Tascam RC-898 owner manual ABS setting, Return-to-zero, Selecting Time Mode

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Section 6.4 - ABS setting

3) When the tape is at the time you want to make the “zero” point, press the CAPTURE key [29].

The current time value from the first DTRS unit will be displayed on the LOCATE TIME/VALUE display [15].

4) Press the STR key [17].

The MEMORY NO. display [14] will start to flash.

5)Press the numeric keypad’s 0 key, and then press the ENTER/LOAD key [20] to enter the current time into the 00 location memory.

The TAPE TIME display will now show 00:00:00:00, showing that it is now at zero, relative to the time you have just captured.

If the display shows something other than 00:00:00:00, this means that the tape is now at a position other than the point where you captured the time (i.e. the tape was playing or recording).

All times now are relative to this time. Any loca- tions will now be shown on the TAPE TIME dis- play relative to the new 00 memory. For example, if the relative “zero point” is set to 00:30:00:00, when the tape is at the absolute location of 00:45:00:00, the value shown on the TAPE TIME display will be 00:15:00:00 (45 – 30). However, even though the value shown on the TAPE TIME display changes, neither the actual tape position nor values shown on the LOCATE TIME/VALUE display are affected.

Absolute settings

00:00:00:00 00:45:00:00

Relative settings

00:00:00:00

00:15:00:00

.00:30:00:00

New

TAPE TIME display

 

 

“zero”

 

 

 

point

 

 

 

 

 

 

 

 

 

A minus value is shown on the displays either with a leading minus sign (–) on the TAPE TIME display, or with a leading period (.) on the LOCATE TIME/VALUE display.

6.3.1 “Return-to-zero”

Since the RC-898 works on time-based, rather than counter-based, references, there is no dedi- cated “RTZ” control. However, you can return to the zero point using the following procedure:

1) Press the RCL key [18].

The MEMORY NO. indicator will start to flash.

2)Press the 0 key on the numeric keypad, followed by ENTER/LOAD.

The LOCATE TIME/VALUE display will now show the actual time value of the “zero point”.

3) Press the LOC key [41].

The tape will return to the nominal “zero point” and the TAPE TIME display will show

00:00:00:00.

6.4 ABS setting

The ABS setting allows you to use the subcode on the servo track of the DTRS unit as the time refer- ence of the RC-898. Usually, this starts at 00:00:00:00, and continues for the length of the tape.

However, there are some options available with the ABS mode, which increase the flexibility of the system. These are described in 8.1.2, “Synthe- sizing timecode from ABS times”, and allow you to start with an offset, etc. when synsthesizing timecode.

6.4.1 A note on ABS frame rate

When ABS is selected, the number of frames per second is different from that in any timecode mode. For details of setting SMPTE/EBU frame rates, see 8.1.3, “Selecting a timecode type”.

Timecode (whether SMPTE or EBU) contains a fixed number of frames per second. However, the ABS method of timing works in a slightly differ- ent way.

In three seconds of time, there are 100 frames. These frames are allocated as follows:

Second

Number of

Maximum frame

frames

value displayed

 

00 – 01

33

32

01 – 02

33

32

02 – 03

34

33

This pattern is repeated every three seconds, as you will notice when you set frame values using the menu system in ABS mode. When multiple DTRS units are connected together in DTRS sync mode, the master unit always outputs ABS tim- ings to the slave unit(s).

6.4.2 Selecting Time Mode

9888 Each DTRS unit in the chain capable of using timecode (i.e. DA-98 and DA-88/SY-88 units) can be changed to use either timecode or ABS timing.

6-2

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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 cablesReference clock in a digital studio AccessoriesAccessories 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 Crossfade times Performing the punch recording Setting pre-roll and post-roll timesRehearsing 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 typeChecking the generator progress Recording the timecode on a Dtrs timecode trackRewind 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 downPark position Fast LTCMidi Timecode output Play the master unit Individual recording status while chasing timecodeVideo resolve D e o R e s o l v e C h i n e O f f E e Advanced timecode functions Controlling GPI devices External control and settingsControlling the parallel port device 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 emulationMMC ID Fast wind speedCue-up tally D I / B u s I D C h i n e C e i v e Other Dtrs control functions Menu group Menu and parameter reference Menu groupsMenu groups 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 itemsSpecifications SpecificationsDimensions 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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