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| Number | Title | Issue Date |
| 7369067 | Optical coupled type isolation circuit In an optical coupled isolation circuit, a PWM encoder encodes a one-bit binary data signal supplied from a sigma-delta analog-digital converter in synchronization with a clock signal of a cycle T to produce a pulse width modulation signal. The pulse width modulatio... | 05/06/2008 |
| 7324589 | Method and system for providing error compensation to a signal using feedback control A method for providing error compensation to a signal includes providing error adjustment to a signal at a transmitter and communicating the signal over a channel at a channel speed. The method includes receiving the signal from the channel at the channel speed and ... | 01/29/2008 |
| 7280061 | Digital-to-analog converter using a frequency hopping clock generator Method and device for reducing the signal images at the output of a digital/analog converter. In a method for reducing the signal images at the output of a digital/analog converter, a frequency hopping clock generator provides a digital data signal whose data rate i... | 10/09/2007 |
| 7072416 | Transmitting/receiving device and transmitting/receiving method In a modulation method such as 8PSK or a 16PSK in which a sender device expresses a symbol by using three or more bits, important information is arranged at least at only one of the first and second bits, a receiver device extracts the important information from at ... | 07/04/2006 |
| 6933866 | Variable data rate receiver A clock signal and data is recovered from a variable rate signal including biphase mark encoded digital audio data. Such recovery involves regularly determining a minimum or maximum pulse width in the biphase mark encoded digital audio data using a high frequency cl... | 08/23/2005 |
| 6778108 | Method and apparatus for compression of binary data The invention is a method and apparatus for compression of binary data. The signal is used before modulation to increase the effective transmission rate by compressing it prior to being encoded onto a magnetic tape or other storage media. The transition bits of the ... | 08/17/2004 |
| 6757342 | Data demodulation A data demodulating technique for binary data defined by a pulse code modulated signal. The technique involves digitizing the data signal read by a magnetic head from the stripe of a magnetic card. The time interval between peaks in the digitized signal is determine... | 06/29/2004 |
| 6567487 | Method for the sampling of biphase coded digital signals The invention relates to a method for the sampling of biphase coded digital signals by reception means which have at least one signal input having switchable signal edge sensitivity or at least two signal inputs having different signal edge sensitivity fo... | 05/20/2003 |
| 6476743 | Magnetic stripe reader A method for decoding information contained in a waveform having a series of peaks is disclosed which is particularly directed to a method for reading a magnetic stripe for example on a card that allows the information on the stripe to be read without the... | 11/05/2002 |
| 6400288 | Method and apparatus for generating code words with shifted tribit error protection An encoder is provided that converts data words into code words. The code words, when concatenated together, are such that sub-strings of consecutive first symbols in the code words have no more symbols than a maximum number; sub-strings having the maximu... | 06/04/2002 |
| 6097322 | Device and method for controlling the sampling of a signal conveying binary information coded according to a two-phase code A device including a mechanism (4) for generating a counting clock signal (CKM) whose frequency is less than or equal to n times twice the transmission frequency. The device also includes a detection mechanism (10) for detecting the transitions (TD) of th... | 08/01/2000 |
| 5754587 | Method and apparatus for bias suppression in a VCO based FM transmission system A method and apparatus for bias suppression which includes a transmitter having a bias suppression encoder and a closed-loop VCO FM modulator and a receiver having a bias suppression decoder and an AC coupled FM demodulator. The bias suppression encoder g... | 05/19/1998 |
| 5466920 | Real time decoding for card transaction terminal Real time decoding methods and apparatus for a card transaction terminal used for reading a magnetic stripe on a data card. The method is implemented in a microcomputer employed in the terminal. The data decode method for the microcomputer decodes data in... | 11/14/1995 |
