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Nussbaumer Henri J: Digital filters. International Business Machines Corporation, Thomas Delbert C, October 21, 1975: US3914588 (30 worldwide citation)

A transversal type of digital filter is disclosed which uses substantially less hardware than previously known types. Conventional multiplying devices are eliminated by use of a read only memory containing a table of squares and addressed both by weighted value samples of the input signal and by val ...


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Choquet Michel F, Nussbaumer Henri J: Memory controlled multiple phase shift modulator. International Business Machines Corporation, July 17, 1973: US3747024 (15 worldwide citation)

In a multiple phase or differential phase modulator encoding successive groups of N digital data bits occurring at data rate 1/T into signals of the form (sin X/X) cos (wt + .phi..sub.i), wherein each encoded signal exercises a progressively diminishing intersignal interference of time duration RT. ...


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Nussbaumer Henri J, Paris Etienne E: Synchronizer for data transmission system. International Business Machines Corporation, August 10, 1971: US3599103 (14 worldwide citation)

In a transmission system using a signal-phase shift to encode data, the clock for sampling of the signal for data recovery is maintained in phase with the transmitter clock by a detector which indicates the signal positions having the same voltage magnitudes at positions 90.degree. apart in the sign ...


4
Nussbaumer Henri J: Signal processing device for weighting delta coded sequences by pair wise summation of coefficients according to the matching condition of counterpart delta digits. International Business Machines Corporation, Brodie Robert B, June 4, 1974: US3814917 (11 worldwide citation)

An input analog signal is sampled and then .DELTA. coded. The resulting .DELTA. bits x(t-.tau.), x(t-2.tau.), x(t-3.tau.)- x(t-2N.tau.) are recirculated through a shift register at a frequency N times higher than the sampling frequency. The high cycling rate makes it possible to automatically multip ...


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Nussbaumer Henri J: Multiphase modulated transmission encoder. International Business Machines Corporation, November 9, 1971: US3619501 (11 worldwide citation)

A multiphase modulated transmission can be obtained with three data sets X, Y, and Z such that data elements of the set Y+Z drive two phase channels and data elements from the set Y.sup.1 +Z.sup.1, derived from the three sets X, Y, Z and selected according to a predetermined logical function, drive ...


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Nussbaumer Henri J: Digital filters. International Business Machines Corporation, Thomas Delbert C, September 16, 1975: US3906218 (6 worldwide citation)

A redesigned digital filter is disclosed which uses fewer of the costly multiplier components than conventional digital filters. Samples of the input signals are processed alternately using a multiplier common to two successive samples and a correction term is generated using successive pairs of inp ...


7
Nussbaumer Henri J: Device for calculating a bidimensional discrete fourier transform.. Ibm, January 21, 1981: EP0022513-A1 (2 worldwide citation)

Appareil pour calculer la transformée de Fourier discrète bidimensionelle d'une image de NxN échantillons. Les échantillons de chacune des rangées sont multipliés respectivement par W, n1 = 0, 1, ..., N-1 et stockés dans la mémoire (17). Un dispositif (20) en dérive N polynômes de N termes par trans ...


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