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8
Getting In Deeper: Recording
46
Base Sample Rates: 44.1/88.2/
176.4kHz versus 48/96/192kHz
There are two “base” sampling rate standards in the world of
professional audio—44,100 samples per second (44.1kHz) and
48,000 samples per second (48kHz). Broadly speaking, audio CD’s
operate at 44.1kHz, while film and television operate at 48kHz.
High definition sample rates—including 88.2kHz, 96kHz,
176.4kHz, and 192kHz—are all simply multiples (doublings and
quadruplings) of the 44.1kHz and 48kHz standards. The IO14/26
offers all of these sample rates.
If you’re unclear on what base sample rate to use, consider this
guideline:
If your recordings are slated for release on CD, MP3,
Casette, Vinyl, etc. set your sampling rate to 44.1, 88.2,
or 176.4k for best results.
If your project is slated for DVD, film, or television, set
your sampling rate to 48, 96, or 192k for best results.
If you’re working on a commercial project and you’re not sure
what rate to use, ask your technical supervisor before you begin
working.
High Resolution Recording
The Upside of High Definition recording
Recording at high definitions (i.e., anything at 88.2k or above)
means youre capturing sound at well beyond the range of human
hearing. Doing so has three sonic advantages:
1. At the Hardware Level: All analog-to-digital converters
need to heavily filter your signal’s highest frequencies to
prevent a nasty form of distortion called “aliasing” from
taking place. Only sounds above the sampling limit are
removed, but the filter itself causes unwanted phase-shifts
that some critical listeners can hear (mind you… these are
quite subtle changes in your audio)
When you’re recording in HD, the anti-aliasing filter is much
more gradual and set at a very high frequency (well over the
upper limit of human hearing). This all but eliminates any of
the phase distortion that you may have heard.
2. At the Software Level: Since software plugins such as
equalizers and compressors have more sample data to work
with, carefully programmed plugins can sound better.
Changing base sample rates
mid-stream in projects is
fairly straightforward in most
DAW programs. However,
doing so may cause very
slight but still audible
degradation of your audio.
48


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