Tascam da 98 hr brochure

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DA-98HR Technical Documentation 7733 Telegraph R oad - Montebello , CA 90640 - (323) 726-0303 - http://www .tascam.comAll features and specifications are subject to change without notice. C\ ontact y our local TASCAM representativ e for the latest information. Page 2 of 4DA -98HR_TECHDOC.pdf 091900 DTRS HISTORY Ever since the introduction of the DA -88 in 1992, users of all levels ha ve been using D TRS machines to create, mix, and transfer their tr acks at home and between studios. The DTRS standard has become renowned for top qualit y sound, top notch reliability, and the fastest tr ansport and machine lock in the business. The DA-88but since it w as so full featured, it also found its w ay into major television and motion picture studios. The D TRS format has long been the standard format to move audiofrom one studio to the next, due to the affordable nature of the machine and media, as well as the high audio qualit y. In addition, a number of studios ha ve been using DA -88s to expand their tr ack count by having the DA -88 chase analog machines, or other digital formats. With the the DTRS machines added some new features lik e a digital patchbay, test tone oscillators, and an ev en faster transport than the original DA -88. Still, the DA-88 had made such an indelible mark on the industry that it's production was continued b y popular demand into the year 2000. The DA -78HRof its heritage, continuing the tr aditions established andattested to over the y ears at a new standard - 24 bit. All in all,the most flexibilit y, and tried and true reliabilit y that has been proven for almost a decade. THE 24 BIT ACHIEVEMENT BACKWARDS COMPATIBILITY When the 24 bit D TRS format was announced, most userswere curious about how we did it. 24 bit audio requires 50% more data than the original 16 bit format, y et theDA-78HR didn't cut back on tr acks or record time. Manyassumed that the 24 bit format would ha ve been lessreliable since more information is written in a smaller space. W ell, actually the 24 bit format is ev en morereliable. Here's why: Whenwriting a bunch of ones and z eros on a piece of paper. Allthe data passes through an encoder and decoder (codec) when going to and coming from tape. The coding processutilizes a lossless algorithm allowing a larger amount of data to be stored in the same amount of space. The original D TRS 8-10 Modulation Principle used b y most all DAT recorders. This format has been around for almost two decades; more efficient encoding schemes ha ve been dev eloped over time. High Length Limited) codec commonly used in hard driv e and DVD technologies. This format is 66% more space efficient than the codec used in the original DTRS machines. Since only 50% more data was needed to store the audio itself , the other 16% was dedicated to additional data v erification beyond the original D TRS machine. So, the 24The write area is actually about the same siz e. The 24 bit machine utilizes a better codec which offers more efficient use of the space, as well as increased reliabilit y through more accurate data verification processes. When the high resolution machines were designed, theability to work with the original 16 bit machines lik e DA-38s, DA -88s, and DA -98s was a high priorit y. Sync ChainHigh resolution D TRS machines use the same D TRSSync line that the previous machines used. So , you can lock an y combination of 16 bit machines with24 bit machines sample accur ately in 2 seconds or less. Audio I/OThe new high resolution DTRS machines use the sameDB25 plugs for balanced audio , and TDIF lines for transfers and integr ation into digital studios. This means if you are trading out 16 bit machines for 24 bitmachines, there are no new cabling requirements. Tape FormatThe DA-98HR can read and write 16 bit format tapes,allowing HR users to seamlessly work with owners ofolder DTRS machines. Howev er, 24 bit tapes created on a high resolution D TRS machine will only work on other high resolution D TRS machines. Time Code TrackIn addition to the 8 tracks of audio, DTRS machines can handle two separ ate time tracks in subcode of thetape. One of the tr acks is the tape's absolute time, and the other is an independent SMPTE time code track. The high resolution D TRS machines can readand write this SMPTE time code tr ack in both 16 bit and 24 bit format, so you can continue working thesame way y ou are used to working. TASCAM's DA-88, the original DTRS format recorder