Record Time; Pcm Audio; Audio Data Rate = Bit Depth X Sampling Frequency; Appendix B - Metadata Implementation - Sound Devices 788T User Manual And Technical Information

788T/788T-SSD User Guide and Technical Information
track hours fi gure by two. Similarly for eight-track recording, divide track-hours by eight. Note that
the 788T supports additional sampling rate / bit depth combinations, however, only the most com-
mon are included below.

Record Time

The chart shows that when recording 24-bit/48 kHz audio to a 160 GB drive, the maximum duration
of available recording time is roughly 323 track-hours. If recording a stereo two-track fi le, this yields
161 stereo hours of record time.
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
Appendix B – Metadata Implementation
788T Broadcast wave fi les include iXML (revision 1.5) data and bEXT chunk data. For bEXT and
iXML-aware software applications this data is available. For applications that don't recognize bEXT
or iXML, this information is ignored. The chart below details the supported metadata parameters.
• iXML: Metadata stored in the Broadcast Wave iXML chunk
• bEXT: Metadata stored in the Broadcast Wave bEXT chunk
• FMT: Metadata stored in the Broadcast Wave Format chunk
= supported; blank = not supported
Metadata
General Information
Project
Roll (Tape)
Scene
Take
Notes
Circle Take
File UID
File Sample Rate
Digitizer Sample Rate
Bit Depth
142
v. 2.10 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Type
U = Entered by User
M = Automatically Entered by the Machine
iXML U; via Folder Options menu Top-Level
iXML, bEXT M; uses creation date or is overridden by User
U; via Folder Options menu Mid-Level
iXML, bEXT U; via Scene Name menu
iXML, bEXT M or
U; via Take Name menu
iXML, bEXT U; via HDD menu
iXML U; via Take List menu
iXML M; Unique File Identifier
iXML, FMT U; via the Sample Rate menu
iXML U; Actual sample rate of AD converter
iXML, FMT U; via Bit Depth menu
Notes Read Write