Digitally audio Tape

R-DAT Kassette
R-DAT cartridge


Digitally the audio Tape (DAT) is a digital audio - tape.

To table of contents

history

DAT 1987 by the DAT conference one developed. Two procedures were developed: R-DAT,on the market, and S-DAT finally came. R-DAT should serve cartridge as separation of the Compact. Actually there was a time to buy long a small selection of taped DATs in the trade. However the format of that became internationally Federation OF the Phonographic industryfrom fear of Piraterie fights. With million-complaints one threatened to the potential DAT importers in America already at that time. For this reason DAT within the Consumer range could not reach a break-through. Within the professional range DAT was however well established unexpectedly. Owing to its reliability became DAT of HP also asBasis for the DDS - format for data protection uses.

technology

quality and comfort are clearly increased opposite similar tape recorders. With a Samplingfrequenz of up to 96 kHz and a dissolution of maximally 24 bits the Klangpotenzial is higher than that that CD.

R-DAT-Rekorder (R for rotary Head) uses like a predecessor video home system an azimuth - recording methods. Both heads have 6° inclination. The volume of the R-DAT is a dataclose metallic powder volume. On it additionally to the audio signal also still Subcodes are noted, which contain manufacturer-specific codes or data to individual TRACKscan. A TRACK on a DAT volume can be found reliable similarly as with that audio CD over the starting markings also in the fast browsing. Further jump and trailer labels can be set to be able or the tape end „before-shift to jump over around certain parts of an admission simply “.

The volume is in a cartridge protected keeps. As is the case for the video recorder the volume is pulled of the mechanics out of the cartridge housing and transported - in form one „on the head “ standing omegas - around the heads. The Umschlingungswinkel amounts to usually thereby 90°. Thus the clay/tone becomesin finite segments, which are clearly longer than the volume broadly, noted and read. The actual tape feed speed amounts to 8.15 mm per second (contrary to 47,5 mm/s with the Compact cartridge). By the head drum rotating with 2000 rpm (usually with 30 mm in diameter) becomesa relative volume speed of 313 cm/s reaches.

Per minute the recording needs scarcely a half meter tape material. At standard volume speed are possible depending upon reel length play time from 15 to 180 minutes. Of the use of volumes with more than 60 m and of thatThe manufacturers advise use of DDS volumes against (digital DATA STORAGE), even if thereby up to 11,5 hours of recording (DDS5-Band) in the Longplay mode are possible. Longplay doubles these values, whereas photographs with double Samplingfrequenz (96 kHz) halve the play time. The cartridge is taped only in a direction.

Playing and recording equipment („DAT recorders “) were originally only appropriate for a Samplingfrequenz of 48 kHz. Devices of the second generation made possible also the admission with a scanning rate of 44.1 kHz around a digital 1:1 - copy of CD to manufacture. Such devices had however in Europe and the USAequipped with the copy protection Serial CoPy management system (SCMS ) its. Further Samplingfrequenzen is depending upon equipment 32 kHz, with which also Longplay - photographs are possible (for duplication of the play time with a decrease of the dissolution of bit of 16 to 12 bits with not-equidistant quantization) as well as 96 kHz forhigh-quality home and Studiogeräte. Longplay and „High resolution “- photographs are not compatible however with each equipment.

In study-uppercalibrate gives it also devices, which work with a dissolution of 24 bits. In addition these have XLR connections instead of the RCA connections usual with Home Hifi (also as Cinchdesignated), whereby they are only with difficulty into existing plants integrable off a Studios. Likewise AES/EBU digital connections are used. Many Studiogeräte permit a setting of the SCMS - to bits and an announcement of the read errors. These normally lie within the range of 0-50 errors per second; according to a manual ofPanasonic are normal values under 300. Over it either the head is dirty dirty, worn or however the band control adjusted - which with devices of Sony the case is particularly frequent. For the related DDS devices one head drum life span is indicated to one by 100.000-200.000 hours, therefore should thoseHead drum a life remain long received.

As only construction unit are to be changed with directly operated Rekodern brake felt in regular intervals (annual). Some spring elements about every 10 years, affected by it are mostly devices with Panasonic drive assemblies (Panasonic, technology, Tascam, Pioneer, Onkyo, Studer uvm.) with thatnot directly propelled models, most Consumergeräte of Sony particularly in the lower price segment, are susceptible additionally still various belts, clutches and other mechanically loaded parts to defects and should be controlled likewise regularly. As with each Hifikomponente are in the power packs electrolytic capacitors blocked, those oftento drain and to malfunctionings, in the worst case to irreparable damage, lead can. In addition some transistors are too badly cooled, which at the latest after few hours an enterprise becomes apparent (Aussetzter, reeling problems). Of it often many Consumergeräte are concerned, in addition, some older Studiorekorder of Sony.

sees also

Web on the left of

 

  > German to English > de.wikipedia.org (Machine translated into English)