(FH, FHSS) A variation of spread spectrum communications in which a sequence of pseudo random numbers control a frequency synthesizer, generating different carrier frequencies that “hop around” in the desired frequency range. The receiver tunes to the same sequence of carrier frequencies in synchronisation with the transmitter.
Frequency hopping spread spectrum was invented by Hedy Lamarr (“the most beautiful girl in the world”, Samson and Delilah etc.) and the composer George Antheil. They held a patent filed in 1942.
noun, Electronics, Radio. 1. . noun 1. a method of transmitting information using a radio-frequency carrier wave. The frequency of the carrier wave is varied in accordance with the amplitude and polarity of the input signal, the amplitude of the carrier remaining unchanged FM Compare amplitude modulation frequency modulation A method of transmitting signals, especially […]
noun, Statistics. 1. a frequency curve consisting of connected line segments formed by joining the midpoints of the upper edges of the rectangles in a histogram whose class intervals are of uniform length.
noun, Electronics. 1. the effectiveness with which a circuit, device, or system processes and transmits signals fed into it, as a function of the signal frequency. 2. Also called frequency-response curve. a graph of frequency response, with signal amplitude or gain plotted against frequency.
- Frequency shift keying
communications (FSK) The use of frequency modulation to transmit digital data, i.e. two different carrier frequencies are used to represent zero and one. FSK was originally used to transmit teleprinter messages by radio (RTTY) but can be used for most other types of radio and land-line digital telegraphy. More than two frequencies can be used […]