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8958502 Transmitter and method for transmitting data block in wireless communication system  
Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: encoding an information bit and generating a...
8744082 System and method for securing wireless communications  
A system and method for securing wireless communications are provided. A method for secure communications by a first user includes estimating a channel between the first user and a second user...
8369972 Methods and apparatus to perform audio watermarking and watermark detection and extraction  
Encoding and decoding methods and apparatus as described. In one example, a method of embedding auxiliary information into an audio signal includes sampling the audio signal to create an audio...
8295416 Noise-canceling frequency-to-digital converters  
Methods and apparatuses for reducing noise in frequency to digital converters (FDCs). An FDC apparatus includes a first FDC, a second FDC and a combiner. The first and second FDCs are configured...
8276038 Data storage systems  
A data storage system includes an encoder subsystem comprising an error correction code encoder, a modulation encoder, and a precoder, and a decoder subsystem similarly comprising a detector, an...
8237980 Serial interface device and image forming apparatus  
A serial I/F has: a FIFO portion to which m- or n-bit (m
8232902 Pulse modulation devices and methods  
An embodiment method of generating an output pulse stream comprises first pulse modulating a first multi-bit input term to generate a first one-bit pulse stream, using a bitwise logic AND to...
8032362 Audio signal encoding/decoding method and apparatus  
Provided is an audio signal encoding method including transforming an input signal from a time domain to a time/frequency domain using a first transformation method, extracting a stereo parameter...
7656320 Difference coding adaptive context model using counting  
Techniques for improving encoding and decoding data are described herein. According to one embodiment, it is determined whether a current context can encode a retrieved symbol. The current context...
7075434 Encoding and decoding method and system  
In a method and apparatus for encoding a tag with an n-bit binary code one or more predetermined frequency sources are associated with the tag that produce known different respective...
6870492 Method of near-unity fractional sampling rate alteration for high fidelity digital audio  
The present invention provides an efficient method for near-unity sampling rate alteration in high performance applications, such as CD to DAT conversion. Specifically, the input digital signal is...
6583654 Clock synchronization device  
A clock synchronization device is disclosed that includes a phase detecting unit for detecting a phase difference between an external clock signal and an internal clock signal, a binary code...
6476735 Method of encoding bits using a plurality of frequencies  
A digital encoding system for encoding a series of input bits into a plurality of frequencies, includes an encoder for generating a sampled representation of the frequencies corresponding to an...
6404357 Digital/analogue communication system for increasing transfer efficiency of digital sample data  
A digital/analogue communication system is described, where data is generated and received by a processing unit in a digital format and transmitted via a communication path in an analogue format....
6204942 Demultiplexing with clocked optical receivers  
An optical demultiplexer demultiplexes an N channel multiplexed optical data signal, at a first data rate, into N signal data channels. The demultiplexing is provided by N optical receivers, each...
6175316 Bin-to-bin differential encoding apparatus and method for a discrete multi-tone transmission system  
A discrete multi-tone communication system employing bin-to-bin differential encoding of data frames to be transmitted within the communication system. The bin-to-bin differential encoding...
6107945 Correlated sampled area detector  
A data capture circuit includes a character detection circuit and a word detection circuit. The character detection circuit determines values for characters represented by a signal having a...
5754127 Information encoding method and apparatus, and information decoding method and apparatus  
In this invention, in the case of transforming an input waveform signal into frequency components at a frequency component decomposing circuit 701 to allow the frequency components from the...
5548574 Apparatus for high-speed recording compressed digital audio data with two dimensional blocks and its compressing parameters  
Methods and apparatus for recording, reproducing, transmitting and/or receiving compressed data, and a recording medium therefor, utilize frequency dividing filters for dividing the frequency...
5454006 Method and apparatus for bandwidth limited binary signals  
In a method for limiting the bandwidth of a selected binary signal (B), there is produced a modulated digital signal (D) which presents a continuous series of changes in signal level. The two...
5119093 Apparatus for converting a signal of a first sample rate into a signal of a second sample rate  
Sample values of a digital signal of a first sample rate are supplied to a digital filter for conversion into a digital signal of a second sample rate. The coefficients of the digital filter are...
4990911 Sampling frequency converter  
A relatively simplified sampling frequency converter for use in a format conversion apparatus is operative to convert sampled input data of an input sampling frequency into sampled output data of...
4816829 Method of and apparatus for converting digital data between data formats  
A method of and apparatus for converting between first and second digital data formats is disclosed whereby digital words of the first format are analyzed to detect an upper bandwidth limit of a...
4602131 Touch tone decoder  
A programmable tone decoder for standard bell system DTMF tone pairs is presented which comprises an integrated DTMF receiver and a means for programming a sequence of digits which are compared to...
4503291 Repertory dialer with efficient data storage  
Method and apparatus are provided for microprocessor controlled storage and dialing of telephone numbers and storage and access of associated data. Each entry includes a telephone number field and...
