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Class Information
Number: 332/155
Name: Modulators > Amplitude modulator > Percent modulation control or automatic amplitude control of carrier or modulating signal
Description: Subject matter in which amplitude control is exerted on the carrier, the modulating signal, or the ratio therebetween without human intervention.

Sub-classes under this class:

Class Number Class Name Patents
332/157 Average carrier amplitude controlled by modulating signal 8
332/158 Carrier output suppressed during absence of modulating signal 4
332/156 Overmodulation prevention 6

Patents under this class:

Patent Number Title Of Patent Date Issued
8514969 Amplitude control circuit, polar modulation transmission circuit, and polar modulation method Aug. 20, 2013
8269571 Amplitude modulated pulse transmitter Sep. 18, 2012
7933320 Communication system using length shift keying modulation method Apr. 26, 2011
7382208 Operating method for the resonant operation of high-pressure lamps in longitudinal mode, and an associated system and electronic ballast Jun. 3, 2008
6983024 Quadra-polar modulator Jan. 3, 2006
6208217 Ask modulator with frequency dependent voltage divider Mar. 27, 2001
5798674 Band Limited AM modulator using linear power amplification Aug. 25, 1998
5509011 Transmission system for time-division multiplex signal transmission Apr. 16, 1996
5222104 Gain control circuit for radio transmitter Jun. 22, 1993
4816779 Amplitude stabilized oscillator having positive and negative feedback Mar. 28, 1989
4698603 RF amplitude modulator/mixer Oct. 6, 1987
4654607 Modulation control circuit for an amplitude modulator Mar. 31, 1987
4520328 Amplitude modulation circuit having stable modulation characteristics May. 28, 1985
4314374 High power audio frequency transmitter Feb. 2, 1982
4247948 Automatic modulation control in transmitter Jan. 27, 1981
4199723 Automatic modulation control apparatus Apr. 22, 1980
4122415 AM transmitter with an offset voltage to the RF stage to compensate for switching time of the modulators Oct. 24, 1978
4044308 Communication transmitting apparatus with carrier level control Aug. 23, 1977
3974460 High frequency modulator, such as an amplitude modulator, including a frequency multiplier Aug. 10, 1976
3965443 Electronic modulator for guidance systems Jun. 22, 1976

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