39 results about "Ones' complement" patented technology

A method and apparatus for calculating a reciprocal of an integer using a modified Newton Raphson method using one's complements instead of two's complements. The method includes determining a required precision; determining a number of iterations T responsive to the required precision; normalizing N into d; obtaining initial approximation of 1 / d=R[0]; refining reciprocal approximation by the modified Newton Raphson operation using ones complements; truncating final iteration result R[T] responsive to the required precision; denormalizing R[T]; and outputting the reciprocal R.

A finite impulse response filter, including a plurality of taps arranged to receive and process a sequence of input data samples so as to generate a filter output. Each tap consists of a multiplier operating in one's complement arithmetic, the multiplier being coupled to multiply a respective input sample from the sequence by a respective equalization coefficient, and an adder, which sums an output from the multiplier. The taps are arranged in sequence so that the input sample to each of the taps, except to a first tap in the sequence, is delayed relative to a preceding tap in the sequence. The filter also includes an adjustment-accumulator coupled to receive the filter output and responsive thereto to generate an adjustment that is adapted to correct the filter output to a twos complement result, and an adjustment-adder which sums the adjustment and the filter output to generate a final output.

A controller for an adjustable-frequency oscillator includes a first counter supplied with a stop-count value to count adjustable-frequency oscillator cycles divided by the ratio of desired frequency to reference oscillator frequency, to produce a stop signal when the first counter reaches the stop-count value. A second counter counts cycles of a reference oscillator starting from an initial number related to the stop-count value. The second counter stops counting and produces an end-count when the second counter receives the stop signal from the first counter. A resonant tank circuit includes a bank of capacitors with switches to select resonant tank circuit capacitors. The switches are selectively controlled using the end-count in the second counter. The stop-count value is set for the first counter so that the end count number in the second counter using a ones-complement binary format can be used to iteratively set the switches with minimal digital computation.

In iterative-diversity (ID) transmission systems for signals with concatenated convolutional coding (CCC), paired iterative diversity signals each have ½ the code rate of the 8VSB DTV signals prescribed by the 1995 ATSC Digital Television Broadcast Standard. Known serial concatenated convolutional coding (SCCC) or novel parallel concatenated convolutional coding (PCCC) is used in such system. Pairs of CCC signals code data bits and ones' complemented data bits respectively, using similar coding algorithms. Receivers for this transmission system use respective turbo decoders for turbo decoding the earlier-transmitted and later-transmitted CCC signals. Turbo decoding of the earlier-transmitted portions of iterative diversity signals is delayed to be contemporaneous with turbo decoding of the later-transmitted portions of iterative diversity signals. This facilitates the turbo decoders exchanging information concerning confidence levels of data bits during the turbo decoding procedures.

In a DTV transmitter the bits of shortened BCH codewords that exhibit undesirably low densities of ONEs are ONEs' complemented before being further coded, and used to modulate carrier waves. In a DTV receiver the further coding is decoded after demodulation. The results of such decoding are processed to recover successive shortened BCH codewords, some of which are in TRUE form and others of which have had their bits ONEs' complemented. Each shortened BCH codeword is extended to full length with ZEROs, and decoding is attempted. Successful decoding confirms that the shortened BCH codeword was received in TRUE form. If decoding is unsuccessful, the bits of the shortened BCH codeword as received are ONEs' complemented, extended to full length with ZEROs, and decoding is attempted. Successful decoding confirms that the shortened BCH codeword was received in ONEs' complemented form and has subsequently been converted to TRUE form.

A digital television (DTV) system uses parallel concatenated coding (PCC), together with QAM constellations for modulating OFDM carriers. A first encoder responds to ONEs' complemented bits of randomized data to generate a first component of PCC. A second encoder responds to delayed bits of the randomized data to generate a second component of PCC. A constellation mapper generates QAM symbols responsive to successive time-slices of the first component of the PCC interleaved with successive time-slices of the second component of the PCC. An OFDM modulator generates a COFDM modulating signal responsive to the QAM symbols. In a receiver for the DTV system, the second component of the PCC and delayed first component of the PCC are iteratively decoded. Soft bits from the second component and delayed first component of the parallel concatenated coding are code-combined to supply soft randomized data used in that iterative decoding.

The invention discloses a signature method of preventing side-channel attack from multi-azimuth. The signature method of preventing side-channel attack from multi-azimuth is characterized in that the technology or similar technology contained in the signature method masks the base, and an RSA signature or other public key system signatures are obtained; in the signature method of preventing side-channel attack from multi-azimuth, two module exponentiation results are obtained at the same time, and the power exponents are radix minus one complement for each other; when modular exponentiation is realized, the verification technology of preventing outputting error data is used; and for the modular exponentiation algorithm which does not use the jump statement, the signature method of preventing side-channel attack from multi-azimuth is the technology that during the operation process, the data or the operation result data is equal to the Hamming weight. The signature method of preventing side-channel attack from multi-azimuth effectively protects the step which is known and is easy to be attacked during the RSA STD operation process. The modular exponentiation provided by the signature method of preventing side-channel attack from multi-azimuth can be fully applied to the RSA CRT operation, and can realize that the algorithm of the modular exponentiation algorithm and the complementary power can be transplanted to the point multiplication operation of SM2 at the same time. The test that whether the module exponentiation is attacked can be similarly transplanted in the point multiplication operation of SM2.

