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
Systems and methods for velocity profile based approach to point control
Information obtaining and notification, data message forwarding and handover method and access node
Carbon dioxide capture system and methods of capturing carbon dioxide
Methods and systems for delivering customized advertisements
Resistor-2 resistor (R-2R) digital-to-analog converter with resistor network reversal
Chair
Fabricated leaf tea products
  Randomly Featured Patents
Oligonucleotide antagonist for human tumor necrosis factor .alpha. (TNF-.alpha.)
Remote measurement of near-surface physical properties using optically smart surfaces
Protection domain groups to isolate access to memory windows
Apparatus for correcting time base error of video signal
Electrical device having atmospheric isolation
Mobile radio transmission system with integrated measuring device for measuring the radio coverage area
Hands free controller for video games
Incision closing clip
Radiation source module
Footwear, such as athletic shoe