Prism Sound Atlas Spécifications télécharger pdf (Page 32)

1.26

Operation Manual

Revision 1.00Prism Sound Atlas

5.1.4.2 Word-length

It is possible to control the word-length of the S/PDIF output using the word-length control, uppermost

in the DO1/2 strip in the Outputs tab of the Atlas Control Panel app. The control operates as follows:

Setting

Action

24 bit

All 24 bits sent to the digital output are transmitted from the S/PDIF or AES3 output.

Channel Status is set to indicate 24 bit output. This setting can be used to pass Dolby or

DTS data to an external decoder since it leaves the audio data from the host unchanged.

Note, however, that the use of Atlas's local DO mixer, or the assignable level control, or the

SRC in the digital output will prevent bit-identical data from being transmitted.

16 bit

Audio data sent to the digital output is re-dithered using flat TPDF dither to produce a 16 bit

output at the S/PDIF or AES3 output. Channel Status is set to indicate 16 bit output. This

setting is not generally preferable to the SNS settings, since the noise level is not

psycho-acoustically optimized.

SNS1

Audio data sent to the digital output is noise-shaped using Prism Sound's proprietary SNS

(Super Noise Shaping) process to produce a 16 bit output at the S/PDIF or AES3 output.

Channel Status is set to indicate 16 bit output. These settings are generally preferable to

the 16 bit setting, since the noise level is psycho-acoustically optimized. SNS1 offers the

least optimization, but with the flattest residual noise spectrum, with optimization increasing

up to SNS4, which offers the lowest subjective noise floor, but with significant colouration

SNS2

SNS3

SNS4

Note that if the audio data has already been word-length-processed for 16 bit output by the DAW

software, Atlas's word-length control should be set to 24 bits to prevent unwanted additional dithering.

For further discussion of dithering and noise shaping, and details of the SNS process, see the Dither

and noise-shaping section.

5.1.4.3 DO synchronization

Note that it is necessary to ensure that the sample clock of any digital audio device to which Atlas's

digital outputs are connected is synchronous with Atlas's own sample clock. This is usually achieved

by synchronizing the receiving equipment to Atlas's S/PDIF, ADAT or Wordclock output, but can be

achieved by synchronizing Atlas to the receiving device's clock or house sync (by setting DI or

Wordclock as Atlas's sync source).

For more information about synchronization, see the main Synchronization section , the Clocking and

jitter section, and the section describing the Unit Settings tab of the Atlas Control Panel app.

5.1.5 Output mixers and routing matrix

Atlas's output mixers are high-quality, versatile stereo digital mixers available at all of Atlas's outputs

(including the ADAT outputs). The signal processing in Atlas's mixers is as precise and sophisticated

as in a professional digital console. All coefficients are filtered at sample-rate to minimise unwanted

quantization effects such as zipper noise.

In normal operation, Atlas's output pairs are set in 'DAW' mode, i.e. they output their respective feeds

from the DAW software directly - in this case, Atlas's output mixers are disabled. By selecting 'MIX'

mode for an output pair, the mixer is enabled: its inputs comprise all eight of Atlas's analogue inputs,

the two-channel digital input, the ADAT inputs, plus the respective stereo feed from the DAW

software. Each input has a dedicated fader and pan pot, plus mute and solo buttons and

high-resolution level meter. Input pairs can be designated as 'stereo', wherein a single ganged fader

and balance pot are provided, plus a single mute and solo button. The stereo output also has fader,

mute button and high-resolution level meters.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 71 72

Commentaires sur ces manuels

Pas de commentaire

Prism Sound Atlas Spécifications Page 32

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel d'enregistrement Prism Sound Atlas