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Browse by Category: Main > Information Technology
Class Information
Number: 360/30
Name: Dynamic magnetic information storage or retrieval > Modulating or demodulating > Frequency
Description: Subject matter including specific frequency modulation or demodulation of a signal.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8654467 Disk drive increasing bandwidth of cutoff filter while reading servo sector preamble Feb. 18, 2014
8654465 Implementing spin-torque oscillator sensing with enhanced demodulator for hard disk drives Feb. 18, 2014
8570677 Implementing spin-torque oscillator sensing with enhanced integrated demodulator for hard disk drives Oct. 29, 2013
8553346 Implementing spin-torque oscillator sensing with enhanced delay control feedback circuit for hard disk drives Oct. 8, 2013
8144415 Apparatus, signal-processing circuit and device for magnetic recording system Mar. 27, 2012
8094401 Writing high frequency pattern over a DC background to detect skip track erasure for a disk drive Jan. 10, 2012
7982986 Signal reproducing method, magnetic head and magnetic recording and reproducing apparatus Jul. 19, 2011
7881821 Media storage system Feb. 1, 2011
7826160 Signal reproducing method, magnetic head and magnetic recording and reproducing apparatus Nov. 2, 2010
7821731 Timing recovery for data storage channels with buffered sectors Oct. 26, 2010
7742250 Spectral analysis of a position error signal Jun. 22, 2010
7667916 Signal conversion system and method Feb. 23, 2010
7583457 RAM disk boot of optical media image Sep. 1, 2009
6943970 Position demodulating method and circuit of disk apparatus Sep. 13, 2005
6930845 Data writing and reading Aug. 16, 2005
6853652 Spatial filtering of laser ghosts Feb. 8, 2005
6809585 Frequency modulation system and method Oct. 26, 2004
6687452 Magnetic recording device Feb. 3, 2004
6678110 Robust servo demodulation filtering method Jan. 13, 2004
6564290 Data carrier archiving and control system May. 13, 2003
6490109 Data storage device Dec. 3, 2002
6404584 Analog controls housed with electronic displays for voice recorders Jun. 11, 2002
6392835 Information recording medium library apparatus in which the position of the drive is fixed in the sub body of the apparatus May. 21, 2002
6369966 Standby signal for audio FM demodulator Apr. 9, 2002
6151076 System for phase-locking a clock to a digital audio signal embedded in a digital video signal Nov. 21, 2000
6094102 Frequency synthesizer using micro electro mechanical systems (MEMS) technology and method Jul. 25, 2000
5898531 Signal processing apparatus for digitally modulating input data Apr. 27, 1999
5877907 Apparatus and method for demodulating data signals read from a recording medium Mar. 2, 1999
5729828 Frequency processing circuit with lower sideband suppression and emphasis Mar. 17, 1998
5715353 Sine-wave modulator and playback/recording modulator-demodulator for a high-fidelity video playback/recording system Feb. 3, 1998
5694080 Delay-type FM demodulation circuit Dec. 2, 1997
5655047 Video signal frequency modulator having automatic control function and controlling method therefor Aug. 5, 1997
5592132 Frequency modulator comprising an adjusting circuit Jan. 7, 1997
5517159 Frequency modulating system including feedback clamping circuit May. 14, 1996
5506547 Frequency modulator having LC oscillator with switchable frequencies Apr. 9, 1996
5504463 Frequency modulating system including VCD made of transconductance amplifiers Apr. 2, 1996
5465071 Information signal processing apparatus Nov. 7, 1995
5461339 Apparatus for processing frequency modulated signals Oct. 24, 1995
5442451 Helical scan recording/reproducing device for simultaneously helically recording/reproducing both video and audio signals Aug. 15, 1995
5432649 Magnetic recording and reproducing apparatus Jul. 11, 1995
5424849 Video signal reproduction apparatus and time base correcting device Jun. 13, 1995
5414569 Magnetic recording apparatus with selective recording of auxiliary audio signal May. 9, 1995
5402277 Audio signal reproducing apparatus Mar. 28, 1995
5400149 Magnetic recording apparatus having improved detail emphasis circuit Mar. 21, 1995
5396372 Audio signal recording and reproducing apparatus Mar. 7, 1995
5392128 Still video device that records/reproduces a plurality of identical signals Feb. 21, 1995
5383067 Control signal reproducing circuit Jan. 17, 1995
5379119 Video disk recording apparatus wherein the frequency of the carrier is lowered and the frequency range of the information signal is narrowed when a recording laser beam is positioned at an ext Jan. 3, 1995
5377053 Magnetic reproduction apparatus for reproducing a video signal Dec. 27, 1994
5373398 Video tape recorder with audio carrier absence detection Dec. 13, 1994

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