HP HEWLET VECTRA VA 6/XXX manual Humming Noise

3 Troubleshooting Your PC

If Your PC Has an Audio Problem

Audio Input from the Microphone is Too Low, or No Audio At All

Humming Noise

Check that the microphone specifications meet the requirements of the 16-bit sound components. The microphone should be a 600-ohm dynamic type.

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

The PC Hangs While Recording

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.

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.

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