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Kurzweil DMT interface User Manual Download Page 40

DMTi

40

Here is a simplified schematic showing one KDS output signal pair:

Here is a simplified schematic showing one KDS cable signal pair:

Here is a simplified schematic showing one KDS input signal pair:

AM26LS32B

Mini D-15

Male

68pF
5%
NPO

Coilcraft
DLF8000

KDS Rec

110
Ohms

68pF
5%
NPO

Coilcraft
DLF8000

AM26LS31

Mini D-15

Female

KDS Xmit

Mini D-15

Male

Mini D-15

Female

Summary of Contents for DMT interface

Page 1: ...n with no consistency in the result The reason for this is that the AES EBU digital audio standard and its offshoot the consumer or S PDIF standard has no provisions for externally clocking the sample...

Page 2: ...ck either to a sample rate determined by one of the other incoming audio signals to the rate set by incoming word clock or to a rate set by the DMTi s internal clock Whichever sample rate clock is cho...

Page 3: ...Out DMTi signal flow About This Manual This manual starts with a description of all features and controls After that we will discuss specific applications of the DMTi in a variety of scenarios Read th...

Page 4: ...ght channel digital output bus known as the Kurzweil Digital Stream from a Kurzweil 2500 series instrument which is equipped with a KDS digital input output or KDFX digital effects option It uses a 15...

Page 5: ...accepts sample rate or word clock from an external source such as a digital audio system with separate word clock signal or a synchronizer The word clock signal is a square wave with a frequency of be...

Page 6: ...ctor with the AES optical connectors On the DA 88 TDIF 1 option the DB 25 connector serves as both input and output Note All of the audio outputs are in parallel and all are live all the time Therefor...

Page 7: ...ng section consists of the four Destination knobs which set up the routing of the signals Each knob is associated with a particular output pair it determines which input pair will be routed to the kno...

Page 8: ...e active the XLR input or the optical input The switch does not change the signal format of the input the XLR input can be used either with Professional or Consumer S PDIF sources while the optical in...

Page 9: ...ape deck Consequently the cable that is supplied with the deck for this purpose can be used with the DMTi a 25 pin connector for the DA 88 and two optical connectors and two DB 9 sync connectors for A...

Page 10: ...p problems to a minimum The signal at the AES EBU outputs however is at the higher level required by AES EBU devices and it is possible although unlikely that the input on an S PDIF device could be da...

Page 11: ...DMTi provides the proper signal conversions and also provides proper sync for recording on the digital multitrack What you need The K2500 must be equipped with a KDS digital input output or KDFX digi...

Page 12: ...external clock master you can set Clock Select to WDCLK Note that any time you are not using the MDM as the clock master you must make sure the multitrack tape deck is set to sync to an external clock...

Page 13: ...S 2 MDM AES 1 Int 44 1K Int 48K WDCLK M D T ulti igital DMT Output Format Pro Cnsmr Pro Cnsmr Output Format Destination 1 Destination 1 Destination 2 Destination 3 Destination 4 Destination 2 4 KDS In...

Page 14: ...o vided with the recorder for connecting two decks together DA 88 format decks use a single 25 pin D connector while ADAT format decks use one optical and one sync cable for input and a similar pair f...

Page 15: ...6 AES 2 D C B AES 1 Source utput Sync Clock Select 1 2 3 4 5 6 AES 2 O AES 2 MDM AES 1 Int 44 1K Int 48K WDCLK M D T ulti igital DMT Output Format Pro Cnsmr Pro Cnsmr Output Format Destination 1 Dest...

Page 16: ...d the DMTi s KDS In connector Connect AES EBU cables from the DMTi s outputs to the inputs you want to use Settings Set the Destination knobs for all of the pairs that you are using to one of the KDS...

Page 17: ...AES EBU device back to its own input or you will create a feedback loop Variation 2 K2500 to S PDIF Common S PDIF devices include DAT decks computer sound cards and signal processors They may have opt...

Page 18: ...eed The K2500 must be equipped with the Sampling option and the KDS digital input output option or KDFX digital effects option Use a KDS cable included with the DMTi to connect the K2500 to the DMTi A...

Page 19: ...S 2 O AES 2 MDM AES 1 Int 44 1K Int 48K WDCLK M D T ulti igital DMT Output Format Pro Cnsmr Pro Cnsmr Output Format Destination 1 Destination 1 Destination 2 Destination 3 Destination 4 Destination 2...

Page 20: ...o use You may want to record using Pro Tools sample rate clock as the master in which case you have two options 1 connect a BNC to BNC coaxial cable from Pro Tools word clock output to the DMTi s Word...

Page 21: ...D C B AES 1 1 2 3 4 5 6 AES 2 D C B AES 1 Source utput Sync Clock Select 1 2 3 4 5 6 AES 2 O AES 2 MDM AES 1 Int 44 1K Int 48K WDCLK M D T ulti igital DMT Output Format Pro Cnsmr Pro Cnsmr Output For...

