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Class Information
Number: 381/15
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Broadcast or multiplex stereo > Am or both am and angle final modulation
Description: Subject matter having a carrier wave which is amplitude modulated and which may also be angle modulated.

Sub-classes under this class:

Class Number Class Name Patents
381/16 Having transmitter 68

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8682396 Vibration module for portable terminal Mar. 25, 2014
8433077 Noise removal device and noise removal method Apr. 30, 2013
8345884 Signal separation reproduction device and signal separation reproduction method Jan. 1, 2013
8050412 Scaling adjustment to enhance stereo separation Nov. 1, 2011
8045717 Stereo decoder and method for processing pilot signal Oct. 25, 2011
7961890 Multi-channel hierarchical audio coding with compact side information Jun. 14, 2011
7932775 Digital demodulation device and related method Apr. 26, 2011
7894609 Stereo signal processing apparatus Feb. 22, 2011
7639821 System and method for improved detection of AM signals Dec. 29, 2009
7558549 Method and system for rejecting single-sided leakage into an amplitude modulated (AM) channel Jul. 7, 2009
7302011 Quadrature frequency doubling system Nov. 27, 2007
7295631 Stereo demultiplexer Nov. 13, 2007
7043026 Method for removing AM neighboring interference and a circuit for the same May. 9, 2006
6813359 Apparatus and method for minimizing multipath interference Nov. 2, 2004
6671494 Small, battery operated RF transmitter for portable audio devices for use with headphones with RF receiver Dec. 30, 2003
6570500 Infra-sound surveillance system May. 27, 2003
6459796 AM stereo receiver with reduced distortion Oct. 1, 2002
6406439 Phase lock evoked response audiometer Jun. 18, 2002
6347146 Noise reducing Feb. 12, 2002
6272226 Apparatus and method for masking audio signals in a signal distribution system Aug. 7, 2001
6111957 Apparatus and method for adjusting audio equipment in acoustic environments Aug. 29, 2000
6047170 Automatic squelch control for narrow band AM radio Apr. 4, 2000
5915028 Amplitude demodulator Jun. 22, 1999
5784466 Co-channel interference detector Jul. 21, 1998
5706350 Stereophonic decoder Jan. 6, 1998
5703954 Method and apparatus for improving the quality of AM compatible digital broadcast system signals in the presence of distortion Dec. 30, 1997
5668923 Voice messaging system and method making efficient use of orthogonal modulation components Sep. 16, 1997
5561716 Demodulator Oct. 1, 1996
5467399 Coherent signal generation in digital radio receiver Nov. 14, 1995
5359661 Out-of-lock detector for synchronous AM detection Oct. 25, 1994
5357574 Coherent signal generation in digital radio receiver Oct. 18, 1994
5341431 AM stereo detection and audio processing apparatus Aug. 23, 1994
5261004 Noise blanking circuit for AM stero Nov. 9, 1993
5253298 Reducing audible noise in stereo receiving Oct. 12, 1993
5239699 AM-FM combined stereo receiver Aug. 24, 1993
5222144 Digital quadrature radio receiver with two-step processing Jun. 22, 1993
5151939 Adaptive audio processor for AM stereo signals Sep. 29, 1992
5050237 Radio receiver having automatic bandwidth control during tuning Sep. 17, 1991
5023909 Multi-system AM stereo receiver having preferred mode of operation Jun. 11, 1991
5014316 Compatible quadrature amplitude modulation detector system May. 7, 1991
5008939 AM noise reducing Apr. 16, 1991
RE33381 Multiple system AM stereo receiver and pilot signal detector Oct. 9, 1990
4955072 Method of generating an amplitude-modulated ISB transmission signal and apparatus for carrying out the method Sep. 4, 1990
4944011 Circuit for controlling operator indicators in an AM stereo receiver Jul. 24, 1990
4903329 Clamping circuit for a PLL tuning system Feb. 20, 1990
4887297 Apparatus for processing stereo signals and universal AM stereo receivers incorporating such apparatus Dec. 12, 1989
4872207 Automatic IF tangent lock control circuit Oct. 3, 1989
4866779 Adaptive AM audio processor Sep. 12, 1989
4845750 Multiple function control circuit for an AM stereo receiver Jul. 4, 1989
4815141 Apparatus and methods for removing unwanted components from a communications signal Mar. 21, 1989

1 2 3

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