|This is the talk page for discussing improvements to the Tape recorder article.|
|WikiProject Professional sound production||(Rated C-class, High-importance)|
|The content of Magnetic tape sound recording was merged into Tape recorder. That page now redirects here. For the contribution history and old versions of the redirected page, please see ; for the discussion at that location, see its talk page. (2013-04-17)|
Fixed head vs. rotary head recorders
I can't find anywhere in Wikipedia where there is a distinction between rotating head recorders and fixed head recorders. Am I missing it? -Willmcw 07:38, 18 Dec 2004 (UTC)
- There is a lot more about the rotating head technology at helical scan. Graham 22:28, 19 Dec 2004 (UTC)
- Thanks, that's exactaly what I was looking for. Cheers -Willmcw 02:42, 20 Dec 2004 (UTC)
History of tape recording
Is there an article about the history of tape recording? When was the first tape recorder patented? When were they first sild commercially? SteveH 12:30, 4 October 2006 (UTC)
- The first tape recorder was developed in Germany by AEG around 1935. See articles on Bing Crosby and Magnetophon for material on the history that should be included here. --Blainster 04:54, 30 November 2006 (UTC)
Image was removed
[[Image:Tape recorder kinematics.jpg|thumb|450px|The construction of the 1970s single motor tape recorder.<br> 1 - lever, moving the pressing wheel; <br> 2 - rubber covered wheel, to press the tape to the leading wheel;<br> 3 - flywheel (stabilises the tape traction speed);<br> 4 - lover axis holder;<br> 5 - leading wheel (determines the tape traction speed);<br> 6 - spring;<br> 7 - detail, pressing the tape to the magnetic heads; <br> 8 - intermediate wheel; <br> 9 - electronical motor (one for both playing and tape rewinding); <br> 10 - rewind activation control; <br> 11 - 15 - tape traction speed selector; <br> 16, 34 - cloth - covered surface to create the friction force, preserving the constant tension of the tape (stronger friction is required on the tape accepting side); <br> 17, 30 - bottom side of the tape holder, rotates with the constant speed; <br> 18, 32 - top side of the tape holder, rotation speed depends from the remaining amount of the tape; <br> 19 - 22, 25, 28, 35 - belt gear to rotate the tape holders at reduced speed; <br> 23 - erasing magnetic head; <br> 24 - spring; <br> 26 - brake; <br> 21, 27, 31 - tape directors; <br> 29 - the universal magnetic head, used both for playing and recording;<br> 33 - pusher to apply the brakes; <br> 36, 37 - additional levers; <br> 38 - operating controls.]]
maybe it should be included that the tape recorder is used as an instrument/to create effects in music like Dub —Preceding unsigned comment added by 188.8.131.52 (talk) 14:17, 25 September 2007 (UTC)
This is factually inaccurate: "Higher speeds used in professional recorders are prone to cause "head bumps," which are fluctuations in low-frequency response."
It's perfectly correct, though with modern equipment it's not an issue. Early tape machines had very large heads, often 2 inches across: at 30 inches/second the wavelength of low frequencies becomes comparable to the head size, with the result that at some frequencies the magnetic field tends to go round the head casing rather than the gap. As this varies with frequency the result is an uneven bass response ('bass woodles'). Modern heads are very much smaller and no-one was using 30 ips for some years even before digital replaced analogue tape, so the situation didn't arise.
User:OscarJuan is Oscar Bonello in real life. He is a professor from Argentina who has done research in the field of tape recorders. He has recently been trying to have his work mentioned in Wikipedia. There was some discussion of this at Talk:Magnetic tape sound recording#latin american contribution. I've reverted his edit on this article for the same reasons as before. He has a clear conflict of interest and the edits are not especially relevant to the subject. -- Austin Murphy (talk) 15:49, 19 May 2008 (UTC)
- Ah, I see. It's unfortunate that those with the most access to images and research notes are the ones which would be in conflict of interest (WP:COI). Binksternet (talk) 16:54, 19 May 2008 (UTC)
The article skips from Alexander Graham Bell's paper tape recorder to wire recorders, and that's a huge technological leap. It also could use a bit more detail about the development of the BASF/AEG tape recorder, the first such machine that is comparable to present-day tape recorders. A few bits of information, partly from memory, that need to be researched and referenced:
- The tape base was cellulose acetate plastic. It was thin and flexible, but also somewhat brittle. The technology was already in use as a base for motion picture film, except in a thicker version. Due to this fragility issue, the material was abandoned by the mid-1960s after DuPont developed Mylar in the 1950s.
