Before you begin importing or exporting voice segments, read the following
information for an explanation of the attributes that you will define for
the audio data:
- The data format, sampling rate (the rate at which audio data is examined),
and sample width (the number of bits in each sample) of the audio data are
determined by the format of the data to be imported or the required format
of exported data. Default format settings are defined in the system parameters.
The Format Control window initially displays the system default settings.
Valid settings are:
- Valid data formats are μ-law (for T1), A-law (for
E1), and PCM (Pulse Code Modulation).
- Valid sampling rates are 8 000 Hz, 11 000 Hz, 22 000 Hz, 44 000 Hz, or
any rate you define.
- Valid sample widths are 8 bits and 16 bits.
- The Little Endian PCM and Signed PCM specifications
apply to PCM data only:
- The Endian specification describes how the machine interprets the bytes
in the sample. For example, the Power System stores a 16-bit number in two consecutive
bytes from left to right (Big Endian format). However, Intel machines store
the same number in two consecutive bytes from right to left (Little Endian
format). The internal representation of X’ABCD’ on the Power System is ABCD; on an Intel machine the same number is represented as CDAB.
- The signed PCM specification refers to whether an audio sample can take
both positive and negative values (signed) or only positive values (unsigned).