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7577894 |
Apparatus and method for judging the legitimacy of transfer data
When a plurality of data blocks are divided into a plurality of frames and the divided frames are transmitted, every time a frame is received, a interim calculation result of a check code is...
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7552380 |
Method and apparatus for encoding and decoding modulation code
A method and an apparatus for encoding and decoding a modulation code are provided. The method includes: adding an error detection bit(s) to source information; performing k-constraint coding by...
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7496824 |
Data recording device and method, data reproduction device and method, information recording medium, program-containing medium, and program
A data-recording/reproducing apparatus and method, that determine a reproduction position with high degree of reliability for data recorded on an information-recording medium even after the data is...
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7496738 |
Method of automatic control of the execution of a program by a microprocessor
A method and a circuit of automatic control of the execution of a program by a microprocessor, including: assigning a digital decrement or increment to at least one function of the program;...
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7392464 |
Universal parity encoder
A data encoding system for a data stream comprises an interleaving module that receives the data stream as N bit data blocks and that reverses positions of at least two of the N bits of selected...
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7290203 |
Dynamic memory architecture employing passive expiration of data
Apparatus for passively tracking expired data in a dynamic memory includes an error encoding circuit operative to receive an input data word and to generate an encoded data word which is stored in...
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7242325 |
Error correction compensating ones or zeros string suppression
An error correction compensating ones or zeros string suppression system and method for use in a digital transmission system is herein disclosed. In digital transmission systems utilizing error...
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7243297 |
Method for bit recovery in an asymmetric data channel
A demodulator performs bit recovery in an asymmetric data channel, such as an optical recording media, by detecting runlength violations prior to demodulation, and correcting the detected runlength...
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7149955 |
Encoding and decoding apparatus and method with hamming weight enhancement
A Hamming weight encoder includes an input that receives user data including P symbols and a Hamming weight module that determines a Hamming weight of N of said P symbols. N and P are integers...
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7149956 |
Converging error-recovery for multi-bit-incrementing gray code
An L-bit gray-code input value can change by more N bits at a time. The lower N bits of the input are stored as a received least-significant-bits (LSB) while the upper bits are stored as a received...
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7013422 |
Noise removal in multibyte text encodings using statistical models
Disclosed is a method of validating a byte sequence having a plurality of states, the method comprising designating one or more noise states from among the plurality of states; generating a most...
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6977970 |
Data reproducing apparatus and method for improving detection performance by adjusting decision levels used in data detector
A data reproducing apparatus and method for improving data detection performance by adjusting decision levels used in a data detector. The data reproducing apparatus includes an equalizer which...
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6732320 |
Method and system for improved error correction in optical media data processing
The present invention provides a method and system for error correction in optical media data processing. The method includes demodulating a data using a conversion table; marking errors which...
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6622284 |
Method and apparatus for detection of errors in one-hot words
Disclosed is an apparatus and method for detecting errors in one-hot words, which have only a single bit set in the absence of errors. The apparatus comprises a plurality of input signal lines, a...
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6604224 |
Method of performing content integrity analysis of a data stream
A method providing integrity analysis of content data streams within an information distribution system. On-demand content is divided into a plurality of content portions to be severally...
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6430230 |
Methods of encoding payload bits for transmission
In a method for encoding payload bits for transmission over communications link, data and control information are assembled into n-bit data words, where n is an even number and words for control...
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6275967 |
Optical disk drive using y0+y1 signal detection
The present invention implements a maximum likelihood detector for optical disk drive without using a Viterbi detector. The detection algorithm that includes y0+y1 detection is very simple by...
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6233289 |
High rate trellis code for partial response channels
Signals indicative of unencoded input data are encoded into a plurality of encoded sequences. A first subset of the plurality of encoded sequences are encoded according to a k constrained code of...
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6079045 |
Transmission system and recording system having a simplified symbol detector
In a transmission system or recording system, a detector (16,30) using quality measures indicating the quality of the received signal is applied. In contradistinction with the prior art system the...
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6003154 |
System and method for covering illegal states in a programmable gate array
A programmable gate array (PGA) according to the present invention includes a plurality of state machine logic blocks and a plurality of error detecting logic blocks. Each state machine logic block...
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5950150 |
Fire/life safety system operation criteria compliance verification system and method
A system and method for operational criteria compliance verification of fire/life safety systems and components whose operation, maintenance and testing are established by predetermined operational...
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5942001 |
Information processing apparatus
Channel data obtained from a reproduced signal is input to a demodulation ROM as an address and demodulated. In the demodulated channel data, the data whose data pattern is not consistent with a...
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5894486 |
Coding/decoding apparatus
A coding/decoding apparatus for high-speed and reliable detection of even an error which has occurred in the compressing division or between the compressing division and the error correcting...
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5862161 |
Sampled amplitude read channel with simplified sequence detector matched to partial erasure
This invention provides apparatus for reliably and efficiently reading data from a magnetic storage medium under the condition that adjacent magnetization regions are partially erased. A simplified...
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5802081 |
Digital information modulating apparatus
Information is divided into first blocks each having m bits, and n bit or bits in each of S different states are added to a head of each of the first blocks to change the first block into S second...
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5768630 |
Apparatus for receiving and transmitting a serial data
A receiving and transmitting apparatus of a serial data has a transmission rate as fast as that of a communication apparatus of parallel data. The present invention compresses and transmits a...
