Koninklijke Philips Corporation N.V.

U.S. Philips Corporation

Christinus Johannes Van Valburg

Hendrik Ten Pierick

Petrus C Sommen

In a waveform generator, a repetitive non-linear waveform is generated by varying the number supplied to a pulse reduction circuit during the repetition period. Consequently, the pulse reduction circuit supplies a number of desired output pulses, which number varies in time corresponding to the varying number. For example, when a lower number is inputted to the pulse reduction circuit during a sub-period of the repetition period, a corresponding lower number of output pulses will be generated. Consequently, a lower number of increment values will be summed or integrated during this sub-period and the waveform changes less steeply.

Generating a non-linear waveform

Adaptive discrete-time filters, as used, for example, in echo cancellers responsive to input signals, more specifically speech signals, which can be modelled with an autoregressive process of the order of p, a control circuit for controlling the coefficients for adjusting a discrete-time transversal filter in accordance with an algorithm which requires the same amount of computation as the Least Mean Square (LMS) algorithm but leads to the same or better convergence results for this type of signals than the Orthogonal Projection (OP) algorithm.

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Eindhoven, Netherlands

Christinus Johannes Van Valburg