19
spectively. If, for instance, track B is muted but tracks A, C, and D are still selected, the resulting fi les
will be named “_1, _3, and _4.” and track B will not be recorded, saving storage space.
When polyph B being a blank track. Blank tracks in polyphonic fi les take up the same amout of stor-
age space as tracks that are assigned.
Sampling Rate and Bit Depth
When recording to WAV (or BWF fi les) the 744T generates uncompressed, PCM audio fi les at the
user-selected sampling rate and bit depth. The 744T LCD calculates available recording time based
on the sampling rate, bit depth, number of tracks set for recording and the selected storage media
available capacity. See the
Calculating Recording Time
later in this guide to estimate record time.
Sampling Rate
When a sampling rate is selected for recording, all tracks are recorded at the selected sampling
rate. Sampling rates are selected among common rates from 32 kHz to 192 kHz. Additionally, non-
standard sampling rates can be applied when the 744T is word clocked from an external source
(clock sources between 32 kHz and 192 kHz). When recording off-speed sampling rates fi les will be
stamped with the rate closest to an internally generated frequency.
Sampling Frequency = Available Audio Bandwidth
The sampling frequency is expressed in samples per second (in hertz) and defi nes the number of
times in a second that the analog audio signal has been measured. Sampling frequency determines
the audio bandwidth, or frequency response, that can be represented by the digital signal. A quick
estimate of the maximum bandwidth capable of being represented at a given sampling rate is maxi-
mum analog frequency = sampling frequency/2. Higher sampling frequencies allow for wider audio
bandwidth.
The 744T generates the following sampling rates:
• 32 kHz
• 44.1 kHz
• 48 kHz
• 48.048 kHz
• 48.048F -fi le stamped at 48 kHz
• 88.2 kHz
• 96 kHz
• 96.096 kHz
• 96.096F - fi le stamped at 96 kHz
• 176.4 kHz
• 192 kHz
See Time Code section for more information about the 48.048F and 96.096F rates.
Bit Depths
The 744T records at bit depths of either 16 or 24 bit. 24 bit recording provides greater dynamic range
and addition headroom for signal peaks relative to 16 bit recordings. 24 bit recording (versus 16 bit)
is a signifi cant benefi t for fi eld production audio tracks.
Bit Depth = Available Dynamic Range
Bit depth defi nes the digital “word length” used to represent a given sample. Bit depth correlates
to the maximum dynamic range that can be represented by the digital signal. Larger bit depths
Summary of Contents for 774T
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