HP 744 User Manual download pdf (Page 89)

4-9

Connecting Cables

Audio Connection

Model 744 Board Computers provide compact disc-quality 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 ste-

reo line-in and mono microphone mini-plugs.

The CODEC combines CD quality 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 control (used for software control of recording levels) and output atten-

uation.

-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.

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HP 744 User Manual Page 89