Does Anyone read Mr.Harris's book "Multirate signal processing for communication systems"
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From: Zhi.Shen on 18 May 2010 04:26 Hi, Friends! Does anyone read Mr. Fredric Harris's book "Multirate signal processing for communication systems" ? I think it's a good book for engineering, but some descriptions make me confused. On page 53, Chapter 3 "For a specific example, the filter presented in Figure 3.20 designed for 60dB side-lobe levels is used in a 32-to-1 down sampling application. If the side-lobes are equiripple at 60-dB the integrated side-lobe level is -36.1dB which, when distributed over the remaining bandwidth of 1/32 (-15.1 dB) of input sample rate, results in an effective alias side-lobe suppression of -51 .2dB, equivalent." Who knows the "integrated side-lobe level"'s meaning? And why it's "-36.1dB "? It's a pity that Mr.Harris may does not receive my Email and doesn't reply. Who can give me a help for this question? --- news://freenews.netfront.net/ - complaints: news(a)netfront.net ---
From: dbd on 18 May 2010 11:29 On May 18, 1:26 am, "Zhi.Shen" <zhi.m.s...(a)gmail.com> wrote: > Hi, Friends! > > Does anyone read Mr. Fredric Harris's book > "Multirate signal processing for communication systems" ? > > I think it's a good book for engineering, > but some descriptions make me confused. > > On page 53, Chapter 3 > "For a specific example, the filter presented in Figure 3.20 designed for > 60dB side-lobe levels is used in a 32-to-1 down sampling application. If the > side-lobes are equiripple at 60-dB the integrated side-lobe level is -36.1dB > which, when distributed over the remaining bandwidth of 1/32 (-15.1 dB) of > input sample rate, results in an effective alias side-lobe suppression > of -51 .2dB, equivalent." > > Who knows the "integrated side-lobe level"'s meaning? That's the name of the integral of the filter response across all the sidelobes in the stopband. > And why it's "-36.1dB "? That's the calculation of the integral of the filter response across all the sidelobes in the stopband. >... Dale B. Dalrymple
From: Jerry Avins on 18 May 2010 12:14 On 5/18/2010 11:29 AM, dbd wrote: > On May 18, 1:26 am, "Zhi.Shen"<zhi.m.s...(a)gmail.com> wrote: >> Hi, Friends! >> >> Does anyone read Mr. Fredric Harris's book >> "Multirate signal processing for communication systems" ? >> >> I think it's a good book for engineering, >> but some descriptions make me confused. >> >> On page 53, Chapter 3 >> "For a specific example, the filter presented in Figure 3.20 designed for >> 60dB side-lobe levels is used in a 32-to-1 down sampling application. If the >> side-lobes are equiripple at 60-dB the integrated side-lobe level is -36.1dB >> which, when distributed over the remaining bandwidth of 1/32 (-15.1 dB) of >> input sample rate, results in an effective alias side-lobe suppression >> of -51 .2dB, equivalent." >> >> Who knows the "integrated side-lobe level"'s meaning? > > That's the name of the integral of the filter response across all the > sidelobes in the stopband. > >> And why it's "-36.1dB "? > > That's the calculation of the integral of the filter response across > all the sidelobes in the stopband. Of course, it's power that one integrates, not voltage gain. Jerry -- "I view the progress of science as ... the slow erosion of the tendency to dichotomize." --Barbara Smuts, U. Mich. �����������������������������������������������������������������������
From: dbd on 19 May 2010 17:31 On May 19, 1:09 pm, Capt. Convolution <C.Convolut...(a)aol.com> wrote: > ... > > Hi Mr. Dalrymple, > Thank you for your post. I would also like to understand the > origin of the -36.1 dB value. > > A "dB" measurement is "X db = 10*log10(P1/P2)". In this case, will > you please tell what are the values of P1 and P2, and how P1 and P2 > are computed (determined), in that -36.1 dB measurement? > > Thank you very much. > Capt. Convolution P2, the reference for the dB expression, is the peak of the response in the passband. P1 is "the calculation of the integral of the filter response across all the sidelobes in the stopband." The "response" is the magnitude squared. Dale B. Dalrymple
From: Zhi.Shen on 19 May 2010 22:40
Thank you ALL! Friends! I have known the meaning of "integrated side-lobe level" But who can provide a simple example for the calculation process of integrated side-lobe level? If it's the process of Harris's -36.1dB, the Better! > > --- news://freenews.netfront.net/ - complaints: news(a)netfront.net --- --- news://freenews.netfront.net/ - complaints: news(a)netfront.net --- |