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61. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sat, 9 Dec 2006 17:01:30 -0500; Jerry points out a real weakness of many people's approach to FFT analysis - windowing. When I was doing vibration analysis for Kodak we used a B&K 2032 audio spectrum analyzer, which is of course an; /archives//html/TenTec/2006-12/msg00197.html (14,640 bytes)
62. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sat, 9 Dec 2006 17:05:33 -0500; Lin, Are you doing SETI work ? It seems to me I've run into you over there ? Regards, Gary, AA2IZ Grant, you are soooo right. It raises the hair on the back of my neck ;) Jerry said: You hit it on th; /archives//html/TenTec/2006-12/msg00198.html (14,897 bytes)
63. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sat, 9 Dec 2006 17:05:59 -0500; Ooops...I meant that note to Lin to go direct. Please excuse me. Gary Grant, you are soooo right. It raises the hair on the back of my neck ;) You hit it on the head. Doug Smith's NR implementation w; /archives//html/TenTec/2006-12/msg00199.html (14,744 bytes)
64. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sat, 9 Dec 2006 17:12:46 -0500; That's a good book, isn't it Grant ? :) I have several of the in-house publications of B&K that are also very instructive. If its an FIR filter with suitable characteristics, ought to work pretty wel; /archives//html/TenTec/2006-12/msg00200.html (13,437 bytes)
65. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Sat, 9 Dec 2006 17:37:50 -0600; It's true that we're all running blind :-) Grant/NQ5T _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec; /archives//html/TenTec/2006-12/msg00203.html (9,397 bytes)
66. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sat, 09 Dec 2006 21:06:35 -0600; But an FIR or IIR filter can't compare coherent signal to incoherent noise and enhance multiple signals while suppressing the noise between them. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald; /archives//html/TenTec/2006-12/msg00204.html (10,381 bytes)
67. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Sat, 9 Dec 2006 23:03:29 -0600; The textbook I referred to is available from Amazon. You can take it up with the author if you don't agree with the mathematical derivation or operation of a Wiener filter. It is written in English,; /archives//html/TenTec/2006-12/msg00207.html (11,401 bytes)
68. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sun, 10 Dec 2006 00:13:31 -0500; That's right Jerry. But I did not say it could. Just commented that FIR filters work pretty well when made with suitable characteristics. Only the "real" DSP chips I talked about way earlier in some; /archives//html/TenTec/2006-12/msg00208.html (11,824 bytes)
69. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sun, 10 Dec 2006 00:17:47 -0500; And this is why I said the FIR filter works pretty well. It takes a darn good stab at approaching what the really high end filters can do with brute force....without needing the brute force. It canno; /archives//html/TenTec/2006-12/msg00209.html (13,062 bytes)
70. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Sat, 9 Dec 2006 23:51:03 -0600; The Orion and II have TWO 32-bit floating-point ADI SHARC DSP chips. You can find schematics on rfsquared.com, with all the detail you might want (but no lines of code). Iknow we're all trying reall; /archives//html/TenTec/2006-12/msg00210.html (10,051 bytes)
71. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sun, 10 Dec 2006 02:15:24 -0500; Grant.... Well I already took your advice in my previous post and ended my comments on the thread. On the other hand...I'm an aerospace engineer by trade.....and I love discussing how Rockets and Air; /archives//html/TenTec/2006-12/msg00211.html (11,411 bytes)
72. Re: [TenTec] Noise Reduction Setting (score: 1): Author: Lin Davis <linbdavis@earthlink.net>; Date: Sun, 10 Dec 2006 11:50:56 -0500; I'm going to go out on a limb here. The following is based on what I understand about discrete-time filters, and I admit I am not fluent in their design, but may understand the theory enough to post; /archives//html/TenTec/2006-12/msg00218.html (12,841 bytes)
73. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Bob Cunnings" <bob.cunnings@gmail.com>; Date: Sun, 10 Dec 2006 11:03:47 -0700; http://en.wikipedia.org/wiki/Wiener_filter is a good description of the system. <snip> _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contestin; /archives//html/TenTec/2006-12/msg00221.html (10,190 bytes)
74. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "n4dsp" <n4dsp@triad.rr.com>; Date: Sun, 10 Dec 2006 14:08:17 -0500; Thanks Bob!! Sure wish that link was put here days ago. That solved everyones problem and now we have understanding. 73 john-n4dsp _______________________________________________ TenTec mailing list; /archives//html/TenTec/2006-12/msg00222.html (10,054 bytes)
75. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Fri, 15 Dec 2006 16:19:13 -0600; NR works in a variety of ways, including using LMS or some other adaption algorithm to adapt the coefficients of an IIR or FIR filter, in the classic Wiener filter noise reduction algorithm. And the; /archives//html/TenTec/2006-12/msg00307.html (10,539 bytes)
76. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 15 Dec 2006 19:43:20 -0600; Something the ear and spectrum analyzer may show is the character of the attenuated noise. I'd expect an adaptive bandpass filter to have a considerable depth to the skirts and the noise left to be s; /archives//html/TenTec/2006-12/msg00310.html (11,652 bytes)
77. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Sat, 16 Dec 2006 08:32:48 -0600; It would depend on the number of filter taps, which drives delay and processing power requirments. Heck, it's even possible to have the number of taps be an adapted parameter (I don't think that's g; /archives//html/TenTec/2006-12/msg00321.html (9,870 bytes)
78. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sat, 16 Dec 2006 11:46:13 -0600; My point is that the residual noise from filtering will sound like the original noise but at a reduced level. The residual noise from autocorrelation doesn't sound like the noise that went in. Whethe; /archives//html/TenTec/2006-12/msg00325.html (10,562 bytes)

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