Search results
Results from the WOW.Com Content Network
Radio jamming is the deliberate blocking of or interference with wireless communications. [1] [2] In some cases, jammers work by the transmission of radio signals that disrupt telecommunications by decreasing the signal-to-noise ratio. [3] The concept can be used in wireless data networks to disrupt information flow. [4]
Example of a mobile phone jammer, produced by Jammerspro. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting ...
With an individual who does not stutter, auditory feedback speech sounds are directed to the inner ear with a 0.001 second delay. [11] In delayed auditory feedback, the delay is artificially disrupted. Studies have found that in children ages 4–6 there is less disturbance of speech than in children ages 7–9 under a delay of 200 ms. [12]
The near–far problem or hearability problem is the effect of a strong signal from a near signal source in making it hard for a receiver to hear a weaker signal from a further source due to adjacent-channel interference, co-channel interference, distortion, capture effect, dynamic range limitation, or the like.
Estonia has accused neighbouring Russia of jamming GPS navigation devices in airspace above the Baltic states, echoing concerns from airlines that say they have been contending with such ...
In 1942, actress Hedy Lamarr and composer George Antheil received U.S. patent 2,292,387 for their "Secret Communications System", [9] [10] an early version of frequency hopping using a piano-roll to switch among 88 frequencies to make radio-guided torpedoes harder for enemies to detect or jam. They then donated the patent to the U.S. Navy. [11]
Jamming (knot), the tendency of knots to become difficult to untie; Interfering with communications or surveillance: Radio jamming; Radar jamming and deception; Mobile phone jammer; Echolocation jamming; Radio-controlled improvised explosive device jamming, a counter-IED technique; Jamming (physics), an apparent change of physical state
Friendly-jamming schemes (DFJ and OFJ) are models that can decrease the eavesdropping risk by purposely interfering the network when an unknown user is near the area of the protected area. [ 1 ] [ 19 ] The models are tested by the probability of eavesdrop attacks in a testing environment, and are found that there is a lower probability of ...