Resources Contact Us Home
Transmission system with improved tone detection

Image Number 6 for United States Patent #5850437.

In a transmission system, a signalling tone is transmitted by a transmitter to a receiver via a transmission channel. In the receiver, a tone detector detects the presence of a signalling tone. In order to improve a reliability of the tone detector, a number of correlating elements which determine a correlation value between an input signal and a reference signal are used. Absolute output signals of the correlating elements are added by an adder to derive a combined correlation signal to be used for detection.

  Recently Added Patents
High brightness laser diode module
Semiconductor device having vertical channel
Direct chemical vapor deposition of graphene on dielectric surfaces
Ultrathin fluid-absorbent cores
Method of making an array of nucleic acid colonies
Austenitic stainless steel welding wire and welding structure
User control of replacement television advertisements inserted by a smart television
  Randomly Featured Patents
Power umbilical comprising separate load carrying elements of composite material
Oxime substituted penems
CPP magnetoresistive effect element and magnetic storage device having a CPP magnetoresistive effect element
Camshaft adjuster
Fastener for necklaces, bracelets and other jewelry articles
Lift axle control system
Self contained control unit incorporating authorisation
Mechanical charging selection apparatus
System and method for processing extensible markup language (XML) documents
Pressure sensor, pressure-differential flow rate meter, and flow rate controller