The Ultimedia Services Audio Adapter has four back panel connections. These include Microphone, Line In, Line Out, and Headphone. Each of these connections is implemented using a 3.5 mm (1/8 inch) stereo mini jack. Guidelines and requirements for each of these connections follow.
Microphone |
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Note: Phantom power of .5 mA at 2 V DC for electret condenser microphones provided at both mini jack tip and ring.
Recommendations for microphone to be used with card:
Music applications: 20 Hz to 20 KHz, 3.5 dB, Speech applications: 50 Hz to 12 KHz, 5 dB
Suggested office speech microphone:
2 V RMS (Input impedance: 30 K ohms typical).
2 V RMS into 10 K ohms minimum.
The adapter provides two auxiliary input connectors. The first connector accepts 1 volt RMS nominal at an impedance of 50 K ohms, and it can be connected to a CD-ROM drive. The second auxiliary input connector is reserved for system use.
A mono microphone can be used to provide input to the mixer implemented on the adapter. The adapter also drives mono output to the Micro Channel audio summing node.