Election of Tone Control Parameters-See Page MAR(H 1953
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Selection of Tone Control Parameters-See Page MAR(H 1953 E !\i G 1 I%l E E IR 1%l G çianre+fl ^ Str;pe www.americanradiohistory.com / here are the 30 BEST SELLING RECORDS OF 1952* ... and over 43% used adiotapr' for the original sound! Like Audiodiscs and Audiotape, this record speaks Made from Audiodisc for itself. Record, Artist S Label Master Of the thirty top hit records of the year, all but BLUE TANGO (Leroy Anderson- Deeea) WHEEL OF FORTUNE (Kay Starr-Capitol) Y. one were made from Audiodisc masters! And that CRY (Johnnie R y -Okeh) Y. one - a London Record - was made abroad. YOU BELONG TO ME (Jo Stafford -Columbia) AUF WIEDERSEH'N, SWEETHEART (Vera Lynn -London) It is significant, too, that the original recordings I WENT TO YOUR WEDDING (Patti Page- Mercury) HALF AS MUCH ( Rosemary Clooney- Columbia) for over 43 per cent of these records were first made WISH YOU WERE HERE (Eddie Fisher - DugO II'in tech alter- Victor) on Audiotape, then transferred to the master discs. HERE IN MY HEART (.41 Martino -BBS) This marks a growing trend toward the use of DELICADO (Percy Faith -Columbia) Audiotape for the original sound in the manufac- KISS OF FIRE (Georgia Gibbs - Mercury) ANY TIME (Eddie Fisher -Hugo Wiaterhalter- Victor) ture of fine phonograph records. TELL ME WHY (Four Aces -Decca) BLACKSMITH BLUES (Ella Mae Morse- Capitol) Yes - Audiodiscs and Audiotape are truly a IAMBALAYA (Jo Stafford- Columbia) record- making BOTCHAME (Rosemary Clooney- Columbia) combination -in a field where there GUY IS A GUY (Doris Day -Columbia) can be no compromise with Quality! LITTLE WHITE CLOUD THAT CRIED (Johnnie Ray- Okeh1 Trade Mark HIGH NOON (F'rankie Laine- Columbia) t I'M YOURS (Eddie Fisher -Hugo Winterhalter- Victor) GLOW WORM (.Mille Brothers -Decca) IT'S IN THE BOOK (Johnny Standley- Capitol) SLOW POKE (Pre ITS' Ki,ny- Victor) WALKIN' MY BABY BACK HOME (Johnnie Ray -Columbia) MEET MR. CALLAGHAN (Les l'aul- Capitol) I'M YOURS (Don Cornell- Coral) I'LL WALK ALONE (Don Cornea - Coral) TELL ME WHY (Eddie Fisher-Hugo Winterhalter- Victor) TRYING (llilltoppers -Dot) PLEASE, MR. SUN (Johnnie Ray - Columbia) AUDIO DEVICES, INC. l r turning to Retail Sales, as listed in THE BILLBOARD. 444 MADISON AVE., NEW YORK 22, N. Y Export Dept.: 11 East 40th St., New York 14, N. Y., Cables "ARLAS's Audiodiscs are manufactured in the U.S.A. under esderiys license from PYRAL, S.A.R.L., Parir www.americanradiohistory.com Successor to 1917 1 ,7c7 -Established AUDIO INCLUDING > PHYSICISTS EPVGIIIEERING; AND ENGINEERS C. G. McProud, Editor and Publisher Harrie K. Richardson, Associate Editor Ec gar M. Villchur, Contributing Editor ATTENDING THE Eve Drolet, Product on Manager Henry A. Schober, Business Manager Edgar E. Newman, Circulation Promotion S. L. Cahn, Advertising Director Elizabeth Beebee, C rculation Manager H. N. Reizes, Advertising Manager Editorial Advisory Bcard Representatives CONVENTION H. Thorpe Covington Special Representative NEW YORK CITY Howard A. Chinn 677 N. Michigan Ave.. Chicago 11, Ill. z3 lohn D. Calvin Sanford R. Cowan, Mid -West Representative MARCH -26... 67 W. 44th St., New York 18, N. Y. C. I. LeBel I. P. Maxfield West Coast lames C. Calloway J. W. Harbison Inquiries are George M. Nixon 816 W. 5th St., Los Angeles 17, Calif. invited regarding CONTENTS MARCH, 1953 Vol. 37, No. 3 openings Audio Patents -Richard H. Dorf 2 on our Staff Letters 8 Employment Register 10 RADAR LABORATORIES New Literature 12 GUIDED MISSILE LABORATORIES Audio Photographer's Checklist -Eugene F. Coricil 14 ADVANCED ELECTRONIC LABORATORIES Effect of Load Impedance on Magnetic Pickup Response -Norman Pickering 19 ELECTRON TUBE LABORATORIES A Power Tubé Figure of Merit -Warren G. Bender 21 FIELD ENGINEERING DEPARTMENT The Selection of Tone -Control Parameters -Edgar M. l'illchur 22 Audio in the Year 1693 -Allen H. Fry 25 For the convenience of Auxiliary or Emergency Broadcast Control Room- Harold Reed 26 > those attending the I. R.E. The Columbia "360"-Peter C. Goldmark 28 meetings and Radio Engineering Theater in Sound A Small Package -Part 2- Thomas R. Hughes 30 Show, members of the Handbook of Sound Reproduction-Chapter 10 -Edgar M. I'illehur 32 Laboratory Ste will be available 1953 Radio Engineering Show 38 for interviews at the First Inventor Under the 1952 Patent Law- Albert If'oodruff Gray 40 Convention hotel. For appointment telephone Hughes New York Audio Fair -Los Angeles Rated Huge Success 42 office, LAckawanna 4 -935o. Equipment Report- Pilottnler and Pilotone Amplifier 44 Record Revue- Er:yard Taman Canby 46 New Products 54 Errata 55 Industry People 71 Advertising Index 72 HUGHES COVER Recording voice on previously made film by means of magnetic sound track is becoming increasingly important in radio and TV. Reeves Soundcraft's Magnestripe process is being demonstrated RESEARCH AND by Georgia Landeau, DEVELOPMENT LABORATORIES NBC -TV featured actress. At the left is shown the RCA Model 400 projector which reproduces both optical and magnetic Scientific and sound tracks, and which incorporates a recording Engineering Staff amplifier for use with the Magnestripe process. CULVER CITY, LOS ANGELES COUNTY, CALIFORNIA RADIO MAGAZINES, INC., P. 0. BOX 629, MINEOLA, N. Y. Assurance is reàuired that relocation AUDIO ENGINEERING (title registered of the applicant will not cause disruption II. S. Pat. OIT.) is published monthly at 10 McGovern Avenue, Lancaster, Pa. by Radio Magazines. Henry Inc.. A. Schober, President; C. B. McProud, Secretary. Executive and Editorial Offices: of an urgent military project. 