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SCOOPY+ S - User Manual
8. Annexes
8.1. Additional information on the algorithms and protocols used
8.1.1. Auxiliary data in the MPEG frames
The auxiliary data are used for the following purposes:
Reed-Solomon error detection and correction (J52 standard)
Data channel
Other auxiliary information: relay transmission.
The insertion of this auxiliary information is an extension (AETA proprietary format) to MPEG.
However, the frame structure remains compliant.
8.1.2. Reed-Solomon encoding (ISDN only)
In order to cope with possible transmission errors in the ISDN network, Reed-Solomon error correction
coding can be added, compliant with J52 recommendation. Four correction modes are available in the
SCOOPY+ S:
Mode 0: no error correction, Reed-Solomon coding disabled
Mode 1: protection of only the control information and scale factors in the MPEG frame, low
redundancy
Mode 2: protection of the whole frame, moderate (2.5 %) redundancy
Mode 3: protection of the whole frame, high (10 %) redundancy
Higher redundancy increases the protection against errors, but slightly degrades the audio quality, as
redundancy takes up part of the bit rate that could be allocated to audio coding.
Most often, for a normal quality transmission link, mode 1 is sufficient and it consumes little bit rate
from the compressed data, so it hardly impacts the audio quality.
8.1.3. H221 framing
H221 defines a framing structure that allows byte synchronisation recovery, and the transmission of
control data along with the main data.
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