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A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). kHz is most commonly used in reference to radio frequencies and audio signal processing. The name kilocycle is an obsolete name for the same concept.

hectohertz << kilohertz << megahertz

  Results from FactBites:
1 kHz Oscillator (154 words)
The Vienna bridges 1 kHz Oscillator has distortion attenuation of at least 60 dB and a balanced and floating output with very low internal resistance.
The 1 kHz oscillator can thereby be used as a central level audio generator, because the level remains constant independent of the number of output feeds.
The 1 kHz oscillator has three outputs; output 1 always sends a signal when the switch OSC-ON is turned on, output 2 sends a signal if, in addition, the switch OUTPUT-ON is operated, and output 3 sends a -60dBu or -9dB/-3dBu adjusted signal.
There's life above 20 kilohertz! A survey of musical instrument spectra to 102.4 kHz (5177 words)
If the 50 kHz peak were found to be at the 0.1% level, that is, 60 dB below the 25 kHz peak, then it might be due to distortion—if the distortion were indeed as high as 0.1%.
After the convolution, the point at 20 kHz was indeed raised to -12 dB relative to the constant spectrum, but points at higher frequencies were at -150 dB, indistinguishable from the computation noise.
The grid-on and grid-off random-incidence responses of the BandK 4135 differ by 3 dB at 30 kHz, 4 dB at 40 kHz, 1½ dB at 50 kHz and presumably by substantial amounts at higher frequencies, where the calibration of one of the curves is not known (that is, not supplied by the manufacturer).
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