Matches 201 - 239 out of 239 < 1 2 3 4 5
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4138730 High speed FFT processor  
An FDM/TDM transmultiplexer uses sampling rate multiplication to increase the sampling rate for time division multiplexed (TDM) to frequency division multiplexed (FDM) conversion and decrease the...
4131766 Digital filter bank  
Disclosed is a digital filter for modulating and demodulating in frequency division multiplexing systems. For modulating a number of voice channels, a Fourier transform processor computes the...
4117541 Configurable parallel arithmetic structure for recursive digital filtering  
An FDM/TDM transmultiplexer uses sampling rate multiplication to increase the sampling rate for time division multiplexed (TDM) to frequency division multiplexed (FDM) conversion and decrease the...
4093988 High speed frequency response measurement  
A binary pseudo-random sequence generated by a shift register with feedback is used as a noise signal for testing an electrical or mechanical system, and the output is sampled and the power spectra...
4075630 Signal processor  
A signal processor for use in a small, lightweight radar-guided missile to provide a discrete Fast Fourier Transform (FFT) on received radar return signals. The radar return signals are converted...
4058715 Serial FFT processing unit  
An FFT processing unit of simplified construction comprises one or more arithmetic stages serially connected. Each stage has a plurality of recursive arithmetic paths each consisting of a delay...
4058713 Equalization by adaptive processing operating in the frequency domain  
Equalization apparatus for a communication system transmitting through a time or frequency spread medium. The message to be transmitted is partitioned and transmitted in burst or frame by frame...
4057756 Signal processors  
In a spectrum analyzer, the analogue signal to be analyzed is periodically sampled and digitized, and the digit samples are formed into R successive arrays each containing 2N successive samples and...
4051357 Double odd discrete fourier transformer  
An arrangement for computing the discrete Fourier transform intended for converting N samples of a real signal in the time domain to N real Fourier coefficients. This device is implemented with a...
4025730 In-band signal receiver  
A multifrequency signal receiver for an in-band audio frequency signalling system uses Discrete Fourier Transform or Fast Fourier Transform processing techniques or a combination of both to...
4020334 Integrated arithmetic unit for computing summed indexed products  
The invention relates to an integrated arithmetic unit for computing summed indexed products and suitable for fabrication by large scale integration techniques. The arithmetic unit comprises a...
3965342 Digital FFT processor using random access memory  
A system for digital signal processing including a random access memory accessed by counters and used for storing and shifting signals in a fast Fourier transformer (FFT).
3927312 Vector rotator  
A two stage approach is used in which rotation angles are specifically seted for easy mechanization. First stage provides rotations in even 30° increments so that multiplications are replaced by...
3899667 Serial three point discrete fourier transform apparatus  
Serial three point discrete fourier transform apparatus is disclosed. The apparatus includes a summing circuit, a differencing circuit and a pair of storing means. A first digital sample is...
3883726 Redundant fast fourier transform data handling computer  
Special purpose data handling equipment is utilized with a fast Fourier transform algorithm computer. The equipment buffers input data such that each block of input data includes data from the...
3881100 Real-time fourier transformation apparatus  
An apparatus for performing real-time Fourier transformation of a time varying signal by taking successive digital samples in a shift register means and repeatedly transforming preselected pairs of...
3876946 Radio frequency digital fourier analyzer  
A radio frequency digital Fourier analyzer is provided which serves not only as a spectrum analyzer, but as an important statistical tool. The digital Fourier analyzer comprises a two-channel...
3871577 Method and apparatus for addressing FFT processor  
Method and apparatus for reducing the hardware requirements and complex control of an in-place Fast Fourier Transform (FFT) processor by a unique repetitive arrangement of the stored data pattern...
3862406 DATA REORDERING SYSTEM  
A combination of delays and programmed switches is used to convert serial data in reverse binary order to normal binary order or to convert data in normal binary order to data in reverse binary order.
3816729 REAL TIME FOURIER TRANSFORMATION APPARATUS  
An apparatus for performing real-time Fourier transformation of a time varying signal by taking successive digital samples in a shift register means and repeatedly transforming preselected pairs of...
3812470 PROGRAMMABLE DIGITAL SIGNAL PROCESSOR  
A programmable digital signal processor using microprogrammed macro instructions to perform complex arithmetic instructions and other complex data processing instructions is disclosed. A plurality...
3803391 A REAL-TIME PROCESSING SYSTEM AND METHOD UTILIZING DISCRETE FOURIER TRANSFORM  
A method of and device for carrying out real-time processing of electrical signals wherein, after sampling and quantizing the signals which are to be processed, real samples N are subjected to a...
