siggigue/pyfilterbank

Implementing a fractional octave filterbank for python. Based on Numpy and CFFI.

pyfilterbank's Issues

Wrong results when cascading biquads in sosfilter_c

sosfilter_c gives wrong results when cascading multiple biquads. Some simple code to show:

import numpy as np
from pyfilterbank.sosfiltering import sosfilter_c
from scipy.signal import sosfilt

sos0 = np.array([
    [0.9994671940803528, -1.980954885482788, 0.9816480278968811, 1.0, -1.9809452295303345, 0.981124997138977],
    [0.9940603375434875, -1.8794806003570557, 0.89670330286026, 1.0, -1.8794806003570557, 0.8907635807991028]
])
sos1 = sos0.flatten()

x = np.random.random((16,))
z0 = np.zeros((sos0.shape[0], 2))
y0, z0 = sosfilt(sos0, x, zi=z0)

y1, z1 = sosfilter_c(x, sos1)

y2, _ = sosfilter_c(x, sos0[0])
y2, _ = sosfilter_c(y2, sos0[1])

y0 and y2 are identical except the numerical precision but y1 is incorrect.

Adding to Anaconda pakages list

I don't know much compiling and enviroment handling, the thing is that I can only import pyfilterbank if the module directory is in my working directory... how can the pakage be added to the default modules path? I'm on win10 using Spyder through Anaconda3

Error installing on M1 Mac / Python 3.8 (sosfilt.so no suitable image found)

I successfully installed pyfilterbank according to the installation on the README, with no errors.

But when I imported pyfilterbank in my Jupiter notebook I received this error:

OSError: cannot load library '/Users/bg/miniforge3/envs/tf/lib/python3.8/site-packages/pyfilterbank/sosfilt.so': dlopen(/Users/bg/miniforge3/envs/tf/lib/python3.8/site-packages/pyfilterbank/sosfilt.so, 2): no suitable image found.  Did find:
	/Users/bg/miniforge3/envs/tf/lib/python3.8/site-packages/pyfilterbank/sosfilt.so: unknown file type, first eight bytes: 0x7F 0x45 0x4C 0x46 0x02 0x01 0x01 0x00
	/Users/bg/miniforge3/envs/tf/lib/python3.8/site-packages/pyfilterbank/sosfilt.so: unknown file type, first eight bytes: 0x7F 0x45 0x4C 0x46 0x02 0x01 0x01 0x00.  Additionally, ctypes.util.find_library() did not manage to locate a library called '/Users/bg/miniforge3/envs/tf/lib/python3.8/site-packages/pyfilterbank/sosfilt.so'

Any advice on how to resolve this issue?

Not on PyPi

Hi. This library seems quite useful, especially for Gammatone which I have not found many other good packages for. However it is not installable with pip from PyPI. Can you add it there?

Two small issus

splweighting.weight_signal():
Argument in function definition ist data, but in return value x is used.
Simple fix would be changing x to data in call of lfilter()

octbank (multiple functions):
I assume there were some code changes in numpy 1.12 or 1.13 that start checking for integers as argument of np.zeros() , np.abs() and others. So it is necassary to cast the divisions, at least in my setup (Python 3.5.3)

Error when installing in Raspberry pi 3 + B sosfilt.so: wrong ELF class: ELFCLASS 64

After the following steps in python 2.7.9:

• download and unzip the package
• python install pyfilterbank
• add from pyfilterbank import FractionalOctaveFilterBank
  When running the python file I get an error related with:
  sosfilt.so: wrong ELF class: ELFCLASS 64

Thanks.

Documentation - Compiling the c source

$ gcc -c -std=c99 -O3 sosfilter.c
$ gcc -shared -o sosfilter.so sosfilter.o

should be changed into

$ gcc -c -std=c99 -O3 sosfilt.c
$ gcc -shared -o sosfilt.so sosfilt.o

Wrong dBA meassurements?

Hi guys,

First thanks for writing this library. I'm using it for a sound project where I read the input from a microphone using the sounddevice library for python then giving the data to your library for dBa measurements.

The result is a bit off. When recording a quiet room using the microphone (samplerate 44100, dtype = int16), I get 30dBa. But when turning on a decibel-device (UNI-T UT353) it reads 40dBa.

Is my code wrong, or the UNI-T decibel-device?

Could it be that my ndarray contains int16, and not int24?

