Instruction manual

Genesis MP Appendix A
◆ 71
Sound Input Jack
The Genesis MP stereo sound input jack is for connecting an
external microphone or a line-level source. The computer provides
sound digitization and recording with 16-bit samples at sample
rates of up to 44.1 KHz and supports Apple Computer’s speech
synthesis and recognition software.
The sound input jack is a stereo mini-phone jack with an additional
contact to supply power to an Apple microphone. The sound input
jack accepts either the Apple PlainTalk line-level microphone or a
pair of line-level signals by way of a separate adapter.
The sound input jack has the following electrical characteristics:
• Input impedance: 8000 W
• Maximum level: 2 V rms
• Maximum gain: 22.5 dB
• Signal-to-noise ratio: 82 dB
Note:
The Apple PlainTalk microphone requires power from the main com-
puter, which it obtains by way of an extra-long, 4-conductor plug that
makes contact with a 5-volt pin inside the sound input jack.
Sound Output Jack
The Genesis MP stereo sound output jack is for connecting exter-
nal powered speakers or other line-level devices. The sound out-
put jack is a stereo mini-phone jack. Inserting a plug into the jack
disconnects the internal speaker.
The sound output jack is a standard mini-phone jack; it has the fol-
lowing electrical characteristics:
• Output impedance: 37 W
• Maximum level: 0.9 V rms
• Maximum attenuation: 22.5 dB
• Frequency response: 20 Hz to 20 kHz, plus or minus 2 dB
• Harmonic distortion plus noise: less than 0.05 percent at 1 V
rms input
• Signal to noise ratio: 85 dB; no audible discrete tones
Note:
Crosstalk degrades from –80 dB to –32 dB when 32 Ω head-
phones are connected.
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