Loop bin duplicator: Difference between revisions

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A '''loop bin duplicator''' is a specialized [[audio tape]] machine used in the duplication of pre-recorded [[compact audio cassette|audio cassettes]]. and [[8-track tape|8-track cartridges]].

Digital loop bin duplicators were first introduced in the early 1990s. They had fewer moving parts than previous systems, so were more reliable to operate.

[[File:Magnefax_Duplicator.jpg|thumb|right|Magnefax 7in duplicator]]

== Analog Looploop Binbin Duplicatorduplicator ==

An analog loop bin uses a long loop of either 1/2" wide (for cassette duplication) or 1" wide (for 8-track tape duplication) loaded in a large bin located in the front of the machine,duplicator. which This loop master tape is readloaded into the duplicator's bin from a traditional open-reel of tape, where the program material has been recorded to it using a studio-type multitrack tape recorder in real-time beforehand. The loop tape for cassette duplication has 4 tracks on boththe sidesloop bin master tape (2 stereo tracks for Side A recorded in one direction, and the other 2 for Side B recorded in the opposite direction), and for 8-tracks has all of the 8 tracks (4 2-track stereo programs) recorded in one direction. The loop-bin master tape is read by the duplicator at a very high speed. For cassettes, either 32, 64, 80, or 100 times the normal speed of playback (1.875 [[inches per second|ips]]) of an audio cassette (60, 120, 150, and 187.5 ips respectively) is used, and 10 or 20 times the normal speed of playback (3.75 ips) is used for 8-track duplication (37.50 and 75 ips respectively).

While this loop is being played back, the audio signals for the A and B side (or all 4 programs for 8-track) are sent to a "slave" recorder or an audio bus that contains multiple "slaves". The "slave" records from the Aloop andbin Bmaster sidetape tothe a4 reeltracks offor rawboth 1/8"A audioand tapeB woundsides onto aan open-faced "pancake" reel (similar to [[film|motion picture film]] wound on a plastic core) of raw 1/8" audio tape (for cassettes), or all 8 tape tracks to back-lubricated 1/4" audio tape (for 8-track cartridges) also wound on a "pancake" reel, at the same high speed. After it is recorded, this pancake of tape is then loaded onto special machines called loaders. TheFor cassettes, the loader has cassette shells containing only a leader called "C-0" cassettes that are loaded one at a time or into a hopper where the C-0s are fed automatically depending on the type of loader. The tape from the pancake is then spliced onto the C-0 cassette's leader and then wound into the cassette by the loader. For 8-tracks, the tape is wound from the slave recorder onto a device mounted on its side, called a "sidewinder", which holds several small reels, and extracts and winds the tape from the slave recorder onto each reel into an endless-loop configuration (with the tape being pulled from the center of the wind), where each full reel is then placed in an empty 8-track cartridge and spliced together, either by machine or by hand, with a foil splice that holds the loop together. The foil splice also serves to automatically engage an 8-track player to advance to the next program when played.

The 1/2" loop of tape in the duplicator's bin usually will have a segment of clear leader spliced in between the beginning and end of the programtape loop (with some duplicators using a metal foil splice instead). This clear leader splice is read by an optical sensor (or in the case of a foil splice, coming in contact with electrical contacts in the tape path) in the loop bin duplicator, which triggers a cue tone that is recorded to the reel of 1/8" pancake tape. This cue tone tellsis read by the loader, and engages it, for cassettes, to stop and cut the tape from the pancake and either splice it to the other length of leader in the C-0 cassette shell, or for 8-tracks, to disengage winding to an internal cartridge reel on the "sidewinder" mechanism and then cut the tape (a process for both types of media called "de-spooling"), with the winding resuming to a new reel afterwards. In fact, part of this de-spooling tone (also known as a "tailor tone" or "trigger tone") can be heard at the leader splice or foil splice of some previously recorded audio cassettes and 8-tracks respectively, as a very low-frequency [[arpeggio|arpeggiated]] rumbling of about 20 Hertz, sounding similar to how [[Motorboating (electronics)|"motorboating"]] sounds with a radio or audio amplifier affected by such, but as an actual higher-frequency tone when played back at a higher speed (as it was when recorded to the tape at high speed during duplication).

In the [[XDR (audio)|XDR]] duplication process for audio cassettes, the loop bin duplicators use 1"-wide loop tape instead (like what is used for 8-track duplication), yielding in a better quality duplication.

== Digital loop bin duplicator ==

Digital loop bins were also introduced in the early 1990s. The early digital loop bins replaced the source tape with audio data stored on [[hard drive]]s that was read and sent to [[digital-to-analog converter]]s that were connected to the "slave" recorders, but they were prone to failure because of the amount of stress put on the hard disks.

The hard disks were replaced by huge [[RAM]] [[buffer (computer science)|buffer]]s which eliminated the failures but added greatly to the expense of the equipment. Since a digital bin was capable of playback speeds of 256:1 or better, a single bin could perform as two by splitting the buffer between two different programs. A program could be loaded and looped for production while an additional program could be loaded into the buffer. A real-time monitoring system could play back the audio stored in either buffer to check for potential flaws in the audio while both programs were looping for production.

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==External links==

* [http://www.audiodups.com/manufacturing.html Bin Loop Tape Duplication (With pictures)]

* [https://web.archive.org/web/20030318000601/http://www.opticaldisc-systems.com/2002MarApr/Equipment64.htm Digital Bin Loop Master Machine]

* {{usurped|1=[https://web.archive.org/web/20101208122537/http://www.8trackheaven.com/ampex.html "My year at Ampex", by Ron Schauer, a former employee at Ampex's tape duplication plant]}}

==References==

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[[Category:Audio storage]]

[[Category:Electronics]]

[[Category:Equipment]]

[[Category:Audio electronics]]

{{improve categories|date=August 2015}}