Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
1999-03-11
2001-05-08
Jeanpierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S111000
Reexamination Certificate
active
06229471
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is based on a method for detecting a pulse-usable signal wherein a frequency-limited input signal is generated from an analog input signal through filtering, which is adapted to the useful signal to be detected, and the useful signal is determined from the frequency-limited input signal by an integration operation.
In electrical engineering, particularly in telecommunications, it is often necessary to detect a pulse-usable signal contained in an extremely noisy, analog electrical input signal in order to evaluate the pulse-usable signal. An obvious solution is to first filter the input signal with a low-pass filter or a band-pass filter whose limit frequencies are adapted to the bandwidth of the usable signal. The result of this process is an input signal that is limited in frequency, but in which it is still frequently impossible to detect the usable signal, because an excessive noise component is present. This component can be eliminated through an integration of the frequency-limited input signal with an integration constant that is optimized to correspond to the usable signal to be detected.
It is the object of the invention to provide a generic method that permits a reliable detection of a usable signal containing the highest frequency components and a large noise component, in combination with a high instantaneous bandwidth.
SUMMARY OF THE INVENTION
The above object generally is achieved according to the present invention by a method for detecting a pulsed useful signal with a frequency-limited input signal being generated from an analog input signal through filtering, which is adapted to the useful signal to be detected, and the useful signal is determined from the frequency-limited input signal by an integration operation, Wherein: initially, a sequence or series of digital phase values with a specifiable word length is formed from the frequency-limited input signal by an amplitude-limiting phase/digital conversion; a sequence or series of first phase difference values is formed from each two respectively adjacent phase values; a sequence of second phase difference values is formed from respectively two first phase difference values with the aid of a difference formation; the associated absolute amounts for the second phase difference values are formed; and, the absolute amounts are supplied to a digital low pass filter with a predetermined integration time, which is adapted to the useful signal to be detected, with the useful signal to be detected being generated at the output of the low pass filter. Advantageous embodiments and/or modifications ensue from the further disclosure.
A first advantage is that the frequency-limited input signal is digitized, and the detection of the usable signal is purely digital.
A second advantage is that a reliable detection is possible, even with a minimal signal
oise ratio of 2 dB.
Further advantages ensue from the description below wherein the invention is described in detail by way of embodiments, with reference to schematic figures.
REFERENCES:
patent: 5907298 (1999-05-01), Kiriyama et al.
Daimler-Chrysler AG
Jean-Pierre Peguy
Kunitz Norman N.
Venable
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