| 5446765 | Apparatus for recovering data and clock information from an encoded serial data stream The invention doubles the bit rate for a given media bandwidth as compared to, for example, Manchester encoding. It is applicable to serial transmission or storage of digital data. An arbitrary NRZ data stream is first encoded by a pre-encoding method, su... | 08/29/1995 |
| 5379037 | Apparatus for decoding degraded data signals A two-frequency data signal, also known as a biphase or F/2 F signal, is accurately decoded by sampling the signal and digitizing the samples to provide a series of digital values representing the signal. An intelligent digital filter manipulates the digi... | 01/03/1995 |
| 5298897 | Method and apparatus for decoding two frequency (f/sf) data signals A two-frequency data signal, also known as a biphase or F/2F signal, is accurately decoded by sampling the signal and digitizing the samples to provide a series of digital values representing the signal. An intelligent digital filter manipulates the digit... | 03/29/1994 |
| 5168275 | Method and apparatus for decoding two frequency (F/2F) data signals A two-frequency data signal, also known as a biphase or F/2F signal, is accurately decoded by sampling the signal and digitizing the samples to provide a series of digital values representing the signal. An intelligent digital filter manipulates the digit... | 12/01/1992 |
| 4876697 | Three-part decoder circuit Novel electrical circuits suitable for decoding an encoded binary data stream. The electrical circuits include digital circuitry, and are preferably employed to decode magnetic information or optical information. The information has been encoded in a thre... | 10/24/1989 |
| 4757520 | FM signal demodulating apparatus A FM signal demodulating apparatus with a timing pulse generator with a fixed periodic interval, a pulse deletion gate circuit whose pulse deletion ratio in a train of successive timing pulses being set in the range of 0.4 to 0.16, a edge pulse generator,... | 07/12/1988 |
| 4547764 | Pulse width decoder for double frequency encoded serial data Disclosed is a pulse width decoder which receives a double frequency modulated (DFM) waveform and recovers therefrom the contained NRZ-L data and clock information. Basically, the decoder looks for long and short pulses in the DFM waveform. A long pulse i... | 10/15/1985 |
| 4453157 | Bi-phase space code data signal reproducing circuit A bi-phase space code data signal reproducing circuit comprises a clock pulse supplying circuit for supplying a clock pulse having a period which is 1/N (N is an integer) of a bit period T of a bi-phase space code data signal to be reproduced, a shift reg... | 06/05/1984 |
| 4441193 | Frequency-encoding circuit for reducing distortion An electronic circuit produces a composite signal in which a low frequency component signal is followed by a high frequency component signal such that the composite signal resists transmission line distortion. To that end, the circuit generates the half-c... | 04/03/1984 |
| 4389636 | Encoding/decoding syncronization technique A non-binary digital encoding/decoding process wherein the serial bits to be transferred are encoded into a stream of complementary-bit-pairs, a predetermined bit of each pair corresponding to an original information bit, and the other bit of the pair bei... | 06/21/1983 |
| 4017803 | Data recovery system resistant to frequency deviations The data stream input to the recovery logic is taken from a point at which its transitions are timecoincident with those of the data stream input to the phase comparator of the phase locked oscillator loop used to control the generation of the recovery wi... | 04/12/1977 |
| 3967061 | Method and apparatus for recovering data and clock information in a self-clocking data stream A method and apparatus is described for receiving a data stream incorporating a self-clocking Manchester code. The data stream is applied to monostable multivibrators which produce pulses at each positive-going and negative-going transition in the voltage... | 06/29/1976 |
| 3967062 | Method and apparatus for encoding data and clock information in a self-clocking data stream A method and apparatus is described for generating a data stream incorporating a self-clocking Manchester type code. The data, originally stored in a shift register, is shifted out of the register in bi-level form with a first voltage level representing o... | 06/29/1976 |
| 3938187 | System for putting an information record onto a magnetic substrate An information recording system comprises a peripheral control unit for recording bits of a character one at a time coincident with the middle of a record time interval. The peripheral control unit is responsive to a central unit which cyclically transmit... | 02/10/1976 |
