chirp(redirected from chirping)
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An undesirable variation in the frequency of a continuous-wave carrier when it is keyed.
The sound heard in a code receiver when the transmitted carrier frequency is increased linearly for the duration of a pulse code.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
chirped pulseA pulse in which the wavelength changes during the duration of the pulse. In a diode laser, chirp arises from direct modulation of the laser, because the refractive index changes with the electron density. The output of a laser may be chirped intentionally to create a high-powered, extremely short pulse. In this case, the initial pulse from an oscillator is stretched out using optics, amplified and then compressed back to its original duration.
CHRP(Common Hardware Reference Platform) A specification that was intended to make the PowerPC a standard platform. Also known as the PowerPC Reference Platform (PPCP), it defined minimum hardware requirements such as ports, sockets, bootstrap ROM and cache. Introduced in 1995, the first CHRP systems became available from Motorola in 1997. Since operating system support (OS/2, NT, Solaris and NetWare) for the PowerPC was halted, CHRP served mostly as a standard for Mac clones, which were short-lived. See Pegasos and Macintosh clone.
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