[PD] URGENT! :Overlap add synthesis

[Justin Glenn Smith]

[ifft~] does overlap add of fft data.

I think you can do this by reading the data from matlab into [array] objects and using a [block~] object to control the ifft frame size.

The help files for [ifft~], [array], and [block~] should be helpful, you may also want to look at the help files in help section I, in particular "I03.resynthesis.pd".

Gün KARAGÖZ wrote:
> I have created frames database in Matlab. I get IR and button data of
> Wiimote to control overlap-add period. I want to realize Time Domain
> Pitch Synchronous OverLap Add (TD-PSOLA) algorithm in pd
> 
> I will get overlap period data from Wiimote IR data.
> 
> For example, I have four frames. All 4 frames have different
> T0(period) values. When I put it them in order, I decide by Wiimote
> data which frames will be mixed by position. And also Wiimote data
> gives me the T0(period) of TD-PSOLA.
> 
> e.g.
> T01=100, T02=300, T03=650, T04=900
> wiimoteData= 250
> newFrame=((300-250)*frame1+(250-100)*frame2)/(200)
> olaPeriod= wiimoteData=250
> 
> newFrame continously overlap-add synthesized by olaPeriod. As the
> wiimoteData changes, calculation of newFrame is done again. newFrame
> is sent to DAC.
> 
> The problem is how can I do overlapAdd syhthesis in Pd?
> 
> This is the brief explanation of problem I think :)
> 
> 
> 
> 
> On 1/10/10, Justin Glenn Smith <noisesmith at gmail.com> wrote:
>> I think he just means standard overlap add fft
>> http://en.wikipedia.org/wiki/Overlap-add_method
>>
>> Which is what fft~ and ifft~ do already, if I am not mistaken.
>>
>> Hans-Christoph Steiner wrote:
>>> Not sure what "overlap add" is, but perhaps you mean additive?  There
>>> are a bunch of tutorials included in Help -> Help Browser ->
>>> 3.audio.examples.
>>>
>>> .hc
>>>
>>> On Jan 9, 2010, at 2:35 PM, Gün KARAGÖZ wrote:
>>>
>>>> Hello everyone!
>>>>
>>>> I am working on my senior design project. It's about creating digital
>>>> musical instrument.
>>>>
>>>> This is my senior design project description:
>>>> The main task is to develop a package of signal processing algorithms
>>>> that can perform real-time audio signal synthesis driven by a
>>>> Wii-remote controller. The project has two parts: analysis (database
>>>> construction) and synthesis. In the analysis part, Matlab tools will
>>>> be designed that construct a sound database automatically from a given
>>>> recording.  The tasks in this part are: fundamental frequency
>>>> estimation, stable frame region detection, frame extraction. In the
>>>> synthesis part, a real-time signal processing environment, PureData,
>>>> will be used to get the Wii controller signal, synthesize the audio
>>>> signal using the database created in the analysis part with the
>>>> frequency defined by the controller signal and send the synthetic
>>>> signal to the soundcard.
>>>>
>>>> I have completed all steps except overlap add synthesis in Puredata.
>>>> Is there any tutorial how we can make overlap add synthesis in pure
>>>> data?
>>>>
>>>> I need a bit urgent help because of deadline! Thank you for everything.
>>>>
>>>> --
>>>> Gun KARAGOZ - http://www.gunkaragoz.net
>>>>
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> 
>