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3 Troubleshooting Your PC
If Your PC Has an Audio Problem
46 English
Audio Input from the
Microphone is Too Low,
or No Audio At All
Check that the microphone specifications meet the requirements of the
16-bit sound components. The microphone should be a 600-ohm
dynamic type.
Humming Noise If the power grounding of your audio components is inadequate, a
humming noise may be generated. This may happen if your PC is
connected to a hifi system. Plug all devices into adjacent power outlets
(outlets within 5 cm / 2 inches of each other), or use line filters.
Occasional Crackles
When Playing Back
Sounds
These crackles are usually the result of your PC being unable to transfer
audio samples within the required time. A solution is to use a lower
sampling rate. Recording and playing back at 22 kHz is less demanding
upon system resources than recording audio at 44 kHz.
The PC Hangs While
Recording
Uncompressed digital audio can eventually fill your hard disk. For
example, one minute of stereo sound recorded at a resolution of 44 kHz
will occupy about 10.5 MB. Before recording, check that there is enough
free space on your hard disk.
Data compression can reduce the space required. The A-law and µ-law
hardware compression used by the audio interface enables the
sampling of sound at a resolution of 16-bits, but it generates the same
quantity of data as an 8-bit sample.
cobra-m3.fb4 Page 46 Wednesday, May 15, 1996 3:31 PM