Skip to content

Added high_f_factor to add more high frequency channels #33

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
JasonMH17 wants to merge 1 commit into
base: master
Choose a base branch
from
+16 −4
Open

Added high_f_factor to add more high frequency channels #33

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 8 additions & 2 deletions python/src/carfac/jax/carfac.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,8 @@ class CarDesignParameters:
high_f_damping_compression: float = 0.5 # 0 to 1 to compress zeta
erb_per_step: float = 0.5 # assume G&M's ERB formula
min_pole_hz: float = 30
high_f_factor: float = 0 # factor to include more high frequency channels at <100kHz sampling rate
# (0 gives original CARFAC channel arrangement)
erb_break_freq: float = 165.3 # Greenwood map's break freq.
erb_q: float = 1000 / (24.7 * 4.37) # Glasberg and Moore's high-cf ratio
use_delay_buffer: bool = False
Expand Down Expand Up @@ -1768,7 +1770,9 @@ def design_and_init_carfac(
n_ch = 0
while pole_hz > ear_params.car.min_pole_hz:
n_ch = n_ch + 1
pole_hz = pole_hz - ear_params.car.erb_per_step * hz_to_erb(
# set factor that increases channel density at high frequencies
high_f_chan = 1 - ear_params.car.high_f_factor * (pole_hz / params.fs) ** 2
pole_hz = pole_hz - high_f_chan * ear_params.car.erb_per_step * hz_to_erb(
pole_hz, ear_params.car.erb_break_freq, ear_params.car.erb_q
)

Expand All @@ -1781,7 +1785,9 @@ def design_and_init_carfac(
pole_freqs = pole_freqs.at[ch].set(pole_hz)
else:
pole_freqs[ch] = pole_hz
pole_hz = pole_hz - ear_params.car.erb_per_step * hz_to_erb(
# set factor that increases channel density at high frequencies
high_f_chan = 1 - ear_params.car.high_f_factor * (pole_hz / params.fs) ** 2
pole_hz = pole_hz - high_f_chan * ear_params.car.erb_per_step * hz_to_erb(
pole_hz, ear_params.car.erb_break_freq, ear_params.car.erb_q
)
# Now we have n_ch, the number of channels, and pole_freqs array.
Expand Down
10 changes: 8 additions & 2 deletions python/src/carfac/np/carfac.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,8 @@ class CarParams:
high_f_damping_compression: float = 0.5 # 0 to 1 to compress zeta
erb_per_step: float = 0.5 # assume G&M's ERB formula
min_pole_hz: float = 30
high_f_factor: float = 0 # factor to include more high frequency channels at <100kHz sampling rate
# (0 gives original CARFAC channel arrangement)
erb_break_freq: float = 165.3 # Greenwood map's break freq.
erb_q: float = 1000 / (24.7 * 4.37) # Glasberg and Moore's high-cf ratio
ac_corner_hz: float = 20 # AC couple at 20 Hz corner
Expand Down Expand Up @@ -1327,7 +1329,9 @@ def design_carfac(
n_ch = 0
while pole_hz > car_params.min_pole_hz:
n_ch = n_ch + 1
pole_hz = pole_hz - car_params.erb_per_step * hz_to_erb(
# set factor that increases channel density at high frequencies
high_f_chan = 1 - car_params.high_f_factor * (pole_hz / fs) ** 2
pole_hz = pole_hz - high_f_chan * car_params.erb_per_step * hz_to_erb(
pole_hz, car_params.erb_break_freq, car_params.erb_q
)

Expand All @@ -1337,7 +1341,9 @@ def design_carfac(
pole_hz = car_params.first_pole_theta * fs / (2 * math.pi)
for ch in range(n_ch):
pole_freqs[ch] = pole_hz
pole_hz = pole_hz - car_params.erb_per_step * hz_to_erb(
# set factor that increases channel density at high frequencies
high_f_chan = 1 - car_params.high_f_factor * (pole_hz / fs) ** 2
pole_hz = pole_hz - high_f_chan * car_params.erb_per_step * hz_to_erb(
pole_hz, car_params.erb_break_freq, car_params.erb_q
)
# Now we have n_ch, the number of channels, and pole_freqs array.
Expand Down