Tascam RC-898 owner manual Varispeed pitch control, Input selection, Word length, Dither

Page 43

Section 7.2 - Unit-related functions

2)Use the LEFT and RIGHT keys to select a unit, and the UP and DOWN keys to change the setting between Digital and Analog.

See p15 and pp25-26 of the DA-88 manual for fur- ther information regarding this facility.

7.2.8 Varispeed (pitch control)

The DTRS design allows for ±6.0% speed control, in 0.1% increments.

1)From menu group 0, move the cursor to Vari Spd, and press SELECT:

V a r i S p e e d

 

 

 

M a c h i n e

1

 

F i x

+

0 .

0 %

 

 

 

 

2)Use the UP key to change Fix to Vari, or the DOWN key to change Vari to Fix.

The VARI indicator [10] will light if Vari is selected, even if the setting is 0.0%, and will go out if Fix is selected, even if the setting is not zero.

3)Move the cursor to the right (numeric) field, and use the UP and DOWN keys to set the value.

NOTE

The varispeed function is only available if the unit clock has been set to internal (see 7.2.6, “Clock selection”) and the video resolve function (see 8.2.10, “Video resolve” ) is off.

7.2.9 Input selection

DTRS units can accept either digital or analog inputs. The choice of which inputs are to be used for each machine is made in the following way:

1)From menu group 9, move the cursor to InputSel and press SELECT:

I n p u t S e l e c t

 

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 between the digital and analog input sources for each unit.

In the screen above, units 1 through 4 are accept- ing analog signals, while 5 and 6 are using TDIF - 1 digital inputs.

7.2.10 Word length

3898 The DA-38 and DA-98 units are able to accept digital data at their digital I/O connectors at either 16-bit, 20-bit or 24-bit word lengths. These settings are made in the following way:

1)From menu group 2, move the cursor to Word Len, and press SELECT:

T D I F W o r d

L e n g t h

M a c h i n e 1

1 6

b i t

 

 

2)Use the UP and DOWN keys to select between 16, 20 and 24 bit word length of incoming data, which will be converted to 16 bits for recording purposes.

If you select a value higher than 16, you may want to experiment with the Dither settings (see 7.2.11, “Dither”, below), as this may help with dis- tortion, though a little may be lost from the signal- to-noise ratio.

7.2.11 Dither

3898 Dithering, in digital audio, is the tech- nique of adding a known noise signal to a low- level input signal, especially when converting from a word length with a higher number of bits than the destination (see 7.2.10, “Word length” above).

Paradoxically, this technique removes quantiza- tion noise and improves overall distortion figures, though at the slight expense of the signal-to-noise ratio. The DA-38 implements an “on/off” dither function, and the DA-98 allows two “shapes” of dither. See section 4-8 of the DA-38 manual or

8.13 of the DA-98 manual for further details.

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

D i t h e r

M a c h i n e 1

o f f

2)Allowable values for DA-38 units are on and off. The DA-98 allows the following settings to be made: off, triangular and

rectangular.

See the section 8.13 of the DA-98 manual for a discussion of rectangular vs. triangular dither modes.

7-5

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Contents RC-898 For U.S.A Menu and basic operations Table of Contents IntroductionRC-898 features ConnectionsMenu and parameter reference Table of Contents Making settings on the Dtrs unitsExternal control and settings Timecode functionsUnpacking Key featuresKey features IntroductionDigital audio cables Precautions and recommendationsPrecautions and recommendations Battery backupAccessories AccessoriesReference clock in a digital studio Accessories RC-898 features Front panel Time Mode indicators Machine number indicators Through 6, E1, E2Lock Status indicators Vari indicatorsFront panel ENTER/LOAD key Preset keyData INC/DEC key and indicator Repeat key and indicatorRear Panel Contrast Rear Panel DIP switches 1Machine IDs ConnectionsConnection to Dtrs units Connection to Dtrs unitsConnections GPI event units Connections parallel unitsConnections RS-422 Units Connections parallel unitsMemory and batteries Memory and batteriesMemory and batteries Invalid operations Menu and basic operationsNavigation NavigationData entry Resetting values to zeroFast setting of values Setting values using the Value displayCommonly-used menus Selecting the unit controlled by the menusSaving the current setup Storing and recalling user setupsStoring and recalling user setups Recalling menus using the function keysRecalling a user setup or restoring factory settings Storing and recalling user setups Formatting tapes Basic Dtrs operationsTransport controls Selecting the unit to which operations referArming tracks Shuttle modeMonitoring MonitoringShuttle muting Shuttle monitoringMonitoring Monitoring flowchart DA-88 and DA-38 Monitoring Monitoring tablesMonitoring Reference modes Setting the precisionSetting a relative time reference Location functionsReturn-to-zero ABS settingABS setting Selecting Time ModeAuto play Setting the location pre-roll valueLocation operations Location operationsRecalling a location memory Manual entry of a location pointEditing a location Storing the location in a memoryEditing a location memory Repeating a sectionRepeating a section Repeated entry of location pointsPunch operations Rehearsing the punch recording Setting pre-roll and post-roll timesCrossfade times Performing the punch recording Punch operations Track operations Making settings on the Dtrs unitsTrack delay Track operations Rec Mute function Key Mode Unit-related functions Unit-related functionsAuto Offset function Chasing with an offsetFrom menu group E, move the cursor to either Checking the offsetClock selection Output timingDither Varispeed pitch controlInput selection Word lengthSine oscillator Unit-related functions Confidence modeReference levels Meter modesN e O s c i l l a t o r C h i n e Unit-related functions Selecting the timecode source Timecode functionsPrimary timecode functions Primary timecode functionsSelecting a timecode type Setting the generator start timeStart the timecode source Checking the generator progressRecording the timecode on a Dtrs timecode track Rewind the tape to the beginningChasing with a timecode offset Chasing to external timecodeAuto Timecode Offset function Independent clock settingsAdvanced timecode functions Advanced timecode functionsPull up and pull down Error bypassRechase mode Synchronization of timecodeMidi 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 Location pre-roll on the serial unit Controlling the serial port 9-pinControlling the serial port 9-pin Selecting the serial port deviceUse the UP and Down keys to select between Split and Normal Split mode on the serial unitSerial unit timing source Controlling recording operations on the serial unitTrack mapping functions Other Dtrs control functionsOther Dtrs control functions Choosing a control protocolDevice emulation Recording delayTimecode track mapping Remote track armingCue-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 E Menu group aMenu group F Alphabetical list of menu items Alphabetical list of menu itemsDimensions SpecificationsSpecifications Dimensions Dtrs Index A-EABS 6-2,8-2 Index F-OIndex P-T Generator 8-1,8-2,10-5,10-6 Index U-ZRC-898
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