Allows for negative/above-Nyquist frequencies

e.g.:

fbank = pyfilterbank(gammatone.GammatoneFilterbank(
    48000, startband=-16, endband=32)
print(fbank.centerfrequencies)

will return frequencies from -14 to 36000.

function 'sosfilter_double_mimo' not found in library

Hi,
I am trying to use the pyfilterbank library under Ubuntu. When I try to run the example script
from pyfilterbank import octbank
octbank.example_plot()
I get the error "AttributeError: sosfilter_double_mimo: "function 'sosfilter_double_mimo' not found in library '/usr/local/lib/python2.7/dist-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/sosfilt.so': /usr/local/lib/python2.7/dist-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/sosfilt.so: undefined symbol: sosfilter_double_mimo".
Can anyone help me to fix the problem?
Best regards,
G.

import fails

Looks like you programmed exactly what I need. However, when running
import pyfilterbank
I get this error message:
cannot load library ./pyfilterbank/sosfilt.so: dlopen(./pyfilterbank/sosfilt.so, 2): no suitable image found. Did find: ./pyfilterbank/sosfilt.so: unknown file type, first eight bytes: 0x7F 0x45 0x4C 0x46 0x02 0x01 0x01 0x00
Any idea what to change?

Little mistake in octbank.py

Hi guys,

I may have noticed a small error in the standardized_nominal_frequencies array in the octbank.py file. I would say that the 3 value between 0.6 & 0.8 is wrong. It's not a big problem if you notice it, but you might want to change it if I'm right.

Thanks for your helpful work!

OSError on Pycharm

Hello, I installed the module and get this when running:

File "/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/init.py", line 11, in
from . import butterworth
File "/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/butterworth.py", line 9, in
from pyfilterbank.sosfiltering import bilinear_sos
File "/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/sosfiltering.py", line 74, in
_c = ffi.dlopen(_mylibpath)
File "/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/cffi/api.py", line 150, in dlopen
lib, function_cache = _make_ffi_library(self, name, flags)
File "/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/cffi/api.py", line 832, in _make_ffi_library
backendlib = _load_backend_lib(backend, libname, flags)
File "/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/cffi/api.py", line 827, in _load_backend_lib
raise OSError(msg)
OSError: cannot load library '/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/sosfilt.so': dlopen(/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/sosfilt.so, 2): no suitable image found. Did find:
/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/sosfilt.so: unknown file type, first eight bytes: 0x7F 0x45 0x4C 0x46 0x02 0x01 0x01 0x00
/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/sosfilt.so: unknown file type, first eight bytes: 0x7F 0x45 0x4C 0x46 0x02 0x01 0x01 0x00. Additionally, ctypes.util.find_library() did not manage to locate a library called '/Users/lautaro_wlasenkov/opt/anaconda3/envs/pl-4_6/lib/python3.7/site-packages/pyfilterbank/sosfilt.so'

Can you help me?

Cookbook or tutorial?

Great project!

Besides the documentation regarding the different modules. Can you reference some information regarding what exactly each module do theoretically?

Is there a cookbook?

error in test pyoct

• OS: macosX - 10.11.3
• additional packages: cffti and bumpy
• command line for installing pyfilterbank: sudo python setup.py install

Dear all,

I would like to use this library for sound analysis in python but i have an error:
command: python test_octbank.py

Traceback (most recent call last): File "test_octbank.py", line 3, in <module> import pyfilterbank.octbank as fb File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/__init__.py", line 11, in <module> from . import butterworth File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/butterworth.py", line 9, in <module> from pyfilterbank.sosfiltering import bilinear_sos File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/sosfiltering.py", line 74, in <module> _c = ffi.dlopen(_mylibpath) File "/usr/local/lib/python2.7/site-packages/cffi/api.py", line 139, in dlopen lib, function_cache = _make_ffi_library(self, name, flags) File "/usr/local/lib/python2.7/site-packages/cffi/api.py", line 742, in _make_ffi_library backendlib = _load_backend_lib(backend, libname, flags) File "/usr/local/lib/python2.7/site-packages/cffi/api.py", line 731, in _load_backend_lib return backend.load_library(name, flags) OSError: cannot load library /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/sosfilt.so: dlopen(/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/sosfilt.so, 2): no suitable image found. Did find: /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyfilterbank-0.0.0-py2.7.egg/pyfilterbank/sosfilt.so: unknown file type, first eight bytes: 0x7F 0x45 0x4C 0x46 0x02 0x01 0x01 0x00

please could you help me?