Patents by Inventor Peter Fesseler

Peter Fesseler 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: 5818928
    Abstract: In communication networks with transmission devices using analog circuitry, because of unadapted 4-wire/2-wire junctions, some of the speech of a local speaker is reflected back to the local speaker as a line echo. This line echo is neutralized by echo compensators. However, updating of the filter coefficients of the echo compensators cannot be allowed to occur unless speech of the far-end speaker is absent. Thus, recalculation of the filter coefficients must be precluded at other times. Various possibilities for detecting the speech of a local speaker are well known. According to the invention, detection of the speech of a far-end speaker is fed back to obtain an attenuation measurement of the transmission path; this received speech simulates a reduction in attenuation. From the difference between the long-time average (Aa(k+1)) and the short-time average (A(k+1)) of the attenuation, it is learned very quickly, by comparison with a threshold (THRe), whether speech is present or not.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: October 6, 1998
    Assignee: Alcatel N.V.
    Inventors: Gregor Rozinaj, Peter Fesseler
  • Patent number: 5652753
    Abstract: A low-cost implementation of a voice message system is indicated. To that end, a digital signal processor (DSP) and a second memory (ROM) with program modules for executing the functions of "automatic operator" and/or "mailbox" are integrated in a digital telephone (TE4). In addition, the digital telephone (TE4) is able to execute an "individual messages" function, whereby a message intended only for another telephone (TEA) is transmitted to this other telephone (TEA) by means of the digital telephone (TE4).
    Type: Grant
    Filed: November 20, 1995
    Date of Patent: July 29, 1997
    Assignee: Alcatel N.V.
    Inventors: Dieter Kopp, Peter Fesseler
  • Patent number: 5303346
    Abstract: Coding digitized audio signals includes dividing an audio signal, consisting of a continuous sequence of sample values, into successive blocks of equal length, and performing overlapping windowing. The blocks are transformed into complex Fourier coefficients by means of a discrete Fourier transform, which complex Fourier coefficients are decomposed into magnitude values and phase values. The phase values are quantized with a linear quantization characteristic which becomes coarser going from low toward high frequencies. The magnitude values are combined into frequency bands which are oriented with regard to predetermined critical bands and become wider toward high frequencies.
    Type: Grant
    Filed: August 5, 1992
    Date of Patent: April 12, 1994
    Assignee: Alcatel N.V.
    Inventors: Peter Fesseler, Gebhard Thierer