A digital video system for the CATV industry

Author

Kirk, Donald ; Paolini, Michael J.

Author_Institution

St. Petersburg Communications Corp., St. Petersburg, Fla.

Volume

58

Issue

7

fYear

1970

fDate

7/1/1970 12:00:00 AM

Firstpage

1026

Lastpage

1035

Abstract

A ditigal pulse code modulator (PCM) system is proposed to implement long-haul video system for the CATV industry. A comparison is made between PCM system and wide-band FM system in terms of repeaterability versus additional occupied signal bandwidth. This is followed by a noise analysis of coaxial cable to determine the correct PCM format and bit information rate. An 80- megabit system is selected, which uses an 8-bit code in a four-level, eight-level, eight-level pulse sequence per video sample. The selected PCM system is then evaluated for its performance on both a long-haul cable system and a long-haul microwave system. Performance calculations are made on a 500-mile cable system in terms of error rate and its related video signal-to-noise ratio. Repeater spacings are computad for various configurations, including the replacement of the digital regenerators with analog amplifiers. Additional performance calculations are then made on a 3000-mile microwave system, including the effect of simultaneous Rayleigh fading.

Keywords

Bandwidth; Coaxial cables; Error analysis; Information analysis; Information rates; Modulation coding; Phase change materials; Pulse modulation; Repeaters; Wideband;

fLanguage

English

Journal_Title

Proceedings of the IEEE

Publisher

ieee

ISSN

0018-9219

Type

jour

DOI

10.1109/PROC.1970.7846

Filename

1449776