freqz produces incorrect output
Frederick_Umminger at playstation.sony.com
Frederick_Umminger at playstation.sony.com
Wed Dec 24 14:53:00 CST 2008
Bug report for Octave 3.0.3 configured for i686-pc-msdosmsvc
Description:
-----------
The command [h,w] = freqz(b) produces an incorrect answer if the vector
b has length greater than 512.
Similarly for [h,w] = freqz(b,a) , [h,w] = freqz(b,a,n) if the length of
b or a is greater than 512, n respectively.
Repeat-By:
---------
% Compute the spectrum of an audio file
[audio, fs] = auload("InputSample.wav");
[h_audio, w_audio] = freqz(audio );
Fix:
---
This is because the branch of the code that uses the fft as a
replacement for polyval has an implicit assumption about relative sizes.
If this assumption is violated, then the call to postpad truncates b and
a.
In order to be correct, this code must be rewritten to sum over multiple
ffts when either b or a is larger than n.
Configuration (please do not edit this section):
-----------------------------------------------
uname output: Windows
configure opts:
Fortran compiler: fc-msvc
FFLAGS: -O2
F2C: @F2C@
F2CFLAGS: @F2CFLAGS@
FLIBS: -lhdf5 -lzlib -lf2c -lkernel32
CPPFLAGS: -I. -Ic:/Software/VCLibs/include
INCFLAGS: -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler: cc-msvc, version
CFLAGS: -O2 -MD
CPICFLAG:
C++ compiler: cc-msvc, version
CXXFLAGS: -O2 -EHs -MD
CXXPICFLAG:
LD_CXX: cc-msvc
LDFLAGS:
LIBFLAGS: -L.
RLD_FLAG:
BLAS_LIBS: -llapack -lblas
FFTW_LIBS: -lfftw3
LIBS: -lreadline -lncurses -lhdf5 -lzlib -lws2_32 -lkernel32
LEXLIB:
LIBGLOB: -lglob
SED: /usr/bin/sed
DEFS:
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-D__NO_MATH_INLINES=1 -DCXX_NEW_FRIEND_TEMPLATE_DECL=1
-DCXX_ISO_COMPLIANT_LIBRARY=1 -DCXX_ABI=unknown -DHAVE_QHULL=1
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-DF77_FUNC_(name,NAME)=name ## __ -DHAVE_BLAS=1
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-DHAVE_SUITESPARSE_CCOLAMD_H=1 -DHAVE_CCOLAMD=1
-DHAVE_SUITESPARSE_CHOLMOD_H=1 -DHAVE_CHOLMOD=1 -DHAVE_SUITESPARSE_CS_H=1
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-DHAVE_STRNICMP=1 -DHAVE_TEMPNAM=1 -DHAVE_UMASK=1 -DHAVE_UNLINK=1
-DHAVE_UTIME=1 -DHAVE_VFPRINTF=1 -DHAVE_VSPRINTF=1 -DHAVE_VSNPRINTF=1
-DHAVE__CHMOD=1 -DHAVE__SNPRINTF=1 -DHAVE__UTIME32=1
-DOCTAVE_HAVE_BROKEN_STRPTIME=1 -D_USE_MATH_DEFINES=1
-DHAVE_LOADLIBRARY_API=1 -DENABLE_DYNAMIC_LINKING=1 -DHAVE__FINITE=1
-DHAVE__ISNAN=1 -DHAVE__COPYSIGN=1 -DHAVE_DECL_SIGNBIT=0
-DHAVE_STRUCT_STAT_ST_RDEV=1 -DHAVE_DECL_TZNAME=1 -DHAVE_TZNAME=1
-DCLOSEDIR_VOID=1 -DMKDIR_TAKES_ONE_ARG=1 -DUSE_READLINE=1
-DRETSIGTYPE=void -DHAVE_DECL_SYS_SIGLIST=0 -DMUST_REINSTALL_SIGHANDLERS=1
-DRETSIGTYPE_IS_VOID=1 -DGNUPLOT_BINARY="pgnuplot"
User-preferences (please do not edit this section):
EDITOR = C:\Program Files\Octave\tools\wscite\SciTE.exe
EXEC_PATH = C:\Program Files\Octave\msys\bin;C:\Program
Files\Octave\libexec\octave\3.0.3\site\exec\i686-pc-msdosmsvc;C:\Program
Files\Octave\libexec\octave\api-v32\site\exec\i686-pc-msdosmsvc;C:\Program
Files\Octave\libexec\octave\site\exec\i686-pc-msdosmsvc;C:\Program
Files\Octave\libexec\octave\3.0.3\exec\i686-pc-msdosmsvc;C:\Program
Files\Octave\bin;C:\Program
Files\Octave;C:\usr\local\cell\\host-win32\bin;C:\usr\local\cell\\host-win32\Cg\bin;C:\Program
Files\SN Systems\Common\VSI\bin;C:\Program Files\SN
Systems\PS3\bin;C:\Program Files\SN
Systems\Common\bin;C:\usr\local\cell\\host-win32\sn\bin;C:\usr\local\cell\\host-win32\spu\bin;C:\usr\local\cell\\host-win32\ppu\bin;C:\Perl\site\bin;C:\Perl\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program
Files\Intel\DMIX;C:\Program Files\Common Files\Roxio
Shared\DLLShared\;c:\Program Files\Microsoft SQL
Server\90\Tools\binn\;C:\Program Files\CollabNet Subversion
Server;C:\Program Files\QuickTime\QTSystem\;C:\Program
Files\TortoiseSVN\bin;C:\Program Files\sox-14.2.0
IMAGE_PATH = .;C:\Program Files\Octave\share\octave\3.0.3\imagelib
PAGER = less
PS1 = \s:\#>
PS2 = >
PS4 = +
beep_on_error = 0
completion_append_char =
crash_dumps_octave_core = 1
echo_executing_commands = 0
fixed_point_format = 0
gnuplot_binary = pgnuplot
gnuplot_command_end =
gnuplot_command_plot = pl
gnuplot_command_replot = rep
gnuplot_command_splot = sp
gnuplot_command_title = t
gnuplot_command_using = u
gnuplot_command_with = w
history_file = H:\.octave_hist
history_size = 1024
ignore_function_time_stamp = system
info_file = C:\Program Files\Octave\share\info\octave.info
info_program = info
makeinfo_program = makeinfo
max_recursion_depth = 256
output_max_field_width = 5
output_precision = 5
page_output_immediately = 0
page_screen_output = 1
print_answer_id_name = 1
print_empty_dimensions = 1
save_precision = 16
saving_history = 1
sighup_dumps_octave_core = 1
sigterm_dumps_octave_core = 1
silent_functions = 0
split_long_rows = 1
string_fill_char =
struct_levels_to_print = 2
suppress_verbose_help_message = 0
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