[[email protected]]

Hello

i've got a .wav file at 44100 hz, and i need it to play at 88200 hz so
that it plays twice faster and an octave higher. (my soundcard
supports 24 bit 96khz)

any idea of a mac software which would do this ? i really need the
file to stay intact, just played at 88200hz.

thanks

[Don Pearce]

On 25 Feb 2007 20:56:26 -0800, wrote:

Hello

i've got a .wav file at 44100 hz, and i need it to play at 88200 hz so
that it plays twice faster and an octave higher. (my soundcard
supports 24 bit 96khz)

any idea of a mac software which would do this ? i really need the
file to stay intact, just played at 88200hz.

thanks

Get yourself a hex file editor and edit the sample rate part ( four
bytes) in the format chunk of the header. Google for RIFF header to
find the right bytes.

d

--
Pearce Consulting
http://www.pearce.uk.com

[cmcadams]

I don't use Mac, but a binary editor should work.

Presuming that Mac .wavs correspond to Win .wavs (and that Mac editors
correspond to Win editors!), at offset 18h (decimal 24) from the
beginning of the file you should see a '44' followed by an 'ac'. This
is a "little-endian" hexadecimal representation of 44100. To change
that file's bitrate to 88200Hz, the "44ac" would be changed to
"885801". From 44100Hz (ac44 hex)to 88200 (15888 hex). I'm being
tedious about hex because that's what binary editors use.

I use this method, successfully, to record 78rpm records at 33-1/3.

Good luck.


wrote:
Hello

i've got a .wav file at 44100 hz, and i need it to play at 88200 hz so
that it plays twice faster and an octave higher. (my soundcard
supports 24 bit 96khz)

any idea of a mac software which would do this ? i really need the
file to stay intact, just played at 88200hz.

thanks

[Romeo Rondeau]

wrote:
Hello

i've got a .wav file at 44100 hz, and i need it to play at 88200 hz so
that it plays twice faster and an octave higher. (my soundcard
supports 24 bit 96khz)

any idea of a mac software which would do this ? i really need the
file to stay intact, just played at 88200hz.

thanks


Load it into an editor and then change the sample playback rate to 88.2k.

[[email protected]]

thanks everyone

i've managed to do the hex edit trick. but i've found 88200 hz is an
octave too much !
from 44100 to 88200 there are two octaves... so i need 66150.
i didn't manage to set a 24 bit 44 khz file to 66150 hz ... any help ?

i think 'Peak' could have done the job but my trial expired ...
logic pro also has a frequency change thing but it's set to
44100/48000/88200 so no luck ...

thanks

[Romeo Rondeau]

wrote:
thanks everyone

i've managed to do the hex edit trick. but i've found 88200 hz is an
octave too much !
from 44100 to 88200 there are two octaves... so i need 66150.
i didn't manage to set a 24 bit 44 khz file to 66150 hz ... any help ?

i think 'Peak' could have done the job but my trial expired ...
logic pro also has a frequency change thing but it's set to
44100/48000/88200 so no luck ...

88.2k is exactly ONE octave higher than 44.1k. So, tell us why you need
this file to play at 88.2k, maybe there's another solution.

[Laurence Payne]

On 26 Feb 2007 05:09:01 -0800, wrote:

thanks everyone

i've managed to do the hex edit trick. but i've found 88200 hz is an
octave too much !
from 44100 to 88200 there are two octaves... so i need 66150.
i didn't manage to set a 24 bit 44 khz file to 66150 hz ... any help ?

i think 'Peak' could have done the job but my trial expired ...
logic pro also has a frequency change thing but it's set to
44100/48000/88200 so no luck ...

thanks

[Laurence Payne]

On 26 Feb 2007 05:09:01 -0800, wrote:

thanks everyone

i've managed to do the hex edit trick. but i've found 88200 hz is an
octave too much !
from 44100 to 88200 there are two octaves... so i need 66150.
i didn't manage to set a 24 bit 44 khz file to 66150 hz ... any help ?

i think 'Peak' could have done the job but my trial expired ...
logic pro also has a frequency change thing but it's set to
44100/48000/88200 so no luck ...

You've slipped a figure somewhere. Double frequency is a one-octave
shift.

[[email protected]]

you're right ... there seems to be a bug then somewhere... couldn't
figure it out.
some files would play properly at 88200hz and have an octave, some
would play twice faster like at 1 764000hz ...
anyway i'll clear this up.

i'm experimenting with a revox A77 ...

thanks !

[Romeo Rondeau]

wrote:
you're right ... there seems to be a bug then somewhere... couldn't
figure it out.
some files would play properly at 88200hz and have an octave, some
would play twice faster like at 1 764000hz ...
anyway i'll clear this up.

i'm experimenting with a revox A77 ...

thanks !



Why don't you just shift it up an octave? This is why I asked you what
you need it to play back at 88.2k for... what you need to do is really
simple, you are making it so complicated :-)

[david correia]

In article . com,
wrote:

Hello

i've got a .wav file at 44100 hz, and i need it to play at 88200 hz so
that it plays twice faster and an octave higher. (my soundcard
supports 24 bit 96khz)

any idea of a mac software which would do this ? i really need the
file to stay intact, just played at 88200hz.

thanks




You need Soundhack. And it's free.


http://soundhack.com/freeware.php





David Correia
www.Celebrationsound.com