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Prima LT USERS GUIDE

6-46-4

algorithm. MUSICAM offers the best possible combination of fidelity,

moderate delay and excellent transcoding ability at all bit rates.

MUSICAM encoding is fully compatible with all MPEG Layer II codecs,

and since the enhancements are a function of the encoder, any decoder

will sound better when connected to a Prima LT.

MUSICAM can deliver full duplex, 10.2 kHz audio on one ‘B’ channel

with 24 kHz sampling. Although a narrower bandwidth at 56 and 64

kb/s than MPEG Layer III, the advantages are higher signal-to-noise

ratio, higher transparency, lower delay, less noticeable artifacts and

better results when transcoding and post-processing. In addition, the

Prima LT allows you to send two different audio programs to two

different locating using this mode.

When using 112 or 128 kb/s, the Prima LT delivers transparent, 20 kHz

monaural or joint stereo or 10.2 kHz dual mono audio. Recommended

for all voice-over work, MUSICAM Layer II at 128 kb/s, monaural, can

stand up to extensive post-production and can be re-coded several

times before artifacts become noticeable.

At bit rates higher than 128 kb/s (not available with internal terminal

adapters) the Prima LT delivers transparent stereo with immunity to

degradation even after up to 15 cascades (at 384 kb/s).

Please note that the CCSO and CCSN algorithms in the Prima LT are all

MUSICAM algorithms, but these are used when connecting to early

CCS and MUSICAM USA products manufactured before MPEG Layer

II was standardized.

6.1.1.5 G.722

Recommended applications for G.722:

• Sports, news, traffic and weather reporting

• Call-in talk shows

• Compatibility with G.722 codecs

• Low-delay return audio for high-fidelity remotes

G.722 is one of the earliest audio coding algorithms to be standardized.

G.722 is a relatively simple algorithm based on ADPCM (adaptive

pulse code modulation) offering full duplex 7.5 kHz audio over a single

ISDN or Switched-56 channel. The key advantages of G.722 are its

compatibility with most other codecs and very low delay times. G.722

is ideal for situations where instantaneous talkback is required, such as

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