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Topic: CORDIC

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	Obituary: Bob Trow, Compatriot of Rege Cordic and 'Mister Rogers'
		Baby boomers got ready for school listening to Bob Trow, one of Rege Cordic's comic compatriots on the radio, while their children encountered him one generation and a technological leap later.
		Cordic, who is now retired and living on the West Coast, remembered Mr.
		It was 33 years ago this month that Cordic left KDKA for a job in Los Angeles and passed the morning baton to Mr.
	www.post-gazette.com /regionstate/19981103trow9.asp (1049 words)

	NationMaster - Encyclopedia: CORDIC
		The modern CORDIC algorithm was first described in 1959 by Jack E. Volder, although it is similar to techniques published by Henry Briggs as early as 1624.
		CORDIC is particularly well-suited for handheld calculators, an application for which cost (and therefore gate count on the chip) is much more important than is speed.
		This explanation shows how to use CORDIC in rotation mode to calculate sin and cos of an angle and assumes the wanted angle is given in radians and represented in a fixed point format.
	www.nationmaster.com /encyclopedia/CORDIC (1250 words)

	BASIC Stamp: CORDIC math
		The CORDIC method is attractive because it is an integer algorithm close to the hardware.
		The CORDIC method depends on the Givens rotation transform, which expresses the coordinates of a point P in two different coordinate systems, rotated by a certain angle about their common origin.
		A second trick, or insight, of CORDIC is that the value of cos H does not depend on the direction of rotation.
	www.emesystems.com /BS2mathC.htm (3270 words)

	Obituary: Rege Cordic: Popular Pittsburgh radio announcer in '40s, '50s, '60s
		Cordic, the host and ring-leader of the KDKA program and a legend in local radio, died of cancer Friday night in Los Angeles, where he had moved in 1966 to re-create his shtick for the southern California market.
		Cordic became well-known for his bit-acting in popular TV shows such as "Gunsmoke" and "Ironside" and for the baritone voice in countless commercials, but in Pittsburgh he will be forever known as a radio "personality" before the industry became saturated with them.
		Cordic was president of the bogus Academy of Commercial Arts and Sciences that awarded mythical "Semi-Emmy" statuettes the day after the Academy Awards to honor the best radio commercials of the year.
	www.post-gazette.com /regionstate/19990418cordic9.asp (1026 words)

	The CORDIC Algorithm
		In a nutshell, the CORDIC rotator performs a rotation using a series of specific incremental rotation angles selected so that each is performed by a shift and add operation.
		The CORDIC algorithm is a shift-add algorithm for computing trigonometric, hyperbolic trigonometric and linear functions and their inverses.
		The CORDIC FAQ at www.dsp-guru.com A different explanation that some may find easier to follow.
	www.andraka.com /cordic.htm (484 words)

	The CORDIC-Algorithm for Computing a Sine
		7] described the COordinate Rotation DIgital Computer or CORDIC for the calculation of trigonometric functions, multiplication, division and conversion between binary and mixed radix number systems.
		Following this incident, the CORDIC algorithm knows two ways of determining the direction of rotation: the rotation mode and the vectoring mode.
		With equation 1.14 the CORDIC algorithm in rotation mode is described completely.
	www.cnmat.berkeley.edu /~norbert/cordic/node4.html (396 words)

	The Dispatch - Serving the Lexington, NC - News (Site not responding. Last check: )
		Cordic was born in the Hazelwood neighborhood of Pittsburgh and attended Central Catholic High School.
		One of Cordic's most memorable running gags at both WWSW and KDKA were fake advertisements for "Olde Frothingslosh", "the pale stale ale with the foam on the bottom." The beer was supposedly brewed by Sir Reginald Frothingslosh at Upper Crudney-on-the-Thames.
		Cordic accepted the offer in July 1965, but KDKA owner Westinghouse Broadcasting Corporation refused to release Cordic from his contract until it ended in November 1965.
	www.the-dispatch.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Regis_Cordic (703 words)

	Cordic & Company Olde Frothingslosh Index Page (Site not responding. Last check: )
		Cordic appears with current and former KDKA personalities John Cigna and Jack Bogut in a segment focusing on the three men who have occupied the coveted KDKA morning-drive seat for 38 years.
		Cordic, who made his home in Sewickley in the '50s, looks back fondly on his years in his hometown.
		In 1965, Cordic headed to Los Angeles, where he replaced the late actor Bob Crane as a morning radio personality in the city.
	www.cordic-and-co.com /bios_etc/Rides.htm (401 words)

	Cordic & Company - Arthur Greenwald (Site not responding. Last check: )
		Cordic's pranks and promotions were legendary He established Brick Throwing as a sport, replete with fan rallies, a "Miss Brick" contest, and an official magazine, Thud.
		Still, Cordic never lost touch with Pittsburgh, For years he pretaped movie intros for WTAE-TV on whose AM station he reprised Cordic and Company in 1970, where as a high school student, I saw him work.
		Cordic's widow, Cathy, recalls with pride that he maintained his sense of humor through the worst of his illness.
	www.cordic-and-co.com /bios_etc/Greenwald.htm (502 words)

