Definitions And Standards - Tektronix MTD200 User Manual

Introduction to Digital TV Transmission Technique

Definitions and Standards

MTD200 MPEG Test Decoder User Manual
The MTD200 MPEG Test Decoder and the MTG200 MPEG Test Generator are
based on a completely new transmission technique that is currently being phased
in and has become known as the digital TV transmission technique. Not many
users of the above units will have sufficient knowledge about this new technique.
Therefore, this introductory chapter preceding the other sections of the manual is
provided to give an outline of the subject matter and to inform in detail about the
aspects relevant to the MPEG test generator and the MPEG test decoder.
The first section gives an overview of the relevant definitions and standards. The
keywords MPEG and DVB are focused upon.
The second section presents a possible transmission scenario. The fields of
application of the MPEG test generator and the MPEG test decoder are consid-
ered in particular.
The third section provides information about a special aspect of MPEG-2 (Part 1
/ Systems), which is of special interest with regard to the operation of MPEG test
generator and the MPEG test decoder.
Digital TV transmission is understood to mean the transmission of moving
pictures, sound and data from the source to the destination using digital methods.
The goal is essentially to multiply the transmission capacity by minimizing the
redundancy as well as to obtain flexibility in quality (transmission standards) and
contents (any combination of vision, sound, and data).
Implementation is made in two steps: source coding and channel coding.
Source coding and multiplexing: First, data reduction for vision and sound is
performed. Next, compressed data streams together with additional data (for
example, teletext) have to be coded to a multiplex stream. Such multiplex
streams are generated by the MPEG test generator and evaluated by the MPEG
test decoder. The required methods are defined by MPEG-2. As for additional
data, MPEG only defines the basic syntax. The European DVB project stipulates
the additional data to be integrated into the multiplex stream and their form.
1–1