Page 22: ...er to the DMTi using the cable s provided with the recorder for connecting two decks together one 25 pin D cable for a DA 88 one optical and one sync cable for an ADAT s input and a similar pair for o...

Page 23: ...ADAT users If you are using multiple ADAT units then one ADAT must act as sync master for all of the others as well as for any DMTi that is feeding signals to any of the decks The sync signal is carri...

Page 24: ...be more than one slave and then use standard audio cables to connect the timecode out jack of the master device to the timecode in jack s of the slave s or if the devices use MIDI Time Code use a MID...

Page 25: ...put connect the recording deck to any AES output If locking the output to an external source of sample rate clock connect that signal to the Word Clock input Settings Set the Destination knobs to rout...

Page 26: ...he mixer should be set up to lock to external sample rate clock What you need The DMTi must have an ADAT or DA 88 TDIF 1 option AES EBU XLR AES EBU to S PDIF or optical cables Word clock cables if you...

Page 27: ...cks to a multitrack digital tape that already has one or more tracks recorded on it then the MDM must be the sync master set Clock Select to MDM There is an exception to this rule if you are using an...

Page 28: ...tal recorder see Page 13 What you need AES EBU XLR AES EBU to S PDIF or optical cables If you are using a K2500 series instrument as one of the sources it must be equipped with a KDS digital input out...

Page 29: ...the fly and this can create errors If for some reason Pro Tools must be the master clock the solution is simple run a BNC to BNC cable from Pro Tools word clock output to the DMTi s Word Clock Input a...

Page 30: ...s MDM jack using the 25 conductor cable provided with the recorder for connecting two decks together Determine which deck is the source deck playback and which is the destination deck record Connect a...

Page 31: ...r P 7 8 KDS MDM A KDS D AES 1 C B outing R 1 2 3 4 AES 2 5 6 Source D C B AES 1 KDS MDM AES 4 MDM 7 8 KDS D AES 3 MDM 5 6 KDS C MDM 7 8 A KDS 7 8 MDM KDS A 7 8 Source 1 2 3 4 5 6 Source AES 2 D C B AE...

Page 32: ...e same time that it records the audio or you can pre stripe the tape in the destination deck with SMPTE making sure the numbers are compatible with the timecode on the source tape With either method y...

Page 33: ...g to the device connected to the DMTi s output If there is no sound coming from the AES1 input make sure the Input Select switch is set correctly Intermittent audio This can be caused by clock problem...

Page 34: ...rying to combine two digital streams that are out of sync or when trying to convert a digital stream on the fly The DMTi deals with out of sync streams but if you are sending data from the DMTi to a d...

Page 35: ...deck off the clock will go off but the DMTi will continue trying to convert incoming signals with unfortunate results Pitch changes These can occur when the wrong sample rate is chosen for a device E...

Page 36: ...f If this jumper is in one position then when the Clock Select switch is set to WDCLK the DMTi syncs to the signal coming into the Word Clock Input on the back panel in other words normal operation If...

Page 37: ...ng the data The eight channels are arranged as follows There are four stereo outputs A B C and D The outputs are produced received in the order A Left Chan 0 B Left Chan 1 C Left Chan 2 D Left Chan 3...

Page 38: ...d Data are typically produced by flip flops within the same device to minimize skew The same can be said for the differ ential transmitters and receivers used at each end of the cable KDS Sync and KDS...

Page 39: ...features guaranteed minimum hysteresis and skew plus a much improved output driver Measured at the output of the receiver the time difference between any KDS signal transition to any other signal tra...

Page 40: ...implified schematic showing one KDS cable signal pair Here is a simplified schematic showing one KDS input signal pair AM26LS32B Mini D 15 Male 68pF 5 NPO Coilcraft DLF8000 KDS Rec 110 Ohms 68pF 5 NPO...

Page 41: ...sions requirements The Tokin chokes have separate cores for each twisted pair as opposed to the Coilcraft part that uses one core for all four pairs Each output signal should have a 68pF NPO 5 capacit...

Page 42: ...ucing common mode voltage at the receiver The standard KDS interface cables are fabricated with four pair low capaci tance cable Belden 9806 or equivalent consisting of four unshielded twisted pairs w...

Page 43: ...Range 48 65 Hz Power Consumption 1 0 amp 120V nominal Fuse 0 25 amp fast blow Environmental Temperature Operating 41 to 104 F 5 to 40 C Temperature Storage 13 to 186 F 25 to 85 C Relative Humidity Op...

Page 44: ...ubleshooting 33 W Word clock 5 Word Clock Out 6 K K2500 operating system 2 K2500 Series 2 KDFX Option 2 KDS AC Specifications 39 KDS Cabling and Connectors 41 KDS DC Specifications 38 KDS Implementati...

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