ABF) Convert WAV from 44KB/S to 11KB/Sec

[Anton Feiertag]

Hi there

Does anybody know how to convert a WAVE file recorded in 44KB/Sec (CD
Quality) to 11KB/Sec? Maybe a small example.

Please e-mail me directly.

Kind greetings,
Anton Feiertag <dok...@iafrica.com> Pretoria, South-Africa

[Seb_Nath]

Hello,

44 KB/s is not CD quality !
CD quality = 44100 samples of 16 bits word in stereo = 44100 * 2 bytes *
2 channels = 176400 bytes/s -> 172.3 KB/s

If you want to convert CD quality to 11 Khz ( 11025 samples ) 16 bits
stereo then you just have to pick up some data in the file every 4 data (
1 data = 2 bytes in this case ) or you can interpolate data with an
algorythm to resample at 11 Khz or another rate.
I don't have any example because i'm just a user of sample :)
HTH
--
Seb

Email : Remplacer SPAM par COM dans l'adresse Email
Replace SPAM by COM in my Email address

Anton Feiertag <dok...@iafrica.com> wrote in article
<6qp76t$8l6$1...@news01.iafrica.com>...

[John_Mertus]

In article <6qp76t$8l6$1...@news01.iafrica.com>, dok...@iafrica.com says...

>
>Hi there
>
>Does anybody know how to convert a WAVE file recorded in 44KB/Sec (CD
>Quality) to 11KB/Sec? Maybe a small example.
>

>In article <01bdc528$37118260$5d1e67d1@seb>, seb...@biogate.SPAM says...

>
>Hello,
>
>44 KB/s is not CD quality !
>CD quality = 44100 samples of 16 bits word in stereo = 44100 * 2 bytes *
>2 channels = 176400 bytes/s -> 172.3 KB/s
>
>
>If you want to convert CD quality to 11 Khz ( 11025 samples ) 16 bits
>stereo then you just have to pick up some data in the file every 4 data (
>1 data = 2 bytes in this case ) or you can interpolate data with an
>algorythm to resample at 11 Khz or another rate.

Picking points is not the proper way to convert. If you do, you will
alias the high frequences down into the low ones. More then theory, done
to music it sounds terrible. The second way, of filtering the wav file
and then resampling is correct. The key is to use the correct filter.

One way to convert is to go to Sound Recorder, load the file, choose
properties from the file menu and change from 44 to 11 khz. Then save the
file. It will be in 11Khz format.

If you have a lot of files, I have a program which does multiple files.
It can be download from my web page at www.cog.brown.edu/~mertus.
Both Sound Recorder and my programs use the same filters for conversion.

-John_Mertus

[Seb_Nath]

Yes, sure for the pick method :)
I shoud have say " sound noisily " .