1
Ludwig Desire Johan Eggermont, Hendrik Arie Van Essen, Petrus Josephus Van Gerwen, Wilfred Andre Maria Snijders: Interpolating digital filter. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, October 26, 1976: US03988607 (22 worldwide citation)

An interpolating non-recursive digital filter in which the circulating storage device which has a periodically changing storage time, is controlled by a clock-pulse generator, and has an output circuit whereby within one input sampling period the input code words stored in the storage device are sup ...


2
Ludwig Desire Johan Eggermont: Signal processor with digital filter and integrating network. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, April 5, 1977: US04016410 (20 worldwide citation)

System comprising an integrating digital signal processing device to which input signal samples x(nT) are supplied with a period T and which supplies output signal samples z(mrT) with a period rT. To this end in this integrating signal processing device consecutive groups having a period rT and cons ...


3
Ludwig Desire Johan Eggermont: Digital filter device for processing binary-coded signal samples. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, October 26, 1976: US03988606 (18 worldwide citation)

A digital filter is described in which the filter coefficients which differ from zero are coded in unequal numbers of multipliers which are equal to 2.sup.n and in which immediately after each multiplication of a given signal sample by the multipliers of the relevant filter coefficent a new signal s ...


4
Ludwig Desire Johan Eggermont: Digital converter from delta-modulated signals into PCM signals. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, January 11, 1977: US04002981 (11 worldwide citation)

A digital circuit arrangement for directly converting compressed DM or DPCM signals into PCM signals, comprising a digital filter and a step size control circuit in which a DM bit or a DPCM code word and the associated step size code word are simultaneously applied to the digital filter.


5
Ludwig Desire Johan Eggermont, Eise Carel Dijkmans, Karel Riemens: Delta-modulation encoder. U S Philips Corporation, Frank R Trifari, Henry I Steckler, August 22, 1978: US04109203 (5 worldwide citation)

In a delta-modulation encoding arrangement having step-size control drift voltages and miss-match between the charge and discharge pulses for the first integrating network in the feedback circuit produce an additional DC voltage on this integrating network. This additional DC voltage is compensated ...


6
Ludwig Desire Johan Eggermont: Interpolating non-recursive digital filter. U S Philips Corporation, Steven R Biren, Frank R Trifari, October 4, 1977: US04052605 (3 worldwide citation)

An interpolating non-recursive digital filter for generating output signal samples which occur at a given output sampling frequency and which are related in a predetermined way to a sequence of input signal samples has an output sampling frequency which is an integer multiple of the frequency of the ...


7
Ludwig Desire Johan Eggermont, Anton Hendrik Wevers: Receiver for the reception of signals transmitted by delta modulation. U S Philips Corporation, Frank R Trifari, Simon L Cohen, August 2, 1977: US04039955 (2 worldwide citation)

A receiver in an adaptive pulse code modulation transmission system is provided with a pulse pattern analyzer which is responsive to at least two sequential information pulses, and a correction circuit controlled by the pulse pattern analyzer for correcting the last transmitted pulse group.


8
Ludwig Desire Johan Eggermont, Karel Riemens: Pulse code modulation with dynamic range limiting. U S Philips Corporation, Frank R Trifari, Simon L Cohen, August 2, 1977: US04039949 (1 worldwide citation)

The invention relates to transmission systems with dynamic compansion for the coded transmission of speech signals. By the use of a limiting device in the dynamic control circuit of the receiver the intelligibility is improved. The limiting device is such that the dynamic range of a transmitted sign ...



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