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: William Stewart <email@hidden>
- Date: Fri, 19 Feb 2010 10:43:33 -0800
On Feb 19, 2010, at 10:38 AM, Thomas David Kehoe wrote:
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?
no- its not binary. it is 1kbit more.
So 705 kbits is
257-to-the-power-of-two times more data, or 66,049 times more data?
no - its not binary.
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
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