116 results about "Bit inversion" patented technology

In some embodiments, a data processing system including an operation unit including circuitry configurable to perform any selected one of a number of operations on data (e.g., audio data) and a configuration unit configured to assert configuration information to configure the operation unit to perform the selected operation. When the operation includes matrix multiplication of a data vector and a matrix whose coefficients exhibit symmetry, the configuration information preferably includes bits that determine signs of all but magnitudes of only a subset of the coefficients. When the operation includes successive addition and subtraction operations on operand pairs, the configuration information preferably includes bits that configure the operation unit to operate in an alternating addition/subtraction mode to perform successive addition and subtraction operations on each pair of data values of a sequence of data value pairs. In some embodiments, the configuration information includes bits that configure the operation unit to operate in a non-consecutive (e.g., butterfly or bit-reversed) addressing mode to access memory locations having consecutive addresses in a predetermined non-consecutive sequence. Other aspects are audio encoders and decoders including any embodiment of, and configuration units and operation units for use in, any embodiment of the system, and methods performed during operation of any embodiment of the system or configuration or operation unit thereof.

A GPS receiver for integrating a GPS signal separately in a series of “A” type and “B” type time segments, the “A” segments alternating with the “B” time segments; combining the squares of the magnitudes of “A” time segment integrations corresponding to code phases for forming “A” type combined magnitudes; combining the squares of the magnitudes of the “B” time segment integrations corresponding to code phases for forming “B” type combined magnitudes; and determining an acquisition code phase of the signal from the strongest of the “A” or “B” combined magnitudes. The “A” time segments and the “B” time segments are one-half the period of the data bits of the signal, thereby ensuring that either the “A” time segments or the “B” time segments avoid the nullifying effect of data bit inversions.

Provided are a digital video data transmission system and digital video data transmission method. The digital video data transmission system includes a transmitting unit transmitting valid first data in input digital video data having spatial locality to a bus as output encoding information without bit-inversion coding the first data, bit-inversion coding previous data of output encoding data corresponding to the input digital video data based on differential values of adjacent digital video data, and transmitting the bit-inversion coded value to the bus as the output encoding information; and a receiving unit not decoding output encoding information transmitted in parallel through the bus, i.e., the first data, but decoding output encoding information transmitted in parallel through the bus based on the differential values. The output encoding information includes the output encoding data and coding enable information that indicates whether to bit-inversion encode previous data of the output encoding data. The digital video data transmission system and digital video data transmission method can reduce the number of transitions of bits included in the digital video data transmitted through the bus, thereby reducing power consumption and electromagnetic interference.

In a technique of partially serializing video data to transfer it from a display control circuit to a signal-line driving circuit such as a source driver, data comparisons ① and ② in the data order after serialization are made sequentially in a stage of parallel data prior to making a parallel-to-serial conversion of the video data, and determination is made as to whether or not the bit inversion number of the data is more than half to take a control of an inversion/noninversion for the transfer data. An operational speed of a comparator, an inversion/noninversion determination circuit, etc. can be reduced as compared with the case in which a control is taken of the inversion/noninversion for the data of which an operation speed became high by partially serializing the video data.

An electric circuit for inverting a data bit of a data burst read out from a memory module comprises a buffer for buffering a data burst being comprised of at least two data words, a decoder device comprised of at least two parallel-connected decoders, each comparing bitwise and simultaneously two neighbouring data words of the data words buffered in the buffer and generating an inversion flag, if the number of different data bits of the two neighbouring data words exceeds half the number of data bits of a data word, a correction device for generating a corrected inversion flag for a specific decoder of the decoders by inverting or not inverting the inversion flag of the specific decoder dependent on the inversion flag generated by the specific decoder and the inversion flags generated by the remaining of the decoders, and an inversion device comprised of a plurality of inverters, each inverting or not inverting a present of the data words of an associated of the decoders dependent on the corrected inversion flag of the associated decoder.

Data bit inversion tracking in cache memory to reduce data bits written for write operations is disclosed. In one aspect, a cache memory including a cache controller and a cache array is provided. The cache array includes one or more cache entries, each of which includes a cache data field and a bit change track field. The cache controller compares a current cache data word to a new data word to be written and stores a bit track change word representing the difference (i.e., inverted bits) between the current cache data word and the new data word in the bit change track field. By using the bit track change word stored in the bit change track field to determine whether fewer bit writes are required to write data in an inverted or a non-inverted form, power consumption can be reduced for write operations through reduced bit write operations.

A circuit for producing a data bit inversion flag comprises a first summed-current production unit for producing a first summed current, whose amplitude is proportional to the number of different data bits in two adjacent data words in a data burst, a second summed-current production unit for producing a second summed current, whose amplitude is proportional to the number of identical data bits in the two adjacent data words, and a current comparator comparing the first with the second summed current and producing a data bit inversion flag if the first summed current is greater than the second summed current.

