SPECIFICATIONS FOR A COBI DATA TRANSMISSION MODEM
Abstract
The COBI Data Transmission Modem is a 1200 bit/second coded phase reversal system. The term COBI is an acronym for Coded Biphase. COBI utilizes a double side-band phase reversal modulation with a carrier centered at 1500 cps. The 1200 bit/second data are recorded into a 1500 digit/second data stream. Actual phase modulation is accomplished at a 1500 baud rate. Coding is accomplished by converting every four input data hits into a five-bit character. Each conversion is unique. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 18, 1961
- Accession Number
- AD0261546
Entities
People
- E.j. Hofmann
Organizations
- Massachusetts Institute of Technology