Patents by Inventor Wolfgang F. G. Mecklenbrauker

Wolfgang F. G. Mecklenbrauker has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4435774
    Abstract: Method of a N-point discrete Fourier transform. The original set, consisting of N input signal values {a(k)}k=0,1,2, . . . N-1 is converted into two sets of signal values {b.sub.1 (q)}q=1,2, . . . M and {b.sub.2 (q)}q=1,2, . . . M, which each comprise M=(N-1)/2 signal values, each value being a linear combination of two of the original input signal values a(k). These sequences are circularly convolved with the impulse response h.sub.1 (v)=.alpha.cos((2.pi./N) g.sup.V) and h.sub.2 (v)=j.beta.sin ((2.pi./N) g.sup.V), respectively, for generating a set of third data elements y.sub.1 (p) and a set of fourth signal values y.sub.2 (p). Herein N is a prime and .alpha.,.beta. and g represent constants and it holds that p, v=1,2, . . . M, whereas j=.sqroot. -1. The desired output signal value can be obtained by means of a linear combination of the signal values y.sub.1 (p), y.sub.2 (p) and a(0).
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: March 6, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Theodoor A. C. M. Claasen, Wolfgang F. G. Mecklenbrauker
  • Patent number: 4318086
    Abstract: An analog-to-digital converter is described for converting an analog-signal into a sequence of (b+a)-bit code words by means of a b-bit auxiliary analog-to-digital converter. To reduce the quantizing noise resulting from the requisite quantizing of the analog signal samples this analog signal is applied to an integrating network whose output is connected to an amplitude-limiting device which brings the integrated signal within the signal range of the auxiliary analog-to-digital converter, which in its turn produces a sequence of b-bit code words which are applied to a digital output filter via a cascade arrangement of an amplitude-restoration device and a difference network.Sampling pulses which occur at a frequency exceeding the Nyquist sampling frequency associated with the analog signal are applied to the auxiliary analog-to-digital converter.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: March 2, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Johannes B. H. Peek, Wolfgang F. G. Mecklenbrauker, Theodoor A. C. M. Claasen, Nicolaas van Hurck
  • Patent number: 4306222
    Abstract: A digital-to-analog converter is described for converting (b+a)-bit code words into an analog signal by means of a b-bit auxiliary digital-to-analog converter. In order to reduce the quantizing noise introduced by the indispensible quantizing of the (b+a)-bit code words for obtaining the b-bit code words these (a+b)-bit code words are applied to an integrating network which has its output connected to an amplitude-limiting device which brings the integrated signal in the signal range of the auxiliary-D/A converter. The output signal of the amplitude-limiting device is now quantized and this quantizing signal is applied to the auxiliary D/A converter which produces analog output signal samples which are applied to, possibly, an analog output filter through a cascade arrangement of an amplitude-restorer and a difference network.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: December 15, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Johannes B. H. Peek, Wolfgang F. G. Mecklenbrauker, Theodoor A. C. M. Claasen, Nicolaas Van Hurck
  • Patent number: 4131764
    Abstract: A multiplex system has an inverse Fourier transformer that is unequal to its forward one, therefore an optimum distribution of elements is possible.
    Type: Grant
    Filed: August 4, 1977
    Date of Patent: December 26, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Theodoor A. C. M. Claasen, Wolfgang F. G. Mecklenbrauker