FRAC; Fracastoro; Fraccaro; Fraccaro, M. FRACDS; FRACGP; fracidin; FRACO; FRACOG; FRACP; FRACR; FRACS; fract-fract dos; Fractal; fractals; fraction; fraction collector; fraction of inspired oxygen; fractional; fractional dilation and curettage; fractional distillation; fractional excretion of sodium; fractional flow reserve; fractional injection; fractional oxyhemoglobin
In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. carrier squelch is unlocked and will let any signal in. Selective calling locks out all signals except ones with the correct code. In non-critical uses, selective calling can also be used to hide the presence of interfering signals such as receiver-produced intermodulation.
Continuous Digital Coded Squelch System (CDCSS), Digital Private Lineâ¢ (DPLâ¢), Digital Channel Guardâ¢ (DCGâ¢), etc. The Continuous Digital Coded Squelch System (CDCSS), was the follow-on to CTCSS (but some books use Code instead of Coded in the name). Instead of a constant low frequency tone, CDCSS superimposes a continuous repeating data or code stream of 23-bit square wave digital data words on the transmitted signal at a bit rate of 134.4 bits per second (with a tolerance of + or - 0.4 bps).