The steps involved in forming the linear prediction coefficients are as follows.
The steps involved in forming the residual signal are as follows.
The analysis parameters are read from the parameter file.
preemphasis_factor = float ! preemphasis factor (0 to 1, default 0)
window_length = int ! analysis window length
window_offset = int ! initial offset of the center of the analysis
! window from the center of the frame (negative
! values mean that the analysis window precedes
! frame, default 0)
window_type = char ! window type (Hamming or rectangular, default
! Hamming)
frame_length = int ! frame size
LPC_number = int ! number of LPC coefficients
LPC_BW_expansion = float ! bandwidth expansion factor (1 gives no
! bandwidth expansion, default 1)
By default, the output file contains a standard audio file information string.
Standard Audio File Information:
date: 1994-01-25 19:19:39 UTC date
user: kabal@aldebaran user
program: LPanal program name
parameters: <parameters> list of analysis parameters
This information can be changed with the header information string which is
specified as one of the command line options. Structured information records
should adhere to the above format with a named field terminated by a colon,
followed by numeric data or text. Comments can follow as unstructured
information.
Record delimiter: Newline character or the two character escape
sequence "\" + "n".
Line delimiter: Within records, lines are delimiteded by a carriage
control character, the two character escape sequence "\" + "r",
or the two character sequence "\" + newline.
If the information string starts with a record delimiter, the header
information string is appended to the standard header information. If not,
the user supplied header information string appears alone.