Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 4722067 | Method and apparatus for implementing modulo arithmetic calculations A modulo arithmetic unit and method for providing a sum of first and second numbers is provided. In one form, a first adder calculates a first sum which is equal to the arithmetic sum of the first and second numbers. A second adder is provided for adding ... | 01/26/1988 |
| 4709345 | Apparatus for executing Chinese remainder theorem for residue decoding through quotient-remainder conversion A mechanism for implementing the Chinese remainder theorem includes a signal processing architecture that is effectively configured principally of binary adders and lookup tables having small address space. Through a set of lookup tables referencing a pre... | 11/24/1987 |
| 4689738 | Integrated and programmable processor for word-wise digital signal processing An integrated and programmable processor for word-wise digital signal processing. The processor has a multiplier element, an arithmetic and a logic unit, a data memory and a connection for a control memory which may be integrated on-chip. The elements are... | 08/25/1987 |
| 4598266 | Modulo adder A modulo 22n -1 adder employing adders which may all be standard binary adders. A first binary adder sums binary input signals a and b to produce a first sum signal in which the n+2 more significant bits represent the integer part of (a+b)/2 | 07/01/1986 |
| 4588980 | Residue to analog converter A residue to analog converter associated with residue numbers {m1,m2,m3} of the residue number system defined by the moduli set {p1=2n -1, p2=2n, p3=2n +1} and which does not require memory comprises five standard binary a... | 05/13/1986 |
| 4584562 | Method of residue to analog conversion A method is disclosed for accomplishing modulo 22n -1 addition with apparatus requiring adders that may be all standard binary adders. The method requires summing binary input signals a and b to produce a first sum signal in which the n+2 more ... | 04/22/1986 |
| 4584561 | Method of residue to analog conversion In a residue number system defined by the moduli set {p1=2n -1, p2=2n, p3=2n +1}, a method of converting residue numbers {m1,m2,m3} to associated analog signals r(m1,m2,m3) comprises the steps of selecting a first binary s... | 04/22/1986 |
| 4584564 | Residue to analog converter A residue to analog converter associated with residue numbers {m1,m2,m3} of the RNS defined by the moduli set {p1=2n -1, p2=2n, p3=2n +1} comprises a pair of ROMs and a pair of standard binary adders. The first ROM stores ... | 04/22/1986 |
| 4584563 | Method of residue to analog conversion In a residue number system defined by the moduli set {p1=2n -1, p2=2n, p3=2n +1}, a method of converting residue number signals {m1,m2,m3} to associated analog signals r(m1,m2,m3), and that does not require memory devices,... | 04/22/1986 |
| 4567355 | Method and optical apparatus for converting residue numbers into positionally notated numbers A method and optical arithmetic apparatus for converting residue numbers into positionally notated numbers utilize linear periodic structures which can be shifted relative to one another, each linear periodic structure being allocated to a prime number mo... | 01/28/1986 |
| 4555769 | Circuit apparatus for generating modulus-N residues A modular modulus-N residue circuit apparatus uses cascode logic networks in the modules for generating greater than one odd integer N residues.... | 11/26/1985 |
| 4537502 | Multiple discrete frequency ranging with error detection and correction A range determination apparatus for determining target range within a range depth of D and within a range bin error of e comprises a carrier frequency transmitter for transmitting a carrier frequency and a generator for generating at least two modulating ... | 08/27/1985 |
| 4538238 | Method and apparatus for calculating the residue of a signed binary number Method and apparatus for calculating the residue of a signed binary number of "n" bits with respect to a given check base m where m=2b -1. The bits of the binary number excluding the sign bit are partitioned into number segments, each of b bits... | 08/27/1985 |
| 4538237 | Method and apparatus for calculating the residue of a binary number Method and apparatus for calculating the residue of a binary number of "n" bits with respect to a given check base m where m=2b -1. The binary number is partitioned into segments, each of b bits starting with the least significant bit. If n is ... | 08/27/1985 |
| 4532638 | Method and apparatus for the exponentiation of large binary numbers in a residue class modulo N, particularly for encoding and decoding digitally-represented messages A method and apparatus provides for exponentiation of large binary numbers in a residue class modulo N, particularly for encoding and decoding digitally-represented messages, in which the exponentiation comprises repeated scoring/multiplication cycles wit... | 07/30/1985 |
| 4506340 | Method and apparatus for producing the residue of the product of two residues Method and apparatus for producing the residue of the product of a multiplier and a multiplicand where the multiplier, multiplicand and product are residues with respect to a check base m, and where m=(2b -1) and b is the number of bits in a re... | 03/19/1985 |
| 4458327 | Prime or relatively prime radix data processing system This system is configured to operate in a number system in which the radix of each digit is a different prime number, or a system in which all of the radices are relatively prime, hereafter a prime or relatively prime radix number system. The system inclu... | 07/03/1984 |
