Signal presence determination method for use in a contaminated medium
OwnerLeonard R. Kahninventor
Life of this patent
Estimating the term…
Abstract
A signal presence detection method for use in systems where a multiplicity of types of noise is expected, wherein the spectral characteristics of the input wave is compared with corresponding characteristics of the expected noise wave and wherein the determination that signal is present is made only if the input wave mismatches all of the compared noise waves' spectral characteristics. Another embodiment of the invention compares the waveshape of the input wave and the noise waveshape. As a result of this procedure, a sensitive signal presence indication is obtained which is relatively immune to noise level.
Claims16
A signal presence determination method for use in systems where a multiplicity of types of noise waves, having different spectral characteristics, are expected, comprising:
- comparing at least one spectral characteristic of the input wave with the corresponding characteristic of each of the expected noise waves, and
- making a determination that signal is present only if the input wave mismatches all of the different compared noise waves' spectrum characteristics.
A system for determining the presence of signal in a communication channel wherein a specific type of noise and/or interference is expected, comprising;
- (a) means for determining a waveshape characteristic of the input wave,
- (b) means for comparing said waveshape characteristic of the input wave with the corresponding waveshape characteristic of the expected noise and/or interference wave to determine if the input wave matches the expected noise and/or interference thus indicating the absence of signal, and
- (c) means for utilizing the result of the comparison made in the (b) means.
A method for determining the presence of signal waves in an information bearing channel as distinguished from two or more types of noise waves each of said noise waves having different distinguishable spectral characteristics, comprising:
- (a) segmenting the bandpass of the communications channel,
- (b) separately comparing the relative amplitude of the spectral segments segmented in step (a) with the predetermined spectral characteristics of each of said noise waves, and
- (c) producing an indication that signal is absent if spectral components are sensed which approximately match the relative spectral characteristics of any of said noise waves as determined in step (b).
A system for determining the presence of a signal in a system where two or more different types of noise, having different spectral characteristics, may be present, comprising:
- (a) filter means for segmenting the bandpass of the system,
- (b) a multiplicity of weighting means for adjusting the levels of each filtered segment so as to equalize the level of each type of noise expected,
- (c) a multiplicity of comparison means wherein the weighted levels produced in the means of (b) are compared and when any of the comparisons indicate a noise match a measurable condition is produced, and
- (d) means for utilizing the measured condition determined in (c) means.
A method of detecting the presence of a signal comprising:
- comparing at least one spectral characteristic of the input wave with the corresponding spectral characteristic of one or more types of noise,
- also further comparing at least one waveshape characteristic of the input waves with the corresponding characteristic of a type of noise,
- and indicating signal only if all of the comparisons made indicate mismatch.
Dependencies are inferred from the claim text.