User manual

Audio Generator
4-26
AM700 Audio Measurement Set User Manual
User Bits. Touching this soft key displays a menu from which you can select the type
of user data produced by the audio generator. Selections are Null (logic 0, the
default) or File. No firm standards currently exist that describe uses for the
information in user bits. Refer to AES3-1992 (ANSI S4.40-1992) for more
information about the user data format.
You can also select a file (created on a PC, saved to a floppy disk, and transferred to
the AM700) from which the audio generator reads user information. Refer to AM700
Storage Manager on page 4-132 for information on file transfers.
The following file is an example that emulates the channel status from a CD player:
am700 cstatus 1.0
0 10000000 0x00
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
There are two parts to this file: a header and the data. All channel status or user-bit
files consist of a header followed by data.
Header. The header is a line of text that identifies the type of file and the version of
the file structure. The syntax is:
am700 <type> <version>
The <type> is cstatus for channel status files, or userbit for user bit
files. For now, there is only one valid <version>, and that is 1.0. All columns should
be separated by a blank space and the header must be on one line. When a filename
is chosen either from the user interface or remotely using SCPI commands, the
AM700 opens the file and makes sure the header is present and valid.
Creating a
User Bits or
Channel
Status File