Instruction manual

About TAFFmat
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About TAFFmat
TAFFmat (an acronym for Teac Data Acquisition File Format) is a file format composed of the following: (1)
A data file containing A/D (analog to digital) converted data that is in binary format with the extension dat.
(2) A header file containing information, such as recording conditions, that is in text format with the
extension hdr.
This document uses the term ID to refer to a collection of data collected from the start of recording on the LX
series until the recording is stopped or paused. For each ID, one data file and one header file is recorded. A
voice memo is recorded as a WAV file with the extension wav.
The above files share a common file name, to which is appended an ID number. When a new file name is
specified, this ID number becomes 1. Each time recording starts, this number advances by 1.
A/D-converted data is recorded as 2-byte integers between -32768 and +32767 in the case of 16 bits A/D
and also recorded as 4-byte integers between –8388608 and +8388607 in the case of 24 bits A/D. Negative
numbers are expressed as complements of 2. The byte order is from the lower bytes to the higher bytes. The
sequence of data is as follows: first sampling channel order, second sampling channel order, ....., last
sampling channel order.
In LX-100 series, ±100% of the input range is equivalent to ±25000 of 16 bits A/D or ±6400000 of 24
bits A/D
This document uses the term “scan” to refer to a collection of data resulting from one sampling. A data file
consists of scan repetitions.
Example: The data of 1 scan when the sampling frequency is 6 kHz:
Standby
REC
Start
FWD
Pause
PAUSE
Resume
FWD
Stop
STOP
Aaaaa001.dat
Aaaaa001.hdr
Aaaaa002.dat
Aaaaa002.hdr
ch 1
ch
2
ch
3
ch
4
ch
5
ch
6
ch
7
ch
8
Data sequence
1/6000 sec