Re: why 8khz?
Re: why 8khz?
- Subject: Re: why 8khz?
- From: Jens Alfke <email@hidden>
- Date: Thu, 12 Feb 2009 11:57:03 -0800
On Feb 12, 2009, at 10:30 AM, Joel Reymont wrote:
"But if you are also doing a game, you probably don't want all of
the audio in the game to be output at 8KHz"
My understanding is that 8KHz is less fidelity than 44.1Khz (less
samples, right?). Why not output all the audio at 8KHz then?
8khz is for telephony; presumably the iPhone audio hardware runs at
that rate while you're on a phone call. But you certainly don't want
to use that for music or anything you want to sound good, otherwise
it'll come out sounding as though you're listening to it over the
phone :)
(An 8kHz signal can't carry any frequencies over 4kHz. That's about
the bandwidth of the human speaking voice. But your ears can hear
frequencies up to 15kHz or higher, depending on age and how many rock
concerts you've been to. The usual cutoff for human hearing is given
as 20kHz, but I don't think anyone but kids can hear that high. For
comparison, that really high-pitched tone you get from a tube-based TV
set is at about 15kHz, and many adults can't hear it. But just to make
sure, CDs were speced to carry frequencies up to 22kHz, thus a 44kHz
sample rate.)
—Jens _______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
| References: | |
| | >why 8khz? (From: Joel Reymont <email@hidden>) |