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CDQPrima USERS GUIDE

6-66-6

> 128 kb/s (Layer III not available with internal terminal adapter):

Algorithm Sample

rate

Mode Bandwidt

Delay Cascade

MUSICAM 48 kHz JS 20 kHz low excellent

MUSICAM 48 kHz DM 20 kHz low excellent

Layer III 48 kHz JS 20 kHz long good

Layer III 48 kHz DM 20 kHz long good

Other combinations of algorithm, mode, bit rate and sample rate are

possible, but not all combinations are valid. You should be careful when

using a remote control device since there is no check on parameter

validity when configuring through the remote control port. If you get

an error message such as “BAD TOGGLE ON…” or “INVALID

PARAMETERS”, it is because you have entered an invalid combination.

Refer to the CDQPrima Technical Reference Manual for valid bit and

sampling rate combinations.

Please remember that MUSICAM is a fully compatible enhancement to

the ISO/MPEG Layer II standard algorithm. Since the ISO standard

defines the encoded bit stream, and hence the decoder, all

enhancements are to the encoder. Therefore, when connecting to a

standard Layer II codec at the far end, the audio you hear will be Layer

II, but the audio heard at the far-end will be MUSICAM enhanced.

MUSICAM encoding makes any Layer II decoder sound better.

Layer III provides the widest bandwidth at low bit rates, up to 15 kHz

at bit rates of 56 or 64 kb/s. Layer III may be useful at these low bit

rates when wide bandwidths are required and connection costs are a

factor. However, even at high bit rates, Layer III has long delay, does

not cascade well and is adversely affected by post-processing. There is

no advantage to using Layer III over MUSICAM. In some applications,

Layer III may provide better audio than standard Layer II, but in most

applications, MUSICAM has been judged to be the superior algorithm.

6.1.2 Pre-Programmed Quick Configurations

Keeping in mind that Speed Dial entries contain all information

required to fully configure the encoder and decoder sections, Quick

Configurations are simply Speed Dial entries that do not dial. Since no

dialing is performed, you do not need to have an internal terminal

adapter to take advantage of Quick Configurations.

!note:

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