HP Model 745 - VME Workstation, Owner'S Manual, Page: 40 / 220

2-8
Connecting Cables
Audio Connection
Audio Connection
The Model 745 provides audio input and output in stereo with a 16-bit
coder-decoder (CODEC) over a frequency range of 25-20,000 Hz. Output is
provided by a small internal speaker and a stereo headphone mini-plug (8
ohms impedance). Input is provided by a stereo line-in and mono micro-
phone mini-plugs.
The CODEC combines stereo A/D converters for microphone and line input
levels. D/A converters for driving headset and line outputs are used. The
input sampling rate and format are programmable, as are the input gain con-
trol (used for software control of recording levels) and output attenuation.
A
1
/
8
-inch mini-jack is used for the speaker out connection. The other audio
signals are on a 9-pin micro D-sub connector. The output is capable of driv-
ing 8 ohms; it can also be used for higher impedance devices with little or no
additional distortion. A line-level input can be driven by the headset output.