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5748649 |
System enabling a magnetic code recorded on a magnetic track to be properly decoded in the form of a binary message
The magnetic code may include a run of b spoiled bits in a position that is locatable. The system consists in adding a check structure of k bits to the m-bit message in such a manner that the...
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5703889 |
High efficiency coding signal processing apparatus with error propagation influence reduction
According to a high efficiency coding signal processing apparatus of the present invention, in order to suppress error propagation, effectively correct errors, and reduce a signal deterioration...
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5682405 |
Ones density monitor
A ones bit density monitor is disclosed which is comprised of a 31-bit shift register, a counter, and a clock circuit having logic to preclude the number representing a number of pulses within the...
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5675569 |
Readback circuit for an optical information reading and recording apparatus
A recorded signal reproduction circuit in an optical disc information reading and recording apparatus converts a recorded signal recovered from an optical disc to PR (1, 2, 1) characteristics...
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5673130 |
Circuit and method of encoding and decoding digital data transmitted along optical fibers
A data transmitter (12) transmits parallel data as light pulses over multiple optical channels (14). A data receiver (16) converts the light pulses back to a voltage level and compares the voltage...
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5506870 |
Signal acquisition detection method
A method of detecting whether a valid DS1 signal is being received by a receiver. If the receiver does not have a valid signal (loss of signal), then the receiver reads consecutive fixed sized N...
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5438621 |
DC-free line code and bit and frame synchronization for arbitrary data transmission
A method of encoding data for transmission over a communication link. A cumulative polarity of previously-transmitted frames is maintained. A frame is prepared for transmission by combining a data...
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5434886 |
Digital communication system
A digital communications system suitable for high-speed data transmission includes a transmitter and a receiver providing the ability to selectively switch between multiple coding and decoding...
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5396503 |
Method and system for communicating data
Data to be communicated over a plurality of channels is divided into blocks (A1,B1,C1,D1,A2,B2, . . . ), and each successive block is transmitted along a different channel (A,B,C,D) on a cyclic...
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5390195 |
Miller-squared decoder with erasure flag output
A method and apparatus for the generation of a signal flag in response to illegal channel code patterns from an information channel, the signal flag may typically be used as an erasure flag by a...
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5384790 |
Magnetic recording system with pulse qualification and error correction circuitry
Special tape drive read circuitry generally qualifies read voltage peaks by establishing a minimum amplitude for valid peaks in the read voltage signal so that noise is not interpreted as peaks,...
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5373513 |
Shift correction code system for correcting additive errors and synchronization slips
In a shift correction decoder which processes d,k-constrained RLL data that is encoded in accordance with a shift correction code whose symbols in GF(p) comprise modulo p reductions of cumulative...
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5357524 |
Apparatus for converting a digital signal
A maximum likelihood decoder (28) comprises a Viterbi decoding unit (30) and a symbol concluding unit (29). Final N-M bit data of data of N (>M) bit unit, to which M-bit original data is...
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5325376 |
Communication system for detecting a communication error in information transmitted between a plurality of units and a main control unit
A communication system includes a main control unit controlling a plurality of units, a transmitter for transmitting information between the main control unit and the plurality of units, and an...
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5251220 |
Method and apparatus for error detection and processing
An Off-premises CATV system having an interdiction apparatus includes a remote microprocessor which receives commands and data from the headend over the cable distribution plant. The data is in a...
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5249186 |
Apparatus for detecting the start of frame in bipolar transmission systems
Apparatus is provided to provide a start of frame signal for an incoming bipolar information signal wherein one binary state is alternately encoded with positive and negative level pulses, each of...
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5162791 |
Collision detection using code rule violations of the Manchester code
A collision detection method and apparatus is disclosed for detecting code rule violations in Manchester encoded data packets. The signals δ 0 =S 2n -S 2n -1 δ 1 =S 2n +1 -S 2n δ 2 =S...
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5095484 |
Phase invariant rate 8/10 matched spectral null code for PRML
A method for coding a binary data string for a partial-response channel having a transfer function with a spectral null at zero frequency to provide a coding rate 8/10 and an output which is...
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5022051 |
DC-free line code for arbitrary data transmission
Means and structure for encoding binary data ensures that, on average, the encoded data provides a balanced data stream having an equal number of logical one and logical zero bits. An indicator bit...
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5016258 |
Digital modulator and demodulator
A digital modulator converts M-bit data words to N-bit code words (N>M) each containing a specific number of bits `1`. The specific number is one of a plurality of predetermined numbers which...
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4975916 |
Character snychronization
A system for bit character synchronization of an 8/10 bit code being deserialized is provided by a deserializer with a skip bit function input used to move a character boundary one bit at a time,...
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4943965 |
Digital signal decoding method and circuit therefor
A digital signal decoding method and a circuit therefor which, when each data of first and second 1-bit of a set of 3-bit data received is a logical "1", decodes the data to 1-bit data of "1". When...
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4939735 |
Information handling system having serial channel to control unit link
An information handling system includes a processor with one or more channels for communicating to peripheral devices controlled by peripheral device controllers, and one or more serial data links...
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4933672 |
Data transmission system with a digital alarm facility
The data transmission system includes a data transmitter for transmitting either data bits or a sequence of N alarm bits in a first binary state. The transmitter includes a decode circuit (16)...
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