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
Hanger
Light-emitting device package and method of manufacturing the same
Method and apparatus for generating soft bit values in reduced-state equalizers
Aqueous flowable concentrate compositions of a microencapsulated dinitroaniline herbicide
Image forming system, printing control method, and program
Method of controlling an indentation depth of an electrode into a metal substrate during welding
Bisphosphonate compounds
  Randomly Featured Patents
Putter face
Autoinjector with deactivating means moveable by a safety shield
Multi-vitamin and mineral supplements for women
Copy paper supply timing control in a copying machine
Glass compositions
Microwave dielectric porcelain composition
Power line signalling system
High strength adhesives, films and coatings
A microsequencer circuit with plural microprogrom instruction counters
Golfing accessory