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
IC layout parsing for multiple masks
Systems and methods for managing fleet services
Method, apparatus and computer program product for visualizing whole streets based on imagery generated from panoramic street views
Sensor chip, sensor cartridge, and analysis apparatus
Resistive memory element sensing using averaging
Layout design defect repair based on inverse lithography and traditional optical proximity correction
Methods and kits for predicting the responsiveness of hepatocellular carcinoma patients to 5-fluorouracil-based combination chemotherapy
  Randomly Featured Patents
Method of forming hydrogel particles having a controlled size using liposomes
Non-volatile memory incremental counting system
Adjustable optical mount with locking devices and methods
Roll forming machine and method for changing rolls
Apparatus and method for treating female urinary incontinence
Tungsten impregnated casting mold
System and method for tracking changes associated with incremental copying
Apparatus and method for reducing delays due to branches
Repair device for printed circuit board