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C array offset working, upsampled sine wave sounds OK :-)

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drowe67 2021-12-16 07:22:02 +10:30 committed by David Rowe
parent dfcc136583
commit 653713918d
1 changed files with 12 additions and 2 deletions
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14
test/000_resampler/t48_8_short.py
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@ -4,6 +4,14 @@
# Unit test for FreeDV API resampler functions, from
# codec2/unittest/t48_8_short.c - generate a sine wave at 8 KHz,
# upsample to 48 kHz, add an interferer, then downsample back to 8 kHz
#
# You can listen to the output files with:
#
# aplay -f S16_LE in8.raw
# aplay -r 48000 -f S16_LE out48.raw
# aplay -f S16_LE out8.raw
#
# They should sound like clean sine waves
import ctypes
from ctypes import *
@ -44,8 +52,10 @@ for f in range(FRAMES):
in8k[MEM8:] = AMP*np.cos(2*np.pi*np.arange(t,t+N8)*FTEST8/FS8)
t += N8
in8k[MEM8:].tofile(fin8)
codec2.api.fdmdv_8_to_48_short(out48k.ctypes, in8k.ctypes + MEM8, N8);
pin8k,flag = in8k.__array_interface__['data']
pin8k += 2*MEM8
codec2.api.fdmdv_8_to_48_short(out48k.ctypes, pin8k, N8);
out48k.tofile(f48)
fin8.close()