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Topic: 22050 hz WAV to MP3, keep 10000-11025 hz intact (Read 4716 times) previous topic - next topic
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22050 hz WAV to MP3, keep 10000-11025 hz intact

I'm modding a game so I can use my own tracks and it only supports mp3 format. I have a 22050 hz (11025 hz on both channels) WAV file from a different game I've extracted. This is not the standard 44100 hz!

I've tried LAME @ max settings and it keeps cutting the frequencies above 10 khz. It sounds darker. I used to think MP3 encoders would usually cut above 16 khz, but this isn't the case. I need a converter that'll keep the frequencies between 10000 hz - 11025 hz intact.

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #1 –
Try the LAME parameter
--lowpass 11

as in
-V5 --lowpass 11

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #2 –
What exactly do you mean by "22050 hz (11025 hz on both channels) WAV file"?

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #3 –
There may be some benefit in resampling first:
Code: [Select]
# Create test input:
sox -r 22050 -n 1.wav synth 11.025 sine 0:11025 gain -3

# Encode/resample with lame:
lame -V5 --lowpass 11 --resample 44.1 1.wav 2.mp3

# Output has some roll-off and artefacts around 11k:
sox 2.mp3 -n spectrogram -hwk -o 2.png -t lame
display 2.png

# Pre-resample using sox with steep filter:
sox 1.wav 1r.wav rate -s 44.1k

# Encode with lame:
lame -V5 1r.wav 2r.mp3

# No apparent problems:
sox 2r.mp3 -n spectrogram -hwk -o 2r.png -t "sox + lame"
display 2r.png

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #4 –
Try this:

lame -V 1 --lowpass 11.025

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #5 –
I would probably resample to 44.1k.

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #6 –
Quote from: phofman on
What exactly do you mean by "22050 hz (11025 hz on both channels) WAV file"?

Not all WAV comes in the standard 44100 hz. I don't want people to assume it was 44100 hz to begin with and tell me that no one would notice too much of a difference above 16 khz anyways.

Edit: I have found the game soundtrack (didn't know it existed)! This one is 44100 hz!

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #7 –
Quote from: brncao on
Quote from: phofman on
What exactly do you mean by "22050 hz (11025 hz on both channels) WAV file"?

Not all WAV comes in the standard 44100 hz. I don't want people to assume it was 44100 hz to begin with and tell me that no one would notice too much of a difference above 16 khz anyways.

Edit: I have found the game soundtrack (didn't know it existed)! This one is 44100 hz!


If its 11025 on both channels it would be a 11025 hz wav. If its 22050 then both channels are also 22050.
 

22050 hz WAV to MP3, keep 10000-11025 hz intact

Reply #8 –
Offtopic about samplerate: That's a common misconception. People sometimes think that a file has  2X the samplerate versus its frequency range because of it being stereo.  There's a similar misconception with 16bits.