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Class Information
Number: 381/3
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Broadcast or multiplex stereo > Fm final modulation
Description: Subject matter where stereophonic signals are broadcast by means of a radio carrier wave which is only frequency modulated.

Sub-classes under this class:

Class Number Class Name Patents
381/4 Am subcarrier 99

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8688045 FM transmitter and non-FM receiver integrated on single chip Apr. 1, 2014
8682396 Vibration module for portable terminal Mar. 25, 2014
8619997 Receiving apparatus Dec. 31, 2013
8615092 Sound processing device, correcting device, correcting method and recording medium Dec. 24, 2013
8571576 Method of configuring FM radio transmitters in portable devices Oct. 29, 2013
8526622 Configurable filter for processing television audio signals Sep. 3, 2013
8406717 Digital FM stereo receiver architecture to recover carrier information based on stereo or mono signals Mar. 26, 2013
8050412 Scaling adjustment to enhance stereo separation Nov. 1, 2011
8045717 Stereo decoder and method for processing pilot signal Oct. 25, 2011
8009835 Frequency modulation-type transmitting apparatus Aug. 30, 2011
7961890 Multi-channel hierarchical audio coding with compact side information Jun. 14, 2011
7936228 Frequency modulator and FM transmission circuit using the same May. 3, 2011
7822211 Stereo decoding system capable of reducing the phase shift during the signal transforming Oct. 26, 2010
7801311 Radio receiver with stereo decoder and method for use therewith Sep. 21, 2010
7787630 FM stereo decoder incorporating Costas loop pilot to stereo component phase correction Aug. 31, 2010
7693290 Sound reproduction device Apr. 6, 2010
7667553 Frequency modulator using PLL Feb. 23, 2010
7557862 Integrated circuit BTSC encoder Jul. 7, 2009
7474707 Bandwidth reduction of an FM broadcast signal using a baseband precompensation technique Jan. 6, 2009
7428308 Transmitting and reproducing stereophonic audio signals Sep. 23, 2008
7424431 System, method and computer program product for adding voice activation and voice control to a media player Sep. 9, 2008
7406302 Digital FM stereo receiver architecture Jul. 29, 2008
7181018 Digital stereo recovery circuitry and method for radio receivers Feb. 20, 2007
7106809 AM/FM/IBOC receiver architecture Sep. 12, 2006
6978026 Circuit arrangement for gaining a stereo subcarrier and an RDS carrier Dec. 20, 2005
6928046 Frame synchronization of an OFDM signal Aug. 9, 2005
6901146 All-digital FM stereo demodulator and demodulation method May. 31, 2005
6823071 Frequency modulation multiplex demodulation device Nov. 23, 2004
6813359 Apparatus and method for minimizing multipath interference Nov. 2, 2004
6782239 Wireless output input device player Aug. 24, 2004
6714651 FM stereo signal demoudulating apparatus and method Mar. 30, 2004
6694026 Digital stereo recovery circuitry and method for radio receivers Feb. 17, 2004
6671378 Detection of noise in a frequency demodulated FM audio broadcast signal Dec. 30, 2003
6618486 Controller for FM 412 multiplex power regulation Sep. 9, 2003
6473605 Noise reduction and range control radio system Oct. 29, 2002
6404408 Enhanced radio graphic data system Jun. 11, 2002
6295362 Direct digital synthesis of FM signals Sep. 25, 2001
6272226 Apparatus and method for masking audio signals in a signal distribution system Aug. 7, 2001
6211748 FM modulator Apr. 3, 2001
6198825 Wireless speaker circuit Mar. 6, 2001
6178317 System and method for mitigating intermittent interruptions in an audio radio broadcast system Jan. 23, 2001
5801592 Amplitude stabilized oscillator circuit Sep. 1, 1998
5684878 Video signal recorder video apparatus and audio signal receiver Nov. 4, 1997
5682431 FM stereo broadcasting apparatus and method Oct. 28, 1997
5579395 Stereo decoder with cross-talk compensation Nov. 26, 1996
5532762 Digital broadcast receiver that switches between NICAM audio and analog audio Jul. 2, 1996
5497372 FM multiplex broadcasting and receiving system Mar. 5, 1996
5410735 Wireless signal transmission systems, methods and apparatus Apr. 25, 1995
5337196 Stereo/multivoice recording and reproducing video tape recorder including a decoder developing a switch control signal Aug. 9, 1994
5293633 Apparatus and method for providing digital audio in the cable television band Mar. 8, 1994

1 2

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