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
Vehicle front fender
Hand sign
System and method for content delivery
Opioid-nornicotine codrugs combinations for pain management
Anti-phishing system and method
Image heating device
Approaching object detection system
  Randomly Featured Patents
Semiconductor device and fabrication method thereof
Image reading apparatus and information processing apparatus
Computer with a rotary module driven by magnetic forces
Method for the preparation of fentanyl
Integrated process control valve
Image display device and image display method
Water cleaned vegetable peeler
Metal material subjected to treatment for seizure prevention and method for production thereof
Releasable engagement of tool with holder
Seat belt retractor