Wrong y_coords for high sample rates

[johanez]

I tried using af for audiodata with high sample rates. The resulting spectrograms look correct, however, the y_coords (and underlying fre_band_arr) are not correct. Looks like some too low default is used. Using the high_fre setting does not help.

To reproduce, use e.g. this file: 0170701_213954-MYOMYS-LR_0_0.5.wav with 500 kHz sampling rate.

import audioflux as af
from audioflux.type import SpectralFilterBankScaleType

audio_arr, sr = af.read(
    "20170701_213954-MYOMYS-LR_0_0.5.wav"
)

bft_obj = af.BFT(
    num=128,
    radix2_exp=12,
    samplate=sr,
    scale_type=SpectralFilterBankScaleType.MEL,
    #high_fre=192000, # does not solve the issue

print(sr)
# 500000
print(bft_obj.y_coords()[-1])
# 15948.399 , should be close to 192000 or 250000
print(bft_obj.high_fre)
# 250000 # without high_fre setting, 192 with high_fre setting 

Same issue with files with 384 kHz sr, and also using audioflux.mel_spectrogram

[wtq2255]

@johanez Our current maximum supported sample rate is 196,000, and we plan to support even higher sample rates in the future. If possible, you can downsample the audio before extracting the Mel spectrogram.

[johanez]

Thanks for the quick reply! Good to know