Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Apparatus for providing location information of hand-held device and method thereof
Nonvolatile semiconductor memory device and method for manufacturing the same
Mirror drift compensation in an optical circuit switch
Automatic setup of reflector instances
Plants and seeds of corn variety CV778791
Rear bumper for an automobile
Luggage cart
  Randomly Featured Patents
Sterilizing apparatus and manufacturing apparatus for liquefied product
Method and device for matrix assisted laser desorption ionization of substances
Balanced variable reactance circuit and method of producing the same
Rotating control device with replaceable bowl sleeve
Control mechanism for fuel injection pump
Installation for sorting out reject slugs out of the slug channel of an automatic coining machine
Retinoscope
Method for firing direct-fired burner
Electron microscope system and method for evaluating film thickness reduction of resist patterns
Quality index for quality assurance in software development