DATA TRANSMISSION SYSTEM AND APPLICATION THEREOF TO THE TRANSMISSION OF ANALOGUE SIGNALS AND OF DATA IN A NETWORK WITH DELTA MODULATION

摘要

1521671 Data transmission COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT ALCATEL SA 14 March 1977 [19 March 1976] 10754/77 Heading H3H In a data transmission system, digital data is coded into a bivalent signal clocked at a frequency Fc and without any D.C. component, this signal being processed by a delta demodulator using a sampling frequency substantially higher than Fc to deliver an analogue signal which is transmitted, the reverse operations occurring at the receiver. Speech can also be sent over the same transmission path, e.g. in a telephone system, using the above delta demodulator preceded by a delta modulator, the receiver having reverse arrangements similarly.