Recording time calculation, Uncompressed recording time in track-hours – Sound Devices 722 User Manual
Page 36
722 User Guide and Technical Information
34
v. 2.67
Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Using an external keyboard via the CL-1 Remote Control and Keyboard Interface the entry of notes
is much quicker than using the Rotary Switch.
Post-record metadata editing can be performed using a Mac OS or Windows based computer with Sound
Devices Wave Agent Beta.
See Wave Agent Beta for more details.
Recording Time Calculation
The calculation of available 722 recording time involves three factors:
• track count - how many concurrent audio tracks are selected for recording.
• data rate - calculated from the sample rate and bit depth for non-compressed audio and by bit
rate for data compressed audio. Data rate determines how big the data “container” is for the
audio signal (see the calculation below for determining PCM audio).
• storage medium capacity - typically expressed in GB
Uncompressed Recording Time in Track-Hours
Data Rate (bit depth/sampling rate), one track
16/44.1
(5.05 MB/min)
16/48
(5.49 MB/min)
24/48
(8.24 MB/min)
24/96
(16.5 MB/min)
24/192
(33.0 MB/min)
Stora
g
e in GB
(1000 MB = 1 GB)
1
3.3
3.1
2:
1
0.5
2
6.7
6.2
4.1
2
1
4
13.5
12.4
8:2
4.1
2
8
27
24.8
16.5
8.2
4.1
16
54
49.7
33.1
16.5
8.2
40
135.1
124.3
82.8
41.4
20.7
60
202.7
186.5
124.2
62.1
31
80
270.3
248.7
165.7
82.8
41.4
100
338
310.8
207.1
103.5
51.7
160
540.7
497.38
331.38
165.4
82.8
The chart above shows recording time available with the 722. Time is expressed in hours per track
(track-hours) at the specified data rate supported by the 722. If recording two tracks, divide the track
hours figure by two. Note that the 722 supports additional sample rate/bit depth combinations,
however, only the most common are included below.
Record Time
The chart shows that when recording 24-bit/48 kHz audio to a 40 GB hard drive the maximum
amount of recording time available roughly 330 track-hours. If recording a stereo two-track file, this
yields 115 stereo hours of record time.
Note that most storage mediums now quote capacity in GB using SI units, where 1000 megabytes equals
one gigabyte.