Video signal enhancement using fine structure pre-emphasis with modulo limiting

Document Type

Conference Proceeding

Publication Date

12-1-1989

Abstract

Companding is required in temporal or vertical pre-emphasis to realize the potential SNR improvement. A modulo limiter (ML) is a nonlinear device which maps the input signal to a predetermined output range. If the input falls within the predetermined output range, no change is made to the input signal and the output equals the input. If the input falls outside the predetermined output range, a DC offset equal to the length of the predetermined output range is repeatedly added to or subtracted from the input until the result falls inside the predetermined output range. Analysis shows that a modulo limiter can be incorporated in the pre-emphasis filters to limit the pre-emphasized signal amplitude to within the range of the input signal from - 1/2 to 1/2 volts. The reduced dynamic range will alleviate stringent requirement on companding.

Identifier

0024896448 (Scopus)

ISBN

[0819402389]

Publication Title

Proceedings of SPIE the International Society for Optical Engineering

ISSN

0277786X

First Page

620

Last Page

630

Volume

1199 pt 2

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