Musicam Roadrunner Bedienungsanleitung PDF herunterladen (Seite 6)

Prima LT USERS GUIDE

6-66-6

> 128 kb/s (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. Your Prima LT will not let

you set up an invalid combination from the keypad. 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. 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

!note:

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Musicam Roadrunner Bedienungsanleitung Seite 6