DCS dCS 904 Sample Alignment

dCS 904 User Manual	Manual for Software Version 1.5x and 1.36
dCS Ltd	June 2000

Sample Alignment

The dCS 904 aligns samples such that word clock out aligns with AES3 samples out, the rising edge of word clock aligning with the start of the first illegal code in the X,Z subframe preamble and the falling edge aligning with the start of the Y subframe preamble. The scope shots below were taken in Master mode.

Figure 16 – Word Clock and AES3 outputs, 96 kS/s

Figure 17 – Word Clock and AES3 outputs, 44.1 kS/s

When word clock in is used as a sync source, in and out are related as below. The lower waveform is the output, the upper one is the input. The misalignment is less than about 40 nsecs. The scope shots below were taken with the unit sync’d to Word clock in.

Manual part no: DOC135904 iss 2B2

Page 37

135904ma2b2.pdf file available from website

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Contents

© 1997, 1999, 2000 dCS Ltd PRODUCT FEATURES Page CONTENTS About this Manual USING YOUR dCS 904 FOR THE FIRST TIME Product Overview What’s in the Box Mains Voltages Installing Unit in a Rack Getting Started Page THE HARDWARE – CONTROLS AND CONNECTORS Rear Panel SDIF/DSD Clk In SDIF/DSD Clk Out Figure Remote In & Out 9 pin D type male (2 off) Front Panel “Word Length Reduction” Overload Level Menu Step blue Set Master/Slave Down Master Clock Sample dCS 904 Sample Rate (kS/s) Rate (kS/s) The Software the Menu” DSD AES O Sample Rate Display Error Codes and Messages “Internal Device Error Codes” on page 74 for THE SOFTWARE – THE MENU Overview The Menu Sequence Menu Items DSD O Tone “RS-232 Remote Control Interface” Test “Error Codes and Messages” 7-Seg Heat “Operating Conditions” Ref In A-SL Offst Loc End Using a dCS 904 to output DSD Using a Master Clock to Sync a dCS Storing DSD on an 8 track 16/44.1 PCM Recorder Six Channel PCM Set Up Storing 6 channel DSD on a 24 track 16/44.1 PCM Recorder Operating Several Units on One Remote Chain 8 Channel P3D DSD Set Up with Monitoring Page dCS 904 TECHNICAL INFORMATION Anti Alias Filtering Clocking DSD E2 spec E3 spec DSD Full Scale DSD Mute DSD Overload Behaviour Page Page Page Sample Alignment Page Page Page Noise Shaping Page Page Digital Interface Specifications Analogue Input Specifications Digital Data Formats Supported AES3 (AES/EBU) Format Page Page SDIF-2 SDIF-2Messaging DESCRIPTION Definition Default Message DSD on SDIF-2 DSD on SDIF-3 RS-232Remote Control Interface Transmit Message Acknowledge Message Example : Special Commands and Protocols Command Streams Example: Switching to 96k PCM Page Example: Switching to P3D Page Page Page Power Consumption Size and Weight Operating Conditions GENERAL TECHNICAL INFORMATION Word Length Reduction xTruncation Type Noise with 44.1 kS/s data unweighted F weighted What does it look like Page OPTIONS Page MAINTENANCE AND SUPPORT Hardware Software Hardware Update or Calibration Warranty Safety and Electrical Safety Page TROUBLESHOOTING Error Codes and Messages Internal Device Error Codes System Messages and Error Codes Trouble Shooting Your System One output channel is low or absent Clicks or crackles occur on the outputs The unit fails to slave to a Master Clock The unit slaves to Word Clock but not AES/EBU The Overload indicator will not go out I wish If You Need More Help Other Information Page INDEXES AND SOFTWARE VERSION NUMBERS Definitions of Units Full Contents Page Page Tables Figures Keywords and Phrases