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41. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Fri, 8 Dec 2006 01:18:56 -0500; Duane, Oh yes indeed there are. I've used many forms of Digital Signal Processing in my earlier work, other than for noise reduction. I am though limiting the discussion HERE to noise reduction, beca; /archives//html/TenTec/2006-12/msg00135.html (16,251 bytes)
42. Re: [TenTec] Noise Reduction Setting (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Thu, 07 Dec 2006 20:24:46 -1000; It's news to me that SAWs are processors. I would be more inclined to believe that a SAW filter may be used in front of some type of dsp processor. Last time I read about Surface Acoustic Wave device; /archives//html/TenTec/2006-12/msg00136.html (9,308 bytes)
43. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 08 Dec 2006 01:43:59 -0600; SAW devices can do the autocorrelation process. Might be two input transducers, at different distances from the output transducer. The distance chosen to put a preferred frequency in phase, but noise; /archives//html/TenTec/2006-12/msg00137.html (10,413 bytes)
44. [TenTec] Noise Reduction Setting (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 08 Dec 2006 06:43:18 -0500; N5QT: but if SNR doesn't improve, you will have quiet nice quite copy of nothing! (e.g, 1.371, 1.372, 1.373b5 Orion). They were all the same. There may be other characteristics driving someone to pre; /archives//html/TenTec/2006-12/msg00138.html (9,881 bytes)
45. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Barry Gross" <barry.n1eu@gmail.com>; Date: Fri, 8 Dec 2006 12:05:20 +0000; Gary, the Orion uses a dedicated Analog Devices SHARC dsp chip. On the 81917_5 schematic it is denoted as AD21056L (ADSP-21065?). There's a Motorola Dragon Ball cpu to handle general processing. 73,; /archives//html/TenTec/2006-12/msg00139.html (8,903 bytes)
46. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Fri, 8 Dec 2006 09:31:32 -0600; By "other tasks" I was referring to other DSP tasks, not GP computing tasks. The DSP processors have a LOT of work to do. Grant/NQ5T _______________________________________________ TenTec mailing li; /archives//html/TenTec/2006-12/msg00140.html (9,316 bytes)
47. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Fri, 8 Dec 2006 09:36:35 -0600; In the v1 Orion it is most definitely the case. It's clearly observable on a spectrum analyser, and isn't just the "analog thinking" of a newbie. This is as much "true DSP noise reduction" as any ot; /archives//html/TenTec/2006-12/msg00141.html (9,458 bytes)
48. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Fri, 8 Dec 2006 09:38:39 -0600; This IS becoming a semi-annual thing isn't it. :-) It isn't just the topic, it's almost literally the same discussion. I'd call it déjà vu, but it's more than just the "spooky feeling"; /archives//html/TenTec/2006-12/msg00142.html (8,775 bytes)
49. Re: [TenTec] Noise Reduction Setting (score: 1): Author: Jeff Sumner <jdos2@mindspring.com>; Date: Fri, 8 Dec 2006 10:47:23 -0500; "Facts?" I've heard of them in stories, and in song! KC4FOX _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tent; /archives//html/TenTec/2006-12/msg00143.html (8,404 bytes)
50. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 08 Dec 2006 11:32:14 -0600; While the effect on the output spectrum is that of a bandpass filter, I don't think NR works that way. I think it works on correlation of the pass band with a time delayed copy of the pass band. When; /archives//html/TenTec/2006-12/msg00147.html (10,944 bytes)
51. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Merle Bone" <merlebone@charter.net>; Date: Fri, 8 Dec 2006 17:58:16 -0600; Jerry said: "While the effect on the output spectrum is that of a bandpass filter, I don't think NR works that way. I think it works on correlation of the pass band with a time delayed copy of the pa; /archives//html/TenTec/2006-12/msg00156.html (8,391 bytes)
52. Re: [TenTec] Noise Reduction Setting (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Fri, 08 Dec 2006 20:06:01 -0600; While I'm not an expert at DSP, I know some time series tricks (time series analysis is the basis for DSP) and I know some of the statistics behind the time series analysis. Good DSP is the efficient; /archives//html/TenTec/2006-12/msg00158.html (10,181 bytes)
53. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Fri, 8 Dec 2006 22:08:42 -0500; Yes, what was explained at the bottom is about right. We did not have to have adaptive filters in the applications I used, because the signal environment was always somewhat a given. But you could ad; /archives//html/TenTec/2006-12/msg00159.html (12,308 bytes)
54. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Fri, 8 Dec 2006 22:12:19 -0500; Excellent News :) of which not _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec; /archives//html/TenTec/2006-12/msg00160.html (10,671 bytes)
55. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Fri, 8 Dec 2006 22:20:59 -0500; Grant, I should be much more careful in defining my terms. That way I would be less likely to make confusing remarks ! When you say that bandwidth reduction (by whatever means) is a true form of nois; /archives//html/TenTec/2006-12/msg00161.html (11,962 bytes)
56. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Fri, 8 Dec 2006 22:28:40 -0500; Indeed yes, all correct. This is one of the "other" methods I had in mind when I wrote one of my earlier posts. And narrow bandwidth makes the job of separating "good" signals from "bad" signals more; /archives//html/TenTec/2006-12/msg00166.html (13,354 bytes)
57. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 08 Dec 2006 22:53:02 -0600; Yes the working autocorrelator has an output spectrum a lot like a narrow bandpass filter with flat skirts not all that far down. The noise reduction depends on the noise being truly random (which is; /archives//html/TenTec/2006-12/msg00168.html (12,155 bytes)
58. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 08 Dec 2006 23:13:40 -0600; Primarily because the books I've read on noise reduction tend to emphasize autocorrelation as the technique with the main variations being the selection of the time delay and judging the results to a; /archives//html/TenTec/2006-12/msg00169.html (11,639 bytes)
59. Re: [TenTec] Noise Reduction Setting (score: 1): Author: Lin Davis <linbdavis@earthlink.net>; Date: Sat, 09 Dec 2006 00:57:58 -0500; 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 was an "Adaptive Predictor with Leaky LMS"; an autocorrelation filter.; /archives//html/TenTec/2006-12/msg00170.html (13,928 bytes)
60. Re: [TenTec] Noise Reduction Setting (score: 1): Author: "Grant Youngman" <nq5t@tx.rr.com>; Date: Sat, 9 Dec 2006 09:34:43 -0600; Actually, not necessarily. Autocorrelation (and also the cross correlation matrix) IS used in one form or another in establishing the error term between the de-noising filter's output and the desire; /archives//html/TenTec/2006-12/msg00186.html (11,931 bytes)

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