Bedienungsanleitung Adobe Handleiding Adobe Audition 3.0 (Seite 253 von 294) (Englisch)

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ADOBE AUDITION 3.0

User Guide

248

Avoidcompressingthesameaudiotomp3morethanonce.Openingandresavingan.mp3filecausesittoberecom-

pressed, so any artifacts from the compressing process become more pronounced.

MP3/mp3PRO Encoder Options dialog box contains two sets of options: simple options for choosing an encoding

method and more advanced options. To view the advanced options, click Advanced. To view only the basic options,

click Simple.

Simple mp3 options

CBR (Constant Bitrate) Encodes the same bit rate throughout the entire file. This method is the most common and

the most predictable for bandwidth and file size.

VBR (Variable Bitrate) Encodes higher bit rates for more complex material and lower bit rates for simpler material.

While it depends on the source material, VBR-encoded .mp3 files generally tend to be smaller than CBR-encoded

.mp3 files. Use the menu below the VBR option to choose a quality level from 10 (lowest quality but smaller file) to

100 (highest quality but larger file). Some mp3 players don’t support VBR-encoded files. For maximum compati-

bility, select CBR.

MP3 Encodes the file to mp3, but without the PRO data.

mp3PRO Encodes the file with PRO data that helps re-create high frequencies in the compressed file, especially at

low bit rates. An mp3PRO file can still be played back by an mp3 player that doesn’t support the PRO data, but the

quality may be lower than for a standard mp3 file of that bit rate. For example, a 64 Kbps mp3PRO file sounds more

like a 112 Kbps or 128 Kbps mp3 file if the player supports mp3PRO, but it sounds like a 64 Kbps mp3 file (or worse)

if the player doesn’t support mp3PRO.

Advanced mp3 options

Maximum Bandwidth (Available only if MP3 is selected) Specifies the highest frequency that will be encoded. Lower

bandwidths help eliminate tinkly and phase-like effects but at the expense of reducing the higher frequencies.

CBR Bitrate (Available only if CBR and MP3 are selected) Specifies the bit rate for CBR encoding. The higher the

number, the larger the file, but the better the quality. Valid values range from 20 Kbps to 320 Kbps.

Sample Rate (Available only if CBR and MP3 are selected) Specifies the sample rate of the destination file. (The

decoder will also use this rate.) Keep in mind that not all sample rates are valid for a particular bit rate.

VBR Quality (Available only if VBR is selected) Specifies the quality for VBR encoding. The higher the number, the

larger the file, but the better the quality. Valid values range from 1 to 100.

Low Complexity Stereo (Available only if CBR and mp3PRO are selected) Encodes the audio as mono, with infor-

mation on how to reconstruct the stereo signal at playback. A non-PRO decoder plays back only mono, but a PRO

decoder plays back stereo. The stereo image is different from the original audio, but it most often sounds better than

its mono counterpart.

Codec Provides three codec options. Depending on the type of audio, one codec might do a better job than the

others. Experiment to see which one is best for your project. Current-Best Quality is an extremely fast algorithm,

and it generally does a very good job at lower bit rates, as well as giving more high-frequency detail without

unwanted artifacts. Unless you have a specific reason not to, use this setting. Legacy-Medium Quality (Fast) uses a

different model for encoding and can be more complete at bit rates above 160 Kbps. Legacy-High Quality (Slow)

takes longer to encode, but the quality is higher than that of the Medium Quality option.

Allow Mid-Side Joint Stereo Combines the left and right channels by using a Mid-Side method when encoding

middle quality bit rates and below. This option preserves surround-sound information by saving the common audio

in one channel while the difference between the channels is saved in the other.

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