Lexicon 20/20 AD manual Synchronization Output Formatting, Alternate Modes

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Controls and Connectors

Lexicon

 

Synchronization

and

Output Formatting

DITHER

Selects the type of dither: wide bandwidth, 20 bit, or High Frequency .

FORMAT

Selects the format to be available at the output con- nectors, AES or S/PDIF.

DITHER

WIDE

20 BIT

 

 

HF

PL DN

SAMPLE RATE

 

48

44.1

FORMAT

 

 

AES

SPDIF

EXT SYNC

 

WC

AES

 

 

AES / WC:

PRES

LOCK

 

SAMPLE RATE

Selects the sample rate of the A/D conversion. This switch should be set to the same sample rate as your sync source. When Word Clock is selected as an exter- nal sync source, the AES Channel Status Sample Rate

Note: The format selected here will be sent to all out- puts.

AES/WC

In internal sync mode, PRES indicates that either WC or AES is available at the inputs as a sync source.

In external sync mode, PRES indicates that the selected sync source is present at the input connectors.

LOCK lights in external sync mode to indicate the unit has successfully locked to the in- coming signal (WC or AES).

bit will be set to the sample rate value you have selected here.

(The PL DN setting of this switch is reserved for future enhancements.)

EXT SYNC

This switch allows selection of: Internal mode (unlit), Word Clock source, or AES source.

Alternate Modes

To activate

the alternate modes...

press and hold

...then press one of these.

    

          

1dB SCALE

ATTEN

 

 

DISPLAY DITHER

ALT

MUTE

RMT

 

~ 4 CHAN

 

 

LINK

 

 

 

ON

 

 

 

 

 

 

 

Repeat to exit the alternate mode. VID

ALT - ATTEN

Mutes the outputs. Note that the level meters still work. To unmute, hold ALT and press ATTEN again.

ALT - 4 CHAN

Activates output of a digital sinewave at the AES ports.

ALT - DISPLAY

Activates remote mode/front panel lockout. When acti- vated, the 1dB SCALE and DISPLAY LEDs flash and front panel controls are locked into their current set- tings. To unlock, hold ALT and press DISPLAY again.

ALT - LINK

Only active in 4-channel mode. Activates a short tone burst. See Realigning Two DAT Recordings.

ALT - ON

Reserved for future en- hancements.

ALT - DITHER

Activates psychoacousti- cally optimized noise shap- ing. When activated, WIDE, 20BIT and HF will be lighted.

Note that this type of dither can only be used in 2-chan- nel mode; activating will dis- able 4-channel mode and compressor functions.

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Contents 20/20 AD Precautions Electrostatic Discharge ESD Precautions Contents AES/EBU Interface Professional IntroductionPower Mounting Controls and ConnectorsConverter 20/20 AD Front Panel ControlsCompressor Level MetersDisplay LinkSynchronization Output Formatting Alternate ModesPress and hold Then press one of these BAL/UNBAL 20/20 AD Rear Panel ConnectorsConnectors Audio ConnectionsXLR Pinout Cables Signal Type Attenuator DBu DBV Signal Type Pin Pin3Termination and Grounding via Internal Jumpers Word Clock These instructions are for use by qualified personnel onlyAnalog Jumpers Balanced Unbalanced Input Signals Front panel Adjustments DB ScaleMeter Ballistics AES Sync Word Clock Synchronization and Sample RateInternal and External modes StatesPsychoacoustically Optimized Noise Shaping Pons About Dither00k 10.0k 12.0k 14.0k 16.0k 18.0k Dynamic Range Compression Automatic Offset Removal Compressor ModesInput Gain Threshold Release Compressor Knob ValuesTransfer Functions Non-linearUsing the 20/20 AD Lexicon Link Realigning Two DAT Recordings Digital Sinewave GeneratorGain Definition of Terms Definition of Terms Oak Park Bedford, MA 01730 USA Tel Fax