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1996-11-16
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July 16, 1996
Audio File I/O routines
The AFsp package is a library of routines for reading and writing audio files.
The emphasis is on providing support for the type of audio file used by the
speech processing research community. The routines have been designed to be
easy to use, yet provide transparent support the reading of several audio file
formats. A secondary purpose for distributing these routines is to encourage
the use of a standard audio file format for the header information in the
output files.
Audio File Formats:
The following file formats are supported for reading.
- Headerless audio files
- Sun audio files
- RIFF WAVE files
- AIFF/AIFF-C audio files
- NIST SPHERE audio files
- IRCAM soundfiles
- INRS-Telecom audio files
- ESPS sampled data feature files
- Text audio files (NATO/ESPRIT CD-ROM format)
The following file formats are supported for writing.
- Headerless audio files
- AFsp (Sun) audio files
- RIFF WAVE files
- AIFF-C audio files
The audio file open routine automatically senses the input file type. The data
format for the file is passed to the audio file reading routines. The audio
file reading routine does byte swapping and format conversion on the fly as the
file is read. The user sees float data without needing to worry about the
underlying data format.
Audio output files can be one of several standard file types. One of these is
an AFsp audio file, a compatible extension of Sun audio files with additional
header information. Once a file is opened for writing, the user calls routines
which take the user's float data and do byte swapping and format conversion of
the data transparently.
The AFsp routines are written in C and have been tested on DEC, HP, SGI, Sun,
and PC-386 machines, using a number of different compilers (ANSI and non-ANSI).
Several audio file utilities are included in the package. These programs can
also serve as templates for developing other audio file processing routines.
InfoAudio - display information about an audio file.
CompAudio - compare audio files, producing statistics and signal-to-noise
ratio figures.
ConcatAudio - concatenate samples from audio files.
CopyAudio - copy audio files. This program combines samples from input audio
files (an arbitrary linear combination) and writes them to the
output file in a user selectable format. One application is to
provide format conversion for an audio file; another is to combine
samples from multi-channel files.
FiltAudio - filter audio files. This program filters an audio file with an
FIR, IIR or all-pole filter. This program can be used with an
appropriate filter for sample rate conversion.
GenNoise - generate noise. This program generates an audio file containing
Gaussian white noise.
LPanal - demonstration program to do LPC analysis on a speech file.
LPsyn - demonstation program to do LPC synthesis from a residual file.
ResampAudio - resample data from an audio file. This process involves
interpolating between the samples in the original file to create a
new sequence of samples with a new spacing (sampling rate).
The AFsp routines form part of a signal processing library. The full library
is available for anonymous ftp as libtsp-VxRx.tar.Z.
The AFsp routines are covered by copyright, see the file "Copying" for details
of the distribution conditions.
AFsp-V2R0.tar.Z
anonymous ftp from ftp.TSP.EE.McGill.CA in /pub/AFsp
=============
Changes in V2R0
- ResampAudio
- numerous support routine changes
Changes in V1R13
- support for text audio files
Changes in V1R12
- HTML documentation
- demonstration programs for LPC analysis and synthesis
Changes in V1R11
- fix for UTgetHost under Solaris
- update CompAudio (segment length can be specified)
- update InfoAudio (more flexible print option)
- fix for FiltAudio
Changes in V1R10
- added ConcatAudio
- A-law companding
- AIFF/AIFF-C files for read
- RIFF WAVE and AIFF-C files for write
Changes in V1R10a
- fix for long header info strings
Changes in V1R9
- changes for MS-DOS
Changes in V1R8
- changes for Sun CC compiler
Changes in V1R7
- improved IRCAM file support
Changes in V1R6
- added support for WAVES format files
Changes in V1R5
- changes for SGI workstations
Changes in V1R4:
- added GenNoise
- added man pages
=============
Peter Kabal
Department of Electrical Engineering McGill University
+1 514 398-7130 +1 514 398-4470 Fax
kabal@TSP.EE.McGill.CA
$Id: README,v 1.27 1996/07/16 21:31:58 kabal Exp $