Re: different when dealing with a wave sound

[Juan Pablo Carbajal]

On Mon, May 12, 2014 at 6:15 PM, Stephen Zhang <address@hidden> wrote:
> Hi, all
> I have a wave sound here[1], which mixed a man's sound with some "beeee"
> sound. I tested this sound in matlab(windows version), octave(windows
> version) and octave(linux  version), but get diffenrent result. Details are
> here:
> I use these commands:
>
> [wav fs bps] = wavread('buzz.wav');
> b = fir1(50, [X Y], 'bandpass');
> y = filter(b, 1, wav);
> wavwrite(y, fs, bps, 'test.wav');
>
> When I set X=0.3, Y=0.7 (in line 2),In matlab and octave(windows version), I
> can clearly hear the man's sound saying "zhe li shi dian zi ke ji da
> xue"(Chinese) without any "beeee" sound while in octave(linux version), I
> can only hear "beeee" sound. Only when I set X=0.8 and Y=0.99 can I hear the
> man's sound(not very clearly) with "beeee" sound in octave's linux version.
> I'd really like to know what causes difference? Is it a bug or just my
> fault?
>
> Thanks a lot to read this email.
> Regards,
> Stephen
>
> [1]http://pan.baidu.com/s/1dDtcTwt
>
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>

I can't reproduce. Without filtering I hear the annoying sound, when I
run your code with X=0.3, Y=0.7 I hear a male person speaking.
What version of Octave(linux) and signal package are you using?
What OS?
Do other wav files play fine?
Do you get any warning when doing wavwrite?