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
Circuit arrangement for a piezo transformer, and method therefor
Decoration holder
Method of estimating remaining constant current/constant voltage charging time
RF amplifier with digital filter for polar transmitter
Motion estimation for a video transcoder
Magnetic memory element, driving method for same, and nonvolatile storage device
Apparatus and method for evaluating an activity distribution, and irradiation system
  Randomly Featured Patents
Butt type contact terminal
Method and apparatus for operating ducted fumehoods with increased energy efficiency
Image forming apparatus with cleaning mode
Endoscope system having storage part of endoscope-related-data provided in endoscope
Method of finding definitions in computer source programs
Panel-mountable part and method of dismounting such a panel-mountable part
Binocular with novel arrangement of hinge means between the telescopes thereof
Heater and memory cell, memory device and recording head including the heater
Method and apparatus for determining dynamic deformation characteristics of an object