3800130 FAST FOURIER TRANSFORM STAGE USING FLOATING POINT NUMBERS  
System for performing complex Fourier operations of multiplying a fixed complex number by a floating point complex number and adding to the resulting product another floating point complex number.
3783258 FFT PROCESSOR UTILIZING VARIABLE LENGTH SHIFT REGISTERS  
A processor for radar and multichannel sonar spectral analysis of band-limited input signals, is based on a shift register implementation of a fast Fourier transform algorithm coupled with a single...
3777131 HIGH BASE MULTIPLE RAIL FOURIER TRANSFORM SERIAL STAGE  
A serial processor section for use in a parallel-serial processor of a multiple-input Fast Fourier Transform (FFT) machine wherein a base higher than 2 is used for the expansion of the Cooley-Tukey...
3767905 ADDRESSABLE MEMORY FFT PROCESSOR WITH EXPONENTIAL TERM GENERATION  
The fast Fourier transform is a known algorithm which can be written: A l ( b m-1 b m-2 . . . b m-l . . . b1 b0 ) = 1/c[A l -1 (b m -1 b m - 2 . . . 0 . . . b 1 b 0 ) +A l -1 (b m -1 ...
3746848 FFT PROCESS AND APPARATUS HAVING EQUAL DELAY AT EACH STAGE OR ITERATION  
Methods and apparatus for performing a sequential or cascaded version of the fast Fourier transform are described. A uniform set of delays are introduced in the described methods and apparatus,...
3731284 METHOD AND APPARATUS FOR REORDERING DATA  
A reordering method and associated apparatus for storing and accessing samples of a physical process to facilitate the generation of Fourier series coefficients is disclosed. In particular, methods...
3721812 FAST FOURIER TRANSFORM COMPUTER AND METHOD FOR SIMULTANEOUSLY PROCESSING TWO INDEPENDENT SETS OF DATA  
Special purpose computing equipment is utilized to perform the Fast Fourier Transform algorithm. The computing equipment utilizes serial access memory for storing coefficients during interim...
3704826 REAL TIME FAST FOURIER TRANSFORM PROCESSOR WITH SEQUENTIAL ACCESS MEMORY  
N complex samples of an input signal are stored in a sequential access circulating memory, and then transmitted to a calculator which has a pair of shift registers, each of N words capacity; the...
3673399 FFT PROCESSOR WITH UNIQUE ADDRESSING  
A real time digital Fourier analyzer using the Cooley-Tukey algorithm for calculating the Fast Fourier Transform. An arithmetic unit simultaneously performs the two complex calculations A r = B r ...
3662161 GLOBAL HIGHLY PARALLEL FAST FOURIER TRANSFORM PROCESSOR  
A fast Fourier transform processor and associated process wherein an input sequence of samples is broadcast to each of a plurality of parallel processing elements where sets of accumulated sums of...
3634760 FREQUENCY SPECTRUM ANALYZER WITH FFT COMPUTER  
A broad band of signal frequencies, whose power spectrum is to be analyzed by the Fast Fourier Transform (FFT) technique, is sampled by heterodyning with various beat frequencies f b and passage...
3617720 FAST FOURIER TRANSFORM USING HIERARCHICAL STORE  
Methods and apparatus for performing fast Fourier transforms corresponding to a sequence of input data signals are described. Efficient allocation and buffering of a small high-speed memory within...
3601592 FAST FOURIER TRANSFORM ADDRESSING SYSTEM  
A fast Fourier transform addressing system using the Danielson-Lanczos algorithm. The addressing system uses a basic relationship between addresses to allow implementation of the addressing system...
3584781 FFT METHOD AND APPARATUS FOR REAL VALUED INPUTS  
Methods and apparatus for generating Fourier series coefficients by fast Fourier transform techniques are disclosed. When the input sequence to be transformed includes only real-valued signals,...
3584782 FAST FOURIER TRANSFORM METHOD AND APPARATUS  
A method and apparatus is disclosed for performing fast Fourier transformations on real-valued input signals. A systematic procedure is followed in accessing operands on successive iterations, and...
3573446 REAL-TIME DIGITAL SPECTRUM ANALYZER UTILIZING THE FAST FOURIER TRANSFORM  
A digital signal processing system for computing the finite discrete Fourier transform coefficients from a number (N) of digitized samples of an input signal in real time. The signal being analyzed...
3517173 DIGITAL PROCESSOR FOR PERFORMING FAST FOURIER TRANSFORMS  
Matches 201 - 239 out of 239 < 1 2 3 4 5