Resources Contact Us Home
Method and device for comparing two variable analogue signals

Image Number 3 for United States Patent #5305243.

A device compares two variable analogue signals, e.g. varying in time, such as audio or video signals. The signals, which are either different or identical but shifted in time, are within a predetermined frequency range. The device includes two parallel channels for processing analogue signals. One of the channels introduces a time shift of one signal with respect to the other, the shift being equal to a 1/4 period at the center frequency of the band. Both channels include in series circuits for transforming the analogue signals into binary logic signals, a logic circuit, a summing circuit for establishing a first and second correlation signal. An adder adds the absolute values of the first and second correlation signals to form a third correlation signal that is substantially independent of any time shift between the analogue signals.

  Recently Added Patents
System and method of error reporting in a video distribution network
Account and customer creation in an on-line banking model
Detection of procedural deficiency across multiple business applications
Hypallergenic mosaic antigens and methods of making same
Formation of an optical waveguide
Display screen or portion thereof with animated graphical user interface
  Randomly Featured Patents
Luminous display element with a light coupled into a light conducting housing
AURA devices and methods for increasing rare coin value
Method and apparatus for loading configuration data
Undershoot hardened FET switch
Flow rate control valve system
Pressure-sensitive tape machine with stripper
Board-on-chip packages with conductive foil on the chip surface
Substantially isotropic magnetic recording medium comprising a seedlayer
Multiple site olefin polymerization catalysts
Flame holder for minimizing combustor screech