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702T User Guide and Technical Information
41
Note that most storage media now quote capacity in GB using SI units, where 1000 megabytes equals one
gigabyte.
PCM Audio
Uncompressed digital audio is expressed numerically by two measurements, bit depth and sampling
frequency, such as 16-bit/48 kHz. These two numbers are used to compute the data rate of uncom-
pressed audio.
Audio Data Rate = Bit Depth x Sampling Frequency
In the example below the data rate of a single 16-bit/48 kHz audio stream is computed in megabytes
per minute. Division by 1,048,576 converts from bits to megabits. Division by 8 converts from mega-
bits to megabytes; multiply by 60 converts seconds to minutes.
(((16 x 48000) / 1,048,576) / 8) x 60 = 5.49 MB/min
MP3 Compressed Record Time in Hours
MP3 Data Rate (bit depth/sampling rate), stereo track
64 kb/s
(0.47 MB/min)
96 kb/s
(0.70 MB/min)
128 kb/s
(0.94 MB/min)
160 kb/s
(1.17 MB/min)
192 kb/s
(1.40 MB/min)
256 kb/s
(1.86 MB/min)
320 kb/s
(2.34 MB/min)
Storage in GB
(1000 MB = 1 GB)
1 35 23 17 14 11 8 7
2 71 47 35 28 23 17 14
4 142 94 71 56 47 35 28
8 284 189 142 113 94 71 56
15 533 355 266 213 177 133 106
40 1422 948 711 568 474 355 284
60 2133 1422 1066 853 711 533 426
100 3555 2370 1777 1422 1185 888 711
The chart above shows file time available with the 702T with MP3 files. Time is expressed in hours at
the specified MP3 supported by the 702T. Note that all recordings are two-channel recordings.
Compressed Audio
When digital audio is compressed using some form of lossy, perceptual process such as MPEG2-
Layer3 (MP3 audio), Windows Media encoding (WMA), ATRAC encoding (used in MiniDisc), AAC
(MPEG-4 audio), or others - it can have a significant reduction in its data rate. Compressed audio has
enabled the practical distribution of audio over low speed data networks.
File Naming / Numbering
Files generated by the 702T are named using a syntax made up of four parts: scene number, take
number, mono track designator (if mono file is selected), and extension.
scene
number
take
number
extension
mono
file
designator
S001T01_1.WAV
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.
- firmware rev. 2.67 1
- Table of Contents 3
- Welcome 4
- 702T Firmware Known Issues 4
- Copyright Notice and Release 5
- Limitation of Liability 5
- Quick Start Guide 7
- Time Code Setup 8
- FireWire File Transfer 9
- Front Panel Descriptions 10
- Panel Button Lock 12
- LCD Display Descriptions 13
- Back Panel Descriptions 14
- 1 7 6 15
- Input Setup and Control 17
- -6 dBFS 18
- Input Delay 19
- Digital Input – AES3 19
- Input-to-Track Routing 20
- Selective Input Muting 21
- Sampling Rate and Bit Depth 22
- Word Clock 23
- C. Link – Multi-Unit Linking 24
- Outputs – Analog and Digital 25
- Headphone Output 26
- MS Stereo Monitoring 27
- Rotary Switch Behavior 27
- Headphone Favorite Selection 27
- Metering and Display 28
- Meter Ballistics 29
- Peak LEDs 29
- Tone Oscillator 30
- Time Code 31
- Frame Rate 32
- F Sampling Rate Modes 32
- Time Code Modes 33
- Time Code Hold Off 34
- Jam Menu 35
- User Bits 36
- Recording 37
- Pre-Record Buffer 38
- Failure During Recording 38
- Front Panel Lockout 38
- Record Pause 38
- Playback 39
- Audio File Formats 40
- Recording Time Calculation 42
- (1000 MB = 1 GB) 42
- S001T01_1.WAV 43
- Scene Name/Numbering 44
- Take Numbers 44
- Wave Agent Beta 45
- File Management 46
- File Finder Navigation 47
- File Viewer Screen 47
- File Time and Date 48
- File Size Maximum 48
- Setting/Clearing Flag Bits 49
- Automatic Flag Clearing 49
- File Deletion 50
- False Take Control 50
- Take Number Increments 51
- Take List 51
- Take Status 51
- CompactFlash Recording Media 52
- Formatting 53
- Speed Testing 53
- FireWire Bus Powering 55
- Qualified Drives 55
- DVD-RAM Drives 55
- File Transfer – FireWire 56
- Powering 57
- Time Code Clock Battery 58
- Power-up Messages 59
- Power Consumption Variables 59
- Firmware Upgrades 60
- Connecting the CL-1 61
- Keyboard Assignments 61
- Logic Inputs and Outputs 63
- Logic Inputs 64
- Logic Outputs 64
- Built-In Presets 64
- User Setup Data File 66
- • VU only 71
- • Peak only 71
- • Peak-hold only 71
- • Peak+VU 71
- • Peak-hold + VU 71
- Setup Menu Shortcuts 73
- Front Panel Button Shortcuts 74
- Connector Pin Assignments 75
- Specications 76
- Accessories 78
- CE Declaration of Conformity 80
- Software License 81
- Warranty & Service 82
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