Recording Time Calculation; Uncompressed Recording Time In Track-Hours - Sound Devices 702 User Manual

702 User Guide and Technical Information
Post-record metadata editing can also be performed using a Mac OS or Windows based computer with
Sound Devices Wave Agent Beta.

Recording Time Calculation

The calculation of available 702 recording time involves three factors:
• track count - how many concurrent audio tracks are selected for recording.
• data rate - calculated from the sampling 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 capacity - typically expressed in GB

Uncompressed Recording Time in Track-Hours

The chart above shows recording time available with the 702. Time is expressed in hours per track
(track-hours) at the specifi ed data rate supported by the 702. If recording two tracks, divide the track
hours fi gure by two. Similarly for four-track recording, divide track-hours by four. Note that the 702
supports additional sampling 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 80 track-hours. If recording a stereo two-track fi le, this
yields 40 stereo hours of record time.
Note that most storage media now quote capacity in GB using SI units, where 1000 megabytes equals one
gigabyte.
34
v. 2.67 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
See Wave Agent Beta for more details.
Data Rate (bit depth/sampling rate), one track
16/44.1 16/48
(5.05 MB/min) (5.49 MB/min)
1 3.30
2 6.60
4 13.2
8 26.4
15 49.5
40 132
60 198
100 330
24/48
(8.24 MB/min)
3.03 2.02
6.07 4.05
12.1 8.09
24.3 16.2
45.5 30.3
121 80.9
182 121
303 202
24/96 24/192
(16.5 MB/min) (33.0 MB/min)
1.01 0.51
2.02 1.01
4.05 2.02
8.09 4.05
15.2 7.59
40.5 20.2
60.7 30.3
101 50.6