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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 5276909 |
Traffic information broadcast system |
Jan. 4, 1994 |
| 5216717 |
Frequency modulation broadcast transmitter synchronization method |
Jun. 1, 1993 |
| 5202925 |
FM stereophonic receiver |
Apr. 13, 1993 |
| 5181249 |
Three channel audio transmission and/or reproduction systems |
Jan. 19, 1993 |
| 5179593 |
FM stereo receiving device |
Jan. 12, 1993 |
| 5077797 |
FM stereo receiver |
Dec. 31, 1991 |
| 5038402 |
Apparatus and method for providing digital audio in the FM broadcast band |
Aug. 6, 1991 |
| 5014341 |
Hybrid master control desk for analog and digital audio signals |
May. 7, 1991 |
| 5012516 |
Switching circuitry |
Apr. 30, 1991 |
| 4866775 |
Intergrated multisound signal demodulator circuit |
Sep. 12, 1989 |
| 4847903 |
Wireless remote speaker system |
Jul. 11, 1989 |
| 4829570 |
Wireless remote speaker system |
May. 9, 1989 |
| 4817167 |
Method of receiving frequency-modulated stereo multiplex signals |
Mar. 28, 1989 |
| 4817151 |
Selective decoder for compatible FM stereophonic system utilizing companding of difference signal |
Mar. 28, 1989 |
| 4747140 |
Low distortion filters for separating frequency or phase modulated signals from composite signals |
May. 24, 1988 |
| 4723286 |
Dematrixing circuit of the switched-capacitor type |
Feb. 2, 1988 |
| 4716589 |
Multivoice signal switching circuit |
Dec. 29, 1987 |
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