About: Azimuth recording

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Azimuth recording is the use of a variation in angle between two recording heads that are recording data so close together on magnetic tape that crosstalk would otherwise likely occur. Normally, the head is perpendicular to the movement of the tape, and this is considered zero degrees. However, if the heads are mounted at slightly different angles (such as ±7 degrees in VHS), destructive interference will occur at high frequencies when reading data recorded in the cross-talking channel but not in the channel that is intended to be read. At low frequencies relative to the maximum allowed by the head gap, however, this technique is ineffective. Thus one head is slanted slightly leftwards and the magnetic gap of the other head slanted slightly rightwards.

Attributes	Values
rdf:type	yago:WikicatComputerStorageTapeMedia yago:Abstraction100002137 yago:Company108058098 yago:Group100031264 yago:Institution108053576 yago:Organization108008335 yago:YagoLegalActor yago:YagoLegalActorGeo yago:YagoPermanentlyLocatedEntity yago:SocialGroup107950920
rdfs:label	Azimuth recording (en)
rdfs:comment	Azimuth recording is the use of a variation in angle between two recording heads that are recording data so close together on magnetic tape that crosstalk would otherwise likely occur. Normally, the head is perpendicular to the movement of the tape, and this is considered zero degrees. However, if the heads are mounted at slightly different angles (such as ±7 degrees in VHS), destructive interference will occur at high frequencies when reading data recorded in the cross-talking channel but not in the channel that is intended to be read. At low frequencies relative to the maximum allowed by the head gap, however, this technique is ineffective. Thus one head is slanted slightly leftwards and the magnetic gap of the other head slanted slightly rightwards. (en)
dcterms:subject	Computer storage tape media
Wikipage page ID	2394460 (xsd:integer)
Wikipage revision ID	967102010 (xsd:integer)
Link from a Wikipage to another Wikipage	Symmetric Phase Recording Betamax VHS VTR Noise (electronics) Crosstalk Magnetic tape Tape head U-matic Helical scan Computer storage tape media VCR Low-pass Destructive interference
Link from a Wikipage to an external page	http://journal.smpte.org/content/95/3/301.abstract http://media.canon-asia.com/products/digitalCamcorder/pal-xlh1s/xlh1s_a.pdf http://www.mrbetamax.com/AzimuthRecording.htm https://books.google.com/books%3Fid=8uLEXlN9ouAC&pg=PA570&lpg=PA570&dq=Azimuth+recording&source=bl&ots=P3_FfdWUhv&sig=b1QCQIfIUdxwoSWAdsGlETcnh5A&hl=en&sa=X&ei=IOdLT8zbKOSSiQK34InbDQ&ved=0CGQQ6AEwCTgK%23v=onepage&q=Azimuth%20recording&f=false https://books.google.com/books%3Fid=VRailj6TKqUC&pg=PA302&lpg=PA302&dq=Azimuth+recording&source=bl&ots=z3MGxOs74T&sig=p4vBlVRj390l0HyWCvfGAN-Tia0&hl=en&sa=X&ei=PedLT9vOG4ePiAK1zIXbDQ&ved=0CEUQ6AEwBjgU%23v=onepage&q=Azimuth%20recording&f=false http://www.google.com/patents/US4897748
sameAs	Azimuth recording Azimuth recording Azimuth recording Azimuth recording
dbp:wikiPageUsesTemplate	dbt:Short_description dbt:Typo_help_inline dbt:Video_storage_formats dbt:Electronics-stub
date	November 2019 (en)
reason	similar to heast (en)
has abstract	Azimuth recording is the use of a variation in angle between two recording heads that are recording data so close together on magnetic tape that crosstalk would otherwise likely occur. Normally, the head is perpendicular to the movement of the tape, and this is considered zero degrees. However, if the heads are mounted at slightly different angles (such as ±7 degrees in VHS), destructive interference will occur at high frequencies when reading data recorded in the cross-talking channel but not in the channel that is intended to be read. At low frequencies relative to the maximum allowed by the head gap, however, this technique is ineffective. Thus one head is slanted slightly leftwards and the magnetic gap of the other head slanted slightly rightwards. To look at it another way, channel A sees the channel B data stretched out in time, hence the technique has a low-pass effect on noise intruding from another channel. Every videotape system was designed to put as much video as possible onto a given-sized tape, but information from one recording track (pass of the video head) must not interfere with information on adjacent stripes. Using slant azimuth recording, the need for guard bands, that is the blank space between tracks, is eliminated, allowing more recording to be placed on a given length of tape. All the early low-end reel-to-reel VTR machines and the first VCR cassette formats, the Philips and the Sony U-matic, used this system. Later, the JVC VHS and the Sony Betamax used slant azimuth recording also. These digital VTR versions used azimuth recording as well. (en)
gold:hypernym	Use
prov:wasDerivedFrom	wikipedia-en:Azimuth_recording?oldid=967102010&ns=0
page length (characters) of wiki page	3401 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Azimuth_recording
is Link from a Wikipage to another Wikipage of	Symmetric Phase Recording Betamax Blinded by the Light VHS Azimuth Shingled magnetic recording Type B videotape
is foaf:primaryTopic of	wikipedia-en:Azimuth_recording

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