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| Number | Title | Issue Date |
| 4305133 | Recursive type digital filter A recursive type digital filter receiving a digital input signal x(n) having a plurality of bits and delivering a ditial output signal y(n) satisfying the following equation, ##EQU1## where n indicates a natural number, M and N orders of time lag in ... | 12/08/1981 |
| 4255794 | Digital filter The digital filter which performs a filter mathematical operation on 2N samples Zi expressed by binary codes in which an output sample y(n) of said filter is expressed by the following equation: ##EQU1## where magnitude of ##EQU2## represen... | 03/10/1981 |
| 4228517 | Recursive filter A recursive filter characterized by increased efficiency and accuracy and incorporating a step decision circuit which reduces filter noise, error and size. Efficiency is obtained by reducing the requirement for bulk memory and the number of multipliers wh... | 10/14/1980 |
| 4223389 | Recursive digital filter having means to prevent overflow oscillation This invention has been made in order to prevent the malfunction due to an overflow, of a combinatorial type recursive digital filter whose feedback side is of the second or higher order. Means for detecting the overflow of the output of an arithmetic uni... | 09/16/1980 |
| 4215415 | Recursive digital filter comprising a circuit responsive to first sum and feedback sign bits and second sum sign and integer bits for detecting overflow in the second sum In a recursive digital filter for dealing with data words given by two's complement representation in a common word format comprising a sign bit, an integer bit, and a predetermined number of fractional bits, an overflow detect and correct circuit is supp... | 07/29/1980 |
| 4188667 | ARMA filter and method for designing the same A near minimum order ARMA type recursive filter with guaranteed stability and convergence is provided together with a method for obtaining the parameters of such filter. The amplitude/frequency response of the filter approximates an arbitrarily selected f... | 02/12/1980 |
| 4185325 | Recursive digital filter having coefficients equal to sums of few powers of few powers of two terms Recursive digital filter deriving the samples of a filtered output signal at a present sampling instant from the samples of an input signal to be filtered at said present sampling instant and at two preceding consecutive sampling instants and from samples... | 01/22/1980 |
| 4146931 | Digital filter A digital filter configuration incorporating read-only memories for coefficient storage is disclosed in which substantial reduction in memory requirements is achieved. Two read-only memories are addressed by only three arguments for a second-order filter ... | 03/27/1979 |
| 4128890 | Integrated arithmetic unit and digital networks using the unit The invention relates to an arithmetic unit fabricated by large scale integration techniques and to an improved digital network of increased accuracy in which the unit finds application. The integrated circuit comprises an initial summing means, rounding ... | 12/05/1978 |
| 4125900 | Cascaded recursive digital filter A cascaded digital recursive filter is designed to filter a time varying digital input signal by repetitively implementing a sequence of filtering equations which include a predetermined number of filter coefficients to generate a filtered digital output ... | 11/14/1978 |
| 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 sampling rate for FDM to TDM conversion. The rate multiplic... | 09/26/1978 |
| 4104729 | Digital multiplier The digital multiplier is of the add and shift type with a matrix type input in which a number of serial data words can be applied simultaneously to the multiplier enabling the multiplier to compute simultaneously the sum of a number of products. This mul... | 08/01/1978 |
| 4099245 | Transducer signalling apparatus A system for accumulating and processing data derived from plural transducers, such as an array of shaft position-measuring resolvers and/or other monitored parameters, includes multiplexing apparatus for converging the outputs of the transducers and the ... | 07/04/1978 |
| 4075764 | Device for determining the north direction A highly-amplified pickoff signal responding to positional deviations of a wire-suspended gyro are fed to a torquer connected to the gyro. In response to these the torquer exerts on the gyro a torque counteracting the gyro directing torque. The pickoff si... | 02/28/1978 |
| 4066881 | Sampled signal processing device A device for performing the discrete Fourier transform on a sequence of an arbitrary number N of equally spaced signal samples. The device includes a digital filter having a transfer function: ##EQU1## Calculation coefficients sin 2πr/N and cos 2πr... | 01/03/1978 |
| 3993890 | Combinatorial digital filter A combinatorial digital filter apparatus utilizing a second order filter in which bits are processed simultaneously rather than serially.... | 11/23/1976 |
