Who here can hear above 22kHz......!!!!????...

[birrbits]

just to clarify - the nynquist theory requires an umlimited time frame - i.e. it is an infinite function -

I'll stop your right there.
The nyquist theory says no such thing, it assumes that functions are periodic.

Thanks birrbits. I was about to go there but stopped - I only took the class, I wasn't a teaching assistant. My degree is in Mechanical Engineering, but I did ace the DSP class because it was so interesting to me. Sort of made the EE guys in the class mad.

-Scott

You are braver than me, I tried taking a graduate level mechanical engineering course in acoustics and mechanical vibration. I lasted 3 weeks, as soon as I realized that I couldn't use Fourier analysis to solve wave equation problems I ran away

'What, you mean I have to actually solve these differential equations the hard way?!'

[birrbits]

That wasn't OneGuineaPingOnly was it?

mumbles something incoherent about keys on keyboard

[duncanparsons]

..and I thought that was bait to be caught! I was rather pleased that I got there first, must confess!



DSP

[birrbits]

..and I thought that was bait to be caught! I was rather pleased that I got there first, must confess!



DSP

no that was a real typo, musta had onethoughtonly on the brain...

[Hypertone]

Anyone have any waveforms up that high? I'd like to take a listen and see.

[AudioWhore]

Im not gonna bother recording anything above 24bit/48khz until the year 2010 when computers are more powerful! softsynths at 96k just eat twice the cpu as 48. I'm struggling as it is on my AMD64.

[liqih]

as a note, I can't hear above 15K Hz, anyway when I was younger I only heard 18K Hz,

but I still recognize higher samplerates definition,

extended Hz range it's only 30% of the benfit of using higher samplerates,
clarity and definition are better even the lower frequencies

[The Chase]

with adobe audition's sine wave generator i can hear 21khz but can not tell the difference between that and 15khz. Note that the Television's squeel start's at about 15 khz (larger televisions having lower frequencies for some reason) and many people can't even hear that.

[The Chase]

Anyone have any waveforms up that high? I'd like to take a listen and see.

here you go mate. A winrar file containing sine waves at 10khz, 15khz, 18khz, 19khz, and 20khz. Note: DO NOT OPEN WITH WINAMP. These are 192000/32 ".wav" samples, and winamp will distort them. Also note that these are pure sines at -6db, so be careful not to go deaf:

EDIT: These arent opening in Windows Media Player either for some reason.

www.carothers.info/chase/High_Frequencies.rar

i had to turn up my head A LOT (prolly too much for my own good) to hear 21khz

[duncanparsons]

ta for that chase, these should be fun

I wish I could turn my head up. I only have a pitch control on my neck - dang another pun for the taking!!

DSP

[The Chase]

haha. *headphones

[duncanparsons]

..I won't go with a geeking c++ observation..

*sisters

[No name]

I always heard a peculiar sound when stepping into a room with an electronic on. I can hear this very very high pitched ring noise, and from that I know there is something on in the room. How high is this freq anyways? I know someone has to know, or have heard it.

[No name]

Honestly, Besides 10 I heard 20 the best. 15 dropped out a bit on me though.

[birrbits]

just to clarify - the nynquist theory requires an umlimited time frame - i.e. it is an infinite function -

I'll stop your right there.
The nyquist theory says no such thing, it assumes that functions are periodic. ie, you dont have to wait till infinity to say that a 50 Hz tone is 50Hz.

ok i recant (slightly) as well, I've read the paper you cited in a bit more detail.
Yes, the sampling function in and of itself is a summation from -inf to +inf, so it is an infinite function.

but if you read the second paragraph
'Realistically, we are never presented with an infinite discrete time sequence and are therefore forced to perform the summation over a finite range.'

Nicely though with a summation we can just say the sum was zero before the song started, and zero after it ended (we cheat). The paper you cited is looking for errors that occur because samples are missing or unknown. Its actually unintentionally worded to show that a higher bit depth is affected more by missing sample data. Fortunately this is because the 'error' is derived by being compared to the quantization error.