User manual PRISM SOUND DREAM DA-1

[. . . ] Prism Dream Operation Manual Issue 1. 1 12 February 1996 Prism Media Products Limited William James House Cowley Road Cambridge CB4 4WX UK Phone: +44-(0)1223-424988 Fax: +44-(0)1223-425023 Email: 100612. 1135@compuserve. com Prism Media Products Limited Operation Manual Dream CONTENTS 1. Input selection or maximum output level setting indicators . Interconnect screens - the pin 1 conditions . 5 5 5 7 7 7 8 9 9 10 11 11 12 12 12 13 13 13 14 15 15 18 19 23 23 26 26 4. 5. 6. 7. 8. INTERNAL CONFIGURATION OPTIONS AND FUSES . [. . . ] 32kHz, 44. 1kHz and 48kHz indicators If the operating sample rate is within the capture range of the high precision PLL then one of these indicators will indicate the sampling frequency. The indicator will flash if the unit has lost the source of synchronization and defaulted to free-run from the internal clock. `Other' indicator This indicator will illuminate if the unit is externally synchronized but the sample rate is outside the range of the high precision PLL. `Master' indicator LED off: Sync OK - external synchronization selected with no errors LED flashing in time with one of the frequency indicators: No Sync - external synchronization selected but failed LED on: Clock master mode - either no input or the input is correctly synchronized to the DA-1 master LED mostly on but occasionally blinking off: Sample slipping in master mode - each blink corresponds with a missed or repeated audio sample Issue 1. 1 12 February 1996 © Prism Media Products Limited Page 12 of 28 Prism Media Products Limited Operation Manual Dream 6. 6. 1. CONNECTORS Analogue output connections Conventional connections to a balanced analogue input should use a screened twisted pair lead. The DA-1 output pins 2 and 3 should be wired to the two conductors of the pair and pin 1 to the cable screen. The other end of the cable should be connected in a similar manner with the screen connecting to the chassis of the analogue input. The DA-1 should be connected to an unbalanced input using only pins 1 and 2 of the output XLR. Pin 2 should connect to the signal input and pin 1 should connect to the input ground. Using this method the signal level is half the nominal value. NOTE: It is possible to drive unbalanced inputs from pins 2 and 3 of the DA-1 analogue output but, because the connection has been unbalanced, this will give slightly worse performance. However, if the output is connected in that way, it is important that pin 1 is not connected at the unbalanced input end as this will short circuit one leg of the floating output driver. 6. 2. Interconnect screens - the pin 1 conditions `Screen' connects directly to the chassis for the digital XLR and BNC connectors. The RCA digital coaxial connections are transformer isolated with the screen coupled to the chassis using a capacitor at the connector. The analogue output screens are the mid points of the floating differential outputs. They are coupled to the chassis using a capacitor from pin 1 to the chassis. Issue 1. 1 12 February 1996 © Prism Media Products Limited Page 13 of 28 Prism Media Products Limited Operation Manual Dream 6. 3. Connector table Viewed from the rear the connectors are as follows: Left Hand Side IEC320 XLR-Male XLR-Male XLR-Female XLR-Female XLR-Female OPTICAL RCA-phono BNC-75S BNC-75S BNC-75S BNC-75S BNC-75S BNC-75S RCA-phono OPTICAL XLR-Male Right Hand Side XLR-Male Digital Outputs Digital Inputs Analogue Outputs Mains power inlet Analogue out left/A Analogue out right/B DI1 - AES3 DI2 - AES3 DI3 - AES3 DI4 - IEC958 optical DI5 - IEC958 coaxial DI6 - AES-3ID or L - SDIF-2 input left/A DI7 - AES-31D or R - SDIF-2 input right/B WCK - Word-clock input L - SDIF-2 output left/A R - SDIF-2 output right/B WCK - Word-clock output IEC958 consumer format IEC958 consumer format DO1 - AES3 output 1 DO2 - AES3 output 2 XLR wiring conventions for both analogue and digital connections are: pin 1 Screen pin 2 Balanced input or output (Hot or `+') pin 3 Balanced input or output (Cold or `-') Issue 1. 1 12 February 1996 © Prism Media Products Limited Page 14 of 28 Prism Media Products Limited Operation Manual Dream 7. 7. 1. SPECIFICATION Digital Inputs General (except SDIF-2) 7. 1. 1. Jitter Tolerance Above 12kHz: 50Hz to 12kHz: 0. 5UI (This is 88. 6ns at Fs = 44. 1kHz) Increases with falling jitter frequency. eg: 0. 75 UI at 8kHz 30 UI at 200Hz Below 50Hz: > 128UI (22. 7 us at Fs = 44. 1kHz) Note: Jitter tolerance is a measure of the ability of a receiver to correctly decode a digital interface signal which has jitter. Like most other jitter parameters it is normally measured in unit intervals. A unit interval (UI) corresponds to the smallest nominal time interval in the interface signal, for the AES3 or IEC958 interface formats there are 128 unit intervals per sample. Therefore at a sample frequency of 44. 1kHz the unit interval is 177 ns. References 5 and 6 explain interface jitter in more detail. Digital Input Resolution/Word-Length: 24 bits The Dream resolves all the data bits of the digital interface formats. Input signals are not truncated and hence truncation distortion does not occur. For example: a sine wave only modulating the lowest 4 bits of the 24 bit interface signal is reproduced at the correct amplitude. Note that, in conformance with the digital audio interface specifications, all signals with consumer channel status, and signals with professional channel status that indicate that the auxiliary audio data bits do not carry the main audio signal will have the lower 4 bits masked off to avoid non-audio data adding to the audio. [. . . ] Fuses There is one mains fuse in the IEC320 mains inlet. If this fuse is blown it should be replaced by a similar value and type. (20x5mm 250V 2AT anti-surge) There are seven fuses internal to the unit. If these fuses have blown a fault has occurred and the unit should be returned to the manufacturer or agent for service. [. . . ]