Re: Need to hire a software developer for a voice processing app!
Re: Need to hire a software developer for a voice processing app!
- Subject: Re: Need to hire a software developer for a voice processing app!
- From: Thomas David Kehoe <email@hidden>
- Date: Fri, 19 Feb 2010 11:38:54 -0700
- Thread-topic: Need to hire a software developer for a voice processing app!
On 2/19/10 12:39 AM, "tahome izwah" <email@hidden> wrote:
> Last time I checked AUPitch wasn't supported on the phone. There are
> other alternatives, even free ones such as DIRAC which is also
> available for the iPhone:
> http://www.dspdimension.com/technology-licensing/dirac2-iphone/
>
> Also, the DSP Dimension have done DSP development for our studios in
> the past so you might want to contact them. Another company that comes
> to mind is Art & Logic (http://www.artandlogic.com)
DSP Dimension's website says:
"DIRAC2 brings the power of DIRAC to your iPhone projects. Highly optimimzed
for the ARM6 and 7 processors this library allows affordable studio quality
time stretching in any of your apps without much effort. DIRAC2 on the
iPhone has been specially designed and optimized to run near-realtime
(preview mode) on the iPhone. Higher quality modes are also available."
The DIRAC PRO version has unlimited sample rates, so I'm sure if the
sampling is reduced it could run in real-time. My company's speech aids use
a Yamaha pitch-shifting chip with 448 kbits per second (14-bit, 32 kHz)
sampling. In comparison CD-quality is 705 kbits per second (16-bit, 44.1
kHz). I can clearly hear a difference when processing my voice, but 448
kbits is perfectly acceptable.
BTW, is 449 kbits twice as much data as 448 kbits? So 705 kbits is
257-to-the-power-of-two times more data, or 66,049 times more data?
DSP Dimension's website also has an article about pitch shifting, "Pitch
Shifting Using The Fourier Transform":
http://www.dspdimension.com/admin/pitch-shifting-using-the-ft/
--
Thomas David Kehoe
Casa Futura Technologies
http://www.casafuturatech.com
>
> HTH
> --th
> _______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Coreaudio-api mailing list (email@hidden)
> Help/Unsubscribe/Update your Subscription:
>
m
>
> This email sent to email@hidden
_______________________________________________
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