anyone have 44000hz voice recording on their mp3 player?

prost

Portable flash players that is. What make/model & price?

Mine only does 32000hz.

superscaper

Why do you need something so high? I thought the limits of human hearing were about 20 KHz

Edit: I'm an idiot who's blanked traumatic Nyquist-Shannon lectures from my mind

bat999

superscaper wrote: »

I thought the limits of human hearing were about 20 KHz

You're right.
But the 32KHz and 44KHz doesn't refer to the audio frequencies.
They are the sample rates.
It means that the analogue waveform is sampled 32000 or 44000 times each second. And each time that happens the sample is converted to a binary number and stored - ie digitized.
During playback the reverse happens and the sinusoidal waveforms are reconstructed for our ears.
Those reconstructed sine waves when looked at closely will actually be 'staircases'. But when the higher sample rate is used the steps are closer together and half as high, which is better.
And as for the bit rate (64Kb/s, 128Kb/s, 256Kb/s etc) it gets confusing (for me). I think that when a higher bit rate is used then the binary number stored can have more bits, so it's a more accurate value.
:cool:

Lorian

If you can tell the difference you have better hearing than me.

superscaper

bat999 wrote: »

You're right.
But the 32KHz and 44KHz doesn't refer to the audio frequencies.
They are the sample rates.
:cool:

I kind of suspected that may be the case (Shannon theory etc :rolleyes:). But I couldn't find anywhere that had such high sampling rates and they didn't seem to use frequency in terms of sampling rate. So basically OP is looking for voice recorder that has sampling rate equivalent of an audio CD. At least I understand now. Although I'd still be sceptical of any noticeable difference between those sampling rates for typical voice recording.

bat999

superscaper wrote: »

Although I'd still be sceptical of any noticeable difference between those sampling rates for typical voice recording.

Me too.
CD quality voice recording is almost an oxymoron.:D

£$&*"($£&(

The other thing to say is that the maximum frequency that can be recorded is precisely half the sample rate. Mind you if the sample rate is only 32khz a 16khz max frequency is going to be fine for voice recording especially if your recording to MP3. Most people don't hear much above 16khz anyway so you only need the extra frequency for critical and pro recording purposes such as recording vocals for music. And you don't use MP3 for such purposes.

superscaper

bat999 wrote: »

almost an oxymoron.:D

Is "almost an oxymoron" an oxymoron? My head hurts now.

superscaper

grahawk wrote: »

Most people don't hear much above 16khz anyway

What was that? Speak up young man!

bat999

grahawk wrote: »

The other thing to say is that the maximum frequency that can be recorded is precisely half the sample rate.

Yes, that makes sense.
So, in an extreme case, using a 44KHz sample rate you could sample a 22KHz waveform - once on each positive half cycle and once on each negative half cycle.
:cool:

prost

Thanks folks

https://www.bcae1.com/sampling.htm has a great article about this too. 32khz is enough for voice.