1) A measure of the frequency of a sound. One KHz (or kilohertz) is equal to 1,000 cycles per second. The higher the number, the higher pitched the sound. Normal speech has a very limited frequency range - mostly between 300Hz and 2.4KHz. Music and other sounds can be heard at far higher and lower frequencies. 2) You will also see KHz mentioned in the specification of a soundcard. This can define two separate functions. The first is the range of frequencies the soundcard can output. The second is the frequency at which the soundcard takes samples of a sound when recording it on to your disk. A soundcard looks at the level of a sound thousands of times each second and so builds up a picture of it. The more times it takes a sample, the more accurate the recording. The number of times the soundcard takes a sample per second is described in KHz. A good soundcard should cope with 22KHz or 44KHz samples.
