Resources Contact Us Home
Bilateral digital data transmission system

Image Number 18 for United States Patent #4519083.

A digital data transmission system for transmitting digital data from digital data handling hardware over a transmission line by analog signal representation and for receiving analog signal representation for reception of digital signals by the digital data handling hardware, incorporates an integrated circuit PSK modem. The modem has a transmitter which includes an encoder for encoding digital data into a first format for conversion to corresponding PSK signals and a transmitter modulator, implemented in switched capacitor circuits, for phase modulating a first carrier frequency according to the first format. The modem has a receiver that includes a demodulator, implemented in switched capacitor circuits, for demodulating PSK signals on a second carrier frequency to provide a second format for conversion to corresponding digital signals, and an encoder for encoding the second format into corresponding digital signals. In the preferred embodiment, the transmitter includes a buffer for the accommodation of a variety of modem protocols, a first filter for compensation of gain distortion in the transmission line, and a second filter for compensation of phase distortion in the transmission line. In this preferred embodiment, the receiver includes compensating filters for transmission line gain and phase distortion, automatic gain control and adaptive equalization filtering for reducing cross-talk noise between the transmission and receiving lines.

  Recently Added Patents
Data output apparatus and data output method
Scalable encoding apparatus, scalable decoding apparatus, scalable encoding method, scalable decoding method, communication terminal apparatus, and base station apparatus
Portable electronic device housing including hinge
Organic elelectroluminescent display
Supplier capability methods, systems, and apparatuses for extended commerce
Enhanced claims damage estimation using aggregate display
Cabinet door with tread pattern
  Randomly Featured Patents
Plasma display panel and driving method thereof
High performance stem for arthroplasty
External cathode ion source
Method and delivery system for the carbon dioxide-based, area specific attraction of insects
Apparatus for efficient processing of tissue samples on slides
Method and apparatus for interactive television through use of menu windows
Bi-directional pen changer
Boat hook
Compact, hybrid fiber reinforced rods for optical cable reinforcements and method for making same
Mattress with vertical handles