Rosetta AD 24-bit 2-channel A/D Converter 44.1/48 kHz version & 44.1/48/88.2/96 kHz version Owner’s Manual and UV22HR® License Agreement v3.0 – May 2000 Firmware revision 3.0.0 – inc.
Rosetta AD User’s Guide Operational instructions written by Joe Raia. “Introduction to Digital Audio” by Julio Alvarez and Richard Elen. Production, editing and word-wrangling by Richard Elen. SoftLimit and UV22 are Registered Trademarks of Apogee Electronics Corporation. All other trademarks are property of their respective holders. Technology within the Rosetta AD may be covered by one or more patents that are the property of Apogee Electronics Corporation.
Rosetta AD User’s Guide Rosetta AD 24-bit 2-channel A/D Converter 44.1/48 kHz version & 44.1/48/88.2/96 kHz version Owner’s Manual and UV22HR® License Agreement v3.0 – May 2000 Firmware revision 3.0.0 – inc.
Rosetta AD User’s Guide Warnings CAUTION: To reduce the risk of electrical shock, do not remove the cover. No user serviceable parts inside; refer servicing to qualified personnel. To change the operating voltage or change the firmware EPROM, it is necessary to remove the cover of the unit. As a result, such operations must be carried out only by technicallyqualified personnel. WARNING: To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture.
Rosetta AD User’s Guide Registration and Warranty Information Be sure to register your Rosetta AD, either by filling in the enclosed Registration Card or by completing the on-line registration form at our Web site: http://www.apogeedigital.com/register.html. If you do so, Apogee can contact you with any update information. As enhancements and upgrades are developed, you will be contacted at the registration address. Firmware updates are free for the first year of ownership unless otherwise stated.
Rosetta AD User’s Guide Declarations of Conformity Declaration of Conformity—FCC Apogee Rosetta AD This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits of a Class B digital device, pursuant to Part 15 of the FCC Rules.
Rosetta AD User’s Guide Licensing and Legal Information Carefully read the following legal agreement prior to using the UV22HR process provided in the Rosetta AD. Use of UV22HR constitutes your acceptance of these terms. If you do not agree to the terms of the agreement, promptly return the Rosetta AD and the accompanying items, including written materials and containers to the location where you obtained them for a full refund. 1.
Rosetta AD User’s Guide User’s Installation Notes Space left blank for user tracking of factory modifications, option installations, software upgrades, manual revisions/ addenda, internal settings. About This Manual This manual was written to help you to use this product to its fullest potential. Although the Rosetta AD is inherently simple to operate, it may contain features that may not be obvious from the front panel.
Rosetta AD User’s Guide Table of Contents Warnings ...........................................................................................................................4 Registration & Warranty Information ...............................................................................5 Service Information...........................................................................................................5 Declarations of Conformity................................................................
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Rosetta AD User’s Guide Quick Start Guide Congratulations! You have just purchased one of the finest analog-to-digital converters available. Please take a few minutes to fill out and return the warranty registration card. In order to get technical support and warranty repairs, you must return your warranty registration card, or register your unit on-line at http://www.apogeedigital.com/. It won’t take you long, it will cost you the price of a stamp or less, and you’ll be happy you did later on.
Rosetta AD User’s Guide The Front Panel See also the fold-out front and rear panel diagrams at the end of this manual. POWER BUTTON Press for power on. Press again for power off. SAMPLE RATE Selects the sample rate (sampling frequency) for the digital outputs and word clock output to either 44.1 kHz or 48 kHz (the upper two LEDs are unused). The Rosetta 96 also includes 88.2 kHz and 96 kHz selections and uses the upper two LEDs. Tips • • • • Select 44.1 kHz to record to Compact Disc (CD-R).
Rosetta AD User’s Guide If you need to record on to a 16-bit or 20-bit device without UV22HR, select ‘24-bit’. The recording device will truncate (i.e., not use) the least significant bits (LSBs). See the section on UV22HR for more information. If the recorded audio is going to be de-tuned (pitched-down) by more than a major third, data-compressed by a ‘lossy’ compression system or ‘normalized’, be aware of (and listen carefully for) artifacts that can occur as a result of mixing these processes.
Rosetta AD User’s Guide The digital scale (‘dBFS’ or ‘decibel full-scale’) differs significantly from the conventional analog scale. The difference is that these ‘zeros’ are not the same kind of thing. The maximum level on a digital meter is 0dBFS, (a digital “word” of all ones), which is a real, absolute limit, whereas analog signals can go well over ‘0 dB’ on a VU meter without a problem.
Rosetta AD User’s Guide The Rear Panel AD INPUT Left and Right Analog inputs. The Rosetta is configured from the factory for pin 2 hot operation. To change to pin 3 hot, set DIP switch #2 to the ON position. Note: The Rosetta does not contain microphone preamplifiers, so a microphone cannot be connected directly to the AD inputs. Also, to accommodate the very high impedance outputs of guitars/basses, use a suitable preamplifier (or a “direct box”) in between the Rosetta and your guitar/bass.
Rosetta AD User’s Guide When configured for ‘double-wire’ 88.2/96 kHz operation (see page 12 for more information) and 88.2 or 96 kHz is selected as the sampling frequency, the Rosetta 96 outputs the left channel on AES output 1 and the right channel on AES output 2. In this case, please be sure that the device being fed an 88.2 or 96 kHz signal from the Rosetta uses the double-wire method.
Rosetta AD User’s Guide The reason to have a selectable threshold for ‘over’ indication relates to the particular application at hand. For example, when recording percussive instruments with sharp transients, some engineers don’t mind having the transients go ‘over’ for a few consecutive samples. In fact, some engineers record that way on purpose! In this case, set the over threshold to, say, 3 or 4 samples.
Rosetta AD User’s Guide Internal Adjustments The following information is provided for authorized technicians only and is not intended for use by the user. Adjustment of internal settings by non-authorized personnel will void the warranty. Technicians are expected to follow appropriate ESD practices. The Voltage selector This is located inside the Rosetta, adjacent to the AC connector. The two settings are as follows: “115VAC” accepts 95 to 145 V ac (USA and Japan).
Rosetta AD User’s Guide Example: You wish to align your Rosetta such that a +4dBu / 0VU input equals a digital level of –16dBFS. Reading the 12-segment bar graphs in Cal Mode tells us that –16dBFS equals the sixth bar from the left. Adjust the ‘Level Trim’ pots. As soon as the sixth bar illuminates, turn slowly until the ‘OVER’ LED illuminates. You are now calibrated to –16dBFS ±0.1 dB. If the ‘OVER’ LED came on and then went off, you have passed the ±0.
Rosetta AD User’s Guide You can use UV22HR in conjunction with a wide range of both lossy and lossless compression technologies used in DVD mastering, such as Dolby AC-3, DTS, and MLP (Meridian Lossless Packing).
Rosetta AD User’s Guide Rosetta AD Specifications Analog and A/D Converter Parameter Resolution Sample Rate Input Impedance Pro Consumer Relative THD+N –0.1 dBFS –20 dBFS –60 dBFS 44.1–48, 88.2–96 kHz Value 24 ±10% 9K 15K Ω Ω –110 –112 –91 –93 –56 –58 dB dB dB dB dB dB Dynamic range –60 dB, Unweighted 116 –60 dB, A-weighted 119 Peak Spurious Component –126 Group Delay (in passband) 34/Fs Passband Ripple ±0.001 Digital Filter Stopband 0.
Rosetta AD User’s Guide The Apogee Rosetta AD – Front & NOTE: These illustrations provide an overview of the controls and Power Switch – Press on, press off. There is no power-on LED as other indicators will illuminate when the unit is switched on. Sample Rate Selector – Each time you push the button, the system will switch to the next available sample rate, as indicated by the LEDs. 88.2 and 96 only available on the Rosetta 96 model.
Rosetta AD User’s Guide Rear Panels, Controls & Connectors connectors only. Refer to the manual for full operating instructions. Soft Limit – Allows you to get maximum level on tape or disc without “overs”. Acts like a subtle, inaudible compressor. Press and hold this button for 2 seconds to enter or leave CAL Mode. The LED flashes slowly in this mode and the meters indicate 1 dB per LED. LED Bargraph Meters – Indicate the digital level from the A/D converter. Read from –50 to 0 dBFS, except in CAL mode.
