Class 341/54 - Bit represented by discrete frequency

Subclass of Class 341 - Coded data generation or conversion
Definition: Subject matter where different specific frequencies are
No. of patents: 29
Last issue date: 03/20/2012

Number	Title	Issue Date
8138955	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 combine the first one-bit pulse stream and a second multi-bit term, thereby...	03/20/2012
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 includes a plurality entries, each representing an encoded symbol, in...	02/02/2010
7229154	Ink ejection nozzle with a thermal bend actuator An ink ejection nozzle comprises a chamber for holding ink to be ejected, the chamber having an opening defined in a roof structure; and a thermal bend actuator for ejecting droplets of ink from the chamber through the opening. The bend actuator is configured as a c...	06/12/2007
7099823	Coded voice signal format converting apparatus A coded voice signal format converting apparatus is provided which is capable of converting a signal format of a coded voice signal by computations in reduced amounts. In the coded voice signal format converting apparatus, in a second coding device is employed a qua...	08/29/2006
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 characteristic frequencies, each of which is associated with a known unique positio...	07/11/2006
7009547	Current steering folding circuit A current steering folding circuit is provided. The current steering folding circuit includes a load and at least one current source for drawing a current from the load. The current steering folding circuit also includes a first output signal terminal for providing ...	03/07/2006
6943711	Frequency-digital signal conversion circuit There is provided a frequency-digital signal conversion circuit for automatically converting a clock frequency into a digital signal. The frequency-digital signal conversion circuit includes: a frequency detecting unit for detecting a frequency of an input clock sig...	09/13/2005
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 first interpolated by a factor of eight and lowpass filtered to form ...	03/22/2005
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 generating unit for outputting a binary code value according to ...	06/24/2003
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 input data sequence comprised of bits, and a decoder. The dec...	11/05/2002
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. A DSP unit receives a sequence of multi-bit digital samples...	06/11/2002
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 receiver receiving a clock signal and the multiplexed optic...	03/20/2001
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 utilizes the phase angle of previously encoded data to encode the ...	01/16/2001
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 frequency. In making such determinations, the values for characte...	08/22/2000
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 frequency component decomposing circuit 701 to undergo normalizat...	05/19/1998
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 occurrent logic states (1,0) are each represented by a respecti...	09/26/1995
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 calculated by a processor from the ratio of the sample rates...	06/02/1992
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 an output sampling frequency. The converter has an over-sam...	02/05/1991
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 corresponding analog signal in an interval thereof defined b...	03/28/1989
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 the output of the DTMF receiver. The decoding means provid...	07/22/1986
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 an associated data field. The two fields are differently e...	03/05/1985
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 provided for each half wave in which criteria of the signa...	09/25/1984
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 transmitted in a "C" channel whenever it is the same as the prev...	01/10/1984
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 into a four digit binary code word. Each different four bi...	08/16/1977
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 a filter to high and low band translator circuits. Each tra...	06/07/1977
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 data defining the required frequency. Stochastic conversion m...	05/24/1977
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 devices sends to the other a plurality of low and high group fr...	12/28/1976
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 binary number or a binary-coded decimal number having a predete...	11/02/1976
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....	08/24/1976

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Class 341/54 - Bit represented by discrete frequency