??,?: ??,?: a MPEG2 question

Hi, rsv,
Thank you for your information, I have got the equation from MATLAB11. I still
have some problems in my MPEG DSP solution, which is the subband filter
cooefficient   C(i), can you or anyone else tell me any equation to get those
factors? A look-up table seems not only huge but hard to keep the precision.

regards!
ZiP

-----????-----
???: Prasad R S V [mailto:rsv@rsv@...]
????: 2000?11?29? 20:24
???: ZiP HE
??: Re: ??,?: [audiodsp] a MPEG2 question
	
 Hi ,

   You can find the Hanning window equation in any DSP related books like

   Digital Signal Processing by Proakis and Manalokis  or
   Discrete signal processing by Oppenhiem and  schafer

 or Design of Digital filters by Antoniou etc..

rgds
rsv
 
	On Wed, 29 Nov 2000, ZiP HE wrote:

> Hi, rsv,
> Thank you for your kind reply. can you tell me where I can find the hanning
window equation? ISO11172-3 didnot offer it.
> 
> regards
> ZiP
> 
> -----????-----
> ???: Prasad R S V [mailto:rsv@rsv@...]
> ????: 2000?11?29? 13:01
> ???: ZiP HE
> ??: audiodsp@audi...
> ??: Re: [audiodsp] a MPEG2 question
> 
> 
> 
> 
>  Hi,
>    
>    Generally,the remaining 128 samples are ignored. But the ignored
> samples are not consecutive.The first 64 samples ( 0 to 63) and last 64
> samples ( from 1088 t0 1151 ) are ignored and the central 1024 samples are
> used for FFT.
>   It is not mandatory that we should use 1024 samples for FFT..You can use
> 1152 or 2304 ( previous plus present frame samples) samples for analysis
> purpose. It will not effect the bit stream which specified in the
> standard, but computational complexity will increase.Thta's why
people
> suggest 1024 as the magic number for FFT in MPEG -1 layer 2 &3.
> 
> rgds
> rsv 
> 
> 
> On Tue, 28 Nov 2000, ZiP HE wrote:
> 
> > Dear all,
> > I am a newcomer in DSP, and now working on MPEG-2 Audio Encoder. In
ISO11172-3 encoding algorithms(Layer II and Layer III), before FFT transfer,
there are 1152 samples collected, but only 1024 points FFT are employed, what
shall we do with the remaining 128 samples, just ingnored or shall overlapped by
Module Reduction N?
> > Before FFT an Hanning window is firstly applied.
> > 
> > Best Regards!
> > 
> > ZiP
> > 28/11/00
> > 
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