Link electronic Portable Generator 812 OP E User Manual

A PRODUCT OF THE GENFLEX SYSTEM  
LINK ELECTRONICS, INC.  
AES ANALOG TONE GENERATOR  
812-OP/E  
For Future Generations  
The GenFlex 812-OP/E is a high performance 24  
bit digital and analog audio generator. The 812-  
OP/E is a single module for use with the SPG-812  
GenFlex frame. This unit is designed to perform  
two basic functions. The first basic function of this  
module is to produce a single AES/EBU digital  
audio signal for use as a digital audio reference or  
digital tone source. Second, it is to produce a  
balanced stereo analog audio signal of up to  
+28dBu for use as a test tone.  
The level of the analog audio tone can be adjusted  
in 2dB increments in reference to the digital audio  
with internal rotary switches. This generator runs  
at the professional sample rate frequency of  
48kHz. LEDs are used to indicate tone frequency  
and level, digital silence, lock status, and power  
indication. Further, the user has control of some of  
the user status bits through dip switches on the  
module.  
Internally, the creation of the audio tone is done  
with a 24 bit audio “wave table” stored in ROM.  
The output from the ROM is formatted and output  
as digital audio. The analog output is created by  
digital to analog conversion. This is done with a  
high performance one-bit delta-sigma DAC with a  
128x oversampled forth-order modulator.  
The generator has a set of features designed to  
make it fit into a wide variety of applications.  
These features include genlocking of the audio to  
digital or analog video within the Genflex frame.  
Also, the user may select to have this module free  
run with its high stability oscillator.  
The user may select the amplitude and frequency  
of the audio tone from a fixed set of 8  
combinations. Within this set of eight there are  
three frequencies (1KHz, 400Hz, 60Hz) and three  
levels (0dBFS, -10dBFS, -20dBFS)*. With this, the  
module has the ability to produce “digital silence”  
while producing one of the eight combinational  
tones on the output.  
The GenFlex audio generator is built with quality  
throughout the unit. The analog audio signal path  
consists of surface mount thick film resistors to  
achieve low noise and high quality audio  
characteristics. Further, with its ability to produce  
24 bit digital audio, it can produce the highest  
resolution audio available in the AES3 format. The  
812-OP/E is an addition to Link’s GenFlex family of  
analog/digital generator products. It is designed to  
reside in LINK's SPG-812 frame in the audio slot  
with a possible total of five other video modules.  
There are two digital outputs, one conforming with  
the AES3-ID interconnection standard and the  
other with AES3-1992 interconnection standard.  
The analog output consists of screw-type terminal  
block connections for balanced stereo audio.  
* 60Hz tone has 2 levels (0dBFS and -20dBFS).  
The other tones have three levels.  
LINK  
ELECTRONICS, INC. 2137 Rust Avenue Cape Girardeau, MO 63703-7668  
Phone 573 334 4433 FAX 573 334 9255  
 

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