204 Front St., Mineola. N. Y. Subscription rates -United States, U. S. Possessions and Canada. $3.00 for 1 year, $5.00 for 2 years; elsewhere $9.00 per year. Single copies 35c. Printed in U. S. A. All rights reserved. Entire contents copyright 1953 by Radio Magazines, Inc. Entered as Second Class Matter Februay 9, 1950. at the Post Once. Lan- caster, Pa. under the Act of March 3, 1879 AUDIO ENGINEERING MARCH, 1953 1 www.americanradiohistory.com ISS umitez RICHARD H. DORF I SEEMS that it is time once again to really good thinking and problem repeat a definition given a long time ago solving. This column is a review rather ::f the purpose of these monthly patent than a normal article, selecting as many articles. The thought arises because among interesting (to the writer, anyway) patents your letters sometimes appears one pointing as space allows and turning the abstruse out that for this and that technical reason patent -specification language into technical SONOCRAFT one of the patents described here is not English. We make every effort to either all it is cracked up to be, as far as per- reject or plainly label patent ideas that are FM TUNER formance is concerned. truly unworkable, but -paraphrasing the Now, don't get me wrong : such letters common radio parlance-the opinions ex- America's Most Advanced Tuner are as welcome as other mail. They show pressed are almost entirely those of the knowledge and astuteness on the part of the inventors. COMPARED ... by engineers and writers, and they often give additional While on the subject of mail, here is an critical music - lovers for audio-quality. food for thought. But sometimes they say answer for those who would like circuit and technical advancements. Consen- in effect (often between rather than on the component values in all the schematics. sus of comment: "Amazing tonal qual- lines) that since the deficiency is present Whenever the patent furnishes them, we ity" ... "True fidelity of reproduc- we ought not to describe the patent. And put them there in plain sight. If we haven't tion" ... "Live programs really sound there's the point of disagreement. done so, they aren't available. live!" These articles are different from most And now, on to this month's review. and found con- others. They don't purport to give ab- M sistently e ective for fringe-area re- solutely reliable information right from the Distortion ement ception at distances from 40 to 80 writer's or other engineer's mouth ; they Owen E. DeLange's patent No. 2,618,686 miles from New York City ... New, don't mean to imply that the inventions de- shows a visual method of distortion meas- super- sensitive circuit assures perfect scribed are either good or bad; they don't urement using the outphasing principle. signal pick up with sufficient quieting even indicate that the inventions will The purpose (probably used in wideband for excellent reception even in remote positively work. What they try to do is amplifiers-the patent is assigned to Bell locations. Automatic Frequency Con- present ideas that seem interesting for any Labs) is to check distortion in terms of trol (AFC) prevents station drift. of dozens of reasons -because the approach compression or expansion- nonlinearity- to a problem is new or ingenious (or both), rather than in terms of harmonic produc- . because of its because there is an idea that could be de- superior per ormance, its compact tion, though the two are, of course, rigidly veloped further, because the invention shows related. The method is simple, requiring no dimensions for easy mounting into a somewhat different- though not neces- any enclosure, its new type precision equipment, and is shown in block almost sarily better -way of doing a common tuning indicator (simpler to use) and form in Fig. 1. thing, because, although the object of the The principle is to generate a wave of many other exclusive features .. invention may be unnecessary or impracti- definite form, such as a sawtooth, and feed * * * cal, somebody did put together a weird it through the system under test. The wave SPECIFICATIONS: New black -out tun- brainstorm of a circuit, parts of which is simultaneously fed through a "balancing ing indicator; 3 gang inductive tun- might give someone an idea that would be branch." The waves from the two branches ing; dual limiter; all coils slug -tuned; practical, and so on.