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| Number | Title | Issue Date |
| 8184738 | Clock reproducing apparatus and method A common mode of a waveform of a duobinary transmission signal (IN) is set to 0 and the size of a data eye is set to Veye; and reference potentials Vref_H and Vref_L are set to the following values: Veye/√{square root over (3)}≦Vrefâ... | 05/22/2012 |
| 7508882 | Electrical backplane transmission using duobinary signaling A (binary) signal is transmitted through an electrical backplane, and the received signal is interpreted as a duobinary signal. In order to ensure that the received signal can be properly interpreted as a duobinary signal, the data signal is preferably filtered prio... | 03/24/2009 |
| 7333553 | Tunable duobinary transmitter An apparatus and method for tunably delaying a signal and using that delayed signal in a duobinary transmitter is described. The transmitted duobinary signal is representative of the binary signal, and is formed by, among other things, introducing into a copy of the... | 02/19/2008 |
| 7302019 | Maximum likelihood decoding method and maximum likelihood decoder A maximum likelihood decoder includes metric generators for generating metrics based on a plurality of partial responses and a Viterbi decoder for realizing maximum likelihood decoding by using a synthetic metric generated by synthesizing the metrics. A first partia... | 11/27/2007 |
| 7127665 | Trellis code detector and decoder The present invention is to reduce the maximum magnetization reversal interval of a trellis code. A trellis diagram for the trellis code takes into consideration a constraint condition on the DSV of a code and an inter-symbol-interference for three bits. The minimum... | 10/24/2006 |
| 7072414 | Gaussian minimum shift keying (GMSK) precoding communication method A premodulation precoding method precodes a data sequence in a Gaussian minimum shift keying (GMSK) modulator to improve the bit error rate performance of a coherent Viterbi receivers generating estimates of the communicated data sequence without the use of differen... | 07/04/2006 |
| 6970522 | Data retrieval A digital data storage (DDS) system for reading DDS tapes employs a partial response maximum likelihood detection system which utilises redundancy in the 8-10 DC free modulation encoding to reduce low frequency noise. The system incorporates a time-varying trellis d... | 11/29/2005 |
| 6970520 | Methods and systems for accumulating metrics generated by a sequence estimation algorithm Radiocommunication systems, methods and terminals are described wherein metrics associated with MLSE detecting techniques, e.g., using the Viterbi algorithm, are accumulated in a manner which is less computationally intensive than conventional techniques. The delta ... | 11/29/2005 |
| 6901119 | Method and apparatus for implementing soft-input/soft-output iterative detectors/decoders A method and apparatus are provided for implementing soft-input soft-output iterative detectors/decoders. Soft-input information is added directly to incoming channel samples. Input signals comprising the received incoming channel samples with the added soft-input i... | 05/31/2005 |
| 6595707 | Code conversion circuit for optical duobinary transmission and optical transmitter and receiver using same A code conversion circuit provided with a bit distributing unit for dividing a high speed input signal into N ways of low speed signals, N number of code converters for performing code conversion on the N ways of low speed signals, and a bit combining uni... | 07/22/2003 |
| 6466627 | Pulse signal transmitting circuit and subscriber's line terminal apparatus using the pulse signal transmitting circuit A pulse signal transmitting circuit generates a pulse signal having an enhanced high-frequency component with a reduced power loss. A pulse signal is transmitted to a load circuit through a transmission cable connected to a secondary winding of a transfor... | 10/15/2002 |
| 6388786 | Method for generating duobinary signal and optical transmitter using the same method Disclosed is a method for generating a duobinary signal which has the step of: modulating individually an intensity and a phase of a carrier wave. Also disclosed is a duobinary-manner optical transmitter which has: a laser device which outpus signal light... | 05/14/2002 |
| 6377635 | Method and apparatus for viterbi detection of generalized partial response signals using partial matched filter and matched filter metrics Methods and apparatus are provided for implementing high-speed and area efficient architectures for Viterbi detection of generalized partial response signals using both partial matched filter and matched filter metrics. In the method of the invention, bra... | 04/23/2002 |
| 6337756 | Optical transmitter system and method The present invention relates to an optical duobinary transmitter system and method using optical intensity modulation. The system comprises an input terminal (51) arranged to receive a first binary signal, a driving circuit (53) connected to the input te... | 01/08/2002 |
| 6104765 | Asymmetric channel data detection compensation A data symbol sequence detector for choosing data symbol sequences likely to be represented by corresponding sequences of samples received by the detector with these sample sequences formed by sampling data signals obtained from magnetically stored data t... | 08/15/2000 |
| 6097525 | Method for generating duobinary signal and optical transmitter using the same method Disclosed is a method for generating a duobinary signal which has the step of: modulating individually an intensity and a phase of a carrier wave. Also disclosed is a duobinary-manner optical transmitter which has: a laser device which outputs signal ligh... | 08/01/2000 |
| 5917638 | Duo-binary signal encoding Apparatus for implementing the application of duo-binary signal encoding in high-power, high-speed transmission systems which may be employed to mitigate the problem of stimulated Brillouin scattering. A dual-drive Mach-Zehnder interferometer modulator is... | 06/29/1999 |
| 5543952 | Optical transmission system In a transmitter side in an optical transmission system, an input binary signal is converted into a duobinary signal, and the duobinary signal is applied to an optical modulation device which provides an optical intensity modulation signal, wherein the op... | 08/06/1996 |
