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
Control system for shifting an automatic transmission
Field of view matching in a visual prosthesis
Engineered nucleic acids encoding a modified erythropoietin and their expression
Method for configuring analog-to-digital converter keys and non-transitory machine readable medium storing program code executed for performing such method
Method, apparatus and computer program product for providing metadata entry
Wireless control kit for camera
Respirator belt having bumper cushion
  Randomly Featured Patents
Portion of a handset
Molten metal sampling apparatus
Presenting images in a conference system
Liquid clathrate compositions
Insulation for superconductors
Sensor system for conveyor belt
Combined digital video disc recorder and hard disk recorder
Dynamic memory supporting simultaneous refresh and data-access transactions
Contrast enhancing apparatus for video signal
Compositions and methods for minimizing adverse drug experiences associated with oxybutynin therapy