EQUALIZER CIRCUIT FOR DATA TRANSMISSION SYSTEM
Original Publication Date: 1976-Apr-30
Included in the Prior Art Database: 2004-Mar-27
Xerox Disclosure Journal
An equalization apparatus is shown above for use in a trans~ mission system in which a train comprising a predetermined number of discrete test pulses is transmitted either from a separate pulse source 11 or from a data source 12 prior to the transmission of any data. The series train of pulses may be modulated by an FM modulator 14 and transmitted over a channel 15 having a limited bandwidth capability, such as an ordinary telephone line. The transmission channel 15 introduces frequency dependent phase delay and amplitude attenuation to the test pulses before they are received by the receiver.