an audible tone
41Classical fencing — is the styles of modern fencing as they existed during the 19th and early 20th century. According to the 19th century fencing master Louis Rondelle, A classical fencer is supposed to be one who observes a fine position, whose attacks are fully… …
42Logic probe — A logic probe is a hand held pen like test probe used for analyzing and troubleshooting the logical states (Boolean 0 or 1) of a digital circuit. While most are powered by the circuit under test, some devices use batteries. They can be used on… …
43Tikker — A tikker was a device that allowed early crystal radio circuits to detect continuous wave telegraphy. Ordinary crystal detectors cannot demodulate continuous waves; the direct current (DC) signal is inaudible in headphones.[1] One form of the… …
44Speaker grille — A speaker grille (or speaker grill) is usually found in front of many consumer and industrial loudspeakers, and consists of either a hard or soft / mounted directly over the face of the speaker driver. Its main purpose is to protect the driver… …
45rocket and missile system — ▪ weapons system Introduction any of a variety of weapons systems that deliver explosive warheads to their targets by means of rocket propulsion. Rocket is a general term used broadly to describe a variety of jet propelled missiles… …
46Missile lock-on — For other uses, see Lock On (disambiguation). Missile lock on refers to a scenario where the guidance system for a missile (or its associated launch vehicle) can accurately track a target, and a fire control system can calculate the required… …
47loudly — adv. with a great noise, in a very audible tone, clamorously, noisily; in poor taste, garishly; offensively …
48unvocalised sound — sound that is not vocal, sound that does not have an audible tone …
49whisper — v. & n. v. 1 a intr. speak very softly without vibration of the vocal cords. b intr. & tr. talk or say in a barely audible tone or in a secret or confidential way. 2 intr. speak privately or conspiratorially. 3 intr. (of leaves, wind, or water)… …
50Absolute threshold of hearing — The absolute threshold of hearing (ATH) is the minimum sound level of a pure tone that an average ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the… …