4473820 Signal decoder for converting a co-directional 64 kbit/s interface signal into a binary information signal, a 64 KHZ clock and an 8 KHZ clock  
A signal decoder converts a co-directional 64 kbit/s interface signal which is divided into half waves into a binary information signal, a 64 kHz clock and an 8 kHz clock. A circuit arrangement is...
4425666 Data encoding and decoding communication system for three frequency FSK modulation and method therefor  
A system for three frequency FSK modulation wherein binary data bits are sequentially encoded into a ternary system of channels designated "1", "0" and "C", so that a data bit is encoded and...
4042787 Output processing and output coupling circuit for a digital tone receiver  
A circuit is provided to convert a set of mutually exclusive digital signals representing presence or absence of individual tones of a Dual Tone Multiple Frequency (DTMF), or 2-of-8 signal, system...
4039959 Two-tone decoder having high noise immunity  
A decoder for converting a frequency coded digital input signal into a binary output signal. The decoder includes circuitry which detects when the input signal consists of the proper tones. When...
4028501 Method and apparatus for translating multiple frequency signalling  
A multiple frequency signalling receiver translates combinations of tone signals received from a telephone set to derive binary two out of eight coded signalling. Received signals are directed by...
4025865 Frequency-signalling circuit for a telephone  
A frequency signaling circuit includes a plurality of channels, each channel having division means for frequency division of a clock signal, the division ratio being selected in accordance with...
4000371 Facsimile transmission method and system  
Two facsimile devices, each capable of operating in a plurality of communication modes and having at least one common communication mode are connected together by a telephone line. One of the...
3990071 Data transmission system using frequency permutation codes  
A data transmission system is disclosed in which the information to be transmitted comprises a plurality of unit information pieces each of which in turn is indicated by a numerical code of a...
3976996 Conversion of FSK to NRZ coding  
Circuit and method for converting FSK recorded data to NRZ by measuring time intervals between signals transitions of the same polarity.
3912869 Multifrequency-to-digital converter  
A multifrequency-to-digital converter for converting a two-tone multifrequency signal into a digital signal representing the multifrequency signal is disclosed. The incoming multifrequency signal...
3763322 DIGITAL-TO-TONE CONVERTER UTILIZING A RELAXATION OSCILLATOR  
A relaxation oscillator is formed by a Schmitt trigger circuit and an operational integrator circuit interconnected to form an oscillatory feedback loop. A diode switching network is constructed...
3757309 ENCODER DEVICE FOR RECORDING DATA ON A MAGNETIC TAPE  
In the device, data characters to be recorded on a magnetic tape are converted into decimal numbers in code form by an encoder circuit and stored in a block unit in a memory circuit, and the...
3750148 PULSE CODING SYSTEM  
An encoder and cooperating decoder for the individual bits of serial binary information designed to increase the difficulty of jamming a communication system. In the encoder, the digital signal is...
3654492 CODE COMMUNICATION FRAME SYNCHRONIZATION SYSTEM  
Logic circuitry converts binary intelligence into a first amplitude for a binary "1" and a second amplitude for a binary "O." This same logic circuitry converts a frame timing signal into a third...
3634855 SELF-CLOCKING MULTILEVEL DATA CODING SYSTEM  
A data processing system in which a series of data bits of two or more different types are coded as changes in state of a recording or transmission medium or the like, with there being three or...
3623075 ASYNCHRONOUS DATA DECODER  
Digital information to be decoded is transmitted over a voice band transmission medium as a sequence of half-cycles of tone of different frequencies, with different frequency tones being utilized...
3609752 SIMULTANEOUS DATA ENCODER AND DECODER  
Encoding circuitry, receiving combinations of pulses at input terminals, produces combinations of audio frequency tones at an output terminal. For certain characters, the combinations of tones are...
3588879 MULTIDIGIT CODE TRANSLATOR  
3573766 APPARATUS AND PROCESS FOR RECORDING BINARY DATA IN COMPACT FORM  
Serial binary data to be recorded is divided into groups of equal numbers of bits in the order in which those bits appear in the original data format, and each group of bits is sampled in sequence...
3548404 FREQUENCY CODED DIGITAL RECORDING SYSTEM  
3544992 CODE TRANSLATOR  
3483321 DEVICE FOR THE TRANSMISSION BY TELEPRINTER  
1,154,649. Telegraphy. ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI. 6 Sept., 1967 [7 Sept., 1966], No. 40765/67. Heading H4P. In a telegraph system each serial-bit character in 5-bit code...
3305635 Multitone data transmission system with data bits comprised of combinations of data tones and rest tones  
3263185 Synchronous frequency modulation of digital data  
1,039,148. Data transmission. LENKURT ELECTRIC CO. Inc. Feb. 1, 1965 [Feb. 6, 1964], No. 4328/65. Heading H4P. To transmit binary data by frequency shift, the data is combined with clock pulses to...
3229279 Translator circuit  

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