- The tape recorder's immediate predecessor, the wire recorder, had relatively low fidelity reproduction, comparable to telephone. Even the earliest AEG recorders had astoundingly good sound, which, on AM radios of the day, was virtually indistinguishable from a live broadcast.
- Adolf Hitler made considerable use of the new technology, recording public addresses which were played back later over radio broadcasts. This reportedly confounded the Allies, as they could pick up these broadcasts and, knowing the locations of various broadcast transmitters, got the impression that Hitler was appearing in different locations in Germany such that he would have to travel at extreme speed to do so. The riddle wasn't solved until after the World War II, when the tape recording technology became available to the western Allies.
- There's no mention of the development of the use of an AC bias signal in recording. Development of high fidelity recording on tape would have been absolutely impossible without it. (AC biasing was discovered by William L. Carson and T. W. Carpenter under the sponsorship of the U.S. Navy, and they received U.S. Patent 1,640,881 for their invention in 1927.) Prior to that, wire recorders used DC biasing and, later, AC biasing, but due to the characteristics of the recording medium, it was not possible to produce high fidelity recordings, and print-through was a big problem.
- Some of the earliest commercial audio tape recorders were produced by Ampex Corporation in the United States in 1948. The earlier German AEG Magnetophon machines were not made available to the mass market.
- Entertainer Bing Crosby became an early investor in Ampex when an associate of his at Bing Crosby Enterprises witnessed a demonstration of a Magnetophon tape recorder in 1947. Ampex tape recorders ended up being used by the thousands in the broadcast, audio recording and movie industries, and ownership in Ampex increased Crosby's personal wealth considerably.
One source for historical information is Magnetic Recording, by Charles E. Lowman (McGraw-Hill, 1972. ISBN 0-07-038845-8), although he makes no mention of the BASF/AEG connection, possibly due to embarrassment over the technology having been expropriated from its German inventors as spoils of war. (Lowman was Manager, Instrumentation Technical Writing for the Ampex Corporation and Senior Instructor, Ampex Training Department, at the time he wrote the book.)—QuicksilverT @ 23:41, 24 May 2010 (UTC)
- A related article is Magnetic tape data storage. Similar principles at work. Binksternet (talk) 16:21, 9 December 2012 (UTC)
Done -—Kvng 21:34, 17 April 2013 (UTC)
Steel tape paragraph was incorrect
There were serious errors in the paragraph about Steel tape. the Blattnerphone came first. The first one was installed in Broadcasting House in 1930 with a second shortly after, and new and improved versions in 1932. The Marconi-Stille, which addressed many of the technical problems the Blattnerphone suffered from, was first installed at Maida Vale in March 1935; though gradually superceded by disk and optical film the Marconi-Stilles continued in use until the late 1940s.
I have re-written this section using information from 'BBC Engineering 1922-1972' by Edward Pawley, plus some from colleagues who worked in Broadcasting House in the 1930s. RFWilmut (talk) 22:12, 23 August 2013 (UTC)
- Thanks for the corrections and contributions. I've trimmed it a little to insure the it is WP:VERIFYABLE. ~KvnG 15:37, 1 September 2013 (UTC)
Thanks for the amendments. I've added a section on recording at the BBC and some photos. Because there are no non-copyright (in the USA) photos of the Blatterphone and other early machines I've included links to external pages which includes photos - I hope this is OK. RFWilmut (talk) 12:02, 8 September 2013 (UTC)