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Class Information
Number: 331/20
Name: Oscillators > Automatic frequency stabilization using a phase or frequency sensing means > With reference oscillator or source > T.v. sync type
Description: Subject matter wherein the oscillator system is of the type peculiarly adapted for use in television systems (e.g., vertical or horizontal sweep generators), the reference source comprising synchronizing pulses (usually of short duration) which pulses are compared with signals representative of the generated waves of the controlled oscillator in a phase comparison means, the resulting control or error signal from the comparison means being utilized to adjust the frequency of the controlled oscillator to restore it to the desired relationship with reference frequency.

Sub-classes under this class:

Class Number Class Name Patents
331/21 Lock to power line 10

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8310595 Phase determination for resampling video Nov. 13, 2012
8306155 Frame-based carrier frequency and phase recovery system and method Nov. 6, 2012
7693245 Frame-based carrier frequency and phase recovery system and method Apr. 6, 2010
7679454 Hybrid phase-locked loop Mar. 16, 2010
7548121 Fractional frequency synthesizer and phase locked loop utilizing fractional frequency synthesizer and method thereof Jun. 16, 2009
7541878 Temperature compensated crystal oscillator Jun. 2, 2009
7443920 Frame-based carrier frequency and phase recovery system and method Oct. 28, 2008
7251465 Method and apparatus for producing mobile radio signals Jul. 31, 2007
6958771 Image processing apparatus working in response to frequency diffused clock as reference input image signals Oct. 25, 2005
6839092 Feed forward error correction in video decoder Jan. 4, 2005
6768385 Intelligent phase lock loop Jul. 27, 2004
6525614 Voltage boost system having feedback control Feb. 25, 2003
6479978 High-resolution measurement of phase shifts in high frequency phase modulators Nov. 12, 2002
6433837 Demodulator, particularly for a SECAM chrominance signal, with double frequency adjustment Aug. 13, 2002
6396545 Method for digital synchronization of video signals May. 28, 2002
6392641 PLL circuit for digital display apparatus May. 21, 2002
6323910 Method and apparatus for producing high-fidelity images by synchronous phase coherent digital image acquisition Nov. 27, 2001
6317005 Process of clock recovery during the sampling of digital-type signals Nov. 13, 2001
6310653 Phase comparison and phase adjustment for synchronization to a reference signal that is asynchronous with respect to a digital sampling clock Oct. 30, 2001
6246292 Phase lock loop circuit with automatic selection of oscillation circuit characteristics Jun. 12, 2001
6229401 Horizontal frequency generation May. 8, 2001
6222590 Phase-locked loop circuit Apr. 24, 2001
6194971 Method and apparatus for phase shifting a controlled oscillator and applications thereof Feb. 27, 2001
6177959 Circuit and method for generating a clock signal synchronized with time reference signals associated with television signals Jan. 23, 2001
6140881 Display apparatus with a circuit for controlling the input voltage of PLL according to display mode and method Oct. 31, 2000
6008859 Image data processing apparatus Dec. 28, 1999
6005357 Vertical oscillation circuit for display device Dec. 21, 1999
5982239 Phase locked loop circuit and a picture reproducing device Nov. 9, 1999
5977836 Method and apparatus for controlling an output frequency of a phase locked loop Nov. 2, 1999
5959682 Data segment sync detection circuit and method thereof Sep. 28, 1999
5815214 Oscillatory signal generator arrangement Sep. 29, 1998
5777520 Horizontal oscillation circuit capable of changing frequency Jul. 7, 1998
5745314 Clock generating circuit by using the phase difference between a burst signal and the oscillation signal Apr. 28, 1998
5719532 Horizontal lock detector Feb. 17, 1998
5712532 Scalable CRT display device and phase synchronous circuit for use in display device Jan. 27, 1998
5703656 Digital phase error detector for locking to color subcarrier of video signals Dec. 30, 1997
5663688 Method of enhancing the noise immunity of a phase-locked loop, and device implementing this method Sep. 2, 1997
5638131 Method to synchronize video modulation using a constant time base Jun. 10, 1997
5614870 Phase lock loop with idle mode of operation during vertical blanking Mar. 25, 1997
5608355 Automatic adjustment circuit for an oscillator Mar. 4, 1997
5604808 FM signal processor Feb. 18, 1997
5574406 Phase lock loop with error measurement and correction in alternate periods Nov. 12, 1996
5541556 Clock recovery circuit for serial digital video Jul. 30, 1996
5539357 Phase locked loop Jul. 23, 1996
5537613 Device and method for detecting pilot signal for two-carrier sound multiplexing system Jul. 16, 1996
5506627 Phase locked loop chain for locking audio sampling to serial digital component vide timing Apr. 9, 1996
5486866 Oscillator free run frequency setting by data bus control Jan. 23, 1996
5479137 Controlled oscillator, as for synchyronous video detector Dec. 26, 1995
5467399 Coherent signal generation in digital radio receiver Nov. 14, 1995
5450137 Signal processing apparatus Sep. 12, 1995

1 2 3 4

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