| 5130862 | Coding apparatus for converting digital signals into ternary signals whose DC component is equal to zero By transforming a duobinary signal, a value of -1 cannot appear again after a value of zero following -1 as shown in a string of -1.fwdarw.0.fwdarw.-1 and a value of 1 cannot appear again after a value of zero following 1 as shown in a string of 1.fwdarw.... | 07/14/1992 |
| 5119402 | Method and apparatus for transmission of local area network signals over unshielded twisted pairs Apparatus, and a related method for its operation, for transmitting binary data at high speed through unshielded twisted pairs of conductors intended for a much lower data speed and bandwidth. By using a combination of demultiplexing into multiple data ch... | 06/02/1992 |
| 5081653 | Automatic gain control circuit for multilevel duobinary AM/PSK modulated signals An automatic gain control circuit for multilevel duobinary AM/PSK (amplitude modulation/phase shift keying) signals allows multilevel modulated signals to be received accurately. The circuit includes an amplifier that is controlled such that during a prea... | 01/14/1992 |
| 4866736 | Data transmission system comprising a decision feedback equalizer and using partial-response techniques A system for transmitting an n-level data signal (dk) at a given symbol rate 1/T comprises a data transmitter (1), a transmission channel (2) and a data receiver (3) with an equalizer (30) of the decision feedback type. By arranging this equali... | 09/12/1989 |
| 4860310 | Duobinary encoded signal decoder A device for decoding a transmitted sequence of duobinary encoded signals, which provides as an output a sequence of binary signals which most probably matches the transmitted sequence of duobinary encoded signals, estimated as a function of the duobinary... | 08/22/1989 |
| 4720839 | Efficiency data transmission technique Partial response and quadrature partial response data transmission system characterized by increased transmission rate, lower signal-to-noise ratio, low cost and simpler hardware implementation than prior art systems. A steep filter (almost rectangular) i... | 01/19/1988 |
| 4677627 | Error correction scheme An error correcting scheme for processing data which is transmitted on a broadband and/or CATV network and utilizes the IEEE 802.4 three-level duobinary AM/PSK (phase shift keying) coding format. The error correcting scheme utilizes two thresholders. One ... | 06/30/1987 |
| 4644564 | Decoding the output signal of a partial-response class-IV communication or recording device channel A maximum-likelihood sequence decoder is used with a partial-response signaling system for processing sequences of sampled values from a communication channel or recording device. The partial-response signals can be duobinary, dicode, or partial-response ... | 02/17/1987 |
| 4618941 | Apparatus and method for generating filtered multilevel data from NRZ data An embodiment of the invention includes a binary linear phase response filter having a plurality of weighted outputs and a summing circuit which sums groups of the weighted outputs. A polarity inverting mechanism is provided for selectively changing the p... | 10/21/1986 |
| 4571734 | Method and apparatus for decoding the output signal of a partial-response class-IV communication or recording-device channel A maximum-likelihood sequence decoder is used with a partial-response signaling system for processing sequences of sampled values from a communication channel or recording device. The partial-response signals can be duobinary, dicode, or partial-response ... | 02/18/1986 |
| 4472813 | Transmission system for intentionally violating a class IV partial response code to distinguish subsidiary signals from an error In a transmission system of a class IV partial response code succession produced in accordance with a predetermined encoding rule, a transmitter intentionally violates the encoding rule to carry a subsidiary signal, so that an intentional violation appear... | 09/18/1984 |
| 4426710 | Processes for generating duo-binary FSK, tamed FSK and TFM modulations and modulators applying those processes To obtain a duo-binary FSK modulation, the modulating binary signal train has a three state partial response and is fed through a precoding, a transition-type coding, a simplified MSK modulation at the carrier frequency, a frequency division by two, and a... | 01/17/1984 |
| 4406009 | Method and apparatus for converting binary information into a single-sideband 3-level correlative signal A transmitter converts an incoming bit stream into a single-sideband signal for transmission over a band-limited channel such as a digital radio. The incoming bit stream is digitally processed to obtain both in-phase and quadrature-phase 3-level correlati... | 09/20/1983 |
| 4112263 | Modified duobinary regenerative repeater testing arrangement Modified duobinary regenerative repeaters are tested in situ by means of a pulse pattern generator connected to the repeatered span line, a plurality of audio filters, one at each repeater site, a return transmission path and a measuring device for determ... | 09/05/1978 |
| 4086566 | Error detector for modified duobinary signals A modified duobinary signal is separated into two (odd and even) pulse trains, each of which is representative of a bipolar pulse train. Each representative bipolar pulse train has a bit rate one-half that of the modified duobinary signal. Violations of t... | 04/25/1978 |
| 4078157 | Method and apparatus for regenerating a modified duobinary signal In PCM transmission, it is well known to transmit 24 voice-grade channels at a bit rate of 1.544 Megabits per second (Mb/s). The number of channels which may be transmitted in about the same bandwidth is doubled by the use of correlative level coding, suc... | 03/07/1978 |
| 4078159 | Modified duobinary repeatered span line An end-office repeater accepts a high-speed bipolar signal, converts the bipolar signal into a unipolar signal, scrambles the unipolar signal, and encodes the scrambled unipolar signal into a modified duobinary signal for transmission over a cable pair. B... | 03/07/1978 |
| 3993953 | Apparatus and method for digitally generating a modified duobinary signal A binary signal is first digitally transformed to obtain both an altered binary signal and its complement. The altered and altered complementary signals are next each delayed by two bit intervals of the original waveform to obtain both delayed altered and... | 11/23/1976 |
