Resources Contact Us Home
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
Display screen or portion thereof with graphical user interface
Efficient forward ranking in a search engine
Magnetic detection of small entities
OFDM control signaling in the presence of timing asynchronization in a peer-to-peer network
Semiconductor device and method of manufacturing the same
Hair motion compositor system for use in a hair/fur pipeline
Emergency call notification for network services
  Randomly Featured Patents
High efficiency sensible and latent heat exchange media with selected transfer for a total energy recovery wheel
Pharmaceutical composition containing 24,25-dihydroxycholecalciferol in methods of treatment
Mobile information terminal
Device for regulating discharge of sand from a vehicle sander
Method for horizontal installation of LGA socketed chips
Melanoma detection device
Continuous gel casting method and apparatus
Footwear upper
Power supply assembly
Integrated wound dressing system