	CORDIC FAQ
		CORDIC is an iterative algorithm for calculating trig functions including sine, cosine, magnitude and phase.
		CORDIC revolves around the idea of "rotating" the phase of a complex number, by multiplying it by a succession of constant values.
		CORDIC algorithm inverse tangent by Frontier Design is provided in C, VHDL, and Verilog formats.
	www.dspguru.com /info/faqs/cordic2.htm (1696 words)

	Method and system for reuse of cordic in an rf transceiver by reconfiguration in real time patent invention
		The single input CORDIC may be configured to operate in a rotating mode and the single output CORDIC may be configured to operate in a rotating mode and/or an arctangent (ARCTAN) mode.
		A rotated output of the single input CORDIC may be correlated with a phase shift keying (PSK) synchronization (sync) word and a portion of the correlated rotated output of the single input CORDIC may be buffered.
		A peak detector may be adapted to determine a signal peak utilizing an amplitude output signal of the single output CORDIC, where the amplitude output signal may correspond to at least a portion of the correlated rotated output and a portion of the buffered correlated rotated output.
	www.freshpatents.com /Method-and-system-for-reuse-of-cordic-in-an-rf-transceiver-by-reconfiguration-in-real-time-dt20060504ptan20060093070.php (2436 words)

	Warwick: DCS: Reports and Theses
		The CORDIC algorithm for the calculation of trigonometric functions has traditionally suffered from two problems; speed, and the necessity to pre-scale the inputs.
		Here we show a new CORDIC system which has a unit scale factor that can be ignored.
		The unit scale factor is achieved by rotating the vector in 3 dimensional space in a manner which scales its projection onto the X-Y plane by the reciprocal of the overall scale factor.
	www.dcs.warwick.ac.uk /reports/234.html (215 words)

	cordic methods
		cordic methods describe essentially the same algorithm that with suitably chosen inputs can be used to calculate a whole range of scientific functions including; sin, cos, tan, arctan, arcsin, arccos, sinh, cosh, tanh, arctanh, log, exp, square root and even multiply and divide.
		you can select in the code whether to do the multiples and divides also by cordic means.
		if classic hp models used the same cordic approach, they must have had hyperbolic functionally internally but never put it on keyboard.
	www.voidware.com /cordic.htm (1392 words)

	Has the HP-49G been discontinued?
		CORDIC was suitable for log/trig functions on older/slow calcs because it wasn't that much more complex than division.
		If CORDIC shift/add methods did not exist, the whole history of the personal pocket scientific calculator, time of introdcution, time of mass marketing, the pricing curves, etc would be vastly different - meaning delayed several years.
		A problem with CORDIC is that the maximum precision is hard-coded (you can calculate at a lower precision using the same tables - see Sharp's switchable 10 or 20-digit precision Basic machines).
	www.hpmuseum.org /cgi-sys/cgiwrap/hpmuseum/archv009.cgi?read=25442 (2784 words)

	[No title]
		CORDIC error analysis I'll try to explain briefly my results in the field of CORDIC and CORDIC-like algorithms error analysis.
		The main source of the errors of CORDIC is ignoring of rightmost bits, when we shift X or Y to i positions to the right in every iteration if we don't have additional bits, i.e.
		For CORDIC algorithms shiftings are executing from 1 bit to n bits.
	www.sigda.org /Archives/NewsGroupArchives/comp.lsi/1995/Jun/comp.lsi.3094.txt (1965 words)

	CORDIC
		CORDIC (for COordinate Rotation DIgital Computer) is a simple and efficient algorithm to calculate hyperbolic and trigonometric functions.
		CORDIC was first described in 1959 by Jack E. Volder.
		To oversimplify somewhat, one begins by selecting a start angle from a small lookup table.
	www.xasa.com /wiki/en/wikipedia/c/co/cordic.html (171 words)

	CORDIC (Site not responding. Last check: )
		CORDIC is not typically used for microprocessors, rather it is a hardware
		It all depends on the microprocessor you are using.
		If you think about what CORDIC is doing, it is simply a phase angle rotator.
	www.dsprelated.com /showmessage/6779/1.php (1360 words)

	Cordic´s Automatic Taxi dispatch system
		Let Cordic put you on the path to success with the most advanced taxi dispatch system on the market.
		Ask any of our over 140 customers...they would agree that the purchase of a Cordic system is a step in the right direction.
		In the central, the job is automatically dispatched to the driver based upon your system setup or put on hold and brought to the attention of the dispatcher by a red flag indicating a Web Booking job.
	www.cordic.ch /taxisystemen.htm (635 words)

	DSP DesignLine \| Tutorial: Software implementation of Trigonometric Functions using CORDIC Algorithm
		The error in CORDIC is split to different factors as approximation error and truncation error (Equation 1).
		A Sine wave of 21 samples with input frequency 50 Hz and sampling frequency of 4000 Hz is generated using Ideal CORDIC and the implemented CORDIC.
		The X axis represents the input angle which is normalized and the Y axis represents the approximation and the truncation error.
	www.dspdesignline.com /howto/showArticle.jhtml?articleID=196700838 (1771 words)

