Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 8160174 | Signal detection method and receiver Disclosed is a method of detecting signals at a receiver of a communication system with a multiple input multiple output antenna. With the signal detection method, a square of the distance between a received signal vector and a channel status-considered transmission... | 04/17/2012 |
| 8135087 | Apparatus and method for signal detection using log likelihood ratio A method for signal detection using a log likelihood ratio in a multi-input multi-output communication system includes reconfiguring the signals received through the reception antennas on the basis of channel characteristics and acquiring candidate groups for each t... | 03/13/2012 |
| 8036300 | Dual loop clock recovery circuit A clock recovery circuit for digital data transmission includes a delay lock loop having a first loop which generates a phase difference signal which is indicative of a quantized phase difference between a data signal and a clock signal; and a second loop which gene... | 10/11/2011 |
| 7379742 | Multi-carrier communications with adaptive cluster configuration and switching A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating a... | 05/27/2008 |
| 7283011 | Method for performing dual phase pulse modulation A modulation method, referred to as dual phase pulse modulation (DPPM), represents digital data as a series of high and low pulses whose widths represent groups of M data bits, with both the high and low pulses representing successive M-bit groups. Each of the 2 | 10/16/2007 |
| 7276943 | Highly configurable PLL architecture for programmable logic A programmable logic device includes configurable phase-locked loop (PLL) circuitry that outputs multiple clock signals having programmable phases and frequencies. Each output signal is programmably selectable for use as an external clock, internal global clock, int... | 10/02/2007 |
| 7260151 | Dual phase pulse modulation system A system configured to transmit and receive data signals over a data link in serial fashion using dual phase pulse modulation (DPPM) is described. The data link may be, for example, a one or two wire unshielded twisted pair (UTP) cable. An exemplary system includes ... | 08/21/2007 |
| 7242740 | Digital phase-locked loop with master-slave modes A digital phase locked loop (DPLL) for providing clock synchronization in backplane bus systems has a loop filter with selectable high and low bandwidth modes. The DPLL is thus capable of respectively attenuating or tracking jitter from an input reference clock.... | 07/10/2007 |
| 7216097 | Server apparatus, transit control method, and computer-readable recording medium storing transit control program A server apparatus and a transit control method allow a noise countermeasure to be determined efficiently and conveniently in designing electronic circuits. A registered noise countermeasure information storing unit stores noise countermeasure list information reque... | 05/08/2007 |
| 7103110 | Dual phase pulse modulation encoder circuit An dual phase pulse modulation (DPPM) encoder circuit converts data into a series of high and low signal pulses, each of whose time durations or pulse widths represents a group of M data bits, with the alternating high and low pulses representing successive groups. ... | 09/05/2006 |
| 7079577 | Wide window decoder circuit for dual phase pulse modulation A dual phase pulse modulation (DPPM) decoder circuit processes a DPPM signal, which is in the form of a series of high and low pulses whose pulse widths represent successive groups of M data bits, so as to recover data carried by the signal. Each of the 2M | 07/18/2006 |
| 7057543 | Low power method and interface for generating analog waveforms A low power analog output circuit is disclosed that utilizes a low pass filter driven by a bit stream to render a waveshaped output signal based upon a raw digital data signal. The analog output circuit includes sequential bit pattern selection logic that receives a... | 06/06/2006 |
| 7051203 | Data watermarks created by using an uneven sampling period Input signals are electronically watermarked using an uneven or non-uniform sampling rate. The uneven or non-uniform sampling may be pseudo-random. The uneven or non-uniform sampling meets the Nyquist criterion so that aliasing and loss of content are avoided. The r... | 05/23/2006 |
| 6947493 | Dual phase pulse modulation decoder circuit A dual phase pulse modulation (DPPM) decoder circuit processes a DPPM signal, which is in the form of a series of high and low pulses whose pulse widths represent successive groups of M data bits, so as to recover data carried by the signal. Each of the 2M | 09/20/2005 |
| 6349116 | Data communication system harnessing frequency shift keyed magnetic field A non-propagating magnetic field-based communication system transmits and receives digital data within a limited coverage area environment. The system includes a compact transmitter unit, such as that contained in an `tracking` tag affixed to an object, a... | 02/19/2002 |
| 5789991 | FSK modulating and demodulating apparatus wherein each binary data is represented by same number of cycles of modulated signal A signal FSK-modulated with a binary data signal has first signal portions representing first logical level data contained in the binary data signal and second signal portions representing second logical level data contained in the binary data signal. Eac... | 08/04/1998 |