The embodiment of the invention provides a data encryption method and decryption method and device. The data encryption method comprises the steps that bit operation is performed according to plaintext data, a secret key and first random data so that first ciphertext data are obtained; bit operation is performed according to the secret key and the first random data so that second random data are obtained; the second random data are inserted in the first ciphertext data so that second ciphertext data are obtained; and bit inversion operation is performed on the second ciphertext data so that final ciphertext data are obtained. The algorithm is simple and the encryption efficiency is high so that the decoding difficulty can be greatly increased and thus the confidentiality and the security of information can be increased.

A transmitting apparatus for encapsulating data received from an asynchronous network to a frame of a specified format and transmitting the received data as a synchronous frame to a synchronous network, includes a code generating part configured to generate an error detection code for detecting an error in the received data and add the error detection code to the received data, an inverting part configured to perform bit inversion in which the received data added with the error detection code are converted to bit inverted received data, a selecting part configured to select either the received data or the bit inverted received data according to the number of bit patterns included in the received data and the bit inverted received data, and a transmitting part configured to transmit either the received data added with the error detection code or the bit inverted received data selected by the selecting part.

A digital signal processor DSP for bit-reversal of a large data array of a size has a direct memory access (DMA) controller for performing in-place bit reversal routines on an external memory during a first stage, and a central processing unit (CPU) for swapping small sub-arrays on internal memory in a second stage. The two stage method according to the invention importantly reduces the real-time implementation for sorting large size data arrays on uni-processor DSP platforms, by extensively using the external memory and avoiding a random access to the internal memory. As well, the invention provides for improved dense integration and reduced costs when used in dense wavelength division multiplexing (DWDM) systems.

The invention discloses a system polarization code puncturing method and system based on reliability. The method comprises the steps of performing reliability calculation on a system polarization codewith a code length of N; assuming that an L bit needs to be shortened, firstly selecting the last L sub-channel as a first part of a frozen bit, taking the K sub-channel with the highest reliabilitymetric value as an information bit from the remaining (N to L) sub-channels, and taking the remaining sub-channels as a second part of the frozen bit; performing bit inversion replacement on the indexvalue of the first part of the frozen bit to obtain a codeword end punching vector index s; encoding the system polarization code; deleting codeword bits at corresponding positions according to the punching vector index s; transmitting the punctured system polarization code through a Gaussian channel; initializing a log-likelihood ratio corresponding to the punching index vector s to be infiniteat a decoding end; and evaluating the puncturing method. According to the invention, the system polarization code can adapt to different code lengths on the premise of not changing the basic structureof the system polarization code.

Counter control section 101 increments a row number and column number on a two-dimensional array for a block interleave expressed by a matrix two-dimensional array, outputs the incremented numbers as the read address values, bit inversion apparatus 102 performs bit inversion using the read address values as inputs, column conversion section 103 outputs the address values corresponding to the bit inversion output values and the column numbers from counter control section 101 as the column conversion values, shift register 104 bit-shifts the output values of bit inversion apparatus 102 and outputs as the address offset values, adder 106 adds up the address offset values and column conversion values and size comparison section 106 compares the addition value with the interleave size and outputs data which is not greater than the interleave size as address values.

A data processing apparatus includes a data conversion unit for converting a plurality of sequentially input data into transfer data and sequentially transferring the transfer data, arranging the input data in each conversion unit using one transfer data as one transfer unit and a prescribed number of transfer units as one conversion unit, and the data conversion unit includes a first bit division unit for dividing the input data into first and second divided data, a bit comparison unit for comparing first divided data of an n-th time (n is a natural number equal to or more than 1) and an (n+1)-th time, a bit determination unit for determining whether the first divided data is to be inverted based on the determination result to output inversion information, a first bit inversion unit for outputting data selected based on the inversion information, and a first bit coupling unit.

The invention discloses a low power consumption compact digital decimation filter for a CMOS image sensor. The low power consumption compact digital decimation filter comprises a ripple counter, a bit-by-bit inversion module BWI, an adder and a 13-bit register, and an inverter and the bit-by-bit inversion module BWI are arranged in front of the adder, the output data bit width of the ripple counter is 7 bit and is half of the output data bit width of the register; an meanwhile, the register only needs 13 bits to realize a 13-bit dynamic range. In practice, since the output data bit width of the ripple counter is 7 bit and is half of the output data bit width of the register, the number of inverters and selectors is reduced by half compared to the original. Meanwhile, the structure guarantees that the register data will not have the problem of data overflow, so the register only needs 13 bits to realize the 13-bit dynamic range without overflowing the data bit register. The low power consumption compact digital decimation filter disclosed by the invention adopts a special structure of pre-BWI, which greatly reduces the number of filter transistors, reduces the power consumption andreduces the cost.

A data transformation algorithm is selectively applied to each data vector as it enters the pipelined structure. In a selection step, the algorithm compares the bit value of the new data vector with the corresponding bit values of the preceding data vector, and sums the number of logic transitions. The transformation algorithm is applied to the new data vector only if it would reduce the resulting number of transitions, otherwise the data vector is propagated unmodified. Bit inversion is a data transformation algorithm according to the present invention that provides up to a 50% reduction in the number of logic transitions.