Ableton Live Intro Manual de Instruções descarregar pdf (Página 371)

CHAPTER 30. AUDIO FACT SHEET 369

In all cases, output is rendered and compared with the output of an unsplit version of the

same source. Phase cancellation testing of the two les conrms that they are identical.

30.3 Non-Neutral Operations

Procedures in Live that will cause a change in audio quality are referred to as non-neutral

operations. Users can be guaranteed that using these operations will cause at least some

change to the signal. Applying non-neutral operations to les imported into Live ensures

that the imported audio will differ from the les saved on disk. Applying non-neutral

operations to les being exported from Live ensures that what you hear during realtime

playback will be different from what will end up in your new le.

Non-neutral operations include:

30.3.1 Sample rate conversion/transposition

Sample rate conversion (during both real-time playback and rendering) is a non-neutral

operation. Playback of audio les at a sample rate that is different from the rate set in

Live's Preferences window will cause signal degradation. Transposition is also a form of

sample-rate conversion, and thus also results in non-neutral behavior.

To minimize potential negative results, it is recommended to do sample rate conversion as

an ofine process in another application. Once the samples have been converted to the

sample rate that you plan to use in Live, the les can be imported without any loss of quality.

Rendering audio from Live with a sampling rate other than the one that was used while

working on the project is also a non-neutral operation, and may result in a loss of sound

quality. It is recommended to always render using the original sampling rate, and then

convert the rendered le using a dedicated mastering application that is optimized for

these kinds of CPU-intensive, ofine tasks.

While we recommend that you use a high-quality ofine tool for sample rate conversion,

we recognize that one of Live's core features is its ability to pitch-shift and warp audio in

real time. For this situation, it is necessary to make a trade-off between CPU performance

and precision. We recommend the use of the Hi-Q button for any clips which undergo

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Ableton Live Intro Manual de Instruções Página 371