NAB

National Association of Broadcasters

NAM

Non-Additive Mix

NBC

National Broadcasting Corporation

NFS

Network File System

NHK

Nippon Hoso Kyokai  (Japanese Television Network)

NIC

Network Interface Card

NICAM

Near Instantaneous Companded Audio Multiplex

NIH

Not Invented Here...

NIST

National Institute of Standards and Technology

NLE

Non-Linear Editor

NPRM

Notice of Proposed Rule Making

NRZ

Non-Return to Zero

NRZI

Non-Return to Zero Inverse (or Inverted)

NTSC

National Television System Committee

NVOD

Near Video on Demand