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
Computer system for routing package deliveries
Method of sending CTI messages in a communication system
Differentiated PSIP table update interval technology
Random access point (RAP) formation using intra refreshing technique in video coding
Distylium plant named `PIIDIST-I`
Method and apparatus for controlling a multi-node process
  Randomly Featured Patents
Rain guard for a bird feeder
Computer system housing for attenuating electromagnetic inferference (EMI)
Elevator group supervisory control system
Copper cored enclosures for hybrid circuits
Device for the automatic examination of blood samples
Modular mobile accessory for mobile device
Method of operating a shunt-wound DC motor as well as controlling device for the execution and application thereof
Fabrication of field-effect transistor with vertical body-material dopant profile tailored to alleviate punchthrough and reduce current leakage
Multi-pin socket
Systems and methods for ion mobility control