The invention discloses a joint coating method. The method comprises the steps that: firstly, surface treatment is carried out; secondly, preheating is carried out on a steel pipe; thirdly, the surface is coated with a joint coating piece; fourthly, the joint coating piece is coated with a metal interior lining panel; fifthly, coating and tightly locking are carried out on a steel hoop and an electric heating device; sixthly, warming is carried out by a program; seventhly, equipment is disassembled. The metal interior lining panel is high in rust-proof capacity, and is tightly connected with the joint coating piece as a whole in an adhesive mode, so that the barrier property to visible light, ultraviolet light, water, oxygen, and vapour of a joint coating layer is greatly improved, the mechanical damage resistance to a pointed object is enhanced, and the service life of the joint coating layer is greatly prolonged. By means of the steel hoop to carry out tightly locking and pressuring, enormous pressure is exerted on the joint coating piece during the softening and bonding process, the bonding strength on the steel pipe is greatly improved, the peeling strength under 23 DEG C can reach above 250 N / cm, the peeling strength under 50 DEG C can reach above 100 N / cm, and the peeling strength under 23 DEG C and the peeling strength under 50 DEG C are twice and five times stronger than the heat shrinking sleeve (belt) joint coating respectively.

The invention discloses a thermodynamic system of a concurrent heating ultra-high pressure / subcritical backpressure heat supply unit. The thermodynamic system comprises a reheating system, a low pressure reheating system, a high pressure reheating system, a boiler, a turbine and / or a small steam turbine which drives a boiler feeding pump, wherein the low pressure reheating system and the high pressure reheating system are connected with the small steam turbine, the high pressure reheating system is connected with the boiler and the turbine, and the boiler is connected with the turbine and the reheating system; the main steam pressure of the turbine is higher than conventional pressure and reaches up to ultrahigh pressure, subcritical or supercritical grade; the reheating system comprises a re-heater, the exhaust steam or extracted steam of the turbine is supplemented and heated by the boiler gas heat by virtue of a re-heater, and then the turbine is used for heating externally after the temperature of the steam reaches the requirements; the re-heater is made from a tubular product of a conventional boiler economizer. According to the thermodynamic system provided by the invention, the steam power improvement capacity of a backpressure unit can be improved, the generating condition can be greatly improved under the condition of completing a certain heating task, and the economic benefit of a power station can be obviously improved.

The invention relates to a fixed code length complementary type coding method for an infrared remote controller. According to the method, the infrared remote controller adopts the complementary type coding mode, i.e. each byte is coded, the ones-complement code of the byte tightly follows behind the byte, and in addition, a check code is set in the fixed code length; and corresponding decoding rules are correspondingly compiled on a receiving controller matched with the infrared remote controller and are used for receiving infrared codes sent by the infrared remote controller, in addition, the data can be confirmed and judged according to the original code, the ones-complement code and the check code, when the original code of the data has error codes, the correct data can also be recovered according to the ones-complement code and the check code, and the anti-interference capability is improved.

The invention relates to an imaging device which comprises a pixel array. The pixel array includes a plurality of pixels which are arrayed into lines and rows, and a plurality of column circuits, wherein each column circuit corresponds to one row of pixels in the pixel array. Each column circuit comprises a comparator and a radix-minus-one complement counter, wherein the comparator compares signals from pixels of a corresponding row with ramp signals, and the radix-minus-one complement counter counts and conducts radix-minus-one complement calculation on output signals of the comparator.

The present invention is applicable to the field of photography, and provides a method and device for supplementary light for camera photography, the method comprising: acquiring light source direction information of a scene photographed by a camera; adjusting the rotatable supplementary light according to the light source direction information of the scene The irradiation direction of the light source is to make the direction of the light source of the scene consistent with the irradiation direction of the supplementary light source; take pictures according to the adjusted supplementary light source. The present invention can obtain the light irradiated by the light source in the same direction in the shooting scene, so that the irradiated light source of the photographed object can be made purer, and clearer photos can be taken.

The invention discloses a cable detecting system which comprises a transmitting terminal and a receiving terminal, wherein a port of the transmitting terminal can be connected with a port at one side of each core wire of a to-be-tested cable, and a port of the receiving terminal can be connected with a port at the other side of each core wire of the to-be-tested cable, the transmitting terminal is used for transmitting test codes to the receiving terminal by the to-be-tested cable, and generating a cable test report on the basis of radix-minus-one complements of port codes fed back by the receiving terminal and the test codes. When the transmission fluency of the to-be-tested cable needs to be tested in the cable detecting system disclosed by the invention, the transmitting terminal can transmit the test codes which are transmitted to the receiving terminal by the to-be-tested cable, when the receiving terminal receives the test codes, the receiving terminal can transmit the radix-minus-one complements of the port codes to the transmitting terminal, the transmitting terminal can generate the cable test report on the basis of the generated radix-minus-one complements of the port codes and the test codes through the to-be-tested cable. Therefore, the on-off state of each core wire of the to-be-tested cable can be known by directly reading the cable test cable, without the help of manpower, and the operation is simple and convenient.