Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Compander for TDM telecommunication system










Image Number 2 for United States Patent #3943466.

Amplitude samples of voice signals to be transmitted by pulse-code modulation are compared with a quasi-exponential reference voltage generated during each sampling interval while a binary counter receives a train of isochronous clock pulses, the reading of the counter at the instant of a match being stored in a memory for subsequent insertion into a message frame. Positive and negative signals are distinguished by a sign bit preceding the amplitude code; in one embodiment the reference voltage is sequentially generated with opposite polarities in successive halves of a sampling interval, the counter having an additional stage to generate the sign bit. Decoding at the receiving end is achieved with the aid of another binary counter whose output is compared with the amplitude code and, in the event of a match, causes the instantaneous value of a similar reference voltage to be sampled and stored for subsequent integration.








 
 
  Recently Added Patents
System of providing an internet web site that assists medical professionals draft a letter of medical necessity or other documentation for transmission to a third party payer on behalf of a pa
Method and apparatus for providing spin-home function for mobile communication terminal
Timing controller capable of removing surge signal and display apparatus including the same
Method for manufacturing non-volatile memory device, non-volatile memory element, and non-volatile memory device
Adaptive flow for thermal cooling of devices
Stool
Selected alert delivery in a distributed processing system
  Randomly Featured Patents
Cooling system for working fluid used in automatic transmission of automotive vehicle
Metallurgical method
Method and apparatus for producing transparent foil copies
Bottle Box
Flue gas scrubbing apparatus
Sharing electronic books
Conductor and wire harness
Method of manufacturing valve system for capacity control of a screw compressor
Side dump trailer
System, device and method for the manufacture and handling of a substantially pure object