	Electronic Forum - Questions about guard bits in CORDIC algorithm (Site not responding. Last check: )
		I have learned about CORDIC from this group, especially from Ray.
		One paper described the implement structure of CORDIC algorithm.
		CORDIC paper, which I think you have probably seen.
	www.electrothree.com /detail-2793832.html (707 words)

	[No title] (Site not responding. Last check: )
		Keywords: Fractal Cordic Integer Math Elementary Functions Sender: news@u.washington.edu (USENET News System) Organization: University of Washington, Seattle Date: Thu, 17 Sep 1992 22:49:50 GMT Lines: 345 I've had around fifteen requests for my papers on implementing a fractal program so I'm just going to repost them.
		Cordic Math 1.0d1 by Jesse Jones INTRODUCTION This file discusses a fast algorithm for calculating the elementary functions using cordic math.
		"Expanding the Range of Convergence of the Cordic Algorithm." Outlines an efficient method for extending the range of the Cordic routines so that arguments don't have to be reduced.
	spanky.triumf.ca /pub/fractals/docs/CORDIC.MATH (861 words)

	Dr. Dobb's \| Software Implementation of Trigonometric Functions Using CORDIC Algorithm \| December 19, 2006
		The Cordic rotator rotates the input vector to angle Z
		The error in CORDIC is split to different factors as approximation error and truncation error (Equation 1).
		The X axis represents the input angle which is normalized and the Y axis represents the approximation and the truncation error.
	www.ddj.com /196700769?_requestid=423934 (1780 words)

	OPENCORES.ORG
		Confluence is a simple, yet highly expressive language that compiles into Verilog, VHDL, and C. See www.confluent.org for more info.
		Cordics (COordinate Rotation DIgital Computers) perform arbitrary phase rotations of complex vectors and are often used to calculate trigonometric functions and vector magnitudes.
		The pipeline latency equals 2 clock cycles plus the number of cordic stages.
	www.opencores.org /projects.cgi/web/cf_cordic (103 words)

	The CORDIC Algorithm
		We give an introduction to the CORDIC method used my most handheld calculators (such as the ones by Texas Instruments and Hewlett-Packard) to approximate the standard transcendental functions.
		The CORDIC algorithm does not use Calculus based methods such as polynomial or rational function approximation.
		Subsequently, the CORDIC scheme was extended by J.
	www.math.utep.edu /Faculty/helmut/presentations/1997/cordic/wcordic.html (180 words)

	Square-root CORDIC
		We explained the CORDIC basics for trig-functions earlier.
		Multiplying and dividing may be reduced to additions and substractions.
		To compute a square-root with CORDIC the number is yielded by multiplying, adding and testing.
	www.restena.lu /convict/Jeunes/Math/square_root_CORDIC.htm (338 words)

	WFMU's Beware of the Blog: 365 Days #92 - Rege Cordic Mr. Sargent - Sounds of Ground Breaking (mp3)
		Rege Cordic was THE morning show radio host to listen to in Pittsburgh in the 50's and 60's with his Cordic and Company show.
		Through images and sound effects, Cordic created the illusion of a theater with a studio audience and the station regularly received ticket requests.
		I was 12 at the time and well remember poems that Cordic would offer in the morning dedicated to the previous night's game.
	blog.wfmu.org /freeform/2007/04/365_days_92_reg.html (810 words)

	RFEL IP Cores- Cordic
		The RFEL CORDIC (Co-Ordinate Rotation Digital Computer) core provides the means to extract magnitude and phase information from an I&Q data stream, or to provide Sine/Cosine conversion of an input angle vector.
		These parameters can be specified by the customer or optimised by RFEL to meet accuracy specifications.
		CORDIC gain compensation can be built in if required.
	www.rfel.com /products/Products_cordic.asp (195 words)

	H.O. Beer Cars - Rege Cordic
		Rege Cordic created the Olde Frothingslosh name for his Pittsburgh radio show in the 1950s.
		Rege's personal collection of Olde Frothingslosh cars are displayed here alongside the cars created by the Car Shoppes at Forest City with the gracious permission of the Cordic family and Ric Collins.
		All of these images are copyrighted materials, and shall not be copied or distributed further without the express written permission of their respective owners.
	www.hobeercars.com /manufacturers/cordic.html (246 words)

	CORDIC algorithms (Site not responding. Last check: )
		The CORDIC (= COordinate Rotation DIgital Computer) algorithm was developped by Jack E. Volder in 1959.
		Subsequently, the CORDIC scheme was extended by J. Walther in 1971 to other transcendental functions.
		A pretty straightforward port to Oberon of the original C code published in Dr. Dobb's Journal, Issue ddj9010.
	www.oberon.ethz.ch /software/CORDIC.html (118 words)

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