Resources Contact Us Home
Sonic direction finder

Image Number 3 for United States Patent #4143351.

1. A direction finding system for determining the direction from which short sonic or ultrasonic pulses are incoming, comprising: a plurality of electroacoustic transducers forming a circular arrangement; electronic means for sequentially switching in and out pairs of diametrically opposed transducers; differential means having two inputs, respectively connected by said electronic means to said switched-in transducers, and an output for providing the differential output signal of each of said pairs; and means for deriving the phase of said output signal.

  Recently Added Patents
Mobile device mode control based on dual mapping of availability (presence) information
Canine iPS cells and method of producing same
Method and apparatus for providing seamless call handoff between networks that use dissimilar transmission methods
Display stand for a mobile tablet computer
Method and apparatus for transmitting and receiving a signal in a communication system
Light emitting device and light emitting device package
Multi-function wrench for a power tool
  Randomly Featured Patents
Security architecture with environment sensitive credential sufficiency evaluation
Three-dimensional color television
Modulator having oscillator for generating IF and RF signals by division and up-conversion
Starter having magnet switch with heat dissipation characteristics
Low-pass filter and voltage-current conversion circuit used in the same
Method and apparatus for providing location information
Method and apparatus for the analytical determination of traces
Resistor glass seal spark plug
Tool extender
Method and apparatus to disable compaction of test responses in deterministic test-set embedding-based BIST