Technical Data
474-Add-on Modules
58
10.1.8 Analog Audio
Extender modules with the analog audio option support a bidirectional
stereo audio transmission, in near-CD quality
.
The
audio interface
is a 'line level' interface,
and it is designed to transmit the signals of a sound card (or another 'line
level' device) as well as to allow the connection of active speakers to the CON Unit.
Stereo audio can be transmitted bidirectionally at the same time.
Connection of a Microphone
Connect the microphone to the 'audio' input of the CON Unit. There are two ways to establish this connection:
•
Connect the output of the CPU Unit to the microphone input of the sound card (red).
Adjust the sound card to provide an additional amplification (20 dB).
•
Connect the output of the CPU Unit is connected to the audio input of the sound card (blue).
Choose this connection if the microphone has its own pre-amplifier.
The CON Unit can also provide pre-amplification of a microphone. To activate the pre-amplification.
Open the CON Unit.
Locate the pins marked with 'MICJP' on the audio board and close the pins with a jumper.
Specification Analog Audio
Parameter
Value
Transmission format
Digitized virtually CD quality audio (16 bit, 38.4 kHz)
Signal level
Line-Level (5 Volt Pk-Pk Maximum)
Input impedance
47 kOhm
Output impedance
270 kOhm
Connections CPU Unit 2x 3.5 mm stereo jack plug (audio IN & audio OUT)
Connections CON Unit 2x 3.5 mm stereo jack plug (audio IN & audio OUT)
Specification Analog Audio USB 2.0
Parameter
Value
Transmission Format
Digitized virtually CD quality audio, 16 bit (8/11,025/16/22,05/32/44,1/48 kHz)
Signal Level
Line-Level (0.43 Volt Pk-Pk maximum)
Input Impedance
20 kOhm
Connections CPU Unit 1x USB-B
Connections CON Unit 2x 3.5 mm stereo jack plug (audio IN & audio OUT)