Data Format TAFFmat

The recorded data file format for the TEAC data recorders adopts TAFFmat (TEAC Data Acquisition File Format). This is a file format that allows recorded data files to be read directly from PC applications.

Type of files

WX-7000 / LX-1000 / VR-24 / es8 makes a binary-format data file and ASCII-format header file each time recording stops or pauses.

*Files are created when recorded.

File type	Format
Data file	Contains data converted from analog to digital, etc. (binary format with "dat" file extension)
Header file	Contains recording conditions and other information Text (ASCII) format with "hdr" file extension
Voice memo file*	Contains voice memo data WAV format with "wav" file extension
GPS file*	Contains GPS data "gps" file extension
Index file	Contains recording conditions and other information Text (ASCII) format with "hdx" file extension

File name

The file name is common to the data file and header file. An ID number is added to the end of the specified file name. When you specify a new file name, the ID number starts from 1. After recording is stopped or paused, the ID number is automatically incremented each time the recording restarts. If a data file with the same name or same ID number already exists when recording, the next ID number is used.
Set the file name on the LXK Navi File Settings Screen or the RECORDING FILE Settings Screen of the remote control unit (optional). For the file name, use up to 29 half-width alphanumeric characters. ID numbers (starting from 001) with the set number of digits are attached to file names.
When recording to an SD card, the number of digits is fixed to 3, and the maximum number of characters is 32. When recording to a computer, the number of digits can be set from 3 to 5, and the maximum number of characters is 32–34.

• If the ID number exceeds the set number of digits, recording will stop.

Media folder structures (e.g.LX-1000)

*Files are created when recorded.

Folder type	Name	Details
Master folder	LXDAT	This is created in the root folder. Data is managed inside it. The name is fixed.
Project folders	Characters as set (Example:LX1000-DIR1)	These are created in the master folder. Their names can be set as desired.
Recording folders	Characters as set (Example:LX1000_)	These are created in project folders. Their names can be set as desired. Each time recording starts, a recording folder is created with a 3-digit suffix added automatically.
Recording data	Same as recording folder	When a recording is divided at 4 GB, a -followed by a three-digit suffix will be added to the name

Folder structure example

Data file

16-bit data converted from analog to digital is recorded as 2-byte integer values from -32768 to +32767 while 24-bit converted data is recorded as 4-byte integer values from -8388608 to +8388607. Negative numbers are shown using two's-complement notation.
The byte order is from the lowest to the highest (Intel format).The data order is from the first sampling channel to the second sampling channel and so on until the last sampling channel. This order is called the INTERLACED format, and the format name is recorded in STORAGE_MODE in the header file.
The structure of a data file is as follows. In this document, a collection of data as shown in the example is called a "scan". A data file is made of repeated scans.

Example of data for one scan recorded at 6kHz sampling frequency

Converting data to physical quantities

16-bit data converted from analog to digital is recorded as integer values from -32768 to +32767 and the value wouldbe ±25000 when the input is ±100% in the input range settings. 24-bit converted data is recorded as integer valuesfrom -8388608 to +8388607 and the value would be ±6400000 when the input is ±100% in the input range settings.
The input value is obtained from the following formula:
Input value = (A/D conversion value of the data file) × SLOPE + Y_OFFSET

• See "Explanations of header file" on page 8 for information about SLOPE and Y_OFFSET.

Header file

Header files are ASCII-format text files containing information such as recording conditions.In a header file, each recording-condition entry is written on 1 line, with parameters separated by a comma (,). An example of a header file is shown as follows.

Example of header file

Explanations of header file

DATASET	File name
VERSION	1 (This is a fixed value.)
SERIES	Name of each channel
DATE	Date when recording started (month-day-year)
TIME	Time when recording started (hour: minute: second)
RATE	Sampling frequency (Unit: Hz)
VERT_UNITS	Physical units of each channel
HORZ_UNITS	Time axis units (Sec: This is a fixed value)
COMMENT	Comment input on the file settings screen
NUM_SERIES	Number of recording channels
STORAGE_MODE	Data order. Fixed as INTERLACED because this is the scan order.
FILE_TYPE	In 16 bits A/D, INTEGER (1data, 2-byte integers) In 24 bits A/D, LONG (1data, 4-byte integers)
SLOPE	Coefficient used when converting data to physical units
X_OFFSET	Location of the first data on the time axis; normally 0 The setting value (number of seconds to three decimal places) is written in minus for the pre-trigger time. Even if you set the number of scans for Pre-trigger, this will be in seconds.
Y_OFFSET	Offset used for converting data to physical units
NUM_SAMPS	Number of data items recorded per channel
DATA	The data that follows this entry is specific to this model, and it might differ from the formats of other models.
DEVICE	LX-1000
SLOTn	Amplifier name and number of channels installed in SLOT n
CH1_	The following information is written after the underscore: channel names and amplifier settings (input range, coupling, sensor current, weighting filter, HPF setting) for PA amplifiers, and output ranges and output channel settings for AO amplifiers
REC_MODE	Recording destination device (SD, PC, SD+PC)
END_TIME	Recording end time
START_TRIGGER	Recording start conditions COMMAND: Command DATE: Start time setting EXT: External trigger TIME_OUT: Timeout SYNC: Synchronized recording PRE: Added for a pre-trigger
STOP_CONDITION	Recording stop conditions COMMAND: Command LEVEL: Level trigger TIMER: Specified recording time EXT: External trigger MEDIA FULL: When media becomes full SYNC: Synchronized recording POST: Added for a post-trigger
START_PRE_COUNT	Number of scans recorded by a pre-trigger
STOP_POST_COUNT	Number of scans recorded by a post-trigger
MARK	Number of scans at the instant an event mark was attached.
VOICE_MEMO	The bits per sample and data size (bytes) for voice memos
LX-1000_VERSION	LX-1000 main firmware and FPGA versions and amplifier unit firmware and FPGA versions
DIVIDE	File division number (added when files are divided at 4GB intervals)
SYNC	Synchronized recording setting