| 5625645 | Differential pulse encoding and decoding for binary data transmissions A differential pulse encoding and decoding approach for binary data transmissions, such as binary frequency shift keying (BFSK) data transmissions, for sending and recovering a serial, binary digital data stream by differentiating the pulses thereof. A me... | 04/29/1997 |
| 5610947 | IR FM modem with flash modulation Biphase or FM encoding is combined with Flash modulation in infrared (IR) communication. By shrinking the coded pulse width in the modulation process, power dissipation is effectively reduced to the point where FM encoding can be advantageously adapted to... | 03/11/1997 |
| 5483542 | Byte error rate test arrangement An arrangement is disclosed for determining a byte error rate (ByER) of a received digital signal. In particular, a local byte clock signal is generated and a complement of the received signal (or clock signal) is compared to the clock signal (or received... | 01/09/1996 |
| 5105444 | System for high speed data tranmission A modulator (14) and a demodulator (30) cooperate in a system (10) to communicate data at a high data rate using a pulse frequency modulation scheme (PFM). The modulator (14) receives data symbols in a FIFO memory (72) and applies the data symbols, after ... | 04/14/1992 |
| 5012478 | Monolithic multiple beam semiconductor laser A monolithic multiple beam semiconductor laser having a low power and a high power beam. A number of factors in the laser are coordinated in order to assure that both the low and high power beams operate at precisely the same frequency. The front and rear... | 04/30/1991 |
| 4926444 | Data transmission method and apparatus by period shift keying (TSK) Apparatus for transmitting and receiving a period shift keyed data stream comprises a data processor such as a microprocessor which may control the generation of the waveform as well as the determination of the bit values of an incoming signal. When the d... | 05/15/1990 |
| 4837782 | CMI decoder In a digital communication system, a CMI (Coded Mark Inversion) decoder for extracting an optimum sampling timing from a CMI coded input signal so as to NRZ (Non-Return to Zero) format the input signal. A circuit for producing clock signals which are indi... | 06/06/1989 |
| 4817116 | Digital radio communication system utilizing quadrature modulated carrier waves In order to achieve the spectrum economy and reduce the power consumption of a transmitter and reduce the error rate at a receiver and simplify receiver circuitry, at least one bit stream to be transmitted is quadrature modulated in a manner that the sign... | 03/28/1989 |
| 4700364 | FSK with continuous phase and continuous slope at bit transitions A FSK code with reduced high frequency content is generated. First through fourth waveforms are provided to a selector which selects one of the four waveforms in accordance with a control signal which, in turn, is generated in accordance with a state indi... | 10/13/1987 |
| 4691341 | Method of transferring digital information and street lighting control system Remote control of street lights utilizes a programmable computer which generates wavelike control signals at fundamental frequencies in the voice range and having half periods corresponding in time-duration to the pulses used for binary digits in logic ci... | 09/01/1987 |
| 4561098 | Receiver for FFSK modulated data signals A receiver for FFSK modulated signals operating in the time domain so as to effect a rapid acquisition of the data signal and the generated clock signal and to maintain the synchronization irrespective of the data pattern. For that purpose the receiver co... | 12/24/1985 |
| 4475244 | Time-period modulation transmission system A system for time-period modulating (TPM) a subcarrier in accordance with the amplitude of an input signal includes generating a ramp signal of constant slope, comparing the ramp signal with the input signal, and resetting the ramp signal when the ramp si... | 10/02/1984 |
| 4464766 | Radio transmission system for binary coded signals Binary digits of one kind are each converted into a single, complete sinusoidal oscillation of a lower frequency, and binary digits of the other kind are each converted into a train consisting of an oscillation packet of a higher frequency and a single, c... | 08/07/1984 |
| 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 |
| 4314370 | Wireless intercommunication system An intercommunication system for the wireless transmission of speech, employing ternary delta modulation, wherein, for the purpose of asynchronous ternary delta modulation, the delta modulator and demodulator of each subscriber is connected via a modem to... | 02/02/1982 |
| 4287596 | Data recovery system for use with a high speed serial link between two subsystems in a data processing system A data recovery circuit for use in a data processing system where plural subsystems are linked by a bit serial transmission line. The data transmitted over the bit serial transmission line is in the form of a phase encoded (PE) pulse signal. The data reco... | 09/01/1981 |
| 4066841 | Data transmitting systems It is important that a data transmission system should be fast, utilize a minimum of band width and be accurate in the presence of high noise levels. The invention provides a frequency shift keying data transmission system for transmission of binary coded... | 01/03/1978 |
