Tascam RC-898 Synchronization of timecode, Pull up and pull down, Error bypass, Rechase mode

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Section 8.2 - Advanced timecode functions

1)From menu group 5, move the cursor to OutTc Src and press SELECT:

O u t p u t T C S o u r c e

M a c h i n e 1

1)From menu group 8, move the cursor to Fs Shift and press SELECT:

F s S h i f t M o d e

M a c h i n e 1

T a p e ( T C T r a c k )

o f f

2)Use the UP and DOWN keys to select between the four options available:

TAPE (TC

Outputs the timecode as recorded on

Track)

the dedicated timecode track.

 

 

TAPE

Outputs the timecode as synthesized

(ABS)

from the ABS subcode, with all off-

 

sets, etc. as set up in 8.1.2, “Synthe-

 

sizing timecode from ABS times”.

 

 

External

Timecode received at the timecode

(reGen)

input is regenerated and output.

 

 

External

Timecode received at the timecode

(reshape)

input is filtered and retransmitted.

 

 

8.2.2 Synchronization of timecode

88When timecode (including MTC) is output from a DTRS unit, it may be synchronized to either the analog or digital outputs, depending on which is in used at the time. This is necessary because of the nature of the digital-to-analog cir- cuitry employed in the DTRS units.

1)From menu group5, move the cursor to OutTc Tmg, and press SELECT:

O u t p u t

T C

T i m i n g

 

D i g i t a l » » » » »

»

A n a l o g

 

 

 

M a c h i n e 1

2 3 4 5 6

 

 

 

 

 

2)Use the UP and DOWN keys to select either digital or analog synchronization for the output timecode.

8.2.3 Pull up and pull down

When using DTRS units in NTSC telecine situa- tions, it may be necessary to adjust the sampling frequency fractionally, as the NTSC frame rate of

29.97and the cinema frame rate of 24 do not form a neat mathematical ratio.

The sampling frequencies of 44.1kHz and 48kHz are therefore affected when the material is trans- ferred back to film.

Accordingly, the pull up and pull down functions are provided to allow the adjustment of sampling frequencies to drop-frame environments.

2)Use the UP and DOWN keys to select one of the following settings:

off

Pull Down 30NDF Pull Up 29.97NDF Pull Up29.97DF

98Pull Down 30DF

If this setting is anything other than off on one or more DTRS unit, the PULL UP/DN indicator

[10]of the RC-898 will light when the appropriate machine is selected, as will the indicator on the DTRS unit(s).

NOTE

If you want to use the Fs Shift function, make sure that the reference clock is set to Video or Int (see 7.2.6, “Clock selection”). If the reference clock is Word,

although the setting can be made, the Fs Shift func-

tion will not be enabled.

8.2.4 Error bypass

When a DTRS unit is chasing timecode from an external source, the source timecode may drop out for a few frames or be otherwise discontinuous. To allow for this, a “flywheel” facility is provided, which allows the DTRS unit to continue for a set period until timecode is received again. The fly- wheel period may be set for either 10 frames or 30 frames, in the following way:

1) From menu group 4, move the cursor to ErrByPass and press SELECT:

E r r o r B y p a s s

 

M a c h i n e

1

1 0 F r a m e

2)Use the UP and DOWN keys to select between 10 and 30 frames for the “flywheel” period.

8.2.5 Rechase mode

98The DA-98 provides another facility which is used when chasing to timecode.

8-6

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Contents RC-898 For U.S.A Table of Contents Introduction RC-898 featuresConnections Menu and basic operationsTable of Contents Making settings on the Dtrs units External control and settingsTimecode functions Menu and parameter referenceKey features Key featuresIntroduction UnpackingPrecautions and recommendations Precautions and recommendationsBattery backup Digital audio cablesAccessories AccessoriesReference clock in a digital studio Accessories RC-898 features Front panel Machine number indicators Through 6, E1, E2 Lock Status indicatorsVari indicators Time Mode indicatorsPreset key Data INC/DEC key and indicatorRepeat key and indicator Front panel ENTER/LOAD keyRear Panel Rear Panel DIP switches 1 ContrastConnections Connection to Dtrs unitsConnection to Dtrs units Machine IDsConnections parallel units Connections RS-422 UnitsConnections parallel units Connections GPI event unitsMemory and batteries Memory and batteriesMemory and batteries Menu and basic operations NavigationNavigation Invalid operationsResetting values to zero Fast setting of valuesSetting values using the Value display Data entrySelecting the unit controlled by the menus Commonly-used menusStoring and recalling user setups Storing and recalling user setupsRecalling menus using the function keys Saving the current setupRecalling a user setup or restoring factory settings Storing and recalling user setups Basic Dtrs operations Transport controlsSelecting the unit to which operations refer Formatting tapesShuttle mode MonitoringMonitoring Arming tracksShuttle monitoring Shuttle mutingMonitoring Monitoring flowchart Monitoring Monitoring tables DA-88 and DA-38Monitoring Setting the precision Setting a relative time referenceLocation functions Reference modesABS setting ABS settingSelecting Time Mode Return-to-zeroSetting the location pre-roll value Location operationsLocation operations Auto playManual entry of a location point Editing a locationStoring the location in a memory Recalling a location memoryRepeating a section Repeating a sectionRepeated entry of location points Editing a location memoryPunch operations Rehearsing the punch recording Setting pre-roll and post-roll timesCrossfade times Performing the punch recording Punch operations Making settings on the Dtrs units Track delayTrack operations Track operationsKey Mode Unit-related functionsUnit-related functions Rec Mute functionChasing with an offset Auto Offset functionChecking the offset Clock selectionOutput timing From menu group E, move the cursor to eitherVarispeed pitch control Input selectionWord length DitherUnit-related functions Confidence mode Reference levelsMeter modes Sine oscillatorN e O s c i l l a t o r C h i n e Unit-related functions Timecode functions Primary timecode functionsPrimary timecode functions Selecting the timecode sourceSetting the generator start time Selecting a timecode type Checking the generator progress Recording the timecode on a Dtrs timecode track Rewind the tape to the beginning Start the timecode sourceChasing to external timecode Chasing with a timecode offsetIndependent clock settings Advanced timecode functionsAdvanced timecode functions Auto Timecode Offset functionError bypass Rechase modeSynchronization of timecode Pull up and pull downMidi Timecode output Fast LTCPark position Video resolve Individual recording status while chasing timecodePlay the master unit D e o R e s o l v e C h i n e O f f E e Advanced timecode functions Controlling the parallel port device External control and settingsControlling GPI devices Controlling the serial port 9-pin Controlling the serial port 9-pinSelecting the serial port device Location pre-roll on the serial unitSplit mode on the serial unit Serial unit timing sourceControlling recording operations on the serial unit Use the UP and Down keys to select between Split and NormalOther Dtrs control functions Other Dtrs control functionsChoosing a control protocol Track mapping functionsRecording delay Timecode track mappingRemote track arming Device emulationCue-up tally Fast wind speedMMC ID D I / B u s I D C h i n e C e i v e Other Dtrs control functions Menu groups Menu and parameter reference Menu groupsMenu group GPI Time value to Timecode type Output All parameters On, off 7, Midi Time Fast wind mode Menu group a Menu group EMenu group F Alphabetical list of menu items Alphabetical list of menu itemsDimensions SpecificationsSpecifications Dimensions Index A-E DtrsIndex F-O ABS 6-2,8-2Index P-T Index U-Z Generator 8-1,8-2,10-5,10-6RC-898
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