User manual APOGEE ROSETTA 200

[. . . ] 2-channel 24 bit, 192 kHz, AD/DA Converter User's Guide v1. 0 - October 2004 2-channel 24 bit, 192 kHz, AD/DA Converter v1. 0 - October 2004 User's Guide ROSETTA 200 ­ User's Guide APOGEE ELECTRONICS Warnings & Copyrights FCC warning This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to take whatever measures necessary to correct the interference at his own expense. Copyright Notice The Apogee ROSETTA 200 is a computer-based device, and as such contains and uses software in ROMs. [. . . ] OPTION ­ clock is derived from the connected option card input (e. g. AES + DW ­ clock is derived from the AES 1 In connector; the input signal is assumed to be Double wide format, thus the resultant sample rate will be in the 88. 2-192kHz range. WC ­ clock is derived from the Word Clock In connector. 3) 4) 5) 4 ROSETTA 200 ­ User's Guide APOGEE ELECTRONICS Navigating the Front Panel 7 continued 12 6 8 9 10 11 13 6) WC I/O (Word Clock I/O Ratio) ­ This parameter determines the ratio between the Word Clock Input/Output frequency and the unit's sample rate. ·To set the ratio between a Word Clock Input and the unit sample rate (when locked to WC): 1 Connect a word clock signal to the Word Clock In, set SAMPLE RATE to EXT, and set SYNC to WC. 2 While holding down the SYNC button, press the SAMPLE RATE button to toggle to the desired sample rate range. · To set the ratio between the Word Clock Output frequency and the unit's sample rate (when locked to all other internal or external clock sources). 2 While holding down the SYNC button, press the SAMPLE RATE button to toggle to the desired word clock output frequency range. LOCK ­ These LEDs indicate the Lock status of the Rosetta 200's clock. When both Wide and Narrow are lit, the Rosetta 200 has locked to the selected CLOCK SOURCE in such a way as to ensure the highest quality conversion. If only the Wide LED lights, the stability of the clock source is questionable, and the source should be verified. SOURCE (to Digital Outputs) ­ This parameter selects the input source that is routed to ALL digital outputs. To employ the Rosetta 200's A/D converters, set this parameter to Analog. SRC (Sample Rate Conversion) ­ When a digital source has been selected, press and hold SOURCE (to Digital Outputs) to engage SRC. Please see AUTO SRC (below) for more detailed information. . 7) 8) 9) 10) CLEAR - This button clears the meter's OUCH (OVER) LEDs 11) SOFT LIMIT ­ Press and hold CLEAR to engage SOFT LIMIT on both analog inputs. Soft Limit is an analog process that rounds transient peaks ­4 dBFs and above with attack and release times that may be considered instantaneous. As with any peak reduction device working at such fast time constants, Soft Limit is most effective with signals whose peak information is greater than its average (or RMS) information, such as drums, plucked instruments and dynamic mixes. Soft Limit may not be the appropriate choice for limiting signals whose crest factor (peak to RMS ratio) is low, such as bass or organ. 12) CODA ­ The CODA Audio Finishing Module is comprised of three processes : SRC (Sample Rate Conversion), UV22HR and APTOMIZER. 13) PROCESS ­ This parameter toggles AUTO SRC on and off and sets digital output resolution to 24 or 16bit/UV22HR AUTO SRC (Sample Rate Conversion) ­ When AUTO SRC is engaged, sample rate conversion is automatically applied to digital inputs when needed. If a selected digital input is detected to be nonsynchronous with the unit's clock, sample rate conversion is automatically applied to the input and the corresponding SRC LED lights. 24-BIT/16-BIT/UV22HR ­ When the unit sample rate is set to a range of 44. 1-48k, the bit resolution of all digital outputs may be set to either 24-Bit or 16-Bit/UV22HR. When 16-Bit/UV22HR is selected, Apogee's proprietary dither signal, UV22HR, is employed to encode 24-bit resolution in a 16-bit signal. [. . . ] WORD CLOCK IN ­ This BNC connector accepts a TTL Logic clock signal. 4) WORD CLOCK IN, Termination Switch Terminated switch position Unterminated switch position Figure 3 5) 6) 7) 8) 9) WC IN TERMINATION ­ This pushbutton switch determines the termination status of the Word Clock In, as depicted in Figure 1. WORD CLOCK OUT ­ This BNC connector provides a TTL Logic clock signal output. OPTICAL IN ­ This Toslink connector accepts ADAT, S/MUX and S/PDIF format optical inputs. OPTICAL OUT - This Toslink connector provides ADAT, S/MUX and S/PDIF format optical outputs. 10) OPTION SLOT ­ This slot accepts X-DigiMix, X-HD and X-FireWire Option cards, which provide additional digital I/O formats. [. . . ]