 Communications signal amplifiers having independent power control and amplitude modulation Mar. 7, 2006
7003048 Communication arrangement comprising powerful integrated amplitude-modulation means Feb. 21, 2006
6983024 Quadra-polar modulator Jan. 3, 2006
6975177 Method and system for a generation of a two-level signal Dec. 13, 2005
6975687 Linearized offset QPSK modulation utilizing a sigma-delta based frequency modulator Dec. 13, 2005
6956510 Methods, software, circuits and systems for coding information Oct. 18, 2005
6952456 Ultra wide band transmitter Oct. 4, 2005
6937668 Method of and apparatus for performing modulation Aug. 30, 2005
6937108 Methods and apparatus for offset chirp modulation Aug. 30, 2005
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

1 2 3 4 5 6 7

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