Ответ @Patrice Levesque:
mcc@mcc-Lenovo:~/test_pro$ sox --info -V255 longwav_11k.wav
sox INFO formats: detected file format type `wav'
sox DBUG wav: WAV Chunk fmt
sox DBUG wav: WAV Chunk data
sox DBUG wav: Reading Wave file: Microsoft PCM format, 1 channel, 11025 samp/sec
sox DBUG wav: 22050 byte/sec, 2 block align, 16 bits/samp, 471682 data bytes
sox DBUG wav: 235841 Samps/chans
Input File : 'longwav_11k.wav'
Channels : 1
Sample Rate : 11025
Precision : 16-bit
Duration : 00:00:21.39 = 235841 samples ~ 1604.36 CDDA sectors
File Size : 472k
Bit Rate : 176k
Sample Encoding: 16-bit Signed Integer PCM
Ответ @chirlu:
mcc@mcc-Lenovo:~/test_pro$ sox -V4 longwav_11k.wav -r 8000 -c 1 longwav_temp.wav
sox: SoX v14.4.1
time: May 30 2013 10:34:23
uname: Linux mcc-Lenovo 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64
compiler: gcc 4.6.3
arch: 1288 48 88 L OMP
sox INFO formats: detected file format type `wav'
sox DBUG wav: WAV Chunk fmt
sox DBUG wav: WAV Chunk data
sox DBUG wav: Reading Wave file: Microsoft PCM format, 1 channel, 11025 samp/sec
sox DBUG wav: 22050 byte/sec, 2 block align, 16 bits/samp, 471682 data bytes
sox DBUG wav: 235841 Samps/chans
Input File : 'longwav_11k.wav'
Channels : 1
Sample Rate : 11025
Precision : 16-bit
Duration : 00:00:21.39 = 235841 samples ~ 1604.36 CDDA sectors
File Size : 472k
Bit Rate : 176k
Sample Encoding: 16-bit Signed Integer PCM
Endian Type : little
Reverse Nibbles: no
Reverse Bits : no
sox INFO sox: Overwriting `longwav_temp.wav'
sox DBUG wav: Writing Wave file: Microsoft PCM format, 1 channel, 8000 samp/sec
sox DBUG wav: 16000 byte/sec, 2 block align, 16 bits/samp
Output File : 'longwav_temp.wav'
Channels : 1
Sample Rate : 8000
Precision : 16-bit
Duration : 00:00:21.39 = 171132 samples ~ 1604.36 CDDA sectors
Sample Encoding: 16-bit Signed Integer PCM
Endian Type : little
Reverse Nibbles: no
Reverse Bits : no
Comment : 'Processed by SoX'
sox DBUG rate: i/o=1.37813; 441:640 @ level 0
sox DBUG effects_i_dsp: 1 0.29345 1.5
sox DBUG effects_i_dsp: make_lpf(n=19199, Fc=0.00188523 beta=13.7461 dc-norm=1 scale=640)
sox DBUG rate: fir_len=30 phases=640 coef_interp=0 mult=1 size=154k
sox DBUG effects_i_dsp: 0.4655 0.020248 0.5
sox DBUG effects_i_dsp: make_lpf(n=409, Fc=0.479752 beta=12.8525 dc-norm=1 scale=1)
sox DBUG rate: fir_len=409 dft_length=4096 Fp=0.931 att=125 mult=1
sox DBUG rate: stage=0 pre_post=29 pre=0 preload=14
sox DBUG rate: stage=1 pre_post=0 pre=0 preload=204
sox INFO sox: effects chain: input 11025Hz 1 channels (multi) 16 bits 00:00:21.39
sox INFO sox: effects chain: rate 8000Hz 1 channels 32 bits 00:00:21.39
sox INFO sox: effects chain: dither 8000Hz 1 channels 16 bits 00:00:21.39
sox INFO sox: effects chain: output 8000Hz 1 channels (multi) 16 bits 00:00:21.39
sox WARN rate: rate clipped 5 samples; decrease volume?
sox WARN dither: dither clipped 4 samples; decrease volume?
Я использую входной файл longwav_11k.wav с частотой дискретизации 11025 и 1 каналом.
Спасибо!