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| Number | Title | Issue Date |
| 7982986 | Signal reproducing method, magnetic head and magnetic recording and reproducing apparatus A magnetic head, includes a magnetic oscillation element, the oscillation frequency of which is modulated by a medium magnetic field, and a reproducing device configured to detect a phase difference between the adjacent oscillation signals derived from the magnetic ... | 07/19/2011 |
| 7826160 | Signal reproducing method, magnetic head and magnetic recording and reproducing apparatus A magnetic head, includes a magnetic oscillation element, the oscillation frequency of which is modulated by a medium magnetic field, and a reproducing device configured to detect a phase difference between the adjacent oscillation signals derived from the magnetic ... | 11/02/2010 |
| 7583457 | RAM disk boot of optical media image A method includes loading an optical media image representing the content of a physical optical media device from an optical media image source into random access memory (RAM) and emulating the physical optical media device using the optical media image. The optical... | 09/01/2009 |
| 7355939 | System and method for switching control modes of spindle motor A system and method of switching the control modes of spindle motor are described. The switch system comprises a first control module, a second control module and a switch controller. The first control module electrically coupled to the spindle motor and the OPU con... | 04/08/2008 |
| 7173461 | Self-biased phased-locked loop In general, in one aspect, the disclosure describes a phase-locked loop circuit. The circuit includes an oscillator having a first control input and a second control input, wherein the first control input and the second control input act to control output frequency ... | 02/06/2007 |
| 7068745 | Feedforward amplitude cancellation topology for multi-carrier applications A multi-carrier receiver system and method for receiving a transmission frequency multi-carrier signal include a feedforward cancellation loop. A frequency conversion circuit generates an intermediate frequency (IF) multi-carrier signal based on the transmission fre... | 06/27/2006 |
| 6998905 | Noise cancellation circuits and methods Circuits and methods for coherent noise cancellation are provided. More specifically, circuits and methods are provided for coherent cancellation of noise that is present in a data signal due to noise being present in the source signal (e.g., an optical signal) that... | 02/14/2006 |
| 6942142 | Voting ballot, voting machine, and associated methods A voting ballot is provided that comprises a number of selection areas positioned thereon. The voting ballot also includes a ballot specification embodied in a two dimensional bar code and a number of coordinates included in the ballot specification. Each of the coo... | 09/13/2005 |
| 6943970 | Position demodulating method and circuit of disk apparatus Position information PosN and PosQ are compared and position information Pos1 and Pos2 in which influences of an error of a position sensitivity gain appear oppositely are calculated. Subsequently, a weight gain G1=M and a weight gain G2=... | 09/13/2005 |
| 6930845 | Data writing and reading Method and apparatus for recording data on a magnetic recording medium and writing data to a computer bus in which the data is divided into words of a predetermined length, a signal is generated for each data word, having an amplitude which is representative of the ... | 08/16/2005 |
| 6853652 | Spatial filtering of laser ghosts An optical servo writer system including a laser subsystem to generate a multiplicity of light beams, a lens positioned to receive and focus the light beams and a spatial filter positioned in the system so as to allow a subset of the light beams to pass through the ... | 02/08/2005 |
| 6809585 | Frequency modulation system and method A frequency modulation system is disclosed which includes a voltage-controlled oscillator (VCO) 43 and a phase detector 47 configured to receive an output signal from the VCO. The phase detector is arranged to output an error signal representing the ph... | 10/26/2004 |
| 6687452 | Magnetic recording device A magnetic recording device provided with a frequency modulation circuit, a filter circuit, and a frequency conversion circuit. The frequency modulation circuit generates a modified FM luminance signal the frequency of a carrier wave of which is higher th... | 02/03/2004 |
| 6678110 | Robust servo demodulation filtering method A robust and efficient method for determining the location of a transducer head in a mass storage system. A position-indicative signal characterized by a fundamental frequency F is received from a data path including the transducer head. Energy in the sig... | 01/13/2004 |
| 6564290 | Data carrier archiving and control system In order to design a data storage unit, comprising an archive storage means for data carrier cassettes, with at least one read/write unit and a transfer unit, and further comprising a data storage control which controls the read/write unit and the transfe... | 05/13/2003 |
| 6490109 | Data storage device There is provided a data storage device concurrently allowing storage of data that can be reproduced in higher quality and storage of data that can be used also in a data transmission path with a lower transfer speed. The data storage device comprises an ... | 12/03/2002 |
| 6404584 | Analog controls housed with electronic displays for voice recorders A voice recorder including a housing having a general image display mounted therein, and further including a pressure-sensitive variable-conductance sensor for creating a varying analog value according to varying depression applied by a finger of a human ... | 06/11/2002 |
| 6392835 | Information recording medium library apparatus in which the position of the drive is fixed in the sub body of the apparatus An object of the invention of the present application is to provide an information recording medium library apparatus in which the position of the drive with respect to the main body is fixed precisely, and has a simple structure, and a low cost; in order... | 05/21/2002 |
| 6369966 | Standby signal for audio FM demodulator In order to reproduce the audio signal which has been recorded as an FM audio signal in the slanted tracks of a recording medium in tape form by means of read/write heads arranged on a rotating head drum, it is possible to use PLL circuits which are desig... | 04/09/2002 |
| 6151076 | System for phase-locking a clock to a digital audio signal embedded in a digital video signal A system for phase-locking a clock to a digital audio signal embedded within a digital video signal uses an audio extractor, frequency dividers, and an adjusted bandwidth loop filter to prevent phase jitter associated with the digital audio signal prevent... | 11/21/2000 |
| 6094102 | Frequency synthesizer using micro electro mechanical systems (MEMS) technology and method A frequency stabilizer circuit in the form of a charge-pump phase-lock loop utilizing a MEMS capacitance device, preferably a tunable MEMS capacitor or a MEMS capacitor bank, which more rapid and with a greater precision determine the phase and frequency ... | 07/25/2000 |
| 5898531 | Signal processing apparatus for digitally modulating input data Input data is modulated, a two-valued signal regarding a signal of a specific frequency is generated, and a logical arithmetic operation between the modulation data and the two-valued signal is executed. In accordance with the result of the logical arithm... | 04/27/1999 |
| 5877907 | Apparatus and method for demodulating data signals read from a recording medium An apparatus for demodulating a data signal read from a recording medium, in which data is recorded on at least a portion of the recording medium. The data is recorded using a recording system having a substantially constant linear velocity. In this manne... | 03/02/1999 |
| 5729828 | Frequency processing circuit with lower sideband suppression and emphasis A frequency processing circuit has a suppressing circuit for suppressing a lower sideband wave of an input FM signal whose frequency is modulated, a frequency conversion circuit for converting the frequency of an output of the suppressing circuit, and an ... | 03/17/1998 |
| 5715353 | Sine-wave modulator and playback/recording modulator-demodulator for a high-fidelity video playback/recording system A playback/recording modulating-demodulating device, having a voltage-controlled oscillator (VCO), a voltage-current inverter (VCI), a band-pass filter, an amplitude limiter, and a phase-locked loop. In playback mode, the playback input signal is applied ... | 02/03/1998 |
| 5694080 | Delay-type FM demodulation circuit A delay-type FM demodulation circuit of this invention has an object to satisfactorily remove a harmonic wave in an arithmetic calculation output signal even if an LPF having relatively moderate stopping characteristics is used. The delay-type FM demodula... | 12/02/1997 |
| 5655047 | Video signal frequency modulator having automatic control function and controlling method therefor A video signal frequency modulator having an automatic control function includes a reference generator for generating a sync tip level signal and a white peak level signal, a first switch for selecting one of the sync tip level signal, white peak level si... | 08/05/1997 |
| 5592132 | Frequency modulator comprising an adjusting circuit In a frequency modulator (1) having an adjusting circuit by which frequency modulator an applied luminance signal of a color video signal that contains synchronization pulses is frequency modulated, while the chrominance signal of the color video signal i... | 01/07/1997 |
| 5517159 | Frequency modulating system including feedback clamping circuit A frequency modulating system for frequency-modulating an input signal with a predetermined carrier frequency comprising a controller circuit and a frequency modulator is provided. The controller circuit includes an automatic frequency detecting circuit, ... | 05/14/1996 |
| 5506547 | Frequency modulator having LC oscillator with switchable frequencies A frequency modulation circuit which varies the resonance frequency of an LC resonance circuit, and which corresponds to the frequency modulation conversions of all TV methods with a simple constitution. Each of a plurality of passive element series circu... | 04/09/1996 |
| 5504463 | Frequency modulating system including VCD made of transconductance amplifiers A frequency modulating system for frequency-modulating an input signal with a predetermined carrier frequency comprising a controller circuit and a frequency modulator is provided. The controller circuit includes an automatic frequency detecting circuit, ... | 04/02/1996 |
| 5465071 | Information signal processing apparatus An information signal processing apparatus according to the present invention is arranged to receive as an input a frequency-modulated information signal having a predetermined frequency band, form a sample pulse signal by sampling the input frequency-mod... | 11/07/1995 |
| 5461339 | Apparatus for processing frequency modulated signals A simplified apparatus for processing frequency modulated signals is disclosed which is equipped with a frequency characteristic correction function and an inversion prevention function. An input signal is processed with different parameters within a cosi... | 10/24/1995 |
| 5442451 | Helical scan recording/reproducing device for simultaneously helically recording/reproducing both video and audio signals A video tape recorder includes a cylinder provided to rotate about its axis. A magnetic tape moves along a portion of the cylinder surface such that the cylinder surface obliquely traverses the magnetic tape. At least one pair of magnetic heads are mounte... | 08/15/1995 |
| 5432649 | Magnetic recording and reproducing apparatus A magnetic recording and reproducing apparatus wherein synchronizing separation of a reproduction video signal can be performed accurately and a stabilized reproduction video signal can be obtained. The magnetic recording and reproducing apparatus include... | 07/11/1995 |
| 5424849 | Video signal reproduction apparatus and time base correcting device The video signal reproduction apparatus having two kinds of equalizing circuits to correct the level of a frequency-modulated luminance signal, that is, a first equalizing circuit which raises the level of the upper sideband range of the frequency-modulat... | 06/13/1995 |
| 5414569 | Magnetic recording apparatus with selective recording of auxiliary audio signal An 8-mm video tape recorder receives a main audio signal which is transmitted as a monaural or stereophonic audio signal, and an auxiliary audio signal (SAP) which is selectively transmitted with the main audio signal, and records the main audio signal as... | 05/09/1995 |
| 5402277 | Audio signal reproducing apparatus An apparatus for reproducing from a recording medium a frequency-modulated audio signal which has its carrier level in a specific period determined according to the kind of information and for producing the audio signal after processing the reproduced aud... | 03/28/1995 |
| 5400149 | Magnetic recording apparatus having improved detail emphasis circuit A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is... | 03/21/1995 |
| 5396372 | Audio signal recording and reproducing apparatus There is provided an audio signal magnetic recording and reproducing apparatus in which a frequency modulated luminance signal and a frequency modulated audio signal are sequentially recorded and reproduced onto/from the same magnetic tape as recording lo... | 03/07/1995 |