| 4418394 | Optical residue arithmetic computer having programmable computation module An optical computer based on the residue number system employs a plurality of computational modules which may be programmed using electronic pulses to perform addition, subtraction, multiplication and division operations. Each module comprises an array of... | 11/29/1983 |
| 4366549 | Multiplier with index transforms modulo a prime or modulo a fermat prime and the fermat prime less one An asynchronous data-processing system for multiplying two binary numbers, by a use of read-only memories storing tables of data for transforming the numbers into exponents of a prime number. The exponents are added and then transformed back into the term... | 12/28/1982 |
| 4363106 | Computation module for addition and multiplication in residue arithmetic A computation module useful as part of a optical numerical computer based on the residue number system includes an M×N array of double input, double output electrically actuated optical switches. Optical pathways interconnect each of the outputs of the s... | 12/07/1982 |
| 4346451 | Dual moduli exponent transform type high speed multiplication system For calculating a product of a first and a second integer, each given by even digits, a multiplier comprises a first unit for calculating a first residue congruent to the product modulo a prime number by the use of one-to-one correspondence of each intege... | 08/24/1982 |
| 4334277 | High-accuracy multipliers using analog and digital components An apparatus multiplies two sequences of digital numbers ai and b.su, which may represent signal pulses of various amplitudes. A first plurality of t read-only memories (ROMs), have a common input adapted to receive the sequence of numbers a | 06/08/1982 |
| 4281391 | Number theoretic processor Input data is converted into its modular equivalents. These equivalents are used to perform the desired computation in a modular manner. Each computation is done for several moduli. The various modular results are woven into a mixed radix version of the a... | 07/28/1981 |
| 4267580 | CCD Analog and digital correlators A charge-coupled device (CCD) analog and digital correlator comprises identical modules, each of which is a simple analog CCD correlator with digital input and output. Circuits are included: (1) for injecting charges proportional to the voltage sequences s(n) ... | 05/12/1981 |
| 4190893 | Modular modulo 3 module A modular modulo 3 module is provided having a plurality of input terminals for receiving in parallel two bytes of numerical data, and a plurality of output terminals for outputting the modulo 3 residue of each byte of data individually and the modulo 3 r... | 02/26/1980 |
| 4187549 | Double precision residue combiners/coders Apparatus, useful in signal processing, and which can be used for modulo (2n -1) addition, subtraction, coding, and decoding, has a plurality of 2n input means: n means for receiving a signal I0, I1, . . . , In-1 | 02/05/1980 |
| 4181968 | Method and apparatus for forming convolutions of two complex number sequences using the fermat number transform A digital computing method and apparatus for complex numbers which, more particularly, comprises a technique and hardware for forming the complex linear vector product of two transformed sequences. The invention is designed for use in a computer system wh... | 01/01/1980 |
| 4121298 | Central processing unit for numbers represented in the system of residual classes According to the invention, the central processing unit for numbers represented in a system of residual classes comprises registers of first and second operands which are connected to generators, a multiplier, a divider, a shift unit, a modular arithmetic... | 10/17/1978 |
| 4107783 | System for processing arithmetic information using residue arithmetic A system for processing arithmetic information wherein the residue number system is used to partition a calculation into several simpler calculations each of which can be processed in parallel with complete independence. These segments are computationally... | 08/15/1978 |
| 4095275 | Pulse width modulated sine cosine generator The disclosure relates to a pulse width modulated sine-cosine wave generator in which all bits of a first counter, save the most significant bit, address a read only memory (ROM) which has a programmed output for each address. The ROM has sine and cosine ... | 06/13/1978 |
| 4064400 | Device for multiplying numbers represented in a system of residual classes According to the invention, a device for multiplying numbers represented in the system of residual classes comprises an add-shift unit having its output connected to a product bus, while its inputs are coupled to a multiplicand reducer, a multiplier gener... | 12/20/1977 |
| 4064421 | High speed modular arithmetic apparatus having a mask generator and a priority encoder In a high speed arithmetic apparatus, the tally coded output of a modular mask generator addressed by a binary first operand and the tally coded input of a priority encoder are joined together by an interconnecting apparatus. The interconnecting apparatus... | 12/20/1977 |
| 4041284 | Signal processing devices using residue class arithmetic Apparatus for performing arithmetical calculations on a plurality, N, of ital input signals, utilizing residue class arithmetic, comprising a plurality N of means for coding the N input digital signals into digital modulo mi integers, Kࣘiࣙ... | 08/09/1977 |
| 3980874 | Binary to modulo M translation Modulo M translation is performed on a large binary number of n bits by grouping the binary number in contiguous sets of approximately K bits each, storing the modulo M residues for each K bit set in an individually associated pre-stored ROM, reading the ... | 09/14/1976 |
