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. 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 . 26 Issue 1. 1 12 February 1996 © Prism Media Products Limited Page 2 of 28 Prism Media Products Limited Operation Manual Dream 8. 1. 28 Manual Revision History 6 September 1995 Version 1. 0 12 February 1996 Version First issue 1. 1 Hardware revision C Product Revision History February 1996 Hardware revision C Note that prior to revision C the DA-1 had a different output configuration from that described in this manual. [. . . ] 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. The SDIF-2 format is also limited to a maximum resolution of 20 bits for the audio data. 7. 1. 2. Balanced AES-3 XLR inputs: DI1, DI2, DI3 Input impedance: 110S. However if the data is encoded according to the consumer format of IEC958 [Ref. 4] it is also decoded correctly. Issue 1. 1 12 February 1996 © Prism Media Products Limited Page 15 of 28 Prism Media Products Limited Operation Manual Dream Pin 1 of the XLR connector is connected to the chassis via a capacitor and the signal is presented differentially across pins 2 and 3. Optical input: DI4 This input is physically compatible with the Toshiba `TosLink' fibre-optic connector, and data encoded according to professional (AES3-1992) or consumer (IEC958) formats is correctly decoded. This conforms to the coaxial specification of IEC958 and, for improved isolation, has transformer isolation with the screen capacitatively coupled to the chassis. Data encoded according to professional (AES3-1992) or consumer (IEC958) formats is correctly decoded. Dual-function coaxial (BNC) professional inputs: DI6, DI7 Input impedance: 75S. [. . . ] The result is the ratio of the total output rms signal level to the rms sum of the 2nd and 3rd order modulation products at 2kHz and 16kHz. Dynamic range or signal to noise ratio: 112dB CCIR-RMS 115dB (A weighted RMS) 112dB (unweighted RMS) Note: Measured at output settings of +18, +22 and +28dBu at a level of -60 dB FS. Idle channel noise: -112dB FS CCIR-RMS -115dB FS (A weighted RMS) -112dB FS (unweighted RMS) Note: Measured at output settings of +18, +22 and +28dBu Spurious levels: -105dB FS -130dB FS -144dB FS full scale signals signals below -20dB FS signals below -60dB FS Note: Highest level of any spurious frequency component Issue 1. 1 12 February 1996 © Prism Media Products Limited Page 25 of 28 Prism Media Products Limited Operation Manual Dream 7. 6. Power Mains voltage: Internally set for 90-120V (nominally 110V) or 195250V (nominally 230V) operation. 30W 7. 6. 1. 7. 6. 2. Consumption: 7. 7. Physical Dimensions 8. 8 lb (4 Kg) 19 inch (483mm) (rack-mountable) 1U (44mm) 10. 25 inches (260mm) Weight: Width: Height: Depth: 8. INTERNAL CONFIGURATION OPTIONS AND FUSES Other than the external mains fuse, the following parts can only be accessed by removing the equipment top cover. 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. [. . . ]