FOAK: Changing MP3 Frequency.
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From: Simian on 22 Apr 2010 10:54 Jim wrote: > On 22/04/2010 10:01, Krusty wrote: > > I've got an MP3 which I want to change to around 22Khz, thus making > > it inaudible to humans. Is such a thing possible without buying > > fancy software? I've got GoldWave but can't figure out how to do it. > > Since most audio equipment available to you is going to use a > sampling rate of 44.1 or 48kHz then surely this isn't going to work - > you will just end up with noise. You can produce a nice 22050Hz sine wave from a 44.1KHz sample rate. Not sure why you'd want to start with an MP3 rather than just write the WAV directly, though. Mind you, if he can 'just about' hear what he's done, it's probably sub-18KHz. And if it's still an MP3, it'll be sub-16KHz. i.e. either he's not actually gone for 22Khz, or he's getting some form of resonance.
From: Switters on 22 Apr 2010 10:59 On Thu, 22 Apr 2010 12:45:50 GMT, Krusty wrote: > Switters wrote: > >> On Thu, 22 Apr 2010 09:19:45 GMT, Krusty wrote: >> >> >> What on earth are you doing? >> > >> > Trying to make the neighbour's dogs kick off every hour through the >> > night without her knowing why. We'll see if she still thinks their >> > barking isn't a problem after a week of no sleep. >> >> Ummm, isn't this going to keep you awake too? > > No, I can barely hear them when I'm in the bedroom & they're in their > house. Unlike during the day when she keeps them locked in a cage right > outside my office window for 12 hours a day. Ah, right. That would get annoying, pretty quickly.
From: Krusty on 22 Apr 2010 11:03 Simian wrote: > Jim wrote: > > > On 22/04/2010 10:01, Krusty wrote: > > > I've got an MP3 which I want to change to around 22Khz, thus > > > making it inaudible to humans. Is such a thing possible without > > > buying fancy software? I've got GoldWave but can't figure out how > > > to do it. > > > > Since most audio equipment available to you is going to use a > > sampling rate of 44.1 or 48kHz then surely this isn't going to work > > - you will just end up with noise. > > You can produce a nice 22050Hz sine wave from a 44.1KHz sample rate. > > Not sure why you'd want to start with an MP3 rather than just write > the WAV directly, though. Because I need something that'll make them bark, i.e. another dog barking. -- Krusty
From: steve robinson on 22 Apr 2010 11:12 Switters wrote: > On Thu, 22 Apr 2010 12:45:50 GMT, Krusty wrote: > > > Switters wrote: > > > >> On Thu, 22 Apr 2010 09:19:45 GMT, Krusty wrote: > >> > >> >> What on earth are you doing? > >> > > >> > Trying to make the neighbour's dogs kick off every hour > through the >> > night without her knowing why. We'll see if she > still thinks their >> > barking isn't a problem after a week of no > sleep. >> > >> Ummm, isn't this going to keep you awake too? > > > > No, I can barely hear them when I'm in the bedroom & they're in > > their house. Unlike during the day when she keeps them locked in > > a cage right outside my office window for 12 hours a day. > > Ah, right. That would get annoying, pretty quickly. If you want a doggie annoyer take a look at information unlimited website , its doubtful you are going to get the range you need from an mp3
From: steve robinson on 22 Apr 2010 11:15
Krusty wrote: > Simian wrote: > > > Jim wrote: > > > > > On 22/04/2010 10:01, Krusty wrote: > > > > I've got an MP3 which I want to change to around 22Khz, thus > > > > making it inaudible to humans. Is such a thing possible > > > > without buying fancy software? I've got GoldWave but can't > > > > figure out how to do it. > > > > > > Since most audio equipment available to you is going to use a > > > sampling rate of 44.1 or 48kHz then surely this isn't going to > > > work - you will just end up with noise. > > > > You can produce a nice 22050Hz sine wave from a 44.1KHz sample > > rate. > > > > Not sure why you'd want to start with an MP3 rather than just > > write the WAV directly, though. > > Because I need something that'll make them bark, i.e. another dog > barking. Krusty i have some schematics of a cannine controller and a sonic pain field generator you can knock up yourself for a few quid if you want copies , i can even supply you component lists |