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
Binder for secondary battery providing excellent adhesion strength and cycle property
Method and apparatus for increasing query traffic to a web site
Image processing apparatus and method having defective pixel detection and correction ability
Containers having radio frequency identification tags and method of applying radio frequency identification tags to containers
Methods and system for providing drug pricing information from multiple pharmacy benefit managers (PBMs)
Method and system for video parameter analysis and transmission
Systems and methods for providing power and data to lighting devices
  Randomly Featured Patents
Circuit module and process for producing the same
Apparatus and process for casting large concrete boxes
Joystick control unit using multiple substrates
Clutch mechanism
Radio receiver having phase locked loop frequency synthesizer
Drive system for hybrid electric vehicle
Scanning apparatus utilizing gravity acceleration for scanning
Putter head
Power actuated gun with fastener feeding track and automatic firing
Expansible fishing lure with automatic hook