dCS 904 User Manual | Manual for Software Version 1.5x and 1.36 |
dCS Ltd | June 2000 |
|
|
Front Panel
24 | BIT | Sample | Multiplier | Mute | Word | Noise | Overload | Overload | ADC/ | Master Slave | Output | DSD | Sample Rate |
| Rate | Length | Shaping | Level | Data | Format | |||||||
192kHz |
|
|
|
|
|
|
|
|
|
| Direct Stream Digital |
| |
|
|
|
|
|
|
|
|
|
|
| |||
MENU |
| dC S |
Step Set | kS/s |
|
dCS 904 A to D Converter |
| Data Conversion Systems |
Figure 2 – Front Panel
The dCS 904 uses a combination of front panel buttons for frequently changed functions and a step through menu for features you might set and forget.
Sample RateMultiplierThe 2 buttons on the left side of the front panel select the sample rate. Press the Sample Rate button repeatedly to cycle through the sample rates in the order:
192 ... 176.4 ... 96 ... | 88.2 ... 48 ... | 44.1 ... | 32 ... | 192 ... | etc. |
To step through more quickly, press the Multiplier button repeatedly to cycle through in one of the following sequences, depending on the starting sample rate:
48 ... | 96 ... | 192 | ... | 48 ... | 96 | ... | 192 ... | etc. |
44.1 … | 88.2 ... | 176.4 | ... | 44.1 ... | 88.2 | ... | 176.4 ... | etc. |
To change sample rates quickly, use the two buttons together. For example, to change from 176.4 kS/s to 192 kS/s press Sample Rate once then Multiplier once. Do not press the buttons too fast as a delay is built in to the software. The sample rate selected is shown on the LED display in the centre of the panel.
MuteThe Mute button forces a mute, in addition to the automatic ones. The digital outputs are automatically muted at power up and when the sample rate is changed or the unit is locking to a reference source. A forced mute is indicated by the mute LED (above the mute switch) lighting up. In normal use, pressing the Mute button mutes the digital outputs and lights the mute LED. Pressing the Mute button again unmutes the ADC, as long as no automatic mute is being applied.
| Word Length |
|
Noise Shaping | Menu Back |
The AES/EBU format accommodates data up to 24 bits. If a shorter word is needed and the extra bits are just ignored, the result is typical “digital” sound due to the abrupt chopping off of the low level signal information.
To avoid this, the dCS 904 allows proper truncation of the data and uses Noise Shaping to maintain low level performance. See the section on “Word Length Reduction” on page 64 for some background on this. If you do use word length truncation, make sure that Noise Shaping is not set to OFF without realising it.
Manual part no: DOC135904 iss 2B2 | Page 12 | 135904ma2b2.pdf file available from website |
Contact dCS on + 44 1799 531 999 | email to: more@dcsltd.co.uk |
(inside the UK replace + 44 with 0) | web site: www.dcsltd.co.uk |