Applying The Uv22Hr Process; Outputs; Aes/Ebu; Usb Audio - Apogee Mini-Me Owner's Manual

2-channel portable 44.1/48/88.2/96 khz sampling 24-bit a/d converter with mic/instrument preamp

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Datasheet (2 pages)

Setup manual (1 page)

Table Of Contents

Table of Contents

UV22HR Encoding is best applied as the final step in the signal chain before the actual mastering device.

Using the Mini•Me as the A/D converter to capture an analog mix to digital for Compact Disc, for example, you

would set the word length to 16 bits.

Notes

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Because UV22HR is essentially a "once only" process, we do not recommend that you use it more than once

on a signal. Multiple passes through the UV22HR process could degrade the noise floor of the system at

the upper frequencies and produce artifacts.

•

Recordings to be used in a sample or sound effects disc can be UV22HR encoded if pitch shifting is not like-

ly to be employed, or if pitch shifting upward only is to be used. Pitch shifting downward on processed sig-

nals risks making the normally ultrasonic UV22HR energy concentration audible.

•

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). In addition, UV22HR

is a very useful technique when used in conjunction with Internet audio delivery systems such as 'MP3'

(MPEG1 Layer III), Real Audio, QuickTime and other systems, where the ability of UV22HR to maintain high-

resolution quality and detail at the 16-bit level means smaller, better-sounding files and streaming audio sig-

nals, offering more effective use of available bandwidth.

•

As maximizing word length is generally regarded as more important than increasing sample rate, there is

little if any need to provide word-length reduction from 24 bits at sample rates above 48 kHz: in virtually all

cases, where high sample rates are available, so is 24-bit operation. For this reason, we do not provide

UV22HR operation at high sample rates. This policy may be revised if there is sufficient demand.

Digital Outputs

AES/EBU: The industry standard AES/EBU (Audio Engineering Society/European Broadcast Union) format. Two

channels of audio data as well as sync information are carried in the same cable. Simply connect the AES out-

put of the Mini•Me to the AES input of the receiving device. Set the receiving device to 'digital in'. If the receiv-

ing device does not automatically switch its sync source to digital in, manually select the AES input as its source.

The AES output is capable of what is commonly referred to as "single-wire" operation at higher sample

rates. That is, at 88.2 and 96 kHz, the single AES output on the rear panel of the Mini•Me will output both left

and right channels. This differs from the older AES format for high speeds, which is referred to as "double-wire"

or "double-wide". These "double-X" formats required two AES connectors for 88.2K and 96K transfer, essen-

tially using one connector for each channel, and are now generally obsolete.

S/PDIF: S/PDIF (Sony/Philips Digital Interface Format) is a popular digital interface format found on virtually all

DAT recorders and many pro and semi-pro pieces of equipment. Like AES/EBU, two channels of audio data as

well as sync information are carried in the same cable. Simply connect the S/PDIF output of the Mini•Me to the

S/PDIF input of the receiving device. Set the receiving device to 'digital in'. If the receiving device does not

automatically switch its sync source to digital in, manually select the S/PDIF input as its source.

The S/PDIF output is also capable of single-wire operation at higher sample rates.

USB Audio: The Mini•Me offers USB Audio digital output for use with computer operating systems that sup-

port USB Audio devices. The audio can be handled in the operating system in different ways. Refer to your plat-

form and OS on page X? for detailed information on setup options for the Mini•Me. Remember, even if you get

the sample rates mismatched between the Mini•Me and your computer, the unit will convert sample rates auto-

matically. And if you select, for example, 24-bit on the unit and 16-bit on the computer, UV22HR will automati-

cally be applied to the signal sent to the USB port (44.1/48 kHz sampling only).

Once you've followed the setup procedure on page X? for the Mini•Me to receive USB Audio from the com-

puter, you're computer will be set up to receive USB Audio from the Mini•Me.

Mini•Me User's Guide