designing a multiband filter
in [DSP]
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From: bos1234 on 1 Jun 2010 23:24 I have a signal with the spectrum depicted below. I filtered this signal using three individual filters i.e. bandpass and 2 bandstops. Im trying to design a multiband filter which does the same job. However in matlab what does "frequency vector" and magnitude vector mean? and How do they control the designing of the filter?? [IMG]http://i48.tinypic.com/f4in4m.png[/IMG] [IMG]http://i50.tinypic.com/1es9b8.png[/IMG] [IMG]http://i48.tinypic.com/2pr7b0l.png[/IMG]
From: Zhi.Shen on 2 Jun 2010 02:47 Aren't the "frequency vectors" filter's passband or stopband edges? and "magnitude vectors" the magnitudes you need? Also the weights are the different bands ripple's ratio. And you can search the explanation of the function "firpm" in Matlab's Help. I think the reason for your pool magnitude response is that the FIR filter's order is too less. "bos1234" <suren130(a)n_o_s_p_a_m.gmail.com> д����Ϣ����:trGdnZkYpfFBU5jRnZ2dnUVZ_v6dnZ2d(a)giganews.com... >I have a signal with the spectrum depicted below. I filtered this signal > using three individual filters i.e. bandpass and 2 bandstops. Im trying to > design a multiband filter which does the same job. However in matlab what > does "frequency vector" and magnitude vector mean? and How do they control > the designing of the filter?? > > [IMG]http://i48.tinypic.com/f4in4m.png[/IMG] > > [IMG]http://i50.tinypic.com/1es9b8.png[/IMG] > > [IMG]http://i48.tinypic.com/2pr7b0l.png[/IMG]
From: Bob on 3 Jun 2010 13:01 On 2 June, 04:24, "bos1234" <suren130(a)n_o_s_p_a_m.gmail.com> wrote: > I have a signal with the spectrum depicted below. I filtered this signal > using three individual filters i.e. bandpass and 2 bandstops. Im trying to > design a multiband filter which does the same job. However in matlab what > does "frequency vector" and magnitude vector mean? and How do they control > the designing of the filter?? > > [IMG]http://i48.tinypic.com/f4in4m.png[/IMG] > > [IMG]http://i50.tinypic.com/1es9b8.png[/IMG] > > [IMG]http://i48.tinypic.com/2pr7b0l.png[/IMG] If this frequency response fits your needs, you should try ONEoverT filter designer. [IMG]http://i49.tinypic.com/zikvaq.jpg[/IMG]
From: Jaime Andrés Aranguren Cardona on 6 Jun 2010 15:23 On 2 jun, 05:24, "bos1234" <suren130(a)n_o_s_p_a_m.gmail.com> wrote: > I have a signal with the spectrum depicted below. I filtered this signal > using three individual filters i.e. bandpass and 2 bandstops. Im trying to > design a multiband filter which does the same job. However in matlab what > does "frequency vector" and magnitude vector mean? and How do they control > the designing of the filter?? > > [IMG]http://i48.tinypic.com/f4in4m.png[/IMG] > > [IMG]http://i50.tinypic.com/1es9b8.png[/IMG] > > [IMG]http://i48.tinypic.com/2pr7b0l.png[/IMG] Hi, If already got it working with 3 separate filters, why do you need a multiband? Also, should it be FIR, why not IIR? JaaC
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