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Discussion Groups | Audio Signal Processing | ??,?: ??,?: a MPEG2 question
Technical discussions related to Audio Signal Processing (digital effects, acoustics, noise reduction, musical signal processing, etc).
??,?: ??,?: a MPEG2 question - ZiP HE - Nov 30 3:02:00 2000
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 > > > > -------------------------- eGroups Sponsor -------------------------~-~> > > eLerts > > It's Easy. It's Fun. Best of All, it's Free! > > http://click.egroups.com/1/9699/1/_/414121/_/975431838/ > > ---------------------------------------------------------------------_-> > > > > To Join: audiodsp-subscribe@audi... > > > > To Post: audiodsp@audi... > > > > To Leave: audiodsp-unsubscribe@audi... > > > > Archives: http://www.egroups.com/group/audiodsp > > > > Other DSP-Related Groups: http://www.dsprelated.com > > > > > > > > > > -------------------------- eGroups Sponsor -------------------------~-~> > eGroups eLerts > It's Easy. It's Fun. Best of All, it's Free! > http://click.egroups.com/1/9698/0/_/414121/_/975500335/ > ---------------------------------------------------------------------_-> > > To Join: audiodsp-subscribe@audi... > > To Post: audiodsp@audi... > > To Leave: audiodsp-unsubscribe@audi... > > Archives: http://www.egroups.com/group/audiodsp > > Other DSP-Related Groups: http://www.dsprelated.com > > ------------------------------------------------------------------------ " Simplicity is the ULTIMATE sophistication we can achieve in the life " ------------------------------------------------------------------------ Office: Residence : Prasad R S V, Prasad R S V, Silicon Automation Systems Ltd., 2071,2nd floor, #5 Corporation Div.,#67, 15th main, 7th cross, HAL 3rd Stage,Jeevanbhima nagar, HAL 3rd stage, Bangalore - 560 075. Bangalore - 560 008. phone : 5276100 ext:4408 ******